RU2798634C1 - Boiler house - Google Patents

Abstract

FIELD: thermal power engineering.

SUBSTANCE: boiler rooms and boilers are used for the production of thermal energy by municipal, industrial and other consumers, including thermal power plants. The aim of the invention is to increase the energy efficiency of a boiler house with a condensing economizer while preventing the formation of condensate in the chimney and stack and maximizing the use of sensible and latent heat of flue gases, which can potentially be used by useful heat consumers, in particular, water returning to the boiler, a heat pump, air supplied to the fuel combustion zone and for heating the boiler room, source water and chemically treated water for feeding the boiler room. The composition of the boiler room with a condensing economizer with chimneys and a stack resistant or non-resistant to flue gas condensate includes a generator of electric energy with a heat engine, whereas the exhaust gas path of the heat engine is connected to the appropriate places of the boiler room.

EFFECT: significant improvement thermotechnical parameters, economic indicators of boiler houses and operating conditions of chimneys and chimneys, as well as increasing the reliability of providing the boiler house with electric energy.

5 cl, 5 dwg, 3 tbl

Description

The invention relates to the field of thermal power engineering, where boilers and boilers are used for the production of thermal energy by municipal, industrial and other enterprises, including thermal power plants.

It is known that the maximum (theoretical) possible additional thermal power for heat generators, in particular, on natural gas, reaches 21%, of which (3-6)% by reducing the flue gas temperature to the dew point temperature (13-17)% due to condensation of water vapor contained in flue gases, in fact, it is practically impossible to achieve such values [1]. This is mainly due to the fact that at the boiler house or at the facility where the boiler house is located, as a rule: there are not enough sources of low-temperature heat carriers (low-grade heat payloads) that provide cooling of flue gases below the dew point, which can be water returning to the boiler , heat pump, air supplied to the fuel combustion zone and for heating the boiler room, source water and chemically treated water for feeding the boiler room; limited opportunities for energy efficient use of the potentially large amount of heat during condensation due to low parameters for temperature and water quality at the outlet of condensing economizers.

Many works in many countries of the world are devoted to increasing the efficiency of using the potential amount of heat released during the condensation of water vapor contained in flue gases.

Deep utilization of the heat of the combustion products is realized by cooling to a temperature below the dew point Tr. Reliable condensation of water vapor in the combustion products requires their cooling to a temperature of TGU = 40 ± 5°C, while the vapors contained in the blast air and formed during the combustion of fuel hydrocarbons are condensed. Cooling flue gases in condensing economizers below the dew point sharply reduces their moisture content, but does not exclude the possibility of condensation of residual water vapor in the chimneys and chimney, especially in the cold season. The condensate contains carbon dioxide, which negatively affects the chimneys and chimney. There are three ways to ensure reliable operation of the gas path after the condensing economizer: coating the internal surfaces of gas ducts and the chimney with protective waterproofing or making them from condensate-resistant materials; exclusion of condensate in the chimneys and chimney by heating the combustion products after the condensing economizer; lowering the dew point temperature of the flue gases after the economizer by adding heated dry air to them (drying) [2].

Currently, in the construction of new boiler houses, gas ducts and chimneys resistant to condensate are usually used, and in the reconstruction of existing boiler houses, devices for heating combustion products after a condensing economizer are mainly used [2-4].

1. A boiler house with a condensing economizer is known, in which the flue gases are heated after condensation by mixing the flue gases from the outlet of the absorption heat pump generator (ABTP) with the fire gas heating of the generator with flue gases of the boiler after the condensing economizer [3].

The disadvantage of preheating flue gases after condensation by mixing flue gases from the ABTN generator outlet with flue gases from the boiler after the condensing economizer is that the sensible and latent thermal energies of the ABTN flue gases, which could be used to heat payloads of low-grade heat, if these gases would be mixed with the flue gases of the boiler in front of the condenser (the composition of the flue gases of the boiler house boilers and the flue gases of fire gas heating are identical to each other, including the specific energy content of the steam contained in the flue gases). Thus, all the energy of water vapor contained in the flue gases of fire gas heating is not used, which is a significant drawback of this technical solution.

