More recently, when choosing fuel for almost any boiler, gas has always been preferred, and solid species remained in second place. But technological progress does not stand still, and modern technologies allow the qualitative use of any type of fuel, including solid fuel. For this, special pyrolysis boilers have been developed.

Heat generation process

The heating unit works on the principle based on pyrolysis. So, in the process of smoldering, the fuel decays into two components: coal and gas. Slow combustion is ensured by limiting the air supply in the furnace. The decomposition products in the form of gas are captured to participate in further thermal processes.

Pyrolysis gas is diluted with air and burned at higher temperatures. As a result of this interaction, heat is released.

fuel requirements

Depending on the quality of the fuel that is burned, the type of heating equipment is determined.

There are two types of pyrolysis ovens:

• non-volatile;
• waste disposers.

They differ among themselves in the quality of the fuel that they burn.

For them, it is necessary to use fuel with a minimum moisture content. This will ensure a long service life. The maximum value must not exceed 25%.

The use of high-quality wood allows you to get 4 kW / h with smoldering 1 kg of fuel. This is a great option for home heating.

Pyrolysis plants of this type are not too picky about fuel. Peat, and wood waste, as well as low-quality grades of coal can be used. The requirements for humidity are not as high as in the previous version - humidity up to 50% is allowed.

But raw wood (waste) reduces power by 2 times. This is due to the fact that wet fuel burns poorly and emits a lot of smoke.

Types of fuel used

Wood and its waste can be used in various forms:

• bars with dimensions 250 × 450;
• sawdust of various sizes;
• briquettes formed from the remnants of processing.

Firewood is produced mainly from hardwood, but softwood is also used. In addition to wood, various types of coal can be used. The choice of fuel depends on the time of its combustion. This indicator has different meanings:

• black coal - 10 hours;
• brown concentrate - up to 8 hours;
• soft wood - 5 hours;
• solid wood - 6 hours.

The device of gas generators

A characteristic feature of the design is the presence of two chambers in the furnace. The upper chamber is designed for loading firewood and the primary smoldering process. In the lower chamber, a mixture of gases is burned and heat is released. They are separated from each other by a gasification nozzle. Most often it is made of refractory concrete. The firebox is the main element, but in addition to it, the following components are also provided in the design:

• smoke exhauster;
• pipes and chimney pipes;
• water supply and output system;
• various regulators;
• frame.

The designs of the boilers may be different, but they do not have significant differences in the principle of operation. It is indicated by several operations:

1. the combustion mode is set;
2. fuel is ignited;
3. the required temperature in the furnace is reached;
4. the supply of oxygen is limited, and the regulator is switched to the smoldering mode, during which pyrolysis gas is formed;
5. then it enters the nozzle, where it is mixed with air;
6. the resulting gas mixture is distilled into the lower chamber, where it is burned and heat is released, which is spent on heating the house.

The entire operating cycle of the heat generator can be determined by two main stages:

• formation of gas in the loading chamber at a temperature of 200–800 ºС;
• combustion of the pyrolysis gas mixture in the combustion chamber when heated to 1200 ºС.

The heat released during the process heats the air. The use of the pyrolysis mechanism puts the gas generator a step above the direct combustion wood boiler.

Launch Process

If the boiler is working properly, the burning flame will be yellowish white. To achieve this, it is necessary to start the equipment correctly: before laying coal or other fuel, the loading chamber should be heated to a temperature of 600-800ºС.

After loading the fuel, it ignites, and now you can switch the equipment to the pyrolysis cycle. It is also necessary to turn on the additional traction provided by the smoke exhauster. By adhering to simple rules, it is possible to ensure a slow oxygen-free combustion of coal with a useful release of heat.

Advantages

The entire process of combustion and heat generation is automated, in contrast to direct combustion furnaces. Also, the equipment allows you to adjust the power in the range of 50-100%. In addition to these parameters, their operation is associated with a number of advantages:

• regular cleaning of soot and ash is not required, because the fuel burns out almost completely;
• quick warming up of the house - an increase in temperature by 20ºС occurs in half an hour;
• fuel economy due to the increased combustion cycle of one bookmark;
• efficiency, depending on the model, is 80–85%;
• safety, simplicity and ease of use.

In the absence of access to the gas main, pyrolysis solid fuel boilers are the best option for heating equipment.

