CN111530252A - Be used for ultralow discharge system of lime rotary kiln flue gas desulfurization dust removal denitration - Google Patents

Be used for ultralow discharge system of lime rotary kiln flue gas desulfurization dust removal denitration Download PDF

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Publication number
CN111530252A
CN111530252A CN202010450052.4A CN202010450052A CN111530252A CN 111530252 A CN111530252 A CN 111530252A CN 202010450052 A CN202010450052 A CN 202010450052A CN 111530252 A CN111530252 A CN 111530252A
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China
Prior art keywords
pipeline
rotary kiln
dust
denitration
desulfurization
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CN202010450052.4A
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Chinese (zh)
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姚磊
贾纪强
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Jiangsu Shiqing Environmental Protection Technology Co ltd
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Jiangsu Shiqing Environmental Protection Technology Co ltd
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Priority to CN202010450052.4A priority Critical patent/CN111530252A/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
    • B01D53/75—Multi-step 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
    • B01D53/48—Sulfur compounds
    • B01D53/50—Sulfur oxides
    • B01D53/508—Sulfur oxides by treating the gases with solids
    • 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
    • B01D53/81—Solid phase processes
    • 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
    • B01D53/8621—Removing nitrogen compounds
    • B01D53/8625—Nitrogen oxides
    • B01D53/8631—Processes characterised by a specific device
    • 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
    • B01D53/90—Injecting reactants
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES 
    • F23J15/00—Arrangements of devices for treating smoke or fumes
    • F23J15/003—Arrangements of devices for treating smoke or fumes for supplying chemicals to fumes, e.g. using injection devices
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES 
    • F23J15/00—Arrangements of devices for treating smoke or fumes
    • F23J15/02—Arrangements of devices for treating smoke or fumes of purifiers, e.g. for removing noxious material
    • F23J15/022—Arrangements of devices for treating smoke or fumes of purifiers, e.g. for removing noxious material for removing solid particulate material from the gasflow
    • F23J15/025—Arrangements of devices for treating smoke or fumes of purifiers, e.g. for removing noxious material for removing solid particulate material from the gasflow using filters
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES 
    • F23J15/00—Arrangements of devices for treating smoke or fumes
    • F23J15/02—Arrangements of devices for treating smoke or fumes of purifiers, e.g. for removing noxious material
    • F23J15/022—Arrangements of devices for treating smoke or fumes of purifiers, e.g. for removing noxious material for removing solid particulate material from the gasflow
    • F23J15/027—Arrangements of devices for treating smoke or fumes of purifiers, e.g. for removing noxious material for removing solid particulate material from the gasflow using cyclone separators
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES 
    • F23J15/00—Arrangements of devices for treating smoke or fumes
    • F23J15/06—Arrangements of devices for treating smoke or fumes of coolers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2251/00—Reactants
    • B01D2251/20—Reductants
    • B01D2251/206—Ammonium compounds
    • B01D2251/2062—Ammonia
    • 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
    • Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
    • Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
    • Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters
    • Y02A50/2351—Atmospheric particulate matter [PM], e.g. carbon smoke microparticles, smog, aerosol particles, dust

Abstract

The invention relates to a flue gas desulfurization, dust removal and denitration ultralow emission system for a lime rotary kiln, which comprises a rotary kiln and a preheaterThe system comprises a cyclone dust collector, SDS dry desulfurization equipment, a bag-type dust collector, medium-low temperature SCR denitration equipment and a draught fan; the method comprises the steps of preheating flue gas generated by a rotary kiln through a preheater, removing large-particle dust in smoke dust through a cyclone dust collector, performing desulfurization and drying through SDS dry-process desulfurization equipment, sequentially performing dust removal and denitration through a bag-type dust collector and medium-low-temperature SCR denitration equipment, discharging the flue gas through a draught fan, and finally discharging the flue gas through a chimney. The flue gas can contain dust and SO after being treated2、NOXAnd the final emission concentration of harmful substances reaches: SO (SO)2≤35mg/Nm3，NOx≤50mg/Nm3Dust is less than or equal to 5mg/Nm3(ii) a The treated smoke is discharged into the atmosphere, so that the environment is not polluted, the human health is prevented from being damaged, the growth of animals and plants is protected, and the atmospheric environment is protected.

