CN105597533A - Device for denitration heating blend technology - Google Patents
Device for denitration heating blend technology Download PDFInfo
- Publication number
- CN105597533A CN105597533A CN201610148612.4A CN201610148612A CN105597533A CN 105597533 A CN105597533 A CN 105597533A CN 201610148612 A CN201610148612 A CN 201610148612A CN 105597533 A CN105597533 A CN 105597533A
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- CN
- China
- Prior art keywords
- flue gas
- denitration
- thermal process
- heat
- exchange unit
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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
-
- 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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- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Health & Medical Sciences (AREA)
- Biomedical Technology (AREA)
- Analytical Chemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Chimneys And Flues (AREA)
Abstract
The invention discloses a device for a denitration heating blend technology. The device comprises a gas-gas heater (GGH), a burner, a heating blend device, an entrance flue, an ammonia spraying grid, an SCR reactor and an exit flue, wherein the exit flue is connected with the entrance flue through the gas-gas heater; the heating blend device is provided with the burner; the ammonia spraying grid is arranged in the entrance flue; the tail end of the entrance flue is connected with the SCR reactor; the tail end of the SCR reactor is connected with one end of the exit flue; the other end of the exit flue is connected with the lower side of the gas-gas heater. The device can ensure the usage of SCR denitration system under lower temperature, NOx discharge is reduced, the heat use ratio is increased and the energy consumption is reduced.
Description
Technical field
The invention belongs to flue gas desulfurization technique field, be specifically related to a kind of device for the mixed thermal process of low-temperature denitration.
Background technology
Selective catalytic reduction (SCR) denitration technology is the most reliable at most technology of current denitrating flue gas application, simple in structure, denitration efficiency is high, reliable. SCR denitration technology is under catalyst action, by reducing agent, reduction of nitrogen oxide is become to nitrogen, thereby reaches the object of denitrating flue gas. Common SCR denitrating system is usually placed between the economizer and air preheater of boiler, and reaction temperature is 350 ° of C left and right, and its denitration efficiency can reach more than 90%. But also exist following shortcoming: catalyst is subject to for a long time the wearing and tearing of dust and the erosion of alkali/alkaline earth metal is easily poisoning; Need steam generator system reserved larger arrangement space between economizer and air preheater; There is certain thermal loss; Between the active region of catalyst, be between 300-420 ° of C, exceed this temperature range, catalyst does not have activity, and denitration reaction can not carry out.
CN204365119U discloses a kind of coke oven flue gas denitration desulfurization and reheat system process unit, be connected and form by SCR Benitration reactor, GGH flue gas heat-exchange unit, desulfurizing tower, ammoniacal liquor evaporimeter, the empty blender of ammonia, dilution air, ammoniacal liquor thinning tank, aqua ammonia pump, booster fan, flue gas transfer valve, chimney and pipeline, have and can make full use of plant area's deposed ammonia and fume waste heat, reach denitration desulfurization object, improve denitration desulfuration efficiency, reduce operating cost, avoid the advantages such as system corrosion.
CN203437036U discloses a kind of sintering flue gas desulfurization denitrification apparatus, and it comprises pre-duster, GGH heat exchanger, burner, ammonia injector, SCR reactor, recirculating fluidized bed absorption tower, atomizer, cyclone separator, calcium-base absorbing agent warehouse, sack cleaner and chimney; Wherein, described pre-duster, GGH heat exchanger, burner, SCR reactor, recirculating fluidized bed absorption tower, cyclone separator, sack cleaner are connected successively with chimney.
But, in above-mentioned patent, conventionally cannot normally use below C time at 300 ° in flue-gas temperature for the device of the out of stock mixed thermal process of flue gas, thereby can cause out of stock inefficiency, nitrogen oxide emission is too high.
For overcoming the defect of prior art, the invention provides a kind of device for the mixed thermal process of low-temperature denitration.
Summary of the invention
The object of the invention is to solve the defect that the device of the mixed thermal process of existing denitration can not normally use at low temperatures, ensure denitration efficiency, reduce NOxDischarge.
First the present invention provides a kind of device for the mixed thermal process of denitration, comprise that flue gas heat-exchange unit (GGH), burner, mixed hot charging are put, gas approach, ammonia-spraying grid, SCR reactor and exhaust pass, described exhaust pass (10) is connected by flue gas heat-exchange unit (2) with gas approach (6), described mixed hot charging is put and is also connected with burner, in described gas approach, be provided with ammonia-spraying grid, gas approach end is connected with SCR reactor, SCR reactor end is connected with exhaust pass one end, and the exhaust pass other end is connected to flue gas heat-exchange unit downside.
