CN109692537A - A kind of method and apparatus of cooling coalescence water gas recovery purification - Google Patents
A kind of method and apparatus of cooling coalescence water gas recovery purification Download PDFInfo
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- CN109692537A CN109692537A CN201910031388.4A CN201910031388A CN109692537A CN 109692537 A CN109692537 A CN 109692537A CN 201910031388 A CN201910031388 A CN 201910031388A CN 109692537 A CN109692537 A CN 109692537A
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 133
- 238000004581 coalescence Methods 0.000 title claims abstract description 70
- 238000011084 recovery Methods 0.000 title claims abstract description 63
- 238000000034 method Methods 0.000 title claims abstract description 53
- 238000001816 cooling Methods 0.000 title claims abstract description 49
- 238000000746 purification Methods 0.000 title claims abstract description 44
- 239000007789 gas Substances 0.000 claims abstract description 206
- 238000004140 cleaning Methods 0.000 claims abstract description 102
- 239000007788 liquid Substances 0.000 claims abstract description 61
- 239000007921 spray Substances 0.000 claims abstract description 36
- 238000005406 washing Methods 0.000 claims abstract description 36
- 230000008569 process Effects 0.000 claims abstract description 22
- 238000006477 desulfuration reaction Methods 0.000 claims abstract description 19
- 230000023556 desulfurization Effects 0.000 claims abstract description 17
- 238000009833 condensation Methods 0.000 claims abstract description 15
- 230000005494 condensation Effects 0.000 claims abstract description 15
- 239000003546 flue gas Substances 0.000 claims abstract description 12
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims abstract description 10
- 238000010521 absorption reaction Methods 0.000 claims abstract description 8
- 239000004615 ingredient Substances 0.000 claims abstract description 3
- 239000003599 detergent Substances 0.000 claims description 14
- 238000005507 spraying Methods 0.000 claims description 12
- 238000004064 recycling Methods 0.000 claims description 8
- 230000007423 decrease Effects 0.000 claims description 6
- 230000007812 deficiency Effects 0.000 claims description 5
- 238000007747 plating Methods 0.000 claims description 5
- 238000001704 evaporation Methods 0.000 claims description 4
- 230000008020 evaporation Effects 0.000 claims description 4
- 238000012856 packing Methods 0.000 claims description 3
- 230000008859 change Effects 0.000 claims description 2
- 230000003009 desulfurizing effect Effects 0.000 claims 1
- 238000010828 elution Methods 0.000 claims 1
- 239000000779 smoke Substances 0.000 abstract description 8
- 230000000007 visual effect Effects 0.000 abstract description 5
- 238000003912 environmental pollution Methods 0.000 abstract description 3
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 12
- 101100204059 Caenorhabditis elegans trap-2 gene Proteins 0.000 description 10
- RAHZWNYVWXNFOC-UHFFFAOYSA-N Sulphur dioxide Chemical compound O=S=O RAHZWNYVWXNFOC-UHFFFAOYSA-N 0.000 description 8
- 239000000428 dust Substances 0.000 description 7
- 229910021529 ammonia Inorganic materials 0.000 description 6
- 230000000694 effects Effects 0.000 description 5
- 239000003500 flue dust Substances 0.000 description 5
- 230000005532 trapping Effects 0.000 description 5
- 239000002956 ash Substances 0.000 description 4
- 235000002918 Fraxinus excelsior Nutrition 0.000 description 3
- 235000019504 cigarettes Nutrition 0.000 description 3
- 230000008676 import Effects 0.000 description 3
- 230000002745 absorbent Effects 0.000 description 2
- 239000002250 absorbent Substances 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000007246 mechanism Effects 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 239000002253 acid Substances 0.000 description 1
- 230000002378 acidificating effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000012459 cleaning agent Substances 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 239000006196 drop Substances 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 239000003517 fume Substances 0.000 description 1
- 239000008187 granular material Substances 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000005272 metallurgy Methods 0.000 description 1
- 239000011859 microparticle Substances 0.000 description 1
- 239000003595 mist Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000003020 moisturizing effect Effects 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 239000012716 precipitator Substances 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D47/00—Separating dispersed particles from gases, air or vapours by liquid as separating agent