Description

Be used for ultralow discharge system of lime rotary kiln flue gas desulfurization dust removal denitration
Technical Field
The invention relates to the technical field of lime industrial waste gas purification treatment, in particular to an ultralow emission system for desulfurization, dust removal and denitration of flue gas of a lime rotary kiln.
Background
The lime rotary kiln belongs to large rotary cylinder type high-temperature calcining equipment, and is mainly a process for physically or mechanically treating required materials in an industrial process, and then a calcining process of the lime rotary kiln can cause a series of chemical changes to occur inside the lime rotary kiln, so that a required lime product is obtained.
At present, with the enhancement of environmental awareness of people, the national emission standard of pollutants for enterprises is higher and higher, the measures of the enterprises for treating the pollutants are also increased, wherein the treatment of the flue gas of the industrial kiln is also more and more emphasized, and the production process of the lime rotary kiln can generate dust and SO2、NOXSmoke of harmful substances, and the like, wherein the smoke can cause serious pollution to the environment when being discharged into the atmosphere, and the smoke can cause certain harm to human bodies and mainly has respiratory tract infection under serious conditions; SO (SO)2The survival of animals and plants can be influenced, sculptures and buildings can be damaged, and economic loss is caused; NOx reacts with organic compounds to form photochemical smog, which seriously pollutes the atmosphere and causes lung injury and lung function reduction to adults and children suffering from lung diseases, thus harming human health. Therefore, the invention provides an ultralow emission system suitable for treating the flue gas of the lime rotary kiln, which can ensure that the final emission concentration of the flue gas of the lime rotary kiln reaches: SO (SO)2≤35mg/Nm3，NOx≤50mg/Nm3Dust is less than or equal to 5mg/Nm3。
Disclosure of Invention
The invention aims to solve the defects in the prior art, and provides an ultralow emission system for desulfurization, dust removal and denitration of flue gas of a lime rotary kiln.
In order to achieve the purpose, the invention adopts the following technical scheme: the utility model provides a be used for lime rotary kiln flue gas desulfurization dust removal denitration minimum discharge system, includes rotary kiln, pre-heater, cyclone, SDS dry desulfurization equipment, sack cleaner, well low temperature SCR denitration equipment, draught fan, produce the flue gas in the rotary kiln production process, the export of rotary kiln through first pipeline with the pre-heater is connected, cyclone lateral part entry pass through the second pipeline with the pre-heater links to each other, after the cyclone removes dust through the top export pass through the third pipeline with SDS dry desulfurization equipment is connected, the sack cleaner entry pass through the fourth pipeline with SDS dry desulfurization equipment lateral part links to each other, the sack cleaner export pass through the fifth pipeline with well low temperature SCR denitration equipment is connected, well low temperature SCR denitration equipment pass through the sixth pipeline with the draught fan links to each other.
Preferably, the rotary kiln is in a hollow cylindrical shape, a supporting wheel is arranged at the bottom of the rotary kiln, the supporting wheel is provided with a wheel belt which rotates correspondingly, and a gear is arranged outside the rotary kiln.
Preferably, the rotary kiln through first pipeline with the preheater bottom links to each other, there is the feed bin preheater top, the feed bin both ends are the round platform body, and the centre is the cylinder, the preheater below install with the connecting line that the rotary kiln links to each other.
Preferably, the cyclone dust collector comprises a cylindrical part, a conical part and a dust collecting chamber, the top of the cyclone dust collector is the cylindrical part, the top of the cylindrical part is provided with an outlet, and the side of the cylindrical part is provided with an inlet; the dust collecting chamber is a cuboid, the conical part is communicated with the interior of the cylindrical part, and the dust collecting chamber is communicated with the interior of the conical part.
Preferably, the SDS dry desulphurization device comprises an ultrafine grinding machine, a desulphurization conveying device and an absorption tower, wherein an outlet at the bottom of the ultrafine grinding machine is connected with the desulphurization conveying device through a seventh pipeline, the desulphurization conveying device is connected with an inlet at the bottom of the absorption tower through an eighth pipeline, and an outlet is arranged on the side edge of the top of the absorption tower.