2. A combined heat recovery system [5] is known, in which a water-gas heat exchanger is installed along the flue gases of the boiler, where the return water of the heating network is heated. After this heat exchanger, the partially cooled flue gases enter the gas-air heat exchanger, where the cold air supplied to the boiler burners is heated. In such a system, deep cooling of the flue gases of the boiler is realized with the condensation of a part of the water vapor contained in these gases. To prevent corrosion destruction of the gas exhaust tract of the boiler plant, as a result of further formation of condensate in the chimneys and chimney, a gas heater is provided in the scheme, where the cooled flue gases are dried by heating with direct boiler water. The condensate formed in the heat recovery units can be used usefully in the boiler room or discharged into the sewer through the neutralizer.

The disadvantage of this system is that for heating and additional drying of the cooled and dried flue gases after the gas-air heat exchanger, a part of the useful thermal energy of the direct water of the boiler is used, which reduces the efficiency of the combined heat recovery system as a whole;

3. The most common technical solution and a close analogue - the prototype - is a boiler room with a condensing economizer, in which the flue gases are heated after the condensing economizer by passing part of the combustion products through a bypass channel - a bypass (with a control throttle valve) past the condensing economizer so that the temperature of the mixture gases behind it rose to Tcm.=65 - 70°C. [1]. The degree of bypass is usually in the range of 20-30% of the total volume of flue gases [2, 4].

The disadvantage of preheating flue gases after condensation using a bypass is that the sensible and latent thermal energies of the flue gases are significantly reduced, which could be used to heat payloads of low-grade heat when the flue gases are completely condensed. For example, when bypassing 30% of the flue gases, the sensible and latent thermal energies of the flue gases, which could be used to heat payloads, are reduced by 30%. The large amount of flue gas bypassing is due to the fact that the heating of flue gases after condensation occurs with the help of sufficiently low potential flue gases at the outlet of the boiler (110 - 130)°C. Moreover, the energy of water vapor contained in the flue gases that have passed through the bypass is not used in any way to heat the flue gases that have passed through the condensing economizer, since this steam escapes into the environment before it condenses. Thus, bypassing significantly worsens the thermal parameters of the boiler room with a condensing economizer, which is a significant drawback of the prototype.

The invention is based on the task of maximizing the use of the energy of water vapor contained in the flue gases of boilers with condensing economizers, regardless of the version of the source of low-temperature coolant for cooling flue gases using various types of fuel, and when using a source of low-temperature coolant based on ABTN with fire gas heating , then the energy of water vapor contained in the flue gases of fire gas heating, reducing the cost of electrical energy for the boiler house's own needs, reducing the cost of thermal energy in general, increasing the reliability of the boiler house. The task is solved:

1. A boiler house equipped with at least one boiler, at least one condensing economizer as part of the gas-air path of the boiler house, at least one source of low-temperature heat carrier, including one based on an absorption heat pump (ABTP) for cooling the flue gases of the boiler house, a return water pipeline to boiler room, chimneys and chimney, which are parts of the gas-air path of the boiler house and located after the condensing economizer, characterized in that the boiler room includes a generator of electric energy on a heat engine as the main source of electrical energy for the boiler house’s own needs, and a device that connects the exhaust gas path gases of the heat engine of the electric power generator with the gas-air path of the boiler room for transferring the exhaust gases of the heat engine of the generator to the gas-air path of the boiler house, the outputs and inputs of the low-potential thermal energy of the cooling circuit of the heat engine of the electric power generator are connected to the return water path of the boiler house, the electrical networks are connected to the boiler house as a backup power supply.

