CN110201528A - The dry urea denitration in the stove equipment of circulating fluidized bed boiler - Google Patents
The dry urea denitration in the stove equipment of circulating fluidized bed boiler Download PDFInfo
- Publication number
- CN110201528A CN110201528A CN201910604852.4A CN201910604852A CN110201528A CN 110201528 A CN110201528 A CN 110201528A CN 201910604852 A CN201910604852 A CN 201910604852A CN 110201528 A CN110201528 A CN 110201528A
- Authority
- CN
- China
- Prior art keywords
- urea
- boiler
- fluidized bed
- circulating fluidized
- denitration
- 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
- XSQUKJJJFZCRTK-UHFFFAOYSA-N Urea Chemical compound NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 title claims abstract description 89
- 239000004202 carbamide Substances 0.000 title claims abstract description 89
- 238000002156 mixing Methods 0.000 claims abstract description 24
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 5
- 239000000109 continuous material Substances 0.000 claims description 3
- 239000000463 material Substances 0.000 claims description 3
- 239000002184 metal Substances 0.000 claims description 3
- 229910052751 metal Inorganic materials 0.000 claims description 3
- 239000003638 chemical reducing agent Substances 0.000 abstract description 6
- 238000010438 heat treatment Methods 0.000 abstract description 6
- 238000000034 method Methods 0.000 abstract description 6
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 6
- 229910021529 ammonia Inorganic materials 0.000 description 3
- 239000003245 coal Substances 0.000 description 3
- 239000007864 aqueous solution Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 239000003795 chemical substances by application Substances 0.000 description 2
- 238000002485 combustion reaction Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000002425 crystallisation Methods 0.000 description 1
- 230000008025 crystallization Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000004090 dissolution Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000003546 flue gas Substances 0.000 description 1
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 1
- 239000010931 gold Substances 0.000 description 1
- 229910052737 gold Inorganic materials 0.000 description 1
- 231100001261 hazardous Toxicity 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 230000003134 recirculating effect Effects 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 210000002700 urine Anatomy 0.000 description 1
Classifications
-
- 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
- B01D53/565—Nitrogen oxides by treating the gases with solids
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Health & Medical Sciences (AREA)
- Biomedical Technology (AREA)
- Environmental & Geological Engineering (AREA)
- Analytical Chemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Treating Waste Gases (AREA)
Abstract
The invention discloses a kind of dry urea denitration in the stove equipment of circulating fluidized bed boiler, the urea conveying device including boiler and for directly transporting urea into boiler, and the urea conveyed into boiler is the dry urea dissolved without water；The urea conveying device include urea feed bin, the flow mixing device being set to below urea feed bin and for into flow mixing device provide be used for urea mobilization dynamic blower, the discharge port of urea feed bin and the feed inlet of flow mixing device connect, the air outlet of blower is connected by the air inlet of pipeline and flow mixing device, and the discharge port of flow mixing device is connect by pipeline with boiler.The dry urea denitration in the stove equipment of circulating fluidized bed boiler of the invention, directlys adopt dry urea as reducing agent and carries out denitration, and the relevant device for dissolving and heating without urea reduces the equipment investment and operating cost of denitrification process.
Description
Technical field
The present invention relates to denitration technology field, in particular to a kind of dry urea denitration in the stove equipment of circulating fluidized bed boiler.
Background technique
To prevent from generating excessive NO in boiler after coal combustionxEnvironment is polluted, denitration process should be carried out to coal.Denitration technology
Including two classes: one kind is that denitration is carried out from source, controls in combustion process and generates NOx；Another kind of is from end treatment, control
The NO discharged in flue gasx.Mainly reducing agent is used to restore NO from end treatmentxGenerate non-hazardous N2, reducing agent generally uses
Urea or liquefied ammonia, since liquefied ammonia obtains risk, so often using urea in reality.Urea conduct is used in the prior art
The technology of reducing agent denitration needs first to be dissolved in water urea, with aqueous solution of urea as denitrfying agent.Due to aqueous solution of urea
In urea can generate crystallization in storing process, therefore it is current using urea as in the denitrification apparatus of denitrfying agent, be equipped with
More heating equipment can be put into production at any time with the urea liquid for guaranteeing made, and due to using more
Heating equipment keeps equipment investment and operating cost higher.
