A multi-machine furnace combined transport system

Abstract

This application discloses a multi-boiler intermodal system, relating to the field of generator set technology. It includes multiple boilers and multiple steam turbines. Each boiler's main steam pipe is connected to a common main steam header. Each steam turbine corresponds one-to-one with one of the boilers. The main steam header distributes main steam to the high-pressure cylinders of each turbine as needed. Each turbine's high-pressure cylinder sends exhaust steam to the boiler reheater via a reheat cold section pipe and a reheater inlet pipe. Each reheat cold section pipe is equipped with a make-up steam pipe. Each boiler reheater sends steam to the intermediate-pressure cylinder of the turbine via a reheat hot section pipe. Each reheat hot section pipe is equipped with an extraction steam pipe. This application can ensure that the main steam, cold reheat, and hot reheat parameters are consistent with the operating requirements of each system device, and can achieve decoupling of the boiler and turbine units, promoting flexible unit operation.

Description

Technical Field

[0001] This application relates to the field of generator set technology, specifically to a multi-unit boiler intermodal system. Background Technology

[0002] Multi-unit boiler-generator interconnected mainline unit refers to a unit that connects multiple generating units with their boiler and turbine-related systems via a mainline. During operation, the traditional one-to-one correspondence between a boiler and a turbine is not present. The boiler and turbine can operate independently under wide load conditions or even be separated, improving operational flexibility when boiler-generator mismatch occurs. With increasing demands for low-carbon, high-efficiency, and flexible generating units, and the further development of rapid load change and deep peak-shaving technologies, mainline units, due to their ability to reduce boiler-generator operational dependencies and enhance operational flexibility, have significant application value in large-scale generating units.

[0003] Large generating units typically include a reheat system. The main steam and reheater are interconnected with the turbine and boiler. The main control system for large units is quite complex, with key issues including boiler reheater overheating or insufficient heating, and steam flow imbalance between the high and intermediate pressure turbine cylinders. Additionally, there are feedwater system imbalances. Improper system configuration can severely limit boiler and turbine operation, failing to meet the flexibility requirements of the main control system. Summary of the Invention

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

[0005] The technical solution adopted in this application is as follows:

[0006] A multi-boiler intermodal system includes multiple boilers and multiple steam turbines. Each of the boilers has its main steam pipes connected to the same main steam header. Each steam turbine corresponds to one of the boilers. The main steam header distributes the main steam to the high-pressure cylinders of each steam turbine as needed. The high-pressure cylinders of each steam turbine send exhaust steam to the reheaters of each boiler through reheat cold section pipes and reheater inlet pipes. Each reheat cold section pipe is equipped with a make-up steam pipe. Each boiler reheater sends steam to the intermediate-pressure cylinders of the steam turbines through reheat hot section pipes. Each reheat hot section pipe is equipped with an extraction steam pipe.

[0007] Optionally, a main steam inlet pipe is provided between the main steam header and the high-pressure cylinder of the steam turbine, and a high-pressure regulating valve is provided on the main steam inlet pipe.

[0008] Optionally, a high-pressure discharge check valve is provided on the reheat cold section pipe.

[0009] Optionally, a reheater inlet regulating valve and a reheater inlet flow meter are installed on the reheater inlet steam pipe.

[0010] 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 boiler reheater outlet.

[0011] Optionally, an auxiliary reheater inlet steam regulating valve is provided on the steam inlet pipe of the auxiliary reheater.

[0012] Optionally, the steam inlet of the extraction pipe is located between the steam outlet of the auxiliary reheater and the steam inlet of the intermediate pressure cylinder of the steam turbine.

[0013] Optionally, multiple boilers may have their respective regenerative feedwater pipes connected to a single feedwater header, which then supplies water to each boiler as needed via a heat supply inlet pipe.

[0014] Optionally, a booster pump is installed on the regenerated water supply pipe, and a water supply regulating valve and a water supply flow meter are installed on the heated water inlet pipe.

