CN107433128A - A kind of flue gas desulfurization and denitrification group technology of high usage - Google Patents
A kind of flue gas desulfurization and denitrification group technology of high usage Download PDFInfo
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- CN107433128A CN107433128A CN201710743656.6A CN201710743656A CN107433128A CN 107433128 A CN107433128 A CN 107433128A CN 201710743656 A CN201710743656 A CN 201710743656A CN 107433128 A CN107433128 A CN 107433128A
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- flue gas
- desulfurization
- ammonia
- ammonia process
- chilling
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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
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
- B01D53/86—Catalytic processes
- B01D53/8621—Removing nitrogen compounds
- B01D53/8625—Nitrogen oxides
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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
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/46—Removing components of defined structure
- B01D53/48—Sulfur compounds
- B01D53/50—Sulfur oxides
- B01D53/501—Sulfur oxides by treating the gases with a solution or a suspension of an alkali or earth-alkali or ammonium compound
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2251/00—Reactants
- B01D2251/20—Reductants
- B01D2251/206—Ammonium compounds
- B01D2251/2062—Ammonia
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- Environmental & Geological Engineering (AREA)
- Health & Medical Sciences (AREA)
- Biomedical Technology (AREA)
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- General Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Treating Waste Gases (AREA)
Abstract
The present invention provides a kind of flue gas desulfurization and denitrification group technology that can realize gas cleaning process high usage, flue gas is subjected to the ammonia process of desulfurization, ammonia process of desulfurization discharge concentration ammonium sulfate solution is filtered, evaporative crystallization, produce ammonium sulfate products, the condensate-water polishing of evaporation returns to ammonia process of desulfurization unit.The technique that this discovery provides is by denitrating flue gas, the ammonia process of desulfurization and other demisting random incorporations, display one's respective advantages, the defects of every kind of technology, has made up, the ammonia of denitration escape is absorbed by ammonia process of desulfurization circulation fluid, the ammonia of ammonia process of desulfurization escape, which is recovered, to be returned in desulphurization circulating liquid, the target of high usage is realized, while byproduct technical grade sulphur ammonium has certain economic value.
Description
Technical field
The present invention relates to the flue gas purifying technique that a kind of SCR (selective catalytic reduction) denitration, the ammonia process of desulfurization are combined, use
In industrial furnace smoke desulphurization and denitration, belong to field of Environment Protection.
Background technology
Worsening atmospheric environment is administered, controls SOx, NOx, particulate matter (hereinafter referred to as PM) etc. in industrial furnace smoke
The discharge of pollutant, it is the most important thing of current atmospheric pollution control.At present, the flue gases purification of domestic and international various main flows,
Such as power plant's SCR denitration, FGD (flue gas desulfurization) technique, oil plant catalysis flue gas wet desulphurization process, although these technologies are relative
Comparative maturity, industrial achievement is a lot, but these technologies generally existing purifying smoke PM are higher, NH3、SO3Remove not thorough, cigarette
Gas band " tail feathers, blue smoke " phenomenon, while outer row saline sewage TN (total nitrogen content) is exceeded, sulfate discharge causes neighboring area salt
Alkalization.
The content of the invention
The technical problem to be solved in the present invention is to provide a kind of flue gas that can realize gas cleaning process high usage to take off
Sulphur denitration group technology, reaches sewage zero-discharge, realizes energy-conserving and environment-protective.
In order to solve the above-mentioned technical problem, the technical scheme is that providing a kind of flue gas desulfurization and denitrification of high usage
Group technology, it is characterised in that：It is made up of following three step：
Step 1：Ammoniacal liquor-selective catalytic reduction SCR denitration
Flue gas is subjected to SCR denitration first；
Step 2：The ammonia process of desulfurization
By the flue gas cool-down after denitration, the ammonia process of desulfurization is then carried out, the flue gas after desulfurization, which carries out purification, makes flue gas row up to standard
Put；
Step 3：Sewage water filtration-sulphur ammonium crystallizing and drying
Ammonia process of desulfurization discharge concentration ammonium sulfate solution is filtered, evaporative crystallization, produce ammonium sulfate products；The condensate of evaporation returns
Receive and return to ammonia process of desulfurization unit.
