CN212376894U - Multi-circulating water pump outlet connection and control system - Google Patents
Multi-circulating water pump outlet connection and control system Download PDFInfo
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- CN212376894U CN212376894U CN202020453540.6U CN202020453540U CN212376894U CN 212376894 U CN212376894 U CN 212376894U CN 202020453540 U CN202020453540 U CN 202020453540U CN 212376894 U CN212376894 U CN 212376894U
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Abstract
The utility model relates to a multi-circulating water pump outlet connection and control system, which comprises a DCS centralized control system and two water supply units, wherein each water supply unit comprises a water supply main pipe, two circulating water pumps and two water pump outlet pipelines; the circulating water pumps are connected with the water pump outlet pipelines in a one-to-one correspondence manner, and an expansion joint and a hydraulic control check butterfly valve are sequentially arranged on each water pump outlet pipeline; a main pipe isolation valve, a first pressure transmitter and an ultrasonic flowmeter are sequentially arranged on the water supply main pipe; the two water pump outlet pipelines are both connected with the water supply main pipe, one water pump outlet pipeline is connected with the water inlet end of the water supply main pipe, and the connection point of the other water pump outlet pipeline and the water supply main pipe is positioned on the section of the water supply main pipe between the main pipe isolation valve and the first pressure transmitter; two water supply units are connected through a communicating pipe, and this application realizes the best ratio water supply of different circulating water volumes under the normal operating mode through the quantity and the inverter pump operation control that launch the circulating pump.
Description
Technical Field
The utility model relates to the technical field of energy, specifically say, relate to a many circulating water pump export connection and control system, mainly used solves the problem of being connected and controlling between many circulating water pump of steam power plant or thermal power plant and two water supply main pipes.
Background
The circulating water pump of a thermal power station or a thermal power station is one of the power consumers of a power plant, the circulating water pump system of a unit system cannot be effectively adjusted due to the fluctuation of circulating water caused by the reduction of condensed steam in different seasons or the reduction of the condensed steam, and the circulating water pumps of different units cannot be used simultaneously, so that the unreasonable operation of a trolley pulled by a large horse of the circulating water pump is often caused, and huge waste of energy is caused; when the unit is started, only the auxiliary machine operates, and a large circulating water pump needs to be started for a very small amount of circulating water, so that energy waste is also caused. In addition, the hydraulic control slow-closing check valve at the outlet of the circulating water pump is frequently adjusted and opened and closed along with the operation of the water pump, and the valve at the outlet of the circulating water pump is easily damaged, so that a great operation accident of stopping a power plant unit is forced to be caused.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to overcome the above-mentioned not enough that exists among the prior art, and provide a arrange reasonable in design, energy-conserving economy, many circulating water pump outlet of system adjustable and connect and control system.
The utility model provides a technical scheme that above-mentioned problem adopted is: the utility model provides a many circulating water pump export are connected and control system, includes DCS centralized control system, its characterized in that: the water supply system also comprises two water supply units, wherein each water supply unit comprises a water supply main pipe, two circulating water pumps and two water pump outlet pipelines; the circulating water pump in each water supply unit is connected with the water pump outlet pipelines in a one-to-one correspondence manner, and each water pump outlet pipeline is sequentially provided with an expansion joint and a hydraulic control check butterfly valve according to the water supply direction; a main pipe isolation valve, a first pressure transmitter and an ultrasonic flowmeter are sequentially arranged on the water supply main pipe according to the water supply direction; the two water pump outlet pipelines are both connected with the water supply main pipe, one water pump outlet pipeline is connected with the water inlet end of the water supply main pipe, and the connection point of the other water pump outlet pipeline and the water supply main pipe is positioned on the section of the water supply main pipe between the main pipe isolation valve and the first pressure transmitter; the two water supply units are connected through a communicating pipe, and an adjusting valve for controlling the two water supply units to be communicated or isolated is arranged on the communicating pipe; two ends of the communicating pipe are respectively connected to the two water supply main pipes; and the connection point of the communicating pipe and the water supply main pipe is positioned on the section of the water supply main pipe before the main pipe isolation valve; DCS centralized control system and circulating water pump, liquid accuse non return butterfly valve, female pipe isolating valve, pressure transmitter, ultrasonic flowmeter and governing valve all communication connection.