[0015] Optionally, a water supply isolation valve is provided on the water supply header, and the water supply isolation valve is located between the regenerating water supply pipes.

[0016] Compared with the prior art, the beneficial effects of this application are:

[0017] This application proposes a multi-boiler intermodal system, comprising multiple boilers and multiple steam turbines. Each boiler's main steam pipe is connected to a common main steam header. Each steam turbine corresponds one-to-one with one of the boilers, and the main steam header distributes main steam to the high-pressure cylinders of each turbine as needed. The high-pressure cylinders of each turbine send exhaust steam to the reheaters of each boiler via reheat cold section pipes and reheater inlet pipes. Each reheat cold section pipe is equipped with a make-up steam pipe. Each boiler reheater sends steam to the intermediate-pressure cylinder of each turbine via reheat hot section pipes. Each reheat hot section tube is equipped with an extraction pipe, connecting to the boiler main steam bus. The turbine cylinders of each unit continue to operate according to the original system. By installing an adjustable auxiliary reheater, imbalances between the turbine and boiler are permissible, improving the operational flexibility of the main-line unit. Simultaneously, a make-up steam pipe is installed on the reheat cold section tube. When the steam temperature is too high or too low, steam is supplied through the make-up steam pipe to maintain the boiler reheater within the normal temperature range. An extraction steam pipe is also installed on the reheat hot section tube to promptly extract the steam during make-up steam operation, preventing the turbine intermediate-pressure cylinder pressure from exceeding limits. This design eliminates turbine safety issues. Through boiler adaptation and the established adjustment mechanisms, decoupling of the boiler and turbine, as well as decoupling between units, can be achieved, facilitating flexible unit operation. Attached Figure Description

[0018] Figure 1This is a system structure diagram of the multi-furnace intermodal system provided in the embodiments of this application.

[0019] Explanation of the labels in the attached drawings:

[0020] 1-Main steam header; 2-Main steam isolation valve; 3-Feedwater isolation valve; 4-Feedwater header; 5-#1 turbine high-pressure cylinder; 6-#1 turbine intermediate-pressure cylinder; 7-#2 turbine high-pressure cylinder; 8-#2 turbine intermediate-pressure cylinder; 9-#1 boiler; 10-#1 auxiliary reheater; 11-#2 boiler; 12-#2 auxiliary reheater; 13-#1 main steam pipe; 14-#1 main steam inlet Pipes; 15-#1 Booster Pump; 16-#1 Reheat Cold Section Pipe; 17-#1 Regenerated Feed Water Pipe; 18-#1 Regenerated Inlet Water Pipe; 19-#1 Reheater Steam Inlet Pipe; 20-#1 Auxiliary Reheater Steam Inlet Pipe; 21-#1 Reheat Hot Section 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 Auxiliary reheater inlet regulating valve; 28 - #2 Booster pump; 29 - #1 High-pressure regulating valve; 30 - #2 Main steam pipe; 31 - #2 Main steam inlet pipe; 32 - #2 High-pressure regulating valve; 33 - #2 Reheat cold section pipe; 34 - #2 Regenerated feedwater pipe; 35 - #2 Regenerated feedwater pipe; 36 - #2 Reheater steam inlet pipe; 37 - Auxiliary reheater steam inlet pipe; 38 - #2 Intermediate pressure cylinder steam inlet pipe; 39 - #2 High-pressure discharge check valve; 40 - #2 Feedwater regulating valve; 41 - #2 Feedwater flow meter; 42 - #2 Reheater inlet regulating valve; 43 - #2 Reheater inlet flow meter; 44 - #2 Auxiliary reheater inlet regulating valve; 45 - #1 Make-up steam pipe; 46 - #1 Extraction steam pipe; 47 - #2 Make-up steam pipe; 48 - #2 Extraction steam pipe. Detailed Implementation

[0021] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of the embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0022] It should be noted that all directional indicators (such as up, down, left, right, front, back, etc.) in the embodiments of this application are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicator will also change accordingly.

