Cogeneration unit deep adjustment steam supply system coupled with steam compressor

Abstract

The embodiment of the utility model provides a deep adjustment steam supply system of a cogeneration unit coupled with a steam compressor. The deep adjustment steam supply system comprises a reheat steam pipeline, a first steam supply branch pipeline, a second steam supply branch pipeline, a steam supply mother pipeline, the steam compressor, an intermediate connection door, a main steam pipeline, a high-pressure cylinder, an intermediate-pressure cylinder and a low-pressure cylinder, wherein the main steam pipeline, the high-pressure cylinder, the intermediate-pressure cylinder and the low-pressure cylinder are connected in sequence. An inlet of the first steam supply branch pipeline and an inlet of the second steam supply branch pipeline are selectively connected with an outlet of the reheat steam pipeline; an outlet of the first steam supply branch pipeline and an outlet of the second steam supply branch pipeline are selectively connected with an inlet of the steam supply mother pipeline; an outlet of the steam supply mother pipeline is used for being connected with an industrial steam user; the steam compressor is arranged on the second steam supply branch pipeline; and the intermediate connecting door is arranged on a connecting pipeline between the reheat steam pipeline and the intermediate pressure cylinder. According to the system, the steam compressor and related pipelines are additionally arranged, the heat supply capacity of the cogeneration unit in the deep adjustment period is further improved, and meanwhile the operation economical efficiency of the unit is improved.

Description

TECHNICAL FIELD

[0001] The embodiment of the present disclosure belongs to the technical field of heat supply of thermal power steam turbine, and particularly relates to a deep regulation steam supply system of a cogeneration unit coupled with a steam compressor. BACKGROUND

[0002] China strives to achieve the goal of carbon peak before 2030 and carbon neutrality before 2060, which puts forward higher requirements for optimizing energy structure and clean and efficient utilization of coal. Coal-fired unit transformation and upgrading is an important means to improve the utilization efficiency of coal, reduce the consumption of coal, and promote the consumption of clean energy, which is of great significance to the realization of the goal of carbon peak and carbon neutrality.

[0003] At present, the heat re-extraction transformation based on the participation of the middle joint door is a widely used steam supply scheme. The steam extracted from the heat re-steam main pipe meets the industrial steam supply demand after being reduced in temperature and pressure, and the irreversible transformation of the boiler is not required, so the technology has less risk and large extraction amount. However, in the process of deep regulation of the unit, as the load decreases, the smaller the opening of the middle joint door, the greater the throttling loss of the system, and the poorer the economic efficiency of the unit operation. At the same time, as the load of the unit decreases, in order to maintain the steam supply pressure, the steam supply flow also decreases.

[0004] In view of the above problems, it is necessary to provide a deep regulation steam supply system of a cogeneration unit coupled with a steam compressor, which is reasonable in design and can effectively improve the above problems. CONTENT OF THE UTILITY MODEL

[0005] The embodiment of the present disclosure aims to at least solve one of the technical problems existing in the prior art, and provides a deep regulation steam supply system of a cogeneration unit coupled with a steam compressor.

[0006] The embodiment of the present disclosure provides a deep regulation steam supply system of a cogeneration unit coupled with a steam compressor, which comprises a reheated steam pipeline, a first steam supply branch pipeline, a second steam supply branch pipeline, a steam supply main pipeline, a steam compressor, a middle joint door and a main steam pipeline, a high-pressure cylinder, a medium-pressure cylinder and a low-pressure cylinder connected in sequence.

[0007] The inlet of the first steam supply branch pipeline and the inlet of the second steam supply branch pipeline are selectively connected with the outlet of the reheated steam pipeline;

[0008] The outlet of the first steam supply branch pipeline and the outlet of the second steam supply branch pipeline are selectively connected with the inlet of the steam supply main pipeline;

[0009] The outlet of the steam supply main pipeline is used to be connected with an industrial steam user;

[0010] The steam compressor is arranged in the second steam supply branch pipeline;

[0011] The intermediate joint is arranged between the reheating steam pipe and the intermediate pressure cylinder.

[0012] Optionally, the system further comprises an electric motor, wherein the electric motor is configured to drive the steam compressor.

[0013] Optionally, the electric motor is a turbine-driven electric motor.

[0014] Optionally, the system further comprises a desuperheater, wherein the desuperheater is arranged in the reheating steam pipe.

[0015] Optionally, the system further comprises a first electric valve.

