Combined heat and power unit high-low pressure bypass heat supply system

Abstract

This utility model discloses a high- and low-pressure bypass heating system for a combined heat and power (CHP) unit; belonging to the technical field of heating systems; including a boiler body, a high-pressure cylinder, a medium-pressure cylinder, a primary industrial steam pipeline network, a secondary industrial steam pipeline network, a main boiler steam pipeline, a reheat steam pipeline, an original high-pressure bypass, an original low-pressure bypass, a feedwater pump outlet, a boiler reheater, a condenser, heating steam, a condensate pump outlet, a new high-pressure bypass, a new low-pressure bypass, and a matching desuperheating and pressure-reducing system. By optimizing the design of the high- and low-pressure bypass system, flexible diversion and pressure reduction of main steam and reheat steam are achieved, reducing the steam intake of the high- and medium-pressure cylinders. This significantly reduces the unit's electrical load to below 30% of its rated load while meeting industrial heating and residential heating needs. The system effectively alleviates the contradiction between industrial heating, residential heating, and grid peak shaving, improves the unit's operational flexibility and thermoelectric decoupling capability, and provides technical support for the stable operation of the power system and the consumption of new energy sources.

Description

Technical Field

[0001] This utility model relates to the field of heating system technology, specifically to a high and low pressure bypass heating system for combined heat and power units. Background Technology

[0002] In actual operation, combined heat and power (CHP) units typically adopt a "heat-driven power generation" mode. Due to limitations in heating demand, their peak-shaving capacity is insufficient to meet the grid's deep peak-shaving requirements. High- and low-pressure bypass technology can reduce unit load by adjusting steam diversion, but under the combined conditions of large-flow industrial heating and heating, existing bypass systems still suffer from insufficient peak-shaving depth and poor heating stability.

[0003] Patent CN206539378U proposes a deep peak-shaving system for cogeneration units. Through coordinated control of high and low pressure bypasses, it supplies main steam and reheat steam to the heating network after depressurization and cooling, thereby improving heating flexibility. However, the system relies on complex pipelines and multi-stage valves, resulting in insufficient adjustment accuracy when dealing with the combined demands of large industrial flow rates and residential heating, and its adaptability to multiple operating conditions is not optimized.

[0004] Patent CN111288531A discloses an emergency heating system based on high and low pressure bypass combined heating. In this system, the boiler superheater outlet is connected to the high-pressure cylinder steam inlet and the high-pressure bypass desuperheating and pressure reducing valve group steam inlet. The outlet of the high-pressure bypass desuperheating and pressure reducing valve group is connected to the boiler reheater inlet. The high-pressure cylinder outlet and the outlet of the valve group are connected separately after merging. Through a series of processes, when the turbine or generator is under maintenance, the shutdown of the local heating system can be avoided, which would reduce the heating capacity of the entire plant and improve the safety and reliability of the entire plant's heating system.

[0005] Patent CN114646084A discloses a low-pressure bypass heating system. By installing a tee joint and regulating valve after the low-pressure bypass valve, steam is diverted to the heating pipeline, thereby improving the heating capacity of thermal power units. This system optimizes pipeline flow efficiency, reduces the risk of valve leakage, and enhances operational stability. However, the system has a limited function, applicable only to heating scenarios, and does not address multi-stage heating needs such as industrial steam, thus restricting its application scope.

[0006] Patent CN114542219A discloses a low-pressure bypass thermal storage system for a thermal power generator set. By connecting the boiler reheater to the thermal storage device and controlling the steam flow direction using a low-pressure bypass regulating valve, the system achieves deep peak shaving for the unit. This system operates efficiently during both the thermal storage and release phases, reducing energy loss and maintaining thermal efficiency. However, it suffers from drawbacks such as complex system structure, high valve control requirements, and high initial investment, which hinders its practical application and promotion. Compared to traditional solutions, while it improves adjustment flexibility, its economic efficiency still needs optimization.

[0007] Existing technologies show that while high and low pressure bypass technology can improve the peak-shaving capacity of the unit, it still suffers from problems such as insufficient system flexibility and lack of safety of key equipment when large-flow industrial heating and heating demands overlap. Utility Model Content

[0008] To address the aforementioned technical problems, this utility model provides a high and low pressure bypass heating system for cogeneration units. This technical solution solves the problem that although the high and low pressure bypass technology mentioned in the background technology can improve the peak-shaving capacity of the unit, it still suffers from insufficient system flexibility and lack of safety of key equipment when large-flow industrial heating and heating demand overlap.

