An energy system that couples compressed gas, multi-stage industrial steam supply, and residential heating.

Abstract

This invention discloses an energy system coupling compressed gas, multi-stage industrial steam supply, and residential heating. A main steam pipeline is connected to a main diversion pipeline, which in turn connects to a small steam turbine. The small steam turbine is driven by a compressed gas assembly. An exhaust pipeline is connected to the small steam turbine, which in turn connects to a low-pressure industrial steam supply pipeline. A high-pressure industrial steam supply pipeline is connected to the main diversion pipeline, and a medium-pressure industrial steam supply pipeline is connected to the hot reheat pipeline. A first pipeline connects the medium-pressure cylinder and the low-pressure cylinder, and a first-stage heating pipeline is connected to this first pipeline. A first-stage heater, connected to a heating return water pipeline, is connected to this first-stage heating pipeline. A second-stage peak heater, connected to the heating water supply pipeline, is connected to the medium-pressure industrial steam supply pipeline. This invention can exceed the original unit's 10% extraction steam flow limit, achieving a stable supply of compressed gas to the unit and increasing the heating capacity of the thermal power unit, while simultaneously realizing multi-stage industrial steam supply.

Description

Technical Field

[0001] This invention relates to the field of energy utilization technology, and in particular to an energy system that couples compressed gas, multi-stage industrial steam supply and 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] 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.

[0004] By utilizing abundant steam resources through coal-fired power units, compressed gas can be produced by driving steam turbines, achieving cogeneration of electricity and gas, which can realize the production of compressed gas with low energy consumption and high economy.

[0005] The steam that can be used to drive the small steam turbine in a coal-fired unit can be selected from main steam, cold reheat steam, and hot reheat steam. Among them, the pressure of cold reheat steam and hot reheat steam is reduced, and the exhaust steam after driving the small steam turbine has a high enthalpy value and low energy efficiency. The exhaust steam pressure after the main steam drives the small steam turbine is between 1 and 2 MPa, which can be well recovered and utilized. However, the amount of main steam extracted is constrained by the overheating of the boiler reheater, and generally the amount of main steam extracted does not exceed 10% of the main steam flow.

[0006] Meanwhile, in current conventional hot reheat and cold reheat steam extraction heating technologies, it is generally difficult for 350MW-class units to simultaneously meet the demand for 200t / h of medium-pressure steam (2-3MPa) and 100t / h of low-pressure steam (1-2MPa). Furthermore, external industrial steam supply often employs desuperheating water methods, resulting in the waste of some high-quality heat energy. If this heat energy were used to heat residential heating water, energy utilization would be highly efficient.

[0007] There is currently a lack of technology that can extract compressed gas from the main steam of thermal power units with a large flow rate, and it has not been possible to realize the large-scale, high-efficiency, and low-cost production of compressed gas products from coal-fired power units. There is also a lack of an energy system that can supply compressed gas products externally and supply residential heating with industrial steam at multiple levels and with a large flow rate. Summary of the Invention

[0008] The present invention aims to at least partially solve one of the technical problems in the related art.

[0009] To achieve the above objectives, the present invention proposes an energy system that couples compressed gas, multi-stage industrial steam supply and residential heating, including a thermal power unit. The thermal power unit includes a boiler assembly, a high-pressure cylinder and an intermediate-pressure cylinder. A main steam pipeline is provided between the boiler assembly and the high-pressure cylinder. A main diversion pipeline is connected to the main steam pipeline. The main diversion pipeline is connected to a small steam turbine. The small steam turbine is driven by a compressed gas assembly.

[0010] The small steam turbine is connected to an exhaust pipe, the main steam pipe is connected to a drive steam pipe, a cold reheat steam pipe is provided between the boiler assembly and the high-pressure cylinder, and the exhaust pipe and the drive steam pipe are connected to each other to form a return pipe and then connected to the cold reheat steam pipe.

[0011] A low-pressure industrial steam supply pipeline is connected to the exhaust pipe, a high-pressure industrial steam supply pipeline is connected to the main diversion pipe, a hot reheat steam pipeline is provided between the boiler assembly and the medium-pressure cylinder, and a medium-pressure industrial steam supply pipeline is connected to the hot reheat pipeline.