[0023] In this application, unless otherwise expressly specified and limited, the terms "connection," "fixed," etc., should be interpreted broadly. For example, "fixed" can mean a fixed connection, a detachable connection, or an integral part; it can mean a mechanical connection or an electrical connection; it can mean a direct connection or an indirect connection through an intermediate medium; it can mean the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0024] Furthermore, if the embodiments of this application involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the meaning of "and / or" throughout the text includes three parallel solutions; for example, "A and / or B" includes solution A, solution B, or a solution where both A and B are satisfied simultaneously. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed in this application.

[0025] See attached document Figure 1 This application provides a multi-boiler intermodal system, including multiple boilers and multiple steam turbines. The main steam pipes of each boiler are connected to the same main steam header. The multiple steam turbines correspond one-to-one with the multiple boilers. The main steam header distributes the main steam to the high-pressure cylinders of each steam turbine as needed. The exhaust steam from the high-pressure cylinders of each steam turbine is sent to the reheat reheaters of each boiler through the reheat cold section pipe and the reheater inlet pipe. Each reheat cold section pipe is equipped with a make-up steam pipe. Each boiler reheater sends steam to the intermediate-pressure cylinder of the steam turbine through the reheat hot section pipe. Each reheat hot section pipe is equipped with an extraction steam pipe.

[0026] Traditional multi-boiler interconnected units with a common steam header are a classic operating mode for steam power systems in thermal power plants. The core of this mode is the interconnection of multiple boilers and turbines via a common steam header. However, in practical applications, the following problems arise:

[0027] First, because the reheat steam parameters (temperature / pressure) output by multiple boilers are different, the steam from different boilers may form local high temperature or low temperature zones after mixing in the main pipe. This can easily cause the boiler reheater to overheat or underheat after the main pipe supplies hot steam.

[0028] Second: When multiple steam turbines simultaneously adjust their inlet valves, fluctuations in the main pipe pressure cause a mismatch between the high-pressure cylinder's exhaust flow and the intermediate-pressure cylinder's demand. For example, if a steam turbine rapidly reduces its load, its high-pressure cylinder's exhaust flow decreases, but the intermediate-pressure cylinder still relies on the original reheat steam flow, resulting in a transient shortfall.

[0029] To address the aforementioned technical problems that urgently need to be solved, this application provides a multi-boiler intermodal system, comprising multiple boilers and multiple steam turbines. Each boiler's main steam pipe is connected to the same main steam header. Each steam turbine corresponds to one boiler, and the main steam header distributes the main steam to the high-pressure cylinder of each steam turbine as needed. The high-pressure cylinder of each steam turbine sends exhaust steam to the reheater of each boiler through the reheat cold section pipe and the reheater inlet pipe. Each reheat cold section pipe is equipped with a make-up steam pipe. Each boiler reheater sends steam to the intermediate-pressure cylinder of the steam turbine through the reheat hot section pipe. Each reheat hot section pipe is equipped with an extraction steam pipe.

[0030] It is not difficult to see that in this implementation method, by connecting the main steam header of the boiler, the turbine cylinders of each unit still operate according to the original system without connecting the header. At the same time, a make-up steam pipe and an extraction steam pipe are added at the steam inlet and outlet of the boiler reheater. The header can realize the on-demand distribution of steam, and the extraction and make-up steam can ensure that the boiler reheater operates at the normal temperature, without overheating or low temperature. The differences between the boiler and turbine of this unit, and between the boiler and turbine of different units, are configured according to the main steam and reheat requirements of the boiler, and are also adapted to the needs of the turbine. Through the various adjustment methods set in this system, the main steam, cold reheat, and hot reheat parameters can be made consistent with the operating requirements of each equipment in the system, and the decoupling of the boiler and turbine and the decoupling between units can be realized, which promotes the conditions for flexible operation of the units.

