CN105032183A - Urea solution-based SCR smoke denitration treatment system and method - Google Patents
Urea solution-based SCR smoke denitration treatment system and method Download PDFInfo
- Publication number
- CN105032183A CN105032183A CN201510527140.9A CN201510527140A CN105032183A CN 105032183 A CN105032183 A CN 105032183A CN 201510527140 A CN201510527140 A CN 201510527140A CN 105032183 A CN105032183 A CN 105032183A
- Authority
- CN
- China
- Prior art keywords
- urea
- treatment system
- scr
- flue gas
- reaction
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Abstract
The invention discloses a urea solution-based SCR smoke denitration treatment system and method. The urea solution-based SCR smoke denitration treatment system comprises an SCR reactor and a urea supply distribution unit, wherein the urea supply distribution unit comprises a mixer, and a raw urea liquid tank and a water tank which are connected with a water inlet of the mixer; a water outlet of the mixer is connected with at least two spraying guns which are connected in parallel; the spraying guns extend into a reaction air flue in a flue of a SCR reactor, and the temperature of the reaction air flue is 350-600 DEG C; the positions of the spraying guns and the amount of injected-in urea in the urea supply distribution unit are adjusted according to the concentrations of nitric oxides in smoke in the spraying guns in the SCR reaction. The treatment method comprises the following steps: injecting a urea solution into the reaction air flue in the flue of the SCR reactor, wherein the temperature of the reaction air flue is 350-600 DEG C; performing pyrolytic reaction on urea to generate ammonia gas at the temperature of 350-600 DEG C; and under the action of an SCR catalyst, reducing NOX in the smoke to N2 and H2O. According to the urea solution-based SCR smoke denitration treatment system and method, the accurate control of the use amount of a reducing agent is realized.
Description
Technical field
The present invention relates to a kind of exhaust treatment system and method, be specifically related to a kind of based on being that reducing agent carries out the treatment system of denitrating flue gas process and corresponding processing method with urea.
Background technology
Coal can produce a large amount of oxysulfides, nitrogen oxide, dust and heavy metal in the process of burning.Wherein, a part of pollutant is from the component of fuel self, and most of pollutant then produces in combustion.The generation of these flue gas pollutants will cause great destruction to environment." 12 " period, country strengthens the improvement to coal-burning boiler, makes the discharge of flue gas pollutant obtain control to a certain extent.
SCR (selective catalytic reduction) technology is as applying one of gas denitrifying technology the most widely in industry, and it is under catalyst action, sprays into ammonia or urea as reducing agent, by NO in the flue gas of temperature about 280 ~ 420 DEG C
xbe reduced into N
2and H
2o, processing procedure does not have accessory substance, does not form secondary pollution, has removal efficiency high (can reach more than 90%), reliable, is convenient to the advantages such as maintenance.But, when taking ammonia as reducing agent, because adopted is mostly liquefied ammonia, there is high risk, it stores, transport is all very constant, and there is larger potential safety hazard.When adopting urea to be reducing agent, the security of system can be improved to a certain extent, but preparing ammonia need be carried out by hydrolysis or pyrolytic reaction, and then react in reactor of making a gift to someone, need newly-built pyrolysis oven in this technical process, increase firing equipment etc., improve equipment cost and the operating cost of denitrating flue gas process, and add energy consumption.Therefore, the smoke processing system that a kind of security of system is high, operating cost is low, denitration efficiency is high is urgently developed.
Summary of the invention
The object of the invention is to overcome the deficiencies in the prior art, the SCR denitrating flue gas treatment system based on urea liquid that a kind of security is high, operating cost is low, denitration efficiency is high is provided.In addition, another object of the present invention is to provide the treatment process utilizing this treatment system to carry out denitrating flue gas process.
For achieving the above object, the present invention is by the following technical solutions:
A kind of SCR denitrating flue gas treatment system based on urea liquid, comprise SCR reactor and urea supply allocation units, wherein: described urea supply allocation units comprise blender and the urea original fluid container that is connected with the water inlet of respectively described blender and water pot, the delivery port of described blender is connected with at least two spray guns be arranged in parallel, and described spray gun stretches into, and the flue of SCR reactor is inner, temperature is in the reaction air channel of 350-600 DEG C.
