Automatic control device for recirculation flow of feed pump
By designing an automatic control device for the water pump and utilizing a DCS system and valves to regulate flow, the problem of leakage in the high-pressure water pump was solved, achieving precise flow control and safe and efficient operation of the water pump.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-04-29
- Publication Date
- 2026-04-07
AI Technical Summary
The minimum flow control valves of existing high-pressure feedwater pumps in power plants have complex structures and high costs. After long-term use, they may not close tightly, leading to leakage and increased pump load, which increases resource waste and maintenance costs.
An automatic control device was designed, comprising a water pump, motor, pipeline, valve, flow meter, and DCS system. The DCS system analyzes data and controls valve opening to achieve precise regulation of water pump flow and reduce leakage.
It achieves precise control of the minimum flow rate of the water pump, reduces leakage, lowers the pump load and maintenance costs, extends the maintenance cycle, and improves safety performance.
Smart Images
Figure CN224093533U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model belongs to the technical field of water supply pump, and relates to an automatic control device for recirculation flow of a water supply pump. BACKGROUND
[0002] The water supply pump is used for supplying water to a boiler. The water supply pump delivers water with a certain temperature in a deaerator storage tank to the boiler as boiler water. The minimum flow control valve equipment of the existing high-pressure water supply pump of a power plant has a complex structure, is generally high in cost, and has the problems of loose closing during operation, high-pressure water leakage, increased water pump load and the like after long-time use. The above problems result in serious resource waste and increased maintenance and repair costs.
[0003] Therefore, the automatic control device for recirculation flow of a water supply pump is designed to overcome the above problems. CONTENT OF THE UTILITY MODEL
[0004] The utility model aims at overcoming the defects of the prior art and providing an automatic control device for recirculation flow of a water supply pump, which is simple and reasonable in structure, practical and convenient to use, safe, efficient and stable.
[0005] The utility model is realized through the following technical scheme: an automatic control device for recirculation flow of a water supply pump, which comprises a water supply pump and a motor connected with a water supply pump circuit. The water supply pump and the motor work through an external power supply. A water supply pump inlet and a water supply pump outlet are arranged on the water supply pump. The water supply pump inlet and the water supply pump outlet are connected with a first pipeline and a second pipeline respectively. A water supply pump inlet isolation valve and a water supply pump inlet filter screen are arranged on the first pipeline. A water supply pump outlet isolation valve, a water supply pump outlet flowmeter and a water supply pump outlet check valve are arranged on the second pipeline. A bypass is arranged on the second pipeline at the water supply pump outlet check valve. A recirculation adjusting valve and a recirculation flowmeter are arranged on the bypass. The bypass is connected with a water recirculation outlet pipeline away from the water supply pump. The water supply pump outlet flowmeter, the recirculation adjusting valve and the recirculation flowmeter are connected with a DCS system circuit. After the water supply pump outlet flowmeter, the recirculation adjusting valve and the recirculation flowmeter transmit collected data to the DCS system, the DCS system analyzes the data and controls the opening degree of the water supply pump outlet flowmeter, the recirculation adjusting valve and the recirculation flowmeter to regulate the flow of the water supply pump.
[0006] Preferably, a front pressure gauge and a rear pressure gauge are arranged on the first pipeline before and after the water supply pump inlet filter screen to monitor the pressure before and after the water supply pump inlet filter screen.
[0007] As preferred: a feed water pump outlet pressure gauge is arranged on the second pipeline between the feed water pump outlet flow meter and the feed water pump outlet check valve, for monitoring the pressure at the feed water pump outlet.
[0008] As preferred: a first recirculation isolation valve and a second recirculation isolation valve are arranged on the bypass before and after the recirculation regulating valve respectively, and the first recirculation isolation valve and the second recirculation isolation valve are arranged between the feed water pump outlet isolation valve, the recirculation regulating valve and the water pump outlet isolation valve, the recirculation flow meter respectively.
