CN103623806A - SCR (Selective Catalytic Reduction) honeycombed denitration catalyst production technology - Google Patents
SCR (Selective Catalytic Reduction) honeycombed denitration catalyst production technology Download PDFInfo
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- CN103623806A CN103623806A CN201310435641.5A CN201310435641A CN103623806A CN 103623806 A CN103623806 A CN 103623806A CN 201310435641 A CN201310435641 A CN 201310435641A CN 103623806 A CN103623806 A CN 103623806A
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Abstract
The invention provides an SCR (Selective Catalytic Reduction) honeycombed denitration catalyst production technology. By using the technology, a produced SCR honeycombed denitration catalyst can adapt to the characteristics, that sulphur content and ash content are usually relatively high, of fuel coal used in heat-engine plants of China, nitrogen oxide is controlled efficiently, and the cost of the SCR honeycombed denitration catalyst is reduced. The technology is characterized by orderly comprising the steps of burdening, mixing, pre-extrusion, molding, drying, roasting, machining, assembling and delivering.
Description
Technical field
The present invention relates to SCR (NH
3-SCR) the catalyst manufacture technology field of technology, is specially a kind of SCR honeycomb denitrating catalyst manufacture craft.
Background technology
In recent years, the control of nitrogen oxide is the urgent objective requirement of national economy sustainable development and environmental protection always, in its control technology, and the SCR (NH that the ammonia of take is reducing agent
3-SCR) technology due to mature and reliable in occupation of dominant position.
The coal-fired feature of power plants often sulfur content, ash content is higher, at present, domestic honeycomb catalyst relies on import, the cost of the honeycomb catalyst of import is high, and due to the coal-fired feature of power plants, often sulfur content, ash content are higher, and external honeycomb catalyst is difficult to adapt to China's denitration of boiler smoke performance requirement.
Summary of the invention
For the problems referred to above, the invention provides a kind of SCR honeycomb denitrating catalyst manufacture craft, its SCR honeycomb denitrating catalyst that makes to produce can adapt to the coal-fired feature of power plants often sulfur content, characteristic that ash content is higher, efficient control nitrogen oxide, and the cost of SCR honeycomb denitrating catalyst is reduced.
A SCR honeycomb denitrating catalyst manufacture craft, is characterized in that: it comprises successively batching, mixing, extrudes in advance, moulding, dry, roasting, processing, assembling are dispatched from the factory, and its concrete technology operation is as follows:
1, batching: outsourcing ammonium metavanadate, titanium dioxide, titanium dioxide is unpacked between reinforced and pour in titanium dioxide tank stand-byly, it is that 0.5%～3% ammonium metavanadate solution is stand-by that ammonium metavanadate and water are mixed with to concentration;
2, mix: the titanium dioxide in titanium dioxide tank relies on Action of Gravity Field, by self-measuring device, directly enters mixer; 0.5%～3% ammonium metavanadate solution is squeezed in mixer by pump, the mass ratio of titanium dioxide and ammonium metavanadate solution is 12:1, and add mass ratio is that the PEO that 1.2% hydroxypropyl methylcellulose and mass ratio are 0.7% is mediated as binding agent simultaneously;
3, extrude in advance: mixed material enters filter and filters, remove the larger material of particle, the large granular materials filtering down enters pulverizer and pulverizes rear reuse, and the material after filtration is extruded into former material base by pre-extrusion shaping machine;
4, moulding: the former material base of extruding is in advance extruded into cellular idiosome by extrusion shaping machine again, between extrusion shaping machine when work and material, friction produces amount of heat, need to extrusion shaping machine, carry out with cooling water indirectly cooling, cooling water circulation recycle;
5, dry: cellular idiosome is placed in hothouse and is dried, and the dry steam indirect that adopts, mainly removes a large amount of moisture content in idiosome; It comprises that I level is dry, II level is dry, dry being specially of I level is contained in the catalyst prod after extrusion modling in the fiberboard carton of liner polyurethane sponge, then be placed on the desiccant shelf of I level, the desiccant shelf of I level is advanced in dry I chamber and is dried, the circulating fan of dry I chamber send the air in dry I chamber catalyst prod is dried through the heating of steam heater, to reduce the humidity of catalyst prod and to increase semi-finished product intensity, reach the requirement of demanding party; To from cardboard box, take out through the dried catalyst prod of I level afterwards, be placed on the dry shelf of II level, between catalyst prod, fill out sealing and liner between the dry shelf of the dry level of catalyst prod and II, then advance dry II case to be dried on the dry shelf of II level, the hot gas blower fan of dry II case extracts the air in atmosphere, after steam heater heating, send in dry II case, catalyst prod is carried out further evenly dry, reach the requirement of demanding party, for product roasting provides qualified semi-finished product;
6, roasting: proceed to immediately in tunnel cave dried cellular idiosome is taken out in drying room, by electrical heating, temperature is slowly risen to 700 ℃, in calcination process, ammonium metavanadate can produce ammonia under hot conditions; It is naturally cooling in tunnel cave that calcining finishes rear idiosome; Calcining, naturally cooling whole process need 24 hours;
7, processing: cooled cellular semi-finished product are removed corner by cutting machine, cutting process produces the waste material of cutting by reuse and production after grinder mill powdered;
8, assembling is dispatched from the factory: the product after cutting is finished product after check, assembling, and warehouse-in is prepared outer selling.
