Energy system for coupled compressed gas supply and high back pressure multi-stage heating of residential heating

Abstract

This invention discloses an energy system for residential heating that couples compressed gas supply and high back pressure multi-stage heating, including a thermal power unit. A high back pressure condenser is connected to a return water pipe. A medium-low pressure connecting pipe is provided between the medium-pressure cylinder and the low-pressure cylinder, and a secondary heating pipe is connected to the medium-low pressure connecting pipe. The secondary heating pipe is connected to a secondary peak heater connected to the heating return water pipe. A main steam pipe is connected to a main diversion pipe, which is connected to a small steam turbine. The small steam turbine is driven by a compressed gas assembly, and the small steam turbine has an exhaust pipe connected to a tertiary peak heater connected to the heating water supply pipe. The high back pressure condenser, the secondary peak heater, and the tertiary peak heater are sequentially connected by pipes, and the tertiary peak heater is externally connected to a heating pipe. This invention can achieve a stable and efficient supply of compressed gas to the thermal power unit, increasing the heating area by approximately 1 million to 1.5 million square meters.

Description

Technical Field

[0001] This invention relates to the field of electric locomotive braking technology, and more particularly to an energy system for coupled compressed gas supply and high back pressure multi-stage heating for residential heating. Background Technology

[0002] Currently, most combined heat and power (CHP) units in China use direct heat supply to achieve CHP, such as directly supplying steam and hot water. Urban coal-fired power plants have abundant and diverse steam resources, which can not only provide heat and electricity, but also have the ability to provide compressed air, compressed carbon dioxide, and other products.

[0003] There are three main types of existing residential heating technologies: medium- and low-pressure interconnected pipe steam extraction heating, high back pressure heating, and low-pressure cylinder zero-output heating. Medium- and low-pressure interconnected pipe heating and low-pressure cylinder zero-output heating both use steam exhaust from the medium-pressure cylinder to heat the return water (around 40°C) to around 100°C before supplying it. High back pressure heating units typically use a high back pressure condenser as the first-stage heater to heat the return water (around 40°C) to around 75°C, and then use medium- and low-pressure interconnected pipe steam extraction as a peak heater to heat the 75°C hot water to around 100°C.

[0004] Currently, most chemical plants use gas turbines or electric compressors to produce compressed gas. These methods consume a lot of energy and are not economical.

[0005] Therefore, it is essential to develop an energy system that can achieve low-cost and high-efficiency compressed gas production and improve the heating capacity of residents, taking into full account the abundant energy resources of coal-fired power plants and their actual operating conditions. Summary of the Invention

[0006] The present invention aims to at least partially solve one of the technical problems in the related art.

[0007] To achieve the above objectives, the present invention proposes an energy system for residential heating that couples compressed gas supply and high back pressure multi-stage heating, including a thermal power unit, wherein the thermal power unit includes a boiler assembly, a high-pressure cylinder, a medium-pressure cylinder, a low-pressure cylinder, and a regenerative system for condensing steam and resupplying it to the boiler.

[0008] The regenerative system includes a high back pressure condenser, which is connected to a regenerative water intake pipe for primary heating of the heating return water.

[0009] A medium-low pressure connecting pipe is provided between the medium-pressure cylinder and the low-pressure cylinder, and a secondary heating pipe is connected to the medium-low pressure connecting pipe, and a secondary peak heater is connected to the secondary heating pipe.

[0010] A main steam pipe is provided between the boiler assembly and the high-pressure cylinder. A main diversion pipe is connected to the main steam pipe. A small steam turbine is connected to the main diversion pipe. A compressed gas assembly is driven by the small steam turbine. An exhaust pipe is provided to the small steam turbine. A three-stage peak heater is connected to the heating water supply pipe.

[0011] The high back pressure condenser, the secondary peak heater, and the tertiary peak heater are sequentially connected by pipelines.

[0012] This invention achieves a stable, efficient, and reliable supply of compressed gas to coal-fired power units by installing a gas compression assembly connected to a small steam turbine drive, thereby increasing the variety of products available for sale and finding new profit points. Furthermore, it increases the heating capacity of coal-fired units during the heating season. During the heating season, the heating return water is first preheated by passing it through a high back-pressure condenser, then further heated by steam in the intermediate and low-pressure cylinder connecting pipes, and finally tertiary heated by exhaust steam from the small steam turbine as a heat source for a third-stage peak heater. This can increase the heating area by approximately 1-1.5 million square meters.

