CN201560920U - Automatic speed-adjusting feed water pump - Google Patents
Automatic speed-adjusting feed water pump Download PDFInfo
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- CN201560920U CN201560920U CN200920014501XU CN200920014501U CN201560920U CN 201560920 U CN201560920 U CN 201560920U CN 200920014501X U CN200920014501X U CN 200920014501XU CN 200920014501 U CN200920014501 U CN 200920014501U CN 201560920 U CN201560920 U CN 201560920U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A20/00—Water conservation; Efficient water supply; Efficient water use
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Abstract
本实用新型提供一种自动调速给水泵，包括给水泵、最小流量阀、给水泵跳闸回路和最小流量阀控制装置；在给水泵的入口处设置有压力传感器，在给水泵的出口处设置有压力传感器和流量探测器，在给水泵内还设置有转速传感器及电流采集器，最小流量阀控制装置包括PLC控制柜和微机；PLC控制柜通过电路与微机连接；所述压力传感器、流量探测器、转速传感器及电流采集器均通过线路连接至PLC控制柜，PLC控制柜则一方面连接至最小流量阀，另一方面连接至给水泵跳闸回路；在最小流量阀内也设置有流量探测器，该流量探测器也通过线路连接至PLC控制柜。该装置提高了泵组的经济性和安全性和操作的方便性。
The utility model provides an automatic speed-regulating feedwater pump, which comprises a feedwater pump, a minimum flow valve, a feedwater pump trip circuit and a minimum flow valve control device; a pressure sensor is arranged at the inlet of the feedwater pump, and a pressure sensor is arranged at the outlet of the feedwater pump. The pressure sensor and flow detector are also provided with a speed sensor and a current collector in the feed water pump. The minimum flow valve control device includes a PLC control cabinet and a microcomputer; the PLC control cabinet is connected to the microcomputer through a circuit; the pressure sensor, flow detector , speed sensor and current collector are all connected to the PLC control cabinet through lines, and the PLC control cabinet is connected to the minimum flow valve on the one hand, and connected to the tripping circuit of the feed water pump on the other hand; a flow detector is also installed in the minimum flow valve, The flow detector is also wired to the PLC control cabinet. The device improves the economy, safety and operation convenience of the pump set.
Description
技术领域：本实用新型涉及一种锅炉给水系统中的自动调速给水泵，属于机电一体化领域。Technical field: The utility model relates to an automatic speed-regulating feedwater pump in a boiler feedwater system, which belongs to the field of electromechanical integration.
背景技术：目前的国内的自动调速给水泵中均通过最小流量阀来控制自动调速给水泵，而最小流量阀的控制，均采用传统的由流量孔板测取压差信号、再经过流量变送器转换为流量信号，去控制给水泵最小流量阀开关的方式。该装置的控制过程较烦琐、费用相对较高、准确性和可靠性稍差。Background technology: In the current domestic automatic speed-adjusting feedwater pumps, the automatic speed-regulating feedwater pump is controlled by the minimum flow valve, and the control of the minimum flow valve adopts the traditional method of measuring the pressure difference signal by the flow orifice plate, and then passing the flow rate. The transmitter is converted into a flow signal to control the switch of the minimum flow valve of the feed water pump. The control process of the device is cumbersome, the cost is relatively high, and the accuracy and reliability are slightly poor.
发明内容：Invention content:
发明目的：本实用新型提供一种自动调速给水泵，其目的是解决以往的自动调速给水泵控制过程较烦琐、费用相对较高、准确性和可靠性稍差的问题，该装置是用模拟流量信号代替实测流量信号，自动控制给水泵最小流量阀的开关。Purpose of the invention: This utility model provides an automatic speed-regulating feedwater pump, the purpose of which is to solve the problems of cumbersome control process, relatively high cost, and slightly poor accuracy and reliability of the previous automatic speed-regulating feedwater pump. The simulated flow signal replaces the measured flow signal to automatically control the switch of the minimum flow valve of the feed water pump.
