CN102705811A - Feed water control method for supercritical concurrent boiler without boiler-water circulating pump - Google Patents
Feed water control method for supercritical concurrent boiler without boiler-water circulating pump Download PDFInfo
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- CN102705811A CN102705811A CN2012100876098A CN201210087609A CN102705811A CN 102705811 A CN102705811 A CN 102705811A CN 2012100876098 A CN2012100876098 A CN 2012100876098A CN 201210087609 A CN201210087609 A CN 201210087609A CN 102705811 A CN102705811 A CN 102705811A
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Abstract
A feed water control method for a supercritical concurrent boiler without a boiler-water circulating pump includes providing a supercritical concurrent boiler system without the boiler-water circulating pump. The supercritical concurrent boiler system without the boiler-water circulating pump comprises a feed water flow control valve and a steam separator regulating valve. The feed water flow for load of concurrent operation of the concurrent boiler from starting to drying state is preset. Actual feed water flow during concurrent operation process of the concurrent boiler from starting to drying state is obtained by dynamically regulating opening degree of the steam separator regulating valve to regulate preset feed water flow. The feed water flow entering the boiler is adjusted by regulating the opening degree of the steam separator regulating valve. The feed water control method for the supercritical concurrent boiler without the boiler-water circulating pump is easy to realize by common control equipment.
Description
Technical field
The present invention relates to not have the control method of boiler water circulating pump supercritical once-through boiler.
Background technology
Present many large electric power plant unit supercritical once-through boilers do not dispose boiler water circulating pump, so the feedwater in boiler startup stage directly provides by feed pump, the water of steam-water separator is got back to the aggegation device again, and the energy of getting back to this part water of aggegation device like this can not reclaim.The direct current cooker that requires the feedwater minimum flow to be not less than 25% maximum continuous rating with the boiler factory is that example describes.In order to guarantee that the safe operation of the boiler boiler factory requires the feedwater minimum flow to be not less than 25% boiler maximum continuous rating, thus the startup stage reflux splitter the bigger lot of energy that consumed of the stove water yield.Concrete, the working medium of boiler mainly absorbs heat through dual mode: working medium absorption radiation heat release is main in the burner hearth, and superheater heating steam is main to absorb convection heat transfer.Boiler feedwater is sent in the water-cooling wall in the burner hearth through feed pump and is heated, and the steam water interface after the heating gets in the steam-water separator, and steam-water separator is with steam and separated form water.Steam gets into superheater and further absorbs the superheated steam that the heat generation meets the demands, and water returns in the condenser through the steam-water separator control valve.The liquid level that act as the adjusting steam-water separator of steam-water separator control valve can not get in the superheater pipeline water.Coal is fed water respectively at the total amount of heat Q that boiler combustion produces, vapor absorption, and after-heat enters atmosphere through flue gas:
Q=Q
Radiation+ Q
Convection current+ Q
Smoke evacuation(1)
Q
RadiationBe the heat of coal combustion radiation heat release heated feed water in burner hearth, make feedwater become steam water interface;
Q
Convection currentHeat for the steam that in superheater, comes out through convection type heating vapour-water separator behind the coal combustion makes saturated vapor become satisfactory superheated steam;
Q
Smoke evacuationBe the remaining heat of being taken away by flue gas behind the coal combustion heating working medium.
Generally; Boiler is from lighting a fire to the load process that is warmed up to 25% boiler maximum continuous rating; The consumption of coal progressively increases stage by stage, and the confluent that boiler maker merchant's requirement gets in the boiler is the feedwater flow that is not less than 25% boiler maximum continuous rating.The coal amount progressively increases in the intensification of boiler, boost phase process, but it is relatively stable in each period, to get into the steam coal amount, so that the heat energy Q that coal combustion produces keeps is constant relatively, and Q
Radiation, Q
Convection currentAnd Q
Smoke evacuationAlso relatively stable, the confluent that gets into boiler by boiler factory's design is not less than 25% boiler maximum continuous rating.But the boiler startup stage gets into the confluent of boiler 25% boiler maximum continuous rating, at same Q
RadiationThe quantity of steam of the fewer generation of feedwater flow is big more more less otherwise heating gets into the quantity of steam of the big more entering steam-water separator of confluent of boiler furnace; If it is big then to get back to the water yield of condenser through the steam-water separator control valve also bigger, Q to get into the feedwater flow of boiler
RadiationHeated feed water is got back to condenser and is recycled cooling water again to take away heat big more.Because the steam flow that gets in the superheater is less, get into the relatively stable Q of convection heat transfer heating surface part simultaneously
Convection currentHeat cause superheat steam temperature too high because of steam flow reduces, need to increase spray water flux control vapor (steam) temperature, increase desuperheating water and cause the feed pump power consumption to increase.