Preferably, step 1 detailed process is as follows：Flue gas drops to 300~400 DEG C after residual heat boiler for exchanging heat, with warp
The air-atomized ammoniacal liquor mixing of overcompression, mixed gas is after the flue cowling panel in waste heat boiler even into SCR reactors
Bed, under SCR catalyst effect, NOx chemically reacts with NH3, generates N2 and H2O, completes flue gas SCR denitration process；
SCR reactor beds sootblowing dielectric uses compressed air, and compressed air reaches 300 with SCR reactor outlet flue gas heat exchanges first
Enter soot blower after more than DEG C.
Preferably, step 2 detailed process is as follows：Flue gas further exchanges heat through waste heat boiler and is cooled to 200 after denitration
Below DEG C, two chilling concentration, ammonia process of desulfurization steps completion purification process are then passed sequentially through, it is specific as follows：
Step 2.1：Chilling concentrates
The circulation ammonium sulfate solution that flue gas from heat boiler outlet first sprays with chilling nozzle is mixed, and flue gas is chilled to
50~70 DEG C, while circulating the moisture evaporation in ammonium sulfate solution makes sulphur ammonium further concentrate；The circulation ammonium sulfate solution of concentration is fallen into
In chilling tower reactor, pumped is circulated by chilling, a part is recycled back to chilling nozzle, and another part carries out step 3 and handled；
Step 2.2：The ammonia process of desulfurization
Flue gas after chilling enters absorption-oxidized portion through chimney tower tray, circulates and inhales with the atomization sprayed by absorption nozzle
Receive liquid-ammonium sulfate solution to be in contact, complete desulfurizing and purifying process, wherein SO2 and NH3 generation ammonium sulfites, contain ammonium sulfite
Circulating absorption solution flows into oxidation tank, by sulfite oxidation is sulphur ammonium by the oxidation air at oxidation tank bottom；Circulation in oxidation tank
Absorbing liquid is most of to return absorption nozzle through circulating pump pressurized circulation, and remainder overflow is expelled in chilling tower reactor；In oxidation tank
Ammoniacal liquor and fresh water is continuously replenished；
Preferably, in step 2.2 ammonia process of desulfurization, absorption nozzle uses horizontal bidirectional atomizer, and jet angle is
140 °~150 °.
Preferably, in step 2.2 ammonia process of desulfurization, oxidation tank oxidation uses jet aeration mode of oxidizing.
Preferably, step 3 detailed process is as follows：The sulphur ammonium concentrate discharged by the chilling tower reactor, which first passes around, to be covered
Film filter filters, and filter cake is evaporated crystallization and drying process as solid waste processing, filtrate, and the moisture of evaporation is through cold
Solidifying to be recycled to the oxidation tank, the pack of sulphur ammonium solid is sold as product.
Preferably, the overlay film filter is provided with two, and the circulation work flow of the overlay film filter is as follows：Feed liquor-
Cleaning-backflow overlay film-filtering-discharge opeing-drying-pressure release-deslagging-flushing.
Preferably, the filtrate evaporative crystallization processing is using mechanical steam recompression evaporation or multiple-effect evaporation mode.
Preferably, the drying process is using vibrations fluid bed or forced air drying mode.
Technique provided by the invention overcomes the deficiencies in the prior art, and flue gas SCR denitration, the ammonia process of desulfurization and wet type electricity are removed
Mist organically combines, and has played the advantage of three kinds of technologies, and is made up the defects of every kind of technology by other two kinds of technologies, and SCR takes off
The ammonia of nitre escape is absorbed by ammonia process of desulfurization circulation fluid, and the ammonia of ammonia process of desulfurization escape is reclaimed by wet type electricity demisting returns to ammonia process
In desulphurization circulating liquid, two kinds of technologies have been implemented in combination with the target of real discharge, while by-product technical grade sulphur ammonium, have necessarily
Economic benefit.
Brief description of the drawings
Fig. 1 is the flue gas desulfurization and denitrification group technology flow chart of high usage provided by the invention.
Embodiment
To become apparent the present invention, hereby with a preferred embodiment, and accompanying drawing is coordinated to be described in detail below.
