阅读说明：本技术 一种用于防止循环泵汽蚀的饱和水回路系统 (Saturated water loop system for preventing cavitation of circulating pump ) 是由 顾汉洋 刘莉 刘帅 于 2019-10-24 设计创作，主要内容包括：本发明公开了一种用于防止循环泵汽蚀的饱和水回路系统,由控制系统接收第一流量计、入口压力传感器和入口温度传感器的数据,计算得到注水系统需要注入的冷水量,并控制注水系统的流量电动调节阀的开度,以确保循环泵输入端处的高温高压水的过冷度达到预设数值。由控制系统接收出口压力传感器、出口温度传感器、出口流量计的数据,计算得到将循环泵输出端的过冷的高温高压水加热到饱和水状态需要的热功率,控制电加热器的功率,以确保排水管路输出端处的高温高压水达到饱和水状态,满足系统工艺要求。整个流程中通过各个传感器、流量电动调节阀和电加热器的配合,有效避免了循环泵的汽蚀现象,解决了现有防汽蚀装置复杂、成本高的问题。(The invention discloses a saturated water loop system for preventing a circulating pump from cavitation, which is characterized in that a control system receives data of a first flowmeter, an inlet pressure sensor and an inlet temperature sensor, calculates the amount of cold water to be injected into a water injection system, and controls the opening of a flow electric regulating valve of the water injection system so as to ensure that the supercooling degree of high-temperature and high-pressure water at the input end of the circulating pump reaches a preset value. The control system receives data of the outlet pressure sensor, the outlet temperature sensor and the outlet flowmeter, calculates to obtain thermal power required for heating the super-cooled high-temperature high-pressure water at the output end of the circulating pump to a saturated water state, and controls the power of the electric heater to ensure that the high-temperature high-pressure water at the output end of the drainage pipeline reaches the saturated water state, so that the technological requirements of the system are met. Through the cooperation of each sensor, flow electric control valve and electric heater in the whole flow, effectively avoided the cavitation phenomenon of circulating pump, solved current anti-cavitation device complicacy, problem with high costs.)

1. A saturated water loop system for preventing cavitation of a circulating pump is characterized by comprising a water injection system, a saturated water loop system and a control system;

the saturated water loop system comprises a water return pipeline, a converging pipeline, a water discharge pipeline, a circulating pump, a first flowmeter, an inlet pressure sensor, an inlet temperature sensor, an outlet pressure sensor, an outlet temperature sensor, an outlet flowmeter and an electric heater, wherein the first flowmeter is arranged on the water return pipeline;

the input end of the water return pipeline is communicated with an external system, the output end of the water return pipeline is communicated with the input end of the converging pipeline, the output end of the converging pipeline is communicated with the input end of the circulating pump, the output end of the circulating pump is communicated with the input end of the drainage pipeline, and the output end of the drainage pipeline is communicated with the external system; the outlet pressure sensor, the outlet temperature sensor and the outlet flowmeter are all arranged between the input end of the drainage pipeline and the electric heater;

the water injection system comprises a water injection pipeline, a water supplementing water tank, a plunger pump and an electric flow regulating valve, wherein the plunger pump and the electric flow regulating valve are arranged on the water injection pipeline; the input end of the water injection pipeline is communicated with the output end of the water replenishing water tank, and the output end of the water injection pipeline is communicated with the input end of the round pipeline; the plunger pump is arranged between the output end of the water injection pipeline and the electric flow regulating valve;

the first flowmeter, the inlet pressure sensor, the inlet temperature sensor, the outlet pressure sensor, the outlet temperature sensor, the outlet flowmeter and the electric flow regulating valve are all in electric signal connection with the control system; the control system is used for receiving and processing data of the first flowmeter, the inlet pressure sensor and the inlet temperature sensor and controlling the opening degree of the flow electric regulating valve; the control system is used for receiving and processing the data of the outlet pressure sensor, the outlet temperature sensor and the outlet flow meter and controlling the power of the electric heater.

