CN107213738A - A kind of damp and hot tail gas treatment process and system - Google Patents
A kind of damp and hot tail gas treatment process and system Download PDFInfo
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- CN107213738A CN107213738A CN201710577153.6A CN201710577153A CN107213738A CN 107213738 A CN107213738 A CN 107213738A CN 201710577153 A CN201710577153 A CN 201710577153A CN 107213738 A CN107213738 A CN 107213738A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D50/00—Combinations of methods or devices for separating particles from gases or vapours
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/002—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by condensation
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/26—Drying gases or vapours
- B01D53/265—Drying gases or vapours by refrigeration (condensation)
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B30/00—Heat pumps
- F25B30/06—Heat pumps characterised by the source of low potential heat
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Abstract
The invention provides a kind of damp and hot tail gas treatment process and system, damp and hot tail gas treatment process of the invention comprises the following steps：（1）Dust removal process is carried out to tail gas by dust arrester；（2）The heat absorbing units that the tail gas that dust arrester is treated introduces heat pump are absorbed heat, cooled, being condensed, dehumidification treatments, make as little as less than 55 °C of temperature drop more than tail gas；（3）Tail gas after absorbing and cooling temperature is subjected to reducing temperature twice dust removal process by wet dedusting.Using the tail gas treatment process of the present invention, tail gas carries out being passed through the heat absorbing units of heat pump after one-time dedusting by dust arrester, heat in the heat absorbing units tail gas of heat pump is largely siphoned away and abrupt temperature drop, exhaust temperature can be reduced to less than 55 °C, avoid wet dedusting stage dedusting water evaporation, be conducive to dust settling in tail gas and by the moisture absorption of wet dedusting, eliminate haze phenomenon.
Description
Technical field
The present invention relates to industrial tail gas processing, more particularly to a kind of damp and hot tail gas treatment process and system.
Background technology
In recent years, haze phenomenon in some areas is serious, and environmental problem rises to new height, and national economy is caused
Significant negative impact, energy-saving and emission-reduction, elimination haze have become the important act that important people's livelihood engineering turns into country, enterprise advocates
Arrange.With industrial development, industrial tail gas discharge is more serious, and most of industrial tail gas is only by simple processing under normal circumstances
Just directly discharge, far from meet the requirement of environmental protection.Common industrial tail gas has the pre- hot exhaust gas of boiler exhaust gas, material, drying tail gas
Deng not only temperature is higher for the tail gas of discharge, can be up to more than 100 degree, and some also contain large quantity of moisture, not only causes heat and water to provide
The waste in source, also there is larger pollution to air.
For it is such the problem of, there is also the various handling process handled tail gas at present.Such as Application No.
201110185264.5th, the applying date discloses a kind of dust-laden, containing damp and hot tail gas collection for 2011.07.04 Chinese invention patent
Into processing unit and handling process.This handling process when handling tail gas first by tail gas by dust arrester dedusting,
Then exchange heat, washed afterwards by washing absorption device and spray equipment by heat transmission equipment.
But when using this processing equipment to carry out vent gas treatment, the heat transfer process of heat-exchanger rig is tail gas by the heat being higher by
Amount is overflowed and realizes heat exchange with the water in heat exchanger tube, and this heat exchange mode is limited due to heat exchange efficiency, and tail gas is by exchanging heat
Remaining temperature is also higher after device heat exchange, and this partial heat that such tail gas is higher by atmospheric temperature is just wasted, heat recovery
Rate is relatively low.And temperature is higher more than tail gas, acutely, flow velocity is larger for molecular motion, when by washing absorption device and spray equipment,
Also it can allow the moisture evaporation of washing absorption device and spray equipment, cause the waste of this part industrial water, not only waste water source,
Also production cost is substantially increased.In addition, when temperature is higher more than tail gas, air molecule motion intense, flow velocity is larger, thin in tail gas
Micro mist dirt, the motion of PM2.5 particles also more acutely, are unfavorable for sedimentation, it is not easy to by spray-absorption, after being diffused into air just
Exacerbate haze phenomenon.Therefore, this tail gas treatment process reclaims extremely limited for hydro-thermal, is also unfavorable for preventing haze.
The content of the invention
It is an object of the invention to provide a kind of moisture, heat recovery rate is high and can effectively prevent at the damp and hot tail gas of haze
Science and engineering skill；Present invention also offers a kind of damp and hot exhaust treatment system.
