CN111013381A - Cement kiln high temperature flue gas dust removal denitration integrated device - Google Patents

Cement kiln high temperature flue gas dust removal denitration integrated device Download PDF

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Publication number
CN111013381A
CN111013381A CN201911232619.4A CN201911232619A CN111013381A CN 111013381 A CN111013381 A CN 111013381A CN 201911232619 A CN201911232619 A CN 201911232619A CN 111013381 A CN111013381 A CN 111013381A
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China
Prior art keywords
integrated device
dedusting
flue gas
denitrating
cement kiln
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CN201911232619.4A
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Chinese (zh)
Inventor
张志刚
何义斌
王东歌
王彬
郑美玲
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Ctiec Environmental Protection Research Institute Jiangsu Co ltd
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Ctiec Environmental Protection Research Institute Jiangsu Co ltd
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Priority to CN201911232619.4A priority Critical patent/CN111013381A/en
Publication of CN111013381A publication Critical patent/CN111013381A/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/34—Chemical or biological purification of waste gases
    • B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
    • B01D53/86—Catalytic processes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D50/00—Combinations of methods or devices for separating particles from gases or vapours
    • B01D50/20—Combinations of devices covered by groups B01D45/00 and B01D46/00
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/34—Chemical or biological purification of waste gases
    • B01D53/46—Removing components of defined structure
    • B01D53/54—Nitrogen compounds
    • B01D53/56—Nitrogen oxides
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D17/00—Arrangements for using waste heat; Arrangements for using, or disposing of, waste gases
    • F27D17/004—Systems for reclaiming waste heat
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2258/00—Sources of waste gases
    • B01D2258/02—Other waste gases
    • B01D2258/0283—Flue gases
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P10/00—Technologies related to metal processing
    • Y02P10/25—Process efficiency

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Environmental & Geological Engineering (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Analytical Chemistry (AREA)
  • Biomedical Technology (AREA)
  • Health & Medical Sciences (AREA)
  • General Chemical & Material Sciences (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Treating Waste Gases (AREA)
  • Filtering Of Dispersed Particles In Gases (AREA)

Abstract

The invention discloses a cement kiln high-temperature flue gas dedusting and denitration integrated device, which comprises a preheater, a dedusting and denitration integrated device, a waste heat boiler, a cellar tail deduster and a chimney which are sequentially connected through pipelines according to the flow direction of flue gas, wherein the left end and the top end of the dedusting and denitration integrated device are respectively provided with an air inlet and an air outlet, the air inlet and the air outlet are respectively connected with an inlet smoke box and an ash removal box, the top of the ash removal box is provided with an outlet smoke box, an SCR denitration catalyst box is arranged between the ash removal box and the outlet smoke box, and a uniform distribution plate, a guide plate and a metal film dedusting mechanism are sequentially arranged inside the dedusting and denitration integrated device from left to. The invention has high dedusting and denitration efficiency, chemical corrosion resistance and long service life.

