Double-reduction arrangement system for wide-area load adjustment of heat supply pipe network and use method of double-reduction arrangement system

Abstract

The invention discloses a double-reduction arrangement system for wide-area load adjustment of a heat supply pipe network and a using method of the double-reduction arrangement system. The double-reduction arrangement system comprises a high-pressure steam extraction module used for leading out high-pressure steam from reheating hot section outlets of two units respectively; the large-flow temperature and pressure reduction module is connected to the downstream of the high-pressure steam extraction module and used for reducing the high-pressure steam to low-pressure heat supply parameters; the bypass temperature and pressure reduction module and the large-flow temperature and pressure reduction module are connected to the downstream of the high-pressure steam extraction module in parallel, and the bypass temperature and pressure reduction module is used for providing small-flow stable heat supply under the low-load working condition; the large-flow channel and the bypass small-flow channel are connected to the downstream of the same high-pressure steam extraction module in parallel, continuous load adjustment is achieved, the problems of oscillation, scouring and overtemperature of the opening degree of a traditional single valve in a low-load area are solved, and the coverage of the large-flow channel is 50-300 t / h; the bypass small-flow channel covers 5-50 t / h, and the bypass small-flow channel and the bypass small-flow channel are connected in parallel and converged into the same heat supply header, so that a rated load continuous adjustable interval is formed, and the problem of night tilt is solved; and the problems of single valve oscillation, overtemperature and forced supply stop in the time period of 10 t / h are solved.

Description

Technical Field

[0001] This invention relates to a dual-reduction arrangement system for wide-area load adjustment of heating pipe networks and its usage method. Background Technology

[0002] Upgrading the steam source for heating is a key technical means to enhance the heating capacity of coal-fired units, realize combined heat and power, and achieve flexible peak shaving. Its importance is becoming increasingly prominent, especially against the backdrop of deep peak shaving in the current power system and the continuous growth of industrial heating demand.

[0003] Currently, the heating steam source consists of a single unit supplying steam to the hot reheat and cold reheat extraction ports, which serve as backups for each other. However, the steam supply capacities of the hot reheat and cold reheat differ significantly, resulting in a large workload for adjustments and unstable pipeline operation. When heat users experience discontinuous steam consumption, with significant differences between daytime and nighttime usage, the maximum daytime consumption of approximately 50 t / h exceeds the upper limit of the cold reheat steam supply. At night, the flow rate is too low to meet the minimum operating load of the hot reheat. The original steam extraction capacity of the cold reheat section of the unit is insufficient to meet the heating demand (the maximum external steam extraction capacity of a single unit is approximately 50 t / h). Exceeding the allowable cold reheat steam extraction capacity will cause the boiler reheater to overheat. Summary of the Invention

[0004] To overcome the shortcomings of existing technologies, this invention provides a dual-reduction arrangement system for wide-area load adjustment in heating networks and its usage method. A high-flow-rate channel and a bypass low-flow-rate channel are connected in parallel downstream of the same high-pressure extraction module, achieving continuous load adjustment and eliminating the problems of oscillation, scouring, and overheating caused by traditional single valves in low-load areas. The high-flow-rate channel covers 50-300 t / h; the bypass low-flow-rate channel covers 5-50 t / h. Both are connected in parallel to the same heating header, forming a continuously adjustable range for the rated load. This solves the problems of single-valve oscillation, overheating, and forced shutdown during nighttime periods <10 t / h, achieving uninterrupted operation across day and night peak-valley differences. The first and second units form a dual-unit parallel structure, with their outlets converging at the same heating header. When one unit is under maintenance, the other unit can cover the entire heat load, improving system availability.

