Comprehensive utilization system for waste heat steam of nuclear power plant

Abstract

The invention provides a nuclear power plant waste heat steam comprehensive utilization system and method.The utilization system comprises a steam supply pipeline, a dragging steam turbine and a heat supply flow path, and the steam supply pipeline is provided with a first steam supply branch and a second steam supply branch; the dragging steam turbine is connected with the first steam supply branch; the heat supply flow path is connected with at least one steam compressor, the dragging steam turbine is in driving connection with the steam compressor so as to provide driving force for the steam compressor, and the tail end of the heat supply flow path is connected with at least one type of heat users. According to the nuclear power plant waste heat steam comprehensive utilization system, the dragging steam turbine is adopted as a driving part of the steam compressor, on one hand, external electric power is omitted, and energy consumption is reduced; and on the other hand, the usage amount of the to-be-compressed steam is increased, and the problem of energy waste is better solved.

Description

Technical Field

[0001] The invention relates to the technical field of waste heat steam utilization in nuclear power plants, and in particular to a comprehensive utilization system of waste heat steam in nuclear power plants. Background Art

[0002] Many industrial systems, such as nuclear power plants, will produce a large amount of relatively low-quality water vapor when completing basic production tasks. The parameters of this water vapor are relatively low. For example, the steam temperature is around 200 degrees Celsius and the pressure is around 1MPa. Water vapor under these parameters is difficult to use and can only be discarded.

[0003] In the existing scheme, some enterprises use electric-driven compressors to pressurize and heat this part of water vapor to supply gas and heating to local enterprises or residents. However, the additional water vapor has low parameters and is difficult to use, resulting in waste. Or the use of electric-driven compressors requires the introduction of external energy, which has a low effective utilization rate and is limited by the total demand. It is difficult to fully utilize this part of energy, and thus it is impossible to completely solve the problem of energy waste.

[0004] Based on this, the inventor of the present application proposes a comprehensive utilization system and method of waste heat steam from a nuclear power plant in order to solve the above-mentioned technical problems. Summary of the invention

[0005] The technical problem to be solved by the present invention is to overcome the defect of low utilization rate of low-parameter steam in nuclear power plants in the prior art, and to provide a comprehensive utilization system and method of waste heat steam in nuclear power plants.

[0006] The present invention solves the above technical problems through the following technical solutions:

[0007] The present invention provides a nuclear power plant waste heat steam comprehensive utilization system, which is characterized by comprising:

[0008] A steam supply pipeline having a first steam supply branch and a second steam supply branch;

[0009] Driving a steam turbine connected to the first steam supply branch;

[0010] The heat supply flow path is connected to at least one steam compressor, the traction steam turbine is drivingly connected to the steam compressor to provide driving force for the steam compressor, and the end of the heat supply flow path is connected to at least one type of heat user.

[0011] According to one embodiment of the present invention, the traction steam turbine is connected to the steam compressor via a coupling or a gear box.

[0012] According to one embodiment of the present invention, the number of the steam compressors is at least two, and at least two of the steam compressors are connected in series;

[0013] A control switching valve is provided between adjacent steam compressors, and at least two heating branches are provided on the heating flow path. Each of the heating branches is connected to the control switching valve to adjust the number of the steam compressors participating in compression on the heating flow path.

[0014] According to one embodiment of the present invention, the number of the heat users is at least two, and they are arranged in parallel downstream of the heat supply flow path.

[0015] According to one embodiment of the present invention, a first control valve is provided on the first steam supply branch line, and a second control valve is provided on the second steam supply branch line;

[0016] It also includes a controller, which is electrically connected to the control switching valve, the first control valve and the second control valve respectively.

[0017] According to one embodiment of the present invention, a first flow meter is provided on the steam supply pipeline, a second flow meter is provided on the first steam supply branch, and a third flow meter is provided on the second steam supply branch;

[0018] The controller is electrically connected to the first flow meter, the second flow meter and the third flow meter respectively.