Disadvantages of using gas generators

A long list of advantages can be a little overshadowed by a number of disadvantages. Before you opt for such a heating unit, you should also study the disadvantages:

• high requirements for the wood used as a type of fuel;
• lack of automated loading mode;
• the use of forced traction requires the consumption of electricity, and these are additional costs;
• the inability to heat water, which is due to the fact that all models provide only a single-circuit system;
• high price.

Application area

Long-burning pyrolysis boilers are used both in civil and industrial premises. If we are talking about large areas, the choice of such a heat source will be the best option. Installing a generator in a small house is impractical and does not justify itself.

The main problem of solid fuel stoves has always been the emission of smoke and gas. In addition to the smell, toxic fumes also got into the air. The pyrolysis process solved this problem by completely burning the fuel, so the side effects are kept to a minimum.

The environmental factor is becoming more and more priority when choosing a heating source. Very often, furnaces are used in woodworking and light industry enterprises. With their help, waste is disposed of, and enough heat is generated to heat the house.

Pyrolysis boilers are becoming more and more popular every year when installing a heating system. Although they have several drawbacks, parameters such as high efficiency and environmental friendliness fully compensate for them. Gas generators have a high cost, which is 1.5 times higher than the classic version. But they will pay off in the shortest possible time by reducing fuel consumption.

1. Scheme and arrangement of the pyrolysis combustion boiler
2. The principle of operation of the pyrolysis heating device
3. Advantages and disadvantages of pyrolysis boilers
4. Installation and installation of pyrolysis boilers

Each owner of a private house, choosing a solid fuel heating boiler, undoubtedly wants to make the best choice. One of the main criteria that all buyers, without exception, pay attention to is profitability. Among the whole variety of devices on the Russian market, there is one variety that uses a special method of burning it - long-burning pyrolysis boilers. Let's try to figure out how such a boiler works and how it works, and also consider its main pros and cons.

Scheme and arrangement of the pyrolysis combustion boiler

The essence of pyrolysis can be explained using the example of a long-burning wood-burning boiler. Under the influence of high temperatures in the furnace (about 450 degrees Celsius), the wood decomposes into a solid and gaseous component. Subsequently, each of these components is burned separately. Heating devices of this type are also called gas generators, and the method itself is called the dry distillation method. Thanks to this technology, better efficiency and lower consumption of firewood are achieved than when using the classical method, but the price of the device increases significantly.

The main types of fuel for long-burning boilers using the pyrolysis method are: wood, coal, peat, sawdust, pellets. The main fuel requirements are as follows:

• limited dimensions

  The dimensions of the bookmark should not be larger than the size of the firebox. In the case of wood logs, their length is usually limited to 40cm and diameter to 20cm.

• low humidity

  To obtain high efficiency, as well as to extend the life of the boiler, it is necessary that the moisture content of the fuel used in it does not exceed 20%.

According to the type of fuel used, all types of pyrolysis boilers can be divided into:

• wood-burning

  Structurally, designed to work on wood. It is on this fuel that they give the best efficiency. The most famous model of this type is

• coal

  The main type of fuel is brown coal or coke.

• pellet

  Such boilers work on pellets - pressed fuel pellets from woodworking waste.

• combined (or universal)

  They can operate on any of the above types of fuel. The efficiency of universal long-burning boilers is usually worse than those designed for a specific type of fuel.

Depending on how many contours the design contains, they distinguish:

• single-loop

  The hot water boiler contains one circuit, which is used to heat the house.

• double-circuit

  The design provides an additional circuit to provide hot water.

Below is a diagram of a pyrolysis boiler, looking at which we will analyze its device. A domestic long-burning heating boiler usually consists of the following main elements:

• Control device

  The automatic control unit for the boiler is designed to set various operating modes of the boiler. This device allows you to control various parameters of the heater.

• Frame

  The outer frame is made of steel and coated with a special heat-resistant and wear-resistant paint. The use of special paints in heating boilers is dictated by the conditions of their operation and temperature conditions.

• thermal insulation

  To reduce the heat loss of the pyrolysis boiler, it is thermally insulated. As materials for thermal insulation, mullite-silica slabs, asbestos, diatomite, and lime are used.

• Boiler boil device

  This device allows you to keep the temperature of the boiler within the required limits. Boiling the boiler is very dangerous and can lead to the failure of the boiler, and in some cases to an explosion.

