CN105498521A - SNCR denitrification device capable of directly feeding urea granules for CFB boiler - Google Patents
SNCR denitrification device capable of directly feeding urea granules for CFB boiler Download PDFInfo
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- CN105498521A CN105498521A CN201610019630.2A CN201610019630A CN105498521A CN 105498521 A CN105498521 A CN 105498521A CN 201610019630 A CN201610019630 A CN 201610019630A CN 105498521 A CN105498521 A CN 105498521A
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- urea granules
- cfb boiler
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- urea
- boiler
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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
- B01D53/81—Solid phase processes
- B01D53/83—Solid phase processes with moving reactants
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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
- B01D53/54—Nitrogen compounds
- B01D53/56—Nitrogen oxides
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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
- B01D2251/2067—Urea
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2257/00—Components to be removed
- B01D2257/40—Nitrogen compounds
- B01D2257/402—Dinitrogen oxide
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2257/00—Components to be removed
- B01D2257/40—Nitrogen compounds
- B01D2257/404—Nitrogen oxides other than dinitrogen oxide
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2259/00—Type of treatment
- B01D2259/12—Methods and means for introducing reactants
- B01D2259/128—Solid reactants
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02C—CAPTURE, STORAGE, SEQUESTRATION OR DISPOSAL OF GREENHOUSE GASES [GHG]
- Y02C20/00—Capture or disposal of greenhouse gases
- Y02C20/10—Capture or disposal of greenhouse gases of nitrous oxide (N2O)
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Environmental & Geological Engineering (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)
Abstract
The invention discloses an SNCR denitrification device capable of directly feeding urea granules for a CFB boiler. The SNCR denitrification device comprises a material warehouse, a feeding blower and a furnace which are communicated through pipelines, a mixer is communicated to the pipeline arranged between the feeding blower and the material warehouse, a branch pipe is communicated to a pipeline arranged between the mixer and the feeding blower, and an inlet of the branch pipe is communicated with a urea granule warehouse. The SNCR denitrification device has the following advantage that efficient and low-cost flue gas denitrification of the CFB boiler is achieved through the characteristic that the furnace temperature of the CFB boiler is kept at 850 DEG C-1050 DEG C.
Description
Technical field
The invention belongs to gas denitrifying technology field, particularly a kind ofly directly add urea granules SNCR denitration device for CFB boiler.
Background technology
In denitrating flue gas field, SCR (SCR) and non-selective catalytic reduction (SNCR) two kinds of methods are widely applied.At present, adopt urea as in the technique of denitrification reducing agent, no matter be SNCR technology or SCR technology, all need urea granules to be first converted into urea liquid.
Especially for urea SNCR denitration technique, be generally that the urea liquid of solubility about 10% is sprayed into cyclone inlet.There is following shortcoming in this technique:
1, dilute urea solution sprays into boiler, and the moisture content quantity of bringing into is very large.A large amount of water evaporates intensification in flue can reduce flue-gas temperature, thus reduces boiler heat exchange effect and boiler efficiency;
2, when CFB boiler at low load operating mode, the temperature of cyclone inlet can be lower, lower than the optimal reaction temperature of SNCR, is unfavorable for the carrying out of denitration reaction;
3, the urea liquid sprayed into can not with flue gas Homogeneous phase mixing;
4, urea granules is made urea liquid, need the process equipment of a set of more complicated.
CFB boiler hearth temperature generally maintains 850 ~ 1000 DEG C, and this temperature range is just in time in the temperature range of NH3 denitration efficiency the best.If one can be developed utilize the original body construction of boiler, urea granules is directly comparatively evenly sent into burner hearth, realizes the device of denitration function as reducing agent, will effectively reduce denitration cost, advance CFB denitration of boiler smoke engineer applied.
Summary of the invention
Technical problem to be solved by this invention is, provides a kind of and directly adds urea granules SNCR denitration device for CFB boiler, utilize CFB boiler hearth temperature to maintain the feature of 850 ~ 1050 DEG C, realize the denitrating flue gas of CFB high efficiency boiler low cost.
For solving the problems of the technologies described above, provided by the inventionly directly add urea granules SNCR denitration device for CFB boiler, it comprises material bin, feeding fan and burner hearth, pipeline communication is passed through between described material bin, feeding fan, burner hearth, pipeline between described feeding fan and material bin is communicated with blender, pipeline between described blender and feeding fan is communicated with arm, and the entrance of described arm is communicated with urea granules storehouse.In former boiler material feeding system, be incorporated to urea granules feeding system, utilize blower fan material and urea granules mixture to be sowed comparatively uniformly and enter boiler furnace, realize denitrating flue gas.
As preferably, described arm is provided with urea discharge valve group, and the pipeline between branch outlet end and the material bin port of export is provided with material discharge valve group.Control the quantity delivered of urea granules and material respectively.
