CN105233644B - Coal-fired flue gas dust-removing desulfurization and denitrification integrated compound technology system - Google Patents
Coal-fired flue gas dust-removing desulfurization and denitrification integrated compound technology system Download PDFInfo
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- CN105233644B CN105233644B CN201510789500.2A CN201510789500A CN105233644B CN 105233644 B CN105233644 B CN 105233644B CN 201510789500 A CN201510789500 A CN 201510789500A CN 105233644 B CN105233644 B CN 105233644B
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Abstract
The invention relates to a coal-fired flue gas dust-removing desulfurization and denitrification integrated compound technology system which is arranged as complete equipment for high-temperature flue gas dust-removing desulfurization and denitrification and waste heat utilization. A ceramic multi-tube dust cleaner is used for roughly removing dust and desulfurizing; a ceramic filtering film filter is used for deeply purifying, removing dust and denitration; the waste heat of the flue gas is utilized by a heat exchanger to change cold air into hot air; the hot air enters into a boiler combustion opening to support the combustion; metal and nonmetal oxides serve as the manufacturing materials of a micro-pore ceramic filtering pipe; the manufacturing materials serve as the catalyst main body and the carrier; a high-temperature ceramic method is combined for sintering and preparing the catalyst under certain temperature. The coal-fired flue gas dust-removing desulfurization and denitrification integrated compound technology is a high-temperature dust-removing desulfurization and denitrification integrated technique, is especially used for replacing an electric dust remover for purifying the coal-fired flue gas, is free from explosion hazard and is safe and reliable; the investment is saved; utilization for the heat energy is increased; the energy-saving effect is enhanced; the design is simple; the structure is reasonable; the coal-fired flue gas dust-removing desulfurization and denitrification integrated compound technology system is an energy-saving, emission-reducing, transforming and upgrading trans-century brand product made in China at present.
Description
Technical field
Patent of the present invention is related to a kind of fire coal boiler fume while dust-removal and desulfurizing denitration combination process system.
Background technology
Dedusting industrial at present and SOx/NOxRemoving, existing technique is the limestone scrubbing FGD after dedusting
WFGD and dry type SCR, each independent work of three kinds of technologies, its three complete equipment is bulky, complex structure, and floor space is big,
Investment and operating cost are high.In order to reduce the expense of gas cleaning, adapt to the needs of power plant, the new technique of combined desulfurization and denitration is
Become the trend of gas cleaning.
National requirements for environmental protection from 1 day July in 2014, newly-built enterprise from the standard implementation,
Thermal power generation boiler smoke dust discharge concentration：
Discharged from coal-fired boiler concentration 20-30mg/Nm3
Oil burning boiler concentration of emission 20-30mg/Nm3
Sulfur dioxide emissioning concentration 50-100/200mg/Nm3
Nitrogen oxides are with NO2Meter 100/Nm3
Mercury and mercuric compounds 0.03mg/Nm3
Single desulphurization denitration technology, work are used coal-fired flue-gas (containing coal gas) dust-removal and desulfurizing denitrating technique both at home and abroad at present more
Skill is complicated, occupation area of equipment is big, and investment operating cost is high, and research and development advanced technology of new generation, the combined desulfurization of economical rationality take off
Nitre process system becomes inexorable trend.
Summary, needs to develop a kind of new dry process high-temperature flue gas purification process system at present, and flue-gas temperature is at 300 DEG C
In the range of～500 DEG C, total efficiency of dust collection is more than 99.9%, and the efficiency of desulphurization denitration can reach more than 90%, while taking into account waste heat
Utilize.
The content of the invention
The purpose of patent of the present invention there is provided a kind of coal-fired flue-gas dust-removing and desulfurization denitration combination process system, and it is high temperature
Flue-gas dust-removing and desulfurization denitration and the complete set of equipments of UTILIZATION OF VESIDUAL HEAT IN, mainly carry out thick dedusting desulfurization, pottery by ceramic multicyclone dust collector
Porcelain filters film filter and carries out deep-purification dedusting denitration, and cold wind is become hot blast using fume afterheat by heat exchanger, into pot
Stove port is combustion-supporting.The manufacture material of filter mantle is metal and nonmetal oxide, inherently catalyst body
And carrier, with reference to high-temperature ceramicss method, sintering prepares catalyst at a certain temperature.As heterogeneous catalysiss are a kind of superficial phenomena, it
Betide on the surface of solid catalyst, the filter mantle addition expanding agent to ceramic filter film filter so as to hole
Gap rate increases, active surface area's increase, and applying has enough activity in 300 DEG C～500 DEG C temperature ranges, it is possible to obtain pole
Good denitration effect.In this patent the running resistance of the filter mantle of ceramic filter film filter be only 1500Pa-
3000Pa, already close to the running resistance of existing sack cleaner：1000Pa-1800Pa, with fabulous energy-saving effect and should
With value.Meanwhile, be the floor space of reduction equipment, filter mantle have been achieved with diameter and length in terms of breakthrough：
A diameter of ф 130mm- ф 150mm, single-piece length is up to more than 4 meters, and the maximum gauge of similar products at home and abroad is ф 60mm, single
Zhi Changdu is only less than 1.5 meters, i.e. under equal dust removing effects, equips the device height of the filter mantle than equipment