Preferably: in described urea supply unit, the position of each spray gun, the amount of urea liquid that sprays into adjust according to the concentration of the nitrogen oxide in the flue gas within the scope of each lance ejection in SCR reaction.
Preferably: in described urea supply unit, each spray gun equidistantly distributes by the internal perisporium of radial direction along the flue of SCR reactor.
Preferably: described spray gun comprises gun body and is located at the shower nozzle of gun body front end, described gun body inside is provided with an ozonizer passed through for ozone, the end of described ozonizer is connected with shower nozzle and ozone supplied equipment respectively with afterbody, and the inside of described gun body is injected with the dry refrigerating gas around ozonizer.
Preferably: the center of described shower nozzle is provided with a rectangular nozzle, the atomizing particle size of described rectangular nozzle is 100-500 μm.
Preferably: the flow of described spray gun is 50-300kg/h, and pressure is 0.2Mpa-0.6Mpa.
Preferably: described urea supply allocation units also comprise the flow control valve controlling urea original fluid container and water pot water flow respectively, and control the flow control valve of urea liquid flow in each spray gun and realize whole urea supply allocation units automatically running the control unit controlled.
Preferably: described treatment system also comprises oxidation reaction unit, described oxidation reaction unit comprises the oxidation reactor be connected with the air outlet of SCR reactor, passes into the oxidant with flue gas generation oxidation reaction in described oxidation reactor.
Another object of the present invention, a kind ofly utilize described method boiler smoke processed based on the SCR denitrating flue gas treatment system of urea liquid, its treatment step comprises: by spray gun the urea liquid that is 2-20% through the mixed mass concentration of blender sprayed into that the flue of SCR reactor is inner, temperature is in the reaction air channel of 350-600 DEG C, there is pyrolytic reaction at this temperature and generate ammonia in urea, and under the effect of SCR catalyst, by the NO in flue gas
xbe reduced into N
2and H
2o.
Preferably: described treatment step also comprises: the flue gas after SCR reactor denitration process and oxidant generation oxidation reaction, with the nitrogen oxide in further oxidation removal flue gas, sulfur oxide contamination thing.
Beneficial effect of the present invention is, the present invention is inner by flue urea liquid directly being sprayed into SCR reactor, temperature is in the reaction air channel of 350-600 DEG C, make urea can the even premixed with the flue gas in flue while generation pyrolysis, subsequently under catalyst action by the NO in flue gas
xbe reduced into N
2and H
2o is with the object of denitrating flue gas.And, treatment system of the present invention can adjust the straying quatity of reducing agent urea solution in the quantity of spray gun, distributing position and each spray gun according to the difference of nitrogen oxides in effluent concentration in flue, achieve the accurate adjustable control of the urea liquid amount in the reaction zone that divides with lance ejection scope, improve reduction reaction efficiency and significantly reduce the consumption of reducing agent urea solution, reducing processing cost.
Accompanying drawing explanation
Fig. 1 shows the structural representation of denitrating flue gas treatment system of the present invention;
Fig. 2 shows the structural representation of urea supply allocation units of the present invention;
Fig. 3 shows the structural representation of spray gun of the present invention.
Detailed description of the invention
Below in conjunction with accompanying drawing, the specific embodiment of the present invention is described further.
