Multi-machine-furnace header system combined transportation system

Abstract

The invention discloses a multi-machine-boiler header system combined transportation system, and relates to the technical field of generator sets, the multi-machine-boiler header system combined transportation system comprises a plurality of boilers and a plurality of steam turbines, the boilers converge main steam pipes to the same main steam header pipe, and the steam turbines correspond to the boilers one to one; the main steam mother pipe distributes main steam to high-pressure cylinders of all the steam turbines according to needs, the high-pressure cylinders of all the steam turbines converge steam exhaust pipes to the same reheating cold section mother pipe, and the reheating cold section mother pipe distributes the amount of steam entering all the boiler reheaters through the reheating cold section pipe according to needs. The boiler reheaters converge the reheating heat section pipes to the same reheating heat section mother pipe, and the reheating heat section mother pipe distributes steam into an intermediate-pressure cylinder of the steam turbine according to needs. According to the system, main steam, cold reheat and hot reheat parameters can be consistent with operation requirements of all equipment of the system, machine-boiler decoupling and decoupling between units can be achieved, and conditions for flexible operation of the units are promoted.

Description

Technical Field

[0001] The present application relates to the technical field of generator sets, and in particular to a multi-machine boiler master control intermodal system. Background Art

[0002] Multi-unit, multi-boiler interoperation busbar control units connect multiple units to boiler and turbine systems through a busbar control. Instead of the conventional one-to-one correspondence between a single boiler and a single turbine, the boilers and turbines can each operate across a wide range of loads, even in a split configuration. This improves operational flexibility when the boilers and turbines are mismatched. With increasing demands for low-carbon, high-efficiency, and flexible units, and with the advancement of rapid load-variation and deep peak-shaving technologies, busbar control has become increasingly valuable for large units due to its ability to reduce operational dependencies between units and boilers and improve operational flexibility.

[0003] Large units typically have reheat systems, with the main steam and reheater interconnected with the turbine and boiler. This results in complex control systems for these units. Key issues include overheating or underheating of the boiler reheater, imbalanced steam flow between the high-pressure and intermediate-pressure cylinders of the turbine, and imbalanced feedwater systems. Improper system configuration can significantly restrict turbine and boiler operation, failing to meet the required flexibility of the control system. Summary of the Invention

[0004] The main purpose of this application is to provide a multi-machine boiler motherboard control intermodal system, which aims to solve the technical problem of insufficient operating flexibility of existing multi-machine boiler motherboard control units.

[0005] The technical solutions adopted in this application are as follows: A multi-machine boiler main pipe interoperation system includes multiple boilers and multiple steam turbines. The multiple boilers respectively gather their main steam pipes into the same main steam main pipe. The multiple steam turbines correspond to the multiple boilers one-to-one, and the main steam main pipe distributes the main steam to the high-pressure cylinder of each steam turbine as needed. The high-pressure cylinder of each steam turbine gathers the exhaust pipes into the same reheating cold section main pipe. The reheating cold section main pipe distributes the steam amount entering each boiler reheater as needed through the reheating cold section pipe. The boiler reheaters respectively gather their reheating hot section pipes into the same reheating hot section main pipe. The reheating hot section main pipe distributes steam to the intermediate pressure cylinders of the steam turbines as needed.

[0006] Optionally, a main steam inlet pipe is provided between the main steam main pipe and the high-pressure cylinder of the steam turbine, and a high-pressure regulating valve is provided on the main steam inlet pipe.

[0007] Optionally, the exhaust pipe is provided with a high-exhaust regulating valve, a high-exhaust check valve and a high-exhaust desuperheater.

[0008] Optionally, a reheater inlet regulating valve and a reheater inlet flow meter are provided on the reheater cold section pipe.

[0009] Optionally, an auxiliary reheater is provided between the reheat cold section tube and the reheat hot section tube, the steam inlet pipe of the auxiliary reheater is located before the reheater inlet regulating valve, and the steam outlet pipe of the auxiliary reheater is located after the outlet of the boiler reheater.

[0010] Optionally, an auxiliary reheater steam inlet regulating valve is provided on the steam inlet pipe of the auxiliary reheater.