Summary of the invention
The control method that the purpose of this invention is to provide a kind of no boiler water circulating pump supercritical once-through boiler feedwater that can guarantee that the supercritical once-through boiler safe operation can be saved energy and reduce the cost again and realize easily in the boiler startup process.
Technical solution of the present invention is following:
A kind of control method of not having boiler water circulating pump supercritical once-through boiler feedwater provides the no boiler water circulating pump supercritical once-through boiler that comprises feed water flow regulating valve and steam-water separator control valve system.Given direct current cooker is by starting to the given feedwater flow of loading when becoming a cadre the attitude DC operation.Aperture according to said steam-water separator control valve is dynamically adjusted, and cooperates with said feed water flow regulating valve, adjusts said given feedwater flow and obtains said direct current cooker startup to the actual feedwater flow that uses to the attitude DC operation process of becoming a cadre.
Further, said actual feedwater flow=said given feedwater flow+feedwater correction value,
Said feedwater correction value=∫ (S-K) dt
Wherein: lower limit＜flow correction value＜higher limit, S is the aperture desired value of steam-water separator control valve, K is the aperture of steam-water separator control valve.
Further, said given feedwater flow defines following steps; Gather the unit load signal; Convert said unit load signal into instant feedwater flow given signal through the specific function relation; Given boiler minimum discharge; The general election module is provided, is used to select given signal of instant feedwater flow or boiler minimum discharge and obtains said given feedwater flow.
Further, said feedwater correction value defines following steps; The desired value of the aperture of given steam-water separator control valve; Gather the actual aperture signal of steam-water separator control valve; Through the PID adjuster said steam-water separator control valve desired value and said actual aperture signal are carried out the PID computing, obtain said feedwater correction value.
Advantage of the present invention is: the feedwater flow that gets into boiler through the aperture correction of steam-water separator control valve; Be easy to adopt universal control devices to realize; The steam-water separator control valve opening gets into the steam that Q radiations heat energy that boiler feedwater flow makes burner hearth produces and increases through reducing within the specific limits during greater than desired value; The stove discharge that refluxes through the steam-water separator control valve reduces; Can guarantee the safe operation of boiler like this, can reduce the heat loss of reflow ovens water again, reduce the spray water flux of superheat steam temperature control.
Description of drawings
Fig. 1 is the process chart of the embodiment of the invention;
Fig. 2 is the realization logic schematic diagram of the embodiment of the invention;
Description of reference numerals:
1, steam-water separator, 2, heat(ing) coil, 3, the feedwater flow metered valve, 4, feed pump; 5, steam-water separator control valve, 6, superheater, 7, steam turbine, 8, generator; 9, condenser, 10, condensate pump, 11, deaerating heater, 12, chimney; 13, load detection module, 14, load feedwater modular converter, 15, the general election comparator, 16, adder; 17, PID adjuster, 18, steam-water separator control valve opening setting value, 19, steam-water separator control valve opening signal, 20, the given signal of boiler minimum discharge.
The specific embodiment
Below in conjunction with accompanying drawing the present technique scheme is elaborated.
Consult Fig. 1, a kind of theory structure sketch map that does not have boiler water circulating pump supercritical once-through boiler device, wherein coal is in the burner hearth internal combustion, is provided with water-cooling wall 2 and superheater 6 in the boiler, and the flue gas that is absorbed behind the heat is discharged from chimney 12.After feedwater is heated through deaerating heater 11 deoxygenations; Send into heating in the water-cooling wall 2 through feed pump 4; Get into the confluent in the water-cooling wall 2 through 3 controls of feedwater flow metered valve, get in the steam-water separator 1 through the steam water interface after 2 heating of water-cooling wall in the burner hearth and separate, saturated vapor gets into and continues heating in the superheater 6; Superheated steam is sent into acting in the steam turbine 7, drives generator 8 work; Stove water in the steam-water separator 1 enters in the condenser 9 through steam-water separator control valve 5; Liquid level through steam-water separator control valve 5 control steam-water separators 1; The steam discharge of steam turbine 7 also gets in the condenser 9; After the recirculated cooling water cooling, to send in the deaerating heater 11 through condensate pump 10 as the feedwater source, the water after handling through oxygen-eliminating device is got back to condensate pump 10.The total amount of heat Q that coal combustion produces in burner hearth respectively through the radiation exotherm with Q
RadiationMain heated feed water, through the Convective Heating mode with Q
Convection currentHeating saturated vapor, remaining heat pass through chimney with remaining heat Q
Smoke evacuationRow is to atmosphere.Condenser 9 will get into the interior heat Q of condensate of aggegation device
CirculationPass to recirculated cooling water.
