CN114570177A - Biomass calcium-based solid denitration agent and preparation method thereof - Google Patents
Biomass calcium-based solid denitration agent and preparation method thereof Download PDFInfo
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- CN114570177A CN114570177A CN202210325517.2A CN202210325517A CN114570177A CN 114570177 A CN114570177 A CN 114570177A CN 202210325517 A CN202210325517 A CN 202210325517A CN 114570177 A CN114570177 A CN 114570177A
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- 239000002028 Biomass Substances 0.000 title claims abstract description 33
- 239000003795 chemical substances by application Substances 0.000 title claims abstract description 25
- 239000007787 solid Substances 0.000 title claims abstract description 25
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 title claims abstract description 22
- 229910052791 calcium Inorganic materials 0.000 title claims abstract description 22
- 239000011575 calcium Substances 0.000 title claims abstract description 22
- 238000002360 preparation method Methods 0.000 title claims abstract description 6
- 159000000007 calcium salts Chemical class 0.000 claims abstract description 11
- 239000002270 dispersing agent Substances 0.000 claims abstract description 9
- 239000000618 nitrogen fertilizer Substances 0.000 claims abstract description 9
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 9
- 239000000463 material Substances 0.000 claims description 5
- 238000000034 method Methods 0.000 claims description 5
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 claims description 4
- ZFSLODLOARCGLH-UHFFFAOYSA-N isocyanuric acid Chemical compound OC1=NC(O)=NC(O)=N1 ZFSLODLOARCGLH-UHFFFAOYSA-N 0.000 claims description 4
- -1 amine salts Chemical class 0.000 claims description 3
- 125000003178 carboxy group Chemical group [H]OC(*)=O 0.000 claims description 3
- 238000000227 grinding Methods 0.000 claims description 3
- 229920005610 lignin Polymers 0.000 claims description 3
- ISWSIDIOOBJBQZ-UHFFFAOYSA-N phenol group Chemical group C1(=CC=CC=C1)O ISWSIDIOOBJBQZ-UHFFFAOYSA-N 0.000 claims description 3
- 229920002401 polyacrylamide Polymers 0.000 claims description 3
- 239000002994 raw material Substances 0.000 claims description 3
- 150000001413 amino acids Chemical class 0.000 claims description 2
- 229910021529 ammonia Inorganic materials 0.000 claims description 2
- 150000003863 ammonium salts Chemical class 0.000 claims description 2
- 125000000468 ketone group Chemical group 0.000 claims description 2
- 239000000203 mixture Substances 0.000 claims description 2
- 239000000126 substance Substances 0.000 claims 2
- 239000007788 liquid Substances 0.000 claims 1
- 150000003254 radicals Chemical class 0.000 claims 1
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 5
- 239000003546 flue gas Substances 0.000 description 5
- 239000000843 powder Substances 0.000 description 4
- 239000000047 product Substances 0.000 description 4
- 239000007789 gas Substances 0.000 description 3
- 239000012265 solid product Substances 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 2
- XSQUKJJJFZCRTK-UHFFFAOYSA-N Urea Chemical compound NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 description 2
- 239000004202 carbamide Substances 0.000 description 2
- 239000000428 dust Substances 0.000 description 2
- 238000010298 pulverizing process Methods 0.000 description 2
- QGZKDVFQNNGYKY-UHFFFAOYSA-O Ammonium Chemical compound [NH4+] QGZKDVFQNNGYKY-UHFFFAOYSA-O 0.000 description 1
- VHUUQVKOLVNVRT-UHFFFAOYSA-N Ammonium hydroxide Chemical compound [NH4+].[OH-] VHUUQVKOLVNVRT-UHFFFAOYSA-N 0.000 description 1
- 239000004480 active ingredient Substances 0.000 description 1
- 239000000809 air pollutant Substances 0.000 description 1
- 231100001243 air pollutant Toxicity 0.000 description 1
- 235000011114 ammonium hydroxide Nutrition 0.000 description 1
- BFNBIHQBYMNNAN-UHFFFAOYSA-N ammonium sulfate Chemical compound N.N.OS(O)(=O)=O BFNBIHQBYMNNAN-UHFFFAOYSA-N 0.000 description 1
- 229910052921 ammonium sulfate Inorganic materials 0.000 description 1
- 235000011130 ammonium sulphate Nutrition 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000003337 fertilizer Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000009776 industrial production Methods 0.000 description 1
- 150000002576 ketones Chemical class 0.000 description 1
- 239000012263 liquid product Substances 0.000 description 1
- 229920002521 macromolecule Polymers 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- 230000009466 transformation Effects 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
- 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
- B01D53/77—Liquid phase processes
- B01D53/78—Liquid phase processes with gas-liquid contact
-
- 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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2251/00—Reactants
- B01D2251/40—Alkaline earth metal or magnesium compounds
- B01D2251/404—Alkaline earth metal or magnesium compounds of calcium
-
- 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
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W10/00—Technologies for wastewater treatment
- Y02W10/10—Biological treatment of water, waste water, or sewage
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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)
- Fertilizers (AREA)
Abstract
Description
技术领域technical field
本发明涉及脱硝剂技术领域，特别是涉及一种生物质钙基固体脱硝剂及制备方法。The invention relates to the technical field of denitration agents, in particular to a biomass calcium-based solid denitration agent and a preparation method.