[0005] To solve the above-mentioned technical problems, the present invention provides the following technical solution: a dual-reduction arrangement system for wide-area load adjustment of heating pipe networks, comprising: The high-pressure steam extraction module is used to extract high-pressure steam from the reheat hot section outlets of the two units respectively; The high-flow-rate desuperheating and pressure-reducing module is connected downstream of the high-pressure steam extraction module and is used to reduce the high-pressure steam to low-pressure heating parameters. The bypass desuperheating and pressure reducing module is connected in parallel with the high-flow desuperheating and pressure reducing module downstream of the high-pressure extraction module, and is used to provide stable heating with a small flow rate under low load conditions. The high-pressure desuperheating water module supplies desuperheating water to both the high-flow desuperheating and pressure-reducing module and the bypass desuperheating and pressure-reducing module. The low-pressure steam collection and distribution module collects the low-pressure steam from the outlets of the high-flow desuperheating and pressure-reducing module and the bypass desuperheating and pressure-reducing module, and distributes it to different users. The outlets of the high-flow-rate desuperheating and pressure-reducing module and the bypass desuperheating and pressure-reducing module are connected to the heating manifold of the low-pressure steam distribution module; the high-pressure desuperheating water module is connected to the desuperheating water inlet of the high-flow-rate desuperheating and pressure-reducing module and the bypass desuperheating and pressure-reducing module through the desuperheating water header and branch pipes respectively.

[0006] As a preferred embodiment of the present invention, the high-pressure steam extraction module includes: The high-pressure main pipeline is connected at one end to the outlet header of the boiler reheat section and at the other end to the inlet of the high-flow desuperheater. The high-pressure bypass branch pipe is led out from the high-pressure main pipeline at one end through a tee, and the other end is connected to the inlet of the low-flow bypass desuperheating and pressure reducing device.

[0007] As a preferred embodiment of the present invention, the high-flow-rate cooling and pressure-reducing module includes: A high-flow desuperheating and pressure-reducing device, with its inlet connected to the high-pressure main pipeline and its outlet connected to the first low-pressure steam distribution pipeline; The desuperheating water inlet of the high-flow desuperheating and pressure-reducing device is connected to the desuperheating water main pipe.

[0008] As a preferred embodiment of the present invention, the low-flow bypass cooling and pressure reduction module includes: The small flow bypass desuperheating and pressure reducing device has its inlet connected to the high pressure bypass branch pipe and its outlet connected to the first low pressure steam collection pipe. The desuperheating water inlet of the small flow bypass desuperheating and pressure reducing device is connected to a desuperheating water branch pipe, and one end of the desuperheating water branch pipe is connected to the desuperheating water main pipe. Isolation gate valves are installed before and after the small flow bypass desuperheating and pressure reducing device.

[0009] As a preferred embodiment of the present invention, the high-pressure desuperheating water module includes: The desuperheating water main pipe is connected to the middle tap of the water supply pump at one end and to the desuperheating water branch pipe at the other end. Both the cooling water main pipe and the cooling water branch pipe are equipped with a first electric gate valve and a temperature regulating valve.

[0010] As a preferred embodiment of the present invention, the low-pressure steam collection and distribution module includes: The heating header is connected to the first low-pressure steam collection pipeline at the inlet and to the second and third low-pressure steam collection pipelines at the outlet. The outlets of the second and third low-pressure steam collection pipelines are connected to different user areas, and both the second and third low-pressure steam collection pipelines are equipped with a second electric gate valve and a flow meter.

[0011] As a preferred embodiment of the present invention, the bottom of the heating manifold is provided with a drain valve and a liquid level indicator.

[0012] As a preferred embodiment of the present invention, the high-pressure extraction module, the high-flow desuperheating and pressure reducing module, and the bypass desuperheating and pressure reducing module are all completely installed on the side of the second unit, forming a dual-unit complementary structure parallel to the first unit.

[0013] As a preferred embodiment of the present invention, one end of the high-pressure main pipeline on the machine side is connected to the reheat hot section outlet of the second boiler, and the other end is connected to the high-flow desuperheating and pressure reducing device and the low-flow bypass desuperheating and pressure reducing device, respectively.