[0016] The first electric valve is arranged in the reheating steam pipe.

[0017] Optionally, the system further comprises a first check valve.

[0018] The first check valve is arranged in the reheating steam pipe and connected to the first electric valve.

[0019] Optionally, the system further comprises a second electric valve.

[0020] The second electric valve is arranged in the first steam supply branch pipe.

[0021] Optionally, the system further comprises a third electric valve.

[0022] The third electric valve is arranged in the second steam supply branch pipe, and the third electric valve is located between the steam compressor and an outlet of the reheating steam pipe.

[0023] Optionally, the system further comprises a fourth electric valve.

[0024] The fourth electric valve is arranged in the second steam supply branch pipe, and the fourth electric valve is located between the steam compressor and an inlet of the steam supply main pipe.

[0025] Optionally, the system further comprises a second check valve.

[0026] The second check valve is arranged in the second steam supply branch pipe, and the second check valve is located between the fourth electric valve and the inlet of the steam supply main pipe.

[0027] The deep regulation steam supply system of the combined heat and power unit coupled with the steam compressor according to the embodiments of the present disclosure, by adding a steam compressor and a related pipe system,

[0028] The central valve is not subject to regulation. The first steam supply branch pipe is connected to both the reheat steam pipe and the main steam supply pipe. During deep peak shaving operation of the cogeneration unit, the central valve is regulated. The second steam supply branch pipe is connected to both the reheat steam pipe and the main steam supply pipe. The steam is pressurized by the steam compressor on the second steam supply branch pipe before being delivered to industrial steam users. In high-flow operation, the steam compressor of this system can calculate the balance point between the power consumption of the steam compressor unit and the economic decline caused by the central valve regulation, based on the actual steam supply parameters. Under specific conditions, the central valve does not need to be opened to its lowest point; operating the steam compressor can improve the overall operating economy of the unit. This system has a small scope of modification, low investment cost, and high operational reliability, making it suitable for further promotion and application. Attached Figure Description

[0029] Figure 1 This is a schematic diagram of the structure of a deep-temperature steam supply system for a cogeneration unit with a coupled steam compressor, as described in one embodiment of this disclosure. Detailed Implementation

[0030] To enable those skilled in the art to better understand the technical solutions of the embodiments of this disclosure, the embodiments of this disclosure will be further described in detail below with reference to the accompanying drawings and specific implementation methods.

[0031] like Figure 1 As shown, this embodiment of the present disclosure provides a deep-adjustment steam supply system for a cogeneration unit coupled with a steam compressor, including a reheat steam pipeline 1, a first steam supply branch pipeline 2, a second steam supply branch pipeline 3, a main steam supply pipeline 4, a steam compressor 5, a central valve 6, and a main steam pipeline 7, a high-pressure cylinder 8, a medium-pressure cylinder 9, and a low-pressure cylinder 10 connected in sequence.

[0032] The inlet of the first steam supply branch pipe 2 and the inlet of the second steam supply branch pipe 3 are selectively connected to the outlet of the reheat steam pipe 1.

[0033] The outlet of the first steam supply branch pipe 2 and the outlet of the second steam supply branch pipe 3 are selectively connected to the inlet of the main steam supply pipe 4.

[0034] The outlet of steam supply main pipeline 4 is used to connect to industrial steam users.

[0035] The steam compressor 5 is located in the second steam supply branch pipe 3.

[0036] The central valve 6 is installed in the connecting pipe between the reheat steam pipe 1 and the intermediate pressure cylinder 9.

[0037] Specifically, when the unit load is high, at this time the heat re-pressing force can meet the steam supply demand, the middle joint door does not participate in the adjustment, at this time the throttling loss is small, the original system of the unit is used to supply steam: the reheat steam pipeline 1 is connected with the first steam supply branch pipeline 2, the first steam supply branch pipeline 2 is connected with the steam supply main pipeline 4, and the reheat steam is sequentially transported to the industrial steam user through the reheat steam pipeline 1, the first steam supply branch pipeline 2 and the steam supply main pipeline 4.

