CN215196260U - Urea direct injection SNCR and SCR combined denitration process device - Google Patents
Urea direct injection SNCR and SCR combined denitration process device Download PDFInfo
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- CN215196260U CN215196260U CN202023141159.5U CN202023141159U CN215196260U CN 215196260 U CN215196260 U CN 215196260U CN 202023141159 U CN202023141159 U CN 202023141159U CN 215196260 U CN215196260 U CN 215196260U
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- liquid catalyst
- urea
- urea solution
- denitration
- scr
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- XSQUKJJJFZCRTK-UHFFFAOYSA-N Urea Chemical compound NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 title claims abstract description 33
- 239000004202 carbamide Substances 0.000 title claims abstract description 33
- 238000000034 method Methods 0.000 title claims abstract description 16
- 238000002347 injection Methods 0.000 title claims description 6
- 239000007924 injection Substances 0.000 title claims description 6
- 239000003054 catalyst Substances 0.000 claims abstract description 29
- 239000007788 liquid Substances 0.000 claims abstract description 25
- 239000000243 solution Substances 0.000 claims abstract description 24
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 6
- 239000012895 dilution Substances 0.000 claims abstract description 5
- 238000010790 dilution Methods 0.000 claims abstract description 5
- 239000012530 fluid Substances 0.000 claims description 2
- 239000011259 mixed solution Substances 0.000 claims description 2
- 238000005516 engineering process Methods 0.000 description 11
- 238000006243 chemical reaction Methods 0.000 description 6
- MWUXSHHQAYIFBG-UHFFFAOYSA-N nitrogen oxide Inorganic materials O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 6
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 4
- 239000003638 chemical reducing agent Substances 0.000 description 4
- 239000003546 flue gas Substances 0.000 description 4
- 238000010531 catalytic reduction reaction Methods 0.000 description 3
- 230000007547 defect Effects 0.000 description 3
- 230000007613 environmental effect Effects 0.000 description 2
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 1
- VHUUQVKOLVNVRT-UHFFFAOYSA-N Ammonium hydroxide Chemical compound [NH4+].[OH-] VHUUQVKOLVNVRT-UHFFFAOYSA-N 0.000 description 1
- CBENFWSGALASAD-UHFFFAOYSA-N Ozone Chemical compound [O-][O+]=O CBENFWSGALASAD-UHFFFAOYSA-N 0.000 description 1
- 238000003915 air pollution Methods 0.000 description 1
- 235000011114 ammonium hydroxide Nutrition 0.000 description 1
- 239000003245 coal Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 238000000197 pyrolysis Methods 0.000 description 1
- 238000006722 reduction reaction Methods 0.000 description 1
- 238000005245 sintering Methods 0.000 description 1
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Abstract
The utility model provides a urea is directly spouted SNCR and SCR and is united denitration process units, urea solution, liquid catalyst, dilution water get into through the pipeline and carry to urea solution and liquid catalyst mixing sprayer respectively after metering distribution module mixes, urea solution and liquid catalyst mixing sprayer set up respectively in boiler furnace and boiler turn to indoorly. The method has the advantages of simple process system, space saving, low investment and the like, and has wide popularization and application prospect.
Description
Technical Field
The utility model belongs to the technical field of industry flue gas denitration is administered in environmental protection atmosphere pollution, a urea is directly spouted SNCR and SCR and is united denitration process units.
Background
The environmental protection air pollution treatment denitration technology comprises an SCR denitration technology, an SNCR denitration technology, an ozone oxidation technology and the like, and has advantages and disadvantages. The SCR denitration technology is a selective catalytic reduction denitration technology, the SNCR denitration technology is a non-selective catalytic reduction denitration technology, liquid ammonia, ammonia water or urea are used as reducing agents, and the SCR adopts a catalyst to carry out denitration catalytic reduction reaction to remove nitrogen oxides NOx in flue gas. The SNCR does not adopt a catalyst, and a reducing agent is directly sprayed into a hearth to carry out reduction reaction under the condition of an optimal temperature field at the high temperature of 850-1250 ℃.
The SCR denitration reaction principle is as follows:
4NH3+4NO+O2→4N2+6H2O
4NH3+2NO2+O2→3N2+6H2O
the SNCR denitration reaction principle is as follows:
4NH3+4NO+O2→4N2+6H2O
4NH3+6NO2→5N2+6H2O
the SCR denitration has the main advantages of mature technology and high denitration efficiency, and has the defects that a denitration reactor is generally required to be arranged, a honeycomb type or plate type catalyst is additionally arranged, the investment is high, and a flue gas system occupies large space; the SNCR denitration technology is mature, the investment is low, and the defect is that the denitration efficiency of boilers such as pulverized coal is low.
Disclosure of Invention
The popularization and application of SCR and SNCR denitration technologies are limited by the problems. In view of the defects in the prior art, the utility model aims to provide a direct injection pyrolysis denitration process device in a urea furnace, which has low energy consumption and small investment.
The utility model discloses make full use of SCR denitration technique and SNCR denitration technical characterstic, adopted urea solution and liquid catalyst combination mode, provided a urea and directly spouted SNCR and SCR and unite denitration process units to reach the purpose that the denitration investment is low.