- B01D47/06—Spray cleaning
-
- 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
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/46—Removing components of defined structure
- B01D53/48—Sulfur compounds
- B01D53/50—Sulfur oxides
- B01D53/507—Sulfur oxides by treating the gases with other liquids
-
- 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
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/96—Regeneration, reactivation or recycling of reactants
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Health & Medical Sciences (AREA)
- Biomedical Technology (AREA)
- Environmental & Geological Engineering (AREA)
- Analytical Chemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Life Sciences & Earth Sciences (AREA)
- Sustainable Development (AREA)
- Treating Waste Gases (AREA)
Abstract
A kind of method of cooling coalescence water gas recovery purification carries out cooling processing with cleaning solution in the later process of wet type gas purification process, cools down 1 DEG C or more to gas, even up to cools down 40 DEG C, recycles in gas temperature-fall period to the condensation of moisture content in gas；The major cycle progress spray washing for spray washing liquid or the preceding working procedure purified together with condensation recycle-water for wet type gas again of cooling down.The later process of the wet type gas purification refers to when wet type gas purification utilization circulated sprinkling absorbing liquid carries out the process, especially flue gas desulfurization of washing absorption to gas harmful ingredient at the middle and upper levels to the processing section of flue gas.It solves the problems, such as that the smoke evacuation visual effect of gas cleaning plant is bad to reduce environmental pollution, also it can further improve cleanser recovery utilization rate, moisture in gas recovery, reduce the water consumption of Wet purifier, the Technical Economy and environment protecting for improving device, are particularly suitable for the deep treatment of flue gas desulfurization neat stress.
Description
Technical field
The invention belongs to field of environment protection, are related to the method and apparatus of wet type gas purification, especially suitable for flue gas wet process
The deep treatment of the flue gas of desulfurization etc..
Background technique
Wet type gas purifies high-efficient, reliable for operation.However, absorbing liquid is all entrained with after wet processed in neat stress
The polluters such as drop, flue dust, absorbent.In order to reduce the discharge of these polluters, present technique generally uses layer 2-3
Demister handles neat stress, and this scheme is only capable of the drop of 20 μm of removal or more the absorbing liquid of partial size, to granule
The fine particulates of diameter have little effect.The gas of discharge is difficult to spread in smoke, mists and clouds such as dignified white, blues, forms longer cigarette
Plumage causes serious visual pollution, directly constitutes pollution to surrounding enviroment, equipment, the pollutant of the discharge after these desulfurization
It is one of the origin cause of formation of haze weather being concerned.This problem is increasingly subject to the attention of desulfurization environmental protection sector.
Wet type gas purifies the desulfurization for being mainly used for thermal power plant, is also used for the desulfurization dedirt of the enterprises such as metallurgy, chemical industry.
Have in recent years and the research and application that gas purifies again are carried out using wet dust removal technology, but wet-esp is to thin
The removal effect of microparticle object does not gain public acceptance also, and wet electrical dust precipitator greatly improves investment, increases plant energy consumption, thus greatly
Operating cost is increased greatly, many enterprises are difficult to bear.
Summary of the invention
It is an object of the present invention to provide a kind of methods that wet type gas purifies cooling coalescence water and gas recovery purification
With, this method using mainly by this technique condensation recycle-water as spray washing water, cooling spray washing water after cooling makes
Gas temperature decline, make water recovery water in gas and the water in gas recovery；Reach fine particulates removing and returns
The purpose of moisture in getter body；Cool down furthermore with the indirect cooler of the modes such as air to cleaning solution, compared to cooling tower etc.