Therefore, it is necessary to improve to solve the above technical problems the prior art.
Summary of the invention
In view of this, the purpose of the present invention is to provide a kind of dry urea denitration in the stove equipment of circulating fluidized bed boiler, directly
It connects using dry urea as reducing agent progress denitration, the relevant device for dissolving and heating without urea reduces setting for denitrification process
Standby investment and operating cost.It is realized in particular by following technical scheme:
The dry urea denitration in the stove equipment of circulating fluidized bed boiler of the invention, including boiler and for into boiler directly it is defeated
The urea conveying device of urea is sent, the urea conveyed into boiler is the dry urea dissolved without water；
The urea conveying device includes urea feed bin, the flow mixing device being set to below urea feed bin and is used for flow mixing device
Middle to provide the blower for being used for urea mobilization dynamic, the discharge port of urea feed bin and the feed inlet of flow mixing device connect, the outlet air of blower
Mouth is connected by the air inlet of pipeline and flow mixing device, and the discharge port of flow mixing device is connect by pipeline with boiler.
Further, it is connected between the urea feed bin and blender by constant feeder.
Further, gate valve is provided on the discharge port of the urea.
Further, level-sensing device is provided in the urea feed bin.
Further, the level-sensing device includes high charge level meter and continuous material level meter.
Further, described includes two blowers in parallel, is both provided with switch valve on the parallel pipeline of each blower.
Further, setting gauge is provided in the urea feed bin.
Further, subtube is arranged in the pipeline for connecting the flow mixing device and the boiler at boiler, and subtube passes through gold
Belong to compensation hose.
Further, the boiler is circulating fluidized bed boiler.
Beneficial effects of the present invention: the dry urea denitration in the stove equipment of circulating fluidized bed boiler of the invention directlys adopt dry
Urea carries out denitration as reducing agent, and the relevant device for dissolving and heating without urea reduces the equipment investment of denitrification process
And operating cost；Other beneficial effects of the invention will be further detailed in conjunction with embodiment in detail below.
Detailed description of the invention
The invention will be further described with reference to the accompanying drawings and examples:
Fig. 1 is the structural diagram of the present invention；
Specific embodiment
It is as shown in the figure: the dry urea denitration in the stove equipment of circulating fluidized bed boiler in the present embodiment, including boiler 43 and use
In the urea conveying device for directly transporting urea into boiler 43, the urea conveyed into boiler is the dry urine dissolved without water
Element；
The urea conveying device include urea feed bin 10, the flow mixing device 31 for being set to the lower section of urea feed bin 10 and for
The blower for being used for urea mobilization dynamic is provided in flow mixing device 31, the discharge port 17 of urea feed bin 10 and the feed inlet of flow mixing device 31 connect
Connect, the air outlet of blower connect by pipeline 23 with the air inlet of flow mixing device 31, the discharge port of flow mixing device 31 pass through pipeline 32 and
The high temperature section of boiler 43 connects.Ladder is provided with outside urea feed bin 10.Feed bin feed inlet 16, this reality are provided on urea feed bin 10
The internal diameter for applying the urea feed bin 10 in example is 6000mm, volume 100m3, the nominal diameter of pipeline 23 and pipeline 32 is 25mm,
Certain relevant parameter is one embodiment, and other parameters can be run can also.Dry urea is directly sent into boiler by blower
High temperature section carry out denitration, without urea dissolution and heating equipment, to save corresponding equipment purchase cost and running cost
With reducing denitration cost.