背景技术Background technique
随着国家对大气污染物排放指标的日益提高，超低排放、近零排放的要求不断出现，NOX作为工业生产排放气体中的有害气体，对其控制首当其冲，各排放污染气体的企业也想尽办法达到环保排放指标。With the increasing improvement of the country's air pollutant emission indicators, the requirements for ultra-low emission and near-zero emission continue to emerge. As a harmful gas in industrial production emissions, NO X bears the brunt of its control. Enterprises that emit polluting gases also want to Do everything possible to meet environmental emission targets.
还原法脱除NOX气体通常有SCR脱硝和SNCR脱硝两种办法，SCR脱硝温度窗口为160-420℃，SNCR脱硝温度窗口为800-1100℃。SCR脱硝投资高，系统复杂，脱硝效率高；SNCR脱硝投资低，系统简单，脱硝效率低，对脱硝温度窗口要求严格。There are usually two methods to remove NO X gas by reduction method: SCR denitration and SNCR denitration. SCR denitration has high investment, complex system, and high denitration efficiency; SNCR denitration has low investment, simple system, low denitration efficiency, and strict requirements on the denitration temperature window.
对已经上过SCR脱硝，又没有再改造空间；或炉内烟气温度低于750℃，不能采用传统SNCR。现想提高NOX排放指标，成了摆在企业面前的难题。如中温中压生物质振动炉排锅炉烟气，炉内烟气温度700-750℃，生物质锅炉烟气成分复杂，也不能使用高尘段SCR脱硝，低尘段SCR脱硝涉及烟气升温投资大，运行成本高。For those who have already gone through SCR denitration, and there is no room for further modification; or the flue gas temperature in the furnace is lower than 750℃, traditional SNCR cannot be used. It is now a difficult problem for enterprises to improve the NO X emission index. For example, the flue gas of the medium temperature and medium pressure biomass vibrating grate boiler, the flue gas temperature in the furnace is 700-750 ℃, the flue gas composition of the biomass boiler is complex, and the high dust section SCR denitrification cannot be used, and the low dust section SCR denitrification involves investment in flue gas heating large and high operating costs.
发明内容SUMMARY OF THE INVENTION
本发明针对上述技术问题，克服现有技术的缺点，提供一种生物质钙基固体脱硝剂，包括生物质钙盐10%-30%、氮肥及衍物30%-60%、分散剂2%-20%、水0%-50%。Aiming at the above-mentioned technical problems, the present invention overcomes the shortcomings of the prior art, and provides a biomass calcium-based solid denitrification agent, comprising 10%-30% of biomass calcium salt, 30%-60% of nitrogen fertilizer and derivatives, and 2% of dispersant. -20%, water 0%-50%.
本发明进一步限定的技术方案是：The technical scheme that the present invention is further limited is:
前所述的一种生物质钙基固体脱硝剂，生物质钙盐中有效成分80%以上，是带有活性基团的大分子,高温下能分解出自由基类的物质。The above-mentioned biomass calcium-based solid denitration agent has more than 80% of the active ingredients in the biomass calcium salt, which is a macromolecule with active groups, and can decompose free radicals at high temperature.