[0011] Optionally, an intermediate pressure cylinder steam inlet pipe is provided between the reheating hot section main pipe and the intermediate pressure cylinder of the steam turbine, and an intermediate pressure cylinder steam inlet regulating valve and an intermediate pressure cylinder steam inlet flow meter are provided on the intermediate pressure cylinder steam inlet pipe.

[0012] Optionally, the intermediate pressure cylinder steam inlet pipe is externally connected to a bypass branch pipe, and the bypass branch pipe is used to discharge excess steam entering the intermediate pressure cylinder.

[0013] Optionally, the heat recovery water supply pipes of the plurality of boilers are combined into the same water supply main pipe, and the water supply main pipe supplies water to each boiler as needed through the heat supply water inlet pipe.

[0014] Optionally, a booster pump is provided on the heat recovery water supply pipe, and a water supply regulating valve and a water supply flow meter are provided on the heat supply water inlet pipe.

[0015] Compared with the prior art, the present invention has the following advantages: The present application proposes a multi-machine boiler mother pipe intermodal system, including multiple boilers and multiple steam turbines, each of the multiple boilers collects the main steam pipe into the same main steam mother pipe, the multiple steam turbines correspond to the multiple boilers one-to-one, and the main steam mother pipe distributes the main steam to the high-pressure cylinder of each steam turbine as needed, the high-pressure cylinder of each steam turbine collects the exhaust pipe into the same reheating cold section mother pipe, the reheating cold section mother pipe distributes the steam amount entering each boiler reheater as needed through the reheating cold section pipe, the boiler reheaters each collect the reheating hot section pipes into the same reheating hot section mother pipe, and the reheating hot section mother pipe distributes the steam to the steam turbines as needed. Inside the intermediate pressure cylinder of the turbine, unlike the traditional multi-machine boiler interoperable main pipe control unit that only interconnects multiple boilers and multiple turbines through a steam main pipe (common pipeline), this application connects all the main pipes of the boiler main steam and reheat related systems. The differences between the local boiler and the steam turbine, and between the boilers and steam turbines of different units are configured according to the main steam and reheat requirements of the boiler, and the requirements of the steam turbine are also adapted. Through various adjustment means set up in this system, the main steam, cold reheat and hot reheat parameters can be made consistent with the operating requirements of various equipment in the system, and the decoupling of the machine and boiler and the decoupling between units can be achieved, thus promoting the conditions for flexible operation of the unit. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a system structure diagram of the multi-machine boiler mother control intermodal system provided in an embodiment of the present application.

[0017] Description of the reference numerals in the accompanying drawings: 1- Main steam header; 2- Reheat cold section header; 3- Reheat hot section header; 4- Feedwater header; 5- #1 steam turbine high pressure cylinder; 6- #1 steam turbine intermediate pressure cylinder; 7- #2 steam turbine high pressure cylinder; 8- #2 steam turbine intermediate pressure cylinder; 9- #1 boiler; 10- #1 high pressure exhaust regulating valve; 11- #2 boiler; 12- #2 high pressure exhaust regulating valve; 13- #1 main steam pipe; 14- #1 main steam inlet pipe; 15- #1 exhaust pipe; 16- #1 reheat cold section pipe; 17- #1 Heat recovery feed water pipe; 18-#1 heat recovery water inlet pipe; 19-#1 boiler reheater steam inlet pipe; 21-#1 intermediate pressure cylinder steam inlet pipe; 22-#1 high pressure exhaust check valve; 23-#1 feed water regulating valve; 24-#1 feed water flow meter; 25-#1 reheater inlet regulating valve; 26-#1 reheater inlet flow meter; 27-#1 high pressure exhaust desuperheater; 28-#1 intermediate pressure cylinder steam inlet regulating valve; 29-#1 intermediate pressure cylinder steam inlet flow meter; 30-#2 main steam pipe; 31-#2 Main steam inlet pipe; 32-#2 exhaust pipe; 33-#2 reheat cold section pipe; 34-#2 heat recovery feed water pipe; 35-#2 heat recovery inlet pipe; 36-#2 boiler reheater steam inlet pipe; 38-#2 intermediate pressure cylinder steam inlet pipe; 39-#2 high pressure exhaust check valve; 40-#2 feed water regulating valve; 41-#2 feed water flow meter; 42-#2 reheater inlet regulating valve; 43-#2 reheater inlet flow meter; 44-#2 high pressure exhaust desuperheater; 45-#2 intermediate pressure cylinder steam inlet regulating valve Valve; 46-#2 medium pressure cylinder steam inlet flowmeter; 49-#1 high pressure regulating valve; 50-#2 high pressure regulating valve; 51-#1 booster pump; 52-#2 booster pump; 53-#1 reheat hot section pipe; 54-#2 reheat hot section pipe; 55-#1 auxiliary reheater; 56-#1 auxiliary reheater inlet regulating valve; 57-#1 auxiliary reheater steam inlet pipe; 58-#2 auxiliary reheater; 59-#2 auxiliary reheater inlet regulating valve; 60-#2 auxiliary reheater steam inlet pipe. DETAILED DESCRIPTION