[0038] When the combined heat and power unit is deeply peak-regulating, at this time the heat re-pressing force cannot meet the steam supply demand, the middle joint door 6 has participated in the adjustment, at this time the throttling loss of the unit is large, with the decrease of the load, the opening of the middle joint door 6 has reached the minimum opening, at this time with the decrease of the load, it is difficult to maintain the steam supply pressure, at this time, in order to ensure the steam supply pressure, the connection between the reheat steam pipeline 1 and the first steam supply branch pipeline 2 is disconnected, the reheat steam pipeline 1 is connected with the second steam supply branch pipeline 3, the second steam supply branch pipeline 3 is connected with the steam supply main pipeline 4, and the steam compressor 5 is opened, the heat re-steam enters the steam compressor 5, is pressurized, and is sequentially transported to the industrial steam user through the second steam supply branch pipeline 3 and the steam supply main pipeline 4.

[0039] The combined heat and power unit deep-regulating steam supply system coupled with the steam compressor in the embodiment of the present disclosure, by additionally arranging the steam compressor and the related pipeline system, when the unit load is high, the middle joint door does not participate in the adjustment, the first steam supply branch pipeline is connected with the reheat steam pipeline and the steam supply main pipeline respectively; when the combined heat and power unit is deeply peak-regulating, the middle joint door participates in the adjustment, the second steam supply branch pipeline is connected with the reheat steam pipeline and the steam supply main pipeline respectively, and the steam compressor on the second steam supply branch pipeline pressurizes the steam supply and then transports the steam supply to the industrial steam user. The steam compressor of the system can balance the point of the unit economic decline caused by the participation of the middle joint door in the large-flow operation according to the actual steam supply parameters, under specific conditions, the opening of the middle joint door does not need to reach the lowest point, and the operation of the steam compressor can improve the operation economy of the whole unit. The system has small modification range, low investment cost and high operation reliability, and is beneficial to further popularization and application.

[0040] For example, as shown in the figure, the system further includes an electric motor 11, and the electric motor 11 is used to drive the steam compressor 5. The electric motor 11 can adopt a steam-driven electric motor. Figure 1 It should be noted that: the driving form of the steam compressor 5 in the system is driven by the electric motor 11, and in actual application, a steam turbine can be used to replace the electric motor according to actual needs, and the steam source of the steam turbine can be taken from the unit steam extraction system.

[0041]

[0042] ​It needs to be further explained that the steam compressor 5 in the large flow operation can calculate the power consumption of the steam compressor unit and the balance point of the economic decline of the middle joint door 6 according to the actual steam supply parameters. Under certain conditions, the middle joint door 6 does not need to be opened to the lowest point, and the operation of the steam compressor 5 can improve the operation economy of the whole unit.

[0043] As shown in the example, Figure 1 The system further comprises a desuperheater 12, which is arranged in the reheated steam pipeline 1. The reheated steam is sent to the industrial steam user after being desuperheated by the desuperheater 12 to meet the demand of the industrial steam user.

[0044] As shown in the example, Figure 1 The system further comprises a first electric valve 13, which is arranged in the reheated steam pipeline 1 and used to control the opening or closing of the reheated steam pipeline 1.

[0045] As shown in the example, Figure 1 The system further comprises a first check valve 14, which is arranged in the reheated steam pipeline 1 and connected with the first electric valve 13. The first check valve 14 can prevent the reheated steam in the reheated steam pipeline 1 from flowing back.

[0046] As shown in the example, Figure 1 The system further comprises a second electric valve 15, which is arranged in the first steam supply branch pipeline 2. The second electric valve 15 can control the communication or disconnection of the reheated steam pipeline 1 and the first steam supply branch pipeline 2.

[0047] As shown in the example, Figure 1 The system further comprises a third electric valve 16, which is arranged in the second steam supply branch pipeline 3. The third electric valve 16 is located between the steam compressor 5 and the outlet of the reheated steam pipeline 1. The third electric valve 16 is used to control the opening or closing of the steam supply branch pipeline upstream of the steam compressor 5.

[0048] As shown in the example, Figure 1 The system further comprises a fourth electric valve 17, which is arranged in the second steam supply branch pipeline 3. The fourth electric valve 17 is located between the steam compressor 5 and the inlet of the steam supply main pipeline 4. The fourth electric valve 17 is used to control the opening or closing of the steam supply branch pipeline downstream of the steam compressor 5.

[0049] As shown in the example, Figure 1As shown, the system also includes a second check valve 18; the second check valve 18 is disposed in the second steam supply branch pipe 3, wherein the second check valve 18 is located between the fourth electric valve 17 and the inlet of the main steam supply pipe 4. By providing the second check valve 18, backflow of steam in the second steam supply branch pipe 4 can be prevented.