[0012] A medium-low pressure connecting pipe is provided between the medium-pressure cylinder and the low-pressure cylinder. A first pipe is provided in parallel with the medium-low pressure connecting pipe between the medium-pressure cylinder and the low-pressure cylinder. A primary heating pipe is connected to the first pipe. A primary heater is connected to the primary heating pipe and is connected to the heating return water pipe. A secondary peak heater is provided on the medium-pressure industrial steam supply pipe and is connected to the heating water supply pipe. The primary heater is connected to the secondary pipe.

[0013] This invention increases the extraction steam flow rate of the main steam pipeline by drawing a new drive steam pipeline and installing an exhaust pipeline on the existing main steam pipeline of the thermal power unit, exceeding the original 10% extraction steam flow rate limit of the unit. This achieves a stable, efficient, and reliable supply of compressed gas to the coal-fired power unit, increases the variety of products sold by the coal-fired unit, and finds a new profit point. Furthermore, it increases the heating capacity of the coal-fired unit during the heating season. During the heating season, by using the exhaust steam from the 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. Simultaneously, by drawing multiple stages of industrial steam supply pipelines on different pipelines, the same thermal power unit can supply high-pressure, medium-pressure, and low-pressure industrial steam.

[0014] Optionally, 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.

[0015] Furthermore, a hot press for mixing the exhaust steam of the small steam turbine and the driving steam is provided at the junction of the exhaust steam pipe and the driving steam pipe. The hot press is connected to both the driving steam pipe and the exhaust steam pipe. The outlet of the hot press is connected to the return pipe. A seventh regulating valve is provided on the return pipe.

[0016] 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.

[0017] Furthermore, a second check valve, a second regulating valve, and a second isolation valve are sequentially installed on the drive steam pipe along the direction from the main steam pipe to the hot press.

[0018] Furthermore, a third check valve, a third regulating valve, and a third isolation valve are sequentially installed along the steam flow direction at the upstream position of the secondary peak heater on the medium-pressure industrial steam supply pipeline.

[0019] Furthermore, a fourth check valve, a fourth regulating valve, and a fourth isolation valve are sequentially installed along the steam flow direction on the primary heating pipe, and a fifth regulating valve is installed on the first pipe downstream of the primary heating pipe interface, and a sixth regulating valve is installed on the medium and low pressure connecting pipe.

[0020] Furthermore, a ninth regulating valve is installed on the main diversion pipeline between the small steam turbine and the high-pressure industrial steam supply pipeline, an eighth regulating valve is installed on the high-pressure industrial steam supply pipeline, a tenth regulating valve is installed on the low-pressure industrial steam supply pipeline, and an eleventh regulating valve is installed on the exhaust pipeline downstream of the connection point of the low-pressure industrial steam supply pipeline.

[0021] Furthermore, the thermal power unit also includes a regenerative system for condensing steam and resupplying it to the boiler. The regenerative system includes a feedwater pump, with a second pipe and a third pipe leading out from the outlet of the feedwater pump. The second pipe is connected to the hot press. A first desuperheating and pressure reducing device is installed on the high-pressure industrial steam supply pipe, and a second desuperheating and pressure reducing device is installed on the medium-pressure industrial steam supply pipe. The third pipe is connected to both the first and second desuperheating and pressure reducing devices by a first branch pipe and a second branch pipe, respectively.

[0022] Furthermore, a twelfth regulating valve is installed on the first branch pipe, and a fourteenth regulating valve is installed on the second branch pipe.

[0023] 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

[0024] 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:

[0025] Figure 1 This is a schematic diagram of the structure of an energy system for coupled compressed gas, multi-stage industrial steam supply and residential heating according to an embodiment of the present invention.

