CN204922939U

CN204922939U - Wind waste heat utilization equipment of heat with use of fan heater system linking

Info

Publication number: CN204922939U
Application number: CN201520436607.4U
Authority: CN
Inventors: 陈保奎; 黄新元; 田军; 王伟; 马传岗
Original assignee: SHANDONG ECO-POWER ENERGY SAVING SCIENCE & TECHNOLOGY Co Ltd
Current assignee: Shandong Environmental Protection Technology Co., Ltd.
Priority date: 2015-06-24
Filing date: 2015-06-24
Publication date: 2015-12-30
Anticipated expiration: 2025-06-24

Abstract

The utility model relates to a wind waste heat utilization equipment of heat with use of fan heater system linking, the utility model discloses forced air cooler of installation heat and air damper in boiler air heater exports wind channel of heat to in cooler wind channel play, the entry wind channel is parallelly connected sets up the bypass wind channel, sets up air damper in the bypass wind channel, adjusts the conduct heat adjustment of power of door in bypass wind channel and the main road wind channel through adjusting, forced air cooler of heat connects intake female pipe and the female pipe of return water. Wind waste heat was got back to the low system that adds and is squeezed to draw gas and increase the steam turbine work done when this technique of utilization was moved summer, and the air heater amount of wind of flowing through increases, and boiler exhaust gas temperature descends, and the unit cycle efficiency rises. But the vapour quantity is assisted to partial replacement in winter steam fan heater, improves the unit cycle efficiency. Compare with traditional fan heater, improved air heater cold junction wall temperature by a wide margin under the prerequisite that does not improve exhaust gas temperature, can alleviate air preheater deposition, corruption and improve boiler efficiency.

Description

The heat primary air residual heat using device used with steam air heater system, coupled

Technical field

The present invention relates to Thermal generation unit field.In particular to a kind of heat primary air residual heat using device used with steam air heater system, coupled, it utilizes heat primary air waste heat as the residual heat using device of Steam Turbine Regenerative System thermal source and air preheater steam air heater thermal source, and described device is installed in coal unit therrmodynamic system.

Background technology

Due to raw coal bituminous coal and meager coal reserve-production ratio, raw coal price, low NO transformation, the surely a series of factor such as combustion property, unburned carbon in flue dust, current coal-fired power station boiler much uses that the boiler of meager coal is all numerous and confused changes fuel into bituminous coal.Current combustion bituminous coal unit ratio is caused significantly to improve.

For the generation avoiding pulverized coal preparation system generation spontaneous combustion and blast etc. to jeopardize device security accident, desiccant temperature needed for pulverized coal preparation system is often lower than heat primary air temperature, and conventional method mixes at coal pulverizer inlet the adjustment that cold First air carries out wind-warm syndrome.Cause and reduced by the primary air flow of air preheater, cause exhaust gas temperature to rise, boiler efficiency declines.Under SCR generally puts present situation into operation, air preheater dust stratification, corrosion phenomenon are day by day serious, and generate ammonium hydrogen sulfate because the escaping of ammonia and ammonia react with sulfuric acid vapor, ammonium hydrogen sulfate condenses at air preheater cold surface at a certain temperature, causes ammonium salt type to condense.On the other hand, after flue gas flows through SCR catalyst, SO3 content rises more than 30%, causes sulfuric acid type cold end corrosion to aggravate.

After the generally use of SCR, low-temperature corrosion of air preheater and clogging phenomenon are even more serious than before, and many southern power plant have no alternative but again to drop into steam air heater and run, some northern power plant even summer steam air heater still come into operation.

Chinese patent CN101709876A discloses a kind of system for deep cooling and waste heat recovery of smoke gas in boiler, comprises the independent water circulation system of cryocooler, steam air heater and composition thereof.Chinese patent CN101709879A discloses a kind of coal steam-electric plant smoke complex optimum smoke discharging residual heat degree of depth recovery system.Above-mentioned two schemes utilize gas cooler Mist heat recovering, and device is installed in tail flue gas, there is the defects such as burn into dust stratification, wearing and tearing.

