CN107233791A - One kind eliminates catalytic unit desulphurization denitration tower plume method - Google Patents

One kind eliminates catalytic unit desulphurization denitration tower plume method Download PDF

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Publication number
CN107233791A
CN107233791A CN201710625370.8A CN201710625370A CN107233791A CN 107233791 A CN107233791 A CN 107233791A CN 201710625370 A CN201710625370 A CN 201710625370A CN 107233791 A CN107233791 A CN 107233791A
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China
Prior art keywords
desulphurization denitration
tower
denitration tower
flue gas
plume
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CN201710625370.8A
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Chinese (zh)
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CN107233791B (en
Inventor
张春生
周建文
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中国石油化工股份有限公司
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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D53/00Separation 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
    • B01D53/34Chemical or biological purification of waste gases
    • B01D53/74General processes for purification of waste gases; Apparatus or devices specially adapted therefor
    • B01D53/80Semi-solid phase processes, i.e. by using slurries
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D47/00Separating dispersed particles from gases, air or vapours by liquid as separating agent
    • B01D47/02Separating dispersed particles from gases, air or vapours by liquid as separating agent by passing the gas or air or vapour over or through a liquid bath
    • B01D47/022Separating dispersed particles from gases, air or vapours by liquid as separating agent by passing the gas or air or vapour over or through a liquid bath by using a liquid curtain
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D53/00Separation 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
    • B01D53/34Chemical or biological purification of waste gases
    • B01D53/46Removing components of defined structure
    • B01D53/48Sulfur compounds
    • B01D53/50Sulfur oxides
    • B01D53/501Sulfur oxides by treating the gases with a solution or a suspension of an alkali or earth-alkali or ammonium compound
    • B01D53/504Sulfur oxides by treating the gases with a solution or a suspension of an alkali or earth-alkali or ammonium compound characterised by a specific device
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D53/00Separation 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
    • B01D53/34Chemical or biological purification of waste gases
    • B01D53/46Removing components of defined structure
    • B01D53/54Nitrogen compounds
    • B01D53/56Nitrogen oxides
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D2247/00Details relating to the separation of dispersed particles from gases, air or vapours by liquid as separating agent
    • B01D2247/10Means for removing the washing fluid dispersed in the gas or vapours
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D2251/00Reactants
    • B01D2251/10Oxidants
    • B01D2251/104Ozone
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D2251/00Reactants
    • B01D2251/30Alkali metal compounds
    • B01D2251/304Alkali metal compounds of sodium
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D2251/00Reactants
    • B01D2251/60Inorganic bases or salts
    • B01D2251/604Hydroxides
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D2258/00Sources of waste gases
    • B01D2258/02Other waste gases
    • B01D2258/0283Flue gases

Abstract

Catalytic unit desulphurization denitration tower plume method is eliminated the invention discloses one kind, less than the 40 DEG C eliminations to realize plume are dropped to by the flue-gas temperature for exporting desulphurization denitration tower flue gas.The present invention eliminates catalytic unit desulphurization denitration tower plume method, water loss is effectively reduced, while eliminating plume.

