CN203799278U - Water filling valve position control system for large-scale thermal power unit auxiliary equipment cooling water system - Google Patents

Abstract

The utility model provides a water filling valve position control system for a large-scale thermal power unit auxiliary equipment cooling water system. Switching value delay modules, an analog quantity delay module, AND modules, a pulse model, an RS trigger module, a subtraction module, a high-value monitoring module and a switching value switching module in a distributed control system are adopted to build a water filling valve position control real-time online optimizer, the existing water filling control system in the auxiliary equipment cooling water system is intervened, and an independent water filling valve position control system is formed. Thus, technical problems that misoperation of a liquid level switch during the water filling process of the prior control system is solved, dropping of the pressure at the inlet of the cooling water is too fast and the like can be solved, and the water filling work efficiency of the auxiliary equipment cooling water system is improved.

Description

A kind of large electric power plant set auxiliary machinery cooling water system filling valve level controlling system

Technical field

The utility model relates to automatic control system, is specifically related to a kind of large electric power plant set auxiliary machinery cooling water system filling valve level controlling system.

Background technology

The object of water-filling control system is according to the needs of subsidiary engine cooling system operation, and each cooling sector is carried out to corresponding water-filling.Each cooling sector is integrated relevant cooling triangle element and corresponding water inlet pipe, rising pipe and tapping pipe thereof, and their walk abreast and arrange and work alone, and therefore have 4 same water-fillings to control the water-filling control system of cooling sector.

Program is closed transfer pump drain-side motorized valve and spilling water valve and is opened transfer pump water-filling side motorized valve by steering logic, start 1 operation transfer pump, close cooling sector draw-off valve and cooling sector Inlet and outlet water communicating valve, crawl is controlled and is opened cooling sector water intaking valve and cooling sector outlet valve, and all opens cooling sector and rush nitrogen inlet valve.After waiting for the about 8min of cooling sector water-filling, if cooling sector gas exhaust duct level switch is closed, and expansion tank is that ordinary water level stops 1 and moves transfer pump, closes transfer pump water-filling side motorized valve and cooling sector and rushes nitrogen inlet valve.

But in actual water filling process, liquid fluctuating can make level switch mistake send out; Secondly, in water filling process, the inlet/outlet valve too fast meeting of opening the door makes cooling water inlet pressure drop too fast, causes water circulating pump outlet decompression.

Utility model content

(1) technical matters solving

For the deficiencies in the prior art, the utility model provides a kind of filling valve level controlling system of large electric power plant set auxiliary machinery cooling water system, can solve level switch mistake in existing control system water filling process and send out, the problem that cooling water inlet pressure drop is too fast.

(2) technical scheme

In order to reach above object, the utility model is achieved by the following technical programs:

A filling valve level controlling system for large electric power plant set auxiliary machinery cooling water system, this system comprises: first reports module, switching value selection module, analog quantity time delay module, subtraction block, pulse module or module and rest-set flip-flop module with module, second with module, the first high report module, the second high report module, third high report module, the first switching value time delay module, second switch amount time delay module, height;

Wherein, open the instruction input first of cooling sector water intaking valve or outlet valve and the first input end of module, the input end of the high report module of valve position signal input first, the output terminal of the first high report module is connected with the second input end of module with first, and first is connected with the first input end of rest-set flip-flop module with the output terminal of module, level switch signal is inputted the input end of the first switch time delay module and second switch time delay module simultaneously, the output terminal of the first switch time delay module selects the first input end of module to be connected with switch, the output terminal of second switch time delay module selects the second input end of module to be connected with switch, valve position signal input height is reported the input end of module, the output terminal that height is reported module selects the 3rd input end of module to be connected with switch, the output terminal of switch selection module with or the first input end of module be connected, the input end of pressure signal while input analog amount time delay module and the second input end of subtraction block, the output terminal of analog quantity time delay module is connected with the first input end of subtraction block, the output terminal of subtraction block is connected with the input end of the second high report module, the output terminal of the second high report module is connected with the first input end of module with second, the input end of valve position signal input third high report module, the output terminal of third high report module is connected with the second input end of module with second, second is connected with the output terminal of module and the input end of pulse module, the output terminal of pulse module with or the second input end of module be connected, or the output terminal of module is connected with the second input end of rest-set flip-flop module, the output terminal of rest-set flip-flop module is connected with valve switch.

Preferably, described valve position signal is produced by valve position transmitter, and described pressure signal is produced by pressure unit.

(3) beneficial effect

The utility model has following beneficial effect at least:

The utility model provides a kind of large electric power plant set auxiliary machinery cooling water system filling valve level controlling system, by utilize rest-set flip-flop module etc. to be built into filling valve level controlling system real-time online optimizer to the judgement of cooling water pressure force signal, the high lower bound of valve position signal, realize subsidiary engine cooling water system water-filling control of valve position, having solved liquid level exploitation mistake in existing water-filling control system water filling process sends out, the problems such as cooling water inlet pressure drop, and improved subsidiary engine cooling water system water-filling work efficiency.

Accompanying drawing explanation

In order to be illustrated more clearly in the utility model embodiment or technical scheme of the prior art, to the accompanying drawing of required use in embodiment or description of the Prior Art be briefly described below, apparently, accompanying drawing in the following describes is only embodiment more of the present utility model, for those of ordinary skills, do not paying under the prerequisite of creative work, can also obtain according to these figure other accompanying drawing.

Fig. 1 is the structural representation of a kind of large electric power plant set auxiliary machinery cooling water system filling valve level controlling system of the utility model embodiment.