[0018] The following will be combined with the drawings in the embodiments of this application to clearly and completely describe the technical solutions in the embodiments of this application. Obviously, the embodiments described are only part of the embodiments of this application, not all of the embodiments. Based on the embodiments of this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0019] It should be noted that all directional indications in the embodiments of the present application (such as up, down, left, right, front, back, etc.) are only used to explain the relative position relationship, movement status, etc. between the various components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0020] In this application, unless otherwise specified or limited, the terms "connection" and "fixation" should be understood in a broad sense. For example, "fixation" can mean fixed connection, detachable connection, or integration; mechanical connection or electrical connection; direct connection or indirect connection through an intermediate medium; internal communication between two elements or interaction between two elements, unless otherwise specified. For those skilled in the art, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0021] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present application, the descriptions of "first", "second", etc. are only for descriptive purposes and cannot be understood as indicating or suggesting their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of such features. In addition, the meaning of "and / or" appearing throughout the text includes three parallel schemes. Taking "A and / or B" as an example, it includes scheme A, or scheme B, or a scheme in which A and B are satisfied at the same time. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of ordinary technicians in this field to implement it. When the combination of technical solutions is mutually contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by this application.

[0022] Refer to the attached Figure 1 , an embodiment of the present application provides a multi-machine boiler mother pipe interoperation system, including multiple boilers and multiple steam turbines, the multiple boilers each collect the main steam pipe into the same main steam mother pipe, the multiple steam turbines correspond to the multiple boilers one-to-one, and the main steam mother pipe distributes the main steam to the high-pressure cylinder of each steam turbine as needed, the high-pressure cylinder of each steam turbine collects the exhaust pipe into the same reheat cold section mother pipe, the reheat cold section mother pipe distributes the steam amount entering each boiler reheater as needed through the reheat cold section pipe, the boiler reheaters each collect the reheat hot section pipes into the same reheat hot section mother pipe, and the reheat hot section mother pipe distributes steam to the intermediate pressure cylinder of the steam turbine as needed.

[0023] Traditional steam-powered multi-unit boiler interoperation is a classic steam power system operating method in thermal power plants. Its core is to interconnect multiple boilers and multiple steam turbines through a steam main (common pipeline). However, in actual application, it faces the following problems: First, due to the differences in the reheat steam parameters (temperature / pressure) output by multiple boilers, the steam from different boilers may form local high-temperature or low-temperature areas after entering the main pipe and mixing. This may easily cause the boiler reheater to overheat or underheat after the main pipe supplies hot steam.

[0024] Second, when multiple turbines adjust their inlet valves simultaneously, the main pipe pressure fluctuates, leading to a mismatch between the HP cylinder exhaust flow and the demand from the IP cylinder. For example, if a turbine is rapidly deloaded, its HP cylinder exhaust steam decreases, but the IP cylinder still relies on the existing reheat steam flow, causing a transient shortfall.

