CN103623806B - 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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- CN103623806B CN103623806B CN201310435641.5A CN201310435641A CN103623806B CN 103623806 B CN103623806 B CN 103623806B CN 201310435641 A CN201310435641 A CN 201310435641A CN 103623806 B CN103623806 B CN 103623806B
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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, be 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, take ammonia as the SCR (NH of 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, national cellular 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, it makes the SCR honeycomb denitrating catalyst produced 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 kind of SCR honeycomb denitrating catalyst manufacture craft, is characterized in that: it comprises batching successively, mixing, pre-extruded, shaping, dry, roasting, processing, assembling are dispatched from the factory, and its concrete technology operates as follows:
1, prepare burden: outsourcing ammonium metavanadate, titanium dioxide, titanium dioxide is unpacked between reinforced pour in titanium dioxide tank stand-by, ammonium metavanadate and water are mixed with concentration be 0.5% ~ 3% ammonium metavanadate solution stand-by;
2, mix: the titanium dioxide in titanium dioxide tank relies on Action of Gravity Field, directly enters mixer by self-measuring device; The ammonium metavanadate solution of 0.5% ~ 3% is squeezed in mixer by pump, the mass ratio of titanium dioxide and ammonium metavanadate solution is 12:1, add simultaneously mass ratio be 1.2% hydroxypropyl methylcellulose and mass ratio be 0.7% PEO mediate as binding agent;
3, pre-extruded: mixed material enters filter and filters, removes the material that particle is larger, and the large granular materials filtered down enters pulverizer and pulverizes rear reuse, and the material after filtration is extruded into raw material base by pre-extruded forming machine;
4, shaping: the raw material base of pre-extruded is extruded into cellular idiosome by extrusion shaping machine again, rub during extrusion shaping machine work and between material and produce amount of heat, need indirectly to cool extrusion shaping machine with cooling water, cooling water circulation recycle;
5, dry: cellular idiosome to be placed in hothouse and to carry out drying, dry employing steam indirect, a large amount of moisture content in main removal idiosome; It comprises I grade of drying, II grade of drying, I grade of drying is specially and is contained in the fiberboard carton of liner polyurethane sponge by the catalyst prod after extruded, then be placed on I grade of desiccant shelf, I grade of desiccant shelf is advanced in dry I Room and carries out drying, air in dry I Room send through the heating of steam heater and carries out drying to catalyst prod by the circulating fan of dry I Room, to reduce the humidity of catalyst prod and to increase semi-finished product intensity, reach the requirement of demanding party; To take out from cardboard box through I grade of dried catalyst prod afterwards, be placed on II grade of dry shelf, sealing and liner is filled out between catalyst prod, between catalyst prod and the dry shelf of II dry level, then II grade of dry shelf is advanced and carry out drying dry II case, the hot gas blower fan of dry II case extracts the air in air, send in dry II case after steam heater heating, catalyst prod is carried out evenly dry further, reach the requirement of demanding party, for product roasting provides qualified semi-finished product;
6, roasting: proceed to immediately in tunnel cave after being taken out in drying room by dried cellular idiosome, by electrical heating, temperature is slowly risen to 700 DEG C, in calcination process, ammonium metavanadate can produce ammonia under the high temperature conditions; Calcining terminates rear idiosome and naturally cools in tunnel cave; Calcine, naturally cool whole process need 24 hours;
7, process: cooled cellular semi-finished product remove 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 inspection, assembling, and warehouse-in prepares outer selling.
It is further characterized in that: the top of described titanium dioxide tank be provided with special reinforced between, described reinforced between be furnished with sack cleaner, a small amount of dust produced in the reinforced process of process;
Described mixer top is provided with centrifugal blower, and make mixer inside keep certain negative pressure, the dust produced during to guarantee to mix in mixer is not excessive, and a small amount of dust produced in centrifugal blower air draft process discharges after sack cleaner process;
Natural cooling process in described roasting technique needs to blast air toward tunnel cave in, and can enter in air due to the particle on idiosome surface, and the waste gas of therefore generation in tunnel cave, comprises dust and ammonia, by aiutage high altitude discharge after sack cleaner process;
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 DEG C ~ 30 DEG C, and the high temperature equipment pipes such as all hot blasts, steam all establish attemperator, make surface temperature lower than 50 DEG C.
After adopting the present invention, the performance of the SCR honeycomb denitrating catalyst that it obtains and the properties of sample test 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, service life can extend more than 20%, therefore technique provided by the present invention makes the SCR honeycomb denitrating catalyst produced 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.
