阅读说明：本技术 一种汽轮机润滑油温度调节阀控制装置及方法 (Steam turbine lubricating oil temperature regulating valve control device and method ) 是由 李海涛 肖付伟 阎文琳 孙俊 吴松林 陈湛杨 肖彦梅 杨雅寒 高鑫浩 于 2020-12-02 设计创作，主要内容包括：本发明提供了一种汽轮机润滑油温度调节阀控制装置,包括选择器、阈值比较器、或非门、PID模块、与门和函数转换器。阈值比较器分别和选择器、或非门连接。选择器依次和PID模块、函数转换器、与门连接。其中选择器为三通道,包括通道一、通道二和通道三。阈值比较器的输出端分别和选择器通道一的输入端、通道三的输入端,以及或非门的输入端连接。或非门的输出端和选择器通道二的输入端连接。本发明还提供了一种汽轮机润滑油温度调节阀控制方法。本发明的技术方案能够使阀门避免温度扰动或阀门超调影响,使核电机组在冬季运行期间避免出现阀门波动问题。(The invention provides a control device for a turbine lubricating oil temperature regulating valve, which comprises a selector, a threshold comparator, a NOR gate, a PID module, an AND gate and a function converter. The threshold comparator is respectively connected with the selector and the NOR gate. The selector is connected with the PID module, the function converter and the AND gate in sequence. The selector is three channels including a channel I, a channel II and a channel III. The output end of the threshold comparator is respectively connected with the input end of the first channel of the selector, the input end of the third channel of the selector and the input end of the NOR gate. And the output end of the NOR gate is connected with the input end of the second selector channel. The invention also provides a control method of the turbine lubricating oil temperature regulating valve. According to the technical scheme, the valve can avoid the influence of temperature disturbance or overshoot of the valve, and the problem of valve fluctuation of the nuclear power unit during operation in winter is avoided.)

1. A turbine lubricating oil temperature regulating valve control device receives a lubricating oil temperature display value and a blank signal, and is characterized in that: the device comprises a selector (4), a threshold comparator (6), a NOR gate (7), a PID module (8), an AND gate (9) and a function converter (10); the threshold comparator (6) is respectively connected with the selector (4) and the NOR gate (7); the selector (4) is connected with the PID module (8), the function converter (10) and the AND gate (9) in sequence.

2. The turbine lubricant temperature regulator valve control apparatus of claim 1, wherein: the selector (4) is three channels and comprises a channel I (1), a channel II (2) and a channel III (3).

3. The turbine lubricant temperature regulator valve control apparatus of claim 2, wherein: the output end of the threshold comparator (6) is respectively connected with the input end of the channel I (1), the input end of the channel III (3) and the input end of the NOR gate (7) of the selector (4); the output end of the NOR gate (7) is connected with the input end of the channel two (2) of the selector (4).

4. The turbine lubricant temperature regulator valve control apparatus of claim 3, wherein: a lubricant oil temperature display value (GGR102MT) is inputted to a selector (4) and a threshold comparator (6), respectively.

5. The turbine lubricant temperature regulator valve control apparatus of claim 4, wherein: the turbine lubricating oil temperature regulating valve control device is also provided with a manual and automatic switching device (5); the output ends of the first channel (1) and the third channel (3) of the selector (4) are respectively connected with a PID module (8), a manual-automatic switching device (5) and a function converter (10) in sequence.

6. The turbine lubricant temperature regulator valve control apparatus of claim 5, wherein: the control device of the turbine lubricating oil temperature regulating valve is also provided with a NOT gate (11), and the two function converters (10) respectively input a blank signal after being negated by the NOT gate (11) into an AND gate (9) and then output a signal; the blank signal is a failure signal of the lubricating oil temperature display value (GGR102 MT).

7. The turbine lubricant temperature regulator valve control apparatus of claim 6, wherein: and gate (9) corresponding to the output end of channel one (1) of selector (4) outputs valve closing signal (CMD close).

8. The steam turbine lubricating oil temperature regulator valve control apparatus of claim 7, wherein: and gate (9) corresponding to the output end of channel three (3) of selector (4) outputs valve open signal (CMD open).

9. The turbine lubricant temperature regulator valve control apparatus of claim 8, wherein: the conversion function of the function converter (10) is f (x) ═ x, where x is the difference between the displayed value of the temperature of the lubricating oil and the threshold temperature, which is 45 ℃.