[0019] According to an embodiment of the present invention, a monitoring component is provided on each of the heating branches, and the monitoring component is used to detect the parameters of the steam output by the steam compressor.

[0020] According to an embodiment of the present invention, the steam parameters include but are not limited to steam temperature and steam pressure.

[0021] The present invention also provides a method for comprehensive utilization of waste heat steam from a nuclear power plant, which is implemented by using the comprehensive utilization system for waste heat steam from a nuclear power plant as described above, and is characterized in that the utilization method comprises:

[0022] Step 1: Adjust the steam intake required to drive the steam turbine;

[0023] Step 2: Under the drive of the traction steam turbine, adjust different numbers of the steam compressors to participate in compression to obtain steam with different parameters.

[0024] According to one embodiment of the present invention, step 2 further includes:

[0025] The steam compressor in the non-working state is controlled to be in an idling state.

[0026] The positive and progressive effects of the present invention are:

[0027] The nuclear power plant waste heat steam comprehensive utilization system of the present invention adopts a traction steam turbine as a driving part of the steam compressor, which eliminates the use of external electricity and reduces energy consumption; on the other hand, it increases the use of steam to be compressed, which is more conducive to solving the problem of energy waste. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] The above and other features, properties and advantages of the present invention will become more apparent through the following description in conjunction with the accompanying drawings and embodiments, in which:

[0029] Figure 1 This is a schematic diagram of the structure of the comprehensive utilization system of waste heat steam from a nuclear power plant according to the present invention;

[0030] Figure 2 It is a structural schematic diagram of the heat supply flow path of the present invention;

[0031] Figure 3 The present invention is a flow chart of the method for comprehensive utilization of waste heat steam from a nuclear power plant.

[0032] 1. Steam supply pipeline; 11. First steam supply branch; 111. First control valve; 12. Second steam supply branch; 121. Second control valve; 13. Controller; 14. First flow meter; 15. Second flow meter; 16. Third flow meter;

[0033] 2. Driving steam turbine;

[0034] 3. Heating flow path; 31. Steam compressor; 32. Control switching valve; 33. Heating branch; 331. Monitoring component;

[0035] 4. Heat users. DETAILED DESCRIPTION

[0036] The present invention is further described below in conjunction with specific embodiments and drawings. More details are elaborated in the following description to facilitate a full understanding of the present invention. However, the present invention can obviously be implemented in a variety of other ways different from the description herein. Those skilled in the art can make similar generalizations and deductions based on actual application situations without violating the connotation of the present invention. Therefore, the protection scope of the present invention should not be limited by the content of this specific embodiment.

[0037] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by technicians in the technical field to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" in the specification and claims of this application and the above-mentioned figure descriptions and any variations thereof are intended to cover non-exclusive inclusions.

[0038] Please refer to Figure 1 and Figure 2 The present invention proposes a comprehensive utilization system of waste heat steam in a nuclear power plant. The comprehensive utilization system includes a steam supply pipeline 1, a traction steam turbine 2 and a heat supply flow path 3. The steam supply pipeline 1 has a first steam supply branch 11 and a second steam supply branch 12. The source of the steam supply pipeline 1 is low-quality water vapor generated by power generation in the nuclear power plant. The steam supply pipeline 1 is a main line, and the first steam supply branch 11 and the second steam supply branch 12 are branches connected in parallel with the steam supply pipeline 1.

[0039] The driving steam turbine 2 is connected to the first steam supply branch 11. At least one steam compressor 31 is connected to the heat supply flow path 3. The driving steam turbine 2 is drivingly connected to the steam compressor 31 to provide driving force for the steam compressor 31. At least one type of heat user 4 is connected to the end of the heat supply flow path 3.

[0040] That is, the driving mechanism for providing driving force for the steam compressor 31 is a traction steam turbine 2, which consumes steam and then provides driving force for the operation of the steam compressor 31, thereby increasing the utilization of low-quality water vapor generated by the nuclear power plant.

