CN102705811B - 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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- CN102705811B CN102705811B CN201210087609.8A CN201210087609A CN102705811B CN 102705811 B CN102705811 B CN 102705811B CN 201210087609 A CN201210087609 A CN 201210087609A CN 102705811 B CN102705811 B CN 102705811B
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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 the control method without boiler water circulating pump supercritical once-through boiler.
Background technology
Current many large electric power plant unit supercritical once-through boilers do not configure 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 again agglomerator, and the energy of getting back to like this this part water of agglomerator can not reclaim.Require direct current cooker that feedwater minimum flow is not less than 25% maximum continuous rating to describe as example take boiler factory.In order to guarantee that safe operation of the boiler boiler factory requires feedwater minimum flow to be not less than 25% boiler maximum continuous rating, thus startup stage reflux splitter the stove water yield consumed a large amount of energy greatlyr.Specifically, the working medium of boiler mainly absorbs heat by two kinds of modes: in burner hearth, the heat release of working medium radiation-absorbing is main, and superheater heating steam is to absorb convection heat transfer as main.Boiler feedwater is sent in the water-cooling wall in burner hearth and is heated by feed pump, and the steam water interface after heating enters in steam-water separator, and steam-water separator separates steam with water.Steam enters superheater and further absorbs the superheated steam that heat generation meets the demands, and water returns in condenser by steam-water separator control valve.The liquid level that act as adjusting steam-water separator of steam-water separator control valve, can not enter in superheater pipeline water.The total amount of heat Q that coal produces in boiler combustion is respectively by feedwater, vapor absorption, and after-heat enters atmosphere by flue gas:
Q=Q
radiation+ Q
convection current+ Q
smoke evacuation(1)
Q
radiationfor the heat of coal combustion radiation heat release heated feed water in burner hearth, make feedwater become steam water interface;
Q
convection currentfor pass through the heat of convection type heating vapour-water separator steam out after coal combustion in superheater, make saturated vapor become satisfactory superheated steam;
Q
smoke evacuationfor the remaining heat of being taken away by flue gas after coal combustion heating working medium.
Under normal circumstances, boiler is from igniting to being warmed up to the load process of 25% boiler maximum continuous rating, the consumption of coal progressively increases stage by stage, and the confluent that boiler maker business's requirement enters in boiler is the feedwater flow that is not less than 25% boiler maximum continuous rating.In the intensification of boiler, boost phase process, coal amount progressively increases, but it is relatively stable within each period, to enter steam coal amount, so that the heat energy Q that coal combustion produces keeps is relatively constant, and Q
radiation, Q
convection currentand Q
smoke evacuationalso relatively stable, the confluent that enters boiler by boiler factory's design is not less than 25% boiler maximum continuous rating.But the boiler startup stage enters the confluent of boiler 25% boiler maximum continuous rating, at same Q
radiationotherwise the quantity of steam that the confluent that heating enters boiler furnace enters the more greatly steam-water separator less quantity of steam of the fewer generation of feedwater flow is larger, if it is large to enter the feedwater flow of boiler, the water yield of getting back to condenser by steam-water separator control valve is also larger, Q
radiationheated feed water is got back to condenser and is recycled again cooling water to take away heat larger.Simultaneously less owing to entering steam flow in superheater, enter the relatively stable Q of convection heat transfer heating surface part
convection currentheat cause superheat steam temperature too high because steam flow reduces, need to increase spray water flux control vapor (steam) temperature, increase desuperheating water and cause feed pump power consumption to increase.
Summary of the invention
The object of this invention is to provide a kind of control method without the feedwater of boiler water circulating pump supercritical once-through boiler that can guarantee that supercritical once-through boiler safe operation can be saved energy and reduce the cost again in boiler startup process and easily realize.
Technical solution of the present invention is as follows:
Without a control method for boiler water circulating pump supercritical once-through boiler feedwater, provide comprise feed water flow regulating valve and steam-water separator control valve without boiler water circulating pump supercritical once-through boiler system.Given direct current cooker is by starting to the given feedwater flow of loading while becoming a cadre state DC operation.Dynamically adjust according to the aperture of described steam-water separator control valve, and coordinate with described feed water flow regulating valve, adjust described given feedwater flow obtain described direct current cooker start to become a cadre state DC operation process use actual feedwater flow.