The device height of traditional filtering pipe is higher, and long cross direction is smaller, so as to more save floor space.Above-mentioned micropore ceramics
Progress in terms of the diameter and length of filter tube, for the thin-wall pipe for requiring breathability and intensity simultaneously, it may be said that be one
Plant historical breakthrough.High temperature fume dust removal takes off SO2De- NOx, the discharge standard that process system described in this patent can reach is：
(1) particulate matter 10mg/Nm3
(2) remove SO2Efficiency reaches more than 95%
(3) remove NOx efficiency and reach 95%
The purpose of the present invention is achieved through the following technical solutions：Fire coal boiler fume dust-removal and desulfurizing denitration combination process
System, is mainly gone here and there by pipeline successively by multi-tube dust cleaner, ceramic filter film filter, heat exchanger, air-introduced machine and diffusing chimney
Connection is constituted；The dust removing units shape and structure of the multi-tube dust cleaner is as follows：Constituted and be made as by airway, guider and Whirlwind cyclone
Integrally, guider is connected and composed by straight tube a, helical blade assembly b and cylindrical drum c, and the top of cylindrical drum c is provided with several V-types and opens
Mouthful, helical blade assembly b, at least three blades of helical blade assembly b, the external diameter of helical blade assembly b are installed in cylindrical drum c
It is fitted close with the internal diameter of cylindrical drum c, straight tube a is installed in helical blade assembly b, the external diameter of straight tube a is with helical blade assembly b's
Internal diameter is fitted close, and V-type opening, the inwall of cylindrical drum c, the outer wall of straight tube a and helical blade assembly b link together, and structure
Spirality gas port, the lower end of cylindrical drum c are connected with the upper end of Whirlwind cyclone, and cylindrical drum c lower surface seat is mounted in above Whirlwind cyclone
End, the gap between its both ends of the surface are fitted close, and high-temperature ceramicss adhesive layer is provided between both ends of the surface, the gap of both ends of the surface border
Sealant sealing is provided with, the upper end of straight tube a is connected with the lower end of airway；Dust removing units are in casing using serial or parallel connection
Mode is arranged, and is filled a vacancy with perlite between Whirlwind cyclone, and alumina cement sealant is provided with above perlite, and ash-laden gas is by guider
Straight tube a and cylindrical drum c between space enter, Jing helical blade assembly b tangentially rotate into Whirlwind cyclone, and dust is in centrifugal force
Effect lower edge Whirlwind cyclone inwall falls, clean gas then from whirlwind subcenter upwardly through guider straight tube a, airway heel row
Go out；Sealing dividing plate is provided with casing, the airway of dust removing units is protruded upward outside sealing dividing plate, and sealing dividing plate is close with alumina cement
It is inlet chamber between sealing, is outlet chamber above sealing dividing plate；Flue gas Jing after multi-tube dust cleaner dedusting enters back into ceramic filter
The inlet chamber of film filter carries out deep purifying, final dust exhausting concentration ＜ 10mg/Nm3, the filtration in ceramic filter film filter
Unit is made up of filter mantle A and filter membrane B, the overcoating filter membrane B of filter mantle A；This process system is also wrapped
Desulfurizing agent storehouse and reducing agent storehouse are included, desulfurizing agent storehouse is communicated with the admission line of Dg250 multi-tube dust cleaners, to Dg250 multi-tube dustings
Device supplies desulfurizing agent, reducing agent storehouse to communicate with the admission line of ceramic filter film filter, is that ceramic filter film filter supplies reduction
Agent.
For the purpose for further realizing patent of the present invention, below scheme can be also adopted：The quantity of the multi-tube dust cleaner is
Two, respectively Dg250 multi-tube dust cleaners and Dg160 multi-tube dust cleaners, Dg250 multi-tube dust cleaners and Dg160 multi-tube dust cleaners
It is sequentially connected in series, Dg160 multi-tube dust cleaners are identical with the structure of Dg250 multi-tube dust cleaners, difference is only in Dg160 multi-tube dust cleaners
Dust removing units be Dg160, the dust removing units of Dg250 multi-tube dust cleaners are Dg250, the outlet chamber of Dg250 multi-tube dust cleaners and
The inlet chamber of Dg160 multi-tube dust cleaners communicates realization series connection, outlet chamber and the ceramic filter film filter of Dg160 multi-tube dust cleaners
Inlet chamber communicate, multi-tube dust cleaner efficiency of dust collection is up to more than 98.8%.The row of the lower end ash bucket of the Dg250 multi-tube dust cleaners
Grey mouth arranges the three-way pipeline with control valve：Communicate with the admission line of Dg250 multi-tube dust cleaners all the way, it is directly outer all the way
Row.The blank of material weight ratio of the dust removing units be cordierite 50%, alumina silicate fibre 30%, fire clay 20%, its raw material
Particle diameter is 30-60 mesh；Blank and water by weight 100:60 ratio stirs extrusion molding after evacuation, molding blank
Sinter in tunnel cave and form, sintering temperature is 1200 DEG C～1300 DEG C.The base substrate of the filter mantle A is by following heavy
Extrusion molding after amount proportioning mixing.
1), major ingredient：The ingredients by weight ratio of base substrate：Kaolin 40%, kieselguhr 35%, bauxite 20%, bentonite 5%, wherein
Kaolin has high mechanical strength, and kieselguhr has a large amount of pore space structures and adsorptivity, and bauxite has high mechanical strength
And anti-wear performance, bentonite has high caking property.The kieselguhr can select terra silicea purificata.