[0041] At present, the amount of steam generated by nuclear power plants exceeds the steam consumption of the steam compressor 31. Therefore, the present invention does not use traditional motors or other driving mechanisms to drive the steam compressor 31, but uses a traction steam turbine 2. This saves electricity on the one hand and increases steam consumption on the other.

[0042] The traction steam turbine 2 and the steam compressor 31 can be connected through a coupling. At this time, the traction steam turbine 2 and the steam compressor 31 are arranged in one direction, so the output shaft of the traction steam turbine 2 can be connected to the rotating shaft in the steam compressor 31 through a coupling, thereby providing rotational force to the steam compressor 31.

[0043] Alternatively, the traction steam turbine 2 and the steam compressor 31 can also be connected through a gear box. In this case, the traction steam turbine 2 can be installed on one side of the steam compressor 31 and does not need to be arranged in the same direction. The driving force generated by the traction steam turbine 2 cooperates with the rotation of the gear box, and the gear box then transmits the rotational force to the steam compressor 31, thereby providing driving force for the steam compressor 31.

[0044] The specific driving mode of the steam turbine 2 and the steam compressor 31 can be selected according to the actual placement space, and is not limited here.

[0045] In one embodiment, the number of steam compressors 31 is at least two, and at least two steam compressors 31 are connected in series. A control switching valve 32 is provided between adjacent steam compressors 31, and at least two heat supply branches 33 are provided on the heat supply flow path 3, each heat supply branch 33 is connected to the control switching valve 32 to adjust the number of steam compressors 31 participating in compression on the heat supply flow path 3.

[0046] It can be seen that the more steam compressors 31 are involved in the heat supply flow path 3, the more stages of compression the steam can undergo, so as to obtain steam with higher parameters.

[0047] In this way, the number of steam compressors 31 participating in the heat supply flow path 3 can be adjusted as needed to match the usage requirements of different heat users 4 .

[0048] That is, the number of steam compressors 31 connected to the heating flow path 3 can be adjusted under the setting of the control switching valve 32. Multiple steam compressors 31 connected in series can compress the steam at different levels. When the number of steam compressors 31 involved in the compression is different, the final output steam parameters are also different, so that the usage requirements of different heat users 4 can be matched.

[0049] For example, when the heat user 4 needs high-parameter steam, the number of participating steam compressors 31 can be increased to obtain high-parameter steam to match the heat user 4 with the high-parameter steam usage demand.

[0050] When the heat user 4 needs relatively low-parameter steam, the number of participating steam compressors 31 can be appropriately reduced, so as to obtain relatively low-parameter steam to match the heat users with low-parameter steam usage requirements.

[0051] In one embodiment, the number of heat users 4 is at least two, and they are connected in parallel downstream of the heat supply flow path 3 .

[0052] When there are more than one heat users 4, a switch valve can be set before each heat user 4, in conjunction with a control switching valve 32 set upstream of the steam compressor 31. In this way, by adjusting the number of steam compressors 31 involved in compression, different users can obtain corresponding steam parameters.

[0053] Specifically, for example, there are three steam compressors 31, namely compressor A, compressor B, and compressor C. Compressor A compresses to obtain steam with parameter A1, compressor A and compressor B compress together to obtain steam with parameter B1, and compressor A, compressor B, and compressor C compress together to obtain steam with parameter C1. At this time, taking the number of heat users 4 as three, namely user a, user b, and user c, by adjusting the on-off of the switching valve 32 and the switch valve, user a, user b, and user c can obtain steam with parameter A1, parameter B1, and parameter C1, respectively.

[0054] In one embodiment, the first steam supply branch 11 is provided with a first control valve 111, and the second steam supply branch 12 is provided with a second control valve 121. A controller 13 is further provided outside the first steam supply branch 11 and the second steam supply branch 12, and the controller 13 is electrically connected to the control switching valve 32, the first control valve 111, and the second control valve 121, respectively, to control the opening of the first control valve 111, the second control valve 121, and the control switching valve 32.

