Comprehensive utilization system for continuous drainage of power plant

Abstract

The utility model provides a comprehensive utilization system for continuous discharge water of a power plant, which relates to the technical field of boiler continuous discharge water recovery and comprises a steam pocket, a continuous discharge flash tank is arranged at one end of the steam pocket, a deaerator is arranged at one end of the continuous discharge flash tank, and a water pump is arranged at one end, far away from the deaerator, of the continuous discharge flash tank. An electric stop valve is arranged at one end of the water pump, and a second stop valve is arranged at the end, away from the water pump, of the electric stop valve. According to the utility model, the continuous discharge flash tank is used for carrying out capacity expansion on the continuous discharge water of the boiler to recover flash steam, meanwhile, the expanded continuous discharge water is combined with external supply steam, so that the continuous discharge water is output as the external supply steam, the recovery control system is used for controlling the quality of the supply steam, and energy and water resources in the continuous discharge water are recovered; the key parts of the recovery system are reasonably selected and designed, continuous and stable operation of the recovery system is ensured, and meanwhile, the system is provided with a plurality of bypasses, so that operators can conveniently overhaul and maintain at any time.

Description

Technical Field

[0001] This utility model relates to the field of boiler wastewater recycling technology, and in particular to a comprehensive utilization system for power plant wastewater. Background Technology

[0002] In the power industry, boiler drum wastewater is typically expanded and flash-evaporated in a continuous discharge expansion tank. The saturated steam after flash evaporation is then utilized in a deaerator or steam network, while the saturated water is directly discharged into a stationary discharge expansion tank, resulting in significant waste heat and water resource losses. Traditional methods for treating continuous discharge wastewater fail to fully and effectively utilize the energy and water resources in the discharged boiler water, increasing energy losses and fuel consumption at the power plant. Furthermore, the direct discharge of boiler water after expansion causes thermal pollution and substantial water waste. Therefore, we propose a comprehensive utilization system for continuous discharge wastewater 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 power plant wastewater.

[0004] To achieve the above objectives, this utility model adopts the following technical solution: a power plant continuous discharge and drainage integrated utilization system, comprising: a steam drum, a continuous discharge expansion vessel at one end of the steam drum, a deaerator at one end of the continuous discharge expansion vessel, a water pump at the end of the continuous discharge expansion vessel away from the deaerator, an electric shut-off valve at one end of the water pump, a second shut-off valve at the end of the electric shut-off valve away from the water pump, a regulating valve between the two second shut-off valves, a throttling valve between the two second shut-off valves of the regulating branch bypass, a boiler water pipeline connected to the ends of the two second shut-off valves away from the electric shut-off valve, a first shut-off valve at one end of the boiler water pipeline, a check valve at one end of the first shut-off valve, an atomizing nozzle at the end of the check valve away from the first shut-off valve, a back pressure turbine exhaust steam pipeline on one side of the atomizing nozzle, a pressure gauge at the end of the atomizing nozzle away from the back pressure turbine exhaust steam pipeline, a temperature gauge at the end of the pressure gauge away from the atomizing nozzle, and a steam header connected to one end of the temperature gauge.

[0005] In a preferred embodiment, the outlet of the steam drum is connected to the continuous blowdown expansion vessel; the upper end of the continuous blowdown expansion vessel is connected to the deaerator; and the lower end of the continuous blowdown expansion vessel is connected to the boiler water pipeline.

[0006] In a preferred embodiment, the boiler water pipeline is connected to one end of the atomizing nozzle; the other end of the atomizing nozzle is connected to the exhaust steam pipeline of the back pressure unit; and the exhaust steam pipeline of the back pressure unit is connected to the steam collection header.

[0007] In one preferred embodiment, the boiler water pipeline is equipped with a water pump and various valves; the continuous expansion tank is connected to one end of the water pump; and the other end of the water pump is connected to an electric shut-off valve.

[0008] In a preferred embodiment, the electric shut-off valve is connected to the regulating valve pipeline; the regulating valve pipeline is connected to the first shut-off valve; and the first shut-off valve is connected to the check valve.

[0009] In a preferred embodiment, the check valve is connected to the atomizing nozzle; a pressure gauge and a temperature gauge are installed at the inlet end of the steam manifold.

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

[0011] 1. This utility model utilizes a continuous flow expansion vessel to expand the capacity of boiler continuous flow water and recover flash steam. At the same time, it combines the expanded continuous flow water with external steam supply, realizing the continuous flow water as an output for external steam supply. The quality of the steam supply is controlled by a recovery control system, and the energy and water resources in the continuous flow water are recovered. The key components of the recovery system are reasonably selected and designed to ensure the continuous and stable operation of the recovery system. At the same time, the system is equipped with multiple bypasses to facilitate operators to perform inspection and maintenance at any time.

