CN206810050U - A kind of flue gas of wet desulphurization disappears white system - Google Patents
A kind of flue gas of wet desulphurization disappears white system Download PDFInfo
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- CN206810050U CN206810050U CN201720168606.5U CN201720168606U CN206810050U CN 206810050 U CN206810050 U CN 206810050U CN 201720168606 U CN201720168606 U CN 201720168606U CN 206810050 U CN206810050 U CN 206810050U
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Abstract
A kind of flue gas of wet desulphurization disappears white system, is related to flue gas desulfurization and flue gas eliminating white smoke process system and method, including flue gas cool-down heat exchanger, the desulfurizing tower, flue gas temperature rise heat exchanger and the heating agent water circulation system that are equipped with slurries cooler；In flue gas cool-down heat exchanger, the waste heat of heat medium water recovered flue gas simultaneously reduces flue-gas temperature, and dedusting and desulfuration efficiency can be improved after flue gas cool-down；In slurries cooler, the cooled cooling of desulfurization slurry, the slurries after cooling be used for flue gas it is wet remove, desulfurization；In flue gas temperature rise heat exchanger, the heat medium water for having reclaimed fume afterheat carries out heating heating to flue gas after desulfurization, increases the degree of superheat；The utility model eliminates flue gas white cigarette while improving desulfuration efficiency, and reduces the investment of whole desulfurizing technology system.
Description
Technical field
It the utility model is related to flue gas desulfurization application field, more particularly to a kind of flue gas of wet desulphurization disappears white system.
Background technology
Promulgated with national environmental protection portion《Fossil-fuel power plant atmospheric pollutant emission standard》(GB13226-2011) reality
Apply, it is desirable to which coal-burning boiler dust emission standard reaches 30mg/Nm3, SO2Content is distinguished control by newly-built and existing power plant and existed
100mg/m3、200mg/m3, key area flue dust and SO from now on2Discharge capacity is controlled in 20mg/m3,50mg/m3.It is more and more stricter
Atmosphere pollutants emission standardses, force coal-burning power plant and other coal-burning boiler enterprises to need to change flue gas emission
Make, to meet ultra-clean emission request.
Coal-burning boiler produces a large amount of dust, sulfur dioxide, sulfur trioxide and nitrogen in process of production using coal as the energy
Oxide, at present, coal-burning boiler generally carry out flue gas desulfurization processing using Gypsum Wet technology.
However, problems with is still suffered from using the flue gas after Gypsum Wet technology desulfurization：
(1) after desulfurization, still sulphur is formed with the condensed water of precipitation containing a certain amount of sulfur dioxide, sulfur trioxide in flue gas
Acid and sulfurous acid, corrosion is produced to flue and chimney.
(2) desulfurization fume outlet water capacity is big, entrainment gypsum particle, and in discharge process, flue-gas temperature reduces, in flue gas
Elutriation goes out, chimney periphery formed " gypsum rain ", " white haze " phenomena such as, cause unnecessary economic loss and environmental problem.
In recent years, in order to solve the above problems, the flue gas temperature rise heat exchanger between desulfurizing tower and chimney, by lifting flue gas
Temperature solves in flue gas corrosion caused by condensation of moisture and " gypsum rain " problem, but effect is all not so good, is primarily due to：
(1) actual sulfur-bearing emission inventory is not reduced, and the pollution to environment is not taken on a new look；
(2) the gypsum solid particle that flue gas carries, flue gas temperature rise heat exchanger is caused to block；
(3) to avoid condensation of moisture in flue gas, it is necessary to which flue-gas temperature is substantially improved, flue gas temperature rise heat exchanger thermic load is caused
It is huge；
(4) flue gas temperature rise heat exchanger is bulky, and existing apparatus space is limited, and improvement cost is high.
Utility model content
In sweetening process, slurry temperature has considerable influence to desulfuration efficiency, and slurry temperature is lower, and sulfur dioxide is in slurries
In solubility it is bigger, overall mass transfer coefficient is also bigger, i.e., desulfuration efficiency is higher.The temperature of desulfurization slurry is reduced, can effectively be dropped
Low desulfurization exit gas temperature, the spray flux of desulfurization slurry is reduced, further reduce the gypsum solid of humidity of flue gas and entrainment
Particle.Simultaneously as humidity of flue gas reduces, the thermic load of flue gas temperature rise heat exchanger is greatly reduced, and can significantly reduce equipment
Volume, control improvement cost.