[0031] In this embodiment, by setting up the steam injection pipe and the steam extraction pipe, when the main steam flow of the boiler of the unit is greater than the steam flow of the high-pressure cylinder of the turbine of the unit, the steam injection pipe on the cold section pipe of the reheating section is put into the boiler reheater to supplement the low-temperature steam flow and prevent the boiler reheater from overheating. At the same time, the steam extraction pipe on the hot section pipe of the reheating section is put into use so that the steam injection does not enter the intermediate pressure cylinder of the unit, ensuring normal steam demand, avoiding the pressure of the intermediate pressure cylinder from exceeding the limit, and realizing flexible operation of the unit.

[0032] In one embodiment, the boiler combustion process generates main steam that powers the turbine. The main steam flows into the main steam header through the main steam pipe. The main steam header is equipped with a main steam isolation valve. All the steam from the 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 turbine. The main steam inlet pipe is used to send the steam in the main steam header into the high-pressure cylinder of the 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 turbine.

[0033] It is not difficult to imagine that, in this embodiment, by installing a high-pressure regulating valve on the main steam inlet pipe connecting the main steam header and the high-pressure cylinder of the turbine, the steam inlet flow of the turbine's high-pressure cylinder can be adjusted as needed. When the turbine's high-pressure cylinder requires a larger steam volume, the opening of the high-pressure regulating valve is increased to increase the steam inlet flow. Conversely, when the turbine's high-pressure cylinder requires a smaller steam volume, the opening of the high-pressure regulating valve is decreased to reduce the steam inlet flow. This allows the turbine's high-pressure cylinder to adjust the steam inlet flow as needed.

[0034] In one embodiment, the high-pressure cylinder of the steam turbine is connected to the boiler reheater at the exhaust port via a reheat cold section pipe and a reheater inlet pipe, and a high-pressure exhaust check valve is installed on the exhaust pipe.

[0035] Understandably, in this embodiment, the high-pressure exhaust check valve is installed to prevent backflow of the medium. In a steam turbine system, when steam is discharged from the high-pressure cylinder to the reheater or other parts, the check valve can prevent the steam from flowing back. For example, when the unit is shut down or malfunctions, it prevents steam from flowing back into the high-pressure cylinder, causing equipment damage or safety hazards. The installation of check valves is particularly important in multi-unit systems. Since multiple units are interconnected, the check valve can isolate the faulty unit and ensure the normal operation of other parts of the system.

[0036] In one embodiment, a reheater inlet regulating valve and a reheater inlet flow meter are provided on the reheater inlet steam pipe.

[0037] In the above embodiments, the reheater inlet regulating valve is typically used to control the flow rate and pressure entering the boiler reheater, ensuring that steam parameters meet design requirements. Simultaneously, the regulating valve adjusts the flow rate during load changes to maintain system stability, prevent excessive temperature fluctuations, and protect the reheater piping. The reheater inlet flow meter is used to monitor steam flow in real time, providing feedback signals to the control system so that the reheater inlet regulating valve can make corresponding adjustments. Furthermore, flow data may be used for efficiency calculations, optimizing combustion and steam parameters, and monitoring for anomalies, such as sudden flow changes that may indicate leaks or blockages.

[0038] In one embodiment, 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 boiler reheater outlet (i.e. before the intermediate pressure cylinder of the turbine).

[0039] In the above embodiments, it is conceivable that the boiler reheater may experience insufficient outlet steam temperature (e.g., below the design value of 540°C) due to load fluctuations, fuel changes, or equipment aging. The auxiliary reheater can reheat the steam to ensure that the steam temperature entering the intermediate pressure cylinder is stable within the range of 540–570°C, thus preventing the turbine efficiency from being reduced due to excessively low temperatures. Simultaneously, under low load or high back pressure 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 setting up an auxiliary reheater, the inlet steam parameters of the intermediate pressure cylinder can be precisely adjusted, improving the unit's thermal efficiency, enhancing operational flexibility, and protecting the turbine.

