Power plant condensation water adjusting system

Abstract

The utility model discloses a power plant condensation water adjusting system which comprises a condensation water assembly, a first low-pressure heater assembly, an adjusting valve assembly, a second low-pressure heater assembly and a deaerator which are sequentially arranged in the flowing direction of condensation water. The adjusting valve assembly is used for adjusting the flow of condensed water in the system so as to adjust the water level of the deaerator, a first cooling water outlet is formed in a pipeline between the first low-pressure heater assembly and the adjusting valve assembly, and a cooling water return port is formed in a pipeline between the adjusting valve assembly and the second low-pressure heater assembly; according to the utility model, the flow and the pressure in the pipeline can be adjusted, the condensed water at the position can be prevented from being influenced by outlet water and return water, the water level of the deaerator is ensured to be at a normal level, other adjusting valve assemblies do not need to be arranged at other positions, and the use cost is reduced.

Description

Technical Field

[0001] The utility model belongs to the technical field of thermal power plant equipment, and in particular relates to a condensate regulating system for a power plant. Background Art

[0002] In a thermal power plant, the main function of the condensate system is to boost the condensate in the condenser hot well by a condensate pump, and then gradually heat it through a shaft seal cooler, a main condensate regulating valve group, a drain cooler, and low-pressure heaters at various levels before transporting it to the deaerator. The main condensate regulating valve group regulates the water volume in the condensate pipeline to ensure that the water level of the deaerator is at a normal level, which plays an important role in the normal operation of the condensate system and the entire unit. However, in the prior art, because the condensate system often has multiple water outlets and return ports, multiple regulating valve groups are provided, the investment cost is high, and too many regulating valve groups cannot adapt well to changes in pipeline flow, making the regulation process difficult and also causing cost waste. Utility Model Content

[0003] The technical problem to be solved by the utility model is to provide a condensate regulating system for a power plant, which can effectively solve the problems of high investment cost, inability of the regulating valve group to adapt well to changes in pipeline flow, and difficulty in regulation in the prior art.

[0004] In order to solve the above technical problems, the technical solutions adopted by the utility model are as follows:

[0005] A condensate regulating system for a power plant, comprising a condensate assembly, a first low-pressure heater assembly, a regulating valve assembly, a second low-pressure heater assembly and a deaerator which are sequentially arranged along the flow direction of the condensate, a first cooling water outlet is provided on the pipeline between the first low-pressure heater assembly and the regulating valve assembly, a cooling water return port is provided on the pipeline between the regulating valve assembly and the second low-pressure heater assembly, the regulating valve assembly is used to regulate the condensate flow in the system to regulate the water level of the deaerator, the regulating valve assembly comprises a first regulating branch, a second regulating branch and a third regulating branch which are arranged in parallel, a first electric gate valve, a first electric regulating valve and a second electric gate valve are provided on the first regulating branch, a third electric gate valve, a second electric regulating valve and a fourth electric gate valve are provided on the second regulating branch, and a fifth electric gate valve is provided on the third regulating branch.

[0006] As a preferred solution of the utility model, the condensate assembly includes a condenser, a condensate pump, a shaft seal cooler and a drain cooler which are sequentially arranged along the flow direction of the condensate.

[0007] As a preferred solution of the present utility model, the condenser includes a first condenser and a second condenser, and the first condenser and the second condenser are arranged in parallel.

[0008] As a preferred embodiment of the present utility model, the first low-pressure heater assembly includes a first-stage low-pressure heater, a second-stage low-pressure heater and a third-stage low-pressure heater, the first-stage low-pressure heater is arranged on the first condenser, the second-stage low-pressure heater is arranged on the second condenser, the third-stage low-pressure heater is arranged between the second-stage low-pressure heater and the regulating valve group, the water inlet end of the first-stage low-pressure heater is connected to the drain cooler through a pipeline, the first-stage low-pressure heater, the second-stage low-pressure heater and the third-stage low-pressure heater are connected in sequence through pipelines, the water outlet end of the third-stage low-pressure heater is connected to the regulating valve assembly through a pipeline, and the first cooling water outlet is arranged on the pipeline between the third-stage low-pressure heater and the regulating valve assembly.