技术方案：本实用新型是通过以下技术方案实现的：Technical solution: the utility model is realized through the following technical solutions:
一种自动调速给水泵，包括给水泵、最小流量阀、给水泵跳闸回路和最小流量阀控制装置；最小流量阀设置在给水泵的最小流量管路上并与最小流量阀控制装置连接；在给水泵的入口处设置有压力传感器，在给水泵的出口处设置有压力传感器和流量探测器，在给水泵内还设置有转速传感器及电流采集器，其特征在于：最小流量阀控制装置包括PLC控制柜和微机；PLC控制柜通过电路与微机连接；所述压力传感器、流量探测器、转速传感器及电流采集器均通过线路连接至PLC控制柜的输入端，PLC控制柜的输出端则一方面连接至最小流量阀，另一方面连接至给水泵跳闸回路；在最小流量阀内也设置有流量探测器，该流量探测器也通过线路连接至PLC控制柜的饿输入端。An automatic speed-adjusting feedwater pump, comprising a feedwater pump, a minimum flow valve, a feedwater pump trip circuit and a minimum flow valve control device; the minimum flow valve is set on the minimum flow pipeline of the feedwater pump and connected with the minimum flow valve control device; A pressure sensor is installed at the inlet of the water pump, a pressure sensor and a flow detector are installed at the outlet of the feed water pump, and a speed sensor and a current collector are also installed in the feed water pump. The feature is that the minimum flow valve control device includes PLC control cabinet and microcomputer; the PLC control cabinet is connected with the microcomputer through a circuit; the pressure sensor, flow detector, speed sensor and current collector are all connected to the input end of the PLC control cabinet through lines, and the output end of the PLC control cabinet is connected to the To the minimum flow valve, on the other hand, it is connected to the tripping circuit of the feed water pump; a flow detector is also set in the minimum flow valve, and the flow detector is also connected to the hungry input end of the PLC control cabinet through a line.
在给水泵内还设置有除氧器，除氧器内设置有压力传感器，该压力传感器也连接至PLC控制柜的输入端。A deaerator is also arranged in the feed water pump, and a pressure sensor is arranged in the deaerator, and the pressure sensor is also connected to the input end of the PLC control cabinet.
优点及效果：本实用新型提供一种自动调速给水泵，包括给水泵、最小流量阀、给水泵跳闸回路和最小流量阀控制装置；最小流量阀设置在给水泵的出水管路上并与最小流量阀控制装置连接；在给水泵的入口处设置有压力传感器，在给水泵的出口处设置有压力传感器和流量探测器，在给水泵内还设置有转速传感器及电流采集器，最小流量阀控制装置包括PLC控制柜和微机；PLC控制柜通过电路与微机连接；所述压力传感器、流量探测器、转速传感器及电流采集器均通过线路连接至PLC控制柜的输入端，PLC控制柜的输出端则一方面连接至最小流量阀，另一方面连接至给水泵跳闸回路；在最小流量阀内也设置有流量探测器，该流量探测器也通过线路连接至PLC控制柜的输入端。在水泵内还设置有除氧器，除氧器内设置有压力传感器，该压力传感器也连接至PLC控制柜的输入端。Advantages and effects: The utility model provides an automatic speed-regulating feedwater pump, including a feedwater pump, a minimum flow valve, a feedwater pump trip circuit and a minimum flow valve control device; the minimum flow valve is set on the outlet pipeline of the feedwater pump and connected with the minimum flow The valve control device is connected; a pressure sensor is installed at the inlet of the feed water pump, a pressure sensor and a flow detector are installed at the outlet of the feed water pump, a speed sensor and a current collector are also installed in the feed water pump, and the minimum flow valve control device It includes a PLC control cabinet and a microcomputer; the PLC control cabinet is connected to the microcomputer through a circuit; the pressure sensor, flow detector, speed sensor and current collector are all connected to the input end of the PLC control cabinet through lines, and the output end of the PLC control cabinet is On the one hand, it is connected to the minimum flow valve, and on the other hand, it is connected to the tripping circuit of the feed water pump; a flow detector is also arranged in the minimum flow valve, and the flow detector is also connected to the input end of the PLC control cabinet through a line. A deaerator is also arranged in the water pump, and a pressure sensor is arranged in the deaerator, and the pressure sensor is also connected to the input end of the PLC control cabinet.