Preferably, the circulating water pumps are vertical diagonal flow pumps, at least one circulating water pump is driven by a variable frequency motor, and other circulating water pumps are driven by a power frequency motor. When only the auxiliary machine of the power plant operates, the circulating water quantity is extremely small, the variable frequency pump can operate, and the matched circulating water quantity is realized by adjusting the operating condition of the variable frequency pump.
Preferably, still be provided with No. two pressure transmitter on every water pump outlet pipeline, No. two pressure transmitter are located between expansion joint and the liquid accuse non return butterfly valve, No. two pressure transmitter and DCS centralized control system communication connection. The second pressure transmitter is used for monitoring the running condition of the water pump by combining the motor current detection of the circulating water pump.
Compared with the prior art, the utility model, have following advantage and effect:
1. the operation of only auxiliary machines in the power plant is realized, the circulating water quantity is extremely small, and the energy-saving measure of matching water is realized by starting a variable-frequency circulating water pump;
2. the optimal proportioning water supply of different circulating water quantities under normal working conditions is realized by starting the number of circulating pumps and controlling the operation of the variable frequency pump; the proper water consumption of the two water supply main pipes is realized by controlling the regulating valve on the communicating pipe;
3. the isolation valve is arranged on the water supply main pipe, so that half of the circulating water pump system cannot run due to damage of the water pump and the outlet valve of the water pump, and the safety of the system is improved;
4. when one water supply main pipe has the problem, the corresponding isolation valve can be closed, and the water supply amount of the whole system is increased.
Drawings
In order to illustrate the embodiments of the present invention or the solutions in the prior art more clearly, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
Fig. 1 is a schematic structural diagram of an embodiment of the present invention.
Description of reference numerals:
circulating water pumps 11, 21, 31, 41; expansion joints 12, 22, 32, 42;
hydraulic control check butterfly valves 13, 23, 33, 43; pressure transmitter number two 14, 24, 34, 44;
the regulating valve 01, the communicating pipe 04 and the water supply main pipe 05; main pipe isolation valves 02 and 03;
pressure transmitter number one 06, 07; ultrasonic flow meters 08, 09.
Detailed Description
The present invention will be described in further detail by way of examples with reference to the accompanying drawings, which are illustrative of the present invention and are not intended to limit the present invention.
Examples are given.
Referring to fig. 1, the present embodiment discloses a system for connecting and controlling multiple circulating water pump outlets, which includes a DCS centralized control system and two water supply units, the DCS centralized control system refers to the prior art,
in this embodiment, every water supply unit all includes a water supply female pipe, two circulating water pump and two water pump outlet pipeline. The circulating water pump in each water supply unit is connected with the water pump outlet pipelines in a one-to-one correspondence manner, and each water pump outlet pipeline is sequentially provided with an expansion joint and a hydraulic control check butterfly valve according to the water supply direction; the main water supply pipe is sequentially provided with a main pipe isolation valve, a first pressure transmitter and an ultrasonic flowmeter according to the water supply direction.
In this embodiment, two water pump outlet pipelines all are connected with the female pipe that supplies water, and one of them water pump outlet pipeline is connected with the end of intaking of the female pipe that supplies water, and the tie point of another water pump outlet pipeline and the female pipe that supplies water is located that section of the female pipe that supplies water between female pipe isolating valve and a pressure transmitter.
In this embodiment, the two water supply units include four circulating water pumps 11, 21, 31 and 41, four expansion joints 12, 22, 32 and 42, four pilot-operated check butterfly valves 13, 23, 33 and 43, two water supply main pipes 05, two main pipe isolation valves 02 and 03, two first pressure transmitters 06 and 07, and two ultrasonic flow meters 08 and 09. The four circulating water pumps adopt vertical diagonal flow pumps, wherein the circulating water pump 21 is a variable-frequency water supply pump and is driven by a variable-frequency motor, and the other three circulating water pumps are common (power frequency) water pumps and are driven by power frequency motors. When only the auxiliary machine of the power plant operates, the circulating water quantity is extremely small, the variable frequency pump can operate, and the matched circulating water quantity is realized by adjusting the operating condition of the variable frequency pump.