[0009] As a preferred solution of the utility model, a second cooling water outlet is provided on the pipeline between the first-level low-pressure heater and the second-level low-pressure heater.

[0010] As a preferred embodiment of the present utility model, the second low-pressure heater assembly includes a four-stage low-pressure heater, a five-stage low-pressure heater and a six-stage low-pressure heater, the water inlet end of the four-stage low-pressure heater is connected to the regulating valve assembly through a pipeline, the four-stage low-pressure heater, the five-stage low-pressure heater and the six-stage low-pressure heater are connected in sequence through pipelines, and the water outlet end of the six-stage low-pressure heater is connected to the deaerator through a pipeline.

[0011] As a preferred solution of the utility model, a check valve is provided on the water outlet end of the regulating valve assembly.

[0012] The condensate regulating system for a power plant provided by the utility model has the following beneficial effects compared with the prior art:

[0013] Since the regulating valve assembly is arranged between the first cooling water outlet and the cooling water return port, the regulating valve assembly can adjust the flow and pressure in the pipeline, prevent the condensed water here from being affected by the outlet and return water, and ensure that the water level of the deaerator is at a normal level; in addition, the corresponding electric regulating valve can be selected according to the flow of the condensed water flowing through the system, and can adapt to different condensed water flow rates. When the electric regulating valves on the first regulating branch and the second regulating branch are damaged, the third regulating branch can also be temporarily opened to allow the condensed water to pass through in full, thereby preventing the entire condensed water pipeline from being affected; by adopting the utility model, the flow and pressure in the pipeline can be adjusted, the condensed water here can be prevented from being affected by the outlet and return water, and the water level of the deaerator is at a normal level, and there is no need to set other regulating valve assemblies at other positions, thereby reducing the use cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] In order to more clearly illustrate the technical solution of the embodiment of the utility model, the drawings of the embodiment will be briefly introduced below.

[0015] Figure 1 It is a structural schematic diagram of a condensate regulating system for a power plant provided by an embodiment of the utility model;

[0016] Figure 2 It is a structural schematic diagram of a regulating valve assembly.

[0017] Markings in the figure:

[0018] Condensate assembly 100; condenser 101; first condenser 1011; second condenser 1012; condensate pump 102; shaft seal cooler 103; drain cooler 104; first low-pressure heater assembly 200; first low-pressure heater 201; second low-pressure heater 202; third low-pressure heater 203; regulating valve assembly 300; first regulating branch 301; first electric gate valve 3011; first electric regulating valve 3012; second electric gate valve 3013 ; second regulating branch 302; third electric gate valve 3021; ​​second electric regulating valve 3022; fourth electric gate valve 3023; third regulating branch 303; fifth electric gate valve 3031; check valve 304; second low-pressure heater assembly 400; fourth-level low-pressure heater 401; fifth-level low-pressure heater 402; sixth-level low-pressure heater 403; deaerator 500; first cooling water outlet 600; cooling water return port 700; second cooling water outlet 800. DETAILED DESCRIPTION

[0019] The following is a further detailed description of the specific implementation of the present invention in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0020] In the description of the present utility model, it should be understood that the terms "upper", "lower", "left", "right", "front", "back", "top", "bottom" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present utility model. It should be understood that the terms "first", "second", etc. are used in the present utility model to describe various information, but such information should not be limited to these terms, which are only used to distinguish the same type of information from each other. For example, without departing from the scope of the present utility model, the "first" information may also be referred to as the "second" information, and similarly, the "second" information may also be referred to as the "first" information.

[0021] like Figure 1 to Figure 2As shown, the preferred embodiment of the utility model provides a condensate regulating system for a power plant, which includes a condensate assembly 100, a first low-pressure heater assembly 200, a regulating valve assembly 300, a second low-pressure heater assembly 400 and a deaerator 500 arranged in sequence along the flow direction of the condensate, a first cooling water outlet 600 is provided on the pipeline between the first low-pressure heater assembly and the regulating valve assembly 300, a cooling water return port 700 is provided on the pipeline between the regulating valve assembly 300 and the second low-pressure heater assembly, and the regulating valve assembly 300 is used to regulate the cooling water. The condensate flow in the regulating system is used to regulate the water level of the deaerator 500. The regulating valve assembly 300 includes a first regulating branch 301, a second regulating branch 302 and a third regulating branch 303 arranged in parallel. The first regulating branch 301 is provided with a first electric gate valve 3011, a first electric regulating valve 3012 and a second electric gate valve 3013. The second regulating branch 302 is provided with a third electric gate valve 3021, a second electric regulating valve 3022 and a fourth electric gate valve 3023. The third regulating branch 303 is provided with a fifth electric gate valve 3031.