前所述的一种生物质钙基固体脱硝剂，活性基团包括羧基、酚基或酮基。In the aforementioned biomass calcium-based solid denitration agent, the active group includes a carboxyl group, a phenol group or a ketone group.
前所述的一种生物质钙基固体脱硝剂，氮肥及衍物为铵盐、胺盐或氰尿酸，高温下能分解出氨的物质。In the aforementioned biomass calcium-based solid denitrification agent, nitrogen fertilizer and its derivatives are ammonium salt, amine salt or cyanuric acid, which can decompose ammonia at high temperature.
前所述的一种生物质钙基固体脱硝剂，分散剂包括聚丙烯酰胺、氨基酸、木质素中的一种或多种，能使生物质钙基脱硝剂在水中形成均一稳定的溶液。In the aforementioned biomass calcium-based solid denitrification agent, the dispersing agent includes one or more of polyacrylamide, amino acid and lignin, which can enable the biomass calcium-based denitrification agent to form a uniform and stable solution in water.
前所述的一种生物质钙基固体脱硝剂，SNCR脱硝的反应有效温度窗口在550-1100℃之间。For the above-mentioned biomass calcium-based solid denitrification agent, the effective temperature window of SNCR denitration reaction is between 550-1100°C.
本发明的另一目的在于提供一种生物质钙基固体脱硝剂制备方法，将原辅材料生物质钙盐、氮肥及衍物、分散剂分别加入粉碎机中粉碎，粉碎后的原料再进混料机混合均匀，最后混和料再进细磨机细磨，得粉状固体成品，粉状固体成品加水后制得液体成品。Another object of the present invention is to provide a method for preparing a biomass calcium-based solid denitrification agent. The raw and auxiliary materials biomass calcium salt, nitrogen fertilizer and derivatives, and dispersant are respectively added to a pulverizer for pulverization, and the pulverized raw materials are then mixed. The feeder mixes evenly, and finally the mixed material is fed into a fine mill for fine grinding to obtain a powdery solid product, and the powdery solid product is added with water to obtain a liquid product.
本发明的有益效果是：可降低SNCR脱硝的反应温度窗口，实现了在较低温度下SNCR脱硝反应；制成固体粉状成品可降低运输成本，实现远距离运输；采用流化风将脱硝喷入炉膛内或烟道中，与氨水或尿素溶液相比，设备少，投资低。The beneficial effects of the invention are as follows: the reaction temperature window of SNCR denitration can be reduced, and the SNCR denitration reaction can be realized at a lower temperature; the transportation cost can be reduced and long-distance transportation can be realized by making solid powder products; Into the furnace or flue, compared with ammonia water or urea solution, the equipment is less and the investment is low.
具体实施方式Detailed ways
实施例1Example 1
本实施例提供的一种生物质钙基固体脱硝剂，包括生物质钙盐（羧基、酚基钙盐）25%，氮肥及衍物（硫酸铵70%+氰尿酸30%）60%，分散剂（木质素）15%。A biomass calcium-based solid denitrification agent provided in this embodiment includes 25% biomass calcium salts (carboxyl and phenolic calcium salts), 60% nitrogen fertilizers and derivatives (70% ammonium sulfate + 30% cyanuric acid), dispersed Agent (lignin) 15%.
制备方法：将原辅材料生物质钙盐、氮肥及衍物、分散剂分别加入粉碎机中粉碎，粉碎后的原料再进混料机混合均匀，最后混和料再进细磨机细磨，得粉状固体成品。Preparation method: the raw and auxiliary materials biomass calcium salt, nitrogen fertilizer and derivatives, and dispersant are respectively added to the pulverizer for pulverization, the pulverized raw materials are then fed into the mixer to mix evenly, and finally the mixed material is fed into the fine mill for fine grinding to obtain Powdered solid product.
此配方制成的是固体粉状成品，在应用时需配制成溶液，加水量与干粉量相等，搅拌均匀后使用。固体粉状成品可降低运输成本，可远距离运输。This formula is a solid powder product, which needs to be prepared into a solution during application. The amount of water added is equal to the amount of dry powder, and it is used after stirring evenly. Solid powder finished products can reduce transportation costs and can be transported over long distances.
