Multi-stage heating system for residential heating with coupling of compressed gas and low-pressure cylinder zero output

Abstract

The application discloses a kind of coupling compressed gas and low pressure cylinder zero output multistage heating resident heating system, including thermal power unit, middle-low pressure communication pipeline is arranged between middle pressure cylinder and low pressure cylinder, and middle-low pressure communication pipeline is communicated and is provided with a first heating pipeline, the first heating pipeline is communicated and is provided with first heater with heating return water pipeline communication, boiler assembly is arranged with main steam pipeline between high pressure cylinder, main steam pipeline is communicated and is provided with main flow guide pipeline, main flow guide pipeline is communicated with small steam turbine, small steam turbine is drivingly connected with compressed gas assembly, small steam turbine is provided with exhaust pipe, exhaust pipe is communicated and is provided with secondary peak heater with heating water supply pipeline communication, first heater and secondary peak heater pipeline are communicated and are provided with.The application realizes that thermal power unit is stable, efficient, reliable supply compressed gas, increases coal-fired unit heating capacity, and can increase heating area about 100-150 million square meters.

Description

Technical Field

[0001] This invention relates to the field of energy utilization technology, and in particular to a multi-stage heating residential heating system that couples compressed gas and a low-pressure cylinder with zero output. 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 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, this invention proposes a multi-stage heating residential heating system coupling compressed gas and zero-output low-pressure cylinder, comprising a thermal power unit. 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. A medium-low pressure connecting pipe is provided between the medium-pressure cylinder and the low-pressure cylinder, and a primary heating pipe is connected to the medium-low pressure connecting pipe. The primary heating pipe is connected to a primary heater connected to a heating return water pipe. A main steam pipe is provided between the boiler assembly and the high-pressure cylinder, and a main diversion pipe is connected to the main steam pipe. The main diversion pipe is connected to a small steam turbine, which is driven by a compressed gas assembly. The small steam turbine is provided with an exhaust pipe, which is connected to a secondary peak heater connected to a heating water supply pipe. The primary heater and the secondary peak heater are connected by a pipe.

[0008] This invention enables a stable, efficient, and reliable supply of compressed gas to coal-fired power units, increasing the variety of products available for sale and identifying new profit centers. It also increases the heating capacity of coal-fired units; during the heating season, by using exhaust steam from a small steam turbine as a heat source for the second-stage peak heater, the heating area can be increased by approximately 1-1.5 million square meters.

[0009] Optionally, a first pipe is provided in parallel between the medium-pressure cylinder outlet and the low-pressure cylinder inlet of the medium-low pressure connecting pipe, a fourth regulating valve is provided on the first pipe, and a third regulating valve is provided on the medium-low pressure connecting pipe.

[0010] 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.

[0011] Furthermore, a first check valve, a first regulating valve, and a first isolation valve are sequentially installed along the main steam pipeline from the main steam pipeline to the small steam turbine.

[0012] Furthermore, a second check valve, a second regulating valve, and a second isolation valve are sequentially installed along the steam flow direction on the primary heating pipe.

[0013] Furthermore, a fifth regulating valve is installed downstream of the exhaust pipe where it connects with the normal return pipe, and a sixth regulating valve is installed on the normal return pipe. 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 deaerator, and an eighth 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.

[0014] Furthermore, a pressure reducer is installed on the constant return pipe.

[0015] Furthermore, a condenser is connected to the outlet of the low-pressure cylinder, and the condensate outlet of the first-stage heater is connected to the outlet of the condenser.

[0016] Furthermore, the regenerative system includes a deaerator, and the condensate outlet of the secondary peak heater is connected to the inlet of the deaerator.

[0017] 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.

[0018] 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

[0019] 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: Figure 1 This is a schematic diagram of a multi-stage heating residential heating system with coupled compressed gas and zero output of a low-pressure cylinder, according to an embodiment of the present invention.

