Comprehensive utilization system for low-quality boiler water of power plant

Abstract

The utility model provides a comprehensive utilization system for low-quality boiler water of a power plant, which relates to the technical field of boiler constant and continuous drainage water recovery and comprises a boiler water main pipe, a first stop valve is arranged at one end of the boiler water main pipe, and a check valve is arranged at one end, far away from the boiler water main pipe, of the first stop valve. According to the utility model, the low-quality definite and continuous drainage of the boiler and the external steam supply are combined, the definite and continuous drainage is used as the output of the external steam supply, the steam supply quality is controlled by utilizing the recovery control system, the energy and water resources in the definite and continuous drainage are recovered, and the key parts of the recovery system are reasonably selected and designed. The continuous and stable operation of the recovery system is guaranteed, a plurality of bypasses are arranged, an operator can conveniently conduct overhaul and maintenance at any time, the recovery control system monitors external steam supply parameters in real time, the opening degree of an electric control valve of the boiler water main pipe is adjusted and controlled in time, the external steam supply quality is guaranteed, and the labor cost is also saved.

Description

Technical Field

[0001] This utility model relates to the field of boiler continuous and continuous drainage recycling technology, and in particular to a comprehensive utilization system for low-quality boiler water in power plants. Background Technology

[0002] The traditional method for treating low-quality boiler water from power plants typically involves discharging the wastewater into a continuous discharge expansion tank. After depressurization and flash evaporation, the wastewater is converted into saturated steam and saturated water at the appropriate flash parameters. The saturated steam can be used as a steam source for the deaerator or the plant area, while the saturated water is discharged to the continuous discharge expansion tank via pipeline. After depressurization and discharge to the continuous discharge expansion tank, the generated steam is directly released into the atmosphere, while the saturated water at the corresponding parameters is discharged directly through a drainage ditch along with the continuous discharge saturated water. Traditional methods for treating continuous boiler water fail to fully and effectively utilize the energy and water resources in the discharged low-quality boiler water, increasing energy losses and fuel consumption at the power plant. Furthermore, the direct discharge of boiler water and wastewater causes thermal pollution and significant waste of water resources. Therefore, we provide a comprehensive utilization system for low-quality boiler water from power plants. Utility Model Content

[0003] The purpose of this invention is to overcome the shortcomings of existing technologies and provide a comprehensive utilization system for low-quality boiler water in power plants.

[0004] To achieve the above objectives, this utility model adopts the following technical solution: a comprehensive utilization system for low-quality boiler water in a power plant, comprising: a boiler water header, a first shut-off valve at one end of the boiler water header, a check valve at the end of the first shut-off valve away from the boiler water header, a first atomizing nozzle at the end of the check valve away from the first shut-off valve, a pressure gauge at one side of the first atomizing nozzle, a thermometer at the end of the pressure gauge away from the first atomizing nozzle, a gas collection manifold at the end of the thermometer away from the pressure gauge, a steam extraction pipe at the side of the first atomizing nozzle away from the pressure gauge, a pressure matching device at the end of the steam extraction pipe away from the first atomizing nozzle, a second atomizing nozzle at the end of the pressure matching device near the steam extraction pipe, a second shut-off valve at the side of the boiler water header away from the first shut-off valve, an electric regulating valve at the end of the second shut-off valve away from the boiler water header, a manual throttling valve at a branch other than the second shut-off valve and the electric regulating valve, and a filter between the two second shut-off valves at the ends of the electric regulating valve and the manual throttling valve away from the boiler water header.

[0005] In a preferred embodiment, the boiler water header is connected to the fixed and continuous drainage pipes; the pressure matcher is mounted on the extraction steam pipe and connected to the exhaust steam of the back pressure unit; the first atomizing nozzle is mounted inside the external steam supply pipe after the pressure matcher and connected to the boiler water header.

[0006] In a preferred embodiment, the extraction steam pipe is equipped with a water spray desuperheater and connected to the feedwater header; the desuperheating water cools the steam in the extraction steam pipe to 400°C; the pressure matching device increases the exhaust steam pressure of the back compressor to the rated pressure for external steam supply.

[0007] In a preferred embodiment, a pressure gauge and a temperature gauge are installed at the inlet end of the gas collecting manifold; the pressure gauge and temperature gauge can display relevant parameters of the external steam supply locally; a first atomizing nozzle is configured on the extraction steam pipeline after the gas collecting manifold and the pressure matching device; the first atomizing nozzle is connected to the boiler water header.