The technical solution of the utility model is that: the utility model provides a denitration process units is united to urea direct injection SNCR and SCR which characterized in that: the urea solution pipeline, the liquid catalyst pipeline and the dilution water pipeline are respectively connected with the metering and distributing module, the mixed solution is conveyed to a urea solution and liquid catalyst mixing ejector through pipelines, and the urea solution and liquid catalyst mixing ejector is respectively arranged in a boiler hearth and a boiler steering chamber.
The urea solution and liquid catalyst mixing injector is a liquid and atomized air mixing dual-fluid injector.
The utility model has the advantages that: a liquid catalyst is used for replacing a honeycomb type or plate type catalyst and a reactor which are additionally arranged, the liquid catalyst and urea solution are mixed and sprayed into a boiler hearth through an injector, and SCNR and SCR denitration reaction is carried out; for the denitration upgrading project of the existing denitration reactor device, a mode of additionally arranging an injector in a boiler steering chamber is adopted, a reducing agent and a catalyst are supplemented, and the denitration reaction efficiency is improved. The process combination device has the advantages of simple process, investment saving and high denitration efficiency.
Drawings
Fig. 1 is a schematic diagram of an embodiment of the present invention.
In the figure: 1. metering and distributing module, 1.1 dilution water pipeline, 1.2 urea solution pipeline, 1.3 liquid catalyst pipeline, 2 urea solution and liquid catalyst mixing ejector, 3 boiler furnace, 4 boiler turn-around chamber.
Detailed Description
The detailed description is described in conjunction with the appended drawings:
a urea directly spouts SNCR and SCR and unites denitration process units, includes: the denitration device comprises a metering distribution module 1, a dilution water pipeline 1.1, a urea solution pipeline 1.2, a liquid catalyst pipeline 1.3, a urea solution and liquid catalyst mixing ejector 2, a boiler hearth 3 and a boiler steering chamber 4, and the denitration purpose is realized in the following mode.
The method comprises the steps that about 50% of urea solution, diluted water and liquid catalyst respectively enter a metering distribution module 1 through pipelines, solution concentration and flow metering distribution is carried out according to changes of flue gas temperature and nitrogen oxide concentration, the urea solution and liquid catalyst are conveyed to a urea solution and liquid catalyst mixing injector 2 through pipelines, the urea solution and liquid catalyst and atomized air are mixed and atomized and then are sprayed into a boiler hearth 3, a sintering machine and other high-temperature regions to carry out SNCR and SCR combined denitration reaction, for denitration upgrading projects of existing denitration reactor devices, a mode that the urea solution and liquid catalyst mixing injector 2 is additionally arranged in a boiler turning chamber 4 in a medium-temperature region is adopted, reducing agents and catalysts are supplemented, and denitration reaction efficiency is improved.
Claims (2)
1. The utility model provides a denitration process units is united to urea direct injection SNCR and SCR which characterized in that: the urea solution pipeline (1.2), the liquid catalyst pipeline (1.3) and the dilution water pipeline (1.1) are respectively connected with the metering and distributing module (1), the mixed solution is conveyed to the urea solution and liquid catalyst mixing ejector (2) through pipelines, and the urea solution and liquid catalyst mixing ejector (2) are respectively arranged in the boiler hearth (3) and the boiler steering chamber (4).
2. The urea direct injection SNCR and SCR combined denitration process device according to claim 1, characterized in that: the urea solution and liquid catalyst mixing injector (2) is a liquid and atomized air mixing double-fluid injector.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202023141159.5U CN215196260U (en) | 2020-12-23 | 2020-12-23 | Urea direct injection SNCR and SCR combined denitration process device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202023141159.5U CN215196260U (en) | 2020-12-23 | 2020-12-23 | Urea direct injection SNCR and SCR combined denitration process device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN215196260U true CN215196260U (en) | 2021-12-17 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202023141159.5U Active CN215196260U (en) | 2020-12-23 | 2020-12-23 | Urea direct injection SNCR and SCR combined denitration process device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN215196260U (en) |
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2020
- 2020-12-23 CN CN202023141159.5U patent/CN215196260U/en active Active
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| PE01 | Entry into force of the registration of the contract for pledge of patent right | ||
| PE01 | Entry into force of the registration of the contract for pledge of patent right |
Denomination of utility model: A urea direct injection SNCR and SCR combined denitration process unit Effective date of registration: 20221212 Granted publication date: 20211217 Pledgee: Dalian Branch of Shanghai Pudong Development Bank Co.,Ltd. Pledgor: DALIAN BEST ENVIRONMENT EQUIPMENT Co.,Ltd. Registration number: Y2022980026415 |
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| PC01 | Cancellation of the registration of the contract for pledge of patent right | ||
| PC01 | Cancellation of the registration of the contract for pledge of patent right |
Date of cancellation: 20240103 Granted publication date: 20211217 Pledgee: Dalian Branch of Shanghai Pudong Development Bank Co.,Ltd. Pledgor: DALIAN BEST ENVIRONMENT EQUIPMENT Co.,Ltd. Registration number: Y2022980026415 |
|
| PE01 | Entry into force of the registration of the contract for pledge of patent right | ||
| PE01 | Entry into force of the registration of the contract for pledge of patent right |
Denomination of utility model: A urea direct injection SNCR and SCR combined denitrification process device Granted publication date: 20211217 Pledgee: Dalian Branch of Shanghai Pudong Development Bank Co.,Ltd. Pledgor: DALIAN BEST ENVIRONMENT EQUIPMENT Co.,Ltd. Registration number: Y2024980001872 |