As shown in Figure 1, denitrating flue gas treatment system of the present invention, comprise SCR reactor 1 and urea supply allocation units 2, wherein, as shown in Figure 2, urea supply allocation units 2 of the present invention comprise the urea original fluid container 24 that mass concentration is 40-60% are housed, the water pot 23 of deionized water is housed, blender 22 and at least two spray guns be arranged in parallel 21, the water side of described urea original fluid container 24 and water pot 23 is all connected by the water inlet of pipeline with blender 22, the delivery port of described blender 22 is connected with at least two spray guns be arranged in parallel 21, the flue that described spray gun 21 stretches into SCR reactor 1 is inner, temperature is in the reaction air channel of 350-600 DEG C, sending in the reaction flue of SCR reactor 1 through the mixed urea liquid of blender 22, in the present invention, the position of each spray gun 21, the amount of the urea liquid sprayed into can adjust according to the concentration of the nitrogen oxide in the flue gas in spray regime residing for spray gun 21 each in SCR reactor 1, preferably, each spray gun 21 equidistantly distributes by the internal perisporium of radial direction along the flue of SCR reactor 1.As shown in Figure 3, spray gun 21 of the present invention comprises gun body 211 in a tubular form and is located at the shower nozzle 212 of gun body 211 front end, described gun body 211 inside is provided with an ozonizer 213 passed through for ozone, the end of described ozonizer 213 is connected with shower nozzle 212, and its afterbody is provided with the ozone entrance 214 that can be connected with ozone supplied equipment.In addition, the inside of described gun body 211, the surrounding of ozonizer 213 are also injected with dry refrigerating gas by the cold gas inlet 215 being located at gun body 211 afterbody, and described refrigerating gas can be air, oxygen or nitrogen.Further, shower nozzle 212 of the present invention, the center is provided with a rectangular nozzle (not shown), the atomizing particle size of described rectangular nozzle is 100-500 μm, to guarantee the jet atomization effect that shower nozzle is good, both can not be ejected in flue inner wall, maximum swept area can be ensured again, make the reaction of nitrogen oxides in urea and flue gas more even fully, the flow of described spray gun 21 is 50-300kg/h, and pressure is 0.2Mpa-0.6Mpa.In addition, in the present invention, the material of each parts of described spray gun can adopt stainless steel as 316L or titanium material, and is provided with adpting flange 216 to be fixed on removably in flue reactor by described spray gun at the afterbody of gun body 211.
In addition, urea supply allocation units 2 of the present invention also comprise the flow control valve controlling urea original fluid container 24 and water pot 23 water flow respectively, to control to enter the amount of urea stoste in blender 22 and deionized water respectively, and then guarantee that through the mass concentration of the mixed urea liquid of blender 22 be 2-20%, described urea supply allocation units 2 also comprise the flow control valve controlling urea liquid flow in each spray gun 21 and the PLC control unit realizing automatically running control to whole urea supply allocation units.Further, denitration treatment system of the present invention also can comprise oxidation reaction unit, described oxidation reaction unit comprises the oxidation reactor be connected with the air outlet of SCR reactor 1, oxidant has been passed in described oxidation reactor, the preferred ozone of described oxidant, flue gas after SCR reactor 1 denitration process in oxidation reactor with oxidant generation oxidation reaction, with the pollutant such as nitrogen oxide, oxysulfide in further oxidation removal flue gas.
The present invention's denitration treatment system as above is adopted to process boiler smoke, its treatment step comprises: in urea original fluid container 24, mass concentration is that deionized water in the urea stoste of 40-60% and water pot 23 is mixed into through blender 22 urea liquid that mass concentration is 2-20%, and sprayed into by spray gun 21 that the flue of SCR reactor 1 is inner, temperature is in the reaction air channel of 350-600 DEG C, there is pyrolytic reaction at this temperature and generate ammonia in urea, and under the effect of SCR catalyst, by the NO in flue gas
xbe reduced into N
2and H
2o, and then the object reaching denitrating flue gas.
Further, also can comprise oxidation step in described treatment step: the flue gas after SCR reactor 1 denitration process in oxidation reactor with oxidant as ozone generation oxidation reaction, with the pollutant such as nitrogen oxide, oxysulfide in further oxidation removal flue gas.
The present invention is inner by the flue urea liquid of reducing agent 2-20% being sprayed into SCR reactor 1, temperature is in the reaction air channel of 350-600 DEG C, make urea can the even premixed with the flue gas in flue while generation pyrolysis, subsequently under catalyst action by the NO in flue gas
xbe reduced into N
2and H
2o is with the object of denitrating flue gas, and denitration efficiency is high.
The present invention is by preferred embodiment having carried out detailed explanation.But, by studying carefully above, to the change of each embodiment with to increase also be that one of ordinary skill in the art institute is apparent.Being intended that all these changes and increasing of applicant has dropped in the protection domain of the claims in the present invention.Similar numbering refers to similar element in the whole text.For clarity, the situation of some line, layer, element, parts or feature being amplified may be had in the accompanying drawings.
