CN220381492U - Control system of variable-rate pump recirculation regulating valve with unidirectional locking function - Google Patents
Control system of variable-rate pump recirculation regulating valve with unidirectional locking function Download PDFInfo
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Abstract
The utility model provides a control system of a variable-rate pump recirculation regulating valve with unidirectional locking, which comprises a valve opening judging module, a rate limiting module, an analog switching selecting module, an analog manual operator module, a limiting module and a logic or module.
Description
Technical Field
The application belongs to the technical field of automatic control of coal-fired generating sets, and particularly relates to a control system of a variable-rate pump recirculation regulating valve with unidirectional locking.
Background
Due to the rapid development of new energy power generation and surplus coal-electricity capacity in China, large-scale participation of coal-fired units in deep peak shaving has become a development trend. The feed water flow rate is lower in the deep peak regulation period of the unit, so that the feed water pump is ensured to safely operate, the feed water flow rate of the boiler is safely and controllably controlled, and the rotating speed of the steam pump has enough regulating allowance, the recirculation regulating valve of the feed water pump is required to be gradually opened, and the stable control of the recirculation regulating valve of the steam pump is very important.
At present, most of the control modes of the recirculation of the steam pump of the once-through boiler unit in China adopt open-loop control of a flow curve hysteresis function or closed-loop control of P ID regulation, and the control functions have limitations, when the water supply flow is reduced to the point that the recirculation valve needs to be opened, if the opening rate and the amplitude of the recirculation valve are incorrectly mastered, the recirculation valve causes disturbance to the inlet flow of the steam pump, so that the recirculation valve is switched back and forth, and then the regulation of a water supply instruction is added, so that the water supply flow of the boiler is easily fluctuated greatly, the safe operation of the unit is seriously threatened, wherein the adjustment of parameters such as a hysteresis value, a curve slope, a valve action rate and the like among the hysteresis function control valve switch curves is also easy to cause the mutual influence between the opening and the flow, and oscillation is generated; when the PHD control is adopted, the phenomenon of flow overshoot or slow regulation can be generated by the fixed parameters under different working conditions, and the safety operation requirement of the unit can not be met. The two control modes can have the problems that the recirculation regulating valve of the steam pump is in small opening degree regulation for a long time during low-load operation, so that the valve body is damaged at the small opening degree position due to flushing of the water supply flow.
The unit load continuously changes in the peak regulation process, the recirculation valve must maintain proper opening in real time while the boiler feed water flow changes to ensure the safe and controllable operation of the steam pump, the strategy of simply adopting single-loop PID control or hysteresis function control cannot ensure the safe operation of the unit, the non-stop accident of the unit caused by improper control action of the steam pump recirculation regulating valve occurs, in order to prevent unsafe factors caused by frequent actions when the recirculation valve is automatically controlled, operators can only adopt manual control, which is very unfavorable for the safety of a water supply system in the deep regulation stage of the unit, and therefore, the control quality of the steam pump recirculation regulating valve becomes an important measure for ensuring the deep peak regulation operation safety of the unit.
Disclosure of Invention
The utility model aims to provide a control system of a variable-rate pump recirculation regulating valve with unidirectional locking, which solves the defect of poor safety of the control method of the existing pump recirculation regulating valve.
In order to achieve the above purpose, the utility model adopts the following technical scheme:
the utility model provides a control system of a variable-rate pump recirculation regulating valve with unidirectional locking, which comprises a valve regulating opening judging module, a rate limiting module, an analog switching selecting module, an analog manual operator module, a limiting module and a logic or module, wherein the valve regulating opening judging module is provided with an analog input pump inlet flow input end and an analog input main water supply flow input end, and the output end of the valve regulating opening judging module is connected with the input end of the rate limiting module;
the output end of the rate limiting module is connected with the analog quantity manual operator module through the analog quantity switching selection module;
the limiting module is provided with an analog quantity input steam pump inlet flow input end, and the output end of the limiting module is connected with the input end of the logic OR module;
the logic or module is provided with a tripping input end of the switching value input small machine and a bad quality input end of the switching value input steam pump inlet flow, and the output end of the logic or module is connected with the analog quantity manual operator module;
the analog manual operator module is provided with an analog input steam pump recirculation valve position feedback input end, and the output end of the analog manual operator module is respectively connected with an analog output steam pump recirculation valve given instruction and an analog switching selection module.