2. Boiler room according to claim 1, with chimneys and a chimney that are unstable to flue gas condensate, characterized in that the device is made in the form of a gas duct and connects the exhaust gas path of the heat engine of the electric power generator with the gas-air path of the boiler room after the condensing economizer.

3. Boiler room according to claim 1, with chimneys and a chimney resistant to flue gas condensate, characterized in that the device is made in the form of a gas duct and connects the exhaust gas path of the heat engine of the electric power generator with the gas-air path of the boiler room in front of the condensing economizer.

4. Boiler room according to claim 3, characterized in that the device connects the exhaust gas path of the heat engine of the electric power generator with the gas-air path of the boiler room at the point of air supply to the fuel combustion zone of the boiler (boilers).

5. Boiler room according to paragraphs. 1, 3, 4 with a source of low-temperature coolant for a condensing economizer based on ABTN with fire gas heating of the ABTN generator, characterized in that the device connecting the exhaust gas path of the heat engine with the gas-air path of the boiler room consists of a gas duct, one end of which is connected to the exhaust gas path of the thermal engine, the other end is connected to the input of the ABTN generator, the gas-air path of the ABTN generator and an additional gas duct, one end of which is connected to the flue gas outlet of the ABTN generator, the other end is connected to the gas-air path of the boiler house.

The listed features of the proposed technical solution are the essential features (essence) of the claimed invention, and their combination allows you to get the expected result. This is explained by the drawings, where:

Fig. 1 is a schematic representation of an analogue.

Fig. 2 is a schematic representation of a boiler house (hot water) equipped with at least one boiler 1, a condensing economizer 2 with its sections 11, 12, 13 and 14, connected to the corresponding sources of low-temperature heat carriers 3, water returning to the boiler, water from the chemical treatment plant 15 , source water for feeding the boiler house, air heat exchanger 16 supplied to the fuel combustion zone and for heating the boiler room (the number of sections of the condensing economizer for different boiler houses may be different and will be determined from the energy potential of each source of low-temperature coolants 3), chimneys 4 and a chimney 5 (4 and 5 are parts of the gas-air path of the boiler room), a return water pipeline 9 to the boiler room, characterized in that the boiler room includes an electric power generator on a heat engine 7, while in the boiler room with chimneys and a chimney, they are unstable to flue gas condensate , the exhaust gas path 6 of the heat engine is connected to the chimney 4 after the condensing economizer, the outputs and inputs of the engine thermal cooling circuits are connected to the direct 8 and return 9 water pipelines of the boiler house through the corresponding heat exchangers 10, the electrical networks 17 are a backup power source.

The introduction of a generator of electric energy on a thermal engine 7 into the composition of the boiler room makes it possible to obtain: exhaust gases with a higher temperature and with a lower specific moisture content than the flue gases at the outlet of the boiler (boilers), for example, when using an electric power generator on a gas-piston engine exhaust gas temperature approximately 400°C versus 130°C than that of flue gases at the outlet of the boiler (boilers) with a lower specific moisture content of about two times; electricity for own needs, which increases the reliability of power supply to the boiler house and reduces electricity costs.

In the case when the chimney 4 and the chimney are not resistant to condensate, connecting the exhaust gas path 6 of the heat engine to the chimney 4 after the condensing economizer allows you to replace low-temperature (130 ° C) flue gases supplied by the bypass to the gas-air path of the boiler room after the condensing economizer in the prototype to a smaller amount of exhaust gases with a higher temperature (400 ° C) and with a lower specific moisture content than the flue gases at the outlet of the boiler (boilers).

This will allow: to use all the apparent and latent thermal energy of flue gases while reducing their temperature at the outlet of the boiler (boilers) to the temperature of these gases at the outlet of the condensing economizer, approximately 30% more than that of the prototype; to reduce the dew point temperature of the flue gases into the chimney (a mixture of flue and exhaust gases) in comparison with the prototype, which will help prevent condensation in the chimney.

