Accurate method for stabilizing voltage in a kind of hydraulic dynamometer circulating water supply system
The present invention relates to gas turbine application field, accurate method for stabilizing voltage in a kind of hydraulic dynamometer circulating water supply system is provided especially.
Hydraulic dynamometer is more and more in the application of gas turbine field, it is gas turbine output shaft power-measuring device, the accuracy of power measurement, pulse closely related with hydraulic dynamometer periodical feeding pressure and pressure of supply water, in circulating water supply system, any pulsation of pressure of supply water all can cause the fluctuation of moment of torsion, thus affect Accuracy of Power Measurement, and therefore for ensureing gas turbine output shaft power measurement accuracy, must to the accurate voltage stabilizing of periodical feeding pressure.
For miniwatt hydraulic dynamometer, some applying units are by special geographical environment, water system is built on mountain, pressure of supply water and voltage stabilizing lean against on mountain and build elevated tank to ensure, and for the use of high-power hydraulic dynamometer in plains region, hydraulic dynamometer periodical feeding voltage stabilizing problem is difficult to solve, annoying each applying unit always, by the research to circulating water supply system voltage stabilizing problem, solve periodical feeding voltage stabilizing problem, guarantee that combustion engine output shaft power Measurement accuracy is significant.
Current similar water system adopts pressure release holding valve to get rid of larger pressure surge in water supply, tentatively sets up system pressure, and the accurate voltage stabilizing of system realizes for machine feed water inlet hydraulic pressure by accurately controlling to be arranged in main line to survey to waterpower in Emergency water supply tank.
Emergency water supply tank is provided with liquid level sensor, pressure transducer, compressed air interface, the devices such as discharge opening, and discharge opening is connected with two motorized valves in parallel, and compressed air interface is connected with pressurized air air supply system.
Steady pressure of system mainly realizes by controlling hydraulic dynamometer feed water inlet hydraulic pressure in tank, and its with water level in tank and tank top compression air pressure closely related, just must accurately water level and tank top compression air pressure in control tank for realizing accurate voltage stabilizing.Emergency water supply tank is arranged in system superintendent road, when water system normally works, large water gaging from tank feed water inlet, water delivering orifice flow into, flow out, water-level fluctuation in tank certainly will be caused, therefore on tank, liquid level sensor is housed, according to liquid level sensor signal, control two, discharge opening exit motorized valve aperture, realize Liquid level.When water system normally works, the compressed air system be connected with tank must be in holding state, when tank top compression air pressure reduces, in compressed air system, in gas-holder, gas flows in water pot, now compressed air system air compressor machine work, to gas-holder tonifying Qi, when water pot top compression air pressure raises, water pot top vent valve opens exhaust automatically, keeps water pot top compression air pressure constant.
Be not difficult to find out, current method for stabilizing voltage design is complicated, and need controling parameters too much, investment is large, in actual applications, debugs very difficult, is difficult to the accurate voltage stabilizing realizing water system.
Summary of the invention
The present invention, according to the requirement of hydraulic dynamometer periodical feeding, provides accurate method for stabilizing voltage in a kind of water system, and the method can solve water-supply voltage-stabilizing problem on the basis of simplification water system, by pressure of supply water ripple control at ± 0.14kgf/cm
2in, ensure that gas turbine output shaft power Measurement accuracy.
The present invention specifically provides accurate method for stabilizing voltage in a kind of hydraulic dynamometer circulating water supply system, it is characterized in that: in described hydraulic dynamometer circulating water supply system, pressure release holding valve is installed and tentatively sets up system pressure, and full bellows water tank is installed in system bypass, wherein pressure release holding valve is diaphragm pressure variable valve.
Accurate method for stabilizing voltage of the present invention mainly relies on pressure release holding valve and full bellows water tank to realize.
The pressure release holding valve selected in system is diaphragm pressure variable valve, from pressure release holding valve upstream, downstream pipe draw pressure guiding pipe enter pressure release holding valve diaphragm epicoele, cavity of resorption, rely on diaphragm epicoele, cavity of resorption pressure reduction autocontrol valve aperture, thus constant pressure before operation valve.This valve is without the need to the external energy, and only rely on and automatically adjusted by the change of tune medium pressure itself, reliability is high.But because hydraulic dynamometer output changes with combustion engine changed power, pressure release holding valve response speed is slow, when combustion engine changed power, output change not in time, cause water-supply voltage-stabilizing can not meet hydraulic dynamometer requirement, therefore, this valve is tentatively set up for system pressure in systems in which, and get rid of the larger pressure surge in pump discharge place, system pressure is stabilized in certain value.
Its tank body top of full bellows water tank of the present invention is provided with mounting hole, and capsule is lifted in tank body, and the mouth of a river, bottom of capsule is fitted on the flange of the mouth of a river.
Full bellows water tank is usually used in emergency water supply at present, and the present invention adopts this water tank to absorb pressure of supply water pulsation, obtains good voltage regulation result.During normal work, full bellows water tank and general Accumulator on Hydraulic System functional similarity, pressure of supply water pulsation is absorbed by water tank air bag, realizes pressure stabilization function; Full bellows water tank also plays Emergency water supply effect simultaneously, and when feed pump and reserve pump break down simultaneously, when cannot supply water, in water tank, water is under tank internal gas pressure and Action of Gravity Field, flows out from tank, feeds to hydraulic dynamometer, ensures that dynamometer machine emergency rating supplies water.