Preferably, the valve opening judging module comprises a first valve opening judging module, a second valve opening judging module and a third valve opening judging module, wherein the first valve opening judging module and the second valve opening judging module are respectively provided with an analog quantity input steam pump inlet flow input end, and the output ends of the first valve opening judging module, the second valve opening judging module and the third valve opening judging module are connected with the input end of the speed limiting module.
Preferably, a lead-lag module is arranged between the input ends of the first valve opening judging module and the second valve opening judging module and the input end of the analog input steam pump inlet flow.
Preferably, the output end of the first valve opening judging module is connected with an input end X1 of the big taking module, the output end of the second valve opening judging module is connected with an input end X2 of the small taking module, the output end of the big taking module is connected with the input end X1 of the small taking module, the output end of the small taking module is respectively connected with the input end X2 of the big taking module and the input end of the third valve opening judging module, and the output end of the third valve opening judging module is connected with the input end of the speed limiting module.
Preferably, the valve opening judging module comprises a fourth valve opening judging module and a fifth valve opening judging module, wherein the fourth valve opening judging module and the fifth valve opening judging module are both provided with an analog input main feed water flow input end, the output end of the fourth valve opening judging module is connected with the speed increasing rate limit end of the speed limiting module, and the output end of the fifth valve opening judging module is connected with the speed reducing rate limit end of the speed limiting module.
Preferably, the logic or module comprises a first logic or module and a second logic or module, wherein the low-limit output end of the amplitude limiting module is connected with the input end of the first logic or module;
the small machine tripping output end of the switching value input module is respectively connected with the input end of the first logic OR module and the input end of the pulse output module, and the output end of the first logic OR module is connected with the tracking switch end of the analog quantity manual operator module;
the output end of the pulse output module is connected with the input end X1 of the second logic or module, the bad mass of the flow of the inlet flow of the switching value input steam pump is connected with the input end X2 of the second logic or module, and the output end of the second logic or module is connected with the cut-off hand switch of the analog quantity manual operator module.
Preferably, the output end of the analog quantity manual operator module is respectively connected with the input end X2 of the analog quantity switching selection module and a given instruction of the analog quantity output steam pump recirculation valve, and the manual state display end of the analog quantity manual operator module is respectively connected with the selection signal end of the analog quantity switching selection module and the manual mode end of the switching quantity steam pump recirculation valve.
Compared with the prior art, the utility model has the beneficial effects that:
the utility model provides a control system of a variable-rate pump recirculation regulating valve with unidirectional locking, which is characterized in that a lead-lag module, a valve opening judging module, a big taking module, a small taking module, a speed limiting module, an analog quantity switching and selecting module, a limiting module, a logic or module, a pulse output module, an analog quantity manual operator module and the like are used for matching, so that the speed of valve regulation is determined according to the water supply flow under different load working conditions, the rotating speed regulating characteristic of the pump can be better matched, a series of problems of water supply flow sudden drop, water-coal ratio imbalance, overheat rise and the like caused by the too high regulating speed are avoided, the quick recovery capacity of a boiler in the water supply disturbance process is increased, and the running safety of a unit is improved.
