CN104190405A - Mixing process of SCR honeycomb denitration catalyst - Google Patents
Mixing process of SCR honeycomb denitration catalyst Download PDFInfo
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Abstract
The invention discloses a mixing process of an SCR honeycomb denitration catalyst. The process comprises the following five steps: preparing raw materials, stirring main ingredients at a low temperature, stirring at a high temperature while regulating the moisture content and pH value, stirring auxiliary materials at a low temperature while controlling the moisture content and pH value, and stirring at a high temperature while regulating the moisture content and pH value, thereby finally obtaining a mixture of the SCR honeycomb denitration catalyst. In the mixing process, a sectional stirring mode is adopted, the low-temperature stirring and high-temperature stirring are used in an alternative mode, and the curing temperature, moisture content and pH value of the mixture are controlled, so that the plasticity of the obtained mixture is guaranteed and reaches 250-300, the stirring period is greatly shortened, the yield is improved, the mixture of the honeycomb catalyst is effectively prevented from cracking in the subsequent drying and calcining process, and the compressive strength and wear resistance of a finished product are improved.
Description
Technical field
The invention belongs to catalyst technical field, relate to a kind of calendering process of SCR honeycomb denitrating catalyst.
Background technology
Nitrogen oxide (NO
x) be one of main atmosphere pollution, comprise NO, NO
2etc. multiple nitrogen oxide, to health and animals and plants existence, all can cause certain injury, as formed acid rain, photochemical fog etc., but also can produce multiple secondary pollution.In environmental consciousness with require more and more stronger today, the discharge of how to remove nitrogen oxide, becomes more and more urgent problem.At present, the nitrogen oxide of China mainly produces from coal combustion and industrial smog discharge, legacy cellular denitrating catalyst TiO
2make carrier, V
2o
5make active component, WO
3make heat stabilizer, then add some shaping assistants, by wet mixing, in mixer, stir.
Application number is that 201110056859.0 Chinese patent discloses a kind of catalytic agent for denitrating smoke and preparation technology thereof, just simply by mixing such as titanium dioxide, tungstic acid, vanadic anhydride, organic binder bond, glass fibres, add again water, plasticizer etc. to stir, this technique mixing time is long, honeycomb catalyst easy cracking in follow-up dry, calcination process simultaneously, yield rate is low, cause the mechanical performance of catalyst simultaneously, as compression strength and wear-resistant loss rate deficiency, cannot meet the service life of 24000h.
Summary of the invention
Technical problem to be solved by this invention is just to provide a kind of calendering process of SCR honeycomb denitrating catalyst, mixing cycle can be shortened, improve yield rate, effectively prevent the cracking of honeycomb catalyst in follow-up dry, calcination process, improve compression strength and the wear resistance of finished product simultaneously.
For solving the problems of the technologies described above, the present invention adopts following technical scheme: a kind of calendering process of SCR honeycomb denitrating catalyst, comprises the following steps:
Step 1: prepare respectively by weight following raw material: titanium dioxide 50～80 weight portions, tungstic acid 5～10 weight portions, silica flour 3～5 weight portions, ammoniacal liquor 7～15 weight portions, water 15～35 weight portions, lubricant 3～6 weight portions, ammonium metavanadate aqueous solution 10～15 weight portions, plasticizer 3～6 weight portions, binding agent 15～25 weight portions; Wherein, lubricant is glycerine or triethanolamine, and plasticizer is dioctyl phthalate (DOP) or dibutyl phthalate (DBP), and binding agent is one or both in polyvinyl alcohol, carboxylic propyl methocel;
Step 2: titanium dioxide, tungstic acid, silica flour are added in mixer and stirred successively, and mixing speed is 80～120r/min, and mixing time is 10～15min; First adopting low temperature to stir stirs the major ingredients such as titanium dioxide, tungstic acid, silica flour.
Step 3: add successively lubricant, continue to stir, mixing speed is 400～600r/min, mixing time is 5～10min, then adds a part of water, regulates water content to 36～38%, then add a part of ammoniacal liquor to regulate pH value to 8～9, system temperature is 40～60 ℃; Add water and ammoniacal liquor to distinguish water content and the pH value of regulation system, and be warming up to uniform temperature, coordinate high-speed stirred, be conducive to the mixing of raw material.
Step 4: add successively ammonium metavanadate aqueous solution, plasticizer, binding agent, continue to stir, mixing speed is 80～120r/min, and mixing time is 5～10min, regulates water content to 40～45%, and system temperature is 50～55 ℃; Again adopt low temperature to stir, the auxiliary materials such as ammonium metavanadate aqueous solution, plasticizer, binding agent are stirred together with major ingredient, and strictly control water content and temperature, the plasticity that is conducive to mixing materials is improved, the cracking of the mixing materials that effectively prevents honeycomb catalyst in follow-up dry, calcination process, improves yield rate.