It is further characterized in that: the top of described titanium dioxide tank be provided with special reinforced between, described be furnished with sack cleaner between reinforced, processes a small amount of dust producing in reinforced process;
Described mixer top is provided with centrifugal blower, makes that mixer is inner keeps certain negative pressure, and the dust producing when guaranteeing to mix in mixer is not excessive, and a small amount of dust producing in centrifugal blower air draft process is discharge after sack cleaner is processed;
Natural cooling process in described roasting technique needs blast air toward tunnel cave in, and because the particle on idiosome surface can enter in air, so the waste gas producing in tunnel cave, comprises dust and ammonia, after sack cleaner processing by aiutage high altitude discharge;
In drying process, hothouse is got wind and is got wind from the region of tunnel cave, directly extracts hot blast recycling, can make wind-warm syndrome than outdoor get wind high 10 ℃～30 ℃, and the high temperature equipment pipe such as all hot blasts, steam all establishes attemperator, makes surface temperature lower than 50 ℃.
Adopt after the present invention, the performance of SCR honeycomb denitrating catalyst that it obtains and the test of the properties of sample of import like product see the following form:
From this table, under identical denitration efficiency, SCR honeycomb denitrating catalyst superior performance, have more abrasion resistance, can extend more than 20% service life, therefore the SCR honeycomb denitrating catalyst that technique provided by the present invention makes to produce can adapt to the coal-fired feature of power plants often sulfur content, characteristic that ash content is higher, efficiently control nitrogen oxide, and the cost of SCR honeycomb denitrating catalyst is reduced.
The specific embodiment
A SCR honeycomb denitrating catalyst manufacture craft, it comprises successively batching, mixing, extrudes in advance, moulding, dry, roasting, processing, assembling are dispatched from the factory, its concrete technology operation is as follows:
1, batching: outsourcing ammonium metavanadate, titanium dioxide, titanium dioxide is unpacked between reinforced and pour in titanium dioxide tank stand-byly, it is that 0.5%～3% ammonium metavanadate solution is stand-by that ammonium metavanadate and water are mixed with to concentration; The top of titanium dioxide tank be provided with special reinforced between, be furnished with sack cleaner between reinforced, process a small amount of dust producing in reinforced process;
2, mix: the titanium dioxide in titanium dioxide tank relies on Action of Gravity Field, by self-measuring device, directly enters mixer; 0.5%～3% ammonium metavanadate solution is squeezed in mixer by pump, the mass ratio of titanium dioxide and ammonium metavanadate solution is 12:1, and add mass ratio is that the PEO that 1.2% hydroxypropyl methylcellulose and mass ratio are 0.7% is mediated as binding agent simultaneously; Mixer top is provided with centrifugal blower, makes that mixer is inner keeps certain negative pressure, and the dust producing when guaranteeing to mix in mixer is not excessive, and a small amount of dust producing in centrifugal blower air draft process is discharge after sack cleaner is processed;
3, extrude in advance: mixed material enters filter and filters, remove the larger material of particle, the large granular materials filtering down enters pulverizer and pulverizes rear reuse, and the material after filtration is extruded into former material base by pre-extrusion shaping machine;
4, moulding: the former material base of extruding is in advance extruded into cellular idiosome by extrusion shaping machine again, between extrusion shaping machine when work and material, friction produces amount of heat, need to extrusion shaping machine, carry out with cooling water indirectly cooling, cooling water circulation recycle;