[0025] In response to the above-mentioned technical problems that need to be solved urgently, the present application provides a multi-machine boiler mother pipe interoperation system in an embodiment of the present application, including multiple boilers and multiple steam turbines, each of the multiple boilers collects the main steam pipe into the same main steam mother pipe, the multiple steam turbines correspond one-to-one to the multiple boilers, and the main steam mother pipe distributes the main steam to the high-pressure cylinder of each steam turbine as needed, the high-pressure cylinder of each steam turbine collects the exhaust pipe into the same reheat cold section mother pipe, the reheat cold section mother pipe distributes the steam amount entering each boiler reheater as needed through the reheat cold section pipe, the boiler reheaters each collect the reheat hot section pipes into the same reheat hot section mother pipe, and the reheat hot section mother pipe distributes steam to the intermediate pressure cylinder of the steam turbine as needed.

[0026] It is not difficult to find that under this implementation mode, by connecting all the main pipes of the system related to the boiler main steam and reheat, the differences between the local boiler and the steam turbine, and between the boilers and steam turbines of different units are configured according to the main steam and reheat requirements of the boiler, and the requirements of the steam turbine are also adapted. Through the various adjustment means set up in this system, the main steam, cold reheat and hot reheat parameters can be made consistent with the operating requirements of various equipment in the system, and the decoupling of the boiler and the machine can be achieved, as well as the decoupling between the units, thereby promoting the conditions for flexible operation of the units.

[0027] In one embodiment, main steam for the steam turbine to perform work is generated during the combustion process of the boiler. The main steam flows into the main steam header through the main steam pipe. The steam from all boilers converges in the main steam header for mixing. Of course, a main steam inlet pipe is provided between the main steam header and the high-pressure cylinder of the steam turbine. The main steam inlet pipe is used to send the steam in the main steam header into the high-pressure cylinder of the steam turbine. A high-pressure regulating valve is provided on the main steam inlet pipe connecting the main steam header and the high-pressure cylinder of the steam turbine.

[0028] It is not difficult to imagine that under this embodiment, a high-pressure regulating valve is provided on the main steam inlet pipe connecting the main steam main pipe and the high-pressure cylinder of the steam turbine, and the high-pressure regulating valve is used to realize on-demand adjustment of the steam intake amount of the high-pressure cylinder of the steam turbine. When the high-pressure cylinder of the steam turbine requires a larger amount of steam, the opening of the high-pressure regulating valve is increased to increase the steam intake amount of the high-pressure cylinder of the steam turbine. On the contrary, when the high-pressure cylinder of the steam turbine requires a smaller amount of steam, the opening of the high-pressure regulating valve is reduced to reduce the steam intake amount of the high-pressure cylinder of the steam turbine, thereby realizing on-demand adjustment of the steam intake amount of the high-pressure cylinder of the steam turbine.

[0029] In one embodiment, the high-pressure cylinder of the steam turbine is connected to the reheat cold section main pipe at the exhaust port through an exhaust pipe, and the exhaust pipe is provided with a high-pressure exhaust regulating valve, a high-pressure exhaust check valve and a high-pressure exhaust desuperheater.

[0030] As will be appreciated, in this embodiment, the high-pressure exhaust (HP) regulating valve controls steam flow or pressure to adjust steam parameters during HP exhaust, ensuring that downstream equipment such as reheaters and other components operate in optimal conditions. In multi-unit systems, coordination between different units requires precise steam flow control, and the HP exhaust regulating valve is used to balance the load or pressure of different units. The HP exhaust check valve prevents backflow of the medium. In a steam turbine system, when the HP exhaust flows to the reheater or other components, the check valve prevents reverse flow of steam. For example, in the event of a unit shutdown or failure, steam can flow back into the HP exhaust, potentially causing equipment damage or safety hazards. The presence of a check valve is particularly important in multi-unit systems. Since multiple units are interconnected, the check valve can isolate the faulty unit and ensure normal operation of the rest of the system. Furthermore, the HP exhaust desuperheater (DESU) is used to reduce steam temperature. Because HP exhaust temperature can be too high, directly entering the reheater or other equipment could exceed the material tolerance. The desuperheater reduces the temperature by spraying water or other means to protect downstream equipment. Furthermore, temperature control helps improve thermal efficiency and prevents thermal stress from damaging piping and equipment.