2. The saturated water loop system for preventing cavitation of the circulation pump according to claim 1, wherein the water injection system further comprises a water injection temperature sensor, a water injection pressure sensor, a second flow meter provided on the water injection line; the water injection temperature sensor, the water injection pressure sensor and the second flow meter are all arranged between the plunger pump and the flow electric regulating valve; and the water injection temperature sensor, the water injection pressure sensor and the second flowmeter are all in electric signal connection with the control system.

3. The saturated water circuit system for preventing cavitation of a circulation pump according to claim 1, further comprising a drain pressure sensor and a drain temperature sensor provided on the drain line; the drainage pressure sensor and the drainage temperature sensor are both arranged between the electric heater and the output end of the drainage pipeline; and the drainage pressure sensor and the drainage temperature sensor are both in electric signal connection with the control system.

4. The saturated water loop system for preventing cavitation of the circulating pump according to claim 1, wherein the control system comprises a data acquisition card, a control terminal, the data acquisition card is used for receiving data of the first flow meter, the inlet pressure sensor, the inlet temperature sensor, the outlet pressure sensor, the outlet temperature sensor, the outlet flow meter, the water filling temperature sensor, the water filling pressure sensor, the second flow meter, the water discharge pressure sensor and the water discharge temperature sensor and transmitting the data to the control terminal; and the control terminal is used for processing the received data and controlling the opening and closing of the zipper electric regulating valve and the power of the electric heater.

5. The saturated water circuit system for preventing cavitation of a circulation pump according to claim 1, wherein the plunger pump is a high pressure plunger pump.

6. A saturated water circuit system for preventing cavitation of a circulation pump according to claim 1, wherein a return water pressure sensor is further provided at an input end of the return water pipe.

Technical Field

The invention belongs to the technical field of cavitation prevention of a high-temperature and high-pressure water circulating system, and particularly relates to a saturated water loop system for preventing cavitation of a circulating pump.

Background

The high-temperature high-pressure saturated water circulation loop is commonly used in the fields of nuclear energy, chemical industry, pharmacy and the like. The high-temperature high-pressure saturated water loop circulates through the operation of the circulating pump, the high-temperature water in a saturated state enters the circulating pump to generate a cavitation phenomenon, the cavitation greatly affects the damage and the service life of the pump, high-strength impact waves are generated, the impeller and the pump shell are impacted, and the vibration is caused by noise. In order to avoid cavitation, high-temperature water at the inlet of the circulating pump is usually subcooled to a certain degree, but the water at the outlet of the circulating pump cannot reach a saturated state and cannot meet the process requirements.

In practical engineering application, techniques such as steam pressurization, jet pressurization and the like are used for preventing cavitation. The steam pressurization is realized by pressurizing in the water collecting tank of high-temperature water to improve the pressure intensity of the water pump inlet, so that the pressure in the water collecting tank is improved, the high-temperature water flows into the water collecting tank, the system cannot operate effectively, and part of power steam needs to be lost. The injection supercharging method is widely applied to practical use. However, the existing injection supercharging device is influenced by the conveying back pressure and the structure of the injector, so that the operation state is unstable, the backflow pressure changes, the backflow amount is large, frequent adjustment is needed, and the defects of low efficiency of the injector, poor supercharging effect, cavitation inside the injector and the like exist. In addition, the traditional anti-cavitation device of the centrifugal pump mainly takes the installation of an inducer, the adjustment of the installation height of the pump and the size of an inlet of the pump as main points. These devices increase cost and reduce operating efficiency.

Disclosure of Invention

The invention aims to provide a saturated water loop system for preventing a circulating pump from cavitation so as to solve the problem that the existing cavitation prevention device is complex and high in cost.

In order to solve the problems, the technical scheme of the invention is as follows:

the invention discloses a saturated water loop system for preventing cavitation of a circulating pump, which comprises a water injection system, a saturated water loop system and a control system;

the saturated water loop system comprises a water return pipeline, a converging pipeline, a water discharge pipeline, a circulating pump, a first flowmeter, an inlet pressure sensor, an inlet temperature sensor, an outlet pressure sensor, an outlet temperature sensor, an outlet flowmeter and an electric heater, wherein the first flowmeter is arranged on the water return pipeline;