Preferably, described flue gas heat-exchange unit is provided with smoke inlet.
Preferably, described ammonia-spraying grid one side is provided with ammonia entrance.
Preferably, described burner be arranged on that mixed hot charging puts after.
Preferably, described gas approach and mixed hot charging are provided with expansion joint between putting.
Preferably, between described gas approach and SCR reactor, be provided with expansion joint.
Preferably, between described SCR reactor and exhaust pass, be provided with expansion joint.
Preferably, in described SCR reactor, be provided with catalyst, described catalyst can be one deck or two-layer.
Also one side of the present invention provides a kind of out of stock mixed thermal process of low temperature that adopts device of the present invention, comprising:
1) adopt GGH to heat up in advance to inlet flue gas, preferred, adopt GGH to be warming up in advance 190-230 ° of C to inlet flue gas;
2) use burner generation high temperature air and flue gas to mix heat, make flue gas reach 300 ° more than C;
3) adopt GGH to carry out recuperation of heat utilization to outlet flue gas.
The present invention goes out to arrange GGH at reactor inlet and exhaust pass, the flue gas of reactor inlet and outlet carries out heat exchange, the preliminary entrance flue gas temperature that improves, then arranges burner, produces high temperature air, mix heat with inlet flue gas, rate of heat exchange approaches 100%, has reduced heat loss, and inlet flue gas enters reactor after reaching the temperature of catalyst requirement, with after ammonia gas react, enter GGH by reactor outlet, after cooling, enter atmosphere.
The present invention has ensured coming into operation of SCR denitrating system, has reduced NOxDischarge, has improved heat utilization efficiency, reduces energy consumption.
Brief description of the drawings
Fig. 1 is structural representation of the present invention;
1-smoke inlet; 2-flue gas heat-exchange unit; 3-burner; The mixed hot charging of 4-is put; 5-expansion joint; 6-gas approach; 7-ammonia-spraying grid; 8-SCR reactor; 9-catalyst; 10-exhaust pass.
Detailed description of the invention
Below in conjunction with the drawings and specific embodiments, the present invention is further described.
A kind of device for the mixed thermal process of low-temperature denitration as shown in Figure 1, mainly by flue gas heat-exchange unit 2, burner 3, mixed hot charging put 4, expansion joint 5, gas approach 6, ammonia-spraying grid 7, SCR reactor 8 and exhaust pass 10 form; Exhanst gas outlet flue 10 is connected by flue gas heat-exchange unit 2 with gas approach 6, described mixed hot charging is put 4 connection burners 3, in described gas approach 6, be provided with ammonia-spraying grid 7, gas approach 6 ends are connected with SCR reactor 8, the last side of SCR reactor 8 is connected with exhaust pass 10 one end, and exhaust pass 10 other ends are connected to flue gas heat-exchange unit 2 downsides; Flue gas heat-exchange unit 2 is provided with smoke inlet 1, and ammonia-spraying grid 7 one sides are provided with ammonia entrance; Between gas approach and mixed hot charging are put, between gas approach and SCR reactor, be provided with expansion joint between SCR reactor and exhaust pass; In SCR reactor, be provided with 2 layers of catalyst.
When flue gas being carried out when out of stock, adopt GGH first inlet flue gas to be heated up in advance, wherein to fix tentatively be 150 ° of C to inlet flue gas, it is 360 ° of C that outlet flue gas is fixed tentatively, and is upgraded to 220 ° of C left and right by inlet flue gas after GGH; Use burner to produce high temperature air and inlet flue gas and mix hotly, ensure that 300 ° of active temperatures that inlet flue gas reaches catalyst requirement are more than C, fixing tentatively is 360 ° of C; Outlet flue gas (220 ° of C left and right) is carried out to recuperation of heat utilization.
Claims (10)
1. the device for the mixed thermal process of denitration, comprise flue gas heat-exchange unit (2), mixed hot charging is put (3), gas approach (6), SCR reactor (8) and exhaust pass (10), it is characterized in that, described exhaust pass (10) is connected by flue gas heat-exchange unit (2) with gas approach (6), described mixed hot charging is put (3) and is also connected with burner (4), in described gas approach (6), ammonia-spraying grid (7) is set, gas approach (6) end is connected with SCR reactor (8), SCR reactor (8) end is connected with exhaust pass (10) one end, exhaust pass (10) other end is connected to flue gas heat-exchange unit (2) downside.