[0031] In one embodiment, the reheat cold section main pipe is connected to the boiler reheater through a reheat cold section pipe, and a reheater inlet regulating valve and a reheater inlet flow meter are provided on the reheat cold section pipe.

[0032] In the above-described embodiment, the reheater inlet regulating valve is typically used to control the flow and pressure entering the boiler reheater, ensuring that steam parameters meet design requirements. Furthermore, the regulating valve adjusts flow during variable load conditions to maintain system stability, prevent excessive temperature fluctuations, and protect the reheater piping. A reheater inlet flowmeter monitors steam flow in real time and provides feedback to the control system, enabling the reheater inlet regulating valve to make appropriate adjustments. Furthermore, flow data may be used to calculate efficiency, optimize combustion and steam parameters, and monitor for anomalies, such as sudden changes in flow rate that may indicate leaks or blockages.

[0033] In one embodiment, an auxiliary reheater is provided between the cold reheating section pipe and the hot reheating section pipe, the steam inlet pipe of the auxiliary reheater is located before the reheater inlet regulating valve, and the steam outlet pipe of the auxiliary reheater is located after the outlet of the boiler reheater (i.e., before the intermediate pressure cylinder of the steam turbine).

[0034] In the above embodiment, it is conceivable that the boiler reheater outlet steam temperature may be insufficient (e.g., below the design value of 540°C) due to load fluctuations, fuel changes, or equipment aging. The auxiliary reheater can then reheat the steam to ensure that the steam temperature entering the intermediate pressure cylinder remains stable within the range of 540–570°C, thus preventing the reduction of turbine efficiency due to excessively low temperatures. Furthermore, under low load or high backpressure conditions, the boiler reheater outlet steam may carry moisture (wet steam) due to insufficient temperature. Further heating by the auxiliary reheater can increase the steam dryness (approaching dry saturation or superheated state), preventing wet steam from entering the intermediate pressure cylinder and corroding the blades. Therefore, by providing an auxiliary reheater, precise adjustment of the intermediate pressure cylinder inlet steam parameters can be achieved, thereby improving unit thermal efficiency, enhancing operational flexibility, and protecting the turbine.

[0035] In one embodiment, an auxiliary reheater steam inlet regulating valve is provided on the steam inlet pipe of the auxiliary reheater.

[0036] In the above embodiment, by setting up the auxiliary reheater steam inlet regulation valve, the steam flow rate can be precisely controlled, which can optimize the heating efficiency of the auxiliary reheater, thereby improving the overall thermal cycle efficiency. At the same time, it prevents excessive fluctuations in steam parameters, reduces thermal stress on the equipment, and extends its service life.

[0037] In one embodiment, the boiler reheater is connected to the reheat hot section main pipe through the reheat hot section pipe, and an intermediate pressure cylinder steam inlet pipe is arranged between the reheat hot section main pipe and the intermediate pressure cylinder of the steam turbine, and an intermediate pressure cylinder steam inlet regulating valve and an intermediate pressure cylinder steam inlet flow meter are arranged on the intermediate pressure cylinder steam inlet pipe.

[0038] In the above embodiment, the steam discharged from the high-pressure cylinder enters the intermediate-pressure cylinder after reheating. The steam inlet parameters of the intermediate-pressure cylinder will be affected by the reheater. The intermediate-pressure cylinder steam inlet regulating valve needs to control the amount of steam entering the intermediate-pressure cylinder to adapt to different load requirements while maintaining pressure stability. The flow meter monitors the flow in real time, helps the regulating valve to adjust, and ensures that the system operates within a safe range.

[0039] In one embodiment, a bypass branch pipe is externally connected to the steam inlet pipe of the intermediate pressure cylinder, and the bypass branch pipe is used to discharge excess steam entering the intermediate pressure cylinder.

[0040] In the above embodiment, a bypass branch pipe is provided, and when the steam intake of the intermediate pressure cylinder exceeds the amount, part of the steam is bypassed by the branch pipe, thereby controlling the steam intake parameters of the intermediate pressure cylinder and keeping the pressure of the intermediate pressure cylinder stable.