[0050] like Figure 1 As shown in the figure, the working principle of a deep-tuning steam supply system for a cogeneration unit with coupled steam compressor according to an embodiment of this disclosure can be as follows:

[0051] When the unit load is high, the reheat pressure can meet the steam supply demand. The intermediate valve is not adjusted, and the throttling loss is small. The original system of the unit is used for steam supply: the first electric valve 13, the first check valve 14 and the second electric valve 15 are opened to connect the reheat steam pipeline 1 with the first steam supply branch pipeline 2. The reheat steam is then transported to the industrial steam users through the reheat steam pipeline 1, the first steam supply branch pipeline 2 and the main steam supply pipeline 4 in sequence.

[0052] When the cogeneration unit is operating under deep peak shaving conditions, the reheat pressure can no longer meet the steam supply demand. The intermediate valve 6 is already under control, resulting in significant throttling losses. As the load decreases, the opening of the intermediate valve 6 reaches its minimum. Furthermore, maintaining the steam supply pressure becomes difficult. To ensure the steam supply pressure, the second electric valve 15 is closed, while the first electric valve 13 and the first check valve 14 remain open, disconnecting the reheat steam pipeline 1 from the first steam supply branch pipeline 2. Then, the third electric valve 16, the fourth electric valve 17, the second check valve 18, the steam compressor 5, and the motor 11 are opened, connecting the reheat steam pipeline 1 to the second steam supply branch pipeline 3. The reheat steam enters the steam compressor 5, is pressurized, and then sequentially passes through the second steam supply branch pipeline 3 and the main steam supply pipeline 4 to the industrial steam users.

[0053] It is understood that the above embodiments are merely exemplary implementations used to illustrate the principles of the embodiments of this disclosure, and the embodiments of this disclosure are not limited thereto. For those skilled in the art, various modifications and improvements can be made without departing from the spirit and essence of the embodiments of this disclosure, and these modifications and improvements are also considered to be within the protection scope of the embodiments of this disclosure.

Claims

1. A cogeneration unit deep letdown steam system coupled to a vapor compressor, characterized by, The system comprises a reheating steam pipeline, a first steam supply branch pipeline, a second steam supply branch pipeline, a steam supply main pipeline, a steam compressor, a middle connection door, and a main steam pipeline, a high-pressure cylinder, a middle-pressure cylinder, and a low-pressure cylinder connected in sequence; an inlet of the first steam supply branch pipeline and an inlet of the second steam supply branch pipeline are selectively connected with an outlet of the reheating steam pipeline; an outlet of the first steam supply branch pipeline and an outlet of the second steam supply branch pipeline are selectively connected with an inlet of the steam supply main pipeline; an outlet of the steam supply main pipeline is used for being connected with an industrial steam user; the steam compressor is arranged in the second steam supply branch pipeline; the middle connection door is arranged in a connecting pipeline between the reheating steam pipeline and the middle-pressure cylinder.

2. The system of claim 1, wherein, The system further comprises an electric motor used for driving the steam compressor.

3. The system of claim 2, wherein, The electric motor is a turbine-driven electric motor.

4. The system according to any one of claims 1 to 3, characterized in that, The system further comprises an attemperator arranged in the reheating steam pipeline.

5. The system according to any one of claims 1 to 3, characterized in that, The system further comprises a first electric valve. The first electric valve is arranged in the reheating steam pipeline.

6. The system of claim 5, wherein, The system further comprises a first check valve. The first check valve is arranged in the reheating steam pipeline and is connected with the first electric valve.

7. The system of any one of claims 1 to 3, wherein, The system further comprises a second electric valve. The second electric valve is arranged in the first steam supply branch pipeline.

8. The system of any one of claims 1 to 3, wherein, The system further comprises a third electric valve. The third electric valve is arranged in the second steam supply branch pipeline, and the third electric valve is located between the steam compressor and the outlet of the reheating steam pipeline.

9. The system of any one of claims 1 to 3, wherein, The system further comprises a fourth electric valve. The fourth electric valve is arranged in the second steam supply branch pipeline, and the fourth electric valve is located between the steam compressor and the inlet of the steam supply main pipeline.

10. The system of claim 9, wherein, The system further comprises a second check valve. The second check valve is arranged in the second steam supply branch pipeline, and the second check valve is located between the fourth electric valve and the inlet of the steam supply main pipeline.

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