Meanwhile, the valve adjusting opening judging module can prevent the reverse direction callback of the valve adjusting caused by the fluctuation of the water supply flow in the adjusting process, and plays a role in unidirectional locking in the opening and closing process. Can prevent the water supply flow from greatly fluctuating due to the adjustment oscillation caused by repeated switching, and reduce the occurrence of non-stop accidents. The minimum opening limiting function of the recirculation valve of the steam pump is added, so that the scouring damage of the water supply flow to the recirculation valve can be effectively avoided, and the reliability of equipment is ensured. The adjusting quality of the recirculation valve of the steam pump is improved, the stable control of the boiler water supply flow under the low-load working condition is ensured, and the deep peak regulation operation safety of the unit is ensured.
Drawings
Fig. 1 is a schematic diagram of a system structure according to the present utility model.
Detailed Description
In the following description, for purposes of explanation and not limitation, specific details are set forth, such as particular system configurations, techniques, etc. in order to provide a thorough understanding of the embodiments of the present application. It will be apparent, however, to one skilled in the art that the present application may be practiced in other embodiments that depart from these specific details. In other instances, detailed descriptions of well-known systems, devices, circuits, and methods are omitted so as not to obscure the description of the present application with unnecessary detail.
Example 1
Referring to fig. 1, the control system for a variable-rate pump recirculation regulating valve with unidirectional blocking according to the present embodiment includes a lead-lag module, a valve opening judging module, a big-taking module, a small-taking module, a rate limiting module, an analog switching selection module, a limiting module, a logic or module, a pulse output module, and an analog manual operator module, and specifically includes:
analog quantity input: the inlet flow of the steam pump, the main water supply flow and the position feedback of the recirculation valve of the steam pump;
analog quantity output: giving a command to a pump recirculation valve;
switching value input: small machine tripping and bad quality of inlet flow of the steam pump;
switching value output: manual mode of the pump recirculation valve.
The analog input pump inlet flow is connected with the input end of the lead-lag module, and the lag time constant of the lead-lag module is set to be 5, so that the value of the pump inlet flow lags by 5 seconds, and the change rate of the pump inlet flow is reduced.
The output end of the lead-lag module is respectively connected with the input end of the first valve opening judging module and the input end of the second valve opening judging module, and the purpose of the lead-lag module is to judge the valve opening of the recirculation valve of the pump according to the inlet flow of the pump, in particular:
the inlet flow of the air pump is 0, and the output end of the first valve adjusting opening judging module is 100;
the inlet flow of the air pump is 330, and the output end of the first valve adjusting opening judging module is 100;
the inlet flow of the air pump is 430, and the output end of the first valve adjusting opening judging module is 0;
the inlet flow of the air pump is 1200, and the output end of the first valve opening judging module is 0.
The inlet flow of the air pump is 0, and the output end of the second valve adjusting opening judging module is 0;
the inlet flow of the air pump is 350, and the output end of the second valve adjusting opening judging module is 100;
the inlet flow of the air pump is 450, and the output end of the second valve adjusting opening judging module is 0;
the inlet flow of the air pump is 1200, and the output end of the second valve opening judging module is 0.
The output end of the first valve opening judging module is connected with the input end X1 of the big taking module; the output end of the second valve opening judging module is connected with the input end X2 of the small taking module; the output end of the big taking module is connected with the input end X1 of the small taking module, and the output end of the small taking module is respectively connected with the input end X2 of the big taking module and the input end of the third valve opening judging module, so that the recirculation valve of the steam pump has an initial opening of 20%; the output end of the third valve opening judging module is connected with the input end of the speed limiting module.
The input of the third valve opening judging module is 0, and the third valve opening judging module is 0;
the input of the third valve opening judging module is 0.5, and the third valve opening judging module is 20;
the input of the third valve opening judging module is 20, and the third valve opening judging module is 20;
the input of the third valve opening judging module is 100, and the third valve opening judging module is 100.