[0041] In one embodiment, the heat recovery water pipes of multiple boilers are combined into the same water supply main pipe, and the water supply main pipe supplies water to each boiler as needed through the heat supply water inlet pipe.

[0042] In the above embodiment, by connecting all the main pipes of the system related to water supply, the differences between the local boiler and the steam turbine, and between the boilers and steam turbines of different units are configured according to the boiler water supply requirements, and the requirements of the steam turbine are also adapted. Through the water supply regulation means set in this system, the water supply parameters can be made consistent with the operating requirements of various equipment in the system, and the decoupling of the boiler and the machine can be achieved, as well as the decoupling between the units, thereby promoting the conditions for flexible operation of the units.

[0043] In one embodiment, a booster pump is provided on the heat recovery water supply pipe, and a water supply regulating valve and a water supply flow meter are provided on the heat supply water inlet pipe.

[0044] In the above implementation, the return water pressure drops after passing through the condenser, deaerator, heater, and other equipment. The booster pump then raises the return water pressure to the boiler feedwater requirement (e.g., 1.5–3 MPa), ensuring that the water can overcome pipe friction and height differences. Furthermore, when the boiler is operating at high load, the booster pump ensures that the return water flow matches the evaporation rate, preventing boiler water shortages (which could lead to pipe bursts) or overfilling (which could affect steam quality). The feedwater regulating valve dynamically adjusts its opening based on the boiler evaporation rate (e.g., opening the valve wider as load increases) to maintain a stable drum water level (water level fluctuations must be controlled within ±10 mm). Throttling also balances the booster pump outlet pressure with the boiler inlet pressure, preventing overpressure (which could damage pipes) or underpressure (which could lead to insufficient water supply). A feedwater flowmeter provides flow data feedback to the DCS system, interacting with the regulating valve to form a "monitoring-regulation-stabilization" closed loop, ensuring that the flow rate precisely matches the setpoint.