The pollution that directly cooling equipment can reduce the loss of water, avoid air to cleaning solution；Pass through the cigarette in the device purification gas
Dirt, absorption drop, absorbing liquid drop etc., to solve the problems, such as the bad reduction environment of the smoke evacuation visual effect of gas cleaning plant
Pollution, also can further improve cleanser recovery utilization rate, the moisture in gas recovery, the water for reducing Wet purifier disappears
Consumption, improves the Technical Economy and environment protecting of device, while also recycling low-quality heat source and energy-efficient effect.
The technical scheme is that a kind of method of cooling coalescence water gas recovery purification, purifies work in wet type gas
In the later process of skill, cooling processing is carried out with cleaning solution, is cooled down 1 DEG C or more to gas, even up to cools down 40 DEG C (as used
Liquid heat-exchanger, or be in contact with the heat exchanger of heat pump, for recycling low-quality heat source), to gas in gas temperature-fall period
The condensation of middle moisture content is recycled；Cool down spray washing liquid or again together with condensation recycle-water for the preceding working procedure of wet type gas purification
Major cycle carries out spray washing.
The later process of the wet type gas purification refers to wet type gas purification utilization circulated sprinkling absorbing liquid to gas harmful
At the middle and upper levels to the processing section of flue gas when the process, especially flue gas desulfurization of ingredient progress washing absorption.
Water vapour is condensed into water droplet, and coalescence as the nuclei of condensation using fine particulates such as dirt in gas in gas temperature-fall period
For big droplet, the droplet for condensing coalescence is easier to be trapped by the cleaning solution of spraying cooling, realizes the depth to fine particulates
Purification and the recycling to moisture content in gas, before condensation recycle-water can be purified with cooling spray washing liquid for wet type gas
The major cycle of procedure carries out spray washing, and (coalescence water refers to the washing that condensation recycle-water merges with cooling spray washing liquid together
Liquid can also condense recycle-water and individually recycle).
The gas outlet of the postchannel process of gas purification uses following demisters, the demister to 5 μm of partial size with
On liquid droplet capture efficiency be greater than 85%, to 20 μm of partial size or more of liquid droplet capture efficiency be greater than 95%, be 1-3 layer tubular type, roll over
The demisters such as flowing plate formula, bundled tube, screen mesh type, structured packing type are composed of all kinds of demisters.
The empty tower gas velocity 0.6m/s-4m/s of the coalescence water gas recovery clean-up stage of gas purifying equipment, cooling coalescence washing
The liquid-gas ratio of spray is 0.5L/m3-15L/m3。
After the washing of coalescence water of the gas through cooling down, gas temperature declines 1 DEG C -30 DEG C, vapour content decline in gas
2% or more.
The temperature of the gas feed of the coalescence water gas recovery clean-up stage of gas purifying equipment is 30 DEG C -75 DEG C, and gas goes out
Mouth temperature is 28 DEG C -70 DEG C, and the spray washing water inlet temperature of coalescence water gas recovery clean-up stage is 28 DEG C -60 DEG C, and spray is washed
Washing water outlet temperature is 30 DEG C -65 DEG C.
30 DEG C -65 DEG C of the washing water inlet of aerial cooler, 28 DEG C -60 DEG C of outlet temperature.
Cooling coalescence water uses coalescence water (cleaning solution) aerial cooler or liquid heat-exchanger, and cooler or heat exchanger can be with
It is arranged on the return line of liquid trap, also can be set on the export pipeline of circulating pump 9.
The device that the present invention uses: coalescence water gas recovery clean-up stage is located at the postorder section of gas purifying equipment, gas warp
Enter coalescence water gas recovery clean-up stage, the gas of coalescence water gas recovery clean-up stage after the preliminary wet purification of gas purifying equipment
Cleaning solution liquid trap, wash spray layer, demister are respectively equipped between import and gas vent；Outside gas purifying equipment, setting
There are cleaning solution cooler, cleaning solution circulating slot, net detergent circulator and corresponding pipeline；Coalescence water (cleaning solution) is in cleaning solution
Spraying layer 4, cleaning solution cooler, cleaning solution circulating slot 8, forms circulation between net detergent circulator 9 at cleaning solution liquid trap 2,
Extra cleaning solution passes through the draining 11 that is arranged on cycle cooling plating drum and send outside equipment, by water outside secondary water when cleaning solution deficiency
10 are supplemented into the circulatory system.It is the application for the method that wet type gas purifies cooling coalescence water and gas recovery purification.