[0008] In a preferred embodiment, a first shut-off valve and a check valve are provided at the end of the boiler water header near the first atomizing nozzle; a regulating valve line, an electric shut-off valve, and a filter line are sequentially arranged on the line from the first shut-off valve to the boiler water header; the regulating valve line includes an electric regulating valve, second shut-off valves on both sides of the electric regulating valve, and a regulating valve bypass.

[0009] In a preferred embodiment, the filter, the second shut-off valves on both sides of the filter, and the filter bypass all belong to the filter pipeline; manual throttle valves are installed on branches other than the second shut-off valve and the electric regulating valve; the filter and the second shut-off valves on both sides of the filter are installed on the filter bypass.

[0010] Compared with the prior art, the advantages and positive effects of this utility model are as follows:

[0011] This invention combines low-quality continuous and alternating drainage from a boiler with external steam supply, enabling continuous and alternating drainage to be used as the output for external steam supply. A recovery control system is used to control the quality of the steam supply, recovering energy and water resources from the continuous and alternating drainage. Key components of the recovery system are rationally selected and designed to ensure continuous and stable operation. Multiple bypasses are provided for easy inspection and maintenance by operators. The recovery control system monitors external steam supply parameters in real time and adjusts the opening of the electric regulating valve on the boiler water header in a timely manner, ensuring the quality of the external steam supply and saving labor costs. Attached Figure Description

[0012] Figure 1 This utility model provides a structural schematic diagram of a comprehensive utilization system for low-quality boiler water in power plants.

[0013] Legend:

[0014] 1. Boiler water header; 2. Pressure matching device; 3. Steam extraction pipe; 4. First atomizing nozzle; 5. Second atomizing nozzle; 6. Pressure gauge; 7. Temperature gauge; 8. Gas collection manifold; 9. First shut-off valve; 10. Second shut-off valve; 11. Check valve; 12. Electric regulating valve; 13. Filter; 14. Manual throttle valve; Filter. Detailed Implementation

[0015] To more clearly illustrate the overall concept of this utility model, a detailed description will be provided below with reference to the accompanying drawings and examples.

[0016] It should be noted that many specific details are set forth in the following description in order to provide a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Therefore, the scope of protection of the present invention is not limited to the specific embodiments disclosed below.

[0017] Furthermore, it should be understood in the description of this utility model that the terms "center," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0018] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral unit; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. However, specifying a direct connection indicates that the two main bodies at the connection point are not connected by an intermediate structure, but are simply connected to form a whole through a connecting structure. For those skilled in the art, the specific meaning of the above terms in this utility model can be understood according to the specific circumstances.

[0019] In this utility model, unless otherwise expressly specified and limited, the first feature "on" or "below" the second feature may be in direct contact with the first and second features, or indirect contact through an intermediate medium. In the description of this specification, references to terms such as "an embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this utility model. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Example

[0020] like Figure 1 As shown, this utility model provides a technical solution: a comprehensive utilization system for low-quality boiler water in a power plant, comprising: a boiler water header 1, a first shut-off valve 9 at one end of the boiler water header 1, a check valve 11 at the end of the first shut-off valve 9 away from the boiler water header 1, a first atomizing nozzle 4 at the end of the check valve 11 away from the first shut-off valve 9, a pressure gauge 6 on one side of the first atomizing nozzle 4, a temperature gauge 7 at the end of the pressure gauge 6 away from the first atomizing nozzle 4, a gas collecting manifold 8 at the end of the temperature gauge 7 away from the pressure gauge 6, and a gas collecting manifold 8 at the end of the first atomizing nozzle 4 away from the pressure gauge 6. A steam extraction pipe 3 is provided. A pressure matching device 2 is provided at the end of the steam extraction pipe 3 away from the first atomizing nozzle 4. A second atomizing nozzle 5 is provided at the end of the pressure matching device 2 close to the steam extraction pipe 3. A second shut-off valve 10 is provided on the side of the boiler water main pipe 1 away from the first shut-off valve 9. An electric regulating valve 12 is provided at the end of the second shut-off valve 10 away from the boiler water main pipe 1. A manual throttle valve 14 is provided on the branch other than the second shut-off valve 10 and the electric regulating valve 12. A filter 13 is provided between the two second shut-off valves 10 at the end of the electric regulating valve 12 and the manual throttle valve 14 away from the boiler water main pipe 1.

