CN113694958A - Preparation method and application of SNCR synergist - Google Patents
Preparation method and application of SNCR synergist Download PDFInfo
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- 238000002360 preparation method Methods 0.000 title claims abstract description 20
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical group N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 claims abstract description 40
- MWUXSHHQAYIFBG-UHFFFAOYSA-N nitrogen oxide Inorganic materials O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 claims abstract description 23
- 229910021529 ammonia Inorganic materials 0.000 claims abstract description 20
- 238000000034 method Methods 0.000 claims abstract description 14
- 238000005216 hydrothermal crystallization Methods 0.000 claims abstract description 13
- 239000002994 raw material Substances 0.000 claims abstract description 13
- 239000003513 alkali Substances 0.000 claims abstract description 11
- 238000001354 calcination Methods 0.000 claims abstract description 11
- 239000013078 crystal Substances 0.000 claims abstract description 11
- 239000003546 flue gas Substances 0.000 claims abstract description 11
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims abstract description 10
- 230000018044 dehydration Effects 0.000 claims abstract description 4
- 238000006297 dehydration reaction Methods 0.000 claims abstract description 4
- 239000011259 mixed solution Substances 0.000 claims abstract description 4
- 238000003756 stirring Methods 0.000 claims abstract description 4
- 238000005406 washing Methods 0.000 claims abstract description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 4
- 239000002956 ash Substances 0.000 claims description 16
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 15
- 239000000203 mixture Substances 0.000 claims description 14
- 239000007788 liquid Substances 0.000 claims description 9
- 239000000243 solution Substances 0.000 claims description 9
- NLXLAEXVIDQMFP-UHFFFAOYSA-N Ammonia chloride Chemical compound [NH4+].[Cl-] NLXLAEXVIDQMFP-UHFFFAOYSA-N 0.000 claims description 8
- 239000003638 chemical reducing agent Substances 0.000 claims description 8
- XSQUKJJJFZCRTK-UHFFFAOYSA-N Urea Chemical compound NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 claims description 4
- 235000019270 ammonium chloride Nutrition 0.000 claims description 4
- 239000004202 carbamide Substances 0.000 claims description 4
- 238000006243 chemical reaction Methods 0.000 claims description 4
- 239000010881 fly ash Substances 0.000 claims description 4
- VHUUQVKOLVNVRT-UHFFFAOYSA-N Ammonium hydroxide Chemical compound [NH4+].[OH-] VHUUQVKOLVNVRT-UHFFFAOYSA-N 0.000 claims description 3
- 235000011114 ammonium hydroxide Nutrition 0.000 claims description 3
- BFNBIHQBYMNNAN-UHFFFAOYSA-N ammonium sulfate Chemical compound N.N.OS(O)(=O)=O BFNBIHQBYMNNAN-UHFFFAOYSA-N 0.000 claims description 3
- 229910052921 ammonium sulfate Inorganic materials 0.000 claims description 3
- 235000011130 ammonium sulphate Nutrition 0.000 claims description 3
- 229910052723 transition metal Inorganic materials 0.000 abstract description 5
- 238000004519 manufacturing process Methods 0.000 abstract description 4
- 239000000463 material Substances 0.000 abstract description 4
- -1 flue gas nitrogen oxides Chemical class 0.000 abstract description 2
- 238000000746 purification Methods 0.000 abstract description 2
- 239000002910 solid waste Substances 0.000 abstract description 2
- 230000003197 catalytic effect Effects 0.000 abstract 2
- 238000001027 hydrothermal synthesis Methods 0.000 abstract 1
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 8
- 230000008901 benefit Effects 0.000 description 5
- 238000010531 catalytic reduction reaction Methods 0.000 description 5
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 4
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 4
- 229910052782 aluminium Inorganic materials 0.000 description 4
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 4
- 229910052742 iron Inorganic materials 0.000 description 4
- 239000002808 molecular sieve Substances 0.000 description 4
- 239000002245 particle Substances 0.000 description 4
- 229910052710 silicon Inorganic materials 0.000 description 4
- 239000010703 silicon Substances 0.000 description 4
- URGAHOPLAPQHLN-UHFFFAOYSA-N sodium aluminosilicate Chemical compound [Na+].[Al+3].[O-][Si]([O-])=O.[O-][Si]([O-])=O URGAHOPLAPQHLN-UHFFFAOYSA-N 0.000 description 4
- 230000004913 activation Effects 0.000 description 3
- 239000007789 gas Substances 0.000 description 3
- 238000011068 loading method Methods 0.000 description 3
- 229910000069 nitrogen hydride Inorganic materials 0.000 description 3
- 101150005267 Add1 gene Proteins 0.000 description 2
- 101150014859 Add3 gene Proteins 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- 230000003213 activating effect Effects 0.000 description 2
- 101150060298 add2 gene Proteins 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 229910052799 carbon Inorganic materials 0.000 description 2