On the settable liquid trap outlet return pipe of cleaning solution aerial cooler, it may also be arranged on circulating-pump outlet pipeline.
Gas is washed through the cleaning solution spraying layer of cold washing liquid, and gas is cooled down, and a part of water vapour is in gas with ash
Equal fine particulates are that the nuclei of condensation condense into water, and the washed liquid spray trapping of the condensed water that fine particulates are mixed with water, which enters, washes
Wash liquid.
Coalescence water gas recovery clean-up stage of the invention can be placed in main purification device, can also be suitable by the process of this device
Sequence is placed in each section outside main purification device.
This method declines the principle of then water vapor pressure decline using gas temperature, makes water recovery water in gas and returns
Water in getter body；It is solidifying in water vapour and using the process of water recovery using fine particulates such as dirt as the mechanism of the nuclei of condensation
Simultaneously increase fine particulates partial size coalescence in knot recycling, is easy to the trappings such as washed liquid, demister, reaches fine particulates
The purpose of removing；Cool down furthermore with air indirect cooler to cleaning solution, directly cooling down equipment compared to cooling tower etc. can be with
It reduces the loss of water, avoid pollution of the air to cleaning solution；Pass through flue dust, the absorption drop, absorption in the device purification gas
Liquid drop etc. reduces environmental pollution to solve the problems, such as that the smoke evacuation visual effect of gas cleaning plant is bad, can also be further
Cleanser recovery utilization rate is improved, the moisture in gas recovery reduces the water consumption of Wet purifier, improves the technology of device
Economy and environment protecting.
Beneficial effects of the present invention: the present invention reaches the mesh that gas (Wet smoke purification) purifies again in simpler and more direct mode
, to effectively reduce neat stress middle acid substance, flue dust, droplet equal size；Gas cleaning plant is set to meet more maximum discharge
It is required that.By acidic materials, flue dust, absorption drop, the absorbing liquid drop etc. in purification gas, to solve gas cleaning plant
The bad problem of smoke evacuation visual effect reduce environmental pollution, also can further improve cleanser recovery utilization rate, gas recovery
In moisture, reduce the water consumption of Wet purifier, improve the Technical Economy and environment protecting of device, be particularly suitable for cigarette
The deep treatment of desulfurization neat stress.It is cooling solidifying suitable for various wet type gas (the especially purified treatment of high-temperature flue gas) purification
And water gas recovery purifies, and present invention reduces the entrainments in desulfurization fume, the content of absorbing liquid and absorbent is reduced,
The content for further decreasing flue dust effectively improves the influence produced to surrounding enviroment, improves absorption cleaning agent, the recycling of water
Utilization rate, the recycling etc. of low-quality heat, to improve the economy of operation.
Detailed description of the invention
Fig. 1 is schematic structural view of the invention.
Specific embodiment
A kind of method of cooling coalescence water gas recovery purification of the present invention is returned by the coalescence water in gas cleaning plant
Receive clean-up stage and cleaning solution aerial cooler outside gas cleaning plant, cleaning solution circulating slot, net detergent circulator and
Corresponding pipeline etc. is constituted.
Mechanism of the present invention is shown in attached drawing 1；Apparatus of the present invention are with reference to following: gas purifying equipment 1, washing liquid trap 2, demister
3, the gas feed of wash spray layer 4, the gas vent 5 of coalescence water gas recovery clean-up stage, coalescence water gas recovery clean-up stage
6, cleaning solution aerial cooler 7, cleaning solution circulating slot 8, net detergent circulator 9, moisturizing 10, draining 11, coalescence water recycle gas
Body clean-up stage 12.