[0009] To achieve the above objectives, the technical solution adopted by this utility model is as follows: The high and low pressure bypass heating system of the cogeneration unit includes the boiler body, high-pressure cylinder, intermediate-pressure cylinder, primary industrial steam pipeline network, secondary industrial steam pipeline network, main boiler steam pipeline, boiler reheat steam pipeline, original high-pressure bypass, original low-pressure bypass, feedwater pump outlet, boiler reheater, condenser, heating steam, condensate pump outlet, new high-pressure bypass, new low-pressure bypass, and supporting desuperheating and pressure reduction system; the main boiler steam pipeline connects the boiler body and the high-pressure cylinder, and is also connected to the inlets of the original high-pressure bypass and the new high-pressure bypass; the outlets of the original high-pressure bypass and the new high-pressure bypass are divided into two paths, one connected to the cold section of the boiler reheater, and the other passing through the newly added high-pressure bypass... The pipeline is supplied to the primary industrial steam network; the hot section of the boiler reheater is connected to the inlet of the original low-pressure bypass and the new low-pressure bypass, and the outlets of the original low-pressure bypass and the new low-pressure bypass are connected to the heating steam after pressure reduction and temperature reduction by the low-pressure bypass valve, and the other is connected to the condenser; the primary industrial steam network is connected to the boiler main steam pipeline through the new high-pressure bypass to achieve steam supplementation; the secondary industrial steam network is related to other parts of the system, and its steam source or regulation is related to the overall steam distribution of the system; the feedwater pump outlet is connected to the boiler body to supply water to the boiler body; the condensate pump outlet is connected to relevant links in the system for the transportation and treatment of condensate.

[0010] Preferably, the high-pressure cylinder and the intermediate-pressure cylinder are connected by a pipeline to realize the power transfer of steam at different pressure stages, and the high-pressure cylinder and the intermediate-pressure cylinder have a flow linkage relationship with the original high-pressure bypass, the original low-pressure bypass, the new high-pressure bypass, and the new low-pressure bypass during the axial thrust balance process of the steam turbine.

[0011] Preferably, the supporting desuperheating and pressure reducing system is connected to the original high-pressure bypass, the new high-pressure bypass, the original low-pressure bypass, and the new low-pressure bypass, respectively, to desuperheat and reduce the pressure of the corresponding bypass steam, ensuring that the steam parameters meet the requirements of subsequent steam-using equipment or pipeline networks.

[0012] Preferably, the system is equipped with pressure sensors and temperature sensors, which are installed at the locations of primary industrial steam pipelines, secondary industrial steam pipelines, heating steam pipelines, and key steam pipelines in the system. These sensors are used to monitor steam pressure and temperature parameters and to achieve parameter interlocking, ensuring a dynamic balance between heating and peak shaving.

[0013] Preferably, the primary industrial steam pipeline network and the secondary industrial steam pipeline network are independent of each other and are each equipped with a regulating device, which can adjust parameters such as steam flow rate and pressure separately according to industrial steam demand.

[0014] Preferably, the heating steam pipeline is connected through the original low-pressure bypass and the new low-pressure bypass branch, and a control valve is installed at the connection point to control the flow and pressure of the heating steam to meet the heating demand.

[0015] Preferably, the boiler reheater is used to reheat the steam discharged from the high-pressure cylinder and after it has been partially diverted by the original high-pressure bypass and the new high-pressure bypass, so as to improve the steam quality and then deliver it to the inlet of the original low-pressure bypass and the new low-pressure bypass.

[0016] Preferably, the condenser is used in the system to receive part of the steam from the original low-pressure bypass and the new low-pressure bypass, so as to realize steam condensation and maintain system pressure balance and steam circulation.

[0017] Compared with the prior art, this utility model provides a high and low pressure bypass heating system for cogeneration units, which has the following beneficial effects: 1. By optimizing the design of the high and low pressure bypass system, the main steam and reheat steam can be flexibly diverted and depressurized, reducing the steam intake of the high and medium pressure cylinders. This significantly reduces the unit's electrical load to below 30% of the rated load while meeting industrial heating and residential heating needs. The system can effectively alleviate the contradiction between industrial heating, residential heating and grid peak shaving, improve the unit's operational flexibility and thermoelectric decoupling capability, and provide technical support for the stable operation of the power system and the consumption of new energy.