[0026] Explanation of reference numerals in the attached figures:

[0027] 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. First compressor; 14. Second compressor; 15. Hot press; 16. Return pipeline; 17. High-pressure industrial steam supply pipeline; 18. Medium-pressure industrial steam supply pipeline; 19. Low-pressure industrial steam supply pipeline; 20. First desuperheater and pressure reducer; 21. Second desuperheater and pressure reducer; 22. Second pipeline; 23. Third pipeline; 24. First branch pipeline; 25. Second branch pipeline; 26, First check valve; 27, First regulating valve; 28, First isolation valve; 29, Second check valve; 30, Second regulating valve; 31, Second isolation valve; 32, Third check valve; 33, Third regulating valve; 34, Third isolation valve; 35, Fourth check valve; 36, Fourth regulating valve; 37, Fourth isolation valve; 38, Fifth regulating valve; 39, Sixth regulating valve; 40, Seventh regulating valve; 41, Eighth regulating valve; 42, Ninth regulating valve; 43, Tenth regulating valve; 44, Eleventh regulating valve; 45, Twelfth regulating valve; 46, Thirteenth regulating valve; 47, Fourteenth regulating valve; 48, First pipeline. Detailed Implementation

[0028] 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.

[0029] This application provides an energy system that couples compressed gas, multi-stage industrial steam supply, and residential heating, with reference to... Figure 1 The thermal power unit includes a boiler assembly 1, a high-pressure cylinder 2 and an intermediate-pressure cylinder 3. 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. A small steam turbine 5 is connected to the main steam pipe 7. A compressed gas assembly is driven and connected to the small steam turbine 5.

[0030] The small steam turbine 5 is connected to an exhaust pipe 8, the main steam pipe 6 is connected to a drive steam pipe, and a cold reheat steam pipe is provided between the boiler assembly 1 and the high-pressure cylinder 2. The exhaust pipe 8 and the drive steam pipe are connected to merge into a return pipe 16 and then connected to the cold reheat steam pipe. In some embodiments, in order to adjust the steam flow rate in the return pipe 16, a sixth regulating valve 39 is provided on the return pipe 16.

[0031] A low-pressure industrial steam supply pipeline 19 is connected to the exhaust pipe 8, a high-pressure industrial steam supply pipeline 17 is connected to the main diversion pipe 7, a hot reheat steam pipeline is provided between the boiler assembly 1 and the medium-pressure cylinder 3, and a medium-pressure industrial steam supply pipeline 18 is connected to the hot reheat pipeline.

[0032] A medium-low pressure connecting pipe 10 is provided between the medium-pressure cylinder 3 and the low-pressure cylinder 4. A first pipe is provided in parallel between the medium-pressure cylinder 3 and the low-pressure cylinder 4 and the medium-low pressure connecting pipe 10. A primary heating pipe is connected to the first pipe. A primary heater is connected to the primary heating pipe and is connected to the heating return water pipe. A secondary peak heater 11 is provided on the medium-pressure industrial steam supply pipe 18 and is connected to the heating water supply pipe. The primary heater and the secondary peak heater 11 are connected.

[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 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 is located between the outlet of the low-pressure cylinder 4 and the No. 8 low-temperature feedwater heater. A deaerator and 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 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 increases the steam extraction flow rate of the main steam pipeline 6 by drawing a new drive steam pipeline and installing an exhaust pipeline on the existing main steam pipeline 6 of the thermal power unit, exceeding the original 10% extraction flow rate limit of the unit. This achieves a stable, efficient, and reliable supply of compressed gas to the coal-fired power unit, increases the variety of products sold by the coal-fired unit, and finds a new profit point. Furthermore, it increases the heating capacity of the coal-fired unit during the heating season. During the heating season, the exhaust steam from the small steam turbine 5 is used as the heat source for the second-stage peak heater 11, which can increase the heating area by approximately 1-1.5 million square meters. Simultaneously, multiple stages of industrial steam supply pipelines are drawn from different pipelines, thus completing the supply of high-pressure, medium-pressure, and low-pressure industrial steam within the same thermal power unit. Moreover, the multi-stage industrial steam supply can achieve:

[0037] High-pressure industrial steam supply pipeline 17 can supply 3~15MPa high-pressure industrial steam. The industrial steam supply pressure is adjusted to meet the needs of heat users by adding a desuperheating and pressure reducing device.

[0038] The medium-pressure industrial steam supply pipeline 18 can supply 2~3MPa medium-pressure industrial steam. The industrial steam supply pressure is adjusted to meet the needs of heat users by adding a desuperheating and pressure reducing device.