Coalescence water gas recovery clean-up stage 12 is located at the postorder section of gas purifying equipment 1, and gas is through at the beginning of gas purifying equipment 1
Enter coalescence water gas recovery clean-up stage 12, the gas feed 6 of coalescence water gas recovery clean-up stage 12 and gas after walking wet purification
It is from bottom to up demister 3, wash spray layer 4, cleaning solution liquid trap 2 between body outlet 5.Outside gas purifying equipment 1, it is provided with
Cleaning solution aerial cooler 7 (liquid-liquid heat exchanger can also be used), cleaning solution circulating slot 8, net detergent circulator 9 and corresponding pipe
Road.
The gas outlet of the postchannel process of gas purification uses demister 3, to 5 μm of partial size or more of liquid droplet capture efficiency
Greater than 85%, 95% is greater than to 20 μm of partial size or more of liquid droplet capture efficiency, is layer 2-3 baffle plate type, screen mesh type demister group
It closes.
The cleaning solution is followed in cleaning solution spraying layer 4, cleaning solution liquid trap 2, cleaning solution aerial cooler 7, cleaning solution
Circulation is formed between annular groove 8, net detergent circulator 9；The empty tower gas velocity 0.6m/s-4m/ of coalescence water gas recovery clean-up stage 12
S, the liquid-gas ratio of cooling coalescence wash spray are 0.5L/m3-15L/m3。
Specific composition are as follows: the coalescence water gas recovery clean-up stage 12 is located at the postorder section of gas purifying equipment 1, gas
Enter coalescence water gas recovery clean-up stage 12, coalescence water gas recovery clean-up stage after the preliminary wet purification of gas purifying equipment 1
Cleaning solution liquid trap 2, wash spray layer 4, demister 3 are respectively equipped between 12 gas feed 6 and gas vent 5.Gas is net
Change outside equipment, is provided with cleaning solution aerial cooler 7, cleaning solution circulating slot 8, net detergent circulator 9 and corresponding pipeline.
On the settable 2 outlet return pipe of liquid trap of cleaning solution aerial cooler 7, it may also be arranged on circulating pump 9 and go out
On mouth pipeline.
The cleaning solution is followed in cleaning solution spraying layer 4, cleaning solution liquid trap 2, cleaning solution aerial cooler 7, cleaning solution
Circulation is formed between annular groove 8, net detergent circulator 9, extra cleaning solution passes through the draining being arranged on cycle cooling plating drum
11 send outside equipment, are supplemented into the circulatory system by water 10 outside secondary water when cleaning solution deficiency.
The gas is washed through the cleaning solution spraying layer 4 of cold washing liquid, and gas is cooled down, and a part of water steams in gas
Vapour condenses into water by the nuclei of condensation of fine particulates such as ashes, and the condensed water that fine particulates are mixed with water is washed liquid spray trapping
Into cleaning solution.
The aerial cooler 7 is the equipment to be cooled down using normal temperature air to circulating cleaning solution, preferably air with
The cooler (such as tubular heat exchanger) of cleaning solution mediate contact reduces the pollution of water evaporation and air to cleaning solution.
The demister 3 is greater than 85% to 5 μm of partial size or more of liquid droplet capture efficiency, to 20 μm of partial size or more of drop
Arresting efficiency is greater than 95%, for demisters such as 1-3 layers of tubular type, baffle plate type, bundled tube, screen mesh type, structured packing types or by each
Class demister is composed.
The 12 empty tower gas velocity 0.6m/s-4m/s of coalescence water gas recovery clean-up stage of the gas purifying equipment, cooling are solidifying
And the liquid-gas ratio of wash spray is 0.5L/m3-15L/m3。
Embodiment one:
Wet desulphurization tail gas for 400t/h boiler smoke purifies again, and processing exhaust gas volumn is 400000m3/ h, desulfurization
SO in import flue gas2Content is 2000mg/Nm3, dust content 20mg/Nm3.Neat stress amount is 410000m after wet desulphurization3/ h, temperature
Degree is 51 DEG C, relative humidity 95%, absolute humidity, that is, vapour content 12.8%, content of sulfur dioxide 35mg/Nm3, dust content
12mg/Nm3, droplet content 70mg/Nm3.Neat stress is purified again using present invention progress depth after wet desulphurization.