the input end of the water return pipeline is communicated with an external system, the output end of the water return pipeline is communicated with the input end of the converging pipeline, the output end of the converging pipeline is communicated with the input end of the circulating pump, the output end of the circulating pump is communicated with the input end of the drainage pipeline, and the output end of the drainage pipeline is communicated with the external system; the outlet pressure sensor, the outlet temperature sensor and the outlet flowmeter are all arranged between the input end of the drainage pipeline and the electric heater;

the water injection system comprises a water injection pipeline, a water supplementing water tank, a plunger pump and an electric flow regulating valve, wherein the plunger pump and the electric flow regulating valve are arranged on the water injection pipeline; the input end of the water injection pipeline is communicated with the output end of the water replenishing water tank, and the output end of the water injection pipeline is communicated with the input end of the round pipeline; the plunger pump is arranged between the output end of the water injection pipeline and the electric flow regulating valve;

the first flowmeter, the inlet pressure sensor, the inlet temperature sensor, the outlet pressure sensor, the outlet temperature sensor, the outlet flowmeter and the electric flow regulating valve are all in electric signal connection with the control system; the control system is used for receiving and processing data of the first flowmeter, the inlet pressure sensor and the inlet temperature sensor and controlling the opening degree of the flow electric regulating valve; the control system is used for receiving and processing the data of the outlet pressure sensor, the outlet temperature sensor and the outlet flow meter and controlling the power of the electric heater.

The saturated water loop system for preventing the cavitation of the circulating pump comprises a water injection system, a water injection temperature sensor, a water injection pressure sensor and a second flowmeter, wherein the water injection system also comprises the water injection temperature sensor, the water injection pressure sensor and the second flowmeter which are arranged on a water injection pipeline; the water injection temperature sensor, the water injection pressure sensor and the second flow meter are all arranged between the plunger pump and the flow electric regulating valve; and the water injection temperature sensor, the water injection pressure sensor and the second flowmeter are all in electric signal connection with the control system.

The saturated water loop system for preventing the cavitation of the circulating pump also comprises a drainage pressure sensor and a drainage temperature sensor which are arranged on the drainage pipeline; the drainage pressure sensor and the drainage temperature sensor are both arranged between the electric heater and the output end of the drainage pipeline; and the drainage pressure sensor and the drainage temperature sensor are both in electric signal connection with the control system.

The control system comprises a data acquisition card and a control terminal, wherein the data acquisition card is used for receiving data of the first flowmeter, the inlet pressure sensor, the inlet temperature sensor, the outlet pressure sensor, the outlet temperature sensor, the outlet flow meter, the water injection temperature sensor, the water injection pressure sensor, the second flowmeter, the drainage pressure sensor and the drainage temperature sensor and transmitting the data to the control terminal; and the control terminal is used for processing the received data and controlling the opening and closing of the zipper electric regulating valve and the power of the electric heater.

According to the saturated water loop system for preventing the cavitation of the circulating pump, the plunger pump is a high-pressure plunger pump.

According to the saturated water loop system for preventing the cavitation of the circulating pump, the return water pressure sensor is further arranged at the input end of the return water pipeline.

Due to the adoption of the technical scheme, compared with the prior art, the invention has the following advantages and positive effects:

according to the embodiment of the invention, the first flow meter, the inlet pressure sensor and the inlet temperature sensor are arranged on the water return pipeline and the converging pipeline of the saturated water loop system, the water injection system is arranged at the input end of the converging pipeline, and the control system receives and processes data of the first flow meter, the inlet pressure sensor and the inlet temperature sensor and controls the opening of the flow electric regulating valve of the water injection system so as to ensure that the supercooling degree of high-temperature and high-pressure water at the input end of the circulating pump reaches a preset value; and an outlet pressure sensor, an outlet temperature sensor, an outlet flowmeter and an electric heater are also arranged on the water discharge pipeline, and a control system receives and processes data of the outlet pressure sensor, the outlet temperature sensor and the outlet flowmeter and then controls the power of the electric heater so as to ensure that the high-temperature and high-pressure water at the output end of the water discharge pipeline reaches a saturated water state. Through the cooperation of each sensor, the flow electric regulating valve and the electric heater in the whole process, the cavitation phenomenon of the circulating pump is effectively avoided, the output high-temperature and high-pressure water is ensured to reach a saturated water state, and the problems of complexity, high cost and low working efficiency of the conventional cavitation prevention device are solved.