2), the first adjuvant：Charcoal powder is adopted for pore creating material, 26%, Jing high temperature sintering of the adding proportion for major ingredient gross weight
Afterwards, burning volatilization completely, forms micropore.
3), the second adjuvant：Using paraffin as bonding demoulding lubricant and pore creating material, adding proportion is major ingredient gross weight
2%, the substantially all burning in sintering can increase micropore, improve porosity.
4), the 3rd adjuvant：Using waterglass as reinforcing agent, adding proportion is the 2-5% of major ingredient gross weight, can keep
The intensity of dry/wet blank.
5), sintering process：Major ingredient and three kinds of adjuvants add water and are sufficiently mixed and make after extrusion molding blank, and the weight that adds water is
The 35% of major ingredient weight, blank room temperature dry, and the time is not less than 48 hours, need slowly from room temperature to 200 DEG C of stages when sintering heats up
Improve, programming rate be 10 DEG C/h, so as to blank dry it is indeformable, 200 DEG C of -300 DEG C of stage programming rates be 3 DEG C/min,
300 DEG C of -450 DEG C of stage programming rates be 7 DEG C/min, be incubated 2 hours, 450 DEG C of -700 DEG C of stage programming rates be 7 DEG C/
Min, blowing out naturally cool to 100 DEG C of taking-up blanks, reject loading of kiln again after outward appearance defective work, are heated up with the speed of 7 DEG C/min
To after 950 DEG C, sintering completes blowing out.Also include economizer and baffle dust catcher, the flue gas of coal-burning boiler is by economizer exit and province
The flue gas that intracavity is extracted out on coal device is mixed, and temperature is 300 DEG C～500 DEG C, and 40%- is removed in the pre- dedusting of Jing baffle dust catchers
After 50% dust (mainly big dust particle of the particle diameter for more than 50um), sequentially enter Dg250 multi-tube dust cleaners and Dg160 is more
In pipe cleaner unit, and the part coarse powder dirt and unreacted desulfurization of desulfurizing agent in desulfurizing agent storehouse and the discharge of multi-tube dust cleaner ash bucket
Agent sprays into multi-tube dust cleaner air inlet intracavity together, carries out dust-removal and desulfurizing,；Desulfurizing agent is CaO, and calcium to sulphur mole ratio is 1：2, multitube is removed
The desulfurization degree of dirt device>More than 95%；When flue gas after dedusting enters back into ceramic filter film filter, reducing agent storehouse is simultaneously to ceramics
Filter, reducing agent is ammonia, liquefied ammonia or carbamide, works as NH3The mol ratio of/NOx is 0.85, ammonia
Escaped quantity<4mg/Nm3When, denitration rate>90%.The filter mantle A is supporter, and filter membrane B is high temperature aluminium silicate
The soft paper of fiber, filter membrane B surface press the pitch winding carbon fiber rope of 20mm, and during work, the dust layer of filter membrane B surface was formed
Filtering layer, prevents dust in filter mantle A, so that in-depth filtration is changed into surface filtration, improves dedusting essence
Degree, final dust exhausting concentration can reach 10mg/Nm3Below.The guide vane inclination angle of the guider improves dedusting by for 25 °
Efficiency.
The beneficial effects of the present invention is：It can be widely applicable to coal-fired flue-gas, coal gas of converter, producer gas, carbide
Producer gas, steel-smelting electric furnace flue gas, sintering flue gas, the purified treatment of various industrial furnace flue gases, are that a kind of high-temperature dust removal desulfurization takes off
Nitre integrated technique, particularly substitutes electric cleaner purification coal gas, and without explosion danger, safe and reliable, investment reduction improves heat energy
Utilize, increase energy-saving effect, design is simple, rational in infrastructure, is the cross-centennial Chinese making product of current energy-saving and emission-reduction, transition and upgrade
Board product.Dust removing units and filter element be by the special ceramics of metal and metalloid oxide powder compound extrusion molding,
Gas-solid catalysis agent body and carrier are prepared into using high-temperature ceramicss sintering process, make powder that mutually dispersion and solid-state reaction to occur, from
And obtain hybrid solid oxide catalyst.In order that solid reaction quickly occurs, it is desirable to certain high temperature.High-temperature ceramicss method can
To be applied to the application (0.5-1.0m of low specific surface area body catalyst2/ g), it must have the ability of anti-inactivation in the reaction.
Although multi-tube dusting unit and filter element all possess solid catalyst and carrier characteristics, as purposes requires difference, just need
Improve their manufacturing process.Using high-temperature dry simultaneous SO_2 and NO removal, traditional wet method WFGD reactor is not adopted, is not dropped
Low flue-gas temperature, it is to avoid the corrosion of low temperature and high relative humidity humid flue gas and the water smoke of smoke stack emission mouth and gypsum rain phenomenon, while reaching
To UTILIZATION OF VESIDUAL HEAT IN purpose.
Description of the drawings
Fig. 1 is the structural representation of coal-fired flue-gas integration combination process system described in patent of the present invention, and Fig. 2 is the pottery
The schematic diagram of the structure of the ceramic dust removing units of porcelain improved ceramic multi-tube dust cleaner, Fig. 3 are the ceramic filter film filters
The schematic diagram of filter element.