Further, described actual feedwater flow=described given feedwater flow+feedwater correction value,
Described feedwater correction value=∫ (S-K) dt
Wherein: lower limit < feedwater 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, described given feedwater flow define following steps; Gather unit load signal; By specific function relation, described unit load signal is converted to the given signal of instant feedwater flow; Given boiler minimum discharge; General election module is provided, obtains described given feedwater flow for selecting the given signal of instant feedwater flow or boiler minimum discharge.
Further, described feedwater correction value define 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; By PID adjuster, described steam-water separator control valve desired value and described actual aperture signal are carried out to PID computing, obtain described feedwater correction value.
Advantage of the present invention is: the feedwater flow that enters boiler by the aperture correction of steam-water separator control valve, be easy to adopt universal control devices to realize, when steam-water separator control valve opening is greater than desired value by reducing within the specific limits the Q that enters boiler feedwater flow and make burner hearth
radiationthe steam of heat generation increases, and the stove discharge refluxing by steam-water separator control valve reduces, and can guarantee like this safe operation of boiler, can reduce again the heat loss of reflow ovens water, reduces the spray water flux of superheat steam temperature control.
Accompanying drawing explanation
Fig. 1 is the process chart of the embodiment of the present invention;
Fig. 2 is the logic schematic diagram of realizing of the embodiment of the present invention;
Description of reference numerals:
1, steam-water separator, 3, feedwater flow 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, 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 technical program is elaborated.
Consult Fig. 1, a kind of theory structure schematic diagram without boiler water circulating pump supercritical once-through boiler device, wherein coal, at stove chamber inner combustion, is provided with water-cooling wall and superheater 6 in boiler, and the flue gas being absorbed after heat is discharged from chimney 12.Feedwater is after deaerating heater 11 deoxygenation heating, send in water-cooling wall and heat by feed pump 4, control by feedwater flow valve 3 confluent entering in water-cooling wall, steam water interface after water-cooling wall heating in burner hearth enters the interior separation of steam-water separator 1, saturated vapor enters the interior continuation heating of superheater 6, superheated steam is sent into the interior acting of steam turbine 7, drives generator 8 to work; Stove water in steam-water separator 1 enters in condenser 9 by steam-water separator control valve 5, control the liquid level of steam-water separator 1 by steam-water separator control valve 5, the steam discharge of steam turbine 7 also enters in condenser 9, after circulating cooling water for cooling, send in deaerating heater 11 by condensate pump 10 as feedwater source, get back to condensate pump 10 through oxygen-eliminating device water after treatment.Coal combustion produce total amount of heat Q in burner hearth respectively by radiation exotherm by Q
radiationmain heated feed water, by Convective Heating mode by Q
convection currentheating saturated vapor, remaining heat by chimney by remaining heat Q
smoke evacuationdischarged to atmosphere.Condenser 9 will enter heat Q in the condensate water of agglomerator
circulationpass to recirculated cooling water.
See also Fig. 1 and Fig. 2, control method without boiler water circulating pump supercritical once-through boiler is, given direct current cooker is by the given feedwater flow of minimum load operation that starts to the state DC operation of becoming a cadre, dynamically adjust according to the aperture of described steam-water separator control valve, and coordinate with described feed water flow regulating valve, on the basis of described given feedwater flow, adjustment obtains described direct current cooker and starts to the actual feedwater flow that the state DC operation process of becoming a cadre is used.
Described actual feedwater flow=described given feedwater flow+feedwater correction value,
Described feedwater correction value=∫ (S-K) dt
Wherein: lower limit < feedwater 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, described given feedwater flow is different numerical value according to different units, is generally 20%～30% boiler maximum continuous rating, is certainly also not limited to this number range, and concrete determines according to unit.The aperture desired value of steam-water separator control valve be also 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 of/hour < feedwater correction value <100 ton/hour.It should be noted that, in the technical program, indication supercriticality comprises supercriticality, ultra supercritical state.
First, determining by loop boiler load detection module 13, load feedwater modular converter 14, general election comparator 15, minimum discharge setting signal 20 of given feedwater flow.Load detection module 13 is for gathering unit load signal, specific function through overload feedwater modular converter 14 is related to that f (x) is converted to instant feedwater flow setting signal, 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 is selected the given feedwater flow of output through general election comparator 15.
Secondly, feedwater correction value is determined 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 steam-water separator control valve constantly.
Adjust boiler feedwater flow by the aperture that monitors steam-water separator control valve, make to enter the quantity of steam of steam-water separator and the stove water yield a rational level by the adjustment of feedwater flow, the aperture of steam-water separator control valve is stabilized in 25% left and right, and to maintain separator water level be ordinary water level, the stove discharge refluxing by steam-water separator control valve is stabilized in a rational scope, can guarantee the safe operation of boiler, can reduce again the heat loss of reflow ovens water, reduce the spray water flux of superheat steam temperature control simultaneously.