[0013] Optionally, a third regulating valve is installed downstream of the interface of the secondary heating pipe corresponding to the medium- and low-pressure connecting pipe.

[0014] Furthermore, the regenerative system includes a No. 3 high-temperature feedwater heater and a deaerator. The intermediate-pressure cylinder is connected to the No. 3 high-temperature feedwater heater and the deaerator by two independent steam return pipes. The exhaust pipe is connected to the two steam return pipes by a constant return pipe, so that steam in the exhaust pipe can return to the regenerative system during the non-heating season.

[0015] Furthermore, a first check valve, a first regulating valve, and a first isolation valve are sequentially installed along the main steam pipe from the main steam pipe to the small steam turbine.

[0016] Furthermore, the secondary heating pipe is provided with a second check valve, a second regulating valve and a second isolation valve in sequence along the steam flow direction.

[0017] Furthermore, a fourth regulating valve is installed downstream of the location where the exhaust pipe connects with the normal return pipe, and a fifth regulating valve is installed on the normal return pipe. A sixth regulating valve is installed on the pipe of the normal return pipe that is connected to the steam return pipe that returns to the deaerator, and a seventh regulating valve is installed on the pipe of the normal return pipe that is connected to the steam return pipe that returns to the No. 3 high-temperature feedwater heater.

[0018] Furthermore, a pressure reducer is installed on the constant return pipe.

[0019] Furthermore, a high back-pressure condenser is connected to the outlet of the low-pressure cylinder, and the condensate outlet of the secondary peak heater is connected to the outlet of the high back-pressure condenser.

[0020] Furthermore, the regenerative system includes a deaerator, and the condensate outlet of the secondary peak heater is connected to the inlet of the deaerator.

[0021] Furthermore, the compressed gas assembly includes a first compressor that is drivenly connected to the small steam turbine, the compressor is connected to a gas source pipeline, the gas source pipeline is connected to a compressed gas source, and the outlet of the first compressor is connected to a gas product pipeline.

[0022] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0023] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the following description of the embodiments taken in conjunction with the accompanying drawings, wherein:

[0024] Figure 1 This is a schematic diagram of the structure of an energy system for residential heating with coupled compressed gas supply and high back pressure multi-stage heating according to an embodiment of the present invention.

[0025] Explanation of reference numerals in the attached figures:

[0026] 1. Boiler assembly; 2. High-pressure cylinder; 3. Medium-pressure cylinder; 4. Low-pressure cylinder; 5. Small steam turbine; 6. Main steam pipeline; 7. Main diversion pipeline; 8. Exhaust pipeline; 9. Secondary heating pipeline; 10. Medium and low-pressure connecting pipeline; 11. Secondary peak heater; 12. Tertiary peak heater; 13. Constant return pipeline; 14. First compressor; 15. First check valve; 16. First regulating valve; 17. First isolation valve; 18. Second check valve; 19. Second regulating valve; 20. Second isolation valve; 21. Third regulating valve; 22. Fourth regulating valve; 23. Fifth regulating valve; 24. Sixth regulating valve; 25. Seventh regulating valve; 26. Pressure reducer; 27. Condenser. Detailed Implementation

[0027] Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0028] This invention provides an energy system for residential heating that couples compressed gas supply with high back pressure multi-stage heating, referring to... Figure 1 The thermal power unit includes a boiler assembly 1, a high-pressure cylinder 2, a medium-pressure cylinder 3, a low-pressure cylinder 4, and a regenerative system for condensing steam and resupplying it to the boiler.

[0029] The regenerative system includes a high back pressure condenser 27, which is connected to a regenerative water intake pipe for primary heating of the heating return water.

[0030] A medium-low pressure connecting pipe 10 is provided between the medium-pressure cylinder 3 and the low-pressure cylinder 4, and a secondary heating pipe 9 is connected to the medium-low pressure connecting pipe 10. A secondary peak heater 11 is connected to the secondary heating pipe 9.