[0055] A first control valve 111 is provided on the first steam supply branch 11 . The flow rate of steam input to the driving steam turbine 2 can be adjusted by adjusting the opening of the first control valve 111 , thereby adjusting the output power of the driving steam turbine 2 .

[0056] Correspondingly, a second control valve 121 is provided on the second steam supply branch 12 , and the flow of steam input to the steam compressor 31 can be adjusted by adjusting the opening of the second control valve 121 , so that the rated steam amount required by the steam compressor 31 can be adjusted.

[0057] In this way, the controller 13 can be used to adjust the steam quantities required by the steam compressor 31 and the steam turbine 2 on the steam supply pipeline 1, thereby meeting the power demand and steam intake demand of the steam compressor 31.

[0058] Furthermore, a first flow meter 14 is provided on the steam supply pipeline 1, a second flow meter 15 is provided on the first steam supply branch 11, a third flow meter 16 is provided on the second steam supply branch 12, and the controller 13 is electrically connected to the first flow meter 14, the second flow meter 15 and the third flow meter 16 respectively.

[0059] In this way, the controller 13 can monitor the steam flow on the main line and the branch line in real time, so that the opening of the first control valve 111 and the second control valve 121 can be adjusted as needed, thereby adjusting the amount of steam entering the steam compressor 31 and driving the steam turbine 2.

[0060] It can be seen that the steam supply pipeline 1 is provided with not only the first steam supply branch 11 and the second steam supply branch 12 but also other different pipelines. The present invention inputs the required amount of steam from the steam supply pipeline 1 through the first control valve 111 and the second control valve 121 respectively.

[0061] In one embodiment, each heating branch 33 is provided with a monitoring component 331 , and the monitoring component 331 is used to detect the parameters of the steam output by the steam compressor 31 .

[0062] Specifically, the steam parameters include but are not limited to steam temperature, steam pressure and steam flow rate. Correspondingly, the monitoring component 331 includes a temperature sensor, a pressure sensor and a flow meter, etc., which are not limited here.

[0063] The setting of the monitoring component 331 can monitor the parameters of the compressed steam before it is input to the heat user 4, so as to ensure that the parameters of the steam input to the user meet the usage requirements of the heat user 4.

[0064] In summary, the nuclear power plant waste heat steam comprehensive utilization system of the present invention adopts the traction steam turbine 2 as the driving part of the steam compressor 31, which eliminates the use of external electricity and reduces energy consumption on the one hand; on the other hand, it increases the use of steam to be compressed, which is more conducive to solving the problem of energy waste.

[0065] Please refer to Figure 3 The present invention also proposes a method for comprehensive utilization of waste heat steam from a nuclear power plant, which is implemented by using the above-mentioned comprehensive utilization system for waste heat steam from a nuclear power plant. The utilization method includes:

[0066] S1. Adjust the steam intake required to drive the steam turbine.

[0067] One end of the steam supply pipeline is connected to the exhaust pipeline of the nuclear power plant to receive the low-parameter steam generated during the power generation process of the nuclear power plant and transmit it to the traction steam turbine and the steam compressor. The driving force of the steam compressor is provided by the traction steam turbine. Using the traction steam turbine as the driving element can increase the utilization of the low-parameter steam in the nuclear power plant.

[0068] S2. Under the drive of the traction steam turbine, adjust different numbers of steam compressors to participate in compression to obtain steam with different parameters.

[0069] Multiple steam compressors are connected in series. According to the different needs of heat users, a control switching valve is used in the heat supply flow path to adjust the number of steam compressors involved in compression, so as to obtain steam with different parameters for use by heat users.

[0070] Specifically, in step 2, it also includes controlling the steam compressor in a non-working state to be in an idling state.