Description

Cement kiln high temperature flue gas dust removal denitration integrated device
Technical Field
The invention belongs to the technical field of flue gas treatment, and particularly relates to a dust removal and denitration integrated device for high-temperature flue gas of a cement kiln.
Background
As a cement production country in China, more than 3000 cement enterprises in China exist, about 1800 cement clinker production lines are produced by a novel dry method, the cement clinker production lines are distributed in 31 provinces and cities throughout the country, about 200 million t of nitric oxide is discharged every year in the cement production process, and about 15% of industrial emission of nitric oxide in the country, the national attention is paid to the emission of high nitric oxide in the cement industry, GB4915-2013 discharge Standard of pollutants for Cement industry, and 400mg/m of nitric oxide is executed by cement enterprises from 2015 7 and 1 th (new enterprises from 2014 3 and 1 th)3Emission Standard, focal region execution 320mg/m3Emission standard, the emission concentration of ammonia after denitration is required to be less than 8mg/m3However, referring to GB13223-2011 "emission Standard of atmospheric pollutants for thermal Power plants", the emission Limit of NOx for thermal Power plants in the Key region is 100mg/m3In particular 50mg/m after ultra low emissions3The emission standards of the cement industry are further tightened in view of the imbalance of emission standards among industries and the requirement of local emission reduction tasks.
The SCR denitration technology is used for blocking a catalyst by particles in tail gas on a cement kiln furnace, and an efficient catalyst must be installed, and basic substances CaO and SO in the flue gas2If the SCR is installed at the downstream of the dust remover, a flue gas reheater must be installed to heat the flue gas to the optimal working temperature of the catalyst, and the distribution of the SCR denitration flow field is not ideal, which may cause the problems of uneven ammonia nitrogen mixing, serious flue dust deposition, uneven flue gas flow velocity of the catalyst layer, too low or too high flow velocity in the local area of the catalyst layer, too large flow velocity deflection angle, etc., causing catalyst blockage or abrasion, which aggravates the uneven velocity distribution and forms vicious circle.
Disclosure of Invention
In order to overcome the defects in the prior art, the invention aims to provide the cement kiln high-temperature flue gas dedusting and denitration integrated device which is high in dedusting and denitration efficiency, resistant to chemical corrosion and long in service life.
In order to achieve the above object, the present invention adopts the following technical solutions:
the utility model provides a cement kiln high temperature flue gas dust removal denitration integrated device, include the preheater that connects gradually through the pipeline according to the flue gas flow direction, dust removal denitration integrated device, exhaust-heat boiler, cellar for storing things tail dust remover and chimney, dust removal denitration integrated device's left end and top are provided with air inlet and gas outlet respectively, import smoke box and deashing case are connected respectively to air inlet and gas outlet, the top of deashing case is provided with the export smoke box, be provided with SCR denitration catalyst case between deashing case and the export smoke box, dust removal denitration integrated device's inside has set gradually the equipartition board from left to right, guide plate and metallic film dust removal mechanism.
Preferably, the inlet smoke box is connected with an ammonia injection system through a pipeline, and the ammonia injection system comprises an ammonia production mechanism, a mixer and an injection mechanism which are connected in sequence.
Preferably, two ash hoppers are arranged at the bottom of the dust removal and denitration integrated device, and the bottom ends of the ash hoppers are connected with the powder bin through the conveying pipes.
More preferably, the material conveying pipe is provided with an ash discharge valve and a pneumatic gate valve.
Further preferably, draught fans are arranged between the preheater and the dust removal and denitration integrated device, between the dust removal and denitration integrated device and the waste heat boiler, and between the pit tail dust remover and the chimney.
Specifically, the top of aforementioned dust removal denitration integrated device is provided with overhauls the mechanism.
Preferably, the guide plate is a grid shaped like a Chinese character jing, the guide plate is arranged in a double-layer mode, and the guide plate plates positioned on the top layer are distributed towards two sides in an angle mode.
Still preferably, the metal film dust removing mechanism is a micro-filter element formed by molding a very fine metal fiber wire and metal powder through non-woven spreading, overlapping, isostatic pressing and the like, and sintering at a high temperature.
More preferably, the dust removal and denitration integrated device is insulated by glass fiber heat insulation cotton, and the thickness is more than or equal to 8 mm.
The invention has the advantages that: the integrated device has the advantages of simple equipment, high dedusting and denitration efficiency, chemical corrosion resistance, long service life and easiness in maintenance, can achieve a lower pollutant emission effect, consumes lower one-time investment and running cost, and is small in occupied area and simple in management; the application environment is wide, and the product can be normally and continuously used at the temperature below 500 ℃ and in an acidic or alkaline environment; high performance, high filtering precision and can realize 5mg/Nm3The requirement of ultra-clean discharge and the dust removal efficiency is as high as 99 percent.
Drawings
Fig. 1 is a schematic structural view of the present invention.
The meaning of the reference symbols in the figures: 1. preheater, 2, inlet smoke box, 31, ammonia making mechanism, 32, blender, 33, injection mechanism, 4, dust removal denitration integrated device, 41, equipartition board, 42, guide plate, 431, ash bucket, 432, unloading valve, 433, pneumatic push-pull valve, 434, powder storehouse, 44, metallic film dust removal mechanism, 45, deashing case, 46, SCR denitration catalyst case, 47, export smoke box, 48, maintenance mechanism, 5, draught fan, 6, exhaust-heat boiler, 7, cellar for storing things tail dust remover, 9, chimney.
Detailed Description
The invention is described in detail below with reference to the figures and the embodiments.
Referring to fig. 1, the high-temperature flue gas dedusting and denitration integrated device 4 for the cement kiln comprises a preheater 1, a dedusting and denitration integrated device 4, a waste heat boiler 6, a kiln tail deduster 7 and a chimney 9 which are sequentially connected through pipelines according to the flue gas flowing direction. Draught fans 5 are arranged between the preheater 1 and the dust removal and denitration integrated device 4, between the dust removal and denitration integrated device 4 and the waste heat boiler 6 and between the cellar tail dust remover 7 and the chimney 9.