[0031] A main steam pipe 6 is provided between the boiler assembly 1 and the high-pressure cylinder 2. A main diversion pipe 7 is connected to the main steam pipe 6. A small steam turbine 5 is connected to the main diversion pipe 7. A compressed gas assembly is driven by the small steam turbine 5. An exhaust pipe 8 is provided for the small steam turbine 5. A three-stage peak heater 12 is connected to the heating water supply pipe.

[0032] The high back pressure condenser 27, the secondary peak heater 11, and the tertiary peak heater 12 are sequentially connected by pipelines.

[0033] The thermal power unit includes a boiler assembly 1, a high-pressure cylinder 2, an intermediate-pressure cylinder 3, a low-pressure cylinder 4, and a regenerative system for condensing steam and resupplying it to the boiler. The main steam pipe 6 of the boiler assembly 1 is connected to the inlet of the high-pressure cylinder 2. The boiler assembly 1 includes a boiler reheater and is also connected to a hot reheat steam pipe. The hot reheat steam pipe is connected to the inlet of the intermediate-pressure cylinder 3. The outlets of the high-pressure cylinder 2 and the intermediate-pressure cylinder 3 are connected to the regenerative system. The regenerative system includes high-temperature feedwater heaters numbered one to three (referred to as high-pressure heaters in the figure) and low-temperature feedwater heaters numbered five to eight (referred to as low-temperature heaters in the figure), a deaerator feedwater assembly, and a condenser. High-temperature feedwater heaters numbered one to three are connected in sequence to reheat the condensate after deaeration by the deaerator. Pipes numbered five to eight are connected in sequence to heat the condensate flowing out of the high back-pressure condenser 27 at low temperature.

[0034] The No. 1 to No. 3 high-temperature feedwater heaters are connected to the high-pressure cylinder 2 and the medium-pressure cylinder 3 respectively. The No. 5 to No. 8 high-temperature feedwater heaters are all connected to the low-pressure cylinder 4. The high-back-pressure condenser 27 is located between the outlet of the low-pressure cylinder 4 and the No. 8 low-temperature feedwater heater. A deaerator and a feedwater pump are installed between the No. 3 and No. 5 high-temperature feedwater heaters. The No. 1 high-temperature feedwater heater is connected to the inlet of boiler assembly 1. The deaerator feedwater assembly is connected to the medium-pressure cylinder 3. The two steam outlets of the high-pressure cylinder 2 are connected to the No. 1 and No. 2 high-temperature feedwater heaters respectively. The other steam outlet of the medium-pressure cylinder 3 is connected to the No. 3 high-temperature feedwater heater. The No. 1 to No. 3 high-temperature feedwater heaters and the deaerator feedwater assembly are connected in sequence by a return pipe. The No. 5 to No. 8 low-temperature feedwater heaters and the high-back-pressure condenser 27 are also connected in sequence by a return pipe.

[0035] A portion of steam is drawn from the main steam pipe 6 along the main diversion pipe 7 to power the small steam turbine 5. The small steam turbine 5 drives the compressed gas assembly to perform compressed gas operation. At the same time, a drive steam pipe is set on the main steam pipe 6, and a portion of steam is drawn from the main steam pipe 6 as drive steam to accelerate the exhaust of the small steam turbine 5, thereby promoting the steam extraction from the main steam pipe 6 by the small steam turbine 5.

[0036] This invention achieves a stable, efficient, and reliable supply of compressed gas to coal-fired power units by installing a gas compression assembly connected to the small steam turbine 5, thereby increasing the variety of products available for sale and finding new profit points. Furthermore, it increases the heating capacity of the coal-fired power units during the heating season. During the heating season, the heating return water is first preheated at the high back-pressure condenser 27, then further heated by steam in the intermediate and low-pressure cylinder connecting pipes, and finally tertiary heated by exhaust steam from the small steam turbine 5 as a heat source for the third-stage peak heater 12. This can increase the heating area by approximately 1 million to 1.5 million square meters.