Reference：1st, boiler；2nd, baffle dust catcher；3rd, desulfurizing agent storehouse；4th, Dg250 ceramic multicyclone dust collectors；5、Dg160
Ceramic multicyclone dust collector；6th, ceramic filter film filter；7th, reducing agent storehouse；8th, heat exchanger；9th, air-introduced machine；10th, diffusing chimney；
11st, user；12nd, airway；13rd, guider；14th, Whirlwind cyclone；15th, alumina cement sealant；16th, location hole；17th, hole for hoist；
18 casings；19 sealing dividing plates；20 economizers；A, straight tube；B, helical blade；C, cylindrical drum；D, short tube；A, micropore ceramic filter
Pipe；B, filter membrane.
Specific embodiment
As shown in figure 1, the fire coal boiler fume dust-removal and desulfurizing denitration combination process system described in patent of the present invention, mainly by
Multi-tube dust cleaner, ceramic filter film filter 6, heat exchanger 8, air-introduced machine 9 and diffusing chimney 10 are followed in series to form by pipeline.
The multi-tube dust cleaner can be Dg250 multi-tube dust cleaners 4 or Dg160 multi-tube dust cleaners 5.As shown in Fig. 2 multi-tube dust cleaner
Dust removing units shape and structure is as follows：One is made up of and is made as airway 12, guider 13 and Whirlwind cyclone 14.Guider 13 is by straight
Pipe a, helical blade assembly b and cylindrical drum c are connected and composed.The top of cylindrical drum c is provided with several V-type openings, cylindrical drum c and installs
At least three blades of helical blade assembly b, helical blade assembly b, the external diameter of helical blade assembly b and the internal diameter of cylindrical drum c
It is fitted close, straight tube a is installed in helical blade assembly b, the external diameter of straight tube a is fitted close with the internal diameter of helical blade assembly b, V
Type opening, the inwall of cylindrical drum c, the outer wall of straight tube a and helical blade assembly b link together, and constitute guiding qi in spirality hole,
The lower end of cylindrical drum c is connected with the upper end of Whirlwind cyclone 14, and cylindrical drum c lower surface seat is mounted in Whirlwind cyclone 14 and holds above, its both ends of the surface
Between gap be fitted close, and between both ends of the surface, be provided with high-temperature ceramicss adhesive layer, the gap of both ends of the surface border is provided with sealant
Sealing, the upper end of straight tube a is connected with the lower end of airway 12.Dust removing units are arranged in casing 18 by the way of serial or parallel connection
Row, are filled a vacancy with perlite between Whirlwind cyclone 14, alumina cement sealant 15 are provided with above perlite, and ash-laden gas is by guider 13
Straight tube a and cylindrical drum c between space enter, Jing helical blade assembly b tangentially rotate into Whirlwind cyclone 14, and dust is in centrifugation
14 inwall of power effect lower edge Whirlwind cyclone falls, clean gas then from 14 center of Whirlwind cyclone upwardly through guider 13 straight tube a, lead
Discharge after trachea 12；Sealing dividing plate 19 is provided with casing 18, the airway 12 of dust removing units is protruded upward outside sealing dividing plate 19, close
It is inlet chamber between packing plate 19 and alumina cement sealant 15, is outlet chamber above sealing dividing plate 19.Into flue gas distribution
Purify to each dust removing units, dust falls within ash bucket discharge, clean gas enter inducing QI room, then Jing ceramic filter membranes by airway
6 precision processing of filter, the gas outlet of ceramic filter film filter 6 are connected with the air inlet of tubular heat exchanger 8 by pipeline, so
It is connected with diffusing chimney 11 by air-introduced machine 9 afterwards, is connected with user 11 also by tubular heat exchanger 8.
Flue gas Jing after multi-tube dust cleaner dedusting enters back into the inlet chamber of ceramic filter film filter 6 and carries out deep purifying,
Final dust exhausting concentration ＜ 10mg/Nm3, the filter element in ceramic filter film filter 6 is by filter mantle A and filter membrane
B is constituted, the overcoating filter membrane B of filter mantle A；This process system also includes desulfurizing agent storehouse 3 and reducing agent storehouse 7, desulfurizing agent
Storehouse 3 is communicated with the admission line of Dg250 multi-tube dust cleaners 4, supplies desulfurizing agent, reducing agent storehouse 7 and pottery to Dg250 multi-tube dust cleaners 4
Porcelain filters the admission line of film filter 6 and communicates, and is that ceramic filter film filter 6 supplies reducing agent.