The aperture of S according to variety classes boiler stable operation in the time becoming a cadre state set.As required 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 boiler factory in the Orient, the task of steam-water separator control valve is the water level that maintains steam-water separator, adopt in actual applications this technology dynamically to adjust feedwater flow according to the aperture of steam-water separator control valve, if steam-water separator control valve opening is greater than 25%, the quantity of steam to water generates that enters burner hearth heating is little, the stove water yield is large, gradually reduces confluent and is absorbing same Q
radiationin situation, steam increase, stove water reduce, the water level reduction steam-water separator control valve of steam-water separator turns down the aperture of steam-water separator control valve automatically in order to maintain water level, in the time that steam-water separator control valve opening is less than 25%, feedwater flow progressively increases, and progressively adjusts by feedwater flow the water level that makes steam-water separator control valve remain on 25% left and right to maintain again steam-water separator.The fuel that enters burner hearth along with boiler load increase increases, and feedwater flow remains stable, Q after reaching the maximum continuous rating of 25%-30% boiler
radiationso constantly increase needs that steam progressively increases to meet steam turbine vapour simultaneously stove water gradually reduce steam-water separator control valve and progressively turn down for maintaining water level, in the time of steam-water separator control valve complete shut-down, illustrating feeds water entering separator before water be all converted to steam boiler and entered dry state.
In the scope aperture of steam-water separator control valve being controlled at by the control of feedwater flow, the flow that makes to be back to agglomerator by steam-water separator control valve not only guarantees the safe operation of boiler but also reduce the loss of feedwater reflux heat in a rational scope, reduce the desuperheating water consumption of super-heated steam temperature control, be beneficial in the boiler state process control of becoming a cadre.
Above-listed detailed description is for the illustrating of one of the present invention possible embodiments, and this embodiment is not in order to limit the scope of the claims of the present invention, and the equivalence that all the present invention of disengaging do is implemented or changed, and all should be contained in the scope of the claims of this case.
Claims (3)
1. without a control method for boiler water circulating pump supercritical once-through boiler feedwater, it is characterized in that, comprise the following steps,
Provide comprise feed water flow regulating valve and steam-water separator control valve without boiler water circulating pump supercritical once-through boiler system;
Set direct current cooker by starting to the given feedwater flow of loading while becoming a cadre state DC operation;
Dynamically adjust according to the aperture of described steam-water separator control valve, and coordinate with described feed water flow regulating valve, on the basis of described given feedwater flow, adjustment obtains described direct current cooker and starts to the actual feedwater flow that the state DC operation process of becoming a cadre is used;
Described actual feedwater flow=described given feedwater flow+feedwater correction value,
Described feedwater correction value=∫ (S-K) dt
Wherein: lower limit < feedwater 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.
2. the control method without boiler water circulating pump supercritical once-through boiler feedwater as claimed in claim 1, is characterized in that, described given feedwater flow define following steps;
Gather unit load signal;
By specific function relation, described unit load signal is converted to the given signal of instant feedwater flow;
Given boiler minimum discharge;
General election module is provided, obtains described given feedwater flow for selecting the given signal of described instant feedwater flow or described boiler minimum discharge.
3. the control method without boiler water circulating pump supercritical once-through boiler feedwater as claimed in claim 1 or 2, is characterized in that, described 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;
By PID adjuster, described steam-water separator control valve opening desired value and described actual aperture signal are carried out to PID computing, obtain described 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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| CN103807847A (en) * | 2014-02-16 | 2014-05-21 | 国家电网公司 | Large-capacity boiler whole-course water feeing control system |
| 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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| JP2599026B2 (en) * | 1990-10-12 | 1997-04-09 | 動力炉・核燃料開発事業団 | Steam drum water level control method when water supply control valve is switched |
| JPH11294712A (en) * | 1998-04-10 | 1999-10-29 | Nippon Steel Corp | Method and apparatus for reducing pressure loss of boiler water supply system |
| CN100557306C (en) * | 2007-10-11 | 2009-11-04 | 冯伟忠 | The startup method of band circulating-stove-water pump monotube boiler near steam heating boilers |
| CN102252312B (en) * | 2011-05-16 | 2013-02-27 | 上海发电设备成套设计研究院 | Full-process automatic control system for supercritical unit water supply system |
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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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