Method and structure:
The method for the cooling coalescence water gas recovery purification that desulfidation tail gas purifies again is shown in attached drawing 1.
Main feature:
The coalescence water gas recovery clean-up stage 12 that neat stress purifies again after the wet desulphurization is located at gas purifying equipment 1
Postorder section, i.e. the top of wet desulfuration tower, gas enters after the purification of 1 preliminary wet type (i.e. wet desulphurization) of gas purifying equipment
Coalescence water gas recovery clean-up stage 12 is set respectively between the gas feed 6 and gas vent 5 of coalescence water gas recovery clean-up stage 12
There are cleaning solution liquid trap 2, wash spray layer 4, demister 3.Outside gas purifying equipment, it is provided with cleaning solution aerial cooler 7, washes
Wash liquid circulating slot 8, net detergent circulator 9 and corresponding pipeline.
The cleaning solution aerial cooler 7 is arranged on 9 export pipeline of circulating pump.
The cleaning solution is followed in cleaning solution spraying layer 4, cleaning solution liquid trap 2, cleaning solution aerial cooler 7, cleaning solution
Circulation is formed between annular groove 8, net detergent circulator 9, extra cleaning solution passes through the draining being arranged on cycle cooling plating drum
11 send outside equipment, are supplemented into the circulatory system by water 10 outside secondary water when cleaning solution deficiency.
The gas is washed through the cleaning solution spraying layer 4 of cold washing liquid, and gas is cooled down, and a part of water steams in gas
Vapour condenses into water by the nuclei of condensation of fine particulates such as ashes, and the condensed water that fine particulates are mixed with water is washed liquid spray trapping
Into cleaning solution.
The aerial cooler 7 is the equipment to be cooled down using normal temperature air to circulating cleaning solution, using air with
The cooler of cleaning solution mediate contact reduces the pollution of water evaporation and air to cleaning solution.
The demister 3 is to 5 μm of partial size or more of liquid droplet capture efficiency 90%, to 20 μm of partial size or more of liquid droplet capture
Efficiency is greater than 96%, is composed for 1 layer of tubular type, 1 layer of baffle plate type, 1 layer of screen mesh type demister.
The 12 empty tower gas velocity 1.8m/s of coalescence water gas recovery clean-up stage of the gas purifying equipment, i.e. diameter are 9m,
The liquid-gas ratio for the coalescence wash spray that cools down is 3L/m3, i.e. spray flow is 1230m3/h。
Gas gas temperature after cooling coalescence washing declines 3 DEG C, then purified gas temperature is reduced to 48 DEG C,
Absolute humidity is reduced to 11.1%, vapour content decline 13.3%.
The temperature of the gas feed 6 of the coalescence water gas recovery clean-up stage 12 of the gas purifying equipment is 51 DEG C, gas
It is 48 DEG C that body, which exports 5 temperature, and spray washing water inlet temperature is 40 DEG C, and spray washing water outlet temperature is 41 DEG C.
41 DEG C of the washing water inlet of the aerial cooler, 40 DEG C of outlet temperature.
As a result:
Effect: it is vented droplet content 19mg/m in 5 neat stress3, dust content 4mg/Nm3, sulfur dioxide 25mg/Nm3, return
Receive water 5.8m3/h。
Embodiment two:
Wet process ammonia process of desulfurization tail gas for 480t/h boiler smoke purifies again, and processing exhaust gas volumn is 600000m3/ h,
SO in desulfurization import flue gas2Content is 3000mg/Nm3, dust content 15mg/Nm3.Neat stress amount is 610000m after wet desulphurization3/
H, temperature are 49 DEG C, relative humidity 95%, absolute humidity, that is, vapour content 11.8%, content of sulfur dioxide 33mg/Nm3, dirt
Content 8mg/Nm3, the escaping of ammonia 2mg/Nm3, droplet content 50mg/Nm3.Neat stress is carried out using the present invention after the wet process ammonia process of desulfurization
Depth purifies again.