[0040] In one embodiment, an auxiliary reheater inlet steam regulating valve is provided on the steam inlet pipe of the auxiliary reheater.

[0041] In the above embodiments, by setting an auxiliary reheater inlet steam regulating valve, the steam flow rate can be precisely controlled, the heating efficiency of the auxiliary reheater can be optimized, and the overall thermal cycle efficiency can be improved. At the same time, it prevents excessive fluctuations in steam parameters, reduces thermal stress on the equipment, and extends its service life.

[0042] In one embodiment, multiple boilers connect their respective regenerative feedwater pipes to the same feedwater header, which is equipped with a feedwater isolation valve. The feedwater header supplies water to each boiler as needed through the heat supply inlet pipe.

[0043] In the above implementation, by connecting all feedwater-related systems via a main pipeline, the differences between the boiler and turbine of this unit, and between boilers and turbines of different units, are addressed through system configuration based on boiler feedwater requirements. Simultaneously, the system adapts to turbine needs. Through the feedwater regulation mechanisms set up in this system, feedwater parameters can be made consistent with the operating requirements of each piece of equipment in the system, and decoupling of the boiler and turbine, as well as between units, can be achieved, facilitating flexible unit operation. Furthermore, installing feedwater isolation valves on the main feedwater pipeline allows for physical isolation of the feedwater pipeline of a specific unit during maintenance, facilitating maintenance.

[0044] In one embodiment, a booster pump is installed on the regenerative water supply pipe, and a water supply regulating valve and a water supply flow meter are installed on the heat supply inlet pipe.

[0045] In the above implementation, the pressure of the return water decreases after flowing through equipment such as the condenser, deaerator, and heater. The booster pump raises the return water pressure to the boiler feedwater demand value (e.g., 1.5–3 MPa), ensuring that the water can overcome pipeline friction resistance and height difference. Simultaneously, when the boiler is operating at high load, the booster pump ensures that the return water flow rate matches the evaporation rate, preventing boiler water shortage (which could lead to tube rupture) or overfilling (affecting steam quality). The feedwater regulating valve can dynamically adjust the valve opening according to the boiler evaporation rate (e.g., opening the valve wider when the load increases), maintaining a stable steam drum water level (water level fluctuations must be controlled within ±10 mm). It also balances the booster pump outlet pressure and boiler inlet pressure through throttling, preventing overpressure (damage to pipelines) or underpressure (insufficient water supply). The feedwater flow meter can feed the flow data back to the DCS system, linking with the regulating valve to form a "monitoring-regulation-stabilization" closed loop, ensuring accurate flow matching of the set value.

[0046] To further illustrate the multi-unit boiler operation system provided in this application embodiment, a two-boiler, two-unit main control system is combined with an appendix. Figure 1 To clarify, #1 represents the equipment of Unit 1, and #2 represents the equipment of Unit 2. Specifically:

[0047] like Figure 1 As shown, the main steam pipes 13 and 30 of boilers 9 and 11 (boiler 9 and 11) converge at the main steam header 1. The main steam header 1 is equipped with a main steam isolation valve 2, which isolates the main steam pipes 13 and 30. The main steam isolation valve 2 can physically isolate the corresponding section of the pipeline when a boiler or turbine needs maintenance, facilitating maintenance. The main steam header 1 is connected to the high-pressure cylinder 5 of turbine #1 and the high-pressure cylinder 7 of turbine #2 through the main steam inlet pipe 14 of turbine #1 and the main steam inlet pipe 31 of turbine #2, respectively. The main steam inlet flow into the high-pressure cylinders 5 of turbine #1 and 7 of turbine #2 is redistributed through the high-pressure regulating valve 29 of turbine #1 and the high-pressure regulating valve 32 of turbine #2.