Fig. 1 is the flue gas desulfurization and denitrification group technology flow chart of near-zero release provided by the invention, and in Fig. 1,1st area is ammonia
Water-SCR denitration area, 2nd area are that the ammonia process of desulfurization-wet type electricity removes fog-zone, and 3rd area are sewage water filtration-sulphur ammonium crystallizing and drying area；Described
The flue gas desulfurization and denitrification group technology of near-zero release is combined SCR denitration, the ammonia process of desulfurization and wet type electricity demisting technique, only
Change process includes industrial smoke SCR denitration first, and the ammonia process of desulfurization is then carried out after flue gas cool-down, and flue gas after desulfurization enters wet type electricity
Demisting, by the pollutant removings such as SOx, NOx and PM in flue gas, qualified discharge；The concentration ammonium sulfate solution of ammonia process of desulfurization discharge
Filtered, evaporative crystallization, ammonium sulfate products are produced, the condensate-water polishing of evaporation returns to ammonia process of desulfurization unit, and detailed process is as follows：
The first step：Ammoniacal liquor-SCR denitration
The present invention is unlike the ammoniacal liquor SCR denitration of routine：SCR reaction beds sootblowing dielectric uses plant compressed air
PA, PA pass through the flue gas heat exchange with SCR reactor outlets to more than 300 DEG C, into soot blower；Remaining SCR denitration part and routine
Ammoniacal liquor SCR denitration technique it is identical.
As shown in 1st area in Fig. 1, the flue gas a from upstream equipment exchanges heat to 300~400 DEG C by waste heat boiler 1-5,
Ammoniacal liquor b from ammoniacal liquor supply system 1-1 mixes with compressed air PA, and into ammonia-spraying grid 1-2, compressed air is by ammoniacal liquor mist
Change, be dispersed in 300~400 DEG C of flue gas, ammoniacal liquor vaporization, ammonia, vapor and flue gas after vaporization form single gas
Phase, mixed gas, even into SCR reactor 1-4 beds, are made through the flue cowling panel 1-3 in waste heat boiler in SCR catalyst
Under, NH3 and NOx reacts, and generates N2 and H2O, completes denitrification process, flue gas further exchanges heat through waste heat boiler 1-5 after denitration
Less than 200 DEG C are cooled to, subsequently into the ammonia process of desulfurization-area of wet-esp area 2.
The ammonia concn that ammoniacal liquor supply system 1-1 is confessed be 2%~10% or so, ammonia-spraying grid 1-3 spray ammoniacal liquor and
Both compressed air PA volume ratio 1: 100~1: 1000, the reaction temperature of SCR reactor 1-4 beds is 300~380 DEG C.
Second step：The ammonia process of desulfurization-wet type electricity demisting
As shown in 2nd area in Fig. 1, the ammonia process of desulfurization-wet type electricity is except fog-zone is by chilling enrichment region 2-10, ammonia process of desulfurization area 2-
20th, wet type is electric except fog-zone 2-30 three parts are formed by connecting.It is complete that flue gas from waste heat boiler 1-5 outlets passes sequentially through three parts
It is as follows into purification process, detailed process：
Chilling enrichment region 2-10 parts：Flue gas from waste heat boiler 1-5 outlets first follows with what chilling nozzle 2-11 sprayed
Epithio ammonium salt solution mixes, and flue gas is cooled to 50~70 DEG C, circulates moisture in ammonium sulfate solution and is volatized into flue gas, circulation sulphur ammonium is molten
Sulphur ammonium concentration in liquid is further improved, and the circulation ammonium sulfate solution of concentration is fallen into chilling tower reactor 2-12, by chilling circulating pump 2-
13 extract out, and a part is recycled back to chilling nozzle 2-11, and a part is expelled to sewage water filtration-area of sulphur ammonium crystallizing and drying 3；
Ammonia process of desulfurization area 2-20 parts：After the flue gas come from chilling enrichment region 2-10 is first by chimney tower tray 2-21, with
The circulating absorption solution contact that four layers of nozzle 2-22 spray, completes desulfurizing and purifying process, absorbs SO2 circulation fluid through chimney tower tray
Oxidation tank 2-23, oxidation pot bottom arrangement oxidation injector 2-24, the air from oxidation fan 2-25 are flowed into after 2-21 liquid collectings
Mixed with oxidation cycle pump 2-26 circulation fluid in oxidation injector 2-24, ammonium sulfurous are oxidized to sulphur ammonium, most of circulation
Liquid is extracted out by oxidation tank 2-23 bottoms, and nozzle 2-22 is returned through ammonia process of desulfurization circulating pump 2-27 pressurized circulations, small part circulation fluid by
The overfall overflow of oxidation tank 2-23 tops is in chilling tower reactor 2-12.Oxidation tank 2-23 continuous supplementations ammoniacal liquor and fresh water c, maintain
Circulation fluid composition is stable.