Detailed description of the invention
A kind of SCR honeycomb denitrating catalyst manufacture craft, it comprises batching successively, mixing, pre-extruded, shaping, dry, roasting, processing, assembling are dispatched from the factory, and its concrete technology operates as follows:
1, prepare burden: outsourcing ammonium metavanadate, titanium dioxide, titanium dioxide is unpacked between reinforced pour in titanium dioxide tank stand-by, ammonium metavanadate and water are mixed with concentration be 0.5% ~ 3% ammonium metavanadate solution stand-by; The top of titanium dioxide tank be provided with special reinforced between, be furnished with sack cleaner between reinforced, a small amount of dust produced in the reinforced process of process;
2, mix: the titanium dioxide in titanium dioxide tank relies on Action of Gravity Field, directly enters mixer by self-measuring device; The ammonium metavanadate solution of 0.5% ~ 3% is squeezed in mixer by pump, the mass ratio of titanium dioxide and ammonium metavanadate solution is 12:1, add simultaneously mass ratio be 1.2% hydroxypropyl methylcellulose and mass ratio be 0.7% PEO mediate as binding agent; Mixer top is provided with centrifugal blower, and make mixer inside keep certain negative pressure, the dust produced during to guarantee to mix in mixer is not excessive, and a small amount of dust produced in centrifugal blower air draft process discharges after sack cleaner process;
3, pre-extruded: mixed material enters filter and filters, removes the material that particle is larger, and the large granular materials filtered down enters pulverizer and pulverizes rear reuse, and the material after filtration is extruded into raw material base by pre-extruded forming machine;
4, shaping: the raw material base of pre-extruded is extruded into cellular idiosome by extrusion shaping machine again, rub during extrusion shaping machine work and between material and produce amount of heat, need indirectly to cool extrusion shaping machine with cooling water, cooling water circulation recycle;
5, dry: cellular idiosome to be placed in hothouse and to carry out drying, dry employing steam indirect, a large amount of moisture content in main removal idiosome, it comprises I grade of drying, II grade of drying, I grade of drying is specially and will extrudes, catalyst prod after aging is contained in the fiberboard carton of liner polyurethane sponge, then be placed on I grade of desiccant shelf, I grade of desiccant shelf is advanced in dry I Room and carries out drying, air in dry I Room send through the heating of steam heater and carries out drying to catalyst prod by the circulating fan of dry I Room, 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 take out from cardboard box through I grade of dried catalyst prod afterwards, be placed on II grade of dry shelf, sealing and liner is filled out between catalyst prod, between catalyst prod and the dry shelf of II dry level, then II grade of dry shelf is advanced and carry out drying dry II case, the hot gas blower fan of dry II case extracts the air in air, send in dry II case after steam heater heating, catalyst prod is carried out evenly dry further, 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, thus reduce energy consumption further,
6, roasting: proceed to immediately in tunnel cave after being taken out in drying room by dried cellular idiosome, by electrical heating, temperature is slowly risen to 700 DEG C, in calcination process, ammonium metavanadate can produce ammonia under the high temperature conditions; Reaction equation is as follows:
2NH
4VO
3 →2NH
3↑+ V
2O
5+H
2O；
Calcining terminates rear idiosome and naturally cools in tunnel cave; Calcine, naturally cool whole process need 24 hours, natural cooling process in roasting technique needs to blast air in tunnel cave, and can enter in air due to the particle on idiosome surface, therefore the waste gas produced in tunnel cave, comprise dust and ammonia, by aiutage high altitude discharge after sack cleaner process;
7, process: cooled cellular semi-finished product remove 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 inspection, assembling, and warehouse-in prepares 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 DEG C ~ 30 DEG C, and the high temperature equipment pipes such as all hot blasts, steam all establish attemperator, make surface temperature lower than 50 DEG C, it can effective economize energy.
The equipment of whole technique takes following conservation measures:
(1) mixer adopts imported product, and equipment adopts double speed to drive, and greatly can reduce energy consumption when slowly running;
(2) extruder adopts variable frequency adjustment to drive, and energy consumption can according to exerting oneself different and corresponding adjustment;
(3) low energy consumption type screw air compressor is adopted;
(4) main with in energy equipment, sintering of catalyst stove is that emphasis can equipment.This project selects 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, temperature diagnosis/control system and material sample tap/peep hole and kiln firebreak structure in kiln.The supporting each system introduction of stove is as follows:
A. frame structure
Body of heater length take 2m as unit modulus, adopts shaped steel (square steel tube and other shaped steel) to make skeleton, 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 is acted on the girder steel of kiln top by suspender member, covers corrugated steel plate bottom kiln, and kiln side wall and kiln bottom heaviness pass through the even power transmission of corrugated sheet to kiln base cross members, 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 Whole fiber folded piece inner lining structure, directly can start kiln in cold conditions situation, and compared with must controlling lifting/lowering temperature speed with traditional structure, fully fibrous structure eliminates the baker program before the use of newly-built stove, thus saves 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 (being equivalent to 1/10th of common fireproof insulation brick), accumulation of heat are little, greatly dissipated heat can be reduced.