该装置用原有系统中的给水泵入口压力、给水泵出口压力、给水泵转速，通过最小流量阀控制装置的计算得出给水泵流量值，并用计算流量值，自动控制最小流量阀的开关。为防止泵在高转速下，流量计算值有误，最小流量阀控制装置会取除氧器压力、给水泵出口压力、给水泵转速及给水泵电流等参数值，判断流量过低时，最小流量阀自动全开。The device uses the inlet pressure of the feed water pump, the outlet pressure of the feed water pump and the speed of the feed water pump in the original system to calculate the flow value of the feed water pump through the calculation of the minimum flow valve control device, and uses the calculated flow value to automatically control the switch of the minimum flow valve. In order to prevent errors in the flow calculation value of the pump at high speed, the minimum flow valve control device will take the deaerator pressure, feed water pump outlet pressure, feed water pump speed and feed water pump current and other parameter values, and when the flow is judged to be too low, the minimum flow The valve opens fully automatically.
该装置主要实现的功能如下：The main functions of the device are as follows:
a.给水泵出口流量小于最小流量曲线值，最小流量阀自动开启20％；a. The outlet flow of the feed water pump is less than the minimum flow curve value, and the minimum flow valve is automatically opened by 20%;
b.给水泵出口流量小于设定的某一值时，最小流量阀自动开启100％，如果在规定时间内未开，最小流量阀控制装置启动给水泵跳闸回路，使得给水泵自动停止；b. When the outlet flow rate of the feed water pump is less than a set value, the minimum flow valve will automatically open 100%. If it is not opened within the specified time, the minimum flow valve control device will start the trip circuit of the feed water pump, so that the feed water pump will automatically stop;
c.给水泵出口流量大于最大流量曲线值，即泵运行工况跑出工作区，发给水泵出口流量过大报警信号；c. The outlet flow rate of the feed water pump is greater than the maximum flow curve value, that is, the pump runs out of the working area under operating conditions, and an alarm signal for excessive flow at the outlet of the feed water pump is sent;
d.当给水泵出口门开启时，流量大于某一值，给水泵最小流量阀自动关闭。d. When the outlet door of the feed water pump is opened, the flow rate is greater than a certain value, and the minimum flow valve of the feed water pump is automatically closed.
e.在线监测给给水泵运行工况点。e. On-line monitoring of the operating point of the feed water pump.
该实用新型简化了系统原有控制环节，提高了控制信号发出的准确性和可靠性；并取消了原始的调速给水泵的节流孔板、流量变速器和流量开关，节省了加工制造和安装维护费用，使得该实用新型的费用远小于原始调速给水泵的费用。This utility model simplifies the original control link of the system, improves the accuracy and reliability of the control signal; and cancels the throttle orifice, flow rate changer and flow switch of the original speed-regulating feed water pump, saving manufacturing and installation The maintenance cost makes the cost of the utility model far less than that of the original speed-regulating feed water pump.
该装置流量的测量方法，取消了原有的节流孔板，减少了给水系统的节流损失，提高了泵组的经济性。对国家发改委倡导的节能减排，具有一定的实际意义。The flow measurement method of the device cancels the original throttling orifice, reduces the throttling loss of the water supply system, and improves the economy of the pump set. It has certain practical significance for the energy conservation and emission reduction advocated by the National Development and Reform Commission.
该装置提高泵组的经济型和安全性、提高运行操作的方便性；可以作为产品广泛生产，效益可观；The device improves the economy and safety of the pump unit and improves the convenience of operation; it can be widely produced as a product with considerable benefits;
附图说明：Description of drawings:
图1为本实用新型的结构示意图。Fig. 1 is the structural representation of the utility model.
具体实施方式：下面结合附图对本实用新型做进一步的说明：The specific embodiment: the utility model is further described below in conjunction with the accompanying drawings:
如图1所示，本实用新型提供一种自动调速给水泵，其包括给水泵、最小流量阀1、给水泵跳闸回路和最小流量阀控制装置；最小流量阀设置在给水泵的最小流量管路2上并与最小流量阀控制装置连接；所述的最小流量管路2也就是给水泵的出水管路；在给水泵的入口处设置有压力传感器，在给水泵的出口处设置有压力传感器和流量探测器，在给水泵内还设置有转速传感器及电流采集器。As shown in Figure 1, the utility model provides an automatic speed-adjusting feedwater pump, which includes a feedwater pump, a minimum flow valve 1, a feedwater pump trip circuit and a minimum flow valve control device; the minimum flow valve is set on the minimum flow pipe of the feedwater pump On the road 2 and connected with the minimum flow valve control device; the minimum flow pipeline 2 is the outlet pipeline of the feed water pump; a pressure sensor is provided at the inlet of the feed water pump, and a pressure sensor is provided at the outlet of the feed water pump And flow detectors, speed sensors and current collectors are also installed in the feed water pump.