Description

One kind eliminates catalytic unit desulphurization denitration tower plume method
Technical field
Catalytic unit desulphurization denitration tower plume method is eliminated the present invention relates to one kind, belongs to plume and eliminates field.
Background technology
From 1 day July in 2017, domestic oil refining industry catalytic unit fume emission performed GB 31570-2015《Oil Refine emission of industrial pollutants standard》, special to atmosphere pollution emission limit requires as follows:Particulate matter ≯ 30mg/m3, dioxy Change sulphur ≯ 50mg/m3, nitrogen oxides ≯ 100mg/m3.To adapt to this standard, country's catalytic unit both increases flue gas desulfurization at present Denitration facility, the technology used is all for Wet Flue Gas Desulfurization Technique, and Technology origin has U.S.'s BELCO company techniques, Ningbo engineering company Technology etc..
Because catalysis flue gas desulfurization and denitrification uses wet desulphurization, about 162~180 DEG C of desulfurizing tower entrance flue gas temperature need to disappear Consume a large amount of process waters to be cooled down, by washing, evaporation, final row's mouth temperature reaches the saturation temperature row under local atmospheric pressure Go out, form substantial amounts of white cigarette vapour, flue gas hangover is continuous hundreds of meters, and profile is in featheriness, and plume phenomenon is serious.
The content of the invention
In order to solve the defects such as plume phenomenon in the prior art is serious, the present invention, which is provided, a kind of to be eliminated catalytic unit desulfurization and takes off Nitre tower plume method.
In order to solve the above technical problems, the technical solution adopted in the present invention is as follows:
One kind eliminates catalytic unit desulphurization denitration tower plume method, and the flue-gas temperature that desulphurization denitration tower flue gas is exported is dropped to Less than 40 DEG C.
White cigarette is so can't see in summer, winter white cigarette can reduce 80%.Take cooling, it is possible to reduce desulphurization denitration tower Rate of water make-up, invests low, easily realizes.
Catalytic unit fume emission white cigarette causation analysis:Mouth flue gas relative humidity 100% is arranged, vapour content is high, Air is run into around chimney row's mouth, Water vapor condensation can produce vaporific white cigarette, and it is serious to trail.Containing a small amount of in other flue gas SO3, SO3Larger affinity is there is between molecule and hydrone, even if being also easy at relatively high temperatures and hydrone knot Conjunction forms H2SO4Molecule, and H2SO4There is also larger affinity between molecule and hydrone, easily act on forming acid mist with water. In based Wet Process Flue Gas, when containing gaseous state SO3Or H2SO4Flue gas by wet method fume desulfurizing system when, due to flue gas Rapidly it is cooled under acid dew point, this cooldown rate is than gaseous state SO3Or H2SO4The speed absorbed by absorption tower inner absorbent Much faster, therefore, SO3Or H2SO4It not only can not effectively remove, on the contrary can quickly form the submicron order for being difficult to trapping H2SO4Acid mist aerosol, while the sub-micron catalyst dust contained in flue gas, enhances H2SO4The forming process of aerosol. In general, the larger droplet of particle can be removed by absorption tower in acid mist, but to the aerosol droplet of submicron order Absorption tower is then helpless, and the droplet of the submicron order of formation can only be discharged into air by chimney.When containing submicron order droplet Flue gas be discharged to the atmosphere after, due to these mist droplet particle sizes and visible ray wavelength approach, can to light produce Rayleigh Scattering, is that the intensity of scattered light and the biquadratic of wavelength are inversely proportional the characteristics of Rayleigh scattering, the blue ray scattering of shortwave than The red light of long wave is many by force, final to cause chimney to be in blueness in the plume that sunlight irradiates side flue gas, and in the another of plume Side (transmissive side) is in yellowish-brown, here it is the reason for yellow or blue plume occur after wet desulphurization in some flue gases.
In the case where existing flue gas desulfurization and denitrification device can not further reduce Submicron Particles concentration of emission, except by Outside white plume in flue gas caused by water recovery, SO3The H of formation2SO4Aerosol turn into influence plume color and The topmost factor of opacity.
Applicant it has been investigated that, for catalytic cracking flue gas contain catalyst dust, SOXAnd NOXThe characteristics of, pass through drop Low desulphurization denitration tower slurry temperature come reduce desulphurization denitration tower flue gas outlet flue-gas temperature, can effectively eliminate plume.
Slurries are the mixtures that dust in DDGS, flue gas etc. is formed in desulfurization alkali lye, water, flue gas, namely alkali lye With the liquid material formed after water and smoke contacts, the application is to be realized by water and sodium hydroxide solution to flue gas initial stage Cooling and acidic materials etc. removal, when desulphurization denitration tower bottom slurries are more, will pass through loop slurry to realize to cigarette The removal of the cooling of gas and acidic materials etc., and sodium hydroxide is supplemented in real time, cost can so be significantly reduced.The application initial stage Alkali lye used is the sodium hydroxide solution that mass concentration is 20-30%, and alkali lye is to remove the acidic materials and powder in flue gas Dirt etc..