Chinese patent CN102252339A discloses a kind of system reducing discharge smoke temperature of power station boiler.Adopt heat primary air to heat cold Secondary Air, flue duct bypass is set and extracts part of smoke heating low pressure feed water out, under ensureing the prerequisite of secondary air temperature, reduce exhaust gas temperature.This scheme owing to reducing exhaust gas temperature, and then reduces air preheater cold-end air wall temperature, has increased the weight of cold end corrosion phenomenon.On the other hand, carried out the adjustment of heat power by the water yield, adjusting function and response speed are all poor, do not reach the object adjusted coal pulverizer inlet wind-warm syndrome in time, affect pulverized coal preparation system and exert oneself.

Chinese patent CN103438686A discloses First air cooler heat regenerative system and control method; Heat one this wind pipeline installs cooler additional, by low adding system feedwater heat of cooling First air cooler.Coal pulverizer inlet desiccant temperature demand is met by regulating cooling water flow.Secondary scheme only considered energy recovery problem, does not consider to be coupled with steam air heater use problem.In addition control method performance and response speed are all poor, do not reach the effect of adjustment coal pulverizer inlet wind-warm syndrome in time, affect pulverized coal preparation system and exert oneself.

Summary of the invention

The present invention is for making up the deficiencies in the prior art, provide a kind of heat primary air residual heat using device used with steam air heater system, coupled, this device can be avoided mixing cold wind to pulverized coal preparation system, absorbs heat primary air waste heat and gets back to heat regenerative system summer, improve unit cycle efficieny; Make steam air heater thermal source winter, improve air preheater EAT, reduce the auxiliary vapour steam consumption of steam air heater, improve unit efficiency.Under the prerequisite not raising exhaust gas temperature, improve air preheater cold junction wall temperature, reduce the generation of cold end corrosion and fouling phenomenon.

Meanwhile, the present invention also provides the progress control method being applicable to summer in winter two cover system.

The present invention adopts following technical scheme:

The heat primary air residual heat using device used with steam air heater system, coupled, in boiler air preheater outlet heat primary air road, heat primary air cooler and damper are installed, bypass air channel is arranged in parallel in the entry and exit, main road air channel at heat primary air cooler place, bypass also arranges damper in air channel, carries out the adjustment of heat power by regulating adjustment doors in bypass air channel and main road air channel; Heat primary air cooler connects the female pipe of water inlet and backwater mother pipe.Residual neat recovering system comprises two cover systems, correspond respectively to summer and winter mode of operation.Two cover systems are parallel to heat primary air cooler and enter backwater mother pipe.

The water inlet mother pipe of heat primary air cooler is connected cooling medium residual neat recovering system with the female pipe of backwater, this system comprises summer operation system, during by summer mode system cloud gray model, cooler cooling medium selects boiler heat regenerative system condensate water, oxygen-eliminating device entrance is got back to by the condensate water after the heating of heat primary air cooler, squeeze low adding system to draw gas, increase steam turbine work done, improve unit efficiency.Spring, autumn run same summer.

Summer operation system and winter work system be parallel to heat primary air cooler and intake and female manage with backwater between female pipe and isolation door is set respectively, isolate with another input coefficient, two cover systems have the regulating system of correspondence with it respectively.Summer operation system fading margin cooling water return water temperature, comprise the isolation door and backwater adjustment doors that are connected by water return pipeline, and inlet pipeline and isolation door thereof, inlet pipeline one end connects the female pipe of water inlet, other end connection is low adds heat exchanger, water return pipeline one end connects backwater mother pipe, the other end connects oxygen-eliminating device, by the adjustment regulating CWR road flow control valve and backwater adjustment doors to carry out return water temperature.Summer, system comprised two regulating system, arranged bypass, main road air channel damper and CWR road flow control valve.Regulating system one is thermal power regulating system, the adjustment of heat power is carried out by regulating adjustment doors in bypass, main road air channel, regulating system two is cooling water return water temperature adjustment System, by the adjustment regulating CWR road flow control valve to carry out return water temperature.

The cooling medium residual neat recovering system of heat primary air cooler, also comprise work system in winter, during by winter mode system cloud gray model, cooling medium is the condensate water or demineralized water that quality is qualified, installs hot water steam air heater and relevant pipe-line system, circulating pump etc. in pressure fan or primary air fan outlet conduits.Cooling medium is cycle heat exchange between heat primary air cooler and hot water steam air heater, plays the effect of steam air heater, reduces heat primary air temperature, improves air preheater entering air temperature.