Drawings

FIG. 1 is a schematic diagram of a saturated water loop system for preventing circulating pump cavitation in accordance with the present invention.

Description of reference numerals: 1: a water replenishing tank; 2: a plunger pump; 3: a water injection temperature sensor; 4: a water injection pressure sensor; 5: a second flow meter; 6: a flow electric regulating valve; 7: an inlet pressure sensor; 8: an inlet temperature sensor; 9: a circulation pump; 10: an outlet pressure sensor; 11: an outlet temperature sensor; 12: an outlet flow meter; 13: an electric heater; 14: a drainage pressure sensor; 15: a drain temperature sensor; 16: a drain line; 17: a water return pipeline; 18: a pressure sensor; 19: a first flow meter; 20: a water injection pipeline; 21: a converging line; 22: a data acquisition card; 23: a computer.

Detailed Description

The present invention provides a saturated water loop system for preventing cavitation of a circulation pump, which is described in detail with reference to the accompanying drawings and specific embodiments. Advantages and features of the present invention will become apparent from the following description and from the claims.

Referring to FIG. 1, in one embodiment, a saturated water loop system for preventing cavitation of a circulation pump includes a water injection system, a saturated water loop system, and a control system.

The saturated water loop system comprises a water return pipeline 17, a converging pipeline 21, a water discharge pipeline 16, a circulating pump 9, a first flowmeter 19 arranged on the water return pipeline 17, an inlet pressure sensor 7 and an inlet temperature sensor 8 arranged on the converging pipeline 21, an outlet pressure sensor 10 and an outlet temperature sensor 11 arranged on the water discharge pipeline 16, an outlet flowmeter 12 and an electric heater 13. The input and the external system intercommunication of return water pipeline 17, return water pipeline 17's output and the input intercommunication that joins pipeline 21, join pipeline 21's output and circulating pump 9's input intercommunication, circulating pump 9's output and drain line 16's input intercommunication, drain line 16's output and external system intercommunication. An outlet pressure sensor 10, an outlet temperature sensor 11 and an outlet flow meter 12 are provided between the input end of the drain line 16 and the electric heater 13.

The water injection system comprises a water injection pipeline 20, a water supplementing water tank 1, a plunger pump 2 and a flow electric regulating valve 6, wherein the plunger pump 2 and the flow electric regulating valve are arranged on the water injection pipeline 20. The input of water injection pipeline 20 communicates with the output of moisturizing water tank 1, and the output of water injection pipeline 20 communicates with the input of round pipeline. The plunger pump 2 is arranged between the output end of the water injection pipeline 20 and the electric flow regulating valve 6.

The first flow meter 19, the inlet pressure sensor 7, the inlet temperature sensor 8, the outlet pressure sensor 10, the outlet temperature sensor 11, the outlet flow meter 12 and the electric flow regulating valve 6 are all in electric signal connection with the control system. The control system is used for receiving and processing data of the first flow meter 19, the inlet pressure sensor 7 and the inlet temperature sensor 8 and controlling the opening degree of the flow electric regulating valve 6. The control system is used for receiving and processing data of the outlet pressure sensor 10, the outlet temperature sensor 11 and the outlet flow meter 12 and controlling the power of the electric heater 13.