Slurry temperature reduction can also further reduce the loss of water, improve the reclamation rate of water, while making most of in flue gas Water cooling is reclaimed, and reduces flue gas water entrainment and salt fog particle, final to cause row's mouth temperature below 40 DEG C, so as to reach that flue gas is arranged Mouth takes on a new look, and eliminates plume.
There are three kinds of schemes on slurries cooling, one is to the direct cooling of slurries with cooling tower;Two be by evaporation type air cooling Device is cooled down to slurries;Three be that slurries are cooled down with pipe heat exchanger, and cooling medium is recirculated water.It is empty using vaporation-type There is floor space greatly in cooler, investment is high, and pressure drop is larger, and air cooling restrains the risk for having corrosive wear, need to increase lift of pump etc. Defect;Existed using pipe heat exchanger and invest high defect.It is directly cold to slurries using cooling tower in order to take into account cost and efficiency But.
As a kind of preferred concrete scheme of the application, catalytic unit desulphurization denitration tower plume method is eliminated, desulfurization takes off The middle part that the bottom of nitre tower is provided with provided with gas approach, top in exhanst gas outlet, desulphurization denitration tower is provided with high speed chilling nozzle, takes off Top in sulphur denitrating tower is provided with drop separator, is set between the interior high speed chilling nozzle and drop separator of desulphurization denitration tower There is filtering module;
The slurries of the bottom of desulphurization denitration tower are pumped into cooling tower by bottom of towe circulation, and slurries are carried out with cooling-sedimentation, then Be recycled into the middle part of desulphurization denitration tower by cooling tower circulating pump, and the cascade produced by high speed chilling nozzle, to from The flue gas of catalytic unit waste heat boiler carries out chilling, flue gas is saturated to 60 ± 3 DEG C;
While flue gas enters desulphurization denitration tower, to gas approach injection of ozone, make the nitrogen oxides in flue gas Into dinitrogen pentoxide, dinitrogen pentoxide enters desulphurization denitration tower tower with the sodium hydroxide lye reaction generation sodium nitrate in slurries In prime cement liquid, when the sodium hydrate content in slurries is less than 15%wt, sodium hydrate content in slurries need to be supplemented to 15% More than wt, the application is that the removal of cooling and acidic materials to flue gas etc. is realized by water and sodium hydroxide solution initial stage, When desulphurization denitration tower bottom slurries are more, it will pass through loop slurry to realize going for cooling and acidic materials to flue gas etc. Remove, and supplement sodium hydroxide in real time, cost can so be significantly reduced;
Contact of the flue gas with slurries realizes SO2With the removing of dust, afterwards flue gas enter filtering module in, filtering module The top of high speed chilling nozzle is arranged in the form of ring-type, during flue gas filtering module, due to gas expansion, causes water film to exist Condense, coalesce, so that water smoke fine dust be removed on fine dust;
It is by centrifuging that the free water droplet in gas is clear into drop separator after flue gas is by filtering module Remove, be ultimately discharged into air.
Above-mentioned and flue gas is saturated to 60 ± 3 DEG C, the saturation temperature for referring to flue gas row mouth at ambient pressure is about 60 ± 2 DEG C.
It is also precipitation process above by cooling tower cooling procedure, the sediment of cold water tower bottom is not to be recycled into desulfurization Denitrating tower, but discharged by the outlet of cold water tower bottom, and then further increase the clean-up effect to flue gas.
In order to further improve the efficiency of desulphurization denitration, the quantity of high speed chilling nozzle and filtering module is equal, one high One filtering module of fast chilling nozzle correspondence.
In order to further improve cooling effectiveness, the temperature of exhanst gas outlet flue gas is reduced, cooling tower is hollow atomizing without filling out Expect cooling tower.
It is preferred that, water collection device is provided between the high speed chilling nozzle and filtering module in desulphurization denitration tower.Can further it reduce Water loss and plume.
For extension fixture service life, cooling tower uses all-glass fibre reinforced plastic structure, and fastener used in cooling tower uses 316L Material, high speed chilling nozzle uses wear-and corrosion-resistant nozzle.
The discharge of solid material and slurries for convenience, while preventing putty, desulphurization denitration bottom of towe is vertebral body structure, desulfurization Denitration tower bottom is provided with solids outlet port and slurry discharge ports, and slurry discharge ports are located at the top of solids outlet port.
The NM technology of the present invention is with reference to prior art.