[0039] The low-pressure industrial steam supply pipeline 19 can supply 1~2MPa low-pressure industrial steam. The industrial steam supply pressure is adjusted to meet the needs of heat users by adding a desuperheater and pressure reducer.

[0040] In some embodiments, a first check valve 26, a first regulating valve 27, and a first isolation valve 28 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 26 and the first isolation valve 28 can facilitate system isolation between the main steam pipe 6 and the small steam turbine, and the first regulating valve 27 can effectively control the amount of steam entering the small steam turbine 5.

[0041] In some embodiments, the compressed gas assembly includes a first compressor 13 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 13 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 13 to work under the drive of steam extracted from the main steam pipeline 6. The compressed gas source enters the first compressor 13 along the gas source pipeline, and the gas is output along the gas product pipeline after being compressed by the first compressor 13.

[0042] In some embodiments, the small steam turbine 5 and the first compressor 13 are connected by a steam drive shaft.

[0043] In some embodiments, a second compressor 14 is connected to the gas source pipeline, and the second compressor 14 is an electric compressor. When the thermal power unit or small steam turbine 5 needs maintenance or malfunctions, the second compressor 14 can maintain the gas compression operation normally, thereby ensuring the normal production supply of compressed gas.

[0044] In some embodiments, the exhaust pressure in the exhaust pipe 8 is 1-2 MPa.

[0045] In some embodiments, a hot press 15 for mixing the exhaust steam of the small steam turbine 5 and the driving steam is provided at the connection position between the exhaust steam pipe 8 and the driving steam pipe. The hot press 15 is connected to both the driving steam pipe and the exhaust steam pipe 8, and the outlet of the hot press 15 is connected to the cold reheat steam pipe.

[0046] In some embodiments, a second check valve 29, a second regulating valve 30, and a second isolation valve 31 are sequentially arranged on the drive steam pipeline along the direction from the main steam pipeline 6 to the hot press 15. The second check valve 29 and the second isolation valve 31 facilitate system isolation between the main steam pipeline 6 and the drive steam pipeline, and the second regulating valve 30 effectively controls the amount of steam entering the drive steam pipeline. The hot press 15 can mix and compress the steam in the two pipelines and supply it again to the cold reheat steam pipeline for reheating of the boiler assembly 1, thereby increasing the gas flow rate entering the boiler assembly 1.

[0047] In some embodiments, considering that the steam in the exhaust pipe 8 and the steam in the drive steam pipe enter the hot press 15, the exhaust steam from the small steam turbine is connected to the hot press 15 as the injected steam, and the steam in the drive steam pipe is the driving steam, the two parts of steam need to enter the cold reheat pipe after mixing. However, the temperature and pressure in the cold reheat pipe are low, and the hot press 15 needs to change the pressure and temperature of the two parts of steam to be the same as the steam temperature and pressure in the cold reheat pipe before the steam can be introduced into the cold reheat pipe through the return pipe 16. Therefore, a second pipe 22 is led out from the feed water pump outlet after the deaerator of the regenerative system to supply desuperheating water to the hot press 15. The second pipe 22 is connected to the desuperheating water inlet of the hot press 15, and a portion of the condensate heated at low temperature is supplied to the hot press 15 so that the temperature and pressure reduction of the mixed steam is the same as the steam temperature and pressure in the cold reheat pipe. In addition, in order to facilitate the control of the desuperheating water flow rate in the second pipe 22, a thirteenth regulating valve 46 is provided on the second pipe 22.

[0048] By supplying a portion of the condensate from the regenerative system to the hot press 15 for cold and warm water supply, the process of re-introducing water from the external environment can be reduced, thus reducing the investment of manpower and resources. The exhaust steam from the small turbine is connected to the hot press 15 as the injected steam; the main steam and the small turbine exhaust steam are mixed and blended in the hot press 15, supplemented by a portion of desuperheating water, to adjust the exhaust steam pressure and temperature to match the cold reheat steam temperature and pressure, and then converge at the boiler reheater inlet in boiler assembly 1.