2. a kind of device for the mixed thermal process of denitration claimed in claim 1, is characterized in that, described flue gas heat-exchange unit (2) is provided with smoke inlet (1).
3. a kind of device for the mixed thermal process of denitration claimed in claim 1, is characterized in that, described ammonia-spraying grid (7) one sides are provided with ammonia entrance.
4. a kind of device for the mixed thermal process of denitration claimed in claim 1, is characterized in that, described burner (4) be arranged on flue gas heat-exchange unit (2) after.
5. a kind of device for the mixed thermal process of denitration claimed in claim 1, is characterized in that, described gas approach (6) and mixed hot charging are put between (3) and be provided with expansion joint.
6. a kind of device for the mixed thermal process of denitration claimed in claim 1, is characterized in that, between described gas approach (6) and SCR reactor (8), is provided with expansion joint.
7. a kind of device for the mixed thermal process of denitration claimed in claim 1, is characterized in that, between described SCR reactor (8) and exhaust pass (10), is provided with expansion joint.
8. a kind of device for the mixed thermal process of denitration claimed in claim 1, is characterized in that, in described SCR reactor (8), is provided with catalyst (9).
9. adopt the out of stock mixed thermal process of low temperature of installing described in claim 1-8 any one, it is characterized in that, comprising:
1) adopt flue gas heat-exchange unit to heat up in advance to inlet flue gas;
2) use burner generation high temperature air and flue gas to mix heat, make flue gas reach 300 ° more than C;
3) adopt flue gas heat-exchange unit to carry out recuperation of heat utilization to outlet flue gas.
10. the out of stock mixed thermal process of low temperature claimed in claim 9, is characterized in that, adopts flue gas heat-exchange unit to be warming up in advance 190-230 ° of C to inlet flue gas in step 1).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610148612.4A CN105597533A (en) | 2016-03-16 | 2016-03-16 | Device for denitration heating blend technology |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610148612.4A CN105597533A (en) | 2016-03-16 | 2016-03-16 | Device for denitration heating blend technology |
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| Publication Number | Publication Date |
|---|---|
| CN105597533A true CN105597533A (en) | 2016-05-25 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610148612.4A Pending CN105597533A (en) | 2016-03-16 | 2016-03-16 | Device for denitration heating blend technology |
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| CN (1) | CN105597533A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106925116A (en) * | 2017-05-19 | 2017-07-07 | 大唐环境产业集团股份有限公司 | Low-temperature smoke air SCR denitrification apparatus |
| CN107126840A (en) * | 2017-07-01 | 2017-09-05 | 成都国化环保科技有限公司 | A kind of flue gas desulfurization and denitrification equipment line |
| CN109173714A (en) * | 2018-10-17 | 2019-01-11 | 浙江德创环保科技股份有限公司 | Low temperature SCR denitration system, device, method |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN203316007U (en) * | 2013-06-28 | 2013-12-04 | 曾永健 | Selective catalytic reduction denitration system for sintering flue gas |
| CN203564950U (en) * | 2013-11-21 | 2014-04-30 | 武汉钢铁(集团)公司 | Sintering flue gas denitrating device |
| CN205613280U (en) * | 2016-03-16 | 2016-10-05 | 江苏峰业科技环保集团股份有限公司 | A device that is used for muddy thermal technology of denitration to plant |
-
2016
- 2016-03-16 CN CN201610148612.4A patent/CN105597533A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN203316007U (en) * | 2013-06-28 | 2013-12-04 | 曾永健 | Selective catalytic reduction denitration system for sintering flue gas |
| CN203564950U (en) * | 2013-11-21 | 2014-04-30 | 武汉钢铁(集团)公司 | Sintering flue gas denitrating device |
| CN205613280U (en) * | 2016-03-16 | 2016-10-05 | 江苏峰业科技环保集团股份有限公司 | A device that is used for muddy thermal technology of denitration to plant |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106925116A (en) * | 2017-05-19 | 2017-07-07 | 大唐环境产业集团股份有限公司 | Low-temperature smoke air SCR denitrification apparatus |
| CN107126840A (en) * | 2017-07-01 | 2017-09-05 | 成都国化环保科技有限公司 | A kind of flue gas desulfurization and denitrification equipment line |
| CN109173714A (en) * | 2018-10-17 | 2019-01-11 | 浙江德创环保科技股份有限公司 | Low temperature SCR denitration system, device, method |
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Application publication date: 20160525 |
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