- 239000003054 catalyst Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000002347 injection Methods 0.000 description 2
- 239000007924 injection Substances 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 229910052757 nitrogen Inorganic materials 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 description 2
- 230000002195 synergetic effect Effects 0.000 description 2
- 239000012747 synergistic agent Substances 0.000 description 2
- 230000002194 synthesizing effect Effects 0.000 description 2
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 1
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 description 1
- 239000004115 Sodium Silicate Substances 0.000 description 1
- 238000005054 agglomeration Methods 0.000 description 1
- 230000002776 aggregation Effects 0.000 description 1
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 1
- 239000003245 coal Substances 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 229910052593 corundum Inorganic materials 0.000 description 1
- 238000002425 crystallisation Methods 0.000 description 1
- 230000008025 crystallization Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 238000006386 neutralization reaction Methods 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 235000019353 potassium silicate Nutrition 0.000 description 1
- 238000010248 power generation Methods 0.000 description 1
- 239000010453 quartz Substances 0.000 description 1
- 239000012495 reaction gas Substances 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000006722 reduction reaction Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 1
- 229910052708 sodium Inorganic materials 0.000 description 1
- 239000011734 sodium Substances 0.000 description 1
- 229910052911 sodium silicate Inorganic materials 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000010189 synthetic method Methods 0.000 description 1
- 239000002912 waste gas Substances 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
- 230000003313 weakening effect Effects 0.000 description 1
- 229910001845 yogo sapphire Inorganic materials 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
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
- B01D53/86—Catalytic processes
- B01D53/8621—Removing nitrogen compounds
- B01D53/8625—Nitrogen oxides
- B01D53/8628—Processes characterised by a specific catalyst
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J29/00—Catalysts comprising molecular sieves
- B01J29/04—Catalysts comprising molecular sieves having base-exchange properties, e.g. crystalline zeolites
- B01J29/06—Crystalline aluminosilicate zeolites; Isomorphous compounds thereof
- B01J29/40—Crystalline aluminosilicate zeolites; Isomorphous compounds thereof of the pentasil type, e.g. types ZSM-5, ZSM-8 or ZSM-11, as exemplified by patent documents US3702886, GB1334243 and US3709979, respectively
-
- 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
- B01D2251/2062—Ammonia
-
- 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
-
- 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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2258/00—Sources of waste gases
- B01D2258/02—Other waste gases
- B01D2258/0283—Flue gases
Abstract
The invention belongs to the technical field of flue gas purification in industrial processes, and discloses a preparation method and application of an SNCR synergist. The method comprises the steps of stirring raw materials, an alkali source, a seed crystal and water to obtain a mixed solution, and carrying out hydrothermal crystallization, dehydration, ammonia exchange, washing and calcination to obtain the synergist. The synergist synthesized by the invention utilizes the catalytic performance of transition metal elements in solid waste materials, and adopts hydrothermal reaction to prepare a cheap catalytic material with high specific surface area. The SNCR denitration efficiency can be greatly improved within a wide temperature range of 500-950 ℃, the preparation process is simple, the economical efficiency is excellent, and the method can be used for controlling the emission of high-temperature flue gas nitrogen oxides in the industrial process.
Description
Technical Field
The invention belongs to the technical field of industrial process waste gas purification, and particularly relates to a preparation method and application of an SNCR synergist.
Background
The denitration reducing agent can be used for converting nitrogen oxides in the flue gas into nitrogen under the medium-high temperature condition, so that the aim of denitration is fulfilled. When the temperature of the flue gas is about 300-400 ℃, a V/W/Ti catalyst can be adopted to catalyze the process of reducing nitrogen oxides by reducing agents such as ammonia or urea. When the temperature of the flue gas is 850-1100 ℃, reducing agents such as ammonia or urea can be directly adopted to reduce nitrogen oxides, a catalyst is not needed, and high denitration efficiency can be achieved.