[0049] 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 points. The compressed gas supply guarantee offers high flexibility, significantly improving the operational flexibility of the unit. It also achieves a substantial increase in main steam extraction capacity, exceeding the original 10% extraction flow limit for each unit. A comparison with no steam extraction, traditional steam extraction, and this solution is as follows:

[0050] 1) Under non-extraction conditions, when the main steam flow rate is 1Q, the main steam extraction rate is 0, the total extraction rate of No. 1 high-temperature feedwater heater and No. 2 high-temperature feedwater heater is 0.15Q, and the cold reheat steam is 0.85Q. This inlet flow rate is the safe operating flow rate of boiler component 11 (at this time, the cold reheat steam flow rate is the inlet flow rate of the boiler reheater).

[0051] 2) Traditional steam extraction scheme: When the main steam flow rate is 1Q, the maximum main steam extraction rate is 0.1Q, the total extraction rate of No. 1 high-temperature feedwater heater and No. 2 high-temperature feedwater heater is 0.15Q, and the cold reheat steam is 0.75Q under the condition that the boiler reheater does not overheat (0.75Q is the minimum flow rate for the reheater to not overheat, and at this time the cold reheat steam flow rate is the inlet flow rate of the boiler reheater).

[0052] 3) The present invention can achieve the following when the main steam flow rate is 1Q: 0.2Q steam is extracted to the small turbine, 0.2Q steam is extracted to the drive steam, the total steam extraction of No. 1 high-temperature feedwater heater and No. 2 high-temperature feedwater heater is 0.15Q, the cold reheat steam is 0.55Q, and the boiler reheater inlet flow rate is 0.85Q (the boiler reheater inlet flow rate is equal to the cold reheat steam flow rate plus the mixed steam flow rate).

[0053] In summary, this invention can achieve a large flow rate of main steam extraction, exceeding the original unit's 10% extraction flow rate limit.

[0054] In some embodiments, a third check valve 32, a third regulating valve 33, and a third isolation valve 34 are sequentially arranged along the steam flow direction on the medium-pressure industrial steam supply pipeline 18, located upstream of the secondary peak heater 11. The third check valve 32 and the third isolation valve 34 facilitate system isolation between the two ends of the medium-pressure industrial supply pipeline, and the third regulating valve 33 effectively controls the amount of steam entering the secondary peak heater 11.

[0055] In the medium-pressure industrial steam supply pipeline 18, the extraction pressure is 2-3 MPa when extracting steam from the hot reheat steam pipeline. Due to the setting of the secondary peak heater 11, the extracted steam is reheated in the secondary peak heater 11 to heat the heating water, and the temperature drops, so that it can be closer to the temperature required for industrial steam supply. In addition, considering that the temperature and pressure need to be reduced according to customer needs during industrial steam supply, passing the steam before temperature reduction into the secondary peak heater 11 can also reduce the energy waste of the medium-pressure steam supply pipeline during temperature and pressure reduction before steam supply.

[0056] In some embodiments, a fourth check valve 35, a fourth regulating valve 36, and a fourth isolation valve 37 are sequentially arranged along the steam flow direction on the primary heating pipe. The fourth check valve 35 and the fourth isolation valve 37 can isolate the systems connected at both ends of the primary heating pipe, and the fourth regulating valve 36 can effectively control the amount of steam entering the primary heater. Considering that the primary heating pipe leading out from the first pipe is used to supply steam for residential heating, it is necessary to regulate the amount of steam supplied in the primary heating pipe to avoid the situation where the steam supply from the intermediate pressure cylinder 3 to the low pressure cylinder 4 is diverted during the steam supply process from the first pipe, resulting in insufficient steam supply from the intermediate pressure cylinder 3 to the low pressure cylinder 4, and insufficient steam supply for residential heating. Therefore, a fifth regulating valve 38 is arranged downstream of the primary heating pipe interface on the first pipe, and a sixth regulating valve 39 is arranged on the intermediate and low pressure connecting pipe 10.