[0045] To further illustrate a multi-machine boiler mother control intermodal system provided in the embodiment of the present application, a two-furnace two-machine mother control system is combined with the attached Figure 1 For explanation, #1 represents the equipment of Unit 1, and #2 represents the equipment of Unit 2. Specifically: like Figure 1 As shown, the #1 main steam pipe 13 and the #2 main steam pipe 30 of the #1 boiler 9 and the #2 boiler 11 are connected to the main steam header 1. The main steam header 1 is connected to the #1 steam turbine high-pressure cylinder 5 and the #2 steam turbine high-pressure cylinder 7 through the #1 main steam inlet pipe 14 and the #2 main steam inlet pipe 31, respectively. The main steam inlet amount entering the #1 steam turbine high-pressure cylinder 5 and the #2 steam turbine high-pressure cylinder 7 is redistributed through the #1 high-pressure regulating valve 49 and the #2 high-pressure valve 50 of the #1 steam turbine and the #2 steam turbine; The #1 exhaust pipe 15 and #2 exhaust pipe 32 of the #1 steam turbine high-pressure cylinder 5 and #2 steam turbine high-pressure cylinder 7 are equipped with a #1 high-pressure exhaust regulating valve 10, a #2 high-pressure exhaust regulating valve 12, a #1 high-pressure exhaust desuperheater 27, a #2 high-pressure exhaust desuperheater 44, a #1 high-pressure exhaust flowmeter 22, and a #2 high-pressure exhaust flowmeter 39. The high-pressure exhaust pressure and temperature are adjusted before entering the reheat cold section main pipe 2. The adjustment target is the low value of the high-pressure exhaust of the two steam turbines. The reheat cold section main pipe 2 is connected to the #1 boiler reheater and the #2 boiler reheater through the #1 reheat cold section pipe 16 and the #2 reheat cold section pipe 33, respectively, through the #1 boiler reheater steam inlet pipe 19 and the #2 boiler reheater steam inlet pipe 36. The #1 boiler reheater steam inlet pipe 19 is provided with a #1 reheater inlet regulating valve 25 and a #1 reheater inlet flowmeter 26, and the #2 boiler reheater steam inlet pipe 36 is provided with a #2 reheater inlet regulating valve 42 and a #2 reheater inlet flowmeter 43, redistributing the steam in the reheat cold section main pipe 2 to the #1 boiler reheater and the #2 boiler reheater. A #1 auxiliary reheater 55 is provided between the #1 reheat cold section pipe 16 and the #1 reheat hot section pipe 53 of the #1 boiler 9. A #2 auxiliary reheater 58 is provided between the #2 reheat cold section pipe 33 and the #2 reheat hot section pipe 54 of the #2 boiler. The #1 auxiliary reheater 55 is located before the #1 reheater inlet regulating valve 25 of the #1 boiler and after the #1 boiler reheater outlet (before the steam inlet of the #1 intermediate pressure cylinder 6). The #2 auxiliary reheater 58 is located before the #2 reheater inlet regulating valve 42 of the #2 boiler 11 and after the #2 boiler reheater outlet (before the steam inlet of the #1 intermediate pressure cylinder 8). A #1 auxiliary reheater steam inlet regulating valve 56 is provided on the #1 auxiliary reheater steam inlet pipe 57, and a #2 auxiliary reheater steam inlet regulating valve 59 is provided on the #2 auxiliary reheater steam inlet pipe 60. The #1 auxiliary reheater 55 is put into use when the #1 high-pressure exhaust desuperheater 27 is put into use, and the #2 auxiliary reheater 28 is put into use when the #2 high-pressure exhaust desuperheater 44 is put into use to replenish the medium-pressure inlet steam temperature of the high-pressure exhaust unit being cooled; The steam heated by the #1 boiler reheater and the #2 boiler reheater enters the reheating hot section main pipe 3 through the #1 reheating hot section pipe 53 and the #2 reheating hot section pipe 54 respectively. The reheating hot section main pipe 3 is connected to the #1 intermediate pressure cylinder 6 through the #1 intermediate pressure cylinder steam inlet pipe 21, and the reheating hot section main pipe 3 is connected to the #2 intermediate pressure cylinder 8 through the #2 intermediate pressure cylinder steam inlet pipe 38. The steam flows through the #1 intermediate pressure cylinder steam inlet regulating valve 28 and the #1 intermediate pressure cylinder steam inlet flow meter 29 set on the #1 intermediate pressure cylinder steam inlet pipe 21 and the #2 intermediate pressure cylinder steam inlet flow meter. The #2 intermediate pressure cylinder steam inlet regulating valve 45 and the #2 intermediate pressure cylinder steam inlet flowmeter 46 installed on the cylinder steam inlet pipe 38 regulate the amount of steam flowing to each intermediate pressure cylinder. The #1 intermediate pressure cylinder steam inlet regulating valve 28 is connected to the #1 bypass branch pipe 55 to the low-pressure bypass, and the #2 intermediate pressure cylinder steam inlet regulating valve 45 is connected to the #2 bypass branch pipe 56 to the low-pressure bypass. When the steam inlet to the #1 intermediate pressure cylinder 6 exceeds the amount, the #1 bypass branch pipe 55 will bypass part of the steam. When the steam inlet to the #2 intermediate pressure cylinder 8 exceeds the amount of steam, the #2 bypass branch pipe 56 will bypass part of the steam. The #1 heat recovery water supply pipe 17 of the #1 boiler 9 and the #2 heat recovery water supply pipe 34 of the #2 boiler 11 converge into the water supply main pipe 4. The #1 heat recovery water supply pipe 17 is provided with a #1 booster pump 51, and the #2 heat recovery water supply pipe 34 is provided with a #2 booster pump 52. The water supply main pipe 4 is connected to the #1 boiler 9 through the #1 heat recovery water inlet pipe 18, and the water supply main pipe 4 is connected to the #2 boiler 11 through the #2 heat recovery water inlet pipe 35. At the same time, the #1 heat recovery water inlet pipe 18 is provided with a #1 water supply regulating valve 23 and a #1 water supply flow meter 24, and the #2 heat recovery water inlet pipe 35 is provided with a #2 water supply regulating valve 40 and a #2 water supply flow meter 41, completing the system water supply cycle.