[0048] The exhaust steam from the high-pressure cylinder 5 of turbine #1 is connected to the reheater of boiler #1 via reheat cold section pipe 16 and reheater inlet pipe 19. The exhaust steam from the high-pressure cylinder 7 of turbine #2 is connected to the reheater of boiler #2 via reheat cold section pipe 33 and reheater inlet pipe 36. Reheat cold section pipe 16 is equipped with high-pressure exhaust regulating valve 22, and reheat cold section pipe 33 is equipped with high-pressure exhaust regulating valve 39. Reheat cold section pipe 16 is connected to make-up steam pipe 45 after high-pressure exhaust regulating valve 22, and reheat cold section pipe 33 is connected to make-up steam pipe 47 after high-pressure exhaust regulating valve 39. The regulation target is the high exhaust low value of the two turbines.

[0049] The #1 reheater inlet pipe 19 is equipped with a #1 reheater inlet regulating valve 25 and a #1 reheater inlet flow meter 26, and the #2 reheater inlet pipe 36 is equipped with a #2 reheater inlet regulating valve 42 and a #2 reheater inlet flow meter 43.

[0050] A #1 auxiliary reheater 10 is installed between the #1 reheat cold section pipe 16 and the #1 reheat hot section pipe 21 of boiler #1. A #2 auxiliary reheater 12 is installed between the #2 reheat cold section pipe 33 and the #2 reheat hot section pipe 48 of boiler #2. The #1 auxiliary reheater 10 is located before the #1 reheater inlet regulating valve 25 of boiler #1 and after the reheater outlet of boiler #1 (before the steam inlet of #1 intermediate pressure cylinder 6). The #2 auxiliary reheater 12 is located before the #2 reheater inlet regulating valve 42 of boiler #2 and after the reheater outlet of boiler #2 (before the steam inlet of #1 intermediate pressure cylinder 8). A #1 auxiliary reheater inlet regulating valve 27 is installed on the #1 auxiliary reheater inlet pipe 20, and a #2 auxiliary reheater inlet regulating valve 44 is installed on the #2 auxiliary reheater inlet pipe 37.

[0051] Steam heated by the reheaters of boilers #1 and #2 enters the intermediate-pressure cylinder 6 of turbine #1 and the intermediate-pressure cylinder 8 of turbine #2 respectively through reheat hot section pipe 21 of boiler #1 and reheat hot section pipe 38 of boiler #2. A #1 extraction pipe 46 is installed on reheat hot section pipe 21 of boiler #1, with its inlet located after the outlet of auxiliary reheater 10 of boiler #1 and before the inlet of intermediate-pressure cylinder 6 of turbine #1. A #2 extraction pipe 48 is installed on reheat hot section pipe 38 of boiler #2, with its inlet located after the outlet of auxiliary reheater 10 and before the inlet of intermediate-pressure cylinder 6 of turbine #1. The steam end is located after the steam outlet of the #2 auxiliary reheater 12 and before the steam inlet of the intermediate pressure cylinder 8 of the #2 turbine. When the main steam flow of the boiler in the unit is greater than the steam flow of the high pressure cylinder of the turbine, the make-up steam pipe on the cold section of the reheating tube is put into operation to supplement the low-temperature steam flow into the boiler reheater, preventing the boiler reheater from overheating. At the same time, the extraction steam pipe on the hot section of the reheating tube is put into operation to prevent this make-up steam from entering the intermediate pressure cylinder of the unit, ensuring normal steam demand, avoiding the pressure of the intermediate pressure cylinder from exceeding the limit, and realizing flexible operation of the unit.