To achieve the above object, the technical scheme one of damp and hot tail gas treatment process of the invention：A kind of damp and hot vent gas treatment work
Skill, comprises the following steps：（1）Dust removal process is carried out to tail gas by dust arrester；（2）The tail gas that dust arrester is treated draws
The heat absorbing units for entering at least one heat pump are absorbed heat, cooled, being condensed, dehumidification treatments, make as little as 55 °C of temperature drop more than tail gas
Below；（3）Tail gas after absorbing and cooling temperature is subjected to dust removal process by wet dedusting.
Using the present invention tail gas treatment process, tail gas by dust arrester carry out one-time dedusting, can will it is therein greatly
Particle dust is filtered；Tail gas is passed through the heat absorbing units of heat pump afterwards, in the heat absorbing units tail gas of heat pump
Heat is largely siphoned away and abrupt temperature drop, realizes the abundant recovery of tail gas heat quantity, and contain in this process in tail gas
Moisture can also be rapidly condensed into the globule, and the globule condensed into can also absorb dust certain in tail gas, and this process is realized
To the heat absorption of tail gas, cooling, condensation and dehumidification treatments, and by such process, exhaust temperature can be reduced to 55 °C with
Under；Hereafter tail gas, because temperature is relatively low more than tail gas, does not result in wet dedusting when carrying out reducing temperature twice dedusting by wet dedusting
Moisture evaporation, do not result in the moisture loss of wet dedusting substantially, and the relatively low motion for causing air molecule of temperature more than tail gas
Weaken, flow velocity is reduced, reduction in bulk, the sedimentation for the dust being more beneficial in tail gas and the absorption of condensate, can eliminate discharge
Tail gas in PM2.5.
On the basis of above-mentioned technical proposal one,（2）In, it is preferable that the heat pump has two or more, two or more
In heat pump, the heat absorbing units for having at least two heat pumps are set up in parallel along gas flow paths, or have at least two
The heat absorbing units of heat pump are set up in parallel in the circumference on exhaust pipe road, can be so down to the temperature of tail gas lower
Temperature.
On the basis of above-mentioned technical proposal two, further optimization obtains technical scheme three, that is, sets two or more heat pump
System, and the heat absorbing units of each heat pump are set up in parallel along gas flow paths, this arrangement occupies little space.
On the basis of above-mentioned technical proposal one, the heat absorbing units for introducing heat pump in tail gas carry out absorbing and cooling temperature processing
Afterwards, more than tail gas below temperature drop as little as normal temperature.So the moisture in tail gas can be made fully to condense, be easy to reclaim；Simultaneously in temperature
When degree is reduced to below normal temperature, when carrying out reducing temperature twice dust removal process to tail gas, it is to avoid exhaust temperature is too high and makes shower water
Evaporation, and cause exhaust gas volumes contraction, flow velocity reduction during exhaust temperature reduction, the minute dusts being more beneficial in tail gas sink
Drop.
When more than tail gas below temperature drop to normal temperature, the heat absorbing units of heat pump are connected with gives birth to for reclaiming when tail gas passes through
Into condensed water condensate water recovery device.The water condensed that tail gas can be cooled by condensate water recovery device carries out reclaiming profit
With, it is to avoid waste.
Further, condensate water recovery device is sedimentation basin, and the water that condensation is reclaimed can be purified.
In order to reclaim the water used in wet dedusting, the water after wet dedusting can be introduced in sedimentation basin.
Further, the water circulation that the sedimentation basin is communicated with clear water reserviors, clear water reserviors is used for wet dedusting.
On the basis of each above-mentioned technical scheme, it can include by spraying dress in the concrete mode of selection wet dedusting
Put spraying and dedusting.
On the basis of each above-mentioned technical scheme, the dust arrester is sack cleaner or electric dust collector or electric bag
Mixed dust removal device or cyclone dust collector.
The technical scheme one of the damp and hot exhaust treatment system of the present invention：Including carrying out dust removal process for the tail gas to introducing
Dust arrester, at least one be used for the tail gas after dust removal process is absorbed heat, cooled, is condensed, the heat pump system of dehumidification treatments
System and the Wet-way dust-collector for carrying out dirt processing to the treated tail gas of heat pump, the air outlet connection of dust arrester
The heat absorbing units air inlet of heat pump, the heat absorbing units air outlet of heat pump connects the air inlet of Wet-way dust-collector.