Please consult Fig. 1 and Fig. 2 in the lump; The control method of no boiler water circulating pump supercritical once-through boiler does; Given direct current cooker is by the given feedwater flow of the minimum load operation that starts to the attitude DC operation of becoming a cadre; Aperture according to said steam-water separator control valve is dynamically adjusted, and cooperates with said feed water flow regulating valve, and adjustment obtains said direct current cooker startup to the actual feedwater flow that uses to the attitude DC operation process of becoming a cadre on the basis of said given feedwater flow.
Said actual feedwater flow=said given feedwater flow+feedwater correction value,
Said feedwater correction value=∫ (S-K) dt
Wherein: lower limit＜flow correction value＜higher limit, S is the aperture desired value of steam-water separator control valve, K is the aperture of steam-water separator control valve.Wherein, said given feedwater flow is a different numerical according to different units, is 20%～30% boiler maximum continuous rating generally speaking, also is not limited to this number range certainly, and concrete decides according to unit.The aperture desired value of steam-water separator control valve also be to change according to different unit numerical value.In the present embodiment, given feedwater flow is 25% maximum continuous rating, and the aperture desired value of steam-water separator control valve is 25%.-100 tons/hour＜flow correction value＜100 ton/hour.Need to prove that the indication supercriticality comprises supercriticality, ultra supercritical state in the present technique scheme.
At first, given feedwater flow confirms by loop boiler load detection module 13, load feedwater modular converter 14, general election comparator 15, minimum discharge setting signal 20.Load detection module 13 is used to gather the unit load signal; Specific function through overload feedwater modular converter 14 concerns that f (x) converts instant feedwater flow setting signal into, and it is the feedwater flow that is not less than 25% boiler maximum continuous rating that the signal of load feedwater modular converter 14 and minimum discharge setting signal 20 selects to export given feedwater flow through general election comparator 15.
Secondly, the feedwater correction value is confirmed by PID adjuster 17, steam-water separator control valve opening setting value 18, steam-water separator control valve opening signal 19.Steam-water separator control valve opening setting value 18 is the desired value of steam-water separator control valve opening; In the present embodiment, the aperture that steam-water separator control valve opening setting value is 25%, steam-water separator control valve opening signal 19 is monitored the steam-water separator control valve constantly.PID adjuster 17 is PID (ratio, integration, a differential) adjuster, and steam-water separator control valve opening setting value 18, steam-water separator control valve opening signal 19 signals are by receiving at PID adjuster 17 and carrying out the PID computing.When the aperture of steam-water separator control valve during greater than setting value, PID adjuster 17 produces the flow correction value that gradually reduces, and it is limited to-100 tons/hour down, makes the feedwater flow reduction that gets into boiler, identical Q in boiler
RadiationThe steam-water separator control valve opening that quantity of steam increases in the steam water interface that produces, the steam-water separator liquid level is kept in water yield minimizing like this reduces progressively gets back to desired value.On the contrary when the steam-water separator control valve opening during less than setting value flow setting value after module 17 computings, export progressively to increase and be limited to 100 tons/hour on it.
At last, adder 16 adds that with 17 outputs of PID adjuster 15 outputs of general election comparator produce actual feedwater flow.In this instance, actual feedwater flow is (25% boiler maximum continuous rating-100)～(25% boiler maximum continuous rating+100).
Through keeping watch on the aperture adjustment boiler feedwater flow of steam-water separator control valve; Adjustment through feedwater flow makes the quantity of steam that gets into steam-water separator and the stove water yield a reasonable levels; The aperture of steam-water separator control valve is stabilized in about 25%, and to keep separator water level be ordinary water level; The stove discharge that refluxes through the steam-water separator control valve is stabilized in the reasonable range; Can guarantee the safe operation of boiler, can reduce the heat loss of reflow ovens water again, reduce the spray water flux of superheat steam temperature control simultaneously.
The aperture of S according to the variety classes boiler stable operation when becoming a cadre attitude set.As require the feedwater flow of boiler startup to be not less than 25% boiler maximum continuous rating in the 600MW unit supercritical once-through boiler that dispatch from the factory in the boiler factory in the Orient; The task of steam-water separator control valve is to keep the water level of steam-water separator; In practical application, adopt present technique dynamically to adjust feedwater flow according to the aperture of steam-water separator control valve; If the steam-water separator control valve opening is greater than 25% then get into that the quantity of steam of giving water generates of burner hearth heating is little, the stove water yield is big; Gradually reduce confluent and absorbing steam increase under the same Q radiation event, the minimizing of stove water; The water level of steam-water separator reduces the steam-water separator control valve in order to keep the aperture that water level turns down the steam-water separator control valve automatically; When steam-water separator control valve opening feedwater flow less than 25% time progressively increases, the progressively adjustment through feedwater flow makes the steam-water separator control valve remain on the water level that can keep steam-water separator about 25% again.The fuel that promptly gets into burner hearth along with the boiler load increase increases; Feedwater flow reach keep after the maximum continuous rating of 25%-30% boiler stable; So the Q radiation constantly increase steam progressively increase with satisfy needs that steam turbine uses vapour simultaneously stove water gradually reduce the steam-water separator control valve and progressively turn down for keeping water level, explanation feedwater water before getting into separator has all converted steam boiler entering dry state into when steam-water separator control valve complete shut-down.