[0021] Boiler water header 1 is connected to the fixed and continuous drainage pipes; pressure matching device 2 is installed on extraction steam pipe 3 and connected to the exhaust steam of the back compressor; the first atomizing nozzle 4 is installed inside the external steam supply pipe after pressure matching device 2 and connected to boiler water header 1; a water spray desuperheater is installed inside extraction steam pipe 3 and connected to feedwater header; the desuperheating water cools the steam in extraction steam pipe 3 to 400℃; pressure matching device 2 increases the back compressor exhaust steam pressure to the rated external steam supply pressure; pressure gauge 6 and temperature gauge 7 are installed at the inlet end of gas collecting manifold 8; pressure gauge 6 and temperature gauge 7 can display relevant parameters of external steam supply locally; gas collecting manifold 8 and pressure matching device 2... A first atomizing nozzle 4 is installed on the subsequent extraction steam pipe; the first atomizing nozzle 4 is connected to the boiler water main pipe 1, and a first shut-off valve 9 and a check valve 11 are installed at the end of the boiler water main pipe 1 near the first atomizing nozzle 4; a regulating valve line, an electric shut-off valve and a filter 13 line are sequentially installed on the line from the first shut-off valve 9 to the boiler water main pipe 1; the filter 13, the second shut-off valves 10 on both sides of the filter 13 and the filter 13 bypass all belong to the filter line; a manual throttle valve 14 is installed on the branch other than the second shut-off valve 10 and the electric regulating valve 12; the filter 13 and the second shut-off valves 10 on both sides of the filter 13 are installed on the filter 13 bypass;

[0022] The recovery control system includes on-site measurement point layout, information acquisition, and automatic control algorithms to realize the automated operation of comprehensive utilization of low-quality boiler water. The recovery control system adjusts the opening of the boiler water header regulating valve through temperature measurement points arranged on the external steam supply pipeline to achieve automatic control of the external steam supply temperature.

[0023] In this embodiment, the system utilizes the recovery of low-quality boiler water to improve energy efficiency and reduce water waste. The system includes a boiler water header 1, multiple first shut-off valves 9, a check valve 11, a filter 13, an electric regulating valve 12, a first atomizing nozzle 4, and a second atomizing nozzle 5. Low-quality boiler water enters the system through the boiler water header 1 and is then sprayed into the external steam supply pipeline through the first atomizing nozzle 4 to cool the exhaust steam from the back pressure turbine, thereby ensuring that the temperature of the externally supplied steam meets predetermined requirements. During this process, the turbine exhaust steam undergoes gradual temperature regulation through two stages of water spray desuperheating equipment before and after the pressure matching device 2, ensuring stable steam supply parameters that meet standards. The system is also equipped with pressure gauges 6 and thermometers 7 for local display of system operating status. The boiler water header 1 is equipped with regulating valve lines, including an electric regulating valve 12 and a manual throttle valve 14, as well as a bypass device, ensuring that system operation is not affected during maintenance. Simultaneously, the filter 13 and its bypass ensure water cleanliness, preventing impurities in the water from affecting the opening of the electric regulating valve. The recovery control system uses temperature measuring points arranged on the external steam extraction pipeline 3 to provide real-time data feedback and automatically adjust the opening of the electric regulating valve 12 on the boiler water header 1, thereby automatically controlling the steam supply temperature and ensuring the efficient, stable and reliable operation of the system.

[0024] Working principle:

[0025] like Figure 1 As shown, the low-quality boiler water comprehensive utilization system of this power plant improves energy efficiency and reduces water waste by recovering low-quality boiler water from the boiler's stator and continuous blowdown systems. The core components of the system include the boiler water header 1, the first atomizing nozzle 4, the second atomizing nozzle 5, the pressure matching device 2, the electric regulating valve 12, and the filter 13. In actual operation, low-quality boiler water enters the system through the boiler water header 1 and is sprayed into the extraction steam pipeline 3 (external steam supply pipeline) through the first atomizing nozzle 4 to reduce the exhaust steam temperature of the back pressure turbine and ensure stable steam supply temperature. The exhaust steam temperature is regulated by the spray desuperheater, and the pressure is increased by the pressure matching device 2 to meet external steam supply requirements. The system is equipped with pressure gauges 6 and 7 to display the operating status locally. Meanwhile, the electric regulating valve 12 and bypass device ensure uninterrupted operation during maintenance, and the filter 13 ensures water cleanliness and prevents impurities in the water from affecting the opening of the electric regulating valve. By recycling low-quality boiler water, the system reduces the demand for cooling water, improves energy efficiency, and reduces water waste. Through precise temperature and pressure control, the system's stability and reliability are improved, achieving the beneficial effects of energy saving, efficiency improvement, and environmental protection.