Fig. 3 is a schematic representation of a boiler room with condensate-resistant chimneys 4 and a chimney 5 differs from the boiler room of FIG. Therefore, the connection of the exhaust gas path 6 of the heat engine to the gas-air path of the boiler room in front of the condensing economizer 2 makes it possible to use all the sensible and latent thermal energy of the exhaust gases, while reducing their temperature at the outlet of the heat engine to the temperature of these gases at the outlet of the condensing economizer, for additional heating of low-temperature coolants 3 (payloads).

Fig. 4 is a schematic representation of the boiler room of FIG. 4 differs from the boiler room of FIG. 3 in that the exhaust gas path 6 of the heat engine is connected to the gas-air path of the boiler room at the point of air supply to the fuel combustion zone of the boiler (boilers). The supply of exhaust gases to the fuel combustion zone is preferable before the supply of exhaust gases to the boiler duct before the condensing economizer, since in this case the volume of blast (primary) air can be reduced by the volume of air contained in the exhaust gases, determined by a relatively large value of a (excess air coefficient ) for heat engines than for boilers, this reduces the specific fuel consumption.

Fig. 5 is a schematic representation of a boiler room with chimneys 4 and a chimney 5, in particular, a condensate-resistant absorption heat pump (ABTN) 17 with fired gas heating of the ABTN generator 18, characterized in that, a device connecting the exhaust gas path 6 of a heat engine with gas-air path of the boiler house consists of a gas duct, one end of which is connected to the exhaust gas path of the heat engine, the other end is connected to the inlet of the ABTN generator, the gas-air path of the ABTN and an additional gas duct 19, one end of which is connected to the flue gas outlet of the ABTN generator, the other end is connected to the gas-air path of the boiler room, in In this case, at the place where air is supplied to the fuel combustion zone of the boiler (boilers). In this scheme, the ABTN evaporator 20 is a source of low-temperature heat carrier (low-grade heat payload), which provides cooling of the boiler flue gases below the dew point, practically regardless of the temperature of the water returning to the boiler (boiler room).

The composition of flue gases of boilers (boiler house) and flue gases of fire gas heating are identical to each other, including the specific content of steam energy contained in flue gases. Thus, all the sensible and latent thermal energy contained in the flue gases of combustion gas heating, when their temperature drops to the temperature of these gases at the outlet of the condensing economizer, is used for additional heating of low-temperature coolants 3 (payloads) along with the sensible and latent thermal energy of flue gases. boiler room gases.

Boiler operation Fig. 5 is similar to the operation of the boiler rooms of Fig.2 - 4 and, for example, in the case when the volume of fuel gas entering the boilers of Fig.2-4 is equal to the sum of the volumes of fuel gas entering the boiler and the ABTN generator of Fig.5, then the thermal parameters of the boiler fig. 2-4 and Fig.5 are the same.

The advantage of the boiler room of FIG. 5 in front of the boiler rooms of FIG. 2-4 is that, while maintaining the volume of fuel gas entering the boiler, and supplying additional fuel gas to the input of the ABTN generator, the output power of the boiler room increases by more than the thermal power of the additional fuel gas entering the ABTN generator. This is explained by the fact that, in addition to the thermal energy released during the combustion of additional fuel gas, the latent thermal energy of the flue gases of the ABTN generator is also used, since they are condensed by a condensing economizer.

Let us evaluate the operation of the proposed technical solutions of Fig. 2-5 in comparison of their efficiency relative to the boiler room before the installation of the condensing economizer and the technical solution of the prototype on the example of using the PTVM 100 boiler in the boiler room.

Below are the data of the PTVM 100 boiler during its operation:

Before installing a condensing economizer:

1. Boiler operating mode 100 MW.

2. The main fuel of the boiler house is natural gas (qg = 8180 kcal/ ^nm3 ).

3. α - coefficient of excess air - 1.2.