[0052] The #1 regenerative feedwater pipe 17 of boiler #1 and the #2 regenerative feedwater pipe 34 of boiler #2 merge into the feedwater header 4. The feedwater header 4 is equipped with a feedwater isolation valve 3. The #1 regenerative feedwater pipe 17 is equipped with a #1 booster pump 15, and the #2 regenerative feedwater pipe 34 is equipped with a #2 booster pump 28. The feedwater header 4 is connected to boiler #1 through the #1 regenerative inlet pipe 18, and to boiler #2 through the #2 regenerative inlet pipe 35. At the same time, the #1 regenerative inlet pipe 18 is equipped with a #1 feedwater regulating valve 23 and a #1 feedwater flow meter 24, and the #2 regenerative inlet pipe 35 is equipped with a #2 feedwater regulating valve 40 and a #2 feedwater flow meter 41, thus completing the system's water supply circulation.

[0053] In summary, the multi-unit boiler-turbine intermodal system provided in this application connects the main steam and feedwater systems of the boiler via a central pipe. Each turbine cylinder of each unit continues to operate according to its original system. By installing an adjustable auxiliary reheater, imbalances between the turbine and boiler are allowed, improving the operational flexibility of the central pipe units. Simultaneously, a make-up steam pipe is installed on the cold reheat section tubes. When the steam temperature is too high or too low, steam is supplied through the make-up steam pipes to maintain the boiler reheater within the normal temperature range. An extraction steam pipe is installed on the hot reheat section tubes to promptly extract the steam during make-up steam operation, preventing the intermediate pressure cylinder of the turbine from exceeding its limits. This solution eliminates any safety issues with the turbine itself. By adapting to the boiler and implementing adjustment mechanisms, decoupling between the boiler and turbine, as well as between units, can be achieved, facilitating flexible unit operation.

[0054] The above description is only a preferred embodiment of this application and is not intended to limit this application. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A multi-furnace intermodal transport system, characterized in that, The system includes multiple boilers and multiple steam turbines. Each of the boilers connects its main steam pipe to the same main steam header. Each steam turbine corresponds to one of the boilers. The main steam header distributes the main steam to the high-pressure cylinders of each steam turbine as needed. The high-pressure cylinders of each steam turbine send exhaust steam to the reheaters of each boiler through the reheat cold section pipe and the reheater inlet pipe. Each reheat cold section pipe is equipped with a make-up steam pipe. Each boiler reheater sends steam to the intermediate-pressure cylinder of the steam turbine through the reheat hot section pipe. Each reheat hot section pipe is equipped with an extraction steam pipe.

2. The multi-furnace intermodal transport system according to claim 1, characterized in that, A main steam inlet pipe is provided between the main steam header 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-furnace intermodal transport system according to claim 1, characterized in that, A high-pressure check valve is installed on the reheat cold section pipe.

4. The multi-furnace intermodal transport system according to claim 1, characterized in that, The reheater inlet pipe is equipped with a reheater inlet regulating valve and a reheater inlet flow meter.

5. The multi-furnace intermodal transport system according to claim 4, characterized in that, 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 boiler reheater outlet.

6. The multi-furnace intermodal transport system according to claim 5, characterized in that, An auxiliary reheater inlet steam regulating valve is installed on the steam inlet pipe of the auxiliary reheater.

7. The multi-furnace intermodal transport system according to claim 5, characterized in that, The steam inlet of the extraction pipe is located between the steam outlet of the auxiliary reheater and the steam inlet of the intermediate pressure cylinder of the steam turbine.

8. The multi-furnace intermodal transport system according to claim 1, characterized in that, The multiple boilers mentioned above connect their respective regenerative feedwater pipes to the same feedwater header, and the feedwater header supplies water to each boiler as needed through the heating water inlet pipe.

9. The multi-furnace intermodal transport system according to claim 8, characterized in that, A booster pump is installed on the regenerated water supply pipe, and a water supply regulating valve and a water supply flow meter are installed on the heated water inlet pipe.

10. The multi-furnace intermodal transport system according to claim 8, characterized in that, A water supply isolation valve is installed on the water supply header, and the water supply isolation valve is located between the regenerating water supply pipes.

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