At the same time, by heating agent, the flue gas heating agent before desulfurization is utilized in flue gas cool-down heat exchanger, in flue gas liter
The warm heat exchanger flue gas after the middle desulfurization using heating medium for heating again, realizes heat energy recycling.
Based on above-mentioned principle, the utility model is using the side for reducing desulfurization slurry temperature joint flue gas-heat medium circulating heat exchange
Formula, content of sulfur dioxide in flue gas after desulfurization is on the one hand reduced by desulfuration efficiency lifting, by reducing desulfurization slurry consumption
Slurries entrainment in flue gas is reduced, the water capacity of flue gas after desulfurization is reduced by reducing flue-gas temperature, utilizes flue gas before desulfurization
Flue gas after energy heats desulfurization, the precipitation of aqueous vapor in flue gas is avoided, and then realize and eliminated " in vain on the basis of ultra-clean discharge
The problems such as mist ", " gypsum rain ", and flue gas temperature rise heat exchanger thermic load is reduced, reduce heat exchanger volume and improvement cost.Meanwhile
The utility model further reduces heat exchanger volume using straight channel flue gas heat-exchange unit with straight channel desulfurization slurry heat exchanger, is lifted
The global reliability and economy of system.
To sum up, the utility model has following innovative：
1) by reducing desulfurization slurry temperature, desulfuration efficiency is lifted；
2) by reducing flue gas after desulfurization temperature, flue gas after desulfurization water capacity is reduced；
3) desulfuration efficiency improves, and the consumption of desulfurization slurry declines；
4) flue gas after desulfurization gypsum particle entrainment is reduced；
5) flue gas heat lifts flue gas after desulfurization temperature before utilizing desulfurization；
6) flue gas temperature rise heat exchanger thermic load is small, small volume, and improvement cost is low.
The utility model is to be achieved by the following technical programs：
A kind of flue gas of wet desulphurization disappears white system, it is characterised in that the flue gas cool-down heat exchange passed sequentially through including flue gas
Device, desulfurizing tower, flue gas temperature rise heat exchanger and chimney, wherein,
Heating agent water-flow circuit, the flue gas cool-down are provided between the flue gas cool-down heat exchanger and flue gas temperature rise heat exchanger
The low-temperature receiver media channel of heat exchanger passes through flue gas by heat medium water, the thermal source media channel of flue gas cool-down heat exchanger；Flue gas heats up
The thermal source media channel of heat exchanger is by heat medium water, cigarette that the low-temperature receiver media channel of flue gas temperature rise heat exchanger is discharged by desulfurizing tower
Gas, the flue gas of flue gas temperature rise heat exchanger discharge are passed through chimney and discharged；
The desulfurizing tower includes smoke inlet, exhanst gas outlet, located at the slurry storage pond of bottom and the multilayer located at top
Slurries spray equipment, the smoke inlet are located between slurry storage pond and multilayer slurries spray equipment, changed by flue gas cool-down
The flue gas of hot device enters desulfurizing tower from smoke inlet, and exhanst gas outlet is above multilayer slurries spray equipment, the slurry storage
A plurality of slurries spray pipeline is provided between pond side wall and multilayer slurries spray equipment, the entrance of a plurality of slurries spray pipeline is arranged on
Slurry storage bottom of pond portion, the outlet of a plurality of slurries spray pipeline arrange upwards successively along desulfurizing tower, wherein corresponding outlet is most upper
The slurries spray pipeline at end is provided with slurry heat exchanger, and the low-temperature receiver media channel of slurry heat exchanger is by cold media, to being passed through slurry
Slurries cooling in the logical slurries spray pipeline of the thermal source medium of liquid heat exchanger.
The heating agent water-flow circuit is provided with the heater for heat medium water concurrent heating in flue gas temperature rise heat exchanger front end.
The heating agent water-flow circuit is provided with the heat collector for heat medium water cooling in flue gas cool-down heat exchanger rear end.
Circulating pump and constant pressure supply water system are provided with the heating agent water-flow circuit.
The slurry heat exchanger, flue gas cool-down heat exchanger, flue gas temperature rise heat exchanger are straight channel plank frame heat exchanger,
The heat transfer element of the straight channel plank frame heat exchanger is corrugated cardboard sheet, and the slurries side ripple's depth of the corrugated cardboard sheet is less than
Slurries side sheet room runner.