[0014] How to use the dual-reduction layout system for wide-area load adjustment in heating pipe networks: S1. Check the valve status, confirm that the gate valves before and after the large flow desuperheating and pressure reducing device are open, confirm that the gate valves before and after the small flow bypass desuperheating and pressure reducing device are closed, confirm that the first electric gate valve and temperature regulating valve on the desuperheating water main pipe and branch pipe are closed, open the drain valve at the bottom of the heating manifold, drain the condensate, and close it after the liquid level indicator is normal. S2. Slowly open the main gate valve on the high-pressure main pipeline to supply steam to the high-flow desuperheating and pressure reducing device, open the first electric gate valve on the desuperheating water header, start the temperature regulating valve, control the desuperheating water flow rate, and make the outlet steam temperature reach the low-pressure heating parameters. S3. The low-pressure steam after de-temperature and pressure reduction enters the heating header through the first low-pressure steam collection pipeline. According to user needs, the second electric gate valve on the second or third low-pressure steam collection pipeline is opened, the flow meter is adjusted to the target flow, and the pressure, temperature and liquid level of the heating header are monitored in real time to ensure stable operation. S4. Slowly close the gate valves before and after the high-flow desuperheating and pressure reducing device, stop the main module operation, open the gate valve on the high-pressure bypass branch pipe and the isolation gate valves before and after the low-flow bypass desuperheating and pressure reducing device, and adjust the desuperheating water flow through the first electric gate valve and the temperature regulating valve to ensure stable outlet steam parameters. S5. Small flow of steam enters the heating header through the first low-pressure steam collection pipeline and continues to supply heat to users; S6. Repeat steps S1 and S2 to start the high-pressure extraction module and high-flow desuperheating and pressure reducing module on the second unit side, and also merge its outlet steam into the same heating header to achieve steam complementarity between the two units.

[0015] Compared with existing technologies, the beneficial effects of this invention are as follows: the large flow channel and the bypass small flow channel are connected in parallel downstream of the same high-pressure extraction steam module, realizing continuous load regulation and eliminating the problems of oscillation, scouring and overheating of the traditional single valve opening in the low load area. The large flow channel covers 50-300 t / h; the bypass small flow channel covers 5-50 t / h. The two are connected in parallel into the same heating header, forming a continuously adjustable range of rated load. This solves the problems of single valve oscillation, overheating and forced shutdown during the nighttime period of <10 t / h, realizing uninterrupted operation between day and night peak and valley differences. The first unit and the second unit form a dual-unit parallel structure, and the outlets of the two units converge into the same heating header. When one unit is under maintenance, the other unit can cover the entire heat load, improving the system availability. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall system of the present invention; Figure 2 For the present invention Figure 1 A schematic diagram of the magnified system at point A; Figure 3 For the present invention Figure 1 A schematic diagram of the magnified system at point B.

[0017] The components include: 1. High-pressure main pipeline; 2. High-flow desuperheating and pressure reducing device; 3. High-pressure bypass branch pipe; 4. Low-flow bypass desuperheating and pressure reducing device; 5. Heating header; 6. Desuperheating water main pipe; 7. Desuperheating water branch pipe; 8. First low-pressure steam collection pipeline; 9. Isolation gate valve; 10. Water pump intermediate tap; 11. First electric gate valve; 12. Temperature regulating valve; 13. Second low-pressure steam collection pipeline; 14. Third low-pressure steam collection pipeline; 15. Flow meter; 16. Second electric gate valve. Detailed Implementation

[0018] To make the technical means, creative features, and achieved objectives and effects of this invention easier to understand, the invention is further described below with reference to specific embodiments. However, the following embodiments are merely preferred embodiments of this invention and not all of them. Other embodiments obtained by those skilled in the art based on the embodiments described herein without creative effort are all within the protection scope of this invention. Unless otherwise specified, the experimental methods in the following embodiments are conventional methods, and the materials and reagents used in the following embodiments are commercially available unless otherwise specified.