Priority scheme is that the process system at least includes 4, Dg160 multi-tube dusting of a Dg250 multi-tube dust cleaner
Device, 6, heat exchanger 8 of a ceramic filter film filter are constituted, and level Four equipment is effectively combined, high-temperature fuel gas temperature control
Between 300～500 DEG C, final dust exhausting concentration reaches 10mg/Nm3, denitrification efficiency can reach more than 90%, and fully return
Receive heat energy.Twin-stage ceramic multicyclone dust collector is that Dg250 multi-tube dust cleaners 4 and Dg160 multi-tube dust cleaners 5 are used in series, to improve
Efficiency of dust collection.The quantity of the multi-tube dust cleaner is two, respectively Dg250 multi-tube dust cleaners 4 and Dg160 multi-tube dust cleaners 5,
Dg250 multi-tube dust cleaners 4 and Dg160 multi-tube dust cleaners 5 are sequentially connected in series, Dg160 multi-tube dust cleaners 5 and Dg250 multi-tube dust cleaners 4
Structure it is identical, difference is only a diameter of Dg160 of dust removing units in Dg160 multi-tube dust cleaners 5, Dg250 multi-tube dust cleaners 4
The a diameter of Dg250 of dust removing units, the inlet chamber of the outlet chamber and Dg160 multi-tube dust cleaners 5 of Dg250 multi-tube dust cleaners 4 communicate reality
Now connect, the outlet chamber of Dg160 multi-tube dust cleaners 5 is communicated with the inlet chamber of ceramic filter film filter 6, multi-tube dust cleaner dedusting
Efficiency is up to more than 98.8%.In Dg250 multi-tube dust cleaners 4, the nominal dimension of dust removing units is Dg250.Multi-tube dust cleaner it is single
The process air quantity of dust removing units is by original 750m3/ h improves 830m till now3/ h, corresponding Whirlwind cyclone cross section average air
Rate of flow of fluid brings up to 4.7m/s by 4.25m/s.Because cyclone dust extractor is the centrifugal force produced by the dusty gas using rotation,
Dust is separated from air-flow, as the increase of gas flow rate, the centrifugal force of grit increase, efficiency of dust collection can just be carried
Height, has adapted to the raising of environmental emission standard.Generally, average gas flow velocity in Whirlwind cyclone cross section is 3.5-4.75m/s,
Increase flow velocity and will not significantly improve efficiency, but increase of wearing and tearing.Flow velocity is decreased obviously after efficiency of dust collection less than after 3.5m/s, and is revolved
Wind has the danger blocked by dust.
The dust removing units of multi-tube dust cleaner require high temperature resistant, antioxidation, corrosion-resistant, and it is 300 DEG C～600 DEG C to commonly use temperature,
It is even possible that being used in 600 DEG C～1000 DEG C.Desulfurization while patent main innovation point of the present invention is ash-laden gas high-temperature dust removal
Denitration.When ceramic multi-tube dust removing units are sintered, inorganic additive composition proportion is changed, sintering temperature is improved to 1200-
1300 DEG C, the helix angle of guider is reduced, increase the processing gas flow of unit dust removing units, make ceramic dust removing units
Possess flue gas ash removal efficiency high, the characteristic of high temperature oxidation resisting corrosion.Concrete scheme is as follows：The blank of material of the dust removing units
Weight ratio is cordierite 50%, alumina silicate fibre 30%, fire clay 20%, and its raw material particle size is 30-60 mesh；Blank is pressed with water
Weight compares 100:60 ratio stirs extrusion molding after evacuation, and molding blank is sintered in tunnel cave and formed, sintering temperature
Spend for 1200 DEG C～1300 DEG C.
The filter mantle A also serves as solid catalyst and carrier, as heterogeneous catalysiss are that occur in solid catalysis
On agent surface, in order that catalyst has more active sites, it is desirable to which it has surface area as big as possible, and external surface area can not
Can be very big, what needs increased is internal surface area it is necessary to increase the porous of solid catalyst, raising porosity, active surface face
2-3 times of product increase, improves the utilization of active component, therefore ceramic filtration membrane supporter makes micropore ceramic tube.
The base substrate of the filter mantle A presses extrusion molding after the mixing of following weight proportions,
1), major ingredient：The ingredients by weight ratio of base substrate：Kaolin 40%, kieselguhr 35%, bauxite 20%, bentonite 5%, wherein
Kaolin has high mechanical strength, and kieselguhr has a large amount of pore space structures and adsorptivity, and bauxite has high mechanical strength
And anti-wear performance, bentonite has high caking property.The kieselguhr can select terra silicea purificata.
2), the first adjuvant：Charcoal powder is adopted for pore creating material, 26%, Jing high temperature sintering of the adding proportion for major ingredient gross weight
Afterwards, burning volatilization completely, forms micropore.
3), the second adjuvant：Using paraffin as bonding demoulding lubricant and pore creating material, adding proportion is major ingredient gross weight
2%, the substantially all burning in sintering can increase micropore, improve porosity.
4), the 3rd adjuvant：Using waterglass as reinforcing agent, adding proportion is the 2-5% of major ingredient gross weight, can keep
The intensity of dry/wet blank.
5), sintering process：Major ingredient and three kinds of adjuvants add water and are sufficiently mixed and make after extrusion molding blank, and the weight that adds water is
The 35% of major ingredient weight, blank room temperature dry, and the time is not less than 48 hours, need slowly from room temperature to 200 DEG C of stages when sintering heats up
Improve, programming rate be 10 DEG C/h, so as to blank dry it is indeformable, 200 DEG C of -300 DEG C of stage programming rates be 3 DEG C/min,
300 DEG C of -450 DEG C of stage programming rates be 7 DEG C/min, be incubated 2 hours, 450 DEG C of -700 DEG C of stage programming rates be 7 DEG C/
Min, blowing out naturally cool to 100 DEG C of taking-up blanks, reject loading of kiln again after outward appearance defective work, are heated up with the speed of 7 DEG C/min
To after 950 DEG C, sintering completes blowing out.