Further, winter, work system comprised the hot water steam air heater being arranged on a cold air channel, be connected to the pipeline between hot water steam air heater and the female pipe of backwater and circulating pump, isolation door, and the isolation door being connected to hot water steam air heater and intaking between female pipe, by the adjustment regulating frequency variable circulating pump rotating speed to carry out flow and circulating water temperature, and then auxiliary adjustment heat power.Winter, the adjustment of system thermal power comprised main and auxiliary regulating system, arranged bypass air channel adjustment doors and frequency variable circulating pump.Main regulation system carries out the adjustment of heat power by regulating adjustment doors in bypass, main road air channel, the adjustment of auxiliary adjustment system by regulating variable frequency pump rotating speed to carry out flow and circulating water temperature, and then auxiliary adjustment heat power.

Further, described heat primary air cooler and hot water steam air heater are the object ensureing to avoid dust stratification and strengthen heat transfer, are designed to special shape finned heat exchanger.

Further, winter, work system adopted closed cycle, comprise voltage stabilizing water intake system, namely the little bypass of the low constant voltage adding heat exchanger and intake between female pipe and the little bypass door of constant voltage is connected to, dry point is arranged in that certain one-level of steam turbine low pressure feed water heat regenerative system is low adds heat exchanger exit pipeline, plays the effect of stable circulation pump inlet pressure.Described winter, closed circulation system comprised voltage-stabilizing system, namely drew constant voltage water bypass and pump intake conducting by system appropriate location at a low price, played the effect of stable pump inlet pressure.

One time wind-warm syndrome regulates concrete adjustment process as follows:

(1) first regulate heat primary air valve and cold First air valve, make coal pulverizer inlet wind-warm syndrome meet the demand of drying capacity.

(2) standard-sized sheet bypass damper, complete shut-down heat primary air cooler air channel Internal baffle, system carries out water in cold conditions, suitably opens backwater adjustment doors and ensure that system crosses water during summer operation; ON cycle water pump during winter operation, water pump slow speed runs, and the system of guarantee crosses water.

(3) slowly closing bypass windshield plate, slowly open heat primary air cooler air channel barrier simultaneously, system starts to pass into hot blast and runs, and now adjusts backwater adjustment doors (summer) or pump revolution (winter) and to intake the adjustment of return water temperature, require that return water temperature is oxygen-eliminating device inflow temperature summer; Require that return water temperature is design temperature of return water winter.

(4) along with the input of heat primary air cooler, coal pulverizer inlet wind-warm syndrome starts to decline, and now closes slow cold-air flap, and regulate bypass windshield plate until cold-air flap complete shut-down, coal pulverizer inlet temperature within the required range.

The present invention, by installing heat primary air cooler in heat primary air air channel, avoids pulverized coal preparation system to mix cold wind and runs.Summer fever First air waste heat is got back to and is lowly added heat regenerative system, and squeezing draws gas increases steam turbine work done, and flowing through air preheater air quantity increases, and reduces exhaust gas temperature, improves unit cycle efficieny.Compared with traditional gas cooler, because heat exchanger is installed on hot blast side, avoid heat exchanger and be installed on some row problems such as dust stratification, wearing and tearing, corrosion that fume side brings, simultaneously because heat transfer temperature difference is much larger than gas cooler, unit heat power drop into cool it far below flue gas and recovery waste heat quality higher than gas cooler.Winter, waste heat was as steam air heater thermal source, can the auxiliary vapour consumption of Some substitute steam warming machine, reduce the auxiliary vapour of former steam air heater to draw gas, compared with traditional steam air heater, significantly improve air preheater cold-end air wall temperature not improving exhaust gas temperature situation, alleviate air preheater corrosion and fouling phenomenon, improve unit efficiency.

Scheme provided by the invention is applicable to the coal unit that pulverized coal preparation system mixes cold wind operation.

Accompanying drawing explanation

Fig. 1 is present system schematic diagram (this figure is that hot water steam air heater installs additional and a cold air channel, and power plant can install secondary air duct according to actual needs additional or two points of storehouse air preheaters are installed in total air channel).

In figure, 1 heat primary air road, 2,3 dampers, 4 heat primary air coolers, 5 hot water-warming blower fans, 6,7,9,10 isolation doors, 8 circulating pumps, 11 backwater adjustment doors, the little bypass door of 12 constant voltage, 13 air preheaters, 14 flues, 15 secondary air ducts, 16 air channels, 17 condensate pumps, 18 oxygen-eliminating devices, 19 lowly add heat exchanger, 20 coal pulverizer inlets, 21 bypass air channels, 22 backwater mother pipes, the female pipe of 23 water inlet.