Absorption nozzle 2-22 uses horizontal bidirectional atomizer, and jet angle is 140 °~150 °.Oxidation tank 2-23 oxidations are adopted
With jet aeration mode of oxidizing, dissolved oxygen efficiency is more than 35%.
Wet type electricity removes fog-zone 2-30 parts：The flue gas come from ammonia process of desulfurization area 2-20 passes through smoke distribution disk 2-31 first
Afterwards, into wet type electrostatic precipitator 2-32, under electric field action, water smoke, tiny PM, SO3 acid mist, escape ammonia in flue gas are taken off
Remove, purifying smoke d is finally discharged into air through chimney 2-33, and the pollutant that wet type electrostatic precipitator 2-32 dust collecting electrodes are collected is by wet type
Water spray at the top of electrostatic precipitator 2-32 pours ammonia process of desulfurization area 2-20.
Wet type electrostatic precipitator 2-32 outlets use blade demister.
3rd step：Sewage water filtration-sulphur ammonium crystallizing and drying
Overlay film filter 3-1 filterings are first passed around by the chilling enrichment region 2-10 sulphur ammonium concentrates discharged, removed in solution
Solid PM, the solid PM filtered out be aqueous 40% or so dry slag.Overlay film filter 3-1 totally 2, by following for PLC controls
Ring workflow is as follows：Feed liquor-cleaning-backflow overlay film-filtering-discharge opeing-drying-pressure release-deslagging-flushing.
The filter cake filtered out drains into solid waste case 3-2 as solid waste e processing, the suspension of the sulphur ammonium concentrate after filtering
TSS (total suspended matter) is less than 20mg/L, and sulphur ammonium concentration is more than 25%, and sulphur ammonium concentrate enters sulphur ammonium evaporative crystallization-drying bag
Part 3-3 is filled, ammonium sulfate solution evaporative crystallization is evaporated using MVR (mechanical steam recompression) or multiple-effect evaporation mode, sulphur ammonium knot
Crystalline substance is dried using vibrations fluid bed, forced air drying mode, and the moisture evaporation in concentrate is vapor, and is condensed into condensate,
Oxidation tank 2-23 is back to, sulphur ammonium is sold outside as product f.
To realize the efficient utilization of gas cleaning process, the present invention proposes one on the basis of domestic and international similar technique is summarized
Kind SCR denitration, ammonia process of desulfurization flue gas purifying technique, while by-product sulphur ammonium, flue gas PM is less than 5mg/Nm after purification3- dry (3%
O2), SOx is less than 20mg/Nm3- dry (3%O2), NOx is less than 50mg/Nm3- dry (3%O2), utilization rate height and trade effluent zero
Discharge, above-mentioned overall target is that domestic and international similar technique can not be realized.
Claims (5)
- A kind of 1. flue gas desulfurization and denitrification group technology of high usage, it is characterised in that：It is made up of following three step：Step 1：Ammonia Flue gas is carried out SCR denitration by water-selective catalytic reduction SCR denitration first；Step 2：The ammonia process of desulfurization-by the flue gas after denitration Cooling, then carries out the ammonia process of desulfurization；Step 3：The concentration ammonium sulfate solution warp of sewage water filtration-sulphur ammonium crystallizing and drying ammonia process of desulfurization discharge Filtering, evaporative crystallization, produce ammonium sulfate products；The condensate-water polishing of evaporation returns to ammonia process of desulfurization unit.