[0046] In summary, the embodiment of the present application provides a multi-machine boiler main pipe interoperation system, which connects all the main pipes of the system related to the boiler main steam, reheat, and feed water. The differences between the local boiler and the turbine, and between the boilers and turbines of different units are used to configure the system according to the main steam and reheat requirements of the boiler, and also adapt to the needs of the turbine. Through various adjustment means set up in this system, the main steam, cold reheat, hot reheat, and feed water parameters can be made consistent with the operating requirements of various equipment in the system, and the decoupling of the machine and boiler and the decoupling between units can be achieved, thereby promoting the conditions for flexible operation of the units.

[0047] The above description is only a preferred embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present application should be included in the scope of protection of the present application.

Claims

1. A multi-machine boiler mother control intermodal system, characterized in that: The system comprises a plurality of boilers and a plurality of steam turbines, wherein the plurality of boilers respectively gather their main steam pipes into the same main steam header, the plurality of steam turbines correspond to the plurality of boilers one-to-one, and the main steam header distributes the main steam to the high-pressure cylinder of each steam turbine as required, the high-pressure cylinder of each steam turbine gathers the exhaust pipes into the same reheat cold section header, the reheat cold section header distributes the steam amount entering the reheater of each boiler as required through the reheat cold section pipe, the reheater of each boiler respectively gathers the reheat hot section pipes into the same reheat hot section header, and the reheat hot section header distributes the steam to the intermediate pressure cylinder of the steam turbine as required.

2. The multi-machine boiler mother pipe intermodal system according to claim 1 is characterized in that: A main steam inlet pipe is provided between the main steam main pipe and the high-pressure cylinder of the steam turbine, and a high-pressure regulating valve is provided on the main steam inlet pipe.

3. The multi-machine boiler mother pipe intermodal system according to claim 1 is characterized in that: The exhaust pipe is provided with a high-pressure exhaust regulating valve, a high-pressure exhaust check valve and a high-pressure exhaust desuperheater.

4. The multi-machine boiler mother pipe intermodal system according to claim 1 is characterized in that: The reheat cold section pipe is provided with a reheater inlet regulating valve and a reheater inlet flow meter.

5. The multi-machine boiler mother pipe intermodal system according to claim 4 is characterized in that: An auxiliary reheater is provided between the reheat cold section pipe and the reheat hot section pipe. The steam inlet pipe of the auxiliary reheater is located before the reheater inlet regulating valve, and the steam outlet pipe of the auxiliary reheater is located after the outlet of the boiler reheater.

6. The multi-machine boiler mother pipe intermodal operation system according to claim 5 is characterized in that: An auxiliary reheater steam inlet regulating valve is provided on the auxiliary reheater steam inlet pipe.

7. The multi-machine boiler mother pipe intermodal system according to claim 1 is characterized in that: An intermediate pressure cylinder steam inlet pipe is provided between the reheat hot section main pipe and the intermediate pressure cylinder of the steam turbine, and an intermediate pressure cylinder steam inlet regulating valve and an intermediate pressure cylinder steam inlet flowmeter are provided on the intermediate pressure cylinder steam inlet pipe.

8. The multi-machine boiler mother pipe intermodal system according to claim 7 is characterized in that: The intermediate pressure cylinder steam inlet pipe is externally connected to a bypass branch pipe, and the bypass branch pipe is used to discharge excess steam entering the intermediate pressure cylinder.

9. The multi-machine boiler mother pipe intermodal system according to claim 1 is characterized in that: The heat recovery water supply pipes of the plurality of boilers are combined into the same water supply main pipe, and the water supply main pipe supplies water to each boiler as needed through the heat supply water inlet pipe.

10. The multi-machine boiler mother pipe intermodal system according to claim 9 is characterized in that: The heat recovery water supply pipe is provided with a booster pump, and the heat supply water inlet pipe is provided with a water supply regulating valve and a water supply flow meter.

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