[0037] In some embodiments, a first check valve 15, a first regulating valve 16, and a first isolation valve 17 are sequentially arranged on the main diversion pipe 7 along the direction from the main steam pipe 6 to the small steam turbine 5. The arrangement of the first check valve 15 and the first isolation valve 17 can facilitate system isolation between the main steam pipe 6 and the small steam turbine, and the first regulating valve 16 can effectively control the amount of steam entering the small steam turbine 5.

[0038] In some embodiments, the compressed gas assembly includes a first compressor 14 driven by a small steam turbine 5. The compressor is connected to a gas source pipeline, which is connected to a compressed gas source. The outlet of the first compressor 14 is connected to a gas product pipeline. The compressed gas source can be various gases such as air, carbon dioxide, and nitrogen. The small steam turbine 5 drives the first compressor 14 under the drive of steam extracted from the main steam pipeline 6. The compressed gas enters the first compressor 14 along the gas source pipeline, and after compression by the first compressor 14, the gas is output along the gas product pipeline. The compressed gas supply and heating load guarantee are highly flexible, and the unit's operational flexibility is greatly improved.

[0039] In some embodiments, the small steam turbine 5 is connected to the compressor via a steam drive shaft.

[0040] In some embodiments, a second compressor is connected to the gas source pipeline, and the second compressor is an electric compressor. When the thermal power unit or small steam turbine 5 needs maintenance or malfunctions, the second compressor can maintain the gas compression operation normally, thereby ensuring the normal production supply of compressed gas.

[0041] In some embodiments, the exhaust pressure in the exhaust pipe 8 is 1-2 MPa. In one preferred embodiment, the exhaust pressure in the exhaust pipe 8 is 1 MPa.

[0042] In some embodiments, a third regulating valve 21 is provided downstream of the interface of the medium-low pressure connecting pipe 10 corresponding to the secondary heating pipe 9, so as to regulate the steam flow rate entering the secondary heating pipe 9 by adjusting the steam flow rate of the medium-low pressure connecting pipe 10 when supplying steam to the secondary heating pipe 9.

[0043] In some embodiments, a second check valve 18, a second regulating valve 19, and a second isolation valve 20 are sequentially arranged along the steam flow direction on the secondary heating pipe 9. The second check valve 18 and the second isolation valve 20 can facilitate system isolation of the systems connected at both ends of the secondary heating pipe 9, and the second regulating valve 19 can effectively control the amount of steam entering the small steam turbine 5.

[0044] In some embodiments, during the non-heating season, the small steam turbine 5 does not need to serve as a heat source for residential heating as the third-stage peak heater 12; instead, the exhaust steam needs to be returned to the regenerative system for deaeration and heating. Therefore, the regenerative system includes a third-stage high-temperature feedwater heater and a deaerator. Two independent steam return pipes are connected between the intermediate-pressure cylinder 3 and the third-stage high-temperature feedwater heater and the deaerator, respectively. The exhaust pipe 8 is connected to each of the two steam return pipes by a permanent return pipe 13, so that steam in the exhaust pipe 8 returns to the regenerative system during the non-heating season.

[0045] In some embodiments, in order to ensure that the steam in the exhaust pipe 8 enters the constant return pipe 13 and achieves the same steam pressure as the steam inlet pressure of the No. 3 high temperature feedwater heater or the deaerator, a pressure reducer 26 is installed near the inlet of the constant return pipe 13.

[0046] In some embodiments, a fourth regulating valve 22 is provided downstream of the location where the exhaust pipe 8 is connected to the normal return pipe 13, and a fifth regulating valve 23 is provided on the normal return pipe 13. A sixth regulating valve 24 is provided on the pipe of the normal return pipe 13 corresponding to the steam return pipe connected to the deaerator, and a seventh regulating valve 25 is provided on the pipe of the normal return pipe 13 corresponding to the steam return pipe connected to the No. 3 high-temperature feedwater heater.

[0047] In some embodiments, a high back-pressure condenser 27 is connected to the outlet of the low-pressure cylinder 4, and the condensate outlet of the secondary peak heater 11 is connected to the outlet of the high back-pressure condenser 27. This is used to discharge the condensate from the secondary peak heater 11 into the return system. Since the heating return water temperature is generally around 45°C, it needs to be heated to around 75°C in the high back-pressure condenser 27 before being connected to the secondary peak heater 11 for heating to around 100°C. Therefore, the condensate temperature after steam enters the secondary heater for heat exchange is not higher than the condensate temperature after heating by the tertiary peak heater 12, and it needs to be first fed into the low-temperature feedwater heater through the outlet of the high back-pressure condenser 27 for heating.