An air inlet and an air outlet are respectively arranged at the left end and the top end of the dust removal and denitration integrated device 4, the air inlet and the air outlet are respectively connected with the inlet smoke box 2 and the ash removal box 45, an outlet smoke box 47 is arranged at the top of the ash removal box 45, an SCR denitration catalyst box 46 is arranged between the ash removal box 45 and the outlet smoke box 47, and a uniform distribution plate 41, a guide plate 42 and a metal film dust removal mechanism 44 are sequentially arranged inside the dust removal and denitration integrated device 4 from left to right.
The inlet smoke box is connected with an ammonia spraying system through a pipeline, and the ammonia spraying system comprises an ammonia making mechanism 31, a mixer 32 and an injection mechanism 33 which are connected in sequence. The ammonia production mechanism 31 is communicated with the mixer 32, the mixer 32 is communicated with the injection mechanism 33, the injection mechanism 33 is communicated with the inlet smoke box, the distance between the injection mechanism 33 and the dust removal and denitration device is not less than 3m, enough reaction time with smoke is reserved, and the effect of smoke desulfurization and denitration is better. The ammonia making mechanism 31 injects the prepared ammonia gas into the flue in an injection mode, and the ammonia gas and the flue gas enter the SCR reaction zone together, and then react with the flue gas under the action of the SCR denitration catalyst, so that the efficiency of flue gas denitration is effectively improved.
The bottom of the dedusting and denitration integrated device 4 is provided with two ash hoppers 431, and the bottom ends of the ash hoppers 431 are connected with the powder bin 434 through conveying pipes. The ash discharging valve 432 and the pneumatic gate valve 433 are arranged on the conveying pipe, the ash discharging valve 432 is an air locking or star-shaped ash discharging valve 432, and the ash discharging device has the advantages of stable and reliable work, uniform and accurate discharging, optimized structure, small volume and good sealing property. The top end of the dust removal and denitration integrated device 4 is provided with an overhaul mechanism 48.
The guide plate 42 is the groined type grid, adopts double-deck setting, and the guide plate 42 board page or leaf that is located the top layer is 10 and distributes toward both sides, and the water conservancy diversion is effectual.
The flow rate of flue gas is less than or equal to 2m/min, the operation temperature is set to 350 ℃, the instantaneous high temperature is not higher than 420 ℃, the economic operation temperature is 300-360 ℃, and the working efficiency of the dust removal and denitration device is higher under the condition. High temperature flue gas dust removal denitration integrated device 4 adopts double-deck sealed welded structure and prevents the structure that expands, adopts integration compact structure, reduces the heat radiating area of equipment. SCR denitration catalyst adopts the modularized design, steel structural framework to reduce the time of changing the catalyst, and be convenient for transportation, installation, lift by crane.
The metal film dust removing mechanism 44 is a micro-filter element formed by non-woven laying, overlapping, isostatic pressing and the like by adopting extremely fine metal fiber wires and metal powder and then sintered at high temperature, and has the advantages of high filtering precision, good air permeability, high mechanical strength, corrosion resistance, long service life and suitability for high-temperature use. The dust removal denitration integrated device 4 adopts the cotton heat preservation of glass fiber heat preservation, and thickness is more than or equal to 8mm, can avoid rain and low temperature weather, causes the interior vapor condensation of dust removal denitration device.
For better illustration of the present invention, the following is a detailed description of the working process:
high-temperature flue gas is discharged from the cement pit, passes through a flue gas input channel, reaches the preheater 1, and enters the dedusting and denitration integrated device 4 through a flue under the action of the draught fan 5 to be dedusted and denitrated; after being prepared by the ammonia preparation mechanism 31, the ammonia gas enters the mixer 32 and is sprayed into the flue through the spraying mechanism 33, so that the removal of nitrogen oxides in the flue gas is facilitated, and the denitration of the flue gas is performed; opening an ash discharge valve 432 and a pneumatic gate valve 433, and conveying ash cakes collected in the dedusting and denitration integrated device 4 from an ash hopper 431 to a powder bin 434 through a conveying pipe; after being treated, the flue gas in the dedusting and denitration integrated device 4 enters the waste heat boiler from the flue for waste heat utilization under the action of the draught fan 5, and the high-temperature flue gas performs heat recycling in the waste heat boiler, so that the aims of energy conservation and environmental protection are fulfilled; flue gas from the waste heat boiler enters a pit tail dust remover 7 through a flue, and finally enters a chimney 9 to be discharged under the action of a tail exhaust fan, so that dust removal and denitration treatment of high-temperature flue gas are completed.
The invention has the advantages that: the integrated device has the advantages of simple equipment, high dedusting and denitration efficiency, chemical corrosion resistance, long service life and easiness in maintenance, can achieve a lower pollutant emission effect, consumes lower one-time investment and running cost, and is small in occupied area and simple in management; the application environment is wide, and the product can be normally and continuously used at the temperature below 500 ℃ and in an acidic or alkaline environment; the performance is high, the filtering precision is high, the requirement of 5mg/Nm3 ultra-clean discharge can be met, and the dust removal efficiency is as high as 99%; the high-strength high-pressure-resistance high-strength.
All the electric devices and the controllers matched with the electric devices are installed at the idle position of the device, and the electric devices, the controllers and the matched power supplies are connected through wires by a person skilled in the art, the detailed connection means of the electric devices, the controllers and the matched power supplies are well known in the art, and parts which are not described in the invention are the same as the prior art.
The foregoing illustrates and describes the principles, general features, and advantages of the present invention. It should be understood by those skilled in the art that the above embodiments do not limit the present invention in any way, and all technical solutions obtained by using equivalent alternatives or equivalent variations fall within the scope of the present invention.