The water injection system comprises a water return pipeline 17, a converging pipeline 21, a control system, a first flow meter 19, an inlet pressure sensor 7 and an inlet temperature sensor 8, wherein the first flow meter 19, the inlet pressure sensor 7 and the inlet temperature sensor 8 are arranged on the water return pipeline 17 and the converging pipeline 21 of the saturated water loop system, the water injection system is arranged at the input end of the converging pipeline 21, a certain supercooling degree of high-temperature high-pressure water at the input end of the circulating pump 9 is ensured, cavitation damage of the circulating pump 9 is prevented, the control system receives data of the first flow meter 19, the inlet pressure sensor 7 and the inlet temperature sensor 8, namely high-temperature high-pressure circulating water flow, pressure and temperature, the cold water amount required to be injected by the water injection system is calculated according to the three physical quantities and the preset supercooling degree of the input end of the circulating pump. The water discharge pipeline 16 is also provided with an outlet pressure sensor 10, an outlet temperature sensor 11, an outlet flowmeter 12 and an electric heater 13, a control system receives data of the outlet pressure sensor 10, the outlet temperature sensor 11 and the outlet flowmeter 12, namely the flow, the pressure and the temperature of the high-temperature and high-pressure water at the output end of the circulating pump 9, the thermal power required for heating the super-cooled high-temperature and high-pressure water at the output end of the circulating pump 9 to a saturated water state is obtained through calculation according to the three physical quantities, and the power of the electric heater 13 is controlled to ensure that the high-temperature and high-pressure water at the output end of the water discharge pipeline 16 reaches the saturated water state, so. Through the cooperation of each sensor, the flow electric regulating valve 6 and the electric heater 13 in the whole process, the cavitation phenomenon of the circulating pump 9 is effectively avoided, the output high-temperature and high-pressure water is ensured to reach a saturated water state, and the problems of complexity, high cost and low working efficiency of the conventional cavitation prevention device are solved.

In this embodiment, the water injection system further includes a water injection temperature sensor 3, a water injection pressure sensor 4, and a second flow meter 5, which are disposed on the water injection pipeline 20. The water injection temperature sensor 3, the water injection pressure sensor 4 and the second flow meter 5 are arranged between the plunger pump 2 and the flow electric regulating valve 6. And the water injection temperature sensor 3, the water injection pressure sensor 4 and the second flowmeter 5 are all in electric signal connection with the control system. The water injection temperature sensor 3 and the water injection pressure sensor 4 are arranged to realize real-time monitoring of the water temperature in the water injection pipeline 20 and to convey the water temperature to the control system, and the control system correspondingly adjusts the water injection amount of the water injection system. The second flowmeter 5 is arranged to monitor the water output of the water injection pipeline 20 in real time and feed back the water output to the control system, and the control system adjusts the opening of the flow electric regulating valve 6 according to the feedback to ensure that the supercooling degree of the high-temperature and high-pressure water at the input end of the circulating pump 9 reaches a preset value.

In this embodiment, the saturated water circuit system further includes a drain pressure sensor 14 and a drain temperature sensor 15 provided on the drain line 16. A drain pressure sensor 14 and a drain temperature sensor 15 are provided between the electric heater 13 and the output end of the drain line 16. And the drainage pressure sensor 14 and the drainage temperature sensor 15 are both in electric signal connection with the control system. The arrangement of the drainage pressure sensor 14 and the drainage temperature sensor 15 can monitor the high-temperature and high-pressure water at the output end of the drainage pipeline 16 in real time and feed the high-temperature and high-pressure water back to the control system, and the control system can adaptively adjust the power of the electric heater 13 so as to ensure that the output water reaches a saturated water state.

In this embodiment, the control system includes a data acquisition card 22 and a control terminal, and the data acquisition card 22 is configured to receive data of the first flow meter 19, the inlet pressure sensor 7, the inlet temperature sensor 8, the outlet pressure sensor 10, the outlet temperature sensor 11, the outlet flow meter 12, the water filling temperature sensor 3, the water filling pressure sensor 4, the second flow meter 5, the water discharge pressure sensor 14 and the water discharge temperature sensor 15 and transmit the data to the control terminal. The control terminal is used for processing the received data and controlling the opening and closing of the zipper electric regulating valve and the power of the electric heater 13. The control terminal is a computer 23, the data acquisition card 22 is a receiving terminal for each data, the data acquisition card 22 transmits the data to the computer 23, and the data is processed by the computer 23 and then outputs control signals to the corresponding flow electric regulating valve 6 and the electric heater 13.

Further, since the water pressure in the high-temperature high-pressure saturated water circulation circuit is high, the plunger pump 2 used is a high-pressure plunger pump.

Further, a return water pressure sensor 18 is also arranged at the input end of the return water pipeline 17.

The embodiments of the present invention have been described in detail with reference to the accompanying drawings, but the present invention is not limited to the above embodiments. Even if various changes are made to the present invention, it is still within the scope of the present invention if they fall within the scope of the claims of the present invention and their equivalents.