[0048] In some embodiments, the regenerative system includes a deaerator, and the condensate outlet of the tertiary peak heater 12 is connected to the deaerator inlet. This deaerator is used to discharge the condensate from the tertiary peak heater 12 into the return system. The heating water supply needs to be heated to approximately 105°C in the tertiary peak heater 12. The heat demand during the heat exchange process in the tertiary peak heater 12 is less than or equal to the heat demand in the secondary peak heater 11. Therefore, the temperature of the condensate in the tertiary peak heater 12 does not decrease significantly after heat exchange and can be directly deaerated before being supplied to the high-temperature feedwater heater for heating.

[0049] The heating return water (generally around 45℃) is first heated to about 75℃ in the high back-pressure condenser 27, which serves as the primary heater. Then, it is connected to the secondary peak heater 11 and the tertiary peak heater 12 for secondary and tertiary heating, respectively. The heating return water is finally heated to about 105℃ before being supplied to the outside for heating. The steam in the secondary peak heater 11 is taken from the medium and low pressure connecting pipe. The second regulating valve 19, the third regulating valve 21, and the fourth regulating valve 22 participate in regulating the steam extraction rate. The condensate at the outlet of the secondary peak heater 11 is collected at the outlet of the high back-pressure condenser 27. The steam in the tertiary peak heater 12 is taken from the exhaust steam of the small steam turbine 5. The condensate at the outlet of the tertiary peak heater 12 is collected at the inlet of the deaerator (the condensate temperature and pressure are matched with the return water temperature and pressure at the inlet of the deaerator).

[0050] During the non-heating season, the exhaust steam from the small steam turbine No. 5 enters either the deaerator or the No. 3 high-temperature feedwater heater depending on the unit load. Typically, when the unit's electrical load is greater than 50% THA, the fourth regulating valve 22 is closed, the fifth regulating valve 23 is open, the sixth regulating valve 24 is open, and the seventh regulating valve 25 is closed. The pressure reducer 26 participates in pressure reduction, lowering the exhaust steam pressure from the small steam turbine No. 5 to match the deaerator inlet steam pressure, which is then channeled to the deaerator inlet steam source. When the unit's electrical load is less than 50% THA, the fourth regulating valve 22 is closed, the fifth regulating valve 23 is open, the sixth regulating valve 24 is closed, and the seventh regulating valve 25 is open. The pressure reducer 26 participates in pressure reduction, lowering the exhaust steam pressure from the small steam turbine No. 5 to match the No. 3 high-temperature feedwater heater inlet steam pressure, which is then channeled to the No. 3 high-temperature feedwater heater inlet steam source. The heating capacity of the coal-fired unit has been increased. During the heating season, the exhaust steam from the small steam turbine 5 can be used as the heat source for the third-stage peak heater 12, which can increase the heating area by about 1 million to 1.5 million square meters.

[0051] When the temperature is high and the heating load demand is low, the steam supply to the third-stage peak heater 12 can be shut off by the fourth regulating valve 22, that is, the steam supply from the small steam turbine 5 to the third-stage peak heater 12 can be shut off, and the heating load can be completed by the high back pressure condenser 27 and the second-stage peak heater 11. When the outside temperature is low and the heat load demand is high, the third-stage peak heater 12 can be started by opening the fourth regulating valve 22 to increase the heating capacity.

[0052] The steam intake of the small steam turbine 5 in the compressed gas production system is determined according to the amount of externally supplied gas products. In some embodiments, when the steam intake of the small steam turbine 5 is small, the amount of steam exhaust from the small steam turbine 5 that needs to be consumed is small. It can be consumed by closing the fourth regulating valve 22 and fully opening the fifth regulating valve 23, or by fully opening the fourth regulating valve 22 and closing the fifth regulating valve 23.