Step 5: open air bleeding valve, continue to stir, mixing speed is 400～600r/min, mixing time is 25～30min, then the ammoniacal liquor and the water that add surplus, regulating water content is that 30～35%, pH value is 7～8, and temperature is controlled to 85～90 ℃, obtain the mixing materials of SCR honeycomb denitrating catalyst.Again adopt high-temperature stirring, and control curing temperature and the water content of mixing materials, by adding the pH value of ammoniacal liquor regulation system, finally obtain the mixing materials of excellent performance.
Preferably, add a part of ammoniacal liquor to regulate pH value to 8.2 in step 3, system temperature is 45～48 ℃.PH value is 8.2, temperature is while approaching 48 ℃, and the time of high-temperature stirring can shorten to 5min left and right, and the effect of lubricant can reach more satisfactory state.
Preferably, regulate water content to 40～42% in step 4, system temperature is 50～53 ℃.Water content approaches 42%, temperature is while approaching 53 ℃, and the pore producing in follow-up dry, the calcination process of mixing materials is not easy to stop up, and is more conducive to improve the catalytic effect of catalyst finished product.
Preferably, in step 5, regulating water content is that 30～32%, pH value is 7.7, and temperature is controlled to 85～88 ℃.Water content approaches 32%, pH value is 7.7, temperature is while approaching 88 ℃, and except mixing materials is produced the finished product compression strength that obtains and wear resistance obviously improve, and mixing materials discharging is easier, heels still less, reduce clout waste, and time saving and energy saving, reduce labor intensity.
Compared with prior art, advantage of the present invention is: in mixing process, the mode that adopts segmentation to stir, low temperature stirs and high-temperature stirring cross-reference, control curing temperature, water content, the pH value of mixing materials, thereby guarantee the plasticity of mixing materials, make the mixing materials plasticity obtaining reach 250～300, greatly shorten mixing cycle simultaneously, improve yield rate, the cracking of the mixing materials that effectively prevents honeycomb catalyst in follow-up dry, calcination process improves compression strength and the wear resistance of finished product simultaneously.
Below in conjunction with the specific embodiment, the invention will be further described:
The specific embodiment
The calendering process embodiment 1 of a kind of SCR honeycomb of the present invention denitrating catalyst, comprises the following steps:
Step 1: prepare respectively by weight following raw material: titanium dioxide 50～80 weight portions, tungstic acid 5～10 weight portions, silica flour 3～5 weight portions, ammoniacal liquor 7～15 weight portions, water 15～35 weight portions, lubricant 3～6 weight portions, ammonium metavanadate aqueous solution 10～15 weight portions, plasticizer 3～6 weight portions, binding agent 15～25 weight portions; Wherein, lubricant is glycerine or triethanolamine, and plasticizer is dioctyl phthalate (DOP) or dibutyl phthalate (DBP), and binding agent is one or both in polyvinyl alcohol, carboxylic propyl methocel;
Step 2: titanium dioxide, tungstic acid, silica flour are added in mixer and stirred successively, and mixing speed is 100r/min, and mixing time is 15min; First adopting low temperature to stir stirs the major ingredients such as titanium dioxide, tungstic acid, silica flour.
Step 3: add successively lubricant, continue to stir, mixing speed is 500r/min, and mixing time is 10min, then adds a part of water, regulates water content to 36～38%, then adds a part of ammoniacal liquor to regulate pH value to 9, and system temperature is 40～45 ℃; Add water and ammoniacal liquor to distinguish water content and the pH value of regulation system, and be warming up to uniform temperature, coordinate high-speed stirred, be conducive to the mixing of raw material.
Step 4: add successively ammonium metavanadate aqueous solution, plasticizer, binding agent, continue to stir, mixing speed is 100r/min, and mixing time is 10min, regulates water content to 40～45%, and system temperature is 50～55 ℃; Again adopt low temperature to stir, the auxiliary materials such as ammonium metavanadate aqueous solution, plasticizer, binding agent are stirred together with major ingredient, and strictly control water content and temperature, the plasticity that is conducive to mixing materials is improved, the cracking of the mixing materials that effectively prevents honeycomb catalyst in follow-up dry, calcination process, improves yield rate.