[0012] 2. The recovery control system of this utility model monitors the parameters of the external steam supply and adjusts the amount of wastewater used in the external steam supply in a timely manner to ensure the quality of the external steam supply is up to standard. Attached Figure Description

[0013] Figure 1 This utility model provides a structural schematic diagram of a power plant wastewater integrated utilization system.

[0014] Legend:

[0015] 1. Steam drum; 2. Continuous blowdown expansion tank; 3. Deaerator; 4. Boiler water pipeline; 5. Atomizing nozzle; 6. Back pressure turbine exhaust steam pipeline; 7. Steam header; 8. Water pump; 9. Electric shut-off valve; 10. Pressure gauge; 11. Thermometer; 12. First shut-off valve; 13. Check valve; 14. Regulating valve; 15. Second shut-off valve; 16. Throttling valve. Detailed Implementation

[0016] To more clearly illustrate the overall concept of this utility model, a detailed description will be provided below with reference to the accompanying drawings.

[0017] 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.

[0018] 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.

[0019] 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.

[0020] 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

[0021] like Figure 1As shown, this utility model provides a technical solution: a power plant continuous discharge drainage integrated utilization system, comprising: a steam drum 1, a continuous discharge expansion tank 2 at one end of the steam drum 1, a deaerator 3 at one end of the continuous discharge expansion tank 2, a water pump 8 at the end of the continuous discharge expansion tank 2 away from the deaerator 3, an electric shut-off valve 9 at one end of the water pump 8, a second shut-off valve 15 at the end of the electric shut-off valve 9 away from the water pump 8, a regulating valve 14 between the two second shut-off valves 15, and a throttling valve 16 between the two second shut-off valves 15 regulating the branch bypass. Two second shut-off valves 15 are connected to a boiler water pipeline 4 at the ends away from the electric shut-off valve 9. A first shut-off valve 12 is installed at one end of the boiler water pipeline 4. A check valve 13 is installed at one end of the first shut-off valve 12. An atomizing nozzle 5 is installed at the end of the check valve 13 away from the first shut-off valve 12. A back pressure turbine exhaust steam pipeline 6 is installed on one side of the atomizing nozzle 5. A pressure gauge 10 is installed at the end of the atomizing nozzle 5 away from the back pressure turbine exhaust steam pipeline 6. A temperature gauge 11 is installed at the end of the pressure gauge 10 away from the atomizing nozzle 5. A steam manifold 7 is connected to one end of the temperature gauge 11.

[0022] The outlet of steam drum 1 is connected to continuous blowdown expansion tank 2; the upper end of continuous blowdown expansion tank 2 is connected to deaerator 3; the lower end of continuous blowdown expansion tank 2 is connected to boiler water pipeline 4, and boiler water pipeline 4 is connected to one end of atomizing nozzle 5; the other end of atomizing nozzle 5 is connected to back compressor exhaust steam pipeline 6; back compressor exhaust steam pipeline 6 is connected to steam collector header 7; boiler water pipeline 4 is equipped with water pump 8 and various valves; continuous blowdown expansion tank 2 is connected to one end of water pump 8; the other end of water pump 8 is connected to electric shut-off valve 9, electric shut-off valve 9 is connected to regulating valve 14 pipeline; regulating valve 14 pipeline is connected to first shut-off valve 12; first shut-off valve 12 is connected to check valve 13, check valve 13 is connected to atomizing nozzle 5; pressure gauge 10 and temperature gauge 11 are installed at the inlet end of steam collector header 7.

[0023] The recycling control system includes on-site measurement point layout, information acquisition, and automatic control algorithms to achieve automated operation of continuous drainage utilization.

[0024] In this embodiment, the system starts from the steam drum 1, flashes the steam drum drain in the expansion tank 2, and then passes the saturated steam into the deaerator 3 for thermal deaeration. The saturated water is then pressurized by a water pump and enters the boiler water pipeline 4, where it is sprayed through atomizing nozzles 5 into the external steam supply pipeline for heat exchange. The atomizing nozzles 5 are connected to the back pressure turbine exhaust steam pipeline 6. Finally, the steam, cooled to the rated temperature, is collected in the steam header 7. The system is also equipped with a water pump 8, an electric shut-off valve 9, a regulating valve 14, and a manual throttle valve 16 to ensure precise regulation of water flow and pressure. The operating status of key components is displayed locally via pressure gauges 10 and thermometers 11. The recovery control system utilizes automated control algorithms to optimize water resource usage, ensuring stable and reliable system operation and improving energy efficiency.