A kind of flue gas of wet desulphurization disappears whitening method, comprises the following steps：
(1) flue gas is passed through flue gas cool-down heat exchanger, flue gas cool-down heat exchanger heats for heat medium water, while is dropped for flue gas
Temperature；
(2) flue gas after cooling in step (1) is passed through in desulfurizing tower, the desulfurization slurry heat exchanger in desulfurizing tower is by desulfurization
Slurries cool down, and the flue gas after the desulfurization slurry and cooling after cooling carries out haptoreaction, realizes low-temp desulfurization and the dehumidifying of flue gas
Process；
(3) desulfurization in step (2) and the flue gas after dehumidifying are passed through flue gas temperature rise heat exchanger, flue gas temperature rise heat exchanger utilizes
The heat medium water after heating in step (1) heats up for flue gas, and it is white to realize that flue gas disappears, and will heat up rear flue gas and arranged by chimney
Go out, the heating agent coolant-temperature gage after heat exchange reduces, and it is flue gas cool-down to be conducted into flue gas cool-down heat exchanger；
The beneficial effects of the utility model are：
The utility model reduces slurry temperature and improves desulfuration efficiency, set up low-temperature zone flue gas by setting up slurry heat exchanger
Heat exchanger, flue gas cool-down heat exchanger, exhaust gas temperature is improved, realizes following beneficial effect：
1) slurry temperature is lower, and flue gas desulfurization effect is better, and therefore, it is de- that it can be substantially improved in reduction desulfurization slurry temperature
Sulphur efficiency；
2) slurry temperature is reduced, it is possible to reduce the saturated vapor and Liquid water content that flue gas carries；
3) the gypsum particle content in flue gas is reduced, reduces the risk that flue gas heat-exchange unit blocks；
4) the steam entrainment of reduction is settled down to the slurry pool of desulfurizing tower bottom in flue gas after condensing, and on the one hand reduces desulfurization
The water consumption of slurries, washing, purifying effect is on the other hand played to the dust in flue gas, effectively reduces the dust in smoke evacuation
Content.
5) humidity of flue gas, gypsum particle and dust are reduced, is inherently eliminated " gypsum rain "；
6) flue gas temperature rise heat exchanger lifts less temperature with regard to that can meet environmental requirement, and corresponding flue gas cool-down exchanger heat is born
Lotus also reduces, and reduces floor space, reduces cost.
7) heat of flue gas by flue gas cool-down heat exchanger reclaim and used by flue gas temperature rise heat exchanger before desulfurization
In heating flue gas after desulfurization, effective recycling of fume afterheat, energy-conservation environmental protection again are realized.
8) straight channel plank frame slurry heat exchanger and flue gas heat-exchange unit are used, can effectively be prevented on the premise of ensureing to conduct heat
Only slurries block with flue gas in heat exchanger.
Brief description of the drawings
Fig. 1 is attachment structure schematic diagram of the present utility model.
Fig. 2, Fig. 3, Fig. 4 are the attachment structure schematic diagram of three kinds of preferred embodiments of the present utility model respectively.
In figure：1. slurry storage pond, 2. slurries spray equipments.
Embodiment
In order that those skilled in the art more fully understand the technical solution of the utility model, below in conjunction with the accompanying drawings
The utility model is described in further detail with most preferred embodiment.
Heated up as shown in figure 1, the utility model includes flue gas cool-down heat exchanger, desulfurizing tower, the flue gas that flue gas passes sequentially through
Heat exchanger and chimney, wherein,
Heating agent water-flow circuit, the flue gas cool-down are provided between the flue gas cool-down heat exchanger and flue gas temperature rise heat exchanger
The low-temperature receiver media channel of heat exchanger passes through flue gas by heat medium water, the thermal source media channel of flue gas cool-down heat exchanger；Flue gas heats up
The thermal source media channel of heat exchanger is by heat medium water, cigarette that the low-temperature receiver media channel of flue gas temperature rise heat exchanger is discharged by desulfurizing tower
Gas, the flue gas of flue gas temperature rise heat exchanger discharge are passed through chimney and discharged；
Desulfurizing tower includes smoke inlet, exhanst gas outlet, located at the slurry storage pond 1 of bottom and the multilayer slurries located at top
Spray equipment 2, the smoke inlet are located between slurry storage pond and multilayer slurries spray equipment, pass through flue gas cool-down heat exchanger
Flue gas enter desulfurizing tower from smoke inlet, exhanst gas outlet is above multilayer slurries spray equipment；
A plurality of slurries spray pipeline, a plurality of slurries spray are provided between slurry storage pond side wall and multilayer slurries spray equipment
The entrance of pipeline is arranged on slurry storage bottom of pond portion, and the outlet of a plurality of slurries spray pipeline arranges upwards successively along desulfurizing tower, its
Middle corresponding outlet is provided with slurry heat exchanger on the slurries spray pipeline of the top, and the low-temperature receiver media channel of slurry heat exchanger passes through
Cold media, the slurries in the logical slurries spray pipeline of thermal source medium to being passed through slurry heat exchanger cool.