In the present embodiment, connected between the urea feed bin 10 and blender 31 by constant feeder 15.To adjust
Feeding coal.
In the present embodiment, gate valve 14 is provided on the discharge port of the urea feed bin 10.During boiler shutdown, close
Gate valve can enter flow mixing device to avoid urea.Being had using gate valve should not be blocked, advantage convenient for safeguarding.
In the present embodiment, level-sensing device is provided in the urea feed bin 10.Material position in urea silo is observed by level-sensing device,
Raw material is replenished in time.
In the present embodiment, the level-sensing device includes high charge level meter 11 and continuous material level meter 12.
In the present embodiment, the blower includes two blower 21a and 21b in parallel, is all set on the parallel pipeline of blower 21a
It is equipped with switch valve 22a, switch valve 22b is both provided on the parallel pipeline of blower 21b.A blower is only run when use,
The blower not run is as standby fan；If the blower of operation goes wrong, corresponding switch valve is closed, another is opened
The problem of switch valve runs another blower, will not be because of blower influences production.
In the present embodiment, setting gauge 18 is provided in the urea feed bin 10.The occurrence of can preventing fluffy material.
In the present embodiment, subtube is arranged in the pipeline for connecting the flow mixing device 31 and the boiler 43 at boiler, is in charge of
Road compensates the high temperature section that hose 41 connects boiler 43 by metal.Since subtube is high close to the portion temperature of boiler, and it is separate
The portion temperature of boiler is low, expands with heat and contract with cold using caused by metal compensation hose reply temperature difference.It is in charge of to be additionally provided with and is in charge of
Switch valve 42, pipeline 32 can connect multiple boilers simultaneously and carry out denitration, adjust corresponding boiler urea by being in charge of switch valve
Whether connect.
In the present embodiment, the boiler 43 is circulating fluidized bed boiler.Recirculating fluidized bed urea decompose generate ammonia with
NOxContact is more abundant, and denitration effect is more preferably.
Finally, it is stated that the above examples are only used to illustrate the technical scheme of the present invention and are not limiting, although referring to compared with
Good embodiment describes the invention in detail, those skilled in the art should understand that, it can be to skill of the invention
Art scheme is modified or replaced equivalently, and without departing from the objective and range of technical solution of the present invention, should all be covered at this
In the scope of the claims of invention.
Claims (9)
1. a kind of dry urea denitration in the stove equipment of circulating fluidized bed boiler, it is characterised in that: including boiler and for into boiler
The urea conveying device of urea is directly transported, the urea conveyed into boiler is the dry urea dissolved without water；
The urea conveying device includes urea feed bin, the flow mixing device being set to below urea feed bin and for mentioning into flow mixing device
For the blower for urea mobilization dynamic, the discharge port of urea feed bin and the feed inlet of flow mixing device are connected, and the air outlet of blower is logical
The discharge port of the connection of the air inlet of piping and flow mixing device, flow mixing device is connect by pipeline with boiler.
2. the dry urea denitration in the stove equipment of circulating fluidized bed boiler according to claim 1, it is characterised in that: the urea
It is connected between feed bin and blender by constant feeder.
3. the dry urea denitration in the stove equipment of circulating fluidized bed boiler according to claim 2, it is characterised in that: the urea
Gate valve is provided on the discharge port of feed bin.
4. the dry urea denitration in the stove equipment of circulating fluidized bed boiler according to claim 1, it is characterised in that: the urea
Level-sensing device is provided in feed bin.
5. the dry urea denitration in the stove equipment of circulating fluidized bed boiler according to claim 4, it is characterised in that: the material position
Meter includes high charge level meter and continuous material level meter.
6. the dry urea denitration in the stove equipment of circulating fluidized bed boiler according to claim 1, it is characterised in that: the blower
Including two blowers in parallel, switch valve is both provided on the parallel pipeline of each blower.