In the scope that control through feedwater flow is controlled at the aperture of steam-water separator control valve, make the flow that is back to the aggegation device through the steam-water separator control valve in a reasonable range, not only guarantee the safe operation of boiler but also reduce the loss of feedwater reflux heat, reduce super-heated steam temperature control the desuperheating water consumption, be beneficial in the boiler attitude process control of becoming a cadre.
Above-listed detailed description is to the specifying of one of the present invention possible embodiments, and this embodiment is not in order to limiting claim of the present invention, and the equivalence that all the present invention of disengaging do is implemented or change, all should be contained in the claim of this case.
Claims (4)
1. a control method of not having the feedwater of boiler water circulating pump supercritical once-through boiler is characterized in that, may further comprise the steps,
The no boiler water circulating pump supercritical once-through boiler that comprises feed water flow regulating valve and steam-water separator control valve system is provided;
Set direct current cooker by starting to the given feedwater flow of loading when becoming a cadre the attitude DC operation;
Aperture according to said steam-water separator control valve is dynamically adjusted, and cooperates with said feed water flow regulating valve, and adjustment obtains said direct current cooker startup to the actual feedwater flow that uses to the attitude DC operation process of becoming a cadre on the basis of said given feedwater flow.
2. the control method of no boiler water circulating pump supercritical once-through boiler feedwater as claimed in claim 1 is characterized in that, said actual feedwater flow=said given feedwater flow+feedwater correction value,
Said feedwater correction value=∫ (S-K) dt
Wherein: lower limit＜flow correction value＜higher limit, S is the aperture desired value of steam-water separator control valve, K is the aperture of steam-water separator control valve.
3. the control method of no boiler water circulating pump supercritical once-through boiler feedwater as claimed in claim 2 is characterized in that, said given feedwater flow define following steps;
Gather the unit load signal;
Convert said unit load signal into instant feedwater flow given signal through the specific function relation; Given boiler minimum discharge;
The general election module is provided, is used to select given signal of said instant feedwater flow or said boiler minimum discharge and obtains said given feedwater flow.
4. like the control method of claim 2 or 3 described no boiler water circulating pump supercritical once-through boilers feedwater, it is characterized in that, said feedwater correction value define following steps;
The aperture desired value of given steam-water separator control valve;
Gather the actual aperture signal of steam-water separator control valve;
Through the PID adjuster said steam-water separator control valve opening desired value and said actual aperture signal are carried out the PID computing, obtain said feedwater correction value.
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| CN201210087609.8A CN102705811B (en) | 2012-03-28 | 2012-03-28 | Feed water control method for supercritical concurrent boiler without boiler-water circulating pump |
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| CN201210087609.8A CN102705811B (en) | 2012-03-28 | 2012-03-28 | Feed water control method for supercritical concurrent boiler without boiler-water circulating pump |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103807847A (en) * | 2014-02-16 | 2014-05-21 | 国家电网公司 | Large-capacity boiler whole-course water feeing control system |
| CN113883496A (en) * | 2021-09-26 | 2022-01-04 | 华能巢湖发电有限责任公司 | Furnace circulating pump water level control method |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103807847A (en) * | 2014-02-16 | 2014-05-21 | 国家电网公司 | Large-capacity boiler whole-course water feeing control system |
| CN113883496A (en) * | 2021-09-26 | 2022-01-04 | 华能巢湖发电有限责任公司 | Furnace circulating pump water level control method |
| CN113883496B (en) * | 2021-09-26 | 2023-08-11 | 华能巢湖发电有限责任公司 | Water level control method for circulating pump of furnace |
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Address after: 510080 Dongfeng East Road, Dongfeng, Guangdong, Guangzhou, Zhejiang Province, No. 8 Patentee after: Electric Power Research Institute of Guangdong Power Grid Co.,Ltd. Address before: 510080 Dongfeng East Road, Dongfeng, Guangdong, Guangzhou, Zhejiang Province, No. 8 Patentee before: ELECTRIC POWER RESEARCH INSTITUTE OF GUANGDONG POWER GRID Corp. |
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