[0020] Explanation of reference numerals in the attached figures: 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. Primary heating pipeline; 10. Medium and low-pressure connecting pipeline; 11. Primary heater; 12. Secondary peak heater; 13. Constant return pipeline; 14. First compressor; 15. Second compressor; 16. First check valve; 17. First regulating valve; 18. First isolation valve; 19. Second check valve; 20. Second regulating valve; 21. Second isolation valve; 22. Third regulating valve; 23. Fourth regulating valve; 24. Fifth regulating valve; 25. Sixth regulating valve; 26. Seventh regulating valve; 27. Eighth regulating valve; 28. First pipeline; 29. ​​Pressure reducer. Detailed Implementation

[0021] 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.

[0022] This invention provides a multi-stage heating residential heating system that couples compressed gas and a low-pressure cylinder with zero output, referring to... Figure 1 The system includes a thermal power unit, which comprises 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. A medium-low pressure connecting pipe 10 is provided between the intermediate-pressure cylinder 3 and the low-pressure cylinder 4, and a primary heating pipe 9 is connected to the medium-low pressure connecting pipe 10. The primary heating pipe 9 is connected to a primary heater 11 connected to the heating return water pipe. 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. The main diversion pipe 7 is connected to a small steam turbine 5. The small steam turbine 5 is driven by a compressed gas assembly. The small steam turbine 5 is provided with an exhaust pipe 8. The exhaust pipe 8 is connected to a secondary peak heater 12 connected to the heating supply water pipe. The primary heater 11 and the secondary peak heater 12 are connected by a pipe.

[0023] 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 condenser at low temperature.

[0024] The high-temperature feedwater heaters No. 1 to No. 3 are connected to the high-pressure cylinder 2 and the medium-pressure cylinder 3 respectively. The high-temperature feedwater heaters No. 5 to No. 8 are all connected to the low-pressure cylinder 4. The condenser is located between the outlet of the low-pressure cylinder 4 and the low-temperature feedwater heater No. 8. A deaerator and a feedwater pump are installed between the high-temperature feedwater heaters No. 3 and No. 5. The high-temperature feedwater heater No. 1 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 high-temperature feedwater heaters No. 1 and No. 2 respectively. The other steam outlet of the medium-pressure cylinder 3 is connected to the high-temperature feedwater heater No. 3. The high-temperature feedwater heaters No. 1 to No. 3 and the deaerator feedwater assembly are connected in sequence by a return pipe. The low-temperature feedwater heaters No. 5 to No. 8 and the condenser are also connected in sequence by a return pipe.

[0025] 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.

[0026] This invention increases the steam extraction flow rate of the main steam pipeline 6 by drawing a new drive steam pipeline and installing an exhaust steam pipeline 8 on the existing main steam pipeline 6 of the coal-fired power unit. This exceeds the original 10% extraction flow rate limit of the unit, enabling a stable, efficient, and reliable supply of compressed gas to the coal-fired power unit. This also expands the product range of the coal-fired unit and identifies new profit points. Furthermore, it increases the heating capacity of the coal-fired unit during the heating season. By using the exhaust steam from the small steam turbine 5 as a heat source for the second-stage peak heater 12, the heating area can be increased by approximately 1 million to 1.5 million square meters.

[0027] In some embodiments, a first check valve 16, a first regulating valve 17, and a first isolation valve 18 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 16 and the first isolation valve 18 can facilitate system isolation between the main steam pipe 6 and the small steam turbine, and the first regulating valve 17 can effectively control the amount of steam entering the small steam turbine 5.

[0028] 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 to work under the drive of steam extracted from the main steam pipeline 6. The compressed gas source enters the first compressor 14 along the gas source pipeline, and the gas is output along the gas product pipeline after being compressed by the first compressor 14.

[0029] In some embodiments, the small steam turbine 5 is connected to the compressor via a steam drive shaft.

[0030] In some embodiments, a second compressor 15 is connected to the gas source pipeline, and the second compressor 15 is an electric compressor. When the thermal power unit or small steam turbine 5 needs maintenance or malfunctions, the second compressor 15 can maintain the gas compression operation normally, thereby ensuring the normal production supply of compressed gas.

[0031] 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.