Detailed description of the invention

Accompanying drawing is a kind of specific embodiment of the present invention.

See Fig. 1, the heat primary air residual heat using device that a kind of and steam air heater system, coupled that example of the present invention provides uses is installed in Thermal generation unit therrmodynamic system, and main equipment is primarily of First air cooler body 4, formation such as damper 2,3 grade; Water lines under summer, winter two kinds of mode of operations is parallel to First air cooler 4 body.Heat primary air cooler connects the female pipe 23 of water inlet and the female pipe 22 of backwater.Wherein, heat primary air cooler 4 and damper 3 thereof are arranged in boiler air preheater outlet main road air channel, heat primary air road and (also can be installed in bypass according to site specific, in heat primary air cooler body entrance and bypass air channel, damper is installed), in bypass air channel, damper 2 is installed, main road air channel is in parallel with bypass air channel, carries out the adjustment of heat power by regulating adjustment doors in bypass air channel and main road air channel.

Summer operation water system is in parallel with low-pressure heater, comprises backwater adjustment doors 11, isolation door 9, isolation door 10 and relevant temperature, pressure, flow measuring point etc.Specifically, summer operation system fading margin cooling water return water temperature, comprise the isolation door and backwater adjustment doors that are connected by water return pipeline, and inlet pipeline and isolation door thereof, inlet pipeline one end connects the female pipe of water inlet, other end connection is low adds heat exchanger, water return pipeline one end connects backwater mother pipe, the other end connects oxygen-eliminating device, by the adjustment regulating CWR road flow control valve and backwater adjustment doors to carry out return water temperature.Spring, autumn run same summer.

Winter, mode of operation system comprised the formations such as hot water steam air heater body 5, isolation door 6, isolation door 7, circulating pump 8, the little bypass of constant voltage, the little bypass door 12 of constant voltage and corresponding measuring point.

Specifically, winter, work system comprised the hot water steam air heater being arranged on a cold air channel, be connected to the pipeline between hot water steam air heater and the female pipe of backwater and circulating pump, isolation door, and the isolation door being connected to hot water steam air heater and intaking between female pipe, by the adjustment regulating frequency variable circulating pump rotating speed to carry out flow and circulating water temperature, and then auxiliary adjustment heat power.Winter, work system adopted closed cycle, comprise voltage stabilizing water intake system, namely the little bypass of the low constant voltage adding heat exchanger and intake between female pipe and the little bypass door of constant voltage is connected to, dry point is arranged in that certain one-level of steam turbine low pressure feed water heat regenerative system is low adds heat exchanger exit pipeline, plays the effect of stable circulation pump inlet pressure.

Concrete, during summer operation, isolation door 6,7 and the little bypass valve 12 of constant voltage are closed, circulating pump 8 off-the-line.Isolation door 9,10 is opened, and First air cooler low-temperature receiver dry point is arranged in certain one-level feed-water heater outlet conduit of steam turbine low pressure feed water heat regenerative system, and backed-up water level is set to oxygen-eliminating device entrance feedwater piping.Feedwater is flow through heat exchanger by stage head and is absorbed First air waste heat, squeezes low adding system in parallel with it and draws gas, improve cycle efficieny.Water side return water temperature is adjusted by backwater adjustment doors 11, and low to add feed temperature identical with entering oxygen-eliminating device for adjustment return water temperature.Coal pulverizer inlet wind-warm syndrome is by body and bypass damper 2, and 3 adjust.

Concrete, during winter operation, isolation door 9,10 is closed, water in system is carried out by the little bypass door 12 of constant voltage, isolation door 6,7 is opened, hot water steam air heater 5 drops into, and cooling medium is the condensate water that quality is qualified, by installing hot water steam air heater 5 and relevant pipe-line system, circulating pump 8 etc. in pressure fan or primary air fan outlet conduits.Cooling medium is cycle heat exchange between cooler and hot water steam air heater, plays the effect of steam air heater.

One time wind-warm syndrome regulates concrete adjustment process as follows:

(2) standard-sized sheet bypass air door damper 2, damper 3 in complete shut-down heat primary air cooler air channel, system carries out water in cold conditions (carrying out upper water with suppressing little bypass door 11).Suitably open backwater adjustment doors 11 during summer operation and ensure that system crosses water; ON cycle water pump during winter operation, water pump slow speed runs, and the system of guarantee crosses water.