When carrying out vent gas treatment using the tail gas treatment device of the present invention, tail gas carries out one-time dedusting by dust arrester,
Bulky grain dust therein can be filtered；Tail gas is passed through the heat absorbing units of heat pump afterwards, in the suction of heat pump
Heat in hot cell tail gas is largely siphoned away and abrupt temperature drop, realizes the abundant recovery of tail gas heat quantity, and in this process
The moisture contained in middle tail gas can also be rapidly condensed into the globule, and the globule condensed into can also absorb powder certain in tail gas
Dirt, this process is realized to the heat absorption of tail gas, cooling, condensation and dehumidification treatments, and by such process, exhaust temperature energy
Enough it is reduced to less than 55 °C；Hereafter tail gas by wet dedusting when carrying out reducing temperature twice dedusting, because temperature is relatively low more than tail gas, no
The moisture evaporation of wet dedusting can be caused, the moisture loss of wet dedusting is not resulted in substantially, and more than tail gas temperature it is relatively low so that
Hypomotility, flow velocity reduction, the reduction in bulk of air molecule, are more beneficial for the sedimentation of dust and the absorption of condensed water in tail gas,
The PM2.5 in the tail gas of discharge can be eliminated.
On the basis of the technical scheme one of above-mentioned damp and hot exhaust treatment system, it can optimize and obtain technical scheme two, institute
Stating dust arrester can be using sack cleaner or electric dust collector or electric bag mixed dust removal device or cyclone dust collector.
On the basis of the technical scheme one of above-mentioned damp and hot exhaust treatment system, it can optimize and obtain technical scheme three, institute
Stating heat pump has in two or more, two or more heat pump, has the heat absorbing units of at least two heat pumps along gas stream
Dynamic path is set up in parallel, or the heat absorbing units for having at least two heat pumps are set side by side in the circumference on exhaust pipe road
Put, so the temperature of tail gas can be down to lower temperature.
On the basis of the technical scheme three of above-mentioned damp and hot exhaust treatment system, it can further optimize and obtain technical scheme
Four, i.e., described heat pump has two or more, and the heat absorbing units of each heat pump are set up in parallel along gas flow paths, this
Arrangement is the simplest, saves space.
On the basis of any one in four technical schemes of above-mentioned damp and hot exhaust treatment system, it can optimize and obtain
Technical scheme five, i.e., be also associated with condensation for reclaiming the condensed water generated when tail gas passes through in the heat absorbing units of heat pump
Apparatus for recovering.The water condensed that tail gas can be cooled by condensate water recovery device is recycled, it is to avoid wasted.
Further, technical scheme six is obtained on the basis of the technical scheme five of damp and hot exhaust treatment system：Condensed water
Retracting device is the sedimentation basin connected with the heat absorbing units of heat pump, can be carried out the condensed water of recovery by sedimentation basin net
Change.
Further, technical scheme seven is obtained on the basis of technical scheme six：The Wet-way dust-collector fills for spray
Put, the recovery tank of the spray equipment connects with sedimentation basin and the water after spray can be made to flow into sedimentation basin.
Further, technical scheme eight is obtained on the basis of technical scheme seven：Damp and hot exhaust treatment system also include with
The clear water reserviors for the upper strata clear water outflow that sedimentation basin is connected and supplied in sedimentation basin, clear water reserviors are connected with spray equipment and to spray equipment
Supply water.
Brief description of the drawings
Fig. 1 is the flow chart of the first use environment of the embodiment one of the damp and hot tail gas treatment process of the present invention；
Fig. 2 is the flow chart of second of use environment of the embodiment one of the damp and hot tail gas treatment process of the present invention；
Fig. 3 is the schematic diagram that tail gas flows along dust arrester, heat pump and Wet-way dust-collector；
Fig. 4 for the present invention damp and hot exhaust treatment system embodiment one in heat pump arrangement schematic diagram；
Fig. 5 for the present invention damp and hot exhaust treatment system embodiment two in heat pump arrangement schematic diagram.
In figure：1st, dryer；10th, damp and hot tail gas；2nd, dust arrester；3rd, dust collecting；4th, heat pump；6th, wet method
Dust arrester；7th, sedimentation basin；8th, clear water reserviors；9th, tail gas is emptied；11st, cold air；12nd, high-temperature gas；13rd, power station；14th, pot
Stove；40th, electric power acting unit；41st, heat absorbing units；42 heat-sink units.
Embodiment
Embodiments of the present invention are described further below in conjunction with the accompanying drawings.