[0018] 2. By optimizing the design of the high and low pressure bypass system, the main steam and reheat steam are flexibly diverted and depressurized, reducing the steam intake of the high and medium pressure cylinders. When meeting heating demand, the unit's electrical load can be reduced to below 30% of the rated load, alleviating the contradiction between heating and peak shaving, improving the unit's flexibility and thermoelectric decoupling capability, and supporting the stability of the power system and the consumption of new energy sources.

[0019] 3. By optimizing the design of the high and low pressure bypass system, the steam parameters and flow rate are precisely controlled to ensure stable output of industrial heating and cooling, reduce energy loss, and achieve a synergistic improvement in heating stability and overall energy efficiency. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the original thermal system; Figure 2 This is a schematic diagram of a combined high-pressure and low-pressure bypass heating system with newly added high-pressure and low-pressure bypasses.

[0021] The diagram is labeled as follows: 1. Boiler body; 2. High-pressure cylinder; 3. Intermediate-pressure cylinder; 4. Primary industrial steam pipeline; 5. Secondary industrial steam pipeline; 6. Main steam pipeline of boiler; 7. Reheat steam pipeline of boiler; 8. Original high-pressure bypass; 9. Original low-pressure bypass; 10. Feedwater pump outlet; 11. Boiler reheater; 12. Condenser; 13. Heating steam; 14. Condensate pump outlet; 15. New high-pressure bypass; 16. New low-pressure bypass. Detailed Implementation

[0022] The following description is intended to disclose the present invention so that those skilled in the art can implement it. The preferred embodiments described below are merely examples, and other obvious variations will occur to those skilled in the art.

[0023] Example 1 Please refer to Figures 1 to 2 As shown, the high and low pressure bypass heating system of the cogeneration unit includes the boiler body 1, high pressure cylinder 2, intermediate pressure cylinder 3, primary industrial steam pipeline network 4, secondary industrial steam pipeline network 5, main boiler steam pipeline 6, boiler reheat steam pipeline 7, original high pressure bypass 8, original low pressure bypass 9, feedwater pump outlet 10, boiler reheater 11, condenser 12, heating steam 13, condensate pump outlet 14, new high pressure bypass 15, new low pressure bypass 16, and supporting desuperheating and pressure reduction system; the main boiler steam pipeline 6 connects the boiler body 1 and the high pressure cylinder 2, and the main boiler steam pipeline 6 is connected to the inlet of the original high pressure bypass 8 and the new high pressure bypass 15; the outlets of the original high pressure bypass 8 and the new high pressure bypass 15 are divided into two paths, one of which is connected to the cold section of the boiler reheater 11. One route is connected to the primary industrial steam network 4 via a newly added high-pressure bypass pipeline; the hot section of the boiler reheater 11 is connected to the inlet of the original low-pressure bypass 9 and the new low-pressure bypass 16. One outlet of the original low-pressure bypass 9 and the new low-pressure bypass 16 is connected to the heating steam 13 after pressure reduction and temperature reduction by the low-pressure bypass valve, and the other route is connected to the condenser 12; the primary industrial steam network 4 and the boiler main steam pipeline 6 are connected to the boiler main steam pipeline 6 through the new high-pressure bypass 15 to achieve steam supplementation; the secondary industrial steam network 5 is related to other parts of the system, and its steam source or regulation is related to the overall steam distribution of the system; the feedwater pump outlet 10 is connected to the boiler body 1 to supply water to the boiler body 1; the condensate pump outlet 14 is connected to relevant links in the system for the transportation and treatment of condensate.

[0024] Those skilled in the art will understand that the main steam generated by the boiler body 1 is transported to the high-pressure cylinder 2 via the boiler main steam pipeline 6, and simultaneously diverted through the original high-pressure bypass 8 and the new high-pressure bypass 15, one path entering the cold section of the boiler reheater 11, and the other path supplementing the primary industrial steam network 4; the steam in the hot section of the boiler reheater 11 is diverted through the original low-pressure bypass 9 and the new low-pressure bypass 16, one path being processed and connected to the heating steam 13, and the other path going to the condenser 12; the feedwater pump outlet 10 supplies water to the boiler, and the condensate pump outlet 14 treats the condensate. By adding high and low pressure bypasses, multi-path steam distribution is achieved, meeting the combined steam needs of industry and heating, and improving system flexibility.

[0025] In addition, the secondary industrial steam supply has two steam sources. One source is the extraction steam from the valve of the third stage diaphragm of the intermediate pressure cylinder of Unit #2. This extraction steam is used in two ways: part of it is used for heating the feedwater of No.3 high pressure heater, and the other part is used as the main source of secondary industrial steam supply. The other source is the reheat hot section pipeline in front of the intermediate pressure main steam valve of Unit #1. After the parameters are adjusted by the desuperheater and pressure reducer, it is connected to the secondary 5 industrial heating network.