[0019] Example: like Figure 1 - Figure 3As shown, this embodiment proposes a dual-reduction layout system for wide-area load adjustment of the heating network, including: a high-pressure steam extraction module, used to extract high-pressure steam from the reheat hot section outlets of the two units respectively; a large-flow desuperheating and pressure reducing module, connected downstream of the high-pressure steam extraction module, used to reduce the high-pressure steam to low-pressure heating parameters; a bypass desuperheating and pressure reducing module, connected in parallel with the large-flow desuperheating and pressure reducing module downstream of the high-pressure steam extraction module, used to provide stable heating at a small flow rate under low load conditions; a high-pressure desuperheating water module, providing desuperheating water to the large-flow desuperheating and pressure reducing module and the bypass desuperheating and pressure reducing module respectively; a low-pressure steam collection and distribution module, collecting the low-pressure steam from the outlets of the large-flow desuperheating and pressure reducing module and the bypass desuperheating and pressure reducing module, and distributing it to different users; wherein, the outlets of the large-flow desuperheating and pressure reducing module and the bypass desuperheating and pressure reducing module are connected to the heating header 5 of the low-pressure steam collection and distribution module; the high-pressure desuperheating water module is connected to the desuperheating water inlet of the large-flow desuperheating and pressure reducing module and the bypass desuperheating and pressure reducing module respectively through a desuperheating water header 6 and branch pipes. The high-flow channel and the bypass low-flow channel are connected in parallel downstream of the same high-pressure extraction module to achieve continuous load regulation. This eliminates the problems of oscillation, scouring, and overheating caused by the opening of traditional single valves in the low-load area. The high-flow channel covers 50-300 t / h, and the bypass low-flow channel covers 5-50 t / h. The two are connected in parallel and merged into the same heating header 5, forming a continuously adjustable range of rated load. This solves the problems of single valve oscillation, overheating, and forced shutdown during the nighttime period of <10 t / h, achieving uninterrupted operation between day and night peak and valley. The first unit and the second unit form a dual-unit parallel structure, with the outlets of the two units merging into the same heating header 5. When one unit is under maintenance, the other unit can cover the entire heat load, improving system availability.

[0020] The high-pressure steam extraction module includes: a high-pressure main pipeline 1, one end of which is connected to the boiler reheat hot section outlet header, and the other end of which is connected to the inlet of the high-flow desuperheating and pressure reducing device 2; a high-pressure bypass branch pipe 3, one end of which is led out from the high-pressure main pipeline 1 through a tee, and the other end of which is connected to the inlet of the low-flow bypass desuperheating and pressure reducing device 4; the high-pressure main pipeline 1 is equipped with a pneumatic quick-closing valve, which is interlocked with the turbine trip signal and hard-interlocked with the turbine trip signal and the reheater wall temperature over-temperature signal; the high-pressure bypass branch pipe 3 is equipped with an electric gate valve to provide dual independent steam extraction capabilities, ensuring that the steam source is cut off when the boiler over-temperatures or the unit trips, avoiding the reheater wall temperature from exceeding the limit, while retaining the bypass channel to continue supplying heat, achieving uninterrupted power supply during faults.