[0057] In some embodiments, in order to facilitate flow control of the high-pressure industrial steam supply pipeline 17 and the low-pressure industrial steam supply pipeline 19, a ninth regulating valve 42 is provided on the main diversion pipeline 7 between the small steam turbine 5 and the high-pressure industrial steam supply pipeline 17, an eighth regulating valve 41 is provided on the high-pressure industrial steam supply pipeline 17, a tenth regulating valve 43 is provided on the low-pressure industrial steam supply pipeline 19, and an eleventh regulating valve 44 is provided on the exhaust pipeline 8 downstream of the connection of the low-pressure industrial steam supply pipeline 19.

[0058] In some embodiments, considering that the temperature and pressure of the steam drawn out from the high-pressure industrial steam supply pipeline 17 and the medium-pressure industrial steam supply pipeline 18 are higher than the temperature and pressure required for normal steam supply, the drawn gas needs to be cooled and depressurized before it can be supplied to the corresponding industrial steam supply pipeline. The industrial steam supply pressure needs to be adjusted to meet the needs of the heat users by adding a desuperheating and pressure reducing device. Therefore, a first desuperheating and pressure reducing device 20 is installed on the high-pressure industrial steam supply pipeline 17, and a second desuperheating and pressure reducing device 21 is installed on the medium-pressure industrial steam supply pipeline 18. Considering that desuperheating water is needed to cool and depressurize the steam, supplementing it externally would require additional manpower, resources, and financial investment, increasing costs. Therefore, drawing desuperheating water from the existing thermal power unit is a more preferred solution. The thermal power unit also includes a regenerative system for condensing steam and resupplying it to the boiler. This regenerative system includes a feedwater pump, from which a third pipeline 23 extends. The third pipeline 23 is connected to both the first desuperheating and pressure reducing device 20 and the second desuperheating and pressure reducing device 21, and is connected to a first branch pipeline 24 and a second branch pipeline 25. The desuperheating water in the third pipeline 23 is diverted to the first desuperheating and pressure reducing device 20 and the second desuperheating and pressure reducing device 21 via the first branch pipeline 24 and the second branch pipeline 25, thus enabling the first desuperheating and pressure reducing device 20 and the second desuperheating and pressure reducing device 21 to complete the cooling process.

[0059] In some embodiments, in order to facilitate the adjustment of the desuperheating water flow rate in the first branch pipe 24 and the second branch pipe 25, a twelfth regulating valve 45 is provided on the first branch pipe 24 and a thirteenth regulating valve 46 is provided on the second branch pipe 25.

[0060] In some embodiments, the regenerative system further includes a high back-pressure condenser connected to the outlet of the low-pressure cylinder 4, and the condensate from the primary heater is connected to the outlet pipe of the high back-pressure condenser. The condensate from the primary heater is collected into the regenerative system and used for power generation in the thermal power unit system again.

[0061] The temperature of the heating return water is generally around 45℃. It is heated to around 100℃ in the primary heater and then connected to the secondary peak heater 11 for external heating to around 110℃. The steam in the primary heater is taken from the medium and low pressure connecting pipe, and the condensate at the outlet of the primary heater is collected at the outlet of the high back pressure condenser.

[0062] 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.

[0063] 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.

[0064] 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 coupling compressed gas, multi-stage industrial steam supply and residential heating, characterized in that, The utility model provides a kind of steam turbine unit, including thermal power generating unit, the thermal power generating unit includes boiler assembly, high-pressure cylinder and medium-pressure cylinder, main steam pipe is arranged between the boiler assembly and high-pressure cylinder, main flow pipe is communicated and arranged on the main steam pipe, small steam turbine is communicated with the main flow pipe, and the small steam turbine is drivingly connected with compressed gas assembly; The small steam turbine is communicated and arranged with exhaust pipe, the main steam pipe is communicated and arranged with driving steam pipe, cold reheat steam pipe is arranged between the boiler assembly and the high-pressure cylinder, the exhaust pipe and the driving steam pipe are communicated and arranged with backflow pipe after being communicated and merged, and the backflow pipe is communicated and arranged with the cold reheat steam pipe; The exhaust pipe is communicated and arranged with low-pressure industrial steam supply pipe, the main flow pipe is arranged with high-pressure industrial steam supply pipe, hot reheat steam pipe is arranged between the boiler assembly and medium-pressure cylinder, and the hot reheat pipe is communicated and arranged with medium-pressure industrial steam supply pipe; The medium-pressure cylinder and low-pressure cylinder are arranged with medium-low pressure communication pipe, the first pipe is arranged in parallel between the medium-pressure cylinder and the low-pressure cylinder and the medium-low pressure communication pipe, the first pipe is communicated and arranged with first heating pipe, the first heating pipe is communicated and arranged with first heater communicated with heating return water pipe, the medium-pressure industrial steam supply pipe is arranged with second peak heater communicated with heating water supply pipe, and the first heater is communicated and arranged with the second pipe.