Term used herein is only and is illustrated specific embodiment, and is not intended to limit the invention.Unless otherwise defined, all terms used herein (comprising technical term and scientific terminology) are all identical with the understanding of one of ordinary skill in the art of the present invention.Also must it is clear that, except having clear and definite definition in this article, in such as dictionary, the term of usually definition should be interpreted as can having the consistent meaning in the linguistic context of this description and correlation technique, and the idealized or undue formalization should do not explained.Known function or structure are in briefly and clearly consider or repeat no more.
Claims (10)
1. the SCR denitrating flue gas treatment system based on urea liquid, comprise SCR reactor and urea supply allocation units, it is characterized in that: described urea supply allocation units comprise blender and the urea original fluid container that is connected with the water inlet of respectively described blender and water pot, the delivery port of described blender is connected with at least two spray guns be arranged in parallel, and described spray gun stretches into, and the flue of SCR reactor is inner, temperature is in the reaction air channel of 350-600 DEG C.
2. treatment system according to claim 1, is characterized in that: in described urea supply unit, the position of each spray gun, the amount of urea liquid that sprays into adjust according to the concentration of the nitrogen oxide in the flue gas within the scope of each lance ejection in SCR reaction.
3. treatment system according to claim 2, is characterized in that: in described urea supply unit, each spray gun equidistantly distributes by the internal perisporium of radial direction along the flue of SCR reactor.
4. treatment system according to claim 1 and 2, it is characterized in that: described spray gun comprises gun body and is located at the shower nozzle of gun body front end, described gun body inside is provided with an ozonizer passed through for ozone, the end of described ozonizer is connected with shower nozzle and ozone supplied equipment respectively with afterbody, and the inside of described gun body is injected with the dry refrigerating gas around ozonizer.
5. treatment system according to claim 4, is characterized in that: the center of described shower nozzle is provided with a rectangular nozzle, and the atomizing particle size of described rectangular nozzle is 100-500 μm.
6. treatment system according to claim 4, is characterized in that: the flow of described spray gun is 50-300kg/h, and pressure is 0.2Mpa-0.6Mpa.
7. according to the treatment system in claim 1-3 described in any one, it is characterized in that: described urea supply allocation units also comprise the flow control valve controlling urea original fluid container and water pot water flow respectively, and control the flow control valve of urea liquid flow in each spray gun and realize whole urea supply allocation units automatically running the control unit controlled.
8. according to the treatment system in claim 1-3 described in any one, it is characterized in that: described treatment system also comprises oxidation reaction unit, described oxidation reaction unit comprises the oxidation reactor be connected with the air outlet of SCR reactor, passes into the oxidant with flue gas generation oxidation reaction in described oxidation reactor.
9. one kind utilizes as claimed in claim 1 or 2 based on the method that the SCR denitrating flue gas treatment system of urea liquid processes boiler smoke, it is characterized in that: its treatment step comprises: by spray gun the urea liquid that is 2-20% through the mixed mass concentration of blender sprayed into that the flue of SCR reactor is inner, temperature is in the reaction air channel of 350-600 DEG C, there is pyrolytic reaction at this temperature and generate ammonia in urea, and under the effect of SCR catalyst, by the NO in flue gas
xbe reduced into N
2and H
2o.