[0032] In some embodiments, considering that a primary heating pipe for heating is led out from the medium-low pressure connecting pipe 10 to supply steam for residential heating, it is necessary to adjust the steam supply in the primary heating pipe to avoid the situation where the steam supply from the medium-pressure cylinder 3 to the low-pressure cylinder 4 is diverted during the process of supplying steam from the medium-low pressure connecting pipe 10, resulting in insufficient steam supply from the medium-pressure cylinder 3 to the low-pressure cylinder 4 and insufficient steam supply for residential heating, so that the low-pressure cylinder 4 does not participate in the heating steam supply. Therefore, a first pipe 28 is provided in parallel between the outlet of the medium-pressure cylinder 3 and the inlet of the low-pressure cylinder 4 in the medium-low pressure connecting pipe 10. A fourth regulating valve 23 is provided on the first pipe 28, and a third regulating valve 22 is provided on the medium-low pressure connecting pipe 10.

[0033] In some embodiments, a second check valve 19, a second regulating valve 20, and a second isolation valve 21 are sequentially arranged along the steam flow direction on the primary heating pipe 9. The arrangement of the second check valve 19 and the second isolation valve 21 can facilitate system isolation of the system connected at both ends of the primary heating pipe 9, and the second regulating valve 20 can effectively control the amount of steam entering the primary heater 11.

[0034] In some embodiments, during the non-heating season, the small steam turbine 5 does not need to serve as a heat source for the third peak heater to provide heating for residents. Instead, the exhaust steam needs to be returned to the regenerative system for deaeration and heating. Therefore, the regenerative system includes a No. 3 high-temperature feedwater heater and a deaerator. Two independent steam return pipes are respectively connected between the intermediate-pressure cylinder 3 and the No. 3 high-temperature feedwater heater and the deaerator. The exhaust pipe 8 is connected to the two steam return pipes by a permanent return pipe 13, so that the steam in the exhaust pipe 8 can be returned to the regenerative system during the non-heating season.

[0035] 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 29 is installed near the inlet of the constant return pipe 13.

[0036] In some embodiments, a fifth regulating valve 24 is provided downstream of the location where the exhaust pipe 8 is connected to the normal return pipe 13, and a sixth regulating valve 25 is provided on the normal return pipe 13. A seventh regulating valve 26 is provided on the pipe of the normal return pipe 13 corresponding to the steam return pipe connected to the deaerator, and an eighth regulating valve 27 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.

[0037] In some embodiments, a condenser is connected to the outlet of the low-pressure cylinder 4, and the condensate outlet of the primary heater 11 is connected to the outlet of the condenser. This is used to discharge the condensate from the primary heater 11 to the return system. Since the heating return water temperature is generally around 45°C, it needs to be heated to around 100°C in the primary heater 11 before being connected to the secondary peak heater 12 for further heating before being supplied externally. Therefore, the condensate temperature after steam enters and heat exchange in the heater is relatively low, and it needs to be first heated by flowing into the low-temperature feedwater heater through the condenser outlet.

[0038] In some embodiments, the regenerative system includes a deaerator, and the condensate outlet of the secondary peak heater 12 is connected to the deaerator inlet. This deaerator is used to discharge the condensate from the secondary peak heater 12 into the return system. The heating water in the secondary peak heater 12 needs to be heated to approximately 110°C. Therefore, the temperature of the condensate in the secondary peak heater 12 does not decrease significantly after heat exchange, and it can be directly deaerated and supplied to the high-temperature feedwater heater for further heating.

[0039] The heating return water (temperature generally around 45℃) is heated to around 100℃ in the primary heater 11, and then supplied externally (around 110℃) after being connected to the secondary peak heater 12. The steam in the primary heater 11 is taken from the medium and low pressure connecting pipe. The second regulating valve 20, the third regulating valve 22 and the fourth regulating valve 23 participate in regulating the steam extraction rate. The condensate at the outlet of the primary heater 11 is collected to the condenser outlet. The steam in the secondary peak heater 12 is taken from the exhaust steam of the small steam turbine 5. The condensate at the outlet of the secondary peak heater 12 is collected to the deaerator inlet (the condensate temperature and pressure are matched with the return water temperature and pressure at the deaerator inlet).