The heat exchanger 8 is tubular heat exchanger.The ceramic filter film filter 6 is micropore ceramic filter membrane filtration
Device.Multi-tube dust cleaner is improved ceramic multi-tube dust cleaner.
As shown in figure 1, the ash discharging hole of the lower end ash bucket of the Dg250 multi-tube dust cleaners 4 arranges the threeway with control valve
Pipeline：Communicate with the admission line of Dg250 multi-tube dust cleaners 4 all the way, it is directly outer all the way to arrange.
As shown in figure 1, the process system also includes economizer 20 and baffle dust catcher 2, the flue gas of coal-burning boiler 1 is by saving
Coal device 20 exports the flue gas extracted out with intracavity on economizer 20 and mixes, and temperature is 300 DEG C～500 DEG C, Jing baffle plate dedustings
After 40%-50% dust (mainly big dust particle of the particle diameter for more than 50um) is removed in 2 pre- dedusting of device, Dg250 is sequentially entered many
In pipe cleaner unit 4 and Dg160 multi-tube dust cleaners 5, and the portion discharged by desulfurizing agent in desulfurizing agent storehouse 3 and 4 ash bucket of multi-tube dust cleaner
Divide coarse powder dirt and unreacted desulfurizing agent to spray into 4 air inlet intracavity of multi-tube dust cleaner together, carry out dust-removal and desulfurizing,；Desulfurizing agent is
CaO, calcium to sulphur mole ratio are 1：2, the desulfurization degree of multi-tube dust cleaner>More than 95%；Flue gas after dedusting enters back into ceramic filter membrane mistake
During filter 6, reducing agent storehouse 7 sprays into reducing agent simultaneously into ceramic filter film filter 6, and reducing agent is ammonia, liquefied ammonia or urine
Element, works as NH3The mol ratio of/NOx is 0.85, the escaped quantity of ammonia<4mg/Nm3When, denitration rate>90%.
As shown in figure 3, the filter mantle A is supporter, filter membrane B is the soft paper of high temperature alumina silicate fibre, mistake
Filter membrane B surface presses the pitch winding carbon fiber rope of 20mm, and during work, the dust layer of filter membrane B surface forms filter layer, prevents
Dust so that in-depth filtration is changed into surface filtration, improves dedusting precision, final dust discharge in filter mantle A
Concentration can reach 10mg/Nm3Below.Micropore ceramics tube outer surface is improved to by traditional three ~ tetra- road alumina silicate fibre rope of winding
Soft paper membrane/the bag of overcoating high temperature alumina silicate fibre, surface press the pitch winding carbon fiber cord of 200mm, while reaching fume high-temperature
Dedusting and the purpose of denitration.
Operation principle：
The flue gas that the outlet of economizer 20 of boiler 1 and epicoele are extracted out is blended in a flue, and flue-gas temperature is 300-500
DEG C (conventional temperature be 380 DEG C), initially enters the dust that 40%-50% is removed in 2 pre- dedusting of baffle dust catcher, enters back into Dg250 many
Pipe cleaner unit 4, removes more than 90% big dust particle, removes particle diameter subsequently into follow-on Dg160 multi-tube dust cleaners 5
For the relatively fine dust of 5-50um, now, the coarse granule powder containing not sufficiently reactive CaO that 4 ash bucket of Dg250 multi-tube dust cleaners is discharged
Dirt, wherein communicating with the admission line of Dg250 multi-tube dust cleaners 4 all the way, the import into multi-tube dust cleaner 4 is recycled, separately
It is directly outer all the way to arrange；Meanwhile, thus the fresh CaO in lime powder bin 3 also adds, and is so repeatedly circulated, and reaches saving CaO
Consumption, extends CaO and smoke contacts time, improves the purpose of desulfuration efficiency.In 6 high-temperature flue gas import of ceramic filter film filter
Place sprays into reducing agent storehouse (NH3) with flue gas in NOxReaction, realizes SCR denitration.High-temperature flue gas after dust-removal and desulfurizing denitration are entered and are changed
Hot device 8, becomes cold air into hot-air, and being re-fed into the burning fire door of boiler 1 carries out combustion-supporting, and the low-temperature flue gas after heat exchange are by diffusing cigarette
Chimney 11 is discharged.
It is, using multi-tube dust cleaner and ceramic filter film filter, to carry out pre- dedusting and deep purifying, flue gas to flue gas
Final dust exhausting concentration ＜ 10mg/Nm3, and simultaneous SO_2 and NO removal.Pre- dedusting is carried out first, and main desulphurization reaction occurs in denitration
Before reaction, and after the pre- dedusting of baffle dust catcher dedusting；Denitration reaction be located at pre- dedusting and two-stage multi-tube dusting it
Afterwards, filter with ceramic filtration membrane essence and be combined together, udst separation runs through whole work technical process, three kinds of works of dedusting and desulphurization denitration
Skill process is combined closely, really realize high-temperature dust removal and double de-, it is to avoid in the de- technique of traditional double, high cloud of dust gas is to the catalyst longevity
The deposition of the impact, flying dust and ammonium salt of life is covered, in flying dust the metal ion such as K/Na/Ca/Si/As make catalyst contamination or in
Poison, SO3Deng impact of the gaseous state poisonous substance to catalyst the problems such as, rationally efficiently.