[0021] The high-flow-rate desuperheating and pressure-reducing module includes: a high-flow-rate desuperheating and pressure-reducing device 2, with its inlet connected to the high-pressure main pipeline 1 and its outlet connected to the first low-pressure steam collection pipeline 8; the desuperheating water inlet of the high-flow-rate desuperheating and pressure-reducing device 2 is connected to the desuperheating water main pipe; the outlet pipe of the high-flow-rate desuperheating and pressure-reducing device 2 is equipped with a spring-loaded safety valve and a high-temperature switch, covering the high-load section, with double protection of the safety valve and temperature interlock to prevent overpressure of the low-pressure main pipe and overheating at the user end; the low-flow-rate bypass desuperheating and pressure-reducing device 4 is equipped with isolation gate valves 9 before and after it. Independent branch pipes for the desuperheating water ensure a rapid drop in water temperature at high flow rates, avoiding thermal shock. The low-flow bypass desuperheating and pressure reducing module includes: a low-flow bypass desuperheating and pressure reducing device 4, with its inlet connected to a high-pressure bypass branch pipe 3 and its outlet connected to a first low-pressure steam collection pipe 8; the desuperheating water inlet of the low-flow bypass desuperheating and pressure reducing device 4 is connected to a desuperheating water branch pipe 7, one end of which is connected to a desuperheating water main pipe 6; an electric gate valve is installed on the inlet pipe of the low-flow bypass desuperheating and pressure reducing device 4, and the electric gate valve is interlocked with the outlet pressure; a check valve to prevent steam backflow is installed on the outlet pipe of the low-flow bypass desuperheating and pressure reducing device 4 for use in low-load sections. The high-pressure desuperheating water module includes: a desuperheating water main pipe 6, one end of which is connected to the intermediate tap 10 of the water supply pump, and the other end of which is connected to the desuperheating water branch pipe 7; both the desuperheating water main pipe 6 and the desuperheating water branch pipe 7 are equipped with a first electric gate valve 11 and a temperature regulating valve 12, and the two desuperheating water lines are completely independent, with the large and small channels being activated simultaneously or separately; the check valve is interlocked with low water pressure to ensure zero backflow in the water supply system and to prevent water hammer and water pump cavitation. The low-pressure steam collection and distribution module includes: a heating manifold 5, with its inlet connected to a first low-pressure steam collection pipeline 8, and its outlets connected to a second low-pressure steam collection pipeline 13 and a third low-pressure steam collection pipeline 14, respectively; the outlets of the second low-pressure steam collection pipeline 13 and the third low-pressure steam collection pipeline 14 are respectively connected to different user areas, and both the second low-pressure steam collection pipeline 13 and the third low-pressure steam collection pipeline 14 are equipped with a second electric gate valve 16 and a flow meter 15. The bottom of the heating manifold 5 is equipped with a drain valve and a liquid level indicator to promptly remove condensate during startup and low load, preventing water hammer and steam blockage; the local liquid level and remote signal dual indication ensure zero water accumulation in the heating manifold 5 and extend its service life. The high-pressure extraction module, along with the high-flow desuperheating and pressure-reducing module and the bypass desuperheating and pressure-reducing module, are also fully installed on the second unit side, forming a dual-unit complementary structure parallel to the first unit. One end of the high-pressure main pipeline 1 on the unit side is connected to the reheat hot section outlet of the second boiler, and the other end is connected to the high-flow desuperheating and pressure-reducing device 2 and the low-flow bypass desuperheating and pressure-reducing device 4, respectively. When a single unit is under maintenance or fails, the other unit can independently cover the heat load, improving the system availability and solving the risk of a plant-wide shutdown due to a single unit failure.

[0022] How to use the dual-reduction layout system for wide-area load adjustment in heating pipe networks: S1. Check the valve status, confirm that the gate valves before and after the large flow desuperheating and pressure reducing device 2 are open, confirm that the gate valves 9 before and after the small flow bypass desuperheating and pressure reducing device 4 are closed, confirm that the first electric gate valve 11 and temperature regulating valve 12 on the desuperheating water main pipe 6 and branch pipe 7 are closed, open the drain valve at the bottom of the heating manifold 5, drain the condensate, and close it after the liquid level indicator is normal. S2. Slowly open the main gate valve on the high-pressure main pipeline 1 to supply steam to the high-flow desuperheating and pressure reducing device 2, open the first electric gate valve 11 on the desuperheating water header 6, start the temperature regulating valve 12, control the desuperheating water flow rate, and make the outlet steam temperature reach the low-pressure heating parameters. S3. The low-pressure steam after de-temperature and pressure reduction enters the heating header 5 through the first low-pressure steam collection pipeline 8. According to user needs, the second electric gate valve 16 on the second low-pressure steam collection pipeline 13 or the third low-pressure steam collection pipeline 14 is opened, the flow meter 15 is adjusted to the target flow, and the pressure, temperature and liquid level of the heating header 5 are monitored in real time to ensure stable operation. S4. Slowly close the gate valves before and after the high-flow desuperheating and pressure reducing device 2, stop the main module operation, open the gate valve on the high-pressure bypass branch pipe 3 and the isolation gate valves 9 before and after the low-flow bypass desuperheating and pressure reducing device 4, and adjust the desuperheating water flow through the first electric gate valve 11 and the temperature regulating valve 12 to ensure stable outlet steam parameters. S5. Small flow of steam enters the heating header 5 through the first low-pressure steam collection pipeline 8 and continues to supply heat to users; S6. Repeat steps S1 and S2 to start the high-pressure extraction module and high-flow desuperheating and pressure reducing module on the second unit side, and also merge its outlet steam into the same heating header 5 to achieve steam complementarity between the two units.