[0053] In other embodiments, when the exhaust steam volume of the small steam turbine 5 is large and a single supply method cannot fully absorb it, it can be absorbed by opening both the fourth regulating valve 22 and the fifth regulating valve 23. The degree of opening of the fourth regulating valve 22 and the fifth regulating valve 23 needs to be determined according to the heating load demand, and priority is given to ensuring that the fourth regulating valve 22 is fully open and the fifth regulating valve 23 is open as a supplementary absorption method.

[0054] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0055] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0056] Although embodiments of the invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.

Claims

1. An energy system for residential heating that couples compressed gas supply and high back pressure multi-stage heating, characterized in that, The thermal power unit includes a boiler assembly, a high-pressure cylinder, an intermediate-pressure cylinder, a low-pressure cylinder, and a regenerative system for condensing steam and resupplying it to the boiler. The regenerative system includes a high back pressure condenser, which is connected to a regenerative water intake pipe for primary heating of the heating return water. The regenerative system includes a No. 3 high-temperature feedwater heater and a deaerator. The intermediate-pressure cylinder is connected to the No. 3 high-temperature feedwater heater and the deaerator by two independent steam return pipes. The exhaust pipe is connected to the two steam return pipes by a normal return pipe so that the steam in the exhaust pipe can return to the regenerative system during the non-heating season. A medium-low pressure connecting pipe is provided between the medium-pressure cylinder and the low-pressure cylinder, and a secondary heating pipe is connected to the medium-low pressure connecting pipe, and a secondary peak heater is connected to the secondary heating pipe. A main steam pipe is provided between the boiler assembly and the high-pressure cylinder. A main diversion pipe is connected to the main steam pipe. A small steam turbine is connected to the main diversion pipe. A compressed gas assembly is driven by the small steam turbine. An exhaust pipe is provided to the small steam turbine. A three-stage peak heater is connected to the heating water supply pipe. The high back pressure condenser, the secondary peak heater, and the tertiary peak heater are sequentially connected by pipelines.

2. The energy system for coupled compressed gas supply and high back pressure multi-stage heating of residential heating as described in claim 1, characterized in that, A third regulating valve is installed downstream of the interface of the medium- and low-pressure connecting pipeline corresponding to the secondary heating pipeline.

3. The energy system for coupled compressed gas supply and high back pressure multi-stage heating of residential heating as described in claim 1, characterized in that, The main diversion pipe is provided with a first check valve, a first regulating valve and a first isolation valve in sequence along the direction from the main steam pipe to the small steam turbine.

4. The energy system for residential heating with coupled compressed gas supply and high back pressure multi-stage heating as described in claim 1, characterized in that, The secondary heating pipe is equipped with a second check valve, a second regulating valve, and a second isolation valve in sequence along the steam flow direction.

5. The energy system for coupled compressed gas supply and high back pressure multi-stage heating of residential heating as described in claim 1, characterized in that, A fourth regulating valve is installed downstream of the exhaust pipe where it connects with the normal return pipe, and a fifth regulating valve is installed on the normal return pipe. A sixth regulating valve is installed on the pipe of the normal return pipe that is connected to the steam return pipe that returns to the deaerator, and a seventh regulating valve is installed on the pipe of the normal return pipe that is connected to the steam return pipe that returns to the No. 3 high-temperature feedwater heater.

6. The energy system for coupled compressed gas supply and high back pressure multi-stage heating of residential heating as described in claim 5, characterized in that, A pressure reducer is installed on the constant return pipe.

7. The energy system for coupled compressed gas supply and high back pressure multi-stage heating of residential heating as described in claim 1, characterized in that, A high back pressure condenser is connected to the outlet of the low-pressure cylinder, and the condensate outlet of the secondary peak heater is connected to the outlet of the high back pressure condenser.

8. The energy system for residential heating with coupled compressed gas supply and high back pressure multi-stage heating as described in claim 1, characterized in that, The regenerative system includes a deaerator, and the condensate outlet of the three-stage peak heater is connected to the inlet of the deaerator.

9. The energy system for residential heating with coupled compressed gas supply and high back pressure multi-stage heating as described in claim 1, characterized in that, The compressed gas assembly includes a first compressor that is driven and connected to the small steam turbine. The compressor is connected to a gas source pipeline, which is connected to a compressed gas source. The outlet of the first compressor is connected to a gas product pipeline.

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