4. Boiler efficiency at Рout = 100 MW - 0.92.

5. Gas consumption - Vgk = 11442 nm ³ / hour.

6. Specific fuel consumption per 1 MW - Vsp = 114.42 nm ³ .

7. Ambient temperature, t _oc - minus 20°C.

8. Air temperature in the burner during the cold season, t _vg plus 22°C.

9. The temperature of the flue gases, t _ug 130°C.

10. Consumed electrical energy of the boiler house - in winter ~ 1200 kW per hour - in summer ~ 500 kW per hour.

11. The cost of gas for the boiler house is 6000 rubles / 1000 m ³ without VAT.

12. The cost of electricity is 5,000 rubles/MWh without VAT.

13. The cost of thermal energy is 800 rubles/Gcal without VAT.

After installing a condensing economizer:

14. Gas consumption - 11442 nm ³ / hour

15. Ambient temperature, t _oc minus 20°С.

16. The temperature of the air into the burner during the cold season will be brought up to _tvg plus 22°C with the help of a heater.

17. Flue gas temperature after the condensing economizer tke=38°C: for the proposed technical solution of Fig.2 and Fig.2a before the additional section 13 of the economizer. At the same time, the flue gas temperature after the condensing economizer tke = 38°C can be provided by any useful sources containing low-temperature heat carriers for cooling flue gases, in particular, return network water, a heat pump, air supplied to the fuel combustion zone and for heating the boiler room , source water and chemically treated water for feeding the boiler house.

18. Parameters of a concrete chimney: height H = 105 m; average wall thickness = 0.327 m; average pipe diameter 8.1 m.

19. Gas piston electric generator based on the TCG 2020 V12 engine [6]:

Electric power 1200 kW

Electrical efficiency 37%

Motor thermal power 650 kW

Exhaust temperature 414°С

Thermal power of exhaust gases at 120°С 590 kW

Fuel utilization factor 0.89

Gas consumption, Vgpg, (8180 kcal/m ³ ) 289 Nm3/h

Exhaust gas consumption 6606 kg/h

Exhaust gas consumption 5231 m ³ /h

Water vapor content in exhaust gases 429 kg/h

Exhaust gas consumption, dry 4697 m ³ / h

Table 1 below summarizes the calculations carried out on the basis of formula 1-1 and tables 1.2 and 1.3, set out in section 1.1 [1],

Where

as well as a simplified formula for calculating the dependence of the smoke temperature on the height of the chimney

- отсчитывается от основания дымовой трубы,

- is measured from the base of the chimney,

Tn - the initial temperature of the flue gases at the base of the chimney (i.e., the point of insertion of the chimney into the chimney),

Tacr - ambient temperature;

k - coefficient of heat transfer from "smoke" through the wall of the chimney to the environment (atmosphere) (W/(m ^∧ 2°C)),

D - chimney diameter (m),

G- smoke consumption (m3/s),

C is the heat capacity of smoke (j/(m ^∧ 3°C));

k - heat transfer coefficient is determined by the formula

- теплопроводность бетона (дж/(м°С)),Where

- thermal conductivity of concrete (J / (m ° C)),

dtr - pipe thickness (m),

α(d.bet) - heat transfer coefficient from flue gases to concrete (W/(m ^∧ 2°С)),

α(bet.air) - heat transfer coefficient of concrete to air (W/(m ^∧ 2°С)).

Comparative analysis of the efficiency of options for the execution of the boiler room in relation to the prototype (table 1) shows that when using the proposed technical solution (inclusion of a gas piston generator in the boiler room, in particular, to meet the boiler house's own needs):

- the output power of the boiler house is increased in comparison with the boiler house without a condensing economizer and the boiler house of the prototype of FIG. 1, see line 1;

- boiler house with chimneys and a chimney that are unstable to condensate (Fig. 2) 111.863 MW, respectively, against 100 MW and 107.849 MW;

- boiler room with condensate resistant chimneys and chimney (Fig. 3) 112.744 MW against 100 MW and 107.849 MW, respectively;