• heat exchanger

  The heat exchanger is a cast-iron or steel container, which is filled with a coolant. In its upper and lower parts, valves are equipped for connecting the supply and return lines of the heating system. During combustion, the coolant inside the heat exchanger heats up and circulates through the heating system.

• Loading chamber

  The loading chamber (gasification or furnace) is a compartment into which solid fuel is loaded. After loading and ignition of fuel, the supply of primary air is reduced. The combustion process slows down and the fuel begins to slowly smolder, releasing pyrolysis gas. The temperature at which this procedure takes place is approximately 450C. The resulting gaseous mixture is injected into the next compartment, called the combustion chamber.

• The combustion chamber

  In the combustion chamber, a mixture of wood gas and secondary air is burned. The supply of this mixture is carried out forcibly from the gasification compartment. The combustion process takes place at a temperature of 1100C.

• Supply line connection

  The supply pipe is used to supply hot water from the boiler to the heating system.

• grate

  The grate is a cast-iron or steel grate located between the loading and combustion chambers. Gasification of solid fuel takes place on it, and pyrolysis gas is also injected through the holes in it into the combustion chamber located below.

• Chimney pipe

  The flue represents the channel for removal of gaseous products of combustion. The length and section of the chimney must depend on the capacity of the boiler.

• Chimney Fan

  Since most use top blowing, it is necessary to use forced draft with a fan or a smoke exhauster.

• Primary air valve

  Primary air is designed to preheat the fuel and start the pyrolysis process.

• Secondary air valve

  Secondary air is necessary for the afterburning of pyrolysis gases in the combustion chamber.

• Return line connection

  Through the return pipe, the coolant from the heating system returns back to the heater.

The principle of operation of the pyrolysis heating device

So, how does a pyrolysis boiler work? Let's look at the step-by-step scheme of its operation using the example of a pyrolysis boiler on coal:

Stage 1:

Solid fuel is loaded into the furnace, in our case coal. The boiler is ignited and the door to the combustion chamber closes tightly. Since the supply of primary air is limited, the process of smoldering and the release of pyrolysis gas begins. The duration of burning can be controlled by adjusting the supply of primary air.

Stage 2:

A mixture of pyrolysis gas and primary air is forced into the combustion chamber through the holes in the grate. Secondary air is also supplied there to ensure the intensity of combustion. There is a process of burning a mixture of pyrolysis gas and secondary air at a high temperature. The resulting thermal energy heats the coolant inside the heat exchanger.

Stage 3:

Through the gas duct, by means of forced draft with the help of a smoke exhauster, the gaseous products of combustion are discharged into the atmosphere. It should be especially noted that the exhaust gases formed as a result of pyrolysis combustion contain a minimum amount of harmful impurities. Most of the flue gases are water vapor and carbon dioxide.

As you can see, the principle of operation of the pyrolysis boiler is somewhat more complicated than the traditional one. That is why their cost is usually 2 times higher. Before deciding which pyrolysis or classic boiler to buy, let's look at the pros and cons of pyrolysis combustion boilers.

Advantages and disadvantages of pyrolysis boilers

The use of pyrolysis technology has both advantages and disadvantages. The main advantages of pyrolysis-type long-burning boilers are:

• Burning time

• Increased economy

  When using pyrolysis combustion, solid fuel burns out much better. To obtain the same amount of heat when using pyrolysis, less fuel is required than with traditional combustion.

• High efficiency

  The efficiency when using pyrolysis is much higher. The range of efficiency values ​​for pyrolysis boilers is 85-92%.

• Environmental friendliness

  In the composition of the gases at the outlet of the pyrolysis type boiler, harmful impurities are almost completely absent. The main part of the exhaust gases are water vapor and carbon dioxide.

• Possibility of adjustment

  The process of gas generation is easily adjustable. Therefore, most often pyrolysis boilers are automatic. Adjusting the intensity of combustion allows you to adapt to the needs of the heating system.

In addition to the advantages we have considered, they also have a number of disadvantages. Let's take a closer look at them:

• Energy dependence

  The design feature of the pyrolysis boiler is that the supply of primary and secondary air, as well as draft, is carried out forcibly using fans that require electricity. However, there are also non-volatile natural draft models, but they are quite rare.

• Requires low humidity crowd

  The method of gas generation is very whimsical to the moisture content in solid fuel. The drier the fuel used, the better. Recommended humidity no more than 20%

• Full download required

  With a small amount of fuel, pyrolysis boilers begin to burn unstably. Therefore, it is recommended not to load less than 30-50% of the manufacturer's recommended rate.