Method and structure:
The method for the cooling coalescence water gas recovery purification that desulfidation tail gas purifies again is shown in attached drawing 1.
Main feature:
The coalescence water gas recovery clean-up stage 12 that neat stress purifies again after the wet process ammonia process of desulfurization is located at gas purification
The postorder section of equipment 1, the i.e. top of wet desulfuration tower, gas is through the preliminary wet type of gas purifying equipment 1 (i.e. the wet process ammonia process of desulfurization)
Enter coalescence water gas recovery clean-up stage 12, the gas feed 6 of coalescence water gas recovery clean-up stage 12 and gas vent 5 after purification
Between be respectively equipped with cleaning solution liquid trap 2, wash spray layer 4, demister 3.Outside gas purifying equipment, it is provided with cleaning solution air
Cooler 7, cleaning solution circulating slot 8, net detergent circulator 9 and corresponding pipeline.
The cleaning solution aerial cooler 7 is arranged on 9 export pipeline of circulating pump.
The cleaning solution is followed in cleaning solution spraying layer 4, cleaning solution liquid trap 2, cleaning solution aerial cooler 7, cleaning solution
Circulation is formed between annular groove 8, net detergent circulator 9, extra cleaning solution passes through the draining being arranged on cycle cooling plating drum
11 send outside equipment, are supplemented into the circulatory system by water 10 outside secondary water when cleaning solution deficiency.
The gas is washed through the cleaning solution spraying layer 4 of cold washing liquid, and gas is cooled down, and a part of water steams in gas
Vapour condenses into water by the nuclei of condensation of fine particulates such as ashes, and the condensed water that fine particulates are mixed with water is washed liquid spray trapping
Into cleaning solution.
The aerial cooler 7 is the equipment to be cooled down using normal temperature air to circulating cleaning solution, using air with
The cooler of cleaning solution mediate contact reduces the pollution of water evaporation and air to cleaning solution.
The demister 3 is to 5 μm of partial size or more of liquid droplet capture efficiency 90%, to 20 μm of partial size or more of liquid droplet capture
Efficiency is greater than 96%, is composed for 1 layer of tubular type, 2 layers of baffle type mist eliminator.
The 12 empty tower gas velocity 2.15m/s of coalescence water gas recovery clean-up stage of the gas purifying equipment, i.e. diameter are
10m, the liquid-gas ratio of cooling coalescence wash spray are 2.5L/m3, i.e. spray flow is 1525m3/h。
Gas gas temperature after cooling coalescence washing declines 3 DEG C, then purified gas temperature is reduced to 46 DEG C,
Absolute humidity is reduced to 10.1%, vapour content decline 14.4%.
The temperature of the gas feed 6 of the coalescence water gas recovery clean-up stage 12 of the gas purifying equipment is 49 DEG C, gas
It is 46 DEG C that body, which exports 5 temperature, and spray washing water inlet temperature is 40 DEG C, and spray washing water outlet temperature is 41 DEG C.
41 DEG C of the washing water inlet of the aerial cooler, 40 DEG C of outlet temperature.
As a result:
Effect: it is vented droplet content 16mg/m in 5 neat stress3, dust content 3mg/Nm3, sulfur dioxide 26mg/Nm3, ammonia
Escape 0.2mg/Nm3, recycle-water 7.8m3/h。
Above embodiments do not limit the present invention in any way, all to be made in a manner of equivalent transformation to above embodiments
Other improvement and application, belong to protection scope of the present invention.
Claims (10)
1. a kind of method of cooling coalescence water gas recovery purification, it is characterised in that: in the rear road work of wet type gas purification process
In sequence, cooling processing is carried out with cleaning solution, is cooled down 1 DEG C -40 DEG C to gas, the condensation in gas temperature-fall period to moisture content in gas
Recycling；Cooling spray washing liquid or the again major cycle together with condensation recycle-water for the preceding working procedure of wet type gas purification are sprayed
Elution is washed.