Embodiment

Below in conjunction with the accompanying drawing in the utility model embodiment, the technical scheme in the utility model embodiment is clearly and completely described, obviously, described embodiment is only the utility model part embodiment, rather than whole embodiment.Embodiment based in the utility model, those of ordinary skills are not making the every other embodiment obtaining under creative work prerequisite, all belong to the scope of the utility model protection.

As shown in Figure 1, the filling valve level controlling system of a kind of large electric power plant set auxiliary machinery cooling water system that the utility model embodiment provides, this system comprises: first reports module M8, switching value selection module M6, analog quantity time delay module M9, subtraction block M10, pulse module M13 or module M7 and rest-set flip-flop module M2 with module M1, second with module M12, the first high report module M3, the second high report module M11, third high report module M14, the first switching value time delay module M4, second switch amount time delay module M5, height.

Wherein, open the instruction input first of cooling sector water intaking valve or outlet valve and the first input end of module M1, the input end of the high report module of valve position signal input first M3, the output terminal of the first high report module M3 is connected with the second input end of module M1 with first, and first is connected with the first input end of rest-set flip-flop module M2 with the output terminal of module M1, level switch signal is inputted the input end of the first switch time delay module M4 and second switch time delay module M5 simultaneously, the output terminal of the first switch time delay module M4 selects the first input end of module M6 to be connected with switch, the output terminal of second switch time delay module M5 selects the second input end of module M6 to be connected with switch, valve position signal input height is reported the input end of module M8, height reports the output terminal of module M8 to select the 3rd input end of module M6 to be connected with switch, the output terminal that switch is selected module M6 with or the first input end of module M7 be connected, the input end of pressure signal while input analog amount time delay module M9 and the second input end of subtraction block M10, the output terminal of analog quantity time delay module M9 is connected with the first input end of subtraction block M10, the output terminal of subtraction block M10 is connected with the input end of the second high report module M11, the output terminal of the second high report module M11 is connected with the first input end of module M12 with second, the input end of valve position signal input third high report module M14, the output terminal of third high report module M14 is connected with the second input end of module M12 with second, second is connected with the input end of pulse module M13 with the output terminal of module M12, the output terminal of pulse module M13 with or the second input end of module M7 be connected, or the output terminal of module M7 is connected with the second input end of rest-set flip-flop module M2.

Wherein, described valve position signal is produced by valve position transmitter, and described pressure signal is produced by pressure unit.

In this system, valve position signal ZT sends into respectively the first high report module M3, height is reported module M8 and third high report module M14, thereby carried out the judgement of the high lower bound of valve position signal with the threshold value comparison setting; Level switch signal LT is by accessing after the first switching value time delay module M4 and second switch amount time delay module M5, and input switch amount selector switch M6, can solve the problem that in water filling process, liquid level exploitation mistake is sent out; And access subtraction block M10 after pressure signal P T access analog quantity time delay module M9, and further subtract each other output with pressure signal P T, make by the judgement to cooling water pressure force signal, thus the problem of solution cooling water inlet pressure drop.

The utility model embodiment provides a kind of large electric power plant set auxiliary machinery cooling water system filling valve level controlling system, by to the judgement of cooling water pressure force signal, the high lower bound of valve position signal and utilize rest-set flip-flop module etc. to be built into filling valve level controlling system real-time online optimizer, get involved in the existing water-filling control system of subsidiary engine cooling water system, form an independently filling valve level controlling system, having solved liquid level exploitation mistake in existing water-filling control system water filling process sends out, the problems such as cooling water inlet pressure drop, and improved subsidiary engine cooling water system water-filling work efficiency.

Above embodiment only, in order to the technical solution of the utility model to be described, is not intended to limit; Although the utility model is had been described in detail with reference to previous embodiment, those of ordinary skill in the art is to be understood that; Its technical scheme that still can record aforementioned each embodiment is modified, or part technical characterictic is wherein equal to replacement; And these modifications or replacement do not make the essence of appropriate technical solution depart from the spirit and scope of each embodiment technical scheme of the utility model.

Claims (2)

1. the filling valve level controlling system of a large electric power plant set auxiliary machinery cooling water system, it is characterized in that, this system comprises: first reports module, switching value selection module, analog quantity time delay module, subtraction block, pulse module or module and rest-set flip-flop module with module, second with module, the first high report module, the second high report module, third high report module, the first switching value time delay module, second switch amount time delay module, height;

Wherein, open the instruction input first of cooling sector water intaking valve or outlet valve and the first input end of module, the input end of the high report module of valve position signal input first, the output terminal of the first high report module is connected with the second input end of module with first, and first is connected with the first input end of rest-set flip-flop module with the output terminal of module, level switch signal is inputted the input end of the first switch time delay module and second switch time delay module simultaneously, the output terminal of the first switch time delay module selects the first input end of module to be connected with switch, the output terminal of second switch time delay module selects the second input end of module to be connected with switch, valve position signal input height is reported the input end of module, the output terminal that height is reported module selects the 3rd input end of module to be connected with switch, the output terminal of switch selection module with or the first input end of module be connected, the input end of pressure signal while input analog amount time delay module and the second input end of subtraction block, the output terminal of analog quantity time delay module is connected with the first input end of subtraction block, the output terminal of subtraction block is connected with the input end of the second high report module, the output terminal of the second high report module is connected with the first input end of module with second, the input end of valve position signal input third high report module, the output terminal of third high report module is connected with the second input end of module with second, second is connected with the output terminal of module and the input end of pulse module, the output terminal of pulse module with or the second input end of module be connected, or the output terminal of module is connected with the second input end of rest-set flip-flop module, the output terminal of rest-set flip-flop module is connected with valve switch.

2. system according to claim 1, is characterized in that, described valve position signal is produced by valve position transmitter, and described pressure signal is produced by pressure unit.