Claims (9)

1. The utility model provides a cement kiln high temperature flue gas dust removal denitration integrated device, includes preheater (1), dust removal denitration integrated device (4), exhaust-heat boiler (6), cellar for storing things tail dust remover (7) and chimney (9) that connect gradually through the pipeline according to the flue gas flow direction, its characterized in that, the left end and the top of dust removal denitration integrated device (4) are provided with air inlet and gas outlet respectively, import smoke box (2) and deashing case (45) are connected respectively to air inlet and gas outlet, the top of deashing case (45) is provided with export smoke box (47), be provided with SCR denitration catalyst case (46) between deashing case (45) and export smoke box (47), the inside of dust removal denitration integrated device (4) has set gradually equipartition board (41), guide plate (42) and metal film dust removal mechanism (44) from left to right.
2. The integrated device (4) for dedusting and denitrating high-temperature flue gas of the cement kiln as claimed in claim 1, wherein the inlet smoke box is connected with an ammonia injection system through a pipeline, and the ammonia injection system comprises an ammonia production mechanism (31), a mixer (32) and an injection mechanism (33) which are connected in sequence.
3. The integrated device (4) for dedusting and denitrating high-temperature flue gas of a cement kiln according to claim 1, wherein two ash hoppers (431) are arranged at the bottom of the integrated device (4) for dedusting and denitrating, and the bottom ends of the ash hoppers (431) are connected with a powder bin (434) through a conveying pipe.
4. The integrated device (4) for dedusting and denitrating high-temperature flue gas of a cement kiln according to claim 3, wherein an ash discharge valve (432) and a pneumatic gate valve (433) are arranged on the conveying pipe.
5. The integrated device (4) for dedusting and denitrating high-temperature flue gas of the cement kiln as claimed in claim 1, wherein induced draft fans (5) are arranged between the preheater (1) and the integrated device (4) for dedusting and denitrating, between the integrated device (4) for dedusting and denitrating and the waste heat boiler (6), and between the pit tail deduster (7) and the chimney (9).
6. The integrated device (4) for dedusting and denitrating high-temperature flue gas of the cement kiln as claimed in claim 1, wherein a maintenance mechanism (48) is arranged at the top end of the integrated device (4) for dedusting and denitrating.
7. The integrated device (4) for dedusting and denitrating high-temperature flue gas of a cement kiln as claimed in claim 1, wherein the guide plate (42) is a grid shaped like a Chinese character jing, a double-layer arrangement is adopted, and the plate pages of the guide plate (42) positioned at the top layer are distributed towards two sides by 10 degrees.
8. The integrated device (4) for dedusting and denitrating high-temperature flue gas of a cement kiln as defined in claim 1, wherein the metal film dedusting mechanism (44) adopts extremely fine metal fiber wires and metal powder, and is a micro-filter element formed by non-woven spreading, overlapping, isostatic pressing and the like, and then sintering at high temperature.
9. The integrated device (4) for dedusting and denitrating high-temperature flue gas of the cement kiln as claimed in claim 1, wherein the dedusting and denitrating integrated device (4) is internally insulated by glass fiber insulation cotton, and the thickness of the dedusting and denitrating integrated device is more than or equal to 8 mm.
CN201911232619.4A 2019-12-05 2019-12-05 Cement kiln high temperature flue gas dust removal denitration integrated device Pending CN111013381A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201911232619.4A CN111013381A (en) 2019-12-05 2019-12-05 Cement kiln high temperature flue gas dust removal denitration integrated device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201911232619.4A CN111013381A (en) 2019-12-05 2019-12-05 Cement kiln high temperature flue gas dust removal denitration integrated device

Publications (1)

Publication Number Publication Date
CN111013381A true CN111013381A (en) 2020-04-17

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Country Status (1)

Country Link
CN (1) CN111013381A (en)

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