[0026] Those skilled in the art should understand that the discussion of any of the above embodiments is merely exemplary and is not intended to imply that the scope of the present invention (including the claims) is limited to these examples; within the framework of the present invention, the technical features of the above embodiments or different embodiments can also be combined, the steps can be implemented in any order, and there are many other variations of different aspects of the present invention as described above, which are not provided in the details for the sake of brevity.

[0027] This utility model is intended to cover all such substitutions, modifications, and variations that fall within the broad scope of the appended claims. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A power plant low-quality boiler water comprehensive utilization system, characterized in that, The application relates to a boiler water main pipe (1), one end of the boiler water main pipe (1) is provided with a first stop valve (9), the first stop valve (9) is provided with a check valve (11) away from one end of the boiler water main pipe (1), one end of the check valve (11) is provided with a first atomizing nozzle (4) away from the first stop valve (9), one side of the first atomizing nozzle (4) is provided with a pressure gauge (6), one end of the pressure gauge (6) is provided with a temperature gauge (7) away from the first atomizing nozzle (4), one end of the temperature gauge (7) is provided with a gas collecting header (8) away from the pressure gauge (6), one side of the first atomizing nozzle (4) is provided with a steam extraction pipeline (3) away from the pressure gauge (6), one end of the steam extraction pipeline (3) is provided with a pressure adapter (2) away from the first atomizing nozzle (4), one end of the pressure adapter (2) is provided with a second atomizing nozzle (5) close to the steam extraction pipeline (3), one side of the boiler water main pipe (1) is provided with a second stop valve (10) away from the first stop valve (9), one end of the second stop valve (10) is provided with an electric regulating valve (12) away from the boiler water main pipe (1), a branch outside the second stop valve (10) and the electric regulating valve (12) is provided with a manual throttle valve (14), one end of the electric regulating valve (12) and the manual throttle valve (14) away from the boiler water main pipe (1) is provided with a filter (13) between the two second stop valves (10). The boiler water main pipe (1) is connected with a fixed and continuous drainage pipeline; the pressure adapter (2) is assembled on the steam extraction pipeline (3) and connected with the exhaust steam of a back pressure machine; the first atomizing nozzle (4) is assembled in the external steam supply pipeline behind the pressure adapter (2) and connected with the boiler water main pipe (1).

2. The system for comprehensive utilization of low-quality boiler water in a power plant according to claim 1, characterized in that: The steam extraction pipeline (3) is internally provided with a water injection desuperheater and connected with a feed water main pipe; the desuperheater reduces the steam temperature of the steam extraction pipeline (3) to 400 DEG C; the pressure adapter (2) increases the exhaust steam pressure of the back pressure machine to the rated steam supply pressure.

3. The system for comprehensive utilization of low-quality boiler water in a power plant according to claim 1, characterized in that: The gas collecting header (8) is internally provided with the pressure gauge (6) and the temperature gauge (7); the pressure gauge (6) and the temperature gauge (7) can display the related parameters of the external steam supply; the first atomizing nozzle (4) is arranged on the steam extraction pipeline behind the gas collecting header (8) and the pressure adapter (2); and the first atomizing nozzle (4) is connected with the boiler water main pipe (1).

4. The system for comprehensive utilization of low-quality boiler water in a power plant according to claim 1, characterized in that: The first stop valve (9) and the check valve (11) are arranged on one end of the boiler water main pipe (1) close to the first atomizing nozzle (4); the first stop valve (9) is sequentially provided with an adjusting valve pipeline, an electric stop valve and a filter (13) pipeline in the flow direction of the boiler water main pipe (1); the adjusting valve pipeline comprises the electric regulating valve (12), the second stop valve (10) on both sides of the electric regulating valve (12) and an adjusting valve bypass.

5. The system for comprehensive utilization of low-quality boiler water in a power plant according to claim 1, characterized in that: ​ 6. The system for comprehensive utilization of low-quality boiler water in a power plant according to claim 1, characterized in that: The filter (13), the second stop valve (10) on both sides of the filter (13) and the filter (13) bypass all belong to the filter pipeline; the branch valve outside the second stop valve (10) and the electric regulating valve (12) is provided with a manual throttle valve (14); the filter (13) and the second stop valve (10) on both sides of the filter (13) are installed in the filter (13) bypass.

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