After adopting above structure, of the present inventionly directly add urea granules SNCR denitration device compared with prior art for CFB boiler, have the following advantages:
1, system is simple, and cost drops into low, only needs to increase a set of urea granules storehouse and urea discharge valve group, and design technology simplifies, and number of devices reduces, and investment reduces;
2, system cloud gray model expense is low, little on boiler efficiency impact, does not need to add water, and power consumption is also little, and operating cost is very low, simultaneously owing to realizing anhydrous SNCR denitration, does not need to consider that moisture evaporates the problem heating up and cause boiler efficiency to reduce;
3, CFB boiler at low load denitration operating mode is applicable to, when CFB boiler at low load, cyclone inlet cigarette temperature can be down to less than 850 DEG C, even lower, be not suitable for cyclone inlet spray urea liquid to realize SNCR denitration, but because underload fire box temperature is more than 850 DEG C, on denitration of the present invention without impact;
4, good mixing effect, owing to can be pre-mixed with material, just can realize good mixed effect in burner hearth.
Accompanying drawing explanation
Fig. 1 is structural representation of the present invention.
Wherein: 1, material bin, 2, feeding fan, 3, burner hearth, 4, blender, 5, arm, 6, urea granules storehouse, 7, urea discharge valve group, 8, material discharge valve group.
Detailed description of the invention
Below by embodiment, the invention will be further described by reference to the accompanying drawings.
As shown in Figure 1, what the present embodiment provided directly adds urea granules SNCR denitration device for CFB boiler, it comprises material bin 1, feeding fan 2 and burner hearth 3, described material bin 1, feeding fan 2, pipeline communication is passed through between burner hearth 3, pipeline between described feeding fan 2 and material bin 1 is communicated with blender 4, pipeline between described blender 4 and feeding fan 2 is communicated with arm 5, the entrance of described arm 5 is communicated with urea granules storehouse 6, described arm 5 is provided with urea discharge valve group 7, pipeline between arm 6 port of export and material bin 1 port of export is provided with material discharge valve group 8.
Material can be coal dust, lime stone or other add the mixture of CFB boiler.
When SNCR equipment runs, first urea granules is joined in urea granules storehouse 6, then according to boiler practical operation situation, urea granules is added by calculating gained speed, after urea granules and mixing of materials, together by feeding fan send into CFB boiler furnace you, react in burner hearth generation SNCR denitration.
Claims (2)
1. one kind directly adds urea granules SNCR denitration device for CFB boiler, it comprises material bin, feeding fan and burner hearth, pipeline communication is passed through between described material bin, feeding fan, burner hearth, it is characterized in that: the pipeline between described feeding fan and material bin is communicated with blender, pipeline between described blender and feeding fan is communicated with arm, and the entrance of described arm is communicated with urea granules storehouse.
2. according to claim 1ly directly add urea granules SNCR denitration device for CFB boiler, it is characterized in that: described arm is provided with urea discharge valve group, the pipeline between branch outlet end and the material bin port of export is provided with material discharge valve group.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610019630.2A CN105498521A (en) | 2016-01-13 | 2016-01-13 | SNCR denitrification device capable of directly feeding urea granules for CFB boiler |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610019630.2A CN105498521A (en) | 2016-01-13 | 2016-01-13 | SNCR denitrification device capable of directly feeding urea granules for CFB boiler |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN105498521A true CN105498521A (en) | 2016-04-20 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610019630.2A Pending CN105498521A (en) | 2016-01-13 | 2016-01-13 | SNCR denitrification device capable of directly feeding urea granules for CFB boiler |
Country Status (1)
| Country | Link |
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| CN (1) | CN105498521A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110201528A (en) * | 2019-07-05 | 2019-09-06 | 焦作市君威机械有限公司 | The dry urea denitration in the stove equipment of circulating fluidized bed boiler |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20090025658A1 (en) * | 2007-07-27 | 2009-01-29 | Mikhail Maryamchik | Black plant steam furnace injection |
| CN202962265U (en) * | 2012-12-10 | 2013-06-05 | 徐州燃控科技股份有限公司 | Dry-process-based selective non-catalytic reduction device |
| CN203829912U (en) * | 2014-05-15 | 2014-09-17 | 北京洛卡环保技术有限公司 | Flue gas denitration system of CFB furnace |
| CN203829911U (en) * | 2014-05-15 | 2014-09-17 | 北京洛卡环保技术有限公司 | SNCR (selective non-catalytic reduction) denitration system of circulating fluidized bed boiler |
| CN205269396U (en) * | 2016-01-13 | 2016-06-01 | 杭州锅炉集团股份有限公司 | Directly add urea granule SNCR denitrification facility to CFB boiler |
-
2016
- 2016-01-13 CN CN201610019630.2A patent/CN105498521A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20090025658A1 (en) * | 2007-07-27 | 2009-01-29 | Mikhail Maryamchik | Black plant steam furnace injection |
| CN202962265U (en) * | 2012-12-10 | 2013-06-05 | 徐州燃控科技股份有限公司 | Dry-process-based selective non-catalytic reduction device |
| CN203829912U (en) * | 2014-05-15 | 2014-09-17 | 北京洛卡环保技术有限公司 | Flue gas denitration system of CFB furnace |
| CN203829911U (en) * | 2014-05-15 | 2014-09-17 | 北京洛卡环保技术有限公司 | SNCR (selective non-catalytic reduction) denitration system of circulating fluidized bed boiler |
| CN205269396U (en) * | 2016-01-13 | 2016-06-01 | 杭州锅炉集团股份有限公司 | Directly add urea granule SNCR denitrification facility to CFB boiler |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110201528A (en) * | 2019-07-05 | 2019-09-06 | 焦作市君威机械有限公司 | The dry urea denitration in the stove equipment of circulating fluidized bed boiler |
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