The damp and hot tail gas treatment process of the present invention can be used for the processing for drying tail gas, naturally it is also possible to be set for other
The vent gas treatment of the high-temperature high-humidity of standby discharge.The embodiment one of the damp and hot tail gas treatment process of the present invention is with to semi-coke drying institute
Exemplified by the tail gas of discharge is handled, as shown in figure 1, the damp and hot tail gas 10 that dryer 1 is discharged is carried out by dust arrester 2
Primary dust removing, can filter the big dust particle in tail gas, and have dust collecting 3 to collect；Removed in tail gas by one-level
After dirt, in the heat absorbing units 41 for introducing heat pump 4, heat pump 4 does work the acting of unit 40 by electric power will be single by heat absorption
The damp and hot tail gas heat quantity of member 41 absorbs and makes its abrupt temperature drop and be down to less than 55 °C, now, because exhaust temperature is from several Baidu
Moisture in rapid drawdown, tail gas can be rapidly condensed into the globule, and this process not only realizes the heat absorption to damp and hot tail gas, cooling, and
And also realize the condensation to damp and hot tail gas, dehumidifying；Heat absorbing units 41 are by after heat transmission to heat-sink unit 42, extraneous cold air
11 occur heat exchange with heat-sink unit 42 and propose value heating to form high-temperature gas 12, and high-temperature gas 12 can be with later use, such as
The drying materials of dryer 1 are re-used for, can also be used in boiler 14 and save fuel；Followed by, it is reduced to lower temperature
Tail gas again pass through Wet-way dust-collector 6 carry out reducing temperature twice dust removal process, it becomes possible to realize to the height dedusting of tail gas, heat and
The abundant recovery of moisture.
Being mainly characterized by for the damp and hot tail gas treatment process of the present invention, being capable of maximized absorption tail gas by heat pump
In heat, the temperature of maximized reduction tail gas, heating is carried out by the effect of heat pump and carries after value that heat is subsequently sharp
With being achieved in that the effective recycling of heat.And be follow-up wet dedusting after the maximized reduction of exhaust temperature
Process provides advantage, because the heat carried out when exhaust temperature is higher in wet dedusting processing, tail gas can be in wet method
The moisture evaporation of wet dedusting is caused during dedusting, wet dedusting water consumption is exacerbated, and exhaust temperature it is higher when, air
Molecular motion distance, flow velocity are higher, and the fine particle contained in tail gas, such as PM2.5 particles, activity are violent, not free settling, wet
Also it is not easy to be absorbed in method dust removal process.And after by heat pump, exhaust temperature is reduced, air molecule hypomotility, stream
Prompt drop is low, and the fine particle activity contained in tail gas weakens, and is easy to sedimentation, and also allowed for during wet dedusting by moisture
Absorb, and do not result in moisture evaporation, not only optimize dust removing effects, and save water for dust removal.
By above-mentioned analysis, tail gas temperature when by heat pump drops lower, is more conducive to follow-up
Wet dedusting, accordingly, it is considered to electric energy loss and dust removing effects, preferably drop its temperature after tail gas is by heat pump
Even normal temperature is down to less than 40 DEG C（25℃）Below.
The damp and hot tail gas treatment process of the present invention also includes by condensate water recovery device to passing through heat pump in tail gas
Heat absorbing units when the condensed water that condenses reclaimed, it is to avoid moisture is wasted.In view of the moisture in drying tower tail gas compared with
Many, the water that condensation process is produced is more, and moisture is returned as condensate water recovery device using sedimentation basin 7 in the present embodiment
Receive.And sedimentation basin 7 is additionally operable to reclaim the water in dust removal of wet dedusting process, such water in dust removal and condensed water sink in sedimentation basin 7
Upper strata clear water can be introduced into clear water reserviors 8 behind shallow lake, and is reused during wet dedusting, save water source.
In the embodiment one of the tail gas treatment process of the present invention, one-time dedusting is carried out using sack cleaner, passes through spray
Device spray carries out wet dedusting.In other embodiments, dust arrester can also be electric dust collector or electric bag mixing
Dust arrester is cyclone dust collector, and wet dedusting can use cleaning dust.
The damp and hot tail gas that the tail gas of the tail gas treatment process processing of the present invention can be discharged by non-drying plant, Er Qiejing
Crossing the high-temperature gas 12 of heat pump generation is used for used in the generating in power station 13.
The embodiment one of the damp and hot exhaust treatment system of the present invention, corresponding to the embodiment one of handling process, is specifically included
The dust arrester of dust removal process is carried out for the tail gas to introducing, in addition to the tail gas after dust removal process is absorbed heat, cooled,
Condense, the heat pump of dehumidification treatments and the tail gas for being treated to heat pump carry out the wet of reducing temperature twice dust removal process
Method dust arrester, the air outlet of dust arrester connects the heat absorbing units air inlet of heat pump, and the heat absorbing units of heat pump go out
Air port connects the air inlet of Wet-way dust-collector, and Wet-way dust-collector is communicated with the sedimentation basin for reclaiming water in dust removal, sedimentation basin
Clear water reserviors are communicated with, clear water reserviors are used to flow into for the upper strata clear water in sedimentation basin, and the water in clear water reserviors can be re-used for wet method
Dust removal process.