- boiler room with condensate-resistant chimneys and chimney (Fig. 4, Fig. 5) 112.810 MW against 100 MW and 107.849 MW, respectively;

- unit costs are reduced (per 1 MW of thermal energy) for the energy carriers of the boiler house in comparison with the boiler house without a condensing economizer and the boiler house of the prototype of FIG. 1, see line 7;

- boiler room with chimneys and a chimney that are unstable to condensate (Fig. 2) 629.2 rubles. respectively against 746.52 rubles. and 692.19 rubles;

- a boiler room with condensate-resistant chimneys and a chimney (Fig. 3,) 624,299 rubles. respectively against 746.52 rubles. and 692.19 rubles;

- boiler room with condensate-resistant chimneys and chimney (fig. 4, fig. 5) 623,934 rubles. respectively against 746.52 rubles. and 692.19 rubles;

- simultaneously produces electricity for own needs with a capacity of 1.2 MW, see line 2;

- the efficiency of using a gas-piston generator in an existing boiler house equipped with a condensing economizer, chimneys and a chimney that are unstable to flue gas condensate is higher than the efficiency of using a classic cogeneration plant based on the same gas-piston generator, made according to the manufacturer's passport, fuel utilization factor gas-piston generator, according to the proposed technical solution (Fig. 2) -2.03 by (114%), higher than the fuel utilization factor of a cogeneration plant according to the passport for a gas-piston generator - 0.89, and boiler rooms with chimneys and a chimney are stable to flue gas condensate - (0.993 - 0.999) by (11.6 - 12)%), see line 5;

- when using a gas piston generator in boiler rooms according to technical solutions (Fig. 2-5), the exhaust gases of the engines are utilized by the blocks that are part of the boiler rooms, which, unlike the classical cogeneration plant, eliminates the need to create a separate exhaust gas heat exchanger boiler. This reduces the necessary capital costs when the gas piston generator is included in the boiler room, which also helps to reduce the payback period for the introduction of the gas piston generator into the boiler room;

- in the considered example, the technical solution (Fig. 2) provides protection of the chimneys and chimney from condensate with a larger margin than the prototype (Fig. 1), due to the smaller ratio of flue gas temperature change to the allowable change to the dew point (0.758 versus 0.794) , see line 11 and reduce the moisture content of flue gases of the boiler room 6035 kg versus 10786, see line 12, in addition, the reliability of the chimney increases due to the reduction of thermal stresses during its operation with lower temperature differences between the temperatures of the inner and outer walls of the chimney , as well as flue gas temperatures at the inlet and outlet of the chimney due to the simultaneous decrease in temperature and flue gas temperature change ratio, see lines 8-10.

Thus, the inclusion of an electric power generator on a heat engine as part of a boiler room with a condensing economizer with chimneys and a chimney resistant or unstable to flue gas condensate, when the exhaust gas path of the heat engine is connected to the appropriate places in the gas-air path of the boiler room, leads to a significant improvement in thermal parameters, economic indicators of boiler houses and operating conditions of chimneys and chimneys, as well as increases the reliability of the supply of electric power to the boiler house.

The analysis of the level of technology carried out by the applicants, including the search for patent and scientific and technical sources of information, as well as the discovery of sources containing information about analogues of the claimed invention, made it possible to establish that the applicant did not identify a technical solution characterized by features identical or equivalent to the proposed one, while the invention does not follow in an obvious way for a specialist from the prior art and defined by the applicant. The definition from the list of found analogues of the prototype, as the closest technical solution in terms of the set of features, made it possible to identify in the claimed device a set of essential characteristic features, therefore the claimed technical solutions of the boiler house are effective and meet the criterion of "novelty".

In addition, the proposed boiler house is suitable for industrial use, since it does not contain any structural elements or materials that could not be reproduced at the present stage of development of science and technology, in particular, in the field of thermal power engineering, and therefore this technical solution is considered appropriate. criterion "industrial suitability".