[0071] When the heat demand of heat users changes, the number of steam compressors connected to the heating flow path changes accordingly. In particular, when the number of connected steam compressors decreases, the steam compressors in the non-working state are kept idling to discharge the residual high-temperature steam inside in time, thereby improving the safety of the system.

[0072] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, technical terms such as "install", "connect", "connect", "fixed" and the like should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can also be a mechanical connection. For ordinary technicians in this field, the specific meanings of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0073] The present application uses specific words to describe the embodiments of the present application. For example, "one embodiment", "an embodiment", and / or "some embodiments" refer to a certain feature, structure or characteristic related to at least one embodiment of the present application. Therefore, it should be emphasized and noted that "one embodiment" or "an embodiment" or "an alternative embodiment" mentioned twice or multiple times in different positions in this specification does not necessarily refer to the same embodiment. In addition, some features, structures or characteristics in one or more embodiments of the present application can be appropriately combined.

[0074] Although the present invention is disclosed as above with preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art may make possible changes and modifications without departing from the spirit and scope of the present invention. Therefore, any modification, equivalent change and modification made to the above embodiments according to the technical essence of the present invention without departing from the content of the technical solution of the present invention shall fall within the protection scope defined by the claims of the present invention.

Claims

1. A nuclear power plant waste heat steam comprehensive utilization system, characterized in that: include: A steam supply pipeline having a first steam supply branch and a second steam supply branch; Driving a steam turbine connected to the first steam supply branch; The heat supply flow path is connected to at least one steam compressor, the traction steam turbine is drivingly connected to the steam compressor to provide driving force for the steam compressor, and the end of the heat supply flow path is connected to at least one type of heat user.

2. The nuclear power plant waste heat steam comprehensive utilization system according to claim 1, characterized in that: The traction steam turbine is connected to the steam compressor via a coupling or a gear box.

3. The nuclear power plant waste heat steam comprehensive utilization system according to claim 1, characterized in that: The number of the steam compressors is at least two, and at least two of the steam compressors are connected in series; A control switching valve is provided between adjacent steam compressors, and at least two heating branches are provided on the heating flow path. Each of the heating branches is connected to the control switching valve to adjust the number of the steam compressors participating in compression on the heating flow path.

4. The nuclear power plant waste heat steam comprehensive utilization system according to claim 3, characterized in that: The number of the heat users is at least two, and they are arranged in parallel downstream of the heat supply flow path.

5. The nuclear power plant waste heat steam comprehensive utilization system according to claim 3, characterized in that: The first steam supply branch is provided with a first control valve, and the second steam supply branch is provided with a second control valve; It also includes a controller, which is electrically connected to the control switching valve, the first control valve and the second control valve respectively.

6. The nuclear power plant waste heat steam comprehensive utilization system according to claim 5, characterized in that: The steam supply pipeline is provided with a first flow meter, the first steam supply branch is provided with a second flow meter, and the second steam supply branch is provided with a third flow meter; The controller is electrically connected to the first flow meter, the second flow meter and the third flow meter respectively.

7. The nuclear power plant waste heat steam comprehensive utilization system according to claim 3, characterized in that: A monitoring component is provided on each of the heating branches, and the monitoring component is used to detect the parameters of the steam output by the steam compressor.

8. The nuclear power plant waste heat steam comprehensive utilization system according to claim 7, characterized in that: The steam parameters include but are not limited to steam temperature and steam pressure.

9. A method for comprehensive utilization of waste heat steam from a nuclear power plant, implemented by using the comprehensive utilization system for waste heat steam from a nuclear power plant as claimed in any one of claims 1 to 8, characterized in that: The utilization method includes: Step 1: Adjust the steam intake required to drive the steam turbine; Step 2: Under the drive of the traction steam turbine, adjust different numbers of the steam compressors to participate in compression to obtain steam with different parameters.

10. The method for comprehensive utilization of waste heat steam from a nuclear power plant according to claim 9, characterized in that: The step 2 also includes: The steam compressor in the non-working state is controlled to be in an idling state.

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