[0009] As preferred: a throttle orifice plate and a recirculation outlet pressure gauge are arranged on the bypass between the feed water pump outlet check valve and the first recirculation isolation valve.
[0010] The beneficial effects of the present utility model are as follows:
[0011] 1) The automatic control device for the recirculation flow of the feed water pump can precisely control the minimum flow valve of the water pump (close or reduce the opening of the flow meter through the DCS system and the valve), thereby reducing the leakage.
[0012] 2) The recirculation leakage flow can be removed to reduce the load of the feed water pump.
[0013] 3) The maintenance period can be prolonged, the maintenance cost can be reduced, and the safety performance can be improved. BRIEF DESCRIPTION OF DRAWINGS
[0014] Figure 1 It is a schematic diagram of the overall structure of the present utility model. DETAILED DESCRIPTION
[0015] In order to make those skilled in the art more clearly understand the purpose, technical scheme and advantages of the present utility model, the present utility model will be further described below in combination with the drawings and examples.
[0016] In the description of the present utility model, it should be understood that the orientation or position relationship indicated by the terms such as "up", "down", "left", "right", "inner", "outer", "horizontal", "vertical" is based on the orientation or position relationship shown in the drawings, and is only for the convenience of describing the present utility model, and does not indicate or imply that the device or element referred to must have a particular orientation, so it cannot be understood as a limitation on the present utility model.
[0017] The present utility model will be described in detail below in combination with the drawings: as Figure 1As shown, an automatic control device for feed water pump recirculation flow, comprising a feed water pump 1 and a motor 2 connected with the circuit of the feed water pump 1, the feed water pump 1 and the motor 2 are operated by an external power supply (not shown in the figure), the feed water pump 1 is provided with a feed water pump inlet 3 and a feed water pump outlet 4, respectively, the feed water pump inlet 3 and the feed water pump outlet 4 are connected with a first pipeline 5 and a second pipeline 6, respectively, the first pipeline 5 is provided with a feed water pump inlet isolation valve 7 and a feed water pump inlet filter screen 8, respectively, the second pipeline 6 is provided with a feed water pump outlet isolation valve 9, a feed water pump outlet flowmeter 10 and a feed water pump outlet check valve 11, respectively, the second pipeline 6 is provided with a bypass 12 at the feed water pump outlet check valve 11, the bypass 12 is provided with a recirculation regulating valve 18 and a recirculation flowmeter 13, respectively, the bypass 12 is connected with a feed water recirculation outlet pipeline away from the feed water pump, the feed water pump outlet flowmeter 10, the recirculation regulating valve 18 and the recirculation flowmeter 13 are connected with a DCS system 14, after the DCS system 14 receives the data collected by the feed water pump outlet flowmeter 10, the recirculation regulating valve 18 and the recirculation flowmeter 13, the DCS system 14 analyzes the data and controls the opening degree of the feed water pump outlet flowmeter 10, the recirculation regulating valve 18 and the recirculation flowmeter 13, and adjusts the flow of the feed water pump 1. The DCS system in the utility model is prior art, so it is not described in detail.
[0018] The front and rear of the feed water pump inlet filter screen 8 are provided with a feed water pump inlet filter screen front pressure gauge 15 and a feed water pump inlet filter screen rear pressure gauge 16 on the first pipeline 5, respectively, for monitoring the pressure at the front and rear positions of the feed water pump inlet filter screen 8. The feed water pump outlet flowmeter 10 and the feed water pump outlet check valve 11 are provided with a feed water pump outlet pressure gauge 17 on the second pipeline 6, for monitoring the pressure at the outlet of the feed water pump 1.
[0019] The front and rear of the recirculation regulating valve 18 are provided with a first recirculation isolation valve 19 and a second recirculation isolation valve 20 on the bypass 12, respectively, and the first recirculation isolation valve 19 and the second recirculation isolation valve 20 are arranged between the feed water pump outlet isolation valve 9, the recirculation regulating valve 18 and the feed water pump outlet isolation valve 9, the recirculation flowmeter 13, respectively. The bypass 12 is provided with a throttle orifice plate 21 and a recirculation outlet pressure gauge 22 between the feed water pump outlet check valve 11 and the first recirculation isolation valve 19.