5, dry: cellular idiosome is placed in hothouse and is dried, and the dry steam indirect that adopts, mainly removes a large amount of moisture content in idiosome, it comprises that I level is dry, II level is dry, I level is dry to be specially extruding, catalyst prod after aging is contained in the fiberboard carton of liner polyurethane sponge, then be placed on the desiccant shelf of I level, the desiccant shelf of I level is advanced in dry I chamber and is dried, the circulating fan of dry I chamber send the air in dry I chamber catalyst prod is dried through the heating of steam heater, to reduce the humidity of catalyst prod and to increase semi-finished product intensity, reach the requirement of demanding party, each hothouse is of a size of L12.7 M x W4.32 M x H2.2M, amount to 16, to from cardboard box, take out through the dried catalyst prod of I level afterwards, be placed on the dry shelf of II level, between catalyst prod, fill out sealing and liner between the dry shelf of the dry level of catalyst prod and II, then advance dry II case to be dried on the dry shelf of II level, the hot gas blower fan of dry II case extracts the air in atmosphere, after steam heater heating, send in dry II case, catalyst prod is carried out further evenly dry, reach the requirement of demanding party, for product roasting provides qualified semi-finished product, quantity is 9, steam consumption is 1.5t/h, and condensed water is delivered to You Lian power plant oxygen-eliminating device and recycled, after heat exchanger drain recovery, be recovered in hold-up tank, for the mixing of material, thereby further reduce energy consumption,
6, roasting: proceed to immediately in tunnel cave dried cellular idiosome is taken out in drying room, by electrical heating, temperature is slowly risen to 700 ℃, in calcination process, ammonium metavanadate can produce ammonia under hot conditions; Reaction equation is as follows:
2NH
4VO
3 →2NH
3↑+ V
2O
5+H
2O；
It is naturally cooling in tunnel cave that calcining finishes rear idiosome; Calcining, naturally cooling whole process need 24 hours, natural cooling process in roasting technique needs to blast air in tunnel cave, and because the particle on idiosome surface can enter in air, therefore the waste gas producing in tunnel cave, comprise dust and ammonia, after sack cleaner is processed by aiutage high altitude discharge;
7, processing: cooled cellular semi-finished product are removed corner by cutting machine, cutting process produces the waste material of cutting by reuse and production after grinder mill powdered;
8, assembling is dispatched from the factory: the product after cutting is finished product after check, assembling, and warehouse-in is prepared outer selling.
In drying process, hothouse is got wind and is got wind from the region of tunnel cave, directly extracts hot blast recycling, can make wind-warm syndrome than outdoor get wind high 10 ℃～30 ℃, and the high temperature equipment pipes such as all hot blasts, steam are all established attemperator, make surface temperature lower than 50 ℃, and it can effectively save the energy.
The equipment of whole technique has been taked following conservation measures:
(1) mixer adopts imported product, and equipment adopts double speed to drive, and while slowly running, can greatly reduce energy consumption;
(2) extruder adopts variable frequency adjustment to drive, and energy consumption can be according to exerting oneself different and corresponding adjusting;
(3) adopt low energy consumption type screw air compressor;
(4) main with in energy equipment, sintering of catalyst stove is energy equipment for emphasis.This project is selected electrical heating mesh belt type tunnel cave, is provided with five critical systems such as kiln body steelframe and fire-resistant/heat-insulation system, guipure transmission system, electric heating system, ventilation system, automatically detect/control system of temperature and material sample tap/peep hole and kiln firebreak structure in kiln.Supporting each system introduction of stove is as follows:
A. frame structure
Body of heater length be take 2m as unit modulus, adopts shaped steel (square steel tube and other shaped steel) to make skeleton, and pure frame unit mounting structure, can directly be placed on the terrace of workshop.The driving member of kiln passes on steelframe by connector; Kiln top weight acts on the girder steel of kiln top by suspender member, and kiln bottom covers corrugated steel plate, and kiln side wall and kiln bottom weight arrive kiln base cross members by the even power transmission of corrugated sheet, and total reasonable stress is simple for structure.