最小流量阀控制装置包括PLC控制柜3和微机4；PLC控制柜3通过电路与微机4连接；上述所有的压力传感器、流量探测器、转速传感器及电流采集器均通过线路连接至PLC控制柜3的输入端，PLC控制柜3的输出端则一方面连接至最小流量阀10，另一方面连接至给水泵跳闸回路；在最小流量阀1内也设置有流量探测器，该流量探测器也通过线路连接至PLC控制柜的饿输入端。The minimum flow valve control device includes a PLC control cabinet 3 and a microcomputer 4; the PLC control cabinet 3 is connected to the microcomputer 4 through a circuit; all the above-mentioned pressure sensors, flow detectors, speed sensors and current collectors are connected to the PLC control cabinet 3 through lines The input end of the PLC control cabinet 3 is connected to the minimum flow valve 10 on the one hand, and the tripping circuit of the feed water pump on the other hand; a flow detector is also arranged in the minimum flow valve 1, and the flow detector is also passed through The line is connected to the hungry input of the PLC control cabinet.
在给水泵内还设置有除氧器，除氧器内设置有压力传感器，该压力传感器也通过线路连接至PLC控制柜3的输入端。A deaerator is also arranged in the feed water pump, and a pressure sensor is arranged in the deaerator, and the pressure sensor is also connected to the input end of the PLC control cabinet 3 through a line.
该自动调速给水泵采用数字电子逻辑回路，然后向PLC控制柜3内输入给水泵转速、给水泵电流、给水泵入口压力、给水泵出口压力、除氧器压力、给水泵出口门及再循环门的开关位置等信号，进行编制数学模型，模拟出若干个曲线族，输出模拟流量值，根据调速泵最小流量特性曲线或实测特性设置门槛值，再用实测模拟流量值与所对应的门槛值进行比较，从而对最小流量阀1发出开关及报警等控制指令。The automatic speed-adjusting feedwater pump adopts a digital electronic logic circuit, and then inputs the feedwater pump speed, feedwater pump current, feedwater pump inlet pressure, feedwater pump outlet pressure, deaerator pressure, feedwater pump outlet door and recirculation into the PLC control cabinet 3 Signals such as the switch position of the door, compile a mathematical model, simulate several curve families, output the simulated flow value, set the threshold value according to the minimum flow characteristic curve of the speed-regulating pump or the measured characteristic, and then use the measured simulated flow value and the corresponding threshold Values are compared, so as to issue control commands such as switching and alarming to the minimum flow valve 1.
该自动调速给水泵用原有系统中的的给水泵入口压力、给水泵出口压力、给水泵转速，计算得出给水泵流量值。并用计算流量值，自动控制最小流量阀1的开关。为防止泵在高转速下，流量计算值有误，最小流量阀控制装置会取除氧器压力、给水泵出口压力、给水泵转速及给水泵电流等参数值，判断流量过低时，最小流量阀1自动全开。The automatic speed-adjusting feedwater pump uses the inlet pressure of the feedwater pump, the outlet pressure of the feedwater pump, and the rotational speed of the feedwater pump in the original system to calculate the flow rate of the feedwater pump. And use the calculated flow value to automatically control the switch of the minimum flow valve 1. In order to prevent errors in the flow calculation value of the pump at high speed, the minimum flow valve control device will take the deaerator pressure, feed water pump outlet pressure, feed water pump speed and feed water pump current and other parameter values, and when the flow is judged to be too low, the minimum flow Valve 1 is automatically fully opened.