[0020] The utility model discloses a set of automatic adjusting device (DCS system and adjusting valve, isolation valve and flowmeter) can be well according to the feed water pump outlet flow, recirculation flow accurate control, ensure that the minimum flow of the feed water pump is safe. The utility model can reduce the feed water leakage, improve the feed water pump efficiency, reduce the downtime maintenance time. Through the application of the utility model, the feed water leakage can be reduced by at least 10 / hour.
[0021] The specific embodiments described herein are merely illustrative of the principles of the present application and its efficacy, and are not intended to limit the present application. Any person skilled in the art can modify or change the above embodiments without departing from the spirit and scope of the present application. Therefore, all equivalent modifications or changes made by those skilled in the art without departing from the spirit and technical concept disclosed by the present application should be covered by the claims of the present application.
Claims
1. An automatic control device for the recirculation flow rate of a water pump, comprising a water pump (1) and a motor (2) connected to the circuit of the water pump (1), wherein the water pump (1) and the motor (2) operate via an external power supply, characterized in that: The water pump (1) is provided with a water pump inlet (3) and a water pump outlet (4). The water pump inlet (3) and the water pump outlet (4) are respectively connected to the first pipeline (5) and the second pipeline (6). The first pipeline (5) is provided with a water pump inlet isolation valve (7) and a water pump inlet filter (8). The second pipeline (6) is provided with a water pump outlet isolation valve (9), a water pump outlet flow meter (10) and a water pump outlet check valve (11). A bypass (12) is provided on the second pipeline (6) at the water pump outlet check valve (11). A recirculation regulating valve is provided on the bypass (12). (18) and recirculation flow meter (13), the bypass (12) is connected to the recirculation outlet pipeline of the water supply pump at the end away from the water supply pump. The water supply pump outlet flow meter (10), recirculation regulating valve (18) and recirculation flow meter (13) are all connected to the DCS system (14). After the water supply pump outlet flow meter (10), recirculation regulating valve (18) and recirculation flow meter (13) transmit the collected data to the DCS system (14), the DCS system (14) analyzes the data and controls the opening of the water supply pump outlet flow meter (10), recirculation regulating valve (18) and recirculation flow meter (13) to regulate the flow of the water supply pump (1).
2. The automatic control device for the recirculation flow rate of the water pump according to claim 1, characterized in that: The inlet filter screen (8) of the water pump is equipped with a pressure gauge (15) in front of the inlet filter screen and a pressure gauge (16) in rear of the inlet filter screen on the first pipeline (5) respectively, for monitoring the pressure at the positions in front of and behind the inlet filter screen (8).
3. The automatic control device for the recirculation flow rate of the water pump according to claim 1 or 2, characterized in that: A pressure gauge (17) for the outlet of the water pump is installed on the second pipeline (6) between the water pump outlet flow meter (10) and the water pump outlet check valve (11) to monitor the pressure at the outlet of the water pump (1).
4. The automatic control device for the recirculation flow rate of the water pump according to claim 3, characterized in that: The recirculation regulating valve (18) is provided with a first recirculation isolation valve (19) and a second recirculation isolation valve (20) on the bypass (12) before and after it, and the first recirculation isolation valve (19) and the second recirculation isolation valve (20) are respectively located between the water pump outlet isolation valve (9), the recirculation regulating valve (18), the water pump outlet isolation valve (9), and the recirculation flow meter (13).
5. The automatic control device for the recirculation flow rate of the water pump according to claim 4, characterized in that: A throttling orifice plate (21) and a recirculation outlet pressure gauge (22) are provided on the bypass (12) between the feed pump outlet check valve (11) and the first recirculation isolation valve (19).