实施例2Example 2
本实施例提供的一种生物质钙基固体脱硝剂，与实施例1的不同在于，生物质钙盐（酚基+酮基钙盐）10%、氮肥及衍物（其中尿素60%+硫酸铵20%+氰尿酸20%）30%、分散剂（聚丙烯酰胺）10%、水50%。The biomass calcium-based solid denitrification agent provided in this example is different from Example 1 in that biomass calcium salt (phenol-based + ketone-based calcium salt) 10%, nitrogen fertilizer and derivatives (including urea 60% + sulfuric acid) Ammonium 20% + cyanuric acid 20%) 30%, dispersant (polyacrylamide) 10%, water 50%.
此配方制成的是溶液状成品，可直接使用，但运输成本高，适用于生产装置附近的电厂使用。This formula is a finished product in solution, which can be used directly, but the transportation cost is high, and it is suitable for use in power plants near the production unit.
除上述实施例外，本发明还可以有其他实施方式。凡采用等同替换或等效变换形成的技术方案，均落在本发明要求的保护范围。In addition to the above-described embodiments, the present invention may also have other embodiments. All technical solutions formed by equivalent replacement or equivalent transformation fall within the protection scope of the present invention.
Claims (7)
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| CN202210325517.2A CN114570177A (en) | 2022-03-30 | 2022-03-30 | Biomass calcium-based solid denitration agent and preparation method thereof |
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Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2010052992A (en) * | 2008-08-28 | 2010-03-11 | Tanabe Kensetsu Kk | Material for cleaning gas phase environment and method for producing the same |
| CN104174277A (en) * | 2014-08-22 | 2014-12-03 | 华中科技大学 | Preparation method of efficient desulfurization and denitration agent for coal-fired boiler and application of efficient desulfurization and denitration agent for coal-fired boiler |
| US20180043302A1 (en) * | 2015-03-20 | 2018-02-15 | Yongfeng Boyuan Industry Co. Ltd., Jiangxi Province | Desulfurization and denitration agent |
| CN107930384A (en) * | 2017-11-23 | 2018-04-20 | 邓丽珍 | A kind of composite biomass denitrfying agent |
| CN109201001A (en) * | 2018-11-03 | 2019-01-15 | 中国农业科学院农业环境与可持续发展研究所 | A kind of preparation method of selective absorbent |
| CN111495178A (en) * | 2020-04-08 | 2020-08-07 | 天津洁创环保科技有限公司 | Desulfurization and denitrification agent and preparation method and application thereof |
| CN113908723A (en) * | 2021-09-01 | 2022-01-11 | 苏州道源华智环保科技有限公司 | Preparation method and production equipment of flue gas denitration agent |
-
2022
- 2022-03-30 CN CN202210325517.2A patent/CN114570177A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2010052992A (en) * | 2008-08-28 | 2010-03-11 | Tanabe Kensetsu Kk | Material for cleaning gas phase environment and method for producing the same |
| CN104174277A (en) * | 2014-08-22 | 2014-12-03 | 华中科技大学 | Preparation method of efficient desulfurization and denitration agent for coal-fired boiler and application of efficient desulfurization and denitration agent for coal-fired boiler |
| US20180043302A1 (en) * | 2015-03-20 | 2018-02-15 | Yongfeng Boyuan Industry Co. Ltd., Jiangxi Province | Desulfurization and denitration agent |
| CN107930384A (en) * | 2017-11-23 | 2018-04-20 | 邓丽珍 | A kind of composite biomass denitrfying agent |
| CN109201001A (en) * | 2018-11-03 | 2019-01-15 | 中国农业科学院农业环境与可持续发展研究所 | A kind of preparation method of selective absorbent |
| CN111495178A (en) * | 2020-04-08 | 2020-08-07 | 天津洁创环保科技有限公司 | Desulfurization and denitrification agent and preparation method and application thereof |
| CN113908723A (en) * | 2021-09-01 | 2022-01-11 | 苏州道源华智环保科技有限公司 | Preparation method and production equipment of flue gas denitration agent |
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Application publication date: 20220603 |