In this embodiment, the two water supply units are connected by a communicating pipe 04, and the communicating pipe 04 is provided with an adjusting valve 01 for controlling the two water supply units to communicate or isolate; two ends of the communicating pipe 04 are respectively connected to the two water supply main pipes 05; and the connection point of the communicating pipe 04 to the water supply main 05 is located on the section of the water supply main before the main isolation valve. Each water supply main pipe is 75 percent of the water supply pipe diameter of the total water supply amount of the system; the pipe diameter of the communicating pipe 04 is the pipe diameter of the water pump outlet.
In this embodiment, DCS centralized control system and circulating water pump, liquid accuse non return butterfly valve, female pipe isolating valve, pressure transmitter, ultrasonic flowmeter and governing valve all communication connection.
In this embodiment, still be provided with No. two pressure transmitter on every water pump outlet pipeline, No. two pressure transmitter are located between expansion joint and the liquid accuse non return butterfly valve, No. two pressure transmitter and DCS centralized control system communication connection. Four pressure transmitters 14, 24, 34 and 44 are used to monitor the operating conditions of the water pumps in conjunction with the motor current sensing of the four circulating water pumps, respectively.
In this embodiment, the two water supply main pipes 05 are communicated through the communication pipe 04, so that flexible operation in which four sets of water pump systems are mutually standby or two sets of water supply units are mutually standby is realized, and when any one of the three circulating water pumps has a problem, the other three circulating water pumps can meet the total water supply amount of 75%; the system can realize the starting of one, two and three until four water supply working conditions according to the water demand.
In this embodiment, the communicating pipe 04 is provided with the regulating valve 01, the vacuum degree of the condenser, the return water temperature of the circulating water and the inlet water temperature of the circulating water are combined according to real-time monitoring data of the pressure and the flow on the water supply main pipe, the DCS centralized control system performs comparative analysis by comparing the relation curve of the power generation amount and the flow of the steam turbine, the opening degree of the regulating valve 01 and the operation condition of the variable-frequency circulating water pump 21 are controlled, the water supply amount is more accurately regulated, and the optimal operation condition of the whole water supply system is achieved. In addition, the regulating valve can be closed to realize the completely independent operation and control of the two water supply main pipes.
When only the auxiliary machines of the power plant operate, the circulating water amount is extremely small, the frequency conversion circulating water pump 21 can be opened only, the frequency converter of the water pump is adjusted by the DCS centralized control system, the water outlet amount of the water pump is controlled, and meanwhile, the adjusting valve 01 can be coordinated to realize optimal balanced water supply of the whole system.
When the circulating water pumps 11, 21, 31 and 41 are in failure or damaged, closing isolation maintenance is carried out through the hydraulic control check butterfly valves 13, 23, 33 and 43 at the outlets of the respective water pumps, and interference on system operation is reduced.
The two isolating valves 02 and 03 and the regulating valve 01 are arranged, so that the influence of the faults or leakage of the hydraulic control check butterfly valves 13, 23, 33 and 43 at the outlet of the water pump on the water supply system can be reduced, 75% of total water supply is realized, and the water supply safety of the system is improved. The specific operation is as follows:
when the hydraulic control check butterfly valve 13 at the outlet of the circulating water pump 11 breaks down or leaks, the maintenance can be carried out by closing the isolating valve 02, and the water supply of three circulating water pumps can be realized;
when the hydraulic control check butterfly valve 23 at the outlet of the circulating water pump 21 fails or leaks, the maintenance can be carried out by closing the isolating valve 02 and the regulating valve 01, and the water supply of the three circulating water pumps can be realized;
when the hydraulic control check butterfly valve 33 at the outlet of the circulating water pump 31 fails or leaks, the maintenance can be carried out by closing the isolating valve 03 and the regulating valve 01, and the water supply of three circulating water pumps can be realized;
when the hydraulic control check butterfly valve 43 at the outlet of the circulating water pump 41 breaks down or leaks, the isolating valve 03 can be closed for maintenance, and water supply of the three circulating water pumps is realized.