10. A turbine lubricant temperature regulating valve control method using the turbine lubricant temperature regulating valve control apparatus according to claim 9, characterized in that: the method comprises the following steps:

the method comprises the following steps: the temperature display value (GGR102MT) of the lubricating oil is respectively input into a selector (4) and a threshold comparator (6);

step two: the threshold comparator (6) and the OR-NOT gate (7) compare and judge the difference value between the lubricating oil temperature display value (GGR102MT) and the threshold temperature, wherein the threshold temperature is 45 ℃:

when the temperature display value (GGR102MT) of the lubricating oil is in the interval of [44 ℃ and 46 ℃, the NOR gate (7) triggers the second channel (2) of the selector (4), and the valve does not act;

when the lubricating oil temperature display value (GGR102MT) is less than 44 ℃, the threshold comparator (6) triggers a channel one (1) of the selector (4); and send to PID module (8), PID module (8) get a final steady deviation after PID calculates, and then carry on the function conversion by the function converter (10), convert into a pulse and close the valve order;

when the temperature display value (GGR102MT) of the lubricating oil is higher than 44 ℃, the threshold comparator (6) triggers the channel III (3) of the selector (4) and sends the channel III to the PID module (8), the PID module (8) obtains a final stable deviation after PID calculation, and the final stable deviation is subjected to function conversion by the function converter (10) and is converted into a pulse valve opening instruction.

Technical Field

The invention belongs to the technical field of instrument control, and particularly relates to a control device and a control method for a turbine lubricating oil temperature regulating valve.

Background

During the operation of the nuclear power unit in winter, the temperature of seawater is low, and disturbance is caused to a temperature regulating valve of a lubricating oil of a turbine. The control mode of the existing turbine lubricating oil temperature regulating valve is as follows, firstly, when the temperature of the lubricating oil is between 44 ℃ and 46 ℃, the temperature regulating valve does not act; secondly, when the temperature of the lubricating oil is lower than 44 ℃, the temperature regulating valve receives an off command action; and thirdly, when the temperature of the lubricating oil is higher than 46 ℃, the temperature regulating valve receives an opening command action. In this control mode, when the valve is in a small opening (about 5%) control mode, the valve closing adjustment is too early, and the valve opening adjustment is too late. When the temperature of the lubricating oil changes, the valve is always in fluctuation regulation. Because the oil temperature and the valve are in closed-loop regulation control, the valve fluctuation further causes continuous fluctuation of the oil temperature, and the valve fluctuation easily causes the valve out of control, so that the temperature of the lubricating oil is increased or reduced, and the stable operation of the steam turbine is influenced.

In addition, the existing valve control mode has no alarm logic. When the temperature regulating valve of the turbine lubricating oil fluctuates, no relevant alarm is given to remind an operator to pay attention to and make a response, and a monitoring leak exists.

Based on the above problems, there is an urgent need to design an improved valve control method for a temperature control valve of lubricating oil.

Disclosure of Invention

The invention mainly aims to provide a device and a method for controlling a turbine lubricating oil temperature regulating valve, which can realize the stability of valve control during normal operation and improve the safety and the economical efficiency of the operation of a nuclear power unit.

The technical scheme adopted by the invention is as follows:

a control device for the lubricating oil temperature regulating valve of a steam turbine receives a lubricating oil temperature display value and a blank signal and comprises a selector, a threshold comparator, a NOR gate, a PID module, an AND gate and a function converter. The threshold comparator is respectively connected with the selector and the NOR gate. The selector is connected with the PID module, the function converter and the AND gate in sequence.

The selector is three channels including a channel I, a channel II and a channel III.

The output end of the threshold comparator is respectively connected with the input end of the first channel of the selector, the input end of the third channel of the selector and the input end of the NOR gate. And the output end of the NOR gate is connected with the input end of the second selector channel.

The indicated value of the temperature of the lubricating oil is respectively input into a selector and a threshold comparator.

The turbine lubricating oil temperature regulating valve control device is also provided with a manual and automatic switching device.

And the output ends of the first channel and the third channel of the selector are respectively connected with a PID module, a manual-automatic switching device and a function converter in sequence.

The turbine lubricating oil temperature regulating valve control device is also provided with a NOT gate.

The two function converters respectively input a blank signal which is not selected by the NOT gate into an AND gate and then output signals.

The blank signal is a fault signal of the temperature display value of the lubricating oil, namely a non-display signal.

And the AND gate corresponding to the output end of the first selector channel outputs a valve closing signal.

And the AND gate corresponding to the output end of the selector channel III outputs a valve opening signal.

The transfer function of the function converter is f (x) x, where x is the difference between the displayed value of the temperature of the lubricating oil and the threshold temperature, which is 45 ℃.

The invention also provides a turbine lubricating oil temperature regulating valve control method using the turbine lubricating oil temperature regulating valve control device, which comprises the following steps:

the method comprises the following steps: the temperature display value of the lubricating oil is respectively input into the selector and the threshold comparator;

step two: and comparing and judging the difference between the temperature display value of the lubricating oil and a threshold temperature by a threshold comparator and a NOR gate, wherein the threshold temperature is 45 ℃:

when the temperature display value of the lubricating oil is in the interval of [44 ℃ and 46 ℃, the NOR gate triggers a channel II of the selector, and the valve does not act;

when the temperature display value of the lubricating oil is less than 44 ℃, the threshold comparator triggers a channel I of the selector; and send to PID module, get a final steady deviation after PID calculates, and then carry on the function conversion by the function converter, turn into a pulse to close the valve order;

when the temperature display value of the lubricating oil is larger than 44 ℃, the threshold comparator triggers a channel III of the selector and sends the channel III to the PID module, a final stable deviation is obtained after PID calculation, and then the function converter performs function conversion to convert the final stable deviation into a pulse valve opening instruction.