• The complexity of automatic fuel supply

  For wood pyrolysis boilers, it is difficult to organize automatic fuel supply due to the large size of the logs. It is possible to make an automatic long-burning coal boiler only if the size of the coal fractions is uniform.

• High price

  The high cost of long-burning gas-generating boilers is one of their most significant disadvantages. Buying such a boiler can be 1.5-2 times more expensive than devices of similar power, but using the traditional method of combustion.

For more information about pyrolysis type heaters, their advantages and disadvantages, see the video:

It is worth noting the following advantages:

• automatically adjustable power;
• maximum efficiency and productivity;
• Ease of use;
• many years of operation.

Prices for long-burning solid fuel pyrolysis boilers primarily depend on the policy of manufacturers, as well as the situation on the foreign exchange market.

Solid fuel gas-fired boilers

When using gas-fired boilers for wood, solid fuel must meet certain requirements. First of all, we are talking about the presence of a large amount of light substances in the composition and the absence of high humidity (no more than 30%). For boilers with a similar mechanism of operation, the following fuel options are suitable:

• wood or firewood, the dimensions of which allow them to be easily loaded into the device;
• woodworking waste, shavings;
• briquettes from pressed wood dust;
• biofuel pellets;
• coal or coke;
• brown coal and so on.

In other words, this heating equipment is capable of using a large number of different types of fuel, which makes such a purchase quite versatile, since you can easily use such equipment in any region of the country.

The price of a long-burning solid fuel pyrolysis boiler also primarily depends on the rated power of a particular model. The choice of a suitable option depends on the quadrature of the heated room, as well as the characteristics of the climate, the thermal insulation of the room.

You can also buy a pyrolysis boiler in St. Petersburg at the company's representative offices, the contact details of which you can easily find on the website.

Long-burning pyrolysis boilers with a water circuit

Using a long-burning pyrolysis boiler with a water circuit for heating, you can also provide your home with hot water.

Pyrolysis boilers in our online store are represented by both domestic samples and imported models. The final choice depends entirely on your individual preferences.

The price of a wood-fired pyrolysis boiler in the Tekhnodom online store is distinguished by its objectivity, the absence of unreasonable trade margins. You will find all the necessary information about a particular model in our catalog, which contains detailed descriptions, specifications and photographs.

In our catalog you can buy a solid fuel gas-fired boiler in 1 click. If you still have specific questions regarding the features of using the models of heating equipment you are interested in, call the indicated numbers and you will receive comprehensive answers to your questions.

Each of us wants his home to be warm and comfortable. But this cannot be achieved without good heating.

There are many ways to warm up a room. Each of them has both its advantages and disadvantages. One of the most common and popular heating devices are pyrolysis solid fuel boilers for long burning.

They are widely represented in the market of heating devices and are in considerable demand. There are a large number of brands and models of domestic and foreign designs, which differ among themselves, mainly in performance and cost. (You can read an overview of modern pyrolysis boilers).

In addition, as the reviews of solid fuel owners show, often domestic brands are superior to foreign ones in terms of performance, reliability and durability, but at the same time their price is much lower.

Device and principle of operation

Pyrolysis boiler device. (Click to enlarge)

The main difference between long-burning pyrolysis boilers and conventional furnaces and direct-burning boilers is that after igniting the fuel, you should wait until its entire volume lights up, and the boiler switches to operating mode and air access becomes much less.

For this reason, only a small part of the fuel will burn. The heat that is released is sufficient for the gradual decomposition of the rest of the fuel and the release of pyrolysis gas. By the way, this one can be made by hand. (Read about the independent manufacture of a pyrolysis boiler).

Keep in mind: for self-manufacturing, you will need not only all the necessary components, but also practical experience, tools, skills and a detailed drawing. But, as experience shows, the easiest way is to purchase a finished product.

Fuel types

Aspen eurofirewood

One of the most positive properties of pyrolysis boilers is that they are able to operate efficiently on any solid fuel.

It can be black and brown coal, as well as wood and peat, etc.

Of course, on each of these types of fuel, the pyrolysis boiler is able to operate for a certain time until the moment when it burns out completely.

The combustion times for different fuels are as follows:

• brown coal - 8 hours;
• hardwood - 6 hours;
• soft wood - 5 hours;
• black coal - 10 hours.