Step 5: open air bleeding valve, continue to stir, mixing speed is 500r/min, mixing time is 30min, then adds ammoniacal liquor and the water of surplus, and regulating water content is 30～35%, pH value is 7, and temperature is controlled to 85～90 ℃, obtains the mixing materials of SCR honeycomb denitrating catalyst.Again adopt high-temperature stirring, and control curing temperature and the water content of mixing materials, by adding the pH value of ammoniacal liquor regulation system, finally obtain the mixing materials of excellent performance, the plasticity that guarantees mixing materials can reach 250～300, than prior art, be significantly improved, prior art plasticity can only reach 150～200.
The calendering process embodiment 2 of a kind of SCR honeycomb of the present invention denitrating catalyst, comprises the following steps:
Step 1: prepare respectively by weight following raw material: titanium dioxide 50～80 weight portions, tungstic acid 5～10 weight portions, silica flour 3～5 weight portions, ammoniacal liquor 7～15 weight portions, water 15～35 weight portions, lubricant 3～6 weight portions, ammonium metavanadate aqueous solution 10～15 weight portions, plasticizer 3～6 weight portions, binding agent 15～25 weight portions; Wherein, lubricant is glycerine or triethanolamine, and plasticizer is dioctyl phthalate (DOP) or dibutyl phthalate (DBP), and binding agent is one or both in polyvinyl alcohol, carboxylic propyl methocel;
Step 2: titanium dioxide, tungstic acid, silica flour are added in mixer and stirred successively, and mixing speed is 120r/min, and mixing time is 10min;
Step 3: add successively lubricant, continue to stir, mixing speed is 450r/min, and mixing time is 5min, then adds a part of water, regulates water content to 36～38%, then adds a part of ammoniacal liquor to regulate pH value to 8.2, and system temperature is 45～48 ℃; PH value is 8.2, temperature is while approaching 48 ℃, and the time of high-temperature stirring can shorten to 5min left and right, and the effect of lubricant can reach more satisfactory state.
Step 4: add successively ammonium metavanadate aqueous solution, plasticizer, binding agent, continue to stir, mixing speed is 80r/min, and mixing time is 10min, regulates water content to 40～45%, and system temperature is 50～55 ℃;
Step 5: open air bleeding valve, continue to stir, mixing speed is 550r/min, and mixing time is 25min, then adds ammoniacal liquor and the water of surplus, regulating water content is 30～35%, pH value is 8, and temperature is controlled to 85～90 ℃, obtains the mixing materials of SCR honeycomb denitrating catalyst, the plasticity that guarantees mixing materials can reach 250～300, than prior art, is significantly improved.
The calendering process embodiment 3 of a kind of SCR honeycomb of the present invention denitrating catalyst, comprises the following steps:
Step 1: prepare respectively by weight following raw material: titanium dioxide 50～80 weight portions, tungstic acid 5～10 weight portions, silica flour 3～5 weight portions, ammoniacal liquor 7～15 weight portions, water 15～35 weight portions, lubricant 3～6 weight portions, ammonium metavanadate aqueous solution 10～15 weight portions, plasticizer 3～6 weight portions, binding agent 15～25 weight portions; Wherein, lubricant is glycerine or triethanolamine, and plasticizer is dioctyl phthalate (DOP) or dibutyl phthalate (DBP), and binding agent is one or both in polyvinyl alcohol, carboxylic propyl methocel;
Step 2: titanium dioxide, tungstic acid, silica flour are added in mixer and stirred successively, and mixing speed is 80r/min, and mixing time is 15min;
Step 3: add successively lubricant, continue to stir, mixing speed is 500r/min, and mixing time is 10min, then adds a part of water, regulates water content to 36～38%, then adds a part of ammoniacal liquor to regulate pH value to 8.5, and system temperature is 50～55 ℃;
Step 4: add successively ammonium metavanadate aqueous solution, plasticizer, binding agent, continue to stir, mixing speed is 120r/min, and mixing time is 5min, regulates water content to 40～42%, and system temperature is 50～53 ℃; Water content approaches 42%, temperature is while approaching 53 ℃, and the pore producing in follow-up dry, the calcination process of mixing materials is not easy to stop up, and is more conducive to improve the catalytic effect of catalyst finished product.
Step 5: open air bleeding valve, continue to stir, mixing speed is 400r/min, and mixing time is 30min, then adds ammoniacal liquor and the water of surplus, regulating water content is 30～35%, pH value is 8, and temperature is controlled to 85～90 ℃, obtains the mixing materials of SCR honeycomb denitrating catalyst, the plasticity that guarantees mixing materials can reach 250～300, than prior art, is significantly improved.