Preferably, the sack cleaner includes dust collector, pulse valve, deashing structure, filter bag, ash bucket, row's ash structure in advance, dust collector is in advance sack cleaner side entry below, the pulse valve is in the top of deashing structure, the filter bag is in the below of deashing structure, the ash bucket is in the below of filter bag, ash bucket lower part has row's ash structure, the ash bucket is the cone shape.
Preferably, the medium-low temperature SCR denitration device includes an SCR reactor and a catalyst regeneration device, the SCR reactor includes a catalyst layer and a rectification grid, the catalyst layer is above the rectification grid, the SCR reactor is connected with the catalyst regeneration device through a ninth pipeline via a bottom side outlet, and the catalyst regeneration device is connected with a side inlet of the SCR reactor through a tenth pipeline via a top outlet.
Preferably, the medium-low temperature SCR denitration device further includes a storage device, a denitration agent conveying device, an evaporation device, and an ammonia gas injector, the storage device is connected to the denitration agent conveying device through an eleventh pipeline via a bottom side outlet, the denitration agent conveying device is connected to the evaporation device through a twelfth pipeline, the evaporation device is connected to the ammonia gas injector through a thirteenth pipeline via a bottom outlet, a side inlet of the ammonia gas injector is connected to an outlet of the bag-type dust collector through a fifth pipeline, and a side outlet of the ammonia gas injector is connected to the SCR reactor through a fourteenth pipeline.
Preferably, still include the chimney, the draught fan combustion gas passes through the chimney emission, the chimney passes through the tail gas union coupling the draught fan.
Compared with the prior art, the invention has the beneficial effects that: (1) the flue gas can be treated to contain dust and SO2、NOXAnd the final emission concentration of harmful substances reaches: SO (SO)2≤35mg/Nm3，NOx≤50mg/Nm3Dust is less than or equal to 5mg/Nm3(ii) a (2) The treated smoke is discharged into the atmosphere, does not pollute the environment, avoids the human health from being damaged, and protects animals and plantsThe growth of the seed crystal can protect the atmospheric environment.
Drawings
FIG. 1 is a structural schematic diagram of a system for desulfurization, dust removal and denitration of flue gas of a rotary lime kiln according to the present invention;
FIG. 2 is a schematic view of the piping structure of the present invention;
in the figure: a rotary kiln-1; a preheater-2; a cyclone dust collector-3; SDS dry desulfurization equipment-4; bag dust collector-5; medium and low temperature SCR denitration equipment-6; an induced draft fan-7; a chimney-8.
Detailed Description
In order to further understand the objects, structures, features and functions of the present invention, the following embodiments are described in detail.
Example 1: referring to fig. 1, the ultralow emission system for desulfurization, dust removal and denitration of lime rotary kiln flue gas of the present invention comprises a rotary kiln 1, a preheater 2, a cyclone dust collector 3, a SDS dry desulfurization device 4, a bag-type dust collector 5, a medium and low temperature SCR denitration device 6, and a draught fan 7, wherein flue gas is generated in the production process of the rotary kiln 1, an outlet of the rotary kiln 1 is connected with the preheater 2 through a first pipeline 101, an inlet at the side of the cyclone dust collector 3 is connected with the preheater 2 through a second pipeline 201, the cyclone dust collector 3 removes dust and is connected with the SDS dry desulfurization device 4 through a top outlet through a third pipeline 301, an inlet of the bag-type dust collector 5 is connected with the side of the SDS dry desulfurization device 4 through a fourth pipeline 401, and an outlet of the bag-type dust collector 5 is connected with the medium and low temperature SCR denitration device 6 through a fifth, and the flue gas after handling passes through sixth pipeline 601 warp draught fan 7 discharges, draught fan 7 pass through tail gas pipe 701 with chimney 8 is connected, and final flue gas passes through chimney 8 discharges.