As observations show, dry wood is the most effective. It, with a length of 45-65 centimeters, allows the boiler to function most efficiently and increase its operation time.

But if these types of fuel are not available, any type of fossil fuel can be used.

Of course, if it is allowed for use in such a boiler.

Permitted fuels include:

• briquettes and pellets for heating;
• wood waste;
• industrial waste containing cellulose;
• some varieties of peat.

When heating, it must be taken into account that if the flow rate of primary and secondary air is selected correctly, and the humidity of the air is not higher than the permissible one, then no by-products will be released during combustion.

Be careful: if the humidity is high, then the release of strong water vapor is inevitable, which means that tar and soot will inevitably appear, the calorific characteristics of the gas will deteriorate and the boiler may die out.

Varieties

Top chamber pyrolysis boiler

The main difference between these boilers is the location of the afterburner compartment. It can be above or below. There are many factors to consider when choosing a boiler. You can purchase, for example, a cast-iron boiler or a double-circuit one. It all depends on what area it will heat.

Boilers with a chamber at the top. They are the most popular, convenient and easy to use. This is due to the fact that the fuel is in the upper chamber, and the exhaust gas is removed through the pipe, which is located below.

But there is also a drawback - this type of boiler will have to be regularly cleaned of ash, as the ash enters the afterburner compartment.

Boilers with a chamber below. Despite the fact that boilers with this design are less common and convenient, they have some advantages. First of all, it is a rare need to clean the ash, because it does not enter the afterburner compartment. Also, the emitted gas rises and immediately, with the help of a nozzle, enters the chimney, where it cools. Thanks to this, there is no need to use a large amount of materials for the construction of the chimney.

Pros and cons of operation

According to numerous reviews of the owners of pyrolysis solid fuel boilers, they have the following advantages:

1. Due to the fact that the fuel is burned in two stages, there is a significant increase in efficiency.
2. The burning time is approximately three times longer than in a conventional oven and is approximately 12 hours.
3. Almost complete absence of waste, since the fuel burns out completely, and it is not necessary to clean the boilers too often.
4. It is possible to use not only chopped, but also non-chopped logs for heating.
5. When installing a pyrolysis boiler, there is no need for a significant change in the heating system.
6. The boiler is highly environmentally friendly.

Disadvantages of a pyrolysis solid fuel boiler:

1. For the operation of the boiler, electricity is required, since a fan must be installed for the smoke exhauster.
2. High price.
3. The moisture content of firewood should not exceed 25%.
4. The high load must be constant and fuel must be added frequently. If the load decreases, then tar begins to accumulate in the chimney.

Due to their versatility and excellent performance, solid fuel pyrolysis boilers for long burning are becoming more widespread and becoming more popular. Despite the high cost, they will quickly pay for themselves and fill your home with warmth and comfort.

Watch a video with a detailed review of the real owner of a long-burning solid fuel pyrolysis boiler:

In popularity they are second only to gas. At the same time, they have one serious drawback - fuel loading must be carried out several times a day. With the usual combustion of firewood, the efficiency of boilers does not exceed 75%, and part of the combustible substances simply flies into the chimney. Pyrolysis is much more practical and efficient.

Long-burning boilers took their name from the process that takes place in them - pyrolysis. The combustion of firewood occurs in several stages: first, the wood heats up and begins to char, while moisture, carbon oxides, nitrogen, hydrogen are released from its fibers - smoke consists of them. Most of these substances, when exposed to oxygen, burn with a bright flame. Its temperature is much higher than on the surface of the logs.

With a limited supply of oxygen, the firewood barely smolders, and the gases escape without combustion, this process is accompanied by a strong release of smoke, which contains a large amount of soot, carbon monoxide, sulfur compounds, nitrogen and hydrogen. For this feature they are called gas generators.

In pyrolysis units, unlike conventional furnaces, the combustion process is divided into two stages: in one zone of the boiler, the wood is heated to decomposition, in the other, pyrolysis gases are burned when air is blown by a fan. Separation of processes allows for more complete combustion of fuel and its components, as a result less ash is formed, and the smoke at the outlet has a temperature of less than 150 degrees and practically does not contain harmful substances that pollute the atmosphere.

Smoldering firewood is a long process, so the combustion time of fuel in gas generators is from 12 to 24 hours. For comparison, conventional solid fuel models can operate without reloading a maximum of 6 hours. This is due to the convenience of servicing long-burning boilers: they can be approached once a day.