The calendering process embodiment 4 of a kind of SCR honeycomb of the present invention denitrating catalyst, comprises the following steps:
Step 1: prepare respectively by weight following raw material: titanium dioxide 50～80 weight portions, tungstic acid 5～10 weight portions, silica flour 3～5 weight portions, ammoniacal liquor 7～15 weight portions, water 15～35 weight portions, lubricant 3～6 weight portions, ammonium metavanadate aqueous solution 10～15 weight portions, plasticizer 3～6 weight portions, binding agent 15～25 weight portions; Wherein, lubricant is glycerine or triethanolamine, and plasticizer is dioctyl phthalate (DOP) or dibutyl phthalate (DBP), and binding agent is one or both in polyvinyl alcohol, carboxylic propyl methocel;
Step 2: titanium dioxide, tungstic acid, silica flour are added in mixer and stirred successively, and mixing speed is 100r/min, and mixing time is 10min;
Step 3: add successively lubricant, continue to stir, mixing speed is 500r/min, and mixing time is 5min, then adds a part of water, regulates water content to 36～38%, then adds a part of ammoniacal liquor to regulate pH value to 8.2, and system temperature is 45～48 ℃;
Step 4: add successively ammonium metavanadate aqueous solution, plasticizer, binding agent, continue to stir, mixing speed is 100r/min, and mixing time is 10min, regulates water content to 40～42%, and system temperature is 50～53 ℃;
Step 5: open air bleeding valve, continue to stir, mixing speed is 500r/min, mixing time is 25min, then adds ammoniacal liquor and the water of surplus, and regulating water content is 30～32%, pH value is 7.7, and temperature is controlled to 85～88 ℃, obtains the mixing materials of SCR honeycomb denitrating catalyst.Water content approaches 32%, pH value is 7.7, temperature is while approaching 88 ℃, except mixing materials is produced the finished product compression strength and the obvious raising of wear resistance obtaining, and mixing materials discharging is easier, heels still less, reduce clout waste, and time saving and energy saving, reduce labor intensity, and the plasticity of resulting mixing materials can reach 250～300, than prior art, be significantly improved.
The foregoing is only specific embodiments of the invention, but technical characterictic of the present invention is not limited to this, any those skilled in the art is in the field of the invention, and the variation of doing or modification are all encompassed among the scope of the claims of the present invention.
Claims (4)
1. a calendering process for SCR honeycomb denitrating catalyst, is characterized in that: comprise the following steps:
Step 1: prepare respectively by weight following raw material: titanium dioxide 50～80 weight portions, tungstic acid 5～10 weight portions, silica flour 3～5 weight portions, ammoniacal liquor 7～15 weight portions, water 15～35 weight portions, lubricant 3～6 weight portions, ammonium metavanadate aqueous solution 10～15 weight portions, plasticizer 3～6 weight portions, binding agent 15～25 weight portions; Wherein, lubricant is glycerine or triethanolamine, and plasticizer is dioctyl phthalate or dibutyl phthalate, and binding agent is one or both in polyvinyl alcohol, carboxylic propyl methocel;
Step 2: titanium dioxide, tungstic acid, silica flour are added in mixer and stirred successively, and mixing speed is 80～120r/min, and mixing time is 10～15min;
Step 3: add successively lubricant, continue to stir, mixing speed is 400～600r/min, mixing time is 5～10min, then adds a part of water, regulates water content to 36～38%, then add a part of ammoniacal liquor to regulate pH value to 8～9, system temperature is 40～60 ℃;
Step 4: add successively ammonium metavanadate aqueous solution, plasticizer, binding agent, continue to stir, mixing speed is 80～120r/min, and mixing time is 5～10min, regulates water content to 40～45%, and system temperature is 50～55 ℃;
Step 5: open air bleeding valve, continue to stir, mixing speed is 400～600r/min, mixing time is 25～30min, then the ammoniacal liquor and the water that add surplus, regulating water content is that 30～35%, pH value is 7～8, and temperature is controlled to 85～90 ℃, obtain the mixing materials of SCR honeycomb denitrating catalyst.
2. the calendering process of a kind of SCR honeycomb denitrating catalyst as claimed in claim 1, is characterized in that: in step 3, add a part of ammoniacal liquor to regulate pH value to 8.2, system temperature is 45～48 ℃.
3. the calendering process of a kind of SCR honeycomb denitrating catalyst as claimed in claim 1, is characterized in that: in step 4, regulate water content to 40～42%, system temperature is 50～53 ℃.
4. the calendering process of a kind of SCR honeycomb denitrating catalyst as claimed in claim 1, is characterized in that: in step 5, regulating water content is that 30～32%, pH value is 7.7, and temperature is controlled to 85～88 ℃.
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