Exterior trim panel adopts cold-rolling steel-plate punch to become louver structure, is convenient to heat radiation.
B. masonry, flame-proof thermal insulation material
Stove adopts full fiber folded piece inner lining structure, can in cold conditions situation, directly start kiln, must control lifting/lowering temperature speed compare with traditional structure, and fully fibrous structure has saved the baker program before newly-built stove uses, thereby has saved the energy consumption of baker process; This inner lining structure selects pyroceram fibre to make, there is the advantages such as heatproof is high, lightweight, thermal conductivity factor is low, accumulation of heat is little, thermal shock resistance is good, energy automatic absorption swelling stress, the most obvious advantage is energy-efficient performance, because the thermal conductivity factor of ceramic fibre low (be equivalent to common fireproof insulation brick 1/10th), accumulation of heat are little, can greatly reduce dissipated heat.
Claims (5)
1. a SCR honeycomb denitrating catalyst manufacture craft, is characterized in that: it comprises successively batching, mixing, extrudes in advance, moulding, dry, roasting, processing, assembling are dispatched from the factory, and its concrete technology operation is as follows:
A, batching: outsourcing ammonium metavanadate, titanium dioxide, titanium dioxide is unpacked between reinforced and pour in titanium dioxide tank stand-byly, it is that 0.5%～3% ammonium metavanadate solution is stand-by that ammonium metavanadate and water are mixed with to concentration;
B, mixing: the titanium dioxide in titanium dioxide tank relies on Action of Gravity Field, by self-measuring device, directly enters mixer; 0.5%～3% ammonium metavanadate solution is squeezed in mixer by pump, the mass ratio of titanium dioxide and ammonium metavanadate solution is 12:1, and add mass ratio is that the PEO that 1.2% hydroxypropyl methylcellulose and mass ratio are 0.7% is mediated as binding agent simultaneously;
C, extrude in advance: mixed material enters filter and filters, remove the larger material of particle, the large granular materials filtering down enters pulverizer pulverize after reuse, the material after filtration is extruded into former material base by pre-extrusion shaping machine;
D, moulding: the former material base of extruding is in advance extruded into cellular idiosome by extrusion shaping machine again, between extrusion shaping machine when work and material, friction produces amount of heat, need to extrusion shaping machine, carry out with cooling water indirectly cooling, cooling water circulation recycle;
E, dry: cellular idiosome is placed in hothouse and is dried, and the dry steam indirect that adopts, mainly removes a large amount of moisture content in idiosome; It comprises that I level is dry, II level is dry, dry being specially of I level is contained in the catalyst prod after extrusion modling in the fiberboard carton of liner polyurethane sponge, then be placed on the desiccant shelf of I level, the desiccant shelf of I level is advanced in dry I chamber and is dried, the circulating fan of dry I chamber send the air in dry I chamber catalyst prod is dried through the heating of steam heater, to reduce the humidity of catalyst prod and to increase semi-finished product intensity, reach the requirement of demanding party; To from cardboard box, take out through the dried catalyst prod of I level afterwards, be placed on the dry shelf of II level, between catalyst prod, fill out sealing and liner between the dry shelf of the dry level of catalyst prod and II, then advance dry II case to be dried on the dry shelf of II level, the hot gas blower fan of dry II case extracts the air in atmosphere, after steam heater heating, send in dry II case, catalyst prod is carried out further evenly dry, reach the requirement of demanding party, for product roasting provides qualified semi-finished product;
F, roasting: dried cellular idiosome is taken out in drying room, proceed to immediately in tunnel cave, by electrical heating, temperature is slowly risen to 700 ℃, in calcination process, ammonium metavanadate can produce ammonia under hot conditions; It is naturally cooling in tunnel cave that calcining finishes rear idiosome; Calcining, naturally cooling whole process need 24 hours;
G, processing: cooled cellular semi-finished product are removed corner by cutting machine, cutting process produces the waste material of cutting by reuse and production after grinder mill powdered;
H, assembling are dispatched from the factory: the product after cutting is finished product after check, assembling, and warehouse-in is prepared outer selling.
2. a kind of SCR honeycomb denitrating catalyst manufacture craft according to claim 1, is characterized in that: the top of described titanium dioxide tank be provided with special reinforced between, described be furnished with sack cleaner between reinforced, processes a small amount of dust producing in reinforced process.