Preferably, the rotary kiln 1 is in a hollow cylindrical structure, a supporting roller 11 is arranged at the bottom of the rotary kiln 1, on one hand, the supporting roller 11 supports the whole weight of the rotary kiln 1, on the other hand, the supporting roller 11 has a positioning effect on the rotary kiln 1, the supporting roller 11 is provided with a roller belt 12 which rotates correspondingly, a gear 13 is arranged outside the rotary kiln 1, the gear can enable the gear 13 and a kiln cylinder body to leave enough heat dissipation space, and the supporting roller 11 also has a certain damping and buffering effect, so that the service life of the rotary kiln 1 is prolonged, and the supporting roller 11 mainly supports and bears the whole weight of the rotary kiln 1; the flue gas generated by the rotary kiln 1 is discharged into the preheater 2.
Preferably, the rotary kiln 1 is connected with the bottom of the preheater 2 through a first pipeline 101, a bin 21 is arranged at the top of the preheater 2, two ends of the bin 21 are truncated cone bodies, the middle of the bin is a cylinder, and a connecting pipeline 202 connected with the rotary kiln 1 is arranged below the preheater 2; the preheater 2 fully utilizes the waste heat of the flue gas discharged by the rotary kiln 1 to heat the raw material in the storage bin 21, so that the temperature of the flue gas discharged by the rotary kiln 1 is rapidly reduced, the temperature of the raw material is rapidly increased, and the heat consumption is reduced.
Preferably, the cyclone dust collector 3 comprises a cylindrical part 31, a conical part 32 and a dust collecting chamber 33, the top of the cyclone dust collector 3 is the cylindrical part 31, the top of the cylindrical part 31 is provided with an outlet, and the side is provided with an inlet; the conical part 32 is arranged below the cylindrical part 31, the dust collecting chamber 33 is arranged below the conical part 32, the dust collecting chamber 33 is a cuboid, the conical part 32 is communicated with the inside of the cylindrical part 31, and the dust collecting chamber 33 is communicated with the inside of the conical part 32; the cyclone dust collector 3 receives the flue gas treated by the preheater 2, the flue gas separates dust from air flow under the action of centrifugal force by the cyclone dust collector 3 and collects the dust on the wall of the device, then dust particles fall into the conical part 32 under the action of gravity, and then the dust particles are discharged outside through the dust collecting chamber 33, and the cyclone dust collector 3 mainly removes large-particle dust in the flue gas; the cyclone dust collector 3 separates large particle dust from gas by using centrifugal force generated by the rotating dust-containing gas flow, when the dust-containing flue gas enters the cyclone dust collector 3, the gas flow changes from linear motion to circular motion, and most of the gas flow spirally flows downwards along the wall and the cylinder part 31 and flows towards the cone 32.
Preferably, the SDS dry desulfurization device 4 comprises an ultra-fine grinding mill 41, a desulfurization conveying device 42 and an absorption tower 43, wherein the bottom outlet of the ultra-fine grinding mill 41 is connected with the desulfurization conveying device 42 through a seventh pipeline 402, and the desulfurization conveying device 42 is connected with an eighth pipeline 403An inlet at the bottom of the absorption tower 43, and an outlet at the top side of the absorption tower 43; the flue gas discharged from the cyclone dust collector 3 enters the absorption tower 43, the desulfurizer is added into the superfine grinding machine 41, the desulfurizer with about 200 meshes is ground into 1000 meshes of 800-2When acidic substances are absorbed and purified, the desulfurizing agent can remove SO contained in flue gas2Fully adsorbing SO in the flue gas after adsorption2Concentration of < 35mg/Nm3。