In recent years, in order to actively respond to strategic targets of carbon peak reaching and carbon neutralization in China, the coal-fired power generation industry as basic energy sources gradually takes on the role of deep peak regulation so as to ensure the vigorous development of renewable energy sources. And when the boiler operates at low load, the temperature of the hearth is low, and the temperature of the SNCR reducing agent injection point is always lower than the optimal denitration temperature range, so that the direct ammonia injection effect is reduced. Therefore, research on a 600-950 ℃ denitration synergistic method needs to be carried out.
Disclosure of Invention
The invention aims to provide an SNCR synergist and a preparation method and application thereof, so as to realize high-efficiency removal of nitrogen oxides within a wide temperature range of 500-950 ℃.
Part of hydrogen type molecular sieves (such as HZSM-5 and HSSZ-13) have certain catalytic reduction NOx activity in a temperature range of 600-950 ℃. However, the practical use of the material still faces the problems of high cost and limited economy. Boiler circulating ash is cheap waste and has Si required by synthesizing molecular sieve due to chemical property2O3And Al2O3The silicon source and the aluminum source simultaneously contain a certain amount of iron and other transition metal elements, which are beneficial to the loading and activation in the preparation process of the molecular sieve, so that the molecular sieve has the capability of catalytically reducing NOx under the medium-high temperature condition.
The invention is realized by the following technical scheme:
a method for preparing an SNCR synergist, which comprises the following steps: stirring raw materials, an alkali source, a seed crystal and water to obtain a mixed solution, and performing hydrothermal crystallization, dehydration, ammonia exchange, washing and calcination to obtain the synergist.
The preparation method of the SNCR synergist is characterized in that the raw material is one or a mixture of circulating ash, fly ash and desulfurized ash.
The preparation method of the SNCR synergist is characterized in that the alkali source is one or a mixture of sodium hydroxide and ammonia water, the concentration of alkali liquor is 0.1-5 mol/L, and the solid-to-liquid ratio is 1-10 g/ml.
The preparation method of the SNCR synergist is characterized in that the seed crystal is one or a mixture of HZSM-5 and HSSZ-13, and the dosage of the seed crystal is 0.1-5% of the mass of the raw material.
The preparation method of the SNCR synergist is characterized in that the ammonia exchange solution is one or a mixture of ammonium chloride and ammonium sulfate, the concentration of the solution is 0.1-5 mol/L, and the solid-to-liquid ratio is 1-10 g/ml.
The preparation method of the SNCR synergist is characterized in that the hydrothermal crystallization temperature is 70-95 ℃, and the hydrothermal crystallization time is 3-12 hours; the ammonia exchange temperature is 75-85 ℃, and the time is 0.5-4 hours; the calcination is carried out on line in a high-temperature furnace or a medium-high temperature denitration application, the temperature is 500-950 ℃, and the calcination time is 1-5 hours.
The application of the SNCR synergist is characterized in that: the synergist is applied to denitration reaction of NOx-containing flue gas at medium-high temperature of 500-950 ℃, and a nitrogen oxide reducing agent adopted in medium-high temperature denitration is one or a mixture of ammonia and urea.
Compared with the prior art, the invention has the following advantages and beneficial effects:
1) the economic efficiency is as follows: the silicon source and the aluminum source in the raw materials needed for synthesizing the synergist are from low-cost solid wastes, but not higher-price pure-phase sodium metaaluminate, sodium silicate (water glass) and other materials, and the synergist has excellent technical economy.
2) Effectiveness: the raw material ash contains a certain amount of iron and other transition metal elements, and the iron and other transition metal elements have the function of adsorbing and activating a reducing agent NH3And the capability of catalytic reduction of NOx can be used for carrying out effective loading and activation by utilizing the advantage of large specific surface area in the preparation process of the synergistic agent, so that the capability of catalytic reduction of NOx under the medium-high temperature condition is realized.
3) Convenience: the raw material circulating ash comes from a circulating fluidized bed boiler, the particle size of the ash is about 0.1-0.3 mm, only surface modification is carried out on particles in the preparation process, and the particle size is kept unchanged. Therefore, the finished product synergist is convenient to add into an actual boiler, such as mixing with coal and adding separately by pneumatic conveying, and the like, and is convenient to newly build or modify and easy to industrially realize.
4) And (3) synergy: the synthesized synergist component has the advantages of high specific surface area, porous structure and the like, and is easy to adsorb unreacted NH3Molecules, thereby weakening the ammonia escape phenomenon in the denitration process.