[0022] It should also be noted that when the flow rate of condensate flowing through the system is 0% to 30% of the pipeline, the first regulating branch 301 is opened, and the second regulating branch 302 and the third regulating branch 303 are closed;

[0023] When the flow rate of condensate flowing through the system is 30% to 100% of the pipeline, the second regulating branch 302 is opened, and the first regulating branch 301 and the third regulating branch 303 are closed.

[0024] Since the regulating valve assembly 300 is arranged between the first cooling water outlet 600 and the cooling water return port 700, the regulating valve assembly 300 can adjust the flow and pressure in the pipeline to prevent the condensate here from being affected by the outlet and return water, and ensure that the water level of the deaerator 500 is at a normal level; in addition, the corresponding electric regulating valve can be selected according to the flow of condensate flowing through the system, and can adapt to different condensate flow rates. When the electric regulating valves on the first regulating branch 301 and the second regulating branch 302 are damaged, the third regulating branch 303 can also be temporarily opened to allow the condensate to pass through in full, thereby preventing the entire condensate pipeline from being affected; by adopting the utility model, the flow and pressure in the pipeline can be adjusted to prevent the condensate here from being affected by the outlet and return water, and ensure that the water level of the deaerator 500 is at a normal level, and there is no need to set other regulating valve assemblies 300 at other positions, thereby reducing the use cost.

[0025] Exemplarily, the condensate assembly 100 includes a condenser 101, a condensate pump 102, a shaft seal cooler 103 and a drain cooler 104 which are sequentially arranged along the flow direction of the condensate.

[0026] In this embodiment, the condenser 101 is used to condense the exhaust steam of the turbine into condensate and deoxygenate; the condensate pump 102 is used to transport the condensate to the deaerator 500; the shaft seal cooler 103 heats the condensate by recovering the heat of the shaft seal steam; the drain cooler 104 heats the condensate by recovering the drain heat of the first-level low-pressure heater 201 and the second-level low-pressure heater 202.

[0027] It should also be noted that, in specific use, the positions of the cooling water outlet and the cooling water return port 700 can be adjusted according to actual needs. It only needs to ensure that the regulating valve group is set between the positions of the cooling water outlet and the cooling water return port 700. The regulating valve group can adjust the flow of the entire condensate water pipeline to prevent the condensate here from being affected by the outlet and return water, so as to avoid the layout of other regulating valve groups in other positions. This can simplify the pipeline layout of the condensate water regulation system, reduce the footprint of the regulating valve group layout, reduce the initial investment of the system, reduce the difficulty of operation and debugging, reduce the resistance of the entire pipeline, and also reduce the operating power of the condensate pump 102.

[0028] Exemplarily, the condenser 101 includes a first condenser 1011 and a second condenser 1012 , and the first condenser 1011 and the second condenser 1012 are arranged in parallel with the condenser 101 .

[0029] In this embodiment, the first low-pressure heater includes a first-stage low-pressure heater 201, a second-stage low-pressure heater 202 and a third-stage low-pressure heater 203. The first-stage low-pressure heater 201 is arranged on the first condenser 1011, the second-stage low-pressure heater 202 is arranged on the second condenser 1012, and the third-stage low-pressure heater 203 is arranged between the second-stage low-pressure heater 202 and the regulating valve group. The water inlet end of the first-stage low-pressure heater 201 is connected to the drain cooler 104 through a pipeline. The low-pressure heater 202 and the three-stage low-pressure heater 203 are interconnected in sequence through pipelines, the water outlet end of the three-stage low-pressure heater 203 is connected to the regulating valve assembly 300 through a pipeline, and the first cooling water outlet 600 is arranged on the pipeline between the three-stage low-pressure heater 203 and the regulating valve assembly 300. It can be understood that in specific use, different numbers of low-pressure heaters can be set according to actual needs, and the number and position of the first cooling water outlet 600, the second cooling water outlet 800 and the cooling water return port 700 can also be adjusted according to actual needs.