2. An energy system for coupling compressed gas, multi-stage industrial steam supply and residential heating as claimed in claim 1, characterized in that, The compressed gas assembly includes the first compressor drivingly connected with the small steam turbine, the compressor is communicated with gas source pipe, the gas source pipe is communicated and arranged with compressed gas source, and the first compressor outlet is communicated with gas product pipe.

3. An energy system for coupling compressed gas, multi-stage industrial steam supply and residential heating as described in claim 1, wherein, The exhaust pipe and the driving steam pipe are arranged with heat press for mixing small steam turbine exhaust steam and driving steam at the merging position, the heat press is communicated and arranged with the driving steam pipe and the exhaust pipe, the heat press outlet is communicated and arranged with the backflow pipe, and the backflow pipe is arranged with seventh regulating valve.

4. An energy system for coupling compressed gas, multi-stage industrial steam supply and residential heating as described in claim 1, wherein, The main flow pipe is sequentially arranged with first non-return valve, first regulating valve and first isolation valve in the direction from the main steam pipe to the small steam turbine.

5. An energy system for coupling compressed gas, multi-stage industrial steam supply and residential heating as described in claim 3, wherein, The driving steam pipe is sequentially arranged with second non-return valve, second regulating valve and second isolation valve in the direction from the main steam pipe to the heat press.

6. An energy system for coupling compressed gas, multi-stage industrial steam supply and residential heating as described in claim 1, wherein, The medium-pressure industrial steam supply pipe is sequentially arranged with third non-return valve, third regulating valve and third isolation valve in the direction of steam flow at the position upstream of the second peak heater.

7. An energy system for coupling compressed gas, multi-stage industrial steam supply and residential heating as described in claim 1, wherein, The first heating pipe is sequentially arranged with fourth non-return valve, fourth regulating valve and fourth isolation valve in the direction of steam flow, the first pipe is arranged with fifth regulating valve at the position downstream of the first heating pipe interface, and the medium-low pressure communication pipe is arranged with sixth regulating valve.

8. An energy system for coupling compressed gas, multi-stage industrial steam supply and residential heating as described in claim 1, wherein, The main flow pipe is arranged with ninth regulating valve between the small steam turbine and the high-pressure industrial steam supply pipe, the high-pressure industrial steam supply pipe is arranged with eighth regulating valve, the low-pressure industrial steam supply pipe is arranged with tenth regulating valve, and the exhaust pipe is arranged with eleventh regulating valve at the position downstream of the low-pressure industrial steam supply pipe connection.

9. An energy system for coupling compressed gas, multi-stage industrial power supply and residential heating as described in claim 3, wherein, The thermal power generating unit further comprises a heat recovery system for feeding the steam condensate back to the boiler, the heat recovery system comprising a feed water pump, a second pipeline and a third pipeline being led out at the outlet of the feed water pump, the second pipeline being in communication with the heat press, a first desuperheater and pressure reducer being arranged on the high-pressure industrial steam supply pipeline, a second desuperheater and pressure reducer being arranged on the medium-pressure industrial steam supply pipeline, the third pipeline being in communication with the first desuperheater and pressure reducer and the second desuperheater and pressure reducer respectively, and first and second branch pipelines being arranged in the third pipeline.

10. An energy system for coupling compressed gas, multi-stage industrial steam supply and residential heating as described in claim 9, wherein, A twelfth regulating valve is arranged on the first branch pipeline, and a fourteenth regulating valve is arranged on the second branch pipeline.

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