[0040] 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 fifth regulating valve 24 is closed, the sixth regulating valve 25 is open, the seventh regulating valve 26 is open, and the eighth regulating valve 27 is closed. The pressure reducer 29 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 fed into the deaerator inlet steam source. When the unit's electrical load is less than 50% THA, the fifth regulating valve 24 is closed, the sixth regulating valve 25 is open, the seventh regulating valve 26 is closed, and the eighth regulating valve 27 is open. The pressure reducer 29 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 fed into 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 second-stage peak heater 12, which can increase the heating area by about 1 million to 1.5 million square meters.

[0041] When the temperature is high and the heating load demand is low, the steam supply to the second-stage peak heater 12 can be shut off by the fifth regulating valve 24, that is, the steam supply from the small steam turbine 5 to the second-stage peak heater 12 can be shut off, and the heating load can be completed by the first-stage peak heater. When the outside temperature is low and the heating load demand is high, the second-stage heater can be started by opening the fifth regulating valve 24 to increase the heating capacity.

[0042] 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. This can be consumed by closing the fifth regulating valve 24 and fully opening the sixth regulating valve 25, or by fully opening the fifth regulating valve 24 and closing the sixth regulating valve 25. In other embodiments, when the exhaust 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 fifth regulating valve 24 and the sixth regulating valve 25. The degree of opening of the fifth regulating valve 24 and the sixth regulating valve 25 needs to be determined according to the heating load demand, and priority should be given to ensuring that the fifth regulating valve 24 is fully open and the sixth regulating valve 25 is open as a supplementary absorption method.

[0043] 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.

[0044] 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.

[0045] 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. A multi-stage heating residential heating system coupling compressed gas and zero-output low-pressure cylinder, characterized in that, The system includes a thermal power unit, comprising 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. A medium-low pressure connecting pipe is provided between the intermediate-pressure cylinder and the low-pressure cylinder, and a primary heating pipe is connected to the medium-low pressure connecting pipe. A primary heater connected to the primary heating pipe and a heating return water pipe is provided. A main steam pipe is provided between the boiler assembly and the high-pressure cylinder, and a main diversion pipe is connected to the main steam pipe. The main diversion pipe is connected to a small steam turbine, which is driven by a compressed gas assembly. The small steam turbine has an exhaust pipe, which is connected to a secondary peak heater connected to the heating water supply pipe. The primary heater and the secondary peak heater are connected by a pipe. 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.

2. The multi-stage heating residential heating system with coupled compressed gas and zero output of the low-pressure cylinder as described in claim 1, characterized in that, The medium-low pressure connecting pipeline is provided with a first pipeline in parallel between the outlet of the medium-pressure cylinder and the inlet of the low-pressure cylinder. A fourth regulating valve is provided on the first pipeline, and a third regulating valve is provided on the medium-low pressure connecting pipeline.

3. The multi-stage heating residential heating system with coupled compressed gas and zero output of the low-pressure cylinder 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 multi-stage heating residential heating system with coupled compressed gas and zero output of the low-pressure cylinder as described in claim 1, characterized in that, The primary 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 multi-stage heating residential heating system with coupled compressed gas and zero output of the low-pressure cylinder as described in claim 1, characterized in that, The exhaust pipe is equipped with a fifth regulating valve downstream of the position where it connects with the normal return pipe, and a sixth regulating valve is installed on the normal return pipe. The normal return pipe is equipped with a seventh regulating valve on the pipe that is connected to the steam return pipe that returns to the deaerator, and an eighth regulating valve is installed on the pipe that is connected to the steam return pipe that returns to the No. 3 high-temperature feedwater heater.

6. The multi-stage heating residential heating system with coupled compressed gas and zero output of the low-pressure cylinder as described in claim 5, characterized in that, A pressure reducer is installed on the constant return pipe.

7. The multi-stage heating residential heating system with coupled compressed gas and zero output of the low-pressure cylinder as described in claim 1, characterized in that, A condenser is connected to the outlet of the low-pressure cylinder, and the condensate outlet of the first-stage heater is connected to the outlet of the condenser.

8. The multi-stage heating residential heating system with coupled compressed gas and zero output of the low-pressure cylinder as described in claim 1, characterized in that, The regenerative system includes a deaerator, and the condensate outlet of the secondary peak heater is connected to the inlet of the deaerator.

9. The multi-stage heating residential heating system with coupled compressed gas and zero output of the low-pressure cylinder 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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