When two main pipes of supplying water one of them broke down, can all realize 75% water supply through closing isolating valve 01 or isolating valve 02, improved the water supply security, specifically realize as follows: when the No. 1 water supply main pipe has a fault, closing the isolation valve 02 and stopping the circulating water pump 11 for maintenance, and opening the other three water pumps and valves for operation; when the 2# water supply main pipe breaks down, the isolation valve 03 is closed, the circulating water pump 41 is stopped, maintenance is carried out, and the rest three water pumps and valves are opened to operate.
In addition, it should be noted that the specific embodiments described in the present specification may be different in the components, the shapes of the components, the names of the components, and the like, and the above description is only an example of the structure of the present invention. All the equivalent changes or simple changes made according to the structure, characteristics and principle of the utility model are included in the protection scope of the utility model. Various modifications, additions and substitutions may be made by those skilled in the art without departing from the scope of the invention as defined in the accompanying claims.
Claims (3)
1. The utility model provides a many circulating water pump export are connected and control system, includes DCS centralized control system, its characterized in that: the water supply system also comprises two water supply units, wherein each water supply unit comprises a water supply main pipe, two circulating water pumps and two water pump outlet pipelines; the circulating water pump in each water supply unit is connected with the water pump outlet pipelines in a one-to-one correspondence manner, and each water pump outlet pipeline is sequentially provided with an expansion joint and a hydraulic control check butterfly valve according to the water supply direction; a main pipe isolation valve, a first pressure transmitter and an ultrasonic flowmeter are sequentially arranged on the water supply main pipe according to the water supply direction; the two water pump outlet pipelines are both connected with the water supply main pipe, one water pump outlet pipeline is connected with the water inlet end of the water supply main pipe, and the connection point of the other water pump outlet pipeline and the water supply main pipe is positioned on the section of the water supply main pipe between the main pipe isolation valve and the first pressure transmitter; the two water supply units are connected through a communicating pipe, and an adjusting valve for controlling the two water supply units to be communicated or isolated is arranged on the communicating pipe; two ends of the communicating pipe are respectively connected to the two water supply main pipes; and the connection point of the communicating pipe and the water supply main pipe is positioned on the section of the water supply main pipe before the main pipe isolation valve; DCS centralized control system and circulating water pump, liquid accuse non return butterfly valve, female pipe isolating valve, pressure transmitter, ultrasonic flowmeter and governing valve all communication connection.
2. The multiple circulating water pump outlet connection and control system of claim 1, wherein: the circulating water pumps adopt vertical diagonal flow pumps, at least one circulating water pump is driven by a variable frequency motor, and other circulating water pumps are driven by a power frequency motor.
3. The multiple circulating water pump outlet connection and control system of claim 1, wherein: still be provided with No. two pressure transmitter on every water pump outlet pipeline, No. two pressure transmitter are located between expansion joint and the liquid accuse non return butterfly valve, and No. two pressure transmitter and DCS centralized control system communication are connected.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020453540.6U CN212376894U (en) | 2020-03-31 | 2020-03-31 | Multi-circulating water pump outlet connection and control system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020453540.6U CN212376894U (en) | 2020-03-31 | 2020-03-31 | Multi-circulating water pump outlet connection and control system |
Publications (1)
| Publication Number | Publication Date |
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| CN212376894U true CN212376894U (en) | 2021-01-19 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202020453540.6U Active CN212376894U (en) | 2020-03-31 | 2020-03-31 | Multi-circulating water pump outlet connection and control system |
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| Country | Link |
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| CN (1) | CN212376894U (en) |
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2020
- 2020-03-31 CN CN202020453540.6U patent/CN212376894U/en active Active
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