[0030] Specifically, a second cooling water outlet 800 is provided on the pipeline between the first-level low-pressure heater 201 and the second-level low-pressure heater 202 .

[0031] Exemplarily, the second low-pressure heater assembly includes a four-stage low-pressure heater 401, a five-stage low-pressure heater 402 and a six-stage low-pressure heater 403, the water inlet end of the four-stage low-pressure heater 401 is connected to the regulating valve assembly 300 through a pipeline, the four-stage low-pressure heater 401, the five-stage low-pressure heater 402 and the six-stage low-pressure heater 403 are connected in sequence through pipelines, and the water outlet end of the six-stage low-pressure heater 403 is connected to the deaerator 500 through a pipeline.

[0032] Exemplarily, a check valve 304 is provided on the water outlet of the regulating valve assembly 300. Thus, when the cooling water return water is over-pressured, the condensed water will not flow back, thus ensuring the smooth operation of the entire pipeline.

[0033] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "connected" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0034] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and substitutions can be made without departing from the technical principle of the present invention. These improvements and substitutions should also be regarded as the protection scope of the present invention.

Claims

1. A condensate regulating system for a power plant, characterized in that: The system comprises a condensate assembly, a first low-pressure heater assembly, a regulating valve assembly, a second low-pressure heater assembly and a deaerator which are sequentially arranged along the flow direction of the condensate; a first cooling water outlet is arranged on the pipeline between the first low-pressure heater assembly and the regulating valve assembly; a cooling water return port is arranged on the pipeline between the regulating valve assembly and the second low-pressure heater assembly; the regulating valve assembly is used to adjust the condensate flow in the system to adjust the water level of the deaerator; the regulating valve assembly comprises a first regulating branch, a second regulating branch and a third regulating branch which are arranged in parallel; a first electric gate valve, a first electric regulating valve and a second electric gate valve are arranged on the first regulating branch; a third electric gate valve, a second electric regulating valve and a fourth electric gate valve are arranged on the second regulating branch; and a fifth electric gate valve is arranged on the third regulating branch.

2. A condensate regulating system for a power plant according to claim 1, characterized in that: The condensate assembly comprises a condenser, a condensate pump, a shaft seal cooler and a drain cooler which are sequentially arranged along the flow direction of the condensate.

3. A condensate regulating system for a power plant according to claim 2, characterized in that: The condenser includes a first condenser and a second condenser, and the first condenser and the second condenser are arranged in parallel.

4. A condensate regulating system for a power plant according to claim 3, characterized in that: The first low-pressure heater includes a first-stage low-pressure heater, a second-stage low-pressure heater and a third-stage low-pressure heater, the first-stage low-pressure heater is arranged on the first condenser, the second-stage low-pressure heater is arranged on the second condenser, the third-stage low-pressure heater is arranged between the second-stage low-pressure heater and the regulating valve assembly, the water inlet end of the first-stage low-pressure heater is connected to the drain cooler through a pipeline, the first-stage low-pressure heater, the second-stage low-pressure heater and the third-stage low-pressure heater are connected in sequence through pipelines, the water outlet end of the third-stage low-pressure heater is connected to the regulating valve assembly through a pipeline, and the first cooling water outlet is arranged on the pipeline between the third-stage low-pressure heater and the regulating valve assembly.

5. A condensate regulating system for a power plant according to claim 4, characterized in that: A second cooling water outlet is provided on the pipeline between the first-level low-pressure heater and the second-level low-pressure heater.

6. A condensate regulating system for a power plant according to claim 1, characterized in that: The second low-pressure heater assembly includes a four-stage low-pressure heater, a five-stage low-pressure heater and a six-stage low-pressure heater. The water inlet end of the four-stage low-pressure heater is connected to the regulating valve assembly through a pipeline. The four-stage low-pressure heater, the five-stage low-pressure heater and the six-stage low-pressure heater are connected in sequence through pipelines. The water outlet end of the six-stage low-pressure heater is connected to the deaerator through a pipeline.

7. A condensate regulating system for a power plant according to claim 1, characterized in that: A check valve is provided on the water outlet end of the regulating valve assembly.

Images