[0023] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0024] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the foregoing embodiments. The embodiments and descriptions in the specification are merely preferred examples and are not intended to limit the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of the present invention is defined by the appended claims and their equivalents.

Claims

1. A dual-reduction layout system for wide-area load adjustment of heating pipe networks, characterized in that, include: The high-pressure steam extraction module is used to extract high-pressure steam from the reheat hot section outlets of the two units respectively; The high-flow-rate desuperheating and pressure-reducing module is connected downstream of the high-pressure steam extraction module and is used to reduce the high-pressure steam to low-pressure heating parameters. The bypass desuperheating and pressure reducing module is connected in parallel with the high-flow desuperheating and pressure reducing module downstream of the high-pressure extraction module, and is used to provide stable heating with a small flow rate under low load conditions. The high-pressure desuperheating water module supplies desuperheating water to both the high-flow desuperheating and pressure-reducing module and the bypass desuperheating and pressure-reducing module. The low-pressure steam collection and distribution module collects the low-pressure steam from the outlets of the high-flow desuperheating and pressure-reducing module and the bypass desuperheating and pressure-reducing module, and distributes it to different users. Among them, the outlets of the high-flow-rate de-heating and pressure-reducing module and the bypass de-heating and pressure-reducing module are connected to the heating manifold (5) of the low-pressure steam distribution module; the high-pressure de-heating water module is connected to the de-heating water inlet of the high-flow-rate de-heating and pressure-reducing module and the bypass de-heating and pressure-reducing module through the de-heating water header (6) and branch pipes respectively.

2. The dual-reduction arrangement system for wide-area load adjustment of heating pipe networks according to claim 1, characterized in that: The high-pressure steam extraction module includes: The high-pressure main pipeline (1) is connected at one end to the outlet header of the boiler reheat section and at the other end to the inlet of the high-flow desuperheating and pressure reducing device (2). The high-pressure bypass branch pipe (3) is led out from the high-pressure main pipe (1) through a tee at one end, and connected to the inlet of the low-flow bypass de-cooling and pressure reducing device (4) at the other end.

3. The dual-reduction arrangement system for wide-area load adjustment of heating pipe networks according to claim 2, characterized in that: The high-flow-rate cooling and pressure-reducing module includes: High flow rate desuperheating and pressure reducing device (2), the inlet is connected to the high pressure main pipeline (1), and the outlet is connected to the first low pressure steam collection pipeline (8); The desuperheating water inlet of the high-flow desuperheating and pressure reducing device (2) is connected to the desuperheating water main pipe.

4. The dual-reduction arrangement system for wide-area load adjustment of heating pipe networks according to claim 3, characterized in that: The low-flow bypass cooling and pressure reduction module includes: The inlet of the small flow bypass desuperheating and pressure reducing device (4) is connected to the high pressure bypass branch pipe (3), and the outlet is connected to the first low pressure steam collection pipe (8). The desuperheating water inlet of the small flow bypass desuperheating and pressure reducing device (4) is connected to the desuperheating water branch pipe (7), and one end of the desuperheating water branch pipe (7) is connected to the desuperheating water main pipe (6). The small flow bypass de-cooling and pressure reducing device (4) is equipped with isolation gate valves (9) before and after it.