Preferably, the bag-type dust collector 5 comprises a pre-dust collector 51, a pulse valve 52, an ash removal structure 53, a filter bag 54, an ash bucket 55 and an ash discharge structure 56, wherein the pre-dust collector 51 is arranged below an inlet on the side edge of the bag-type dust collector 5, the pulse valve 52 is arranged above the ash removal structure 53, the filter bag 54 is arranged below the ash removal structure 53, the ash bucket 55 is arranged below the filter bag 54, the ash discharge structure 56 is arranged at the lower part of the ash bucket 55, and the ash bucket 55 is in a conical shape; the flue gas desulfurized by the SDS dry desulfurization device 4 is discharged into the bag-type dust remover 5, the flue gas enters the pre-dust removal device, so that coarse particle dust in the flue gas directly flows into the dust hopper 55 to play a role of pre-dust removal, simultaneously the dust removal load of the bag-type dust remover 5 is reduced, gas-solid separation and flue gas purification are carried out, the flue gas entering the dust hopper 55 is folded upwards to pass through the filter bag 54 with a metal framework inside, dust is collected on the outer surface of the filter bag 54, the purified gas enters the dust removal structure 53 at the upper part of the filter bag 54 and is collected to the outlet of the bag-type dust remover 5 to be discharged, in the process of purifying the dust-containing gas by the filter bag 54, the dust deposited on the filter bag is increased along with the increase of time, the resistance of the filter bag 54 is increased, the working efficiency is reduced, the filter bag 54 must be subjected to dust removal, the pulse valve 52 is opened during, the dust accumulated on the surface of the filter bag 54 falls off, the filter bag 54 returns to the original state, the dust falling off from the filter bag 54 falls into the dust hopper 55, and the dust passes throughThe ash discharging structure 56 discharges the machine body, ensures the normal operation of a cloth bag dust removing system, realizes the collection of the desulfurized ash and the standard discharge of the concentration of the dust at the outlet, and ensures that the dust in the flue gas is less than 5mg/Nm3And the harm to the respiratory tract infection of a human body can be reduced due to the lower dust content.
Preferably, the medium-low temperature SCR denitration device 6 includes an SCR reactor 65 and a catalyst regeneration device 66, the SCR reactor 65 includes a catalyst layer 651 and a rectification grid 652, the catalyst layer 651 is above the rectification grid 652, the SCR reactor 65 is connected to the catalyst regeneration device 66 through a ninth pipe 602 via a bottom side outlet, the catalyst regeneration device 66 is connected to a side inlet of the SCR reactor 65 through a top outlet via a tenth pipe 603, the catalyst regeneration device is provided with a hot air system to generate hot flue gas of 500 ℃ to 700 ℃, the hot flue gas of 600 ℃ is generated by adding, the clean flue gas with low oxygen content after denitration in the SCR reactor 65 is regenerated, and the regenerated catalyst enters the SCR reactor 65 through a tenth pipe 603 via a top inlet of the SCR reactor.
Preferably, the medium-low temperature SCR denitration device 6 further includes a storage device 61, a denitration agent delivery device 63, an evaporation device 62 and an ammonia injector 64, the storage device 61 is connected with the denitration agent delivery device 63 through an eleventh pipeline 604 via a bottom side outlet, the denitration agent delivery device 63 is connected with the evaporation device 62 through a twelfth pipeline 605, the evaporation device 62 is connected with the ammonia injector 64 through a thirteenth pipeline 606 via a bottom outlet, a side inlet of the ammonia injector 64 is connected with an outlet of the bag-type dust collector 5 through a fifth pipeline 501, and a side outlet of the ammonia injector 64 is connected with the SCR reactor 65 through a fourteenth pipeline 607; the denitration agent is stored in the storage device 61 and is conveyed to the denitration agent conveying device 63 through an eleventh pipeline 604, the denitration agent conveying device 63 conveys the denitration agent to the evaporation device 62, the evaporation device 62 conveys the gasified denitration agent into the ammonia gas injector 64 through a thirteenth pipeline through a bottom outlet, and the gasified denitration agent and the NH sprayed by the ammonia gas injector 643Mixed with each other and containing NOXFlue gas channelEntering the ammonia gas injector 64 after dust removal; the ammonia injector 64 is connected to the SCR reactor 65 via a fourteenth line 607, and NO in the flue gasXThe catalyst layer 651 reacts with NH3 to generate N under the action of a catalyst2And H2And O, so that the aim of removing nitrogen oxides is fulfilled, and the flue gas after denitration is discharged into the induced draft fan 7 through a sixth pipeline 601.
Preferably, still include chimney 8, the gas that draught fan 7 gas was discharged through chimney 8, chimney 8 passes through tail gas pipe 701 and connects draught fan 7.