10. method according to claim 9, is characterized in that: described treatment step also comprises: the flue gas after SCR reactor denitration process and oxidant generation oxidation reaction, with the nitrogen oxide in further oxidation removal flue gas, sulfur oxide contamination thing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510527140.9A CN105032183A (en) | 2015-08-25 | 2015-08-25 | Urea solution-based SCR smoke denitration treatment system and method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510527140.9A CN105032183A (en) | 2015-08-25 | 2015-08-25 | Urea solution-based SCR smoke denitration treatment system and method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN105032183A true CN105032183A (en) | 2015-11-11 |
Family
ID=54439507
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510527140.9A Pending CN105032183A (en) | 2015-08-25 | 2015-08-25 | Urea solution-based SCR smoke denitration treatment system and method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN105032183A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111957202A (en) * | 2020-08-21 | 2020-11-20 | 浙江浙能技术研究院有限公司 | Denitration system suitable for biomass boiler |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102210974A (en) * | 2010-04-09 | 2011-10-12 | 同方环境股份有限公司 | Selective catalytic reduction device by directly spraying urea solution and method thereof |
| CN104841256A (en) * | 2015-05-27 | 2015-08-19 | 北京宜泽环保科技有限责任公司 | Zero discharge system for treating flue gas of boiler and method |
| CN204865548U (en) * | 2015-08-25 | 2015-12-16 | 北京宜泽环保科技有限责任公司 | SCR flue gas denitration processing system based on urea solution |
-
2015
- 2015-08-25 CN CN201510527140.9A patent/CN105032183A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102210974A (en) * | 2010-04-09 | 2011-10-12 | 同方环境股份有限公司 | Selective catalytic reduction device by directly spraying urea solution and method thereof |
| CN104841256A (en) * | 2015-05-27 | 2015-08-19 | 北京宜泽环保科技有限责任公司 | Zero discharge system for treating flue gas of boiler and method |
| CN204865548U (en) * | 2015-08-25 | 2015-12-16 | 北京宜泽环保科技有限责任公司 | SCR flue gas denitration processing system based on urea solution |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111957202A (en) * | 2020-08-21 | 2020-11-20 | 浙江浙能技术研究院有限公司 | Denitration system suitable for biomass boiler |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US20130152470A1 (en) | Injector and method for reducing nox emissions from boilers, ic engines and combustion processes | |
| CN102085452A (en) | Reducing agent atomization spray gun for selective non-catalytic reduction denitration process | |
| CN202823144U (en) | Spray gun used for selective non-catalytic reduction (SNCR) and SNCR-selective catalytic reduction (SCR) denitration | |
| CN107261837A (en) | It is a kind of to quote denitrification apparatus and technique that high-temperature flue gas carries out urea pyrolysis ammonia | |
| CN104587830A (en) | Urea solution intra-flue direct injection pyrolysis device and method with SCR (Selective Catalytic Reduction) system | |
| JP6338323B2 (en) | Denitration equipment | |
| CN106422772A (en) | Ammonia-water gasification system for SCR flue gas denitration | |
| CN203342646U (en) | Fluidized bed boiler flue gas denitrating device adopting urea hydrolysis SNCR (selective non-catalytic reduction) | |
| CN203886401U (en) | Boiler flue gas denitration system adopting SCR process | |
| CN205386412U (en) | Boiler flue gas denitration system | |
| CN204933244U (en) | NOx removal device in coal-burning power plant's coal-powder boiler flue gas | |
| CN108295652B (en) | Integrated process and system for flue gas desulfurization and denitration waste heat utilization of carbon rotary kiln | |
| CN206965521U (en) | A kind of denitrification apparatus quoted high-temperature flue gas and carry out urea pyrolysis ammonia | |
| CN104841256A (en) | Zero discharge system for treating flue gas of boiler and method | |
| CN204865548U (en) | SCR flue gas denitration processing system based on urea solution | |
| CN104785092A (en) | An SNCR flue gas denitration device | |
| CN105032183A (en) | Urea solution-based SCR smoke denitration treatment system and method | |
| CN203389534U (en) | Selective catalytic reduction (SCR) flue gas denitrification device | |
| CN207680333U (en) | Urea direct-injection SNCR+SCR flue gas denitrification systems | |
| CN205461737U (en) | Non - catalytic reduction method deNOx systems of two reductant selectivity | |
| CN204429102U (en) | A kind of utilization in the urea liquid flue of SCR system directly sprays pyrolysis installation | |
| CN103301737A (en) | Urea hydrolyzed SNCR (selective non-catalytic reduction) flue gas denitrification device for fluidized bed boiler | |
| CN103691291A (en) | Process for carrying out denitration on incineration flue gas generated by printing and dyeing sludge | |
| CN209020180U (en) | A kind of carbon black tail gas furnace denitrification apparatus | |
| CN113083004A (en) | Be applicable to well low temperature SCR denitration aqueous ammonia direct injection device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| WD01 | Invention patent application deemed withdrawn after publication | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20151111 |