5. The dual-reduction arrangement system for wide-area load adjustment of heating pipe networks according to claim 4, characterized in that: The high-pressure desuperheating water module includes: The cooling water main pipe (6) is connected at one end to the middle tap of the water pump (10) and at the other end to the cooling water branch pipe (7). Both the cooling water main pipe (6) and the cooling water branch pipe (7) are equipped with a first electric gate valve (11) and a temperature regulating valve (12).

6. The dual-reduction arrangement system for wide-area load adjustment of heating pipe networks according to claim 5, characterized in that: The low-pressure steam collection and distribution module includes: The heating manifold (5) is connected to the first low-pressure steam pipe (8) at its inlet and to the second low-pressure steam pipe (13) and the third low-pressure steam pipe (14) at its outlet. The outlets of the second low-pressure steam collection pipeline (13) and the third low-pressure steam collection pipeline (14) are respectively connected to different user areas, and the second low-pressure steam collection pipeline (13) and the third low-pressure steam collection pipeline (14) are each equipped with a second electric gate valve (16) and a flow meter (15).

7. The dual-reduction arrangement system for wide-area load adjustment of heating pipe networks according to claim 6, characterized in that: The bottom of the heating manifold (5) is equipped with a drain valve and a liquid level indicator.

8. The dual-reduction arrangement system for wide-area load adjustment of heating pipe networks according to claim 1, characterized in that: The high-pressure extraction module, along with the high-flow desuperheating and pressure-reducing module and the bypass desuperheating and pressure-reducing module, are also fully installed on the second unit side, forming a dual-unit complementary structure parallel to the first unit.

9. The dual-reduction arrangement system for wide-area load adjustment of heating pipe networks according to claim 8, characterized in that: One end of the high-pressure main pipeline on the machine side is connected to the reheat hot section outlet of the second boiler, and the other end is connected to the large flow desuperheating and pressure reducing device (2) and the small flow bypass desuperheating and pressure reducing device (4).

10. The method of using the dual-reduction arrangement system for wide-area load adjustment of heating pipe networks according to any one of claims 1-9, characterized in that: S1. Check the valve status, confirm that the gate valves before and after the large flow desuperheating and pressure reducing device (2) are open, confirm that the gate valves before and after the small flow bypass desuperheating and pressure reducing device (4) are closed, confirm that the first electric gate valve (11) and temperature regulating valve (12) on the desuperheating water main pipe (6) and branch pipe (7) are closed, open the drain valve at the bottom of the heating manifold (5), drain the condensate, and close it after the liquid level indicator is normal. S2. Slowly open the main gate valve on the high-pressure main pipeline (1) to supply steam to the high-flow desuperheating pressure reducer (2), open the first electric gate valve (11) on the desuperheating water header (6), start the temperature regulating valve (12), control the desuperheating water flow rate, and make the outlet steam temperature reach the low-pressure heating parameters. S3. The low-pressure steam after de-temperature and de-pressure reduction enters the heating header (5) through the first low-pressure steam collection pipeline (8). According to user needs, the second electric gate valve (16) on the second low-pressure steam collection pipeline (13) or the third low-pressure steam collection pipeline (14) is opened, the flow meter (15) is adjusted to the target flow, and the pressure, temperature and liquid level of the heating header (5) are monitored in real time to ensure stable operation. S4. Slowly close the gate valves before and after the high flow desuperheating and pressure reducing device (2), stop the main module operation, open the gate valve on the high pressure bypass branch pipe (3) and the isolation gate valves (9) before and after the low flow bypass desuperheating and pressure reducing device (4), and adjust the desuperheating water volume through the first electric gate valve (11) and the temperature regulating valve (12) to ensure stable outlet steam parameters. S5. Small flow steam enters the heating header (5) through the first low-pressure steam collection pipeline (8) and continues to supply heat to users; S6. Repeat steps S1 and S2 to start the high-pressure extraction module and high-flow desuperheating and pressure reducing module on the side of the second unit, and also merge its outlet steam into the same heating header (5) to achieve steam complementarity between the two units.

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