In a word, compared with the existing medium-high temperature denitration technology, the method has the advantages of wide denitration temperature range, excellent economy, strong convenience and reduction of ammonia escape, and can be used for emission control of nitrogen oxides in medium-high temperature flue gas in an industrial process.
Detailed Description
The present invention is further illustrated by the following examples, which are provided for the purpose of illustration only and are not intended to limit the scope of the present invention. It is to be understood that the present invention is not limited to the specific embodiments described below, and that various changes and modifications may be made by one skilled in the art within the scope of the appended claims.
The invention aims to provide an SNCR (selective non-catalytic reduction) synergistic denitration method, which is characterized in that the preparation method of an SNCR synergistic agent comprises the following steps: stirring raw materials, an alkali source, a seed crystal and water to obtain a mixed solution, and performing hydrothermal crystallization, dehydration, ammonia exchange, washing and calcination to obtain the synergist.
In a specific embodiment, the raw material is one or a mixture of circulating ash, fly ash and desulfurized ash.
In one embodiment, the alkali source is one or a mixture of sodium hydroxide and ammonia water, the concentration of the alkali liquor is 0.1-5 mol/L, and the solid-liquid ratio is 1-10 g/ml.
In a specific embodiment, the seed crystal is one or a mixture of two of HZSM-5 and HSSZ-13, and the dosage of the seed crystal is 0.1-5% of the mass of the raw material.
In one embodiment, the ammonia exchange solution is one or a mixture of ammonium chloride and ammonium sulfate, the concentration of the solution is 0.1-5 mol/L, and the solid-to-liquid ratio is 1-10 g/ml.
In the synthetic method of the SNCR synergist, the hydrothermal crystallization temperature is 70-95 ℃, and the hydrothermal crystallization time is 3-12 hours; the ammonia exchange temperature is 75-85 ℃, and the time is 0.5-4 hours; the calcination is carried out on line in a high-temperature furnace or a medium-high temperature denitration application, the temperature is 500-950 ℃, and the calcination time is 1-5 hours.
The SNCR synergist disclosed by the invention is applied to denitration reaction of NOx-containing flue gas at medium-high temperature of 500-950 ℃ by utilizing a certain amount of iron and other transition metal elements contained in fly ash or circulating ash, and has the function of adsorbing and activating a reducing agent NH3Is active-NH2Amino groups, which subsequently bind the NOx molecules in the flue gas and further reduce them to harmless N2And H2And O. On the other hand, the synergist can be used for carrying out effective loading and activation by utilizing the advantage of large specific surface area in the preparation process of the synergist, so that the active metal component can be dispersed and loaded in a particle pore channel structure without agglomeration, and the synergist has the capability of carrying out catalytic reduction on NOx under the medium-high temperature condition.
Example 1
An SNCR synergist comprises a silicon source and an aluminum source which are circulating ash, an alkali source which is NaOH, the concentration of the NaOH is 1mol/L, and the solid-liquid ratio is 5 g/ml; the seed crystal is HZSM-5 with the mass content of 1%; the ammonia exchange solution is ammonium chloride, the concentration of the solution is 1mol/L, and the solid-to-liquid ratio is 5 g/ml.
The preparation method comprises the following steps: the hydrothermal crystallization temperature is 90 ℃, and the crystallization time is 10 hours; the ammonia exchange temperature is 80 ℃ and the time is 3 hours; the calcination is carried out on line in a muffle furnace or a medium-high temperature denitration application at 850 ℃ for 2 hours. After cooling, a synergist sample was obtained, which was designated Add 1.
Example 2
The method comprises the following steps of 1, wherein a silicon source and an aluminum source are circulating ash and desulfurized ash, and the mass ratio of the circulating ash to the desulfurized ash is 1: 1. a booster sample was obtained and was designated Add 2.
Example 3
The procedure is as in example 1, where the alkalinity source is ammonia, the concentration is 1mol/L, and the solid-to-liquid ratio is 5g/ml, and a synergist sample is obtained and is marked as Add 3.
Example 4
The procedure is as in example 1, wherein the hydrothermal crystallization temperature is 85 ℃ and the hydrothermal crystallization time is 5 hours, and a synergist sample is obtained and is marked as Add 4.