Claims (5)
1. a SCR honeycomb denitrating catalyst manufacture craft, is characterized in that: it comprises batching successively, mixing, pre-extruded, shaping, dry, roasting, processing, assembling are dispatched from the factory, and the operation of its concrete technology is as follows:
A, batching: outsourcing ammonium metavanadate, titanium dioxide, titanium dioxide is unpacked between reinforced pour in titanium dioxide tank stand-by, ammonium metavanadate and water are mixed with concentration be 0.5% ~ 3% ammonium metavanadate solution stand-by;
B, mixing: the titanium dioxide in titanium dioxide tank relies on Action of Gravity Field, directly enters mixer by self-measuring device; The ammonium metavanadate solution of 0.5% ~ 3% is squeezed in mixer by pump, the mass ratio of titanium dioxide and ammonium metavanadate solution is 12:1, add simultaneously mass ratio be 1.2% hydroxypropyl methylcellulose and mass ratio be 0.7% PEO mediate as binding agent;
C, pre-extruded: mixed material enters filter and filters, remove the material that particle is larger, and the large granular materials filtered down enters pulverizer and pulverizes rear reuse, and the material after filtration is extruded into raw material base by pre-extruded forming machine;
D, shaping: the raw material base of pre-extruded is extruded into cellular idiosome by extrusion shaping machine again, rub during extrusion shaping machine work and between material and produce amount of heat, need indirectly to cool extrusion shaping machine with cooling water, cooling water circulation recycle;
E, drying: cellular idiosome is placed in hothouse and carries out drying, dry employing steam indirect, a large amount of moisture content in main removal idiosome; It comprises I grade of drying, II grade of drying, I grade of drying is specially and is contained in the fiberboard carton of liner polyurethane sponge by the catalyst prod after extruded, then be placed on I grade of desiccant shelf, I grade of desiccant shelf is advanced in dry I Room and carries out drying, air in dry I Room send through the heating of steam heater and carries out drying to catalyst prod by the circulating fan of dry I Room, to reduce the humidity of catalyst prod and to increase semi-finished product intensity, reach the requirement of demanding party; To take out from cardboard box through I grade of dried catalyst prod afterwards, be placed on II grade of dry shelf, sealing and liner is filled out between catalyst prod, between catalyst prod and II grade of dry shelf, then II grade of dry shelf is advanced and carry out drying dry II case, the hot gas blower fan of dry II case extracts the air in air, send in dry II case after steam heater heating, catalyst prod is carried out evenly dry further, reach the requirement of demanding party, for product roasting provides qualified semi-finished product;
F, roasting: proceed to immediately in tunnel cave after being taken out in drying room by dried cellular idiosome, by electrical heating, temperature is slowly risen to 700 DEG C, in calcination process, ammonium metavanadate can produce ammonia under the high temperature conditions; Calcining terminates rear idiosome and naturally cools in tunnel cave; Calcine, naturally cool whole process need 24 hours;
G, processing: cooled cellular semi-finished product remove 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 inspection, assembling, and warehouse-in prepares 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 reinforced between be furnished with sack cleaner, a small amount of dust produced in the reinforced process of 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; mixer inside is made to keep certain negative pressure; the dust produced during to guarantee to mix in mixer is not excessive, and a small amount of dust produced in centrifugal blower air draft process discharges after sack cleaner process.
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 can enter in air due to the particle on idiosome surface, therefore the waste gas produced in tunnel cave, comprise dust and ammonia, by aiutage high altitude discharge after sack cleaner process.
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, direct extraction hot blast recycling, can make wind-warm syndrome than outdoor get wind high 10 DEG C ~ 30 DEG C, and all hot blasts, steam high-temperature service pipeline all establish attemperator, make surface temperature lower than 50 DEG C.
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| 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 |
| 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 |
| 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 |
| 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 |
| 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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| CN102614866A (en) * | 2012-03-01 | 2012-08-01 | 浙江大学 | Honeycomb SCR smoke denitration catalyst embryoid body and preparation method thereof |
| 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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| US8242049B2 (en) * | 2005-12-08 | 2012-08-14 | The Hong Kong University Of Science And Technology | Low temperature ammonia remediation catalysts |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102614866A (en) * | 2012-03-01 | 2012-08-01 | 浙江大学 | Honeycomb SCR smoke denitration catalyst embryoid body and preparation method thereof |
| 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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