The beneficial effects obtained by the invention are as follows:

the control mode of the original lubricating oil temperature regulating valve is changed, so that the valve is prevented from being influenced by temperature disturbance or overshoot, and the problem of valve fluctuation is avoided during the running of the unit in winter; the risk of out-of-control valve and out-of-control steam turbine lubricating oil temperature caused by valve fluctuation is reduced, and further the risk of damage and shutdown of steam turbine equipment is reduced.

Drawings

FIG. 1 is a logic diagram of a turbine lube oil temperature regulator control method;

wherein: 1 is a channel I; 2 is a channel II; 3 is a channel III; 4 is a selector; 5 is a manual automatic switching device; 6 is a threshold comparator; 7 is a NOR gate; 8 is a PID module; 9 is an AND gate; 10 is a function converter; 11 is a NOT gate; SP is a threshold temperature; GGR102MT is a lubricating oil temperature display value; the valve closing signal is CMD close; the valve open signal is CMD open.

Detailed Description

The invention is described in detail below with reference to the figures and specific embodiments.

As shown in FIG. 1, the invention provides a turbine lubricating oil temperature regulating valve control device, which comprises a selector 4, a threshold comparator 6, a NOR gate 7, a PID module 8, an AND gate 9 and a function converter 10. The threshold comparator 6 is connected to the selector 4 and the nor gate 7, respectively. The selector 4 is connected with a PID module 8, a function converter 10 and an AND gate 9 in sequence.

The selector 4 is three channels including a channel one 1, a channel two 2 and a channel three 3.

The output of threshold comparator 6 is connected to the input of selector 4 channel one 1, the input of channel three 3, and the input of nor gate 7, respectively. The output of nor gate 7 is connected to the input of channel two 2 of selector 4.

The lube oil temperature display value GGR102MT is input to the selector 4 and the threshold comparator 6, respectively.

The turbine lubricating oil temperature regulating valve control device is also provided with a manual and automatic switching device 5.

The output ends of the first channel 1 and the third channel 3 of the selector 4 are respectively connected with a PID module 8, a manual-automatic switching device 5 and a function converter 10 in sequence.

The control device of the turbine lubricating oil temperature regulating valve is also provided with a NOT gate 11.

The two function converters 10 respectively output signals after inputting a blank signal which is negated by a NOT gate 11 and an AND gate 9.

The blank signal is a fault signal of the lubricating oil temperature display value GGR102MT, namely a non-display signal.

The and gate 9 corresponding to the output of channel one 1 of the selector 4 outputs a valve-off signal CMD close.

The output of the selector 4, channel three 3, corresponds to the output of the and gate 9, which outputs the valve open signal CMD open.

The conversion function of the function converter 10 is f (x) ═ x, where x is the difference between the displayed value of the temperature of the lubricating oil and the threshold temperature SP of 45 ℃.

The invention also provides a turbine lubricating oil temperature regulating valve control method using the turbine lubricating oil temperature regulating valve control device, which comprises the following steps:

the method comprises the following steps: the lubricating oil temperature display value GGR102MT is respectively input into the selector 4 and the threshold comparator 6;

step two: the threshold comparator 6 and the nor gate 7 compare and judge the difference value between the temperature display value GGR102MT of the lubricating oil and the threshold temperature, wherein the threshold temperature is 45 ℃:

when the temperature display value GGR102MT of the lubricating oil is in the interval of [44 ℃,46 ℃, the NOR gate 7 triggers the second channel 2 of the selector 4, and the valve does not act;

when the displayed value of the temperature of the lubricating oil GGR102MT is less than 44 ℃, the threshold comparator 6 triggers channel one 1 of the selector 4; and send to PID module 8, get a final steady deviation after PID calculates, and then carry on the function conversion by the function converter, turn into a pulse to close the valve order;

when the temperature display value GGR102MT of the lubricating oil is higher than 44 ℃, the threshold comparator 6 triggers the channel three 3 of the selector 4 and sends the channel three 3 to the PID module 8, the PID module 8 obtains a final stable deviation after PID calculation, and the final stable deviation is subjected to function conversion by the function converter and is converted into a pulse valve opening instruction.

The beneficial effects obtained by the invention are as follows:

the control mode of the original lubricating oil temperature regulating valve is changed, so that the valve is prevented from being influenced by temperature disturbance or overshoot, and the problem of valve fluctuation is avoided during the running of the unit in winter; the risk of out-of-control valve and out-of-control steam turbine lubricating oil temperature caused by valve fluctuation is reduced, and further the risk of damage and shutdown of steam turbine equipment is reduced.