该该自动调速给水泵主要实现功能如下：The main functions of the automatic speed-adjusting feed water pump are as follows:
a.给水泵出口流量小于最小流量曲线值时，最小流量阀1自动开启20％；a. When the outlet flow of the feed water pump is less than the minimum flow curve value, the minimum flow valve 1 is automatically opened by 20%;
b.给水泵出口流量小于预先设定的某一值的时候，最小流量阀1自动开启100％，如果在规定时间内未开，最小流量阀控制装置就会启动给水泵跳闸回路，使得给水泵自动停止；b. When the outlet flow rate of the feed water pump is less than a preset value, the minimum flow valve 1 will automatically open 100%. Automatic stop;
c.给水泵出口流量大于最大流量曲线值，即泵运行工况跑出工作区，发给水泵出口流量过大报警信号；c. The outlet flow rate of the feed water pump is greater than the maximum flow curve value, that is, the pump runs out of the working area under operating conditions, and an alarm signal for excessive flow at the outlet of the feed water pump is sent;
d.当给水泵出口门开启时，流量大于某一值，给水泵跳闸回路就会控制给水泵最小流量阀1自动关闭。d. When the outlet door of the feed water pump is opened and the flow rate is greater than a certain value, the trip circuit of the feed water pump will control the minimum flow valve 1 of the feed water pump to automatically close.
e.在线监测给水泵运行工况点。e. On-line monitoring of the operating point of the feed water pump.
该自动调速给水泵简化了系统原有控制环节，提高了控制信号发出的准确性和可靠性，其取消了节流孔板、流量变速器和流量开关，节省了加工制造和安装维护费用，这样就使得该装置的费用远小于原调速给水泵的费用；该装置流量的测量方法，取消了原有的节流孔板，减少了给水系统的节流损失，提高了泵组的经济性。对目前社会倡导的节能减排，具有一定的实际意义。The automatic speed-adjusting feedwater pump simplifies the original control link of the system, improves the accuracy and reliability of the control signal, and cancels the throttling orifice plate, flow speed changer and flow switch, which saves the cost of processing, manufacturing, installation and maintenance. This makes the cost of the device far less than that of the original speed-regulating feed water pump; the flow measurement method of the device cancels the original throttling orifice, reduces the throttling loss of the water supply system, and improves the economy of the pump set. It has certain practical significance to the energy saving and emission reduction advocated by the society at present.
该自动调速给水泵提高了泵组的经济型和安全性、提高运行操作的方便性；可以作为产品生产，效益可观。The automatic speed-regulating feedwater pump improves the economy and safety of the pump set, and improves the convenience of operation; it can be produced as a product, and the benefit is considerable.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102032162A (en) * | 2010-10-21 | 2011-04-27 | 中广核工程有限公司 | Digital speed regulation system and method for nuclear power station feed pump |
| CN101787969B (en) * | 2009-09-04 | 2013-03-27 | 东北电力科学研究院有限公司 | Numerical control system of minimum flow valve of governing feedwater pump and minimum flow control method thereof |
| CN105756879A (en) * | 2016-03-24 | 2016-07-13 | 台州市百施度工贸有限公司 | Intelligent quantitative slurry pump |
| CN111594460A (en) * | 2020-06-12 | 2020-08-28 | 国网黑龙江省电力有限公司电力科学研究院 | Minimum flow control system of water feeding pump |
-
2009
- 2009-06-11 CN CN200920014501XU patent/CN201560920U/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101787969B (en) * | 2009-09-04 | 2013-03-27 | 东北电力科学研究院有限公司 | Numerical control system of minimum flow valve of governing feedwater pump and minimum flow control method thereof |
| CN102032162A (en) * | 2010-10-21 | 2011-04-27 | 中广核工程有限公司 | Digital speed regulation system and method for nuclear power station feed pump |
| CN105756879A (en) * | 2016-03-24 | 2016-07-13 | 台州市百施度工贸有限公司 | Intelligent quantitative slurry pump |
| CN111594460A (en) * | 2020-06-12 | 2020-08-28 | 国网黑龙江省电力有限公司电力科学研究院 | Minimum flow control system of water feeding pump |
| CN111594460B (en) * | 2020-06-12 | 2022-04-15 | 国网黑龙江省电力有限公司电力科学研究院 | Minimum flow control system of water feeding pump |
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