The analog input main feed water flow is respectively connected with the input end of a fourth valve opening judging module and the input end of a fifth valve opening judging module, the output end of the fourth valve opening judging module is connected with the speed increasing rate limit value end of the speed limiting module, and the output end of the fifth valve opening judging module is connected with the speed reducing rate limit value end of the speed limiting module, so that the purpose is to judge the switching speed of a pump recirculation valve through the main feed water flow, and prevent the valve from being opened or closed rapidly and cause disturbance to the system.
The input of the fourth valve opening judging module is 0, and the output of the fourth valve opening judging module is 10;
the fourth valve opening judging module has an input of 440 and an output of 10;
the fourth valve opening judging module has an input of 450 and an output of 0;
the input of the fourth valve opening judging module is 600, and the output of the fourth valve opening judging module is 0;
the input of the fourth valve opening judging module is 800, and the output of the fourth valve opening judging module is 0;
the fourth valve opening degree judgment module has an input of 1200 and an output of 0.
The fifth valve opening judging module has an input of 0 and an output of 0.
The fifth valve opening degree judgment module has an input of 450 and an output of 0.
The fifth valve opening degree judgment module has an input of 500 and an output of 0.
The fifth valve opening degree judgment module has an input of 600 and an output of 5.
The fifth valve opening degree judgment module has an input of 800 and an output of 10.
The fifth valve opening degree judgment module has an input of 1200 and an output of 20.
The output end of the rate limiting module is connected with the input X1 end of the analog quantity switching selection module, and the output end of the analog quantity switching selection module is connected with the input end of the analog quantity manual operator module.
The input flow of the analog quantity input steam pump is connected with the input end of the amplitude limiting module, the low limit of the amplitude limiting module is set to 260, and the low limit output end of the amplitude limiting module is connected with the input end X1 of the first logic OR module.
The switching value input small machine tripping operation is respectively connected with the input end X2 of the first logic or module and the input end of the pulse output module, the pulse time is set to be 3, the output end of the first logic or module is connected with the tracking switch end of the analog quantity manual operator module, and the purpose is that the flow of the inlet of the steam pump is less than 260t/h or the steam pump is directly and fully opened when the small machine tripping operation.
The output end of the pulse output module is connected with the input end X1 of the second logic or module, the bad mass of the flow of the inlet flow of the switching value input steam pump is connected with the input end X2 of the second logic or module, and the output end of the second logic or module is connected with the manual switch of the analog manual operator module, so that when the small machine trips or the bad mass of the flow of the inlet flow of the steam pump, the recirculation valve of the steam pump is switched into a manual mode from an automatic mode.
The position feedback of the analog input steam pump recirculation valve is connected with the feedback value end of the analog manual operation device module, the output end of the analog manual operation device module is respectively connected with the input end X2 of the analog switching selection module and the given instruction of the analog output steam pump recirculation valve, and the manual state display end of the analog manual operation device module is respectively connected with the selection signal end of the analog switching selection module and the manual mode end of the switching value steam pump recirculation valve.
The variable rate of the pump recirculation regulating valve, the valve switch in-process unidirectional regulation blocking, the minimum opening limit of the pump recirculation regulating valve and the like are judged through the water supply flow change, a series of problems that the water supply flow in the load reducing process is too fast to drop, the main water supply flow in the regulating process oscillates, the recirculation regulating valve is flushed and damaged under the small flow and the like are effectively prevented, the quick recovery capacity of the boiler in the water supply disturbance process is further improved, the service life of equipment is prolonged, and the safety and stability of a unit are improved.
The above embodiments are only for illustrating the technical solution of the present application, and are not limiting; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present application, and are intended to be included in the scope of the present application.