Slurries in desulfurizing tower, which flow to, is：Slurries in slurry storage pond are transported to desulfurization by a plurality of slurries spray pipeline
The multilayer slurries spray equipment on tower top, the slurries sprayed out are to flue gas desulfurization, while slurries flow back into slurry storage pond.
Slurry heat exchanger is located at outlet in the slurries spray pipeline of the top, and the heat exchange drop of the slurries to wherein flowing through
Temperature, waste heat is exported and recycled；Smoke contacts of the slurries of cooling directly with top, because its temperature is relatively low,
Heat and mass effect strengthens, and desulfurized effect greatly improves, and reduces steam entrainment and sulfur content in discharge flue gas.
Preferably, slurry heat exchanger, flue gas cool-down heat exchanger, flue gas temperature rise heat exchanger are changed from straight channel plank frame
Hot device.The heat transfer element of straight channel plank frame heat exchanger is corrugated cardboard sheet, and plate groups poststack is formed in slurries side or fume side
Contactless board-like straight-through runner.Can thoroughly solve particulate matter blocking and fouling problem.
Flue-gas temperature is reduced to 90 DEG C or so by flue gas cool-down heat exchanger in actual moving process, is driven by slurry circulating pump
Loop slurry be situated between by slurry heat exchanger and circulating refrigerant and exchange heat, the waste heat that slurries reclaim is reclaimed profit by slurry heat exchanger
With；The slurries of cooling are directly with the smoke contacts after top cooling, and because both temperature are all relatively low, heat and mass effect increases
By force, desulfurized effect greatly improves, and reduces steam entrainment and sulfur content in discharge flue gas.The heating agent driven by heating agent water-circulating pump
The thermal source that flue gas cool-down heat exchanger reclaims is delivered to flue gas temperature rise heat exchanger by water circulation pipe, lifts the flue gas temperature of chimney entrance
Degree, reduces its relative humidity, is inherently eliminated environmental problems such as " gypsum rains ".
One of which embodiment of the present utility model by afterburner as shown in Fig. 2 be arranged at flue gas cool-down heat exchanger exit
On heating agent water circulation pipe between flue gas temperature rise heat exchanger entrance.
The main purpose for setting steam afterburner is that heat caused by the lifting not enough of replenishment system chimney entrance flue gas temperature is negative
Lotus is lacked, and system is driven and can use low-pressure steam supplement thermic load during underrun.
One of which embodiment of the present utility model by heat collector as shown in figure 3, be arranged at flue gas cool-down heat exchanger exit
On heating agent water circulation pipe between flue gas temperature rise heat exchanger entrance.
The purpose of heat collector is set when being boiler heavy-duty service, the heat for being imbued with flue gas cool-down heat exchanger using heat collector
Load is used for preboiler condensate or heating steam air heater.
In addition, in actual production, the heat medium water between flue gas cool-down heat exchanger exit and flue gas temperature rise heat exchanger entrance follows
Steam afterburner and heat collector can be set simultaneously on endless tube road.Both relative positions are determined according to actual conditions, according to control
System processed automatically turns on or steam off afterburner and heat collector, reaches system heat balance.Another implementation of the present utility model
Such as shown in Fig. 4, both situations are set simultaneously as on heating agent water circulation pipe.