7. the dry urea denitration in the stove equipment of circulating fluidized bed boiler according to claim 1, it is characterised in that: the urea
Setting gauge is provided in feed bin.
8. the dry urea denitration in the stove equipment of circulating fluidized bed boiler according to claim 7, it is characterised in that: described in connection
Subtube is arranged in the pipeline of flow mixing device and the boiler at boiler, and subtube compensates hose by metal and connects boiler.
9. the dry urea denitration in the stove equipment of circulating fluidized bed boiler described in -8 any claims according to claim 1, special
Sign is: the boiler is circulating fluidized bed boiler.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910604852.4A CN110201528A (en) | 2019-07-05 | 2019-07-05 | The dry urea denitration in the stove equipment of circulating fluidized bed boiler |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910604852.4A CN110201528A (en) | 2019-07-05 | 2019-07-05 | The dry urea denitration in the stove equipment of circulating fluidized bed boiler |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN110201528A true CN110201528A (en) | 2019-09-06 |
Family
ID=67796479
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910604852.4A Pending CN110201528A (en) | 2019-07-05 | 2019-07-05 | The dry urea denitration in the stove equipment of circulating fluidized bed boiler |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110201528A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113266839A (en) * | 2021-06-02 | 2021-08-17 | 秦皇岛新特科技有限公司 | Denitration treatment method for sintering flue gas |
Citations (6)
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|---|---|---|---|---|
| FR2900062A1 (en) * | 2006-04-19 | 2007-10-26 | Tredi Sa | Selectively reducing nitrogen oxides in incinerator flue gases, by injecting solid reducing agent, preferably urea, into several points in post-combustion zone |
| CN105498521A (en) * | 2016-01-13 | 2016-04-20 | 杭州锅炉集团股份有限公司 | SNCR denitrification device capable of directly feeding urea granules for CFB boiler |
| CN105771645A (en) * | 2016-04-28 | 2016-07-20 | 昌邑大伟环保科技有限公司 | Coal burning boiler polymer dry-process denitrifying agent, preparation method thereof and denitrifying process |
| CN106039981A (en) * | 2016-07-20 | 2016-10-26 | 山东神华山大能源环境有限公司 | In-boiler desulfurization and denitration system and method for chain grate boiler |
| CN205730853U (en) * | 2016-07-08 | 2016-11-30 | 安徽电气工程职业技术学院 | Denitrating system in circulating fluid bed boiler |
| CN210645865U (en) * | 2019-07-05 | 2020-06-02 | 焦作市君威机械有限公司 | Denitration system in boiler urea stove |
-
2019
- 2019-07-05 CN CN201910604852.4A patent/CN110201528A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2900062A1 (en) * | 2006-04-19 | 2007-10-26 | Tredi Sa | Selectively reducing nitrogen oxides in incinerator flue gases, by injecting solid reducing agent, preferably urea, into several points in post-combustion zone |
| CN105498521A (en) * | 2016-01-13 | 2016-04-20 | 杭州锅炉集团股份有限公司 | SNCR denitrification device capable of directly feeding urea granules for CFB boiler |
| CN105771645A (en) * | 2016-04-28 | 2016-07-20 | 昌邑大伟环保科技有限公司 | Coal burning boiler polymer dry-process denitrifying agent, preparation method thereof and denitrifying process |
| CN205730853U (en) * | 2016-07-08 | 2016-11-30 | 安徽电气工程职业技术学院 | Denitrating system in circulating fluid bed boiler |
| CN106039981A (en) * | 2016-07-20 | 2016-10-26 | 山东神华山大能源环境有限公司 | In-boiler desulfurization and denitration system and method for chain grate boiler |
| CN210645865U (en) * | 2019-07-05 | 2020-06-02 | 焦作市君威机械有限公司 | Denitration system in boiler urea stove |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113266839A (en) * | 2021-06-02 | 2021-08-17 | 秦皇岛新特科技有限公司 | Denitration treatment method for sintering flue gas |
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