Common water tank is passed through appropriate design by the present invention, be applied in the accurate voltage stabilizing of water system, adopt method provided by the invention, the accurate voltage stabilizing in hydraulic dynamometer circulating water supply system can be realized, the method is simple, be easy to realize, cheap and voltage regulation result is good, the water supply requirement of hydraulic dynamometer can be met, there is promotional value.Current the method has entered through engineering approaches application, and systematic Water supply pressure pulsation reaches dynamometer machine periodical feeding pressure fluctuation requirement, completes gas turbine output shaft power measurement smoothly.
Accompanying drawing explanation
Fig. 1 hydraulic dynamometer circulating water supply system schematic diagram (wherein the full bellows water tank of 1-, 2-pressure transducer, 3-temperature sensor, 4-water supply motorized valve, 5-cooling tower, 6-thermometer, 7-tensimeter, 8-gate valve, 9-heat-exchanger pump, 10-dredge pump, 11-hot-tub, 12-liquid level sensor, 13-water supply pump, 14-water cooling pond, 15-pressure release holding valve, 16-filtrator, 17-air release, 18-electric gate valve, 19-hydraulic dynamometer, 19a-water inlet control valve);
Fig. 2 full bellows water tank anhydrous state front view (wherein air, 22-capsule, 23-inflation inlet, 24-tensimeter, 25-mounting flange, 26-mounting hole, 27-hanger, 28-mouth of a river flange, 29-mouth of a river electric gate valve in 21-tank);
Fig. 3 full bellows water tank anhydrous state side view;
Fig. 4 full bellows water tank water-filling state front view;
Fig. 5 full bellows water tank water-filling side view of the state.
Hydraulic dynamometer circulating water supply system principle as shown in Figure 1, is provided with two water supply pumps, 13, two heat-exchanger pumps 9 and a dredge pump 10 in water system.Two water supply pumps 13, master one is standby for heat-exchanger pump 9 one, chilled water is after water supply pump 13 supercharging, enter filtrator 16, filtrator 16 also arranges two, one master one is standby, cold water after filtration, after the preliminary pressure regulation of pressure release holding valve 15 pressure regulation, enter main-supply road, main-supply roadside road is provided with two full bellows water tanks 1, two full bellows water tanks 1 work simultaneously, for absorption system pressure fluctuation, and for Emergency water supply, through pressure regulation, voltage stabilizing, after filtration, meet the chilled water infeed hydraulic dynamometer 19 that hydraulic dynamometer 19 requires, the hot water of discharging after hydraulic dynamometer 19 does work enters in hot-tub 11, hot water in hot-tub 11 is sent into cooling tower 5 by heat-exchanger pump 9, cooled water flows back to water cooling pond 14 by gravity, complete cooling water circulation supply.
Full bellows water tank 1(Fig. 2 ~ 4) its tank body top is provided with mounting hole 26, and seal with mounting flange 25 and sealing gasket, capsule 22 is lifted in tank body, and the top of capsule 22 is provided with hanger, be connected with hanger on mounting flange 25 27, the mouth of a river, bottom of capsule 22 is fitted on mouth of a river flange 28.
The tightness test of advance row installed by capsule 22, guarantees without leak source.After capsule 22 is installed to full bellows water tank 1, (now mouth of a river electric gate valve 29 is in opening to inflate to full bellows water tank 1 from water tank inflation inlet 23, to discharge gas in capsule 22), carry out tank body leakage test, charge pressure 0.5MPa, after 12 hours, tensimeter 24 shows pressure in tank and remains unchanged, without leak source, close mouth of a river electric gate valve 29, keep without gaseity in capsule 22.
After tightness test, exit from inflation inlet 23, tank internal gas pressure is made to keep 0.08Mpa (this pressure set points can set according to job requirement), start water supply pump 13, until gas in pipeline after air release 17 emptying, open mouth of a river electric gate valve 29, water-filling in capsule 22, spreading state (see Fig. 4,5) is become gradually by anhydrous stitching state (see Fig. 2,3), hydraulic pressure is elevated to system pressure gradually, capsule 22 volume increases makes gas pressurized in tank, and now in tank, in gaseous tension and capsule 22, hydraulic pressure is consistent.
Static system is debugged: utilize hydraulic dynamometer 19 water inlet water supply motorized valve 4 to simulate hydraulic dynamometer water inlet control valve and carry out debugging test, in test, discharge is from 0-285m
3in/h change procedure, pressure pulse value is not more than ± 0.1kgf/cm
2, be far smaller than hydraulic dynamometer 19 water supply requirement ± 0.14kgf/cm
System on-line debugging: control inflow by the water inlet control valve 19a of hydraulic dynamometer 19, debug results is consistent with static debugging, and pressure fluctuation is not more than ± 0.1kgf/cm
2, meet hydraulic dynamometer 19 water supply requirement, and be successfully completed gas turbine output shaft power Measurement accuracy and hydraulic dynamometer 19 debugging efforts.