The present invention eliminates catalytic unit desulphurization denitration tower plume method, is effectively reduced water loss, and by desulphurization denitration tower The flue-gas temperature of exhanst gas outlet drops to less than 40 DEG C, eliminates plume, and cost is low, efficiency high;Catalyst in slurries etc. is being followed Ring can be deposited to cold water tower bottom into cooling tower cooling procedure, and be exhausted directly to after-treatment system, reduce in slurries and be catalyzed Agent, ss suspended solid equal size.
Brief description of the drawings
Fig. 1 is inventive desulfurization denitrating tower operation schematic diagram;
Fig. 2 is the winter of embodiment 1 reduction exhaust gas temperature design sketch (temperature is abscissa, and molar humidity is ordinate);
Fig. 3 is the summer of embodiment 1 reduction exhaust gas temperature design sketch (temperature is abscissa, and molar humidity is ordinate);
It is 1. the fresh water of supplement in figure;2. it is emergency episode fire water;3. it is that catalysis flue gas (is come from more than catalytic unit The flue gas of heat boiler);4. it is fresh alkali lye (25wt%NaOH alkali lye);5. it is ozone;6. it is haline water;1 is that flue gas arranges mouth;2 For drop separator;3 be filtering module;4 be filtering Module cycle pump;5 be bottom of towe slurry circulating pump;6 gas approach;7 be anxious Cold water spray section;8 be cooling tower;9 be cooling tower circulating pump, and 10 be high speed chilling nozzle, and 11 be desulphurization denitration tower.
Embodiment
For a better understanding of the present invention, with reference to the embodiment content that the present invention is furture elucidated, but the present invention Content is not limited solely to the following examples.
Embodiment 1
As shown in figure 1, the bottom of desulphurization denitration tower is provided with exhanst gas outlet, desulphurization denitration tower provided with gas approach, top Middle part be provided with high speed chilling nozzle, the top in desulphurization denitration tower is provided with drop separator, the interior high speed of desulphurization denitration tower Filtering module is provided between chilling nozzle and drop separator, water collection device is provided between high speed chilling nozzle and filtering module;It is high The quantity of fast chilling nozzle and filtering module is equal, high speed chilling nozzle one filtering module of correspondence.Cooling tower is hollow Atomizing cooling tower without filling material;Cooling tower uses all-glass fibre reinforced plastic structure, and fastener used in cooling tower uses 316L materials, anxious at a high speed Cold nozzle uses wear-and corrosion-resistant nozzle;Desulphurization denitration bottom of towe is vertebral body structure, desulphurization denitration tower bottom provided with solids outlet port and Slurry discharge ports, slurry discharge ports are located at the top of solids outlet port.
Eliminate catalytic unit desulphurization denitration tower plume method:The slurries of the bottom of desulphurization denitration tower pass through bottom of towe serum recycle It is pumped into after cooling tower cooled down, the middle part of desulphurization denitration tower is recycled into by cooling tower circulating pump, passes through high speed chilling The cascade that nozzle is produced, carries out chilling to import flue gas, flue gas is saturated to about 60 DEG C, the slurries of the bottom of desulphurization denitration tower are pressed Recycled according to preceding method;By the haline water obtained by the slurries sedimentation of desulphurization denitration tower bottom and cooling tower inner bottom part slurries institute Haline water discharge obtained by sedimentation is handled, to improve the treatment and purification ability of slurries;
While flue gas enters desulphurization denitration tower, to gas approach injection of ozone, make the nitrogen oxides in flue gas Into dinitrogen pentoxide, dinitrogen pentoxide enters desulphurization denitration tower tower with the sodium hydroxide lye reaction generation sodium nitrate in slurries In prime cement liquid;
Contact of the flue gas with slurries realizes SO2With the removing of dust, afterwards flue gas enter filtering module in, filtering module The top of high speed chilling nozzle is arranged in the form of ring-type, when flue gas is by filtering module, due to gas expansion, causes water thin Film condenses on fine dust, coalesces, so that water smoke fine dust be removed;
It is by centrifuging that the free water droplet in gas is clear into drop separator after flue gas is by filtering module Remove,
Air is ultimately discharged into, the flue-gas temperature of desulphurization denitration tower flue gas outlet is below 40 DEG C.
Curve a is saturated humidity line in Fig. 2, Fig. 3,
E1:51.8 DEG C of flue-gas temperature, relative humidity 100%
E2:40 DEG C of flue-gas temperature, relative humidity 100%
D1:5 DEG C of atmospheric temperature, relative humidity 30%
D2:25 DEG C of atmospheric temperature, relative humidity 60%
As can be seen from Figure, take reduction row's mouth flue-gas temperature to less than 40 DEG C, white cigarette (plume), winter are can't see in summer White cigarette can reduce 80%, and take cooling, it is possible to reduce the rate of water make-up of desulphurization denitration tower, invest low, easily realize.