Preferably, the bag-type dust collector 5 will contain NOXThe flue gas is conveyed to the medium-low temperature SCR denitration device 6 through a fifth pipeline 501, and the medium-low temperature SCR denitration device 6 is subjected to catalytic denitration to remove NOXThe catalyst can accelerate the reaction time of the medium-low temperature SCR denitration equipment 6, and reduce the photochemical smog formed by nitrogen oxides, thereby causing pollution to the atmosphere and damage to human health.
Example 2: referring to fig. 2, fig. 2 is a schematic view of a pipeline structure according to the present invention; one end of a first pipeline 101 of the rotary kiln is connected with the rotary kiln 1, and the other end of the first pipeline is connected with the preheater 2; one end of the second pipeline 201 is connected with the preheater, and the other end of the second pipeline is connected with the cyclone dust collector 3; one end of a third pipeline 301 is connected with the cyclone dust collector 3, and the other end is connected with the SDS dry desulphurization device 4; one end of a fourth pipeline 401 is connected with the SDS dry desulphurization device 4, and the other end is connected with the bag-type dust remover 5; one end of a fifth pipeline 501 is connected with the bag-type dust collector 5, and the other end of the fifth pipeline is connected with the medium-low temperature SCR denitration device 6; one end of a sixth pipeline 601 is connected with the medium-low temperature SCR denitration device 6, and the other end of the sixth pipeline is connected with the induced draft fan 7; one end of a seventh pipeline 402 is connected with the superfine grinding machine 41, and the other end is connected with the desulfurization conveying equipment 42; one end of the eighth pipeline 403 is connected with the desulfurization conveying equipment 42, and the other end is connected with the bottom of the absorption tower 43; a ninth pipe 602 is connected to the SCR reactor 65 at one end and to the catalyst regeneration device 66 at the other end; one end of a tenth pipeline 603 is connected with the catalyst regeneration device 66, and the other end is connected with the top inlet of the SCR reactor 65; one end of an eleventh pipeline 604 is connected with the storage device 61, and the other end of the eleventh pipeline is connected with the denitration agent conveying device 63; one end of a twelfth pipeline 605 is connected with the denitrating agent conveying equipment 63, and the other end is connected with the evaporation equipment 62; a thirteenth pipe 606 has one end connected to the evaporation apparatus 62 and the other end connected to the ammonia gas injector 64; a fourteenth pipe 607 is connected to the ammonia injector 64 at one end and to the SCR reactor 65 at the other end; one end of the tail gas pipe 701 is connected with the induced draft fan 7, and the other end of the tail gas pipe is connected with the chimney 8; one end of the connecting pipeline 202 is connected with the preheater 2, and the other end is connected with the first pipeline 101.
According to the system for the desulfurization, dust removal and denitration of the flue gas of the rotary lime kiln, disclosed by the invention, the flue gas can be treated to contain dust and SO2、NOXAnd the final emission concentration of harmful substances reaches: SO (SO)2≤35mg/Nm3，NOx≤50mg/Nm3Dust is less than or equal to 5mg/Nm3(ii) a The treated smoke is discharged into the atmosphere, so that the environment is not polluted, the human health is prevented from being damaged, the growth of animals and plants is protected, and the atmospheric environment is protected.
The present invention has been described in relation to the above embodiments, which are only exemplary of the implementation of the present invention. It should be noted that the disclosed embodiments do not limit the scope of the invention. Rather, it is intended that all such modifications and variations be included within the spirit and scope of this invention.

Claims (9)

1. A flue gas desulfurization, dust removal and denitration ultralow emission system for a lime rotary kiln is characterized by comprising a rotary kiln, a preheater, a cyclone dust collector, SDS dry desulfurization equipment, a bag-type dust collector, medium and low temperature SCR denitration equipment and an induced draft fan, the outlet of the rotary kiln is connected with the preheater through a first pipeline, the inlet at the side part of the cyclone dust collector is connected with the preheater through a second pipeline, the cyclone dust collector is connected with the SDS dry-process desulfurization equipment through a third pipeline after dust removal through the outlet at the top part, the inlet of the bag-type dust collector is connected with the side part of the SDS dry-method desulfurization device through a fourth pipeline, an outlet of the bag-type dust collector is connected with the medium-low-temperature SCR denitration device through a fifth pipeline, and the medium-low-temperature SCR denitration device is connected with the induced draft fan through a sixth pipeline.