Claims (7)
1. fire coal boiler fume dust-removal and desulfurizing denitration combination process system, it is characterised in that：Mainly by multi-tube dust cleaner, ceramic mistake
Membrane filter (6), heat exchanger (8), air-introduced machine (9) and diffusing chimney (10) are followed in series to form by pipeline；The multitube
The dust removing units shape and structure of cleaner unit is as follows：Constituted and be made as one by airway (12), guider (13) and Whirlwind cyclone (14)
Body, guider (13) are connected and composed by straight tube (a), helical blade assembly (b) and cylindrical drum (c), and the top of cylindrical drum (c) is provided with
Helical blade assembly (b), at least three blades of helical blade assembly (b), spiral are installed in several V-type openings, cylindrical drum (c)
The external diameter of blade assembly (b) is fitted close with the internal diameter of cylindrical drum (c), and straight tube (a), straight tube are installed in helical blade assembly (b)
A the external diameter of () is fitted close with the internal diameter of helical blade assembly (b), V-type opening, the inwall of cylindrical drum (c), straight tube (a) it is outer
Wall and helical blade assembly (b) link together, and constitute guiding qi in spirality hole, lower end and the Whirlwind cyclone (14) of cylindrical drum (c)
Upper end connection, cylindrical drum (c) lower surface seat is mounted in Whirlwind cyclone (14) and holds above, and the gap between its both ends of the surface is fitted close,
And be provided with high-temperature ceramicss adhesive layer between both ends of the surface, the gap of both ends of the surface border is provided with sealant sealing, the upper end of straight tube (a) with
The lower end connection of airway (12)；Dust removing units are arranged in casing (18) by the way of serial or parallel connection, Whirlwind cyclone (14)
Between filled a vacancy with perlite, alumina cement sealant (15), straight tube of the ash-laden gas by guider (13) are provided with above perlite
A space between () and cylindrical drum (c) enters, Jing helical blades assembly (b) tangentially rotates into Whirlwind cyclone (14), dust from
Mental power function lower edge Whirlwind cyclone (14) inwall falls, and clean gas are then from Whirlwind cyclone (14) center upwardly through guider (13)
Straight tube (a), airway (12) are discharged afterwards；Sealing dividing plate (19) is provided with casing (18), the airway (12) of dust removing units is upwards
Stretch out sealing dividing plate (19) outward, be inlet chamber between sealing dividing plate (19) and alumina cement sealant (15), seal dividing plate (19)
Top is outlet chamber；Flue gas Jing after multi-tube dust cleaner dedusting enters back into the inlet chamber of ceramic filter film filter (6) and carries out depth
Degree purification, final dust exhausting concentration ＜ 10mg/Nm3, the filter element in ceramic filter film filter (6) is by filter mantle
(A) constitute with filter membrane (B), filter mantle (A) is cladded with filter membrane (B)；This process system also includes desulfurizing agent storehouse (3)
With reducing agent storehouse (7), desulfurizing agent storehouse (3) are communicated with the admission line of Dg250 multi-tube dust cleaners (4), to Dg250 multi-tube dust cleaners
(4) supply desulfurizing agent, reducing agent storehouse (7) to communicate with the admission line of ceramic filter film filter (6), be ceramic filter film filter
(6) supply reducing agent；The base substrate of the filter mantle (A) is by extrusion molding after the mixing of following weight proportions;
1), major ingredient：The ingredients by weight ratio of base substrate：Kaolin 40%, kieselguhr 35%, bauxite 20%, wherein bentonite 5%, kaolinite
Soil has high mechanical strength, and kieselguhr has a large amount of pore space structures and an adsorptivity, and bauxite has high mechanical strength and resistance to
Mill performance, bentonite have high caking property;The kieselguhr selects terra silicea purificata;
2), the first adjuvant：Charcoal powder is adopted for pore creating material, adding proportion for major ingredient gross weight 26% is Jing after high temperature sintering, complete
Full burning volatilization, forms micropore;
3), the second adjuvant：Using paraffin as bonding demoulding lubricant and pore creating material, adding proportion is the 2% of major ingredient gross weight,
The substantially all burning in sintering, increases micropore, improves porosity;
4), the 3rd adjuvant：Using waterglass as reinforcing agent, 2-5% of the adding proportion for major ingredient gross weight, dry/wet blank is kept
Intensity;
5), sintering process：Major ingredient and three kinds of adjuvants add water and are sufficiently mixed and make after extrusion molding blank, and the weight that adds water is major ingredient
The 35% of weight, blank room temperature dry, and the time is not less than 48 hours, and sintering slowly need to be carried from room temperature to 200 DEG C of stages when heating up
Height, programming rate be 10 DEG C/h, so as to blank dry it is indeformable, 200 DEG C of -300 DEG C of stage programming rates be 3 DEG C/min,
300 DEG C of -450 DEG C of stage programming rates are 7 DEG C/min, are incubated 2 hours, 450 DEG C of -700 DEG C of stage programming rates be 7 DEG C/
Min, blowing out naturally cool to 100 DEG C of taking-up blanks, reject loading of kiln again after outward appearance defective work, are heated up with the speed of 7 DEG C/min
To after 950 DEG C, sintering completes blowing out.