(3) slowly closing bypass wind damper 2, slowly open heat primary air cooler air channel damper 3 simultaneously, system starts to pass into hot blast and runs, now adjust backwater adjustment doors 11(summer) or circulating pump 8 revolution (winter) to intake the adjustment of return water temperature, require that return water temperature is oxygen-eliminating device inflow temperature summer; Require that return water temperature is design temperature of return water winter.

(4) along with the input of heat primary air cooler, coal pulverizer inlet wind-warm syndrome starts to decline, and now closes slow cold-air flap, and regulate bypass wind air door 2 until cold-air flap complete shut-down, coal pulverizer inlet temperature within the required range.

During winter operation, constant voltage little bypass 12 First air standard-sized sheet, secondary door is opened 2 to 3 and is ensured that system pressure is stablized.

Can exhaust gas temperature be reduced when native system summer operation is installed, improve unit cycle efficieny.Can be used as steam air heater winter to use, significantly promoting air preheater cold-end air wall temperature when not improving exhaust gas temperature, the phenomenon such as mitigate corrosion and dust stratification, ensure that air preheater stability and safety is run.This regulating system fast response time, can meet pulverized coal preparation system coal and the demand of coal amount change to wind-warm syndrome.

Meanwhile, heat primary air cooler is installed in the heat primary air road of air preheater outlet, and thermal source is the hot-air containing a small amount of dust, compared with gas cooler, there is not burn into wearing and tearing and fouling phenomenon.

Claims

1. the heat primary air residual heat using device used with steam air heater system, coupled, it is characterized in that, in boiler air preheater outlet heat primary air road, heat primary air cooler and damper are installed, bypass air channel is arranged in parallel in the entry and exit, main road air channel at heat primary air cooler place, bypass also arranges damper in air channel, carries out the adjustment of heat power by regulating adjustment doors in bypass air channel and main road air channel; Heat primary air cooler connects the female pipe of water inlet and backwater mother pipe.

2. the heat primary air residual heat using device used with steam air heater system, coupled according to claim 1, it is characterized in that, the water inlet mother pipe of heat primary air cooler is connected cooling medium residual neat recovering system with the female pipe of backwater, this system comprises summer operation system, during by summer mode system cloud gray model, cooler cooling medium selects boiler heat regenerative system condensate water.

3. the heat primary air residual heat using device used with steam air heater system, coupled according to claim 2, it is characterized in that, the cooling medium residual neat recovering system of heat primary air cooler, also comprise work system in winter, during by winter mode system cloud gray model, cooling medium is the condensate water or demineralized water that quality is qualified, installs hot water steam air heater and pipe-line system, circulating pump in pressure fan or primary air fan outlet conduits; Cooling medium is cycle heat exchange between heat primary air cooler and hot water steam air heater.

4. the heat primary air residual heat using device used with steam air heater system, coupled according to claim 3, it is characterized in that, summer operation system and winter work system be parallel to heat primary air cooler female pipe of intaking and also isolation door be set respectively with backwater between female pipe, isolate with another input coefficient, two cover systems have regulating system corresponding with it respectively.

5. a kind of heat primary air residual heat using device used with steam air heater system, coupled according to claim 2, it is characterized in that, summer operation system, comprise the isolation door and backwater adjustment doors that are connected by water return pipeline, and inlet pipeline and isolation door thereof, inlet pipeline one end connects the female pipe of water inlet, other end connection is low adds heat exchanger, and water return pipeline one end connects backwater mother pipe, the other end connects oxygen-eliminating device.

6. a kind of heat primary air residual heat using device used with steam air heater system, coupled according to claim 3, it is characterized in that, winter, work system comprised the hot water steam air heater being arranged on a cold air channel, be connected to the pipeline between hot water steam air heater and the female pipe of backwater and circulating pump, isolation door, and the isolation door being connected to hot water steam air heater and intaking between female pipe.

7. a kind of heat primary air residual heat using device used with steam air heater system, coupled according to claim 3, it is characterized in that, winter, work system adopted closed cycle, comprise voltage stabilizing water intake system, namely be connected to the little bypass of the low constant voltage adding heat exchanger and intake between female pipe and the little bypass door of constant voltage, dry point is arranged in that certain one-level of steam turbine low pressure feed water heat regenerative system is low adds heat exchanger exit pipeline.