[0026] Example 2 Furthermore, the high-pressure cylinder 2 and the intermediate-pressure cylinder 3 are connected by pipelines to realize the power transfer of steam at different pressure stages. In the process of balancing the axial thrust of the steam turbine, the high-pressure cylinder 2 and the intermediate-pressure cylinder 3 have a flow linkage relationship with the original high-pressure bypass 8, the original low-pressure bypass 9, the new high-pressure bypass 15, and the new low-pressure bypass 16.

[0027] Those skilled in the art will understand that the high-pressure cylinder 2 and the intermediate-pressure cylinder 3 are connected by pipelines. Steam performs work at different pressure stages, and when the axial thrust of the turbine is balanced, they form a flow linkage with the original high-pressure bypass 8, the original low-pressure bypass 9, the new high-pressure bypass 15, and the new low-pressure bypass 16, ensuring stable unit operation. This balances the axial thrust of the turbine, avoids equipment wear caused by steam flow fluctuations, and extends the unit's lifespan.

[0028] Example 3 Furthermore, the supporting desuperheating and pressure reducing system is connected to the original high-pressure bypass 8, the new high-pressure bypass 15, the original low-pressure bypass 9, and the new low-pressure bypass 16 respectively to desuperheat and reduce the pressure of the corresponding bypass steam, ensuring that the steam parameters meet the requirements of subsequent steam-using equipment or pipeline networks.

[0029] Those skilled in the art will understand that the supporting desuperheating and pressure reducing system is connected to the original high-pressure bypass 8, the new high-pressure bypass 15, the original low-pressure bypass 9, and the new low-pressure bypass 16 respectively to desuperheat and reduce the pressure of the steam, ensuring that the steam parameters entering each steam-consuming pipeline network meet the requirements. Precise control of steam parameters avoids damage to steam-consuming equipment due to parameter mismatch, thus improving heating safety.

[0030] Example 4 Furthermore, the system is equipped with pressure and temperature sensors, which are installed in the primary industrial steam pipeline network 4, the secondary industrial steam pipeline network 5, the heating steam pipeline 13, and other key steam pipelines of the system. These sensors are used to monitor steam pressure and temperature parameters and to achieve parameter interlocking, ensuring a dynamic balance between heating and peak shaving.

[0031] Those skilled in the art will understand that pressure and temperature sensors are installed in the primary industrial steam pipeline network 4, the secondary industrial steam pipeline network 5, the heating steam pipeline 13, and key steam pipelines to monitor parameters in real time and achieve interlocking, dynamically balancing heating and peak demand. The system response time is reduced to within 15 seconds, heating stability is improved by 40%, and dynamic balance between supply and demand is ensured.

[0032] Example 5 Furthermore, the primary industrial steam pipeline network 4 and the secondary industrial steam pipeline network 5 are independent of each other and are each equipped with a regulating device, which can individually adjust parameters such as steam flow and pressure according to industrial steam demand.

[0033] Those skilled in the art will understand that the primary industrial steam pipeline network 4 and the secondary industrial steam pipeline network 5 are independent of each other, each equipped with a regulating device, which can independently adjust the steam flow and pressure to adapt to different industrial needs. This satisfies diverse industrial steam demands, avoids mutual interference between pipelines, and improves regulation accuracy.

[0034] Example 6 Furthermore, the heating steam 13 pipeline is connected via the original low-pressure bypass 9 and the new low-pressure bypass 16, and a control valve is installed at the connection point to control the flow and pressure of the heating steam 13 to meet the heating demand.

[0035] Those skilled in the art will understand that the heating steam 13 is connected via branches from the original low-pressure bypass 9 and the new low-pressure bypass 16, with control valves installed at the connection points to regulate flow and pressure to match heating demands. Precise control of the heating steam supply ensures stable heating during winter and reduces energy waste.

[0036] Example 7 Furthermore, the boiler reheater 11 is used to reheat the steam discharged from the high-pressure cylinder 2 and partially diverted by the original high-pressure bypass 8 and the new high-pressure bypass 15, thereby improving the steam quality before delivering it to the inlet of the original low-pressure bypass 9 and the new low-pressure bypass 16.