Video: features and principle of operation of the gas generator

Design

The pyrolysis boiler consists of a fuel chamber divided into zones. In one of them, called the gas generator, the fuel is decomposed into ash and pyrolysis gases, in the other - the afterburning zone - these gases are burned.

Boilers are available in two types:
• with top loading, or mine;
• bottom loading.

Upper combustion mine boilers
They differ in that the combustion process in them spreads from top to bottom. In the fuel chamber, the combustion zones are separated by a grate. Firewood or other fuel is loaded onto it. After ignition of the boiler, pyrolysis occurs in the upper part of the furnace, and the flue gases descend into the lower afterburner chamber. Along the way, they heat the firewood below.

To overcome aerodynamic resistance and stabilize draft, the chamber is equipped with a blast fan mounted on top of the boiler - this process is called "top blast". Some models are equipped with another fan that blows air directly into the afterburner, which increases the efficiency of the boiler. Smoke and steam after afterburning through the flue pipe are discharged into the chimney.

Boilers with bottom combustion
In this type of heating units, the gas generating chamber is located below, and the pyrolysis gases rise up under the influence of traction. For sustainable combustion, such boilers require a height of at least 5 meters.

The use of a fan for boilers with bottom loading is not necessary, because air is supplied through the damper. The efficiency of lower combustion boilers is lower than that of mines, but they do not depend on the availability of electricity.

Heat exchanger and connection of the boiler to the heating system

Next to the firebox there is a heat exchanger through which the heat carrier of the heating system circulates. The design of the heat exchanger depends on the model of the unit. Fittings are provided for supplying and discharging water into the system. The inlet fitting, through which water cooled in the heating system enters the boiler, is located at the bottom of the heat exchanger. The outlet fitting is at the top. Water, better distilled, or antifreeze can be used as a coolant.

Long burning gas generators can operate in systems with natural or forced circulation. When choosing a boiler, it is necessary to coordinate the volumes of the heat exchanger and the heat carrier necessary to fill the heating system. The system is equipped with an expansion tank, and for forced circulation - with a pump, which is installed immediately before entering the boiler.

To stabilize the temperature in the heating system, it is also recommended to install a heat accumulator - a storage tank, which will be an intermediate link between the boiler and heating appliances. At the same time, during breaks in the boiler furnace, the system will not cool down by more than 10-15 degrees.
The water at the inlet to the heat exchanger must have a temperature specified by the manufacturer, usually 60 degrees Celsius. To maintain this temperature, the systems are equipped with a pipe for mixing hot water. In systems with forced circulation, in the event of a sudden power outage, a bypass must also be provided to bypass the circulation pump.

A number of models of pyrolysis gas generators, in addition to heating, can also be connected to the DHW circuit, such boilers are called double-circuit boilers. It is convenient if the unit is allowed to operate with the heating system turned off, only for heating water, which will allow it to be used in the summer. Typically, such models are equipped with additional heating elements built into the heat exchanger.

How to heat an apartment or house with underfloor heating, read
And if you are interested in non-standard methods of heating a house, then we advise you to get acquainted with the principles of operation of heat pumps: https://website/obogrevateli/teplovye-nasosy-princip-dejstviya.html

Housing material

Solid fuel boilers for long burning usually have a steel body with a thickness of 3 to 8 mm.

But some manufacturers offer cast iron boilers, which have several advantages:
• cast iron has an increased corrosion resistance compared to steel; low-temperature corrosion is not terrible for cast-iron boilers;
• cast-iron boilers with a forged heat exchanger do not have welds, in which the destruction of steel most often begins;
• thicker walls of cast iron units are not subject to burnout and deformation;
• thanks to their greater thickness, they do not cool down longer, which makes it possible to maintain the temperature in the system during a break for cleaning the boiler.

Cast iron models also have disadvantages:
• they are much heavier, 2-2.5 times;
• the price is higher than that of steel, by about 50-70%.

Fuel Requirements

Most modern models of pyrolysis boilers are equipped with automatic control of the combustion mode. The duration of burning depends on the type of fuel. As a rule, when burning with dry firewood, the gas generator can operate on one load for up to 12 hours, and on coal for about a day. The use of sawdust, shavings, woodworking waste somewhat reduces the burning time without reloading.