2. fire coal boiler fume dust-removal and desulfurizing denitration combination process system according to claim 1, it is characterised in that：It is described many
The quantity of pipe cleaner unit is two, respectively Dg250 multi-tube dust cleaners (4) and Dg160 multi-tube dust cleaners (5), and Dg250 multitubes are removed
Dirt device (4) and Dg160 multi-tube dust cleaners (5) are sequentially connected in series, Dg160 multi-tube dust cleaners (5) and Dg250 multi-tube dust cleaners (4)
Structure is identical, it is Dg160 that difference is only dust removing units in Dg160 multi-tube dust cleaners (5), and Dg250 multi-tube dust cleaners (4) remove
Dirt unit is Dg250, and the inlet chamber of the outlet chamber and Dg160 multi-tube dust cleaners (5) of Dg250 multi-tube dust cleaners (4) communicates realization
Series connection, the outlet chamber of Dg160 multi-tube dust cleaners (5) are communicated with the inlet chamber of ceramic filter film filter (6), and multi-tube dust cleaner is removed
Dirt efficiency is up to more than 98.8%.
3. fire coal boiler fume dust-removal and desulfurizing denitration combination process system according to claim 2, it is characterised in that：It is described
The ash discharging hole of the lower end ash bucket of Dg250 multi-tube dust cleaners (4) arranges the three-way pipeline with control valve：All the way with Dg250 multitubes
The admission line of cleaner unit (4) is communicated, directly outer all the way to arrange.
4. fire coal boiler fume dust-removal and desulfurizing denitration combination process system according to claim 1, it is characterised in that：It is described to remove
The blank of material weight ratio of dirt unit is cordierite 50%, alumina silicate fibre 30%, fire clay 20%, and its raw material particle size is 30-
60 mesh；Blank and water by weight 100:60 ratio stirs extrusion molding after evacuation, and molding blank is in tunnel cave
Sintering is formed, and sintering temperature is 1200 DEG C～1300 DEG C.
5. fire coal boiler fume dust-removal and desulfurizing denitration combination process system according to claim 3, it is characterised in that：Also include
Economizer (20) and baffle dust catcher (2), the flue gas of coal-burning boiler (1) is by intracavity on economizer (20) outlet and economizer (20)
The flue gas of extraction is mixed, and temperature is 300 DEG C～500 DEG C, and 40%-50% dust is removed in the pre- dedusting of Jing baffle dust catchers (2)
Afterwards, sequentially enter in Dg250 multi-tube dust cleaners (4) and Dg160 multi-tube dust cleaners (5), and desulfurizing agent storehouse (3) interior desulfurizing agent and
The part coarse powder dirt and unreacted desulfurizing agent that multi-tube dust cleaner (4) ash bucket is discharged sprays into multi-tube dust cleaner (4) inlet chamber together
It is interior, dust-removal and desulfurizing is carried out, desulfurizing agent is CaO, and calcium to sulphur mole ratio is 1：2, the desulfurization degree of multi-tube dust cleaner>More than 95%；After dedusting
Flue gas when entering back into ceramic filter film filter (6), reducing agent storehouse (7) are while spray into into ceramic filter film filter (6)
Reducing agent, reducing agent are ammonia, liquefied ammonia or carbamide, work as NH3The mol ratio of/NOx is 0.85, the escaped quantity of ammonia<4mg/Nm3When,
Denitration rate>90%.
6. fire coal boiler fume dust-removal and desulfurizing denitration combination process system, its feature according to any one of claim 1-5
It is：The filter mantle (A) is supporter, and filter membrane (B) is the soft paper of high temperature alumina silicate fibre, filter membrane (B) table
The pitch winding carbon fiber rope of 20mm is pressed in face, and during work, the dust layer on filter membrane (B) surface forms filter layer, prevents dust to enter
Enter in filter mantle (A), so that in-depth filtration is changed into surface filtration, improve dedusting precision, final dust exhausting concentration
Reach 10mg/Nm3Below.
7. fire coal boiler fume dust-removal and desulfurizing denitration combination process system, its feature according to any one of claim 1-5
It is：The guide vane inclination angle of the guider (13) is 25 °, improves efficiency of dust collection.
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| CN201510789500.2A CN105233644B (en) | 2015-10-20 | 2015-11-17 | Coal-fired flue gas dust-removing desulfurization and denitrification integrated compound technology system |
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| CN201510678801 | 2015-10-20 | ||
| CN2015106788018 | 2015-10-20 | ||
| CN201510789500.2A CN105233644B (en) | 2015-10-20 | 2015-11-17 | Coal-fired flue gas dust-removing desulfurization and denitrification integrated compound technology system |
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| CN105233644B true CN105233644B (en) | 2017-05-03 |
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| CN201510789500.2A Expired - Fee Related CN105233644B (en) | 2015-10-20 | 2015-11-17 | Coal-fired flue gas dust-removing desulfurization and denitrification integrated compound technology system |
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| CN205308106U (en) * | 2015-10-20 | 2016-06-15 | 济南环保陶瓷除尘技术研究所 | Compound process systems of coal -fired flue gas dedusting and desulfurizing denitration integration |
| ITUA20161375A1 (en) * | 2016-03-04 | 2017-09-04 | Francesco Riccobono | DEVICE FOR THE RELEASE OF HARMFUL EMISSIONS FROM PLANTS FOR DOMESTIC HEATING |
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| CN117101523B (en) * | 2023-10-24 | 2023-12-19 | 内蒙古蓝色火宴科技环保股份公司 | Powder mixing device for biomass fuel production |
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