The experimental result of the denitration performance is as follows:
synergist samples were obtained by examples 1-4, labeled in order Add1, Add2, Add3 and Add4, respectively. The fixed bed reaction system is used for carrying out denitration performance evaluation, the sample amount is 2ml, and the volume air-to-air ratio is 60000h-1. The inlet gas contained 500ppm NH3、500ppm NO、6vol％O2The balance gas is nitrogen. The reaction gas is preheated and mixed by the mixed gas, and the total flow is 2L/min. The quartz tube is externally wrapped by a heating furnace, the temperature control range is 200-850 ℃, the concentration of the flue gas at the outlet of the reactor is detected by an infrared analyzer, and the calibration error is less than +/-5%.
Examples 1-4 Denitrification efficiencies at various temperatures are shown in Table 1
TABLE 1
| Examples of the invention | Name (R) | 600℃ | 700℃ | 800℃ | 850℃ | 900℃ |
| Example 1 | Add1 | 15.85 | 22.52 | 31.94 | 35.03 | 23.56 |
| Example 2 | Add2 | 16.81 | 30.02 | 36.22 | 36.92 | 26.68 |
| Example 3 | Add3 | 12.44 | 14.36 | 21.72 | 17.35 | 13.05 |
| Example 4 | Add4 | 4.95 | 8.61 | 13.28 | 15.47 | 7.91 |
Claims (7)
1. A method for preparing an SNCR synergist, which comprises the following steps: stirring raw materials, an alkali source, a seed crystal and water to obtain a mixed solution, and performing hydrothermal crystallization, dehydration, ammonia exchange, washing and calcination to obtain the synergist.
2. The method for preparing SNCR synergist according to claim 1, wherein the raw material is one or a mixture of circulating ash, fly ash and desulfurized ash.
3. The method for preparing an SNCR synergist according to claim 1, wherein the alkali source is one or a mixture of sodium hydroxide and ammonia water, the concentration of the alkali solution is 0.1-5 mol/L, and the solid-to-liquid ratio is 1-10 g/ml.
4. The preparation method of the SNCR synergist according to claim 1, wherein the seed crystal is one or a mixture of HZSM-5 and HSSZ-13, and the dosage of the seed crystal is 0.1-5% of the mass of the raw material.
5. The preparation method of SNCR synergist according to claim 1, wherein the ammonia exchange solution is one or a mixture of ammonium chloride and ammonium sulfate, the concentration of the solution is 0.1-5 mol/L, and the solid-to-liquid ratio is 1-10 g/ml.
6. The SNCR synergist preparation method according to claim 1, wherein the hydrothermal crystallization temperature is 70-95 ℃, and the hydrothermal crystallization time is 3-12 hours; the ammonia exchange temperature is 75-85 ℃, and the time is 0.5-4 hours; the calcination is carried out on line in a high-temperature furnace or a medium-high temperature denitration application, the temperature is 500-950 ℃, and the calcination time is 1-5 hours.
7. Use of a SNCR potentiator according to claim 1, wherein: the synergist is applied to denitration reaction of NOx-containing flue gas at medium-high temperature of 500-950 ℃, and a nitrogen oxide reducing agent adopted in medium-high temperature denitration is one or a mixture of ammonia and urea.
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| CN109879295A (en) * | 2019-04-25 | 2019-06-14 | 太原理工大学 | A kind of ZSM-5 molecular sieve |
| CN110040743A (en) * | 2019-04-25 | 2019-07-23 | 太原理工大学 | A kind of coal ash for manufacturing for SSZ-13 molecular sieve method |
| CN112973415A (en) * | 2021-02-19 | 2021-06-18 | 清华大学 | Cement kiln device and SNCR denitration method |
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- 2021-09-01 CN CN202111020701.8A patent/CN113694958A/en active Pending
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000279751A (en) * | 1999-03-29 | 2000-10-10 | Electric Power Dev Co Ltd | Method and device for denitrating pressure fluidized bed boiler |
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| WO2015149499A1 (en) * | 2014-04-04 | 2015-10-08 | 同济大学 | Low-temperature and highly efficient denitration catalyst and preparation method therefor |
| CN109879295A (en) * | 2019-04-25 | 2019-06-14 | 太原理工大学 | A kind of ZSM-5 molecular sieve |
| CN110040743A (en) * | 2019-04-25 | 2019-07-23 | 太原理工大学 | A kind of coal ash for manufacturing for SSZ-13 molecular sieve method |
| CN112973415A (en) * | 2021-02-19 | 2021-06-18 | 清华大学 | Cement kiln device and SNCR denitration method |
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