Heat collector and afterburner in this example can still use heat exchanger, and being used as thermal source by concurrent heating medium in afterburner is
Heat medium water heats up；By taking thermal medium to be used as low-temperature receiver for heat medium water cooling temperature in heat collector；
In flue gas cool-down heat exchanger, the waste heat of heat medium water recovered flue gas simultaneously reduces flue-gas temperature, can be carried after flue gas cool-down
High dedusting and desulfuration efficiency；In slurries cooler, the cooled cooling of desulfurization slurry, the slurries after cooling are used for the wet of flue gas
Remove, desulfurization；In flue gas temperature rise heat exchanger, the heat medium water for having reclaimed fume afterheat carries out heating heating to flue gas after desulfurization, increases
Add the degree of superheat；The utility model, by reducing flue-gas temperature, improves flue gas ash removal and wet desulphurization effect first with heat medium water
Rate, secondly, using slurries cooler cool slurry temperature, reduce water consumption and desulfurization slurry consumption in flue gas desulfurization course,
Humidity of flue gas is reduced while smoke desulfurization efficiency is improved, and then reduces the thermic load of flue gas temperature rise heat exchanger, then
It is secondary, using heat medium water, heating heating is carried out to flue gas after desulfurization by flue gas temperature rise heat exchanger, and then it is white to realize that flue gas desulfurization disappears
Purpose, compared with traditional flue gas wet desulphurization process system, the utility model improve desulfuration efficiency while eliminate cigarette
Gas white cigarette, and reduce the investment of whole desulfurizing technology system.
Described above is only preferred embodiment of the present utility model, it is noted that for the common skill of the art
For art personnel, on the premise of the utility model principle is not departed from, some improvements and modifications can also be made, these improve and
Retouching also should be regarded as the scope of protection of the utility model.
Claims (5)
- The white system 1. a kind of flue gas of wet desulphurization disappears, it is characterised in that including flue gas cool-down heat exchanger, be equipped with slurry heat exchanger Desulfurizing tower, flue gas temperature rise heat exchanger and chimney, flue gas cool-down heat exchanger that flue gas passes sequentially through, desulfurizing tower, flue gas heating are changed Hot device, chimney, wherein,Heating agent water-flow circuit, the flue gas cool-down heat exchange are provided between the flue gas cool-down heat exchanger and flue gas temperature rise heat exchanger The low-temperature receiver media channel of device passes through flue gas by heat medium water, the thermal source media channel of flue gas cool-down heat exchanger；Flue gas heating heat exchange The thermal source media channel of device is by heat medium water, flue gas that the low-temperature receiver media channel of flue gas temperature rise heat exchanger is discharged by desulfurizing tower, The flue gas of flue gas temperature rise heat exchanger discharge is passed through chimney and discharged；The desulfurizing tower includes smoke inlet, exhanst gas outlet, located at the slurry storage pond of bottom and the multilayer slurries located at top Spray equipment, the smoke inlet are located between slurry storage pond and multilayer slurries spray equipment, pass through flue gas cool-down heat exchanger Flue gas enter desulfurizing tower from smoke inlet, exhanst gas outlet is above multilayer slurries spray equipment, slurry storage pond side A plurality of slurries spray pipeline is provided between wall and multilayer slurries spray equipment, the entrance of a plurality of slurries spray pipeline is arranged on slurries Storage pool bottom, the outlet of a plurality of slurries spray pipeline arrange upwards successively along desulfurizing tower, wherein corresponding outlet is in the top Slurries spray pipeline is provided with slurry heat exchanger, and the low-temperature receiver media channel of slurry heat exchanger is changed being passed through slurries by cold media Slurries cooling in the logical slurries spray pipeline of the thermal source medium of hot device.
- The white system 2. a kind of flue gas of wet desulphurization according to claim 1 disappears, it is characterised in that the heating agent water circulation Loop is provided with the heater for heat medium water concurrent heating in flue gas temperature rise heat exchanger front end.
- The white system 3. a kind of flue gas of wet desulphurization according to claim 1 or 2 disappears, it is characterised in that the heat medium water Circulation loop is provided with the heat collector for heat medium water cooling in flue gas cool-down heat exchanger rear end.
- The white system 4. a kind of flue gas of wet desulphurization according to claim 3 disappears, it is characterised in that the heating agent water circulation Circulating pump and constant pressure supply water system are provided with loop.
- The white system 5. a kind of flue gas of wet desulphurization according to claim 4 disappears, it is characterised in that the slurries heat exchange Device, flue gas cool-down heat exchanger, flue gas temperature rise heat exchanger are straight channel plank frame heat exchanger, the straight channel plank frame The heat transfer element of heat exchanger is corrugated cardboard sheet, and the slurries side ripple's depth of the corrugated cardboard sheet is less than slurries side sheet room runner.
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