- A kind of 2. flue gas desulfurization and denitrification group technology of high usage as claimed in claim 1, it is characterised in that：The step 1 detailed process is as follows：Flue gas drops to 300~400 DEG C after waste heat boiler (1-5) heat exchange, with the ammonia by compressed air atomization Water mixes, and mixed gas is after the flue cowling panel (1-3) in waste heat boiler (1-5) even into SCR reactors (1-4) bed Layer, under SCR catalyst effect, NOx chemically reacts with NH3, generates N2 and H2O, completes flue gas SCR denitration process；SCR Reactor (1-4) bed sootblowing dielectric uses compressed air, and compressed air exchanges heat with SCR reactors (1-4) exiting flue gas first Enter soot blower after reaching more than 300 DEG C.
- A kind of 3. flue gas desulfurization and denitrification group technology of high usage as claimed in claim 2, it is characterised in that：The step 2 detailed processes are as follows：Through waste heat boiler (1-5), further heat exchange is cooled to less than 200 DEG C to flue gas after denitration, then passes sequentially through Three chilling concentration, the ammonia process of desulfurization, wet type electricity demisting steps complete purification process, specific as follows：Step 2.1：Chilling concentration comes The circulation ammonium sulfate solution first sprayed from the flue gas of waste heat boiler (1-5) outlet with chilling nozzle (2-11) mixes, and flue gas is by chilling To 50~70 DEG C, while circulating the moisture evaporation in ammonium sulfate solution makes sulphur ammonium further concentrate；The circulation ammonium sulfate solution of concentration falls Enter in chilling tower reactor (2-12), extracted out by chilling circulating pump (2-13), a part is recycled back to chilling nozzle (2-11), another part Step 3 is carried out to handle；Step 2.2：Flue gas after ammonia process of desulfurization chilling enters absorption-oxidized portion through chimney tower tray (2-21), It is in contact with the atomization circulating absorption solution-ammonium sulfate solution sprayed by absorption nozzle (2-22), completes desulfurizing and purifying process, wherein SO2 and NH3 generation ammonium sulfites, the circulating absorption solution containing ammonium sulfite flows into oxidation tank (2-23), by oxidation tank (2-23) Sulfite oxidation is sulphur ammonium by the oxidation air at bottom；Circulating absorption solution in oxidation tank (2-23) largely pressurizes through circulating pump Absorption nozzle (2-22) is recycled back to, remainder overflow is expelled in chilling tower reactor (2-12)；Constantly mended in oxidation tank (2-23) Fill ammoniacal liquor and fresh water.
- A kind of 4. flue gas desulfurization and denitrification group technology of high usage as claimed in claim 3, it is characterised in that：The step In 2.2 ammonia process of desulfurizations, absorption nozzle (2-22) uses horizontal bidirectional atomizer, and jet angle is 140 °~150 °.
- A kind of 5. flue gas desulfurization and denitrification group technology of high usage as claimed in claim 3, it is characterised in that：The step In 2.2 ammonia process of desulfurizations, oxidation tank (2-23) oxidation uses jet aeration mode of oxidizing.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109999634A (en) * | 2019-04-19 | 2019-07-12 | 西安西矿环保科技有限公司 | One kind being used for cement SCR denitration and exhaust treatment system |
| CN113289475A (en) * | 2021-05-13 | 2021-08-24 | 天津中材工程研究中心有限公司 | Method for reducing ammonia escape after SNCR or SCR denitration |
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| CN103212284A (en) * | 2013-03-15 | 2013-07-24 | 孙琦 | Method and device for combined removal of nitric oxide and sulfide in flue gas |
| CN104801162A (en) * | 2015-04-07 | 2015-07-29 | 田晓良 | Near-zero emission combined technology of smoke desulfuration and denitration |
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2017
- 2017-08-25 CN CN201710743656.6A patent/CN107433128A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103212284A (en) * | 2013-03-15 | 2013-07-24 | 孙琦 | Method and device for combined removal of nitric oxide and sulfide in flue gas |
| CN104801162A (en) * | 2015-04-07 | 2015-07-29 | 田晓良 | Near-zero emission combined technology of smoke desulfuration and denitration |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109999634A (en) * | 2019-04-19 | 2019-07-12 | 西安西矿环保科技有限公司 | One kind being used for cement SCR denitration and exhaust treatment system |
| CN113289475A (en) * | 2021-05-13 | 2021-08-24 | 天津中材工程研究中心有限公司 | Method for reducing ammonia escape after SNCR or SCR denitration |
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Application publication date: 20171205 |