Claims (9)

1. one kind eliminates catalytic unit desulphurization denitration tower plume method, it is characterised in that:The cigarette that desulphurization denitration tower flue gas is exported Temperature degree drops to less than 40 DEG C.
2. catalytic unit desulphurization denitration tower plume method is eliminated as claimed in claim 1, it is characterised in that:By reducing desulfurization Denitrating tower slurry temperature come reduce desulphurization denitration tower flue gas outlet flue-gas temperature.
3. catalytic unit desulphurization denitration tower plume method is eliminated as claimed in claim 2, it is characterised in that:Using cooling tower pair Slurries are directly cooled down.
4. the elimination catalytic unit desulphurization denitration tower plume method as described in claim 1-3 any one, it is characterised in that:It is de- Sprayed provided with high speed chilling at the middle part that the bottom of sulphur denitrating tower is provided with provided with gas approach, top in exhanst gas outlet, desulphurization denitration tower Top in mouth, desulphurization denitration tower is provided with drop separator, the interior high speed chilling nozzle and drop separator of desulphurization denitration tower Between be provided with filtering module;
The slurries of the bottom of desulphurization denitration tower are pumped into cooling tower by bottom of towe circulation, carry out cooling-sedimentation to slurries, then pass through Cooling tower circulating pump is recycled into the middle part of desulphurization denitration tower, and the cascade produced by high speed chilling nozzle, to carrying out self-catalysis The flue gas of device by utilizing waste heat boiler carries out chilling, flue gas is saturated to 60 ± 3 DEG C;
While flue gas enters desulphurization denitration tower, to gas approach injection of ozone, make nitrogen oxides in flue gas into five Nitrous oxide;
Contact of the flue gas with slurries realizes SO2With the removing of dust, afterwards flue gas enter filtering module in, filtering module is with ring The form of shape is arranged in the top of high speed chilling nozzle, during flue gas filtering module, due to gas expansion, causes water film in fine powder Condense, coalesce, so that water smoke fine dust be removed on dirt;
After flue gas is by filtering module, into drop separator, the free water droplet in gas is removed by centrifuging, most Air is discharged into eventually.
5. catalytic unit desulphurization denitration tower plume method is eliminated as claimed in claim 4, it is characterised in that:High speed chilling nozzle It is equal with the quantity of filtering module, high speed chilling nozzle one filtering module of correspondence.
6. catalytic unit desulphurization denitration tower plume method is eliminated as claimed in claim 4, it is characterised in that:Cooling tower is hollow Atomizing cooling tower without filling material.
7. catalytic unit desulphurization denitration tower plume method is eliminated as claimed in claim 4, it is characterised in that:In desulphurization denitration tower High speed chilling nozzle and filtering module between be provided with water collection device.
8. catalytic unit desulphurization denitration tower plume method is eliminated as claimed in claim 4, it is characterised in that:Cooling tower is using complete Glass fibre reinforced plastic structure, fastener used in cooling tower uses 316L materials, and high speed chilling nozzle uses wear-and corrosion-resistant nozzle.
9. catalytic unit desulphurization denitration tower plume method is eliminated as claimed in claim 4, it is characterised in that:Desulphurization denitration bottom of towe For vertebral body structure, desulphurization denitration tower bottom is provided with solids outlet port and slurry discharge ports, and slurry discharge ports are located at solids outlet port Top.
CN201710625370.8A 2017-07-27 2017-07-27 Method for eliminating smoke plume of desulfurization and denitrification tower of catalytic device Active CN107233791B (en)

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Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1424131A (en) * 2002-12-23 2003-06-18 浙江大学 White smoke treating device
CN201711085U (en) * 2010-05-20 2011-01-19 贾玉德 Eddy current reflective strengthening mass transfer dust removal desulfurization device
KR20110108971A (en) * 2010-03-30 2011-10-06 현대제철 주식회사 Dust collecting apparatus
EP2918327A1 (en) * 2014-03-11 2015-09-16 Abdelkader Ben Brahim Method for purifying gaseous effluents by selective removal of the pollutants contained therein
CN105013311A (en) * 2015-07-28 2015-11-04 青岛京润石化工程有限公司 Flue gas desulfurization dust and mist removal method
CN206008424U (en) * 2016-08-16 2017-03-15 安徽锐隆环保科技有限公司 A kind of while component to flue gas desulfurization and denitrification
CN106621724A (en) * 2017-01-17 2017-05-10 江苏亿金环保科技有限公司 Flue gas desulfurization and dust-whitening integrated device

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1424131A (en) * 2002-12-23 2003-06-18 浙江大学 White smoke treating device
KR20110108971A (en) * 2010-03-30 2011-10-06 현대제철 주식회사 Dust collecting apparatus
CN201711085U (en) * 2010-05-20 2011-01-19 贾玉德 Eddy current reflective strengthening mass transfer dust removal desulfurization device
EP2918327A1 (en) * 2014-03-11 2015-09-16 Abdelkader Ben Brahim Method for purifying gaseous effluents by selective removal of the pollutants contained therein
CN105013311A (en) * 2015-07-28 2015-11-04 青岛京润石化工程有限公司 Flue gas desulfurization dust and mist removal method
CN206008424U (en) * 2016-08-16 2017-03-15 安徽锐隆环保科技有限公司 A kind of while component to flue gas desulfurization and denitrification
CN106621724A (en) * 2017-01-17 2017-05-10 江苏亿金环保科技有限公司 Flue gas desulfurization and dust-whitening integrated device

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