[0025] Working principle:

[0026] like Figure 1 As shown, the system starts circulating through steam drum 1. The water from steam drum 1 flows into continuous expansion tank 2 through a pipeline. After expansion by continuous expansion tank 2, the high-temperature and high-pressure saturated water undergoes flash evaporation under the expansion pressure. The saturated steam is passed into deaerator 3 for thermal deoxygenation. The saturated water is discharged through the bottom of continuous expansion tank 2 and pressurized by water pump 8.

[0027] Next, the regulated saturated water enters the atomizing nozzle 5 through the boiler water pipeline 4. At the nozzle, the water is atomized and sent to the external steam supply pipeline for heat exchange. Simultaneously, the atomizing nozzle 5 connects to the back-compressor exhaust steam pipeline 6, recovering the desuperheated steam at its rated temperature through the steam collector header 7. The system is also equipped with a water pump 8 and a series of valves such as an electric shut-off valve 9, a regulating valve 14, and a manual throttle valve 16 for precise control of water flow and pressure. The water pump 8 ensures a continuous water flow, the electric shut-off valve 9 controls the opening and closing of the flow rate, and the regulating valve 14 and throttle valve 16 adjust the water flow rate and pressure as needed to ensure the efficient operation of the desuperheating system.

[0028] Finally, the system's water recovery control system monitors the temperature changes of the externally supplied steam in real time through multiple temperature measuring points set up on the external steam supply pipeline. This data is fed back to the system via automated control algorithms, helping to regulate and optimize water resource use. Through precise water flow regulation and real-time monitoring, the system can continuously ensure the efficient utilization of wastewater, reduce energy waste, and improve system stability and reliability, ultimately achieving the beneficial effects of energy conservation and environmental protection.

[0029] 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.

[0030] 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 comprehensive utilization system for wastewater from a power plant, characterized in that, include: A steam drum (1) is provided with a continuous expansion vessel (2) at one end of the steam drum (1), a deaerator (3) is provided at one end of the continuous expansion vessel (2), a water pump (8) is provided at the end of the continuous expansion vessel (2) away from the deaerator (3), an electric shut-off valve (9) is provided at one end of the water pump (8), a second shut-off valve (15) is provided at the end of the electric shut-off valve (9) away from the water pump (8), a regulating valve (14) is provided between the two second shut-off valves (15), a throttle valve (16) is provided between the two second shut-off valves (15) of the regulating branch bypass, and the two second shut-off valves (15) are located away from the electric shut-off valve (14). One end of 9) is connected to a boiler water pipeline (4), and a first shut-off valve (12) is provided at one end of the boiler water pipeline (4). A check valve (13) is provided at one end of the first shut-off valve (12). An atomizing nozzle (5) is provided at the end of the check valve (13) away from the first shut-off valve (12). A back pressure turbine exhaust steam pipeline (6) is provided on one side of the atomizing nozzle (5). A pressure gauge (10) is provided at the end of the atomizing nozzle (5) away from the back pressure turbine exhaust steam pipeline (6). A temperature gauge (11) is provided at the end of the pressure gauge (10) away from the atomizing nozzle (5). A steam header (7) is connected to one end of the temperature gauge (11).

2. The integrated utilization system for power plant wastewater according to claim 1, characterized in that: The outlet of the steam drum (1) is connected to the continuous blowdown expansion vessel (2); the upper end of the continuous blowdown expansion vessel (2) is connected to the deaerator (3); and the lower end of the continuous blowdown expansion vessel (2) is connected to the boiler water pipeline (4).

3. The integrated utilization system for power plant wastewater according to claim 1, characterized in that: The boiler water pipeline (4) is connected to one end of the atomizing nozzle (5); the other end of the atomizing nozzle (5) is connected to the exhaust steam pipeline (6) of the back pressure unit; the exhaust steam pipeline (6) of the back pressure unit is connected to the steam collection manifold (7).

4. A power plant wastewater integrated utilization system according to claim 1, characterized in that: The boiler water pipeline (4) is equipped with a water pump (8) and various valves; the continuous expansion container (2) is connected to one end of the water pump (8); the other end of the water pump (8) is connected to the electric shut-off valve (9).

5. A comprehensive utilization system for wastewater from a power plant according to claim 1, characterized in that: The electric shut-off valve (9) is connected to the regulating valve (14) via pipeline; the regulating valve (14) via pipeline is connected to the first shut-off valve (12); the first shut-off valve (12) is connected to the check valve (13).

6. A comprehensive utilization system for wastewater from a power plant according to claim 1, characterized in that: The check valve (13) is connected to the atomizing nozzle (5); the inlet end of the steam manifold (7) is equipped with a pressure gauge (10) and a temperature gauge (11).

Images