[0037] Those skilled in the art will understand that the boiler reheater 11 reheats the steam discharged from the high-pressure cylinder 2 and diverted through the original high-pressure bypass 8 and the new high-pressure bypass 15, improving its quality before it is delivered to the inlet of the original low-pressure bypass 9 and the new low-pressure bypass 16. This improves steam quality, enhances subsequent steam utilization efficiency, and increases overall energy efficiency by more than 25%. Example 8 Furthermore, the condenser 12 is used in the system to receive part of the steam from the original low-pressure bypass 9 and the new low-pressure bypass 16, thereby achieving steam condensation and maintaining system pressure balance and steam circulation.

[0038] Those skilled in the art will understand that the condenser 12 receives a portion of the steam from the original low-pressure bypass 9 and the new low-pressure bypass 16, and after condensation, maintains system pressure balance and steam circulation. This ensures stable system pressure, promotes steam recycling, and reduces energy consumption.

[0039] The valve in this application is an erosion-resistant, long-life valve. Its technical principle is as follows: Addressing the erosion problem caused by high pressure differential and high flow rate steam, a multi-dimensional structural optimization is employed: A self-aligning spherical sealing structure: The valve core and valve stem are connected in a separate, movable manner. The bottom of the valve core features a spherical guide structure, automatically aligning with a deviation ≤0.1mm. This compensates for the misalignment caused by high-temperature creep of the valve stem, ensuring a tight seal and a leakage rate ≤0.5%. The sealing surface is made of hard alloy weld overlay, resulting in high hardness and improved erosion resistance. An anti-erosion weir is added to the high-pressure bypass valve cage to guide the steam flow away from the sealing surface, reducing direct erosion. A desuperheating water-assisted temperature control structure: The high-pressure desuperheating water uses a double-layer nozzle to form a conical water mist within the silencer cage at the valve seat outlet, improving steam mixing efficiency and temperature control accuracy.

[0040] Intelligent operation mode control strategy based on operating conditions: Based on the real-time operating conditions of the unit, such as the demand for grid peak shaving, the power generation of renewable energy, and the type of heat load (industrial steam or heating steam), the operating mode is intelligently selected and the parameters of the bypass system are optimized, as follows: Industrial heating priority mode: Suitable for scenarios with a large demand for industrial steam during the non-heating season. In this mode, regulation is mainly achieved through the high-pressure bypass. By controlling the opening of the high-pressure bypass valve, the main steam is de-cooled and depressurized before being supplied to the industrial steam pipeline. At the same time, the steam intake of the high- and intermediate-pressure cylinders is reduced, thereby reducing the unit's power generation to meet the peak-shaving requirement of 30% of the rated load.

[0041] Heating peak shaving mode: Suitable for scenarios where residential heating demand is the primary concern during the heating season. Reheat steam is extracted through a low-pressure bypass valve, de-temperatured and depressurized, and then supplied to the heating network. At the same time, the amount of industrial steam supplied is finely adjusted through a high-pressure bypass to ensure the stability of heating.

[0042] Deep peak shaving mode: This mode is suitable for scenarios where the power grid requires deep peak shaving and there are simultaneous industrial and heating demand. In this mode, the high- and low-pressure bypasses work together. The low-pressure bypass provides steam for heating, while the high-pressure bypass supplements the industrial steam with a portion of the main steam, causing the turbine power to decrease. This achieves deep peak shaving below 30% of the rated load while meeting the combined heating demand, thus improving overall energy efficiency.

[0043] The working principle and operation process of this device are as follows: The main steam generated by the boiler body 1 is transported to the high-pressure cylinder 2 through the main steam pipeline 6 to perform work. At the same time, part of the steam is split through the original high-pressure bypass 8 and the new high-pressure bypass 15. One path enters the cold section of the boiler reheater 11, and the other path is supplemented to the primary industrial steam network 4 through the newly added high-pressure bypass pipeline. The steam discharged from the high-pressure cylinder 2 merges with the bypass-split steam and enters the boiler reheater 11 for heating. The hot section steam is transported to the original low-pressure bypass 9 and the new low-pressure bypass 16. One of them is connected to the heating steam 13 after pressure reduction and desuperheating, and is regulated by the control valve. The parameters are fed into the condenser 12 for condensation; the secondary industrial steam network 5 is independently regulated according to the system steam distribution; the feedwater pump outlet 10 supplies water to the boiler body 1, and the condensate pump outlet 14 processes and transports condensate; the system monitors the parameters of the primary industrial steam network 4, the secondary industrial steam network 5, the heating steam 13, and key pipelines in real time through pressure and temperature sensors, and dynamically adjusts the opening of each bypass valve in conjunction with the flow linkage relationship between the high-pressure cylinder 2 and the medium-pressure cylinder 3, so as to achieve deep peak shaving while meeting the industrial and heating steam demand, and ensure the efficient and stable operation of the system.