2. the method for cooling coalescence water gas recovery purification as described in claim 1, which is characterized in that the wet type gas is net
The later process of change refers to that wet type gas purification utilization circulated sprinkling absorbing liquid carries out the process of washing absorption to gas harmful ingredient,
Especially flue gas desulfurization when at the middle and upper levels to the processing section of flue gas.
3. the method that the cooling coalescence water gas recovery as described in one of claim 1-2 purifies, which is characterized in that the gas
The gas outlet of the postchannel process of purification uses following demisters, and the demister is to 5 μm of partial size or more of liquid droplet capture
Efficiency is greater than 85%, is greater than 95% to 20 μm of partial size or more of liquid droplet capture efficiency, is 1-3 layers of tubular type, baffle plate type, tube bank
The demisters such as formula, screen mesh type, structured packing type are composed of all kinds of demisters.
4. the method that the cooling coalescence water gas recovery as described in one of claim 1-2 purifies, which is characterized in that gas purification
The desulfurizing tower empty tower gas velocity 0.6m/s-4m/s of the coalescence water gas recovery clean-up stage of equipment, the liquid gas for the coalescence wash spray that cools down
Than for 0.5L/m3-15L/m3。
5. the method that the cooling coalescence water gas recovery as described in one of claim 1-2 purifies, which is characterized in that gas is through dropping
After the washing of the coalescence water of temperature, gas temperature declines 1 DEG C -30 DEG C, 2% or more vapour content decline in gas.
6. the method that the cooling coalescence water gas recovery as described in one of claim 1-2 purifies, which is characterized in that gas purification
The temperature of the gas feed of the coalescence water gas recovery clean-up stage of equipment is 30 DEG C -75 DEG C, and gas outlet temperature is 28 DEG C -70
DEG C, the spray washing water inlet temperature of coalescence water gas recovery clean-up stage is 28 DEG C -60 DEG C, and spray washing water outlet temperature is 30
℃-65℃。
7. the method for cooling coalescence water gas recovery purification as described in claim 1, which is characterized in that aerial cooler is washed
Wash 30 DEG C -65 DEG C of water inlet, 28 DEG C -60 DEG C of outlet temperature.
8. the method for cooling coalescence water gas recovery purification as described in claim 1, which is characterized in that cooling coalescence water uses
On the return line of coalescence water (cleaning solution) aerial cooler or liquid heat-exchanger, cooler or heat exchanger setting liquid trap, or
It is arranged on the export pipeline of circulating pump.
9. the method for cooling coalescence water gas recovery purification as described in claim 1, it is characterised in that the air is cooling
Device is the equipment to be cooled down using normal temperature air to circulating cleaning solution, the preferably cooler of air and cleaning solution mediate contact,
Reduce the pollution of water evaporation and air to cleaning solution；It, can also on the settable liquid trap outlet return pipe of cleaning solution aerial cooler
It is arranged on circulating-pump outlet pipeline.
10. a kind of device of the method using the purification of cooling coalescence water gas recovery described in one of claim 1-9, feature
It is: is respectively equipped with cleaning solution liquid trap, washing between the gas feed and gas vent of coalescence water gas recovery clean-up stage
Spraying layer, demister；Separately it is provided with cleaning solution cooler, cleaning solution circulating slot, net detergent circulator and corresponding pipeline；It is solidifying
And water is between cleaning solution spraying layer, cleaning solution liquid trap, cleaning solution cooler, cleaning solution circulating slot, net detergent circulator
Circulation is formed, extra cleaning solution passes through the draining that is arranged on cycle cooling plating drum and send outside equipment, by outer when cleaning solution deficiency
The outer water of water is supplemented into the circulatory system；Cleaning solution aerial cooler is arranged on liquid trap outlet return pipe, or setting is recycling
Pump discharge pipe road.
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