Claims (7)
1. The control system is characterized by comprising a valve opening judging module, a rate limiting module, an analog switching selection module, an analog manual operator module, a limiting module and a logic or module, wherein the valve opening judging module is provided with an analog input steam pump inlet flow input end and an analog input main water supply flow input end, and the output end of the valve opening judging module is connected with the input end of the rate limiting module;
the output end of the rate limiting module is connected with the analog quantity manual operator module through the analog quantity switching selection module;
the limiting module is provided with an analog quantity input steam pump inlet flow input end, and the output end of the limiting module is connected with the input end of the logic OR module;
the logic or module is provided with a tripping input end of the switching value input small machine and a bad quality input end of the switching value input steam pump inlet flow, and the output end of the logic or module is connected with the analog quantity manual operator module;
the analog manual operator module is provided with an analog input steam pump recirculation valve position feedback input end, and the output end of the analog manual operator module is respectively connected with an analog output steam pump recirculation valve given instruction and an analog switching selection module.
2. The control system of a one-way blocked variable-rate pump recirculation regulating valve according to claim 1, wherein the valve opening judging module comprises a first valve opening judging module, a second valve opening judging module and a third valve opening judging module, wherein the first valve opening judging module and the second valve opening judging module are respectively provided with an analog input pump inlet flow input end, and the output ends of the first valve opening judging module, the second valve opening judging module and the third valve opening judging module are connected with the input end of the rate limiting module.
3. The control system of a one-way blocked variable-rate pump recirculation regulating valve according to claim 2, wherein a lead-lag module is arranged between the input ends of the first regulating valve opening judging module and the second regulating valve opening judging module and the input end of the analog input pump inlet flow.
4. The control system of a variable-rate pump recirculation regulating valve according to claim 2, wherein the output end of the first valve opening judging module is connected with the input end X1 of the big taking module, the output end of the second valve opening judging module is connected with the input end X2 of the small taking module, the output end of the big taking module is connected with the input end X1 of the small taking module, the output end of the small taking module is respectively connected with the input end X2 of the big taking module and the input end of the third valve opening judging module, and the output end of the third valve opening judging module is connected with the input end of the rate limiting module.
5. The control system of a variable-rate pump recirculation regulating valve according to claim 1, wherein the valve opening judging module comprises a fourth valve opening judging module and a fifth valve opening judging module, wherein the fourth valve opening judging module and the fifth valve opening judging module are both provided with an analog input main water supply flow input end, the output end of the fourth valve opening judging module is connected with the speed-increasing rate limit end of the speed limiting module, and the output end of the fifth valve opening judging module is connected with the speed-reducing rate limit end of the speed limiting module.
6. The unidirectional blocking variable rate pump recirculation control valve control system of claim 1, wherein the logic or module comprises a first logic or module and a second logic or module, wherein the low limit output of the clipping module is connected to the input of the first logic or module;
the small machine tripping output end of the switching value input module is respectively connected with the input end of the first logic OR module and the input end of the pulse output module, and the output end of the first logic OR module is connected with the tracking switch end of the analog quantity manual operator module;
the output end of the pulse output module is connected with the input end X1 of the second logic or module, the bad mass of the flow of the inlet flow of the switching value input steam pump is connected with the input end X2 of the second logic or module, and the output end of the second logic or module is connected with the cut-off hand switch of the analog quantity manual operator module.
7. The control system of the variable-rate pump recirculation control valve with unidirectional blocking according to claim 1, wherein the output end of the analog manual operator module is respectively connected with the input end X2 of the analog switching selection module and the given instruction of the analog output pump recirculation valve, and the manual state display end of the analog manual operator module is respectively connected with the selection signal end of the analog switching selection module and the manual mode end of the switching variable pump recirculation valve.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322325737.8U CN220381492U (en) | 2023-08-28 | 2023-08-28 | Control system of variable-rate pump recirculation regulating valve with unidirectional locking function |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202322325737.8U CN220381492U (en) | 2023-08-28 | 2023-08-28 | Control system of variable-rate pump recirculation regulating valve with unidirectional locking function |
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| CN220381492U true CN220381492U (en) | 2024-01-23 |
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| CN202322325737.8U Active CN220381492U (en) | 2023-08-28 | 2023-08-28 | Control system of variable-rate pump recirculation regulating valve with unidirectional locking function |
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