The power of exhaust emissions amount and existing heat pump in view of dryer, heat pump can set n, its
Middle n >=2, as shown in figure 4, the heat absorbing units 41 of each heat pump are set up in parallel along gas flow paths.
Present invention also offers the embodiment two of damp and hot exhaust treatment system, in embodiment two, as shown in figure 5, heat pump system
System has four, and being arranged circumferentially around exhaust pipe road of heat absorbing units 41 of each heat pump.Certainly, in other realities
Apply in mode, heat pump can have three or five or more than six.Cooling is sufficient in the power of heat pump to require
When, heat pump even can be one.
In the embodiment of above two processing equipment, dust arrester is sack cleaner, and Wet-way dust-collector fills for spray
Put, certainly, in other embodiments, dust arrester can also be cyclone dust collectors or be electric dust collector or be electric bag
Dust arrester, Wet-way dust-collector can be by settling tank filtering or be cleaning dust device.
Using the present invention damp and hot tail gas treatment process by the present invention damp and hot exhaust treatment system can effectively by
Heat recovery in tail gas, at the same before wet dedusting by exhaust temperature be reduced to less than 55 °C it is even lower, so in wet method
Dust removal process is conducive to saving water source, effective dedusting, effectively controls haze.
Claims (10)
1. a kind of damp and hot tail gas treatment process, it is characterised in that：（1）Dust removal process is carried out to tail gas by dust arrester；（2）Will
The heat absorbing units that the treated tail gas of dust arrester introduces at least one heat pump are absorbed heat, cooled, being condensed, at dehumidifying
Reason, makes as little as less than 55 °C of temperature drop more than tail gas；（3）Tail gas after absorbing and cooling temperature is subjected to dust removal process by wet dedusting.
2. damp and hot tail gas treatment process according to claim 1, it is characterised in that：The heat pump has two or more,
In two or more heat pump, the heat absorbing units for having at least two heat pumps are set up in parallel along gas flow paths, Huo Zheyou
The heat absorbing units of at least two heat pumps are set up in parallel in the circumference on exhaust pipe road.
3. damp and hot tail gas treatment process according to claim 2, it is characterised in that：The heat pump has two or more,
And the heat absorbing units of each heat pump are set up in parallel along gas flow paths.
4. damp and hot tail gas treatment process according to claim 1, it is characterised in that：The heat absorption of heat pump is introduced in tail gas
Unit is carried out after absorbing and cooling temperature processing, more than tail gas below temperature drop as little as normal temperature.
5. damp and hot tail gas treatment process according to claim 4, it is characterised in that：The heat absorbing units of heat pump are connected with
Condensate water recovery device for reclaiming the condensed water generated when tail gas passes through.
6. a kind of damp and hot exhaust treatment system, it is characterised in that the dedusting including carrying out dust removal process for the tail gas to introducing
Device, at least one be used for the tail gas after dust removal process is absorbed heat, cooled, is condensed, the heat pump of dehumidification treatments and
Tail gas for being treated to heat pump carries out the Wet-way dust-collector of dirt processing, the air outlet connection heat pump system of dust arrester
The heat absorbing units air inlet of system, the heat absorbing units air outlet of heat pump connects the air inlet of Wet-way dust-collector.
7. damp and hot exhaust treatment system according to claim 6, it is characterised in that the dust arrester is sack cleaner
Or electric dust collector or electric bag mixed dust removal device or cyclone dust collector.
8. damp and hot exhaust treatment system according to claim 6, it is characterised in that the heat pump has two or more,
In two or more heat pump, the heat absorbing units for having at least two heat pumps are set up in parallel along gas flow paths, Huo Zheyou
The heat absorbing units of at least two heat pumps are set up in parallel in the circumference on exhaust pipe road.
9. damp and hot exhaust treatment system according to claim 8, it is characterised in that the heat pump has two or more,
The heat absorbing units of each heat pump are set up in parallel along gas flow paths.
10. the damp and hot exhaust treatment system according to claim 6-9 any one, it is characterised in that the suction of heat pump
Hot cell is also associated with the condensate water recovery device for reclaiming the condensed water generated when tail gas passes through.
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Cited By (1)
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113330196A (en) * | 2018-10-22 | 2021-08-31 | 上海必修福企业管理有限公司 | Engine tail gas dedusting system and method |
| CN113330196B (en) * | 2018-10-22 | 2023-08-15 | 上海必修福企业管理有限公司 | Engine tail gas dust removal system and method |
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