3. a kind of SCR honeycomb denitrating catalyst manufacture craft according to claim 1; it is characterized in that: described mixer top is provided with centrifugal blower; make the certain negative pressure of the inner maintenance of mixer; the dust producing when guaranteeing to mix in mixer is not excessive, and a small amount of dust producing in centrifugal blower air draft process is discharge after sack cleaner is processed.
4. a kind of SCR honeycomb denitrating catalyst manufacture craft according to claim 1, it is characterized in that: the natural cooling process needs in described roasting technique blast air in tunnel cave, and because the particle on idiosome surface can enter in air, therefore the waste gas producing in tunnel cave, comprise dust and ammonia, after sack cleaner is processed by aiutage high altitude discharge.
5. a kind of SCR honeycomb denitrating catalyst manufacture craft according to claim 4, it is characterized in that: in drying process, hothouse is got wind and is got wind from the region of tunnel cave, directly extract hot blast recycling, can make wind-warm syndrome than outdoor get wind high 10 ℃～30 ℃, and the high temperature equipment pipes such as all hot blasts, steam are all established attemperator, make surface temperature lower than 50 ℃.
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106040315A (en) * | 2016-06-23 | 2016-10-26 | 无锡华光新动力环保科技股份有限公司 | Drying process for cooperating denitration and demercuration catalyst of flue gas coal-fired power plant |
| CN107365459A (en) * | 2017-09-05 | 2017-11-21 | 东莞市诺西威工程塑料有限公司 | A kind of preparation technology and device of AFPS materials, and its application |
| CN108187657A (en) * | 2018-01-10 | 2018-06-22 | 北京国电龙源环保工程有限公司 | Thin-walled SCR denitration of low oxidation rate of sulfur dioxide and preparation method thereof |
| CN108187658A (en) * | 2018-01-10 | 2018-06-22 | 北京国电龙源环保工程有限公司 | 50 hole SCR denitration modules and preparation method thereof |
| CN108283921A (en) * | 2018-01-10 | 2018-07-17 | 北京国电龙源环保工程有限公司 | 60 hole SCR denitration modules and preparation method thereof |
| CN108927145A (en) * | 2018-06-11 | 2018-12-04 | 白茹 | A kind of preparation method of catalyst for denitrating flue gas |
| CN114832807A (en) * | 2022-06-02 | 2022-08-02 | 东方凯特瑞(成都)环保科技有限公司 | SCR denitration catalyst and preparation method thereof |
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| CN102974340A (en) * | 2012-11-22 | 2013-03-20 | 中节能六合天融环保科技有限公司 | Preparation method of cellular V-Ti low-temperature smoke denitration catalyst |
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| WO2007065370A1 (en) * | 2005-12-08 | 2007-06-14 | The Hong Kong University Of Science And Technology | Low temperature ammonia remediation catalysts |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106040315A (en) * | 2016-06-23 | 2016-10-26 | 无锡华光新动力环保科技股份有限公司 | Drying process for cooperating denitration and demercuration catalyst of flue gas coal-fired power plant |
| CN107365459A (en) * | 2017-09-05 | 2017-11-21 | 东莞市诺西威工程塑料有限公司 | A kind of preparation technology and device of AFPS materials, and its application |
| CN108187657A (en) * | 2018-01-10 | 2018-06-22 | 北京国电龙源环保工程有限公司 | Thin-walled SCR denitration of low oxidation rate of sulfur dioxide and preparation method thereof |
| CN108187658A (en) * | 2018-01-10 | 2018-06-22 | 北京国电龙源环保工程有限公司 | 50 hole SCR denitration modules and preparation method thereof |
| CN108283921A (en) * | 2018-01-10 | 2018-07-17 | 北京国电龙源环保工程有限公司 | 60 hole SCR denitration modules and preparation method thereof |
| CN108927145A (en) * | 2018-06-11 | 2018-12-04 | 白茹 | A kind of preparation method of catalyst for denitrating flue gas |
| CN108927145B (en) * | 2018-06-11 | 2021-06-25 | 安徽佳环重工机械有限公司 | Preparation method of flue gas denitration catalyst |
| CN114832807A (en) * | 2022-06-02 | 2022-08-02 | 东方凯特瑞(成都)环保科技有限公司 | SCR denitration catalyst and preparation method thereof |
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