[0044] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A high-low pressure bypass heating system for a combined heat and power unit, characterized in that, The system includes a boiler body (1), a high-pressure cylinder (2), a medium-pressure cylinder (3), a primary industrial steam pipeline network (4), a secondary industrial steam pipeline network (5), a main boiler steam pipeline (6), a boiler reheat steam pipeline (7), an original high-pressure bypass (8), an original low-pressure bypass (9), a feedwater pump outlet (10), a boiler reheater (11), a condenser (12), heating steam (13), a condensate pump outlet (14), a new high-pressure bypass (15), a new low-pressure bypass (16), and a matching desuperheating and pressure reducing system. The main boiler steam pipeline (6) connects the boiler body (1) and the high-pressure cylinder (2), and the main boiler steam pipeline (6) is connected to the inlets of the original high-pressure bypass (8) and the new high-pressure bypass (15). The outlets of the original high-pressure bypass (8) and the new high-pressure bypass (15) are... Two paths are provided: one path is connected to the cold section of the boiler reheater (11), and the other path is supplemented to the primary industrial steam network (4) via the newly added high-pressure bypass pipeline; the hot section of the boiler reheater (11) is connected to the inlet of the original low-pressure bypass (9) and the new low-pressure bypass (16); one path of the outlet of the original low-pressure bypass (9) and the new low-pressure bypass (16) is connected to the heating steam (13) after pressure reduction and temperature reduction by the low-pressure bypass valve, and the other path is connected to the condenser (12); the primary industrial steam network (4) and the boiler main steam pipeline (6) are connected to the steam supplementation connection through the new high-pressure bypass (15); the feedwater pump outlet (10) is connected to the boiler body (1) to provide water to the boiler body (1); the condensate pump outlet (14) is connected to the relevant links of the system for the transportation and treatment of condensate.

2. The heat supply system according to claim 1, wherein The high-pressure cylinder (2) and the intermediate-pressure cylinder (3) are connected by a pipeline to realize the power transfer of steam at different pressure stages. The high-pressure cylinder (2) and the intermediate-pressure cylinder (3) have a flow linkage relationship with the original high-pressure bypass (8), the original low-pressure bypass (9), the new high-pressure bypass (15), and the new low-pressure bypass (16) during the axial thrust balance process of the steam turbine.

3. The heat supply system according to claim 1, wherein The matching de-temperature and pressure reduction system is connected to the original high-pressure bypass (8), the new high-pressure bypass (15), the original low-pressure bypass (9), and the new low-pressure bypass (16) respectively, to de-temperature and pressure reduce the steam of the corresponding bypass, so as to ensure that the steam parameters meet the requirements of the subsequent steam-using equipment or pipeline network.

4. The heat supply system according to claim 1, wherein The system is equipped with pressure sensors and temperature sensors, which are installed in the primary industrial steam pipeline (4), the secondary industrial steam pipeline (5), the heating steam (13), and the key steam pipelines of the system. They are used to monitor steam pressure and temperature parameters and realize parameter interlocking to ensure the dynamic balance between heating and peak regulation.

5. The heat supply system with high-low pressure bypass of a combined heat and power unit according to claim 1, characterized in that, The primary industrial steam pipeline network (4) and the secondary industrial steam pipeline network (5) are independent of each other and are each equipped with a regulating device, which can adjust the steam flow rate and pressure parameters separately according to the industrial steam demand.

6. The heat supply system according to claim 1, wherein The heating steam (13) pipeline is connected through the original low-pressure bypass (9) and the new low-pressure bypass (16) branches, and a control valve is installed at the connection point to control the flow and pressure of the heating steam (13) to meet the heating demand.

7. The heat supply system according to claim 1, wherein The boiler reheater (11) is used to reheat the steam discharged from the high-pressure cylinder (2) and partially diverted through the original high-pressure bypass (8) and the new high-pressure bypass (15), improve the steam quality, and then deliver it to the inlet of the original low-pressure bypass (9) and the new low-pressure bypass (16).

8. The heat supply system according to claim 1, wherein The condenser (12) is used in the system to receive part of the steam from the original low-pressure bypass (9) and the new low-pressure bypass (16), realize steam condensation, maintain system pressure balance and steam circulation.

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