Literature:

[1] Bespalov Viktor Vladimirovich. Improving the efficiency of deep utilization of heat from flue gases of TPPs running on natural gas. Thesis. https://www.dissercat.com/content/povyshenie-effektivnosti-glubokoi-utilizatsii-tepla-dymovykh-gazov-tes-na-prirodnom-gaze.

[2] UDC 662.613 Kudinov A.A. Energy saving in heat generating installations. - Ulyanovsk: UlGTU, 2000 -139 p.

[3] Shadek E.G. Transfer of heating water boilers to the condensing mode // S.O.K. Plumbing. Heating. Conditioning. - 2016. - No. 4 - S. 78-81. https://www.c-o-k.ru/articles/perevod-otopitelnyh-vodogreynyh-kotlov-v-kondensaciomiyy-rezhim.

[4] Shadek E.G. Deep utilization of heat from combustion products of heating water boilers // News of heat supply - 2016. - No. 8. - S. 38-40. https://www.rosteplo.ru/Tech_stat/stat_shablon.php?id=3249.

[5] UDC 536.24:621.184.5 Energy-efficient heat recovery system for heating of heat network water and blast air of boilers of municipal thermal power industry. Navrodskaya R.O., Ph.D. tech. Sciences, Fialko N.M., Corresponding Member. NAS of Ukraine, Gnedash G.A., Ph.D. tech. Sciences, Sbrodova G.A., Ph.D. physical - mat. Sciences. Institute of Technical Thermal Physics of the National Academy of Sciences of Ukraine, st. Zhelyabova, 2a, Kyiv, 03680, Ukraine.

[6] www.mwm.net.

Claims (5)

1. Boiler house equipped with at least one boiler, at least one condensing economizer as part of the gas-air path of the boiler house, at least one source of low-temperature heat carrier, including one based on an absorption heat pump (ABTP) for cooling flue gases of the boiler house, a return water pipeline to boiler room, chimneys and chimney, which are parts of the gas-air path of the boiler house and located after the condensing economizer, characterized in that the boiler room includes a generator of electric energy on a heat engine as the main source of electrical energy for the boiler house’s own needs, and a device that connects the exhaust gas path gases of the heat engine of the electric power generator with the gas-air path of the boiler room for transferring the exhaust gases of the heat engine of the generator to the gas-air path of the boiler house, the outputs and inputs of the low-potential thermal energy of the cooling circuit of the heat engine of the electric power generator are connected to the return water path of the boiler house, the electrical networks are connected to the boiler house as a backup power supply. 2. The boiler room according to claim 1, characterized in that the chimneys and the chimney are unstable to flue gas condensate, the device is made in the form of a flue and connects the exhaust gas path of the heat engine of the electric power generator with the gas-air path of the boiler room after the condensing economizer. 3. The boiler house according to claim 1, characterized in that the chimneys and the chimney are resistant to flue gas condensate, the device is made in the form of a gas duct and connects the exhaust gas path of the heat engine of the electric power generator with the gas-air path of the boiler room in front of the condensing economizer. 4. Boiler room according to claim 3, characterized in that the device connects the exhaust gas path of the heat engine of the electric power generator with the gas-air path of the boiler room at the point of air supply to the fuel combustion zone of the boiler (boilers). 5. Boiler room according to claim 4, characterized in that the source of low-temperature coolant for a condensing economizer based on ABTN with fire gas heating of the ABTN generator, a device connecting the exhaust gas path of the heat engine with the gas-air path of the boiler room, consists of a gas duct, one end of which is connected to exhaust gas path of the heat engine, the other end is connected to the inlet of the ABTN generator, the gas-air path of the ABTN generator and an additional gas duct, one end of which is connected to the flue gas outlet of the ABTN generator, the other end is connected to the gas-air path of the boiler house.

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