2. The system as claimed in claim 1, wherein the rotary kiln is hollow cylindrical in structure, the rotary kiln has a bottom supporting wheel with a corresponding rotary belt, and the rotary kiln is externally provided with gears.
3. The system of claim 1, wherein the rotary kiln is connected to the bottom of the preheater through a first pipeline, the top of the preheater is provided with a bin, the two ends of the bin are truncated cones, the middle of the bin is a cylinder, and a connecting pipeline connected to the rotary kiln is installed below the preheater.
4. The system for desulfurization, dust removal and denitration of flue gas of a lime rotary kiln as claimed in claim 1, wherein the cyclone dust collector comprises a cylindrical part, a conical part and a dust collecting chamber, the top of the cyclone dust collector is the cylindrical part, the top of the cylindrical part is provided with an outlet, and the side of the cylindrical part is provided with an inlet; the dust collecting chamber is a cuboid, the conical part is communicated with the interior of the cylindrical part, and the dust collecting chamber is communicated with the interior of the conical part.
5. The system for desulfurization, dust removal and denitration of flue gas of a rotary lime kiln as claimed in claim 1, wherein the SDS dry desulfurization device comprises an ultra-fine grinding machine, a desulfurization conveying device and an absorption tower, an outlet at the bottom of the ultra-fine grinding machine is connected with the desulfurization conveying device through a seventh pipeline, the desulfurization conveying device is connected with an inlet at the bottom of the absorption tower through an eighth pipeline, and an outlet is arranged at the side edge of the top of the absorption tower.
6. The system as claimed in claim 1, wherein the bag-type dust remover comprises a pre-dust removing device, a pulse valve, a dust removing structure, a filter bag, an ash bucket and an ash discharging structure, the pre-dust removing device is arranged below an inlet at the side of the bag-type dust remover, the pulse valve is arranged above the dust removing structure, the filter bag is arranged below the dust removing structure, the ash bucket is arranged below the filter bag, the ash discharging structure is arranged at the lower part of the ash bucket, and the ash bucket is in a conical shape.
7. The system for desulfurization, dust removal and denitration of flue gas of a lime rotary kiln as claimed in claim 1, wherein the medium-low temperature SCR denitration device comprises an SCR reactor and a catalyst regeneration device, the SCR reactor comprises a catalyst layer and a rectification grid, the catalyst layer is arranged above the rectification grid, the SCR reactor is connected with the catalyst regeneration device through a ninth pipeline via a bottom side outlet, and the catalyst regeneration device is connected with a side inlet of the SCR reactor through a tenth pipeline via a top outlet.
8. The system for desulfurization, dust removal and denitration of flue gas of a lime rotary kiln as recited in claim 1, wherein the medium-low temperature SCR denitration device further comprises a storage device, a denitration agent delivery device, an evaporation device and an ammonia gas injector, the storage device is connected with the denitration agent delivery device through an eleventh pipeline via a bottom side outlet, the denitration agent delivery device is connected with the evaporation device through a twelfth pipeline, the evaporation device is connected with the ammonia gas injector through a thirteenth pipeline via a bottom outlet, a side inlet of the ammonia gas injector is connected with an outlet of the bag-type dust collector through a fifth pipeline, and a side outlet of the ammonia gas injector is connected with the SCR reactor through a fourteenth pipeline.
9. The system for desulfurization, dust removal and denitration of flue gas of a lime rotary kiln as claimed in claim 1, further comprising a chimney, wherein gas discharged from the induced draft fan is discharged through the chimney, and the chimney is connected with the induced draft fan through a tail gas pipe.
CN202010450052.4A 2020-05-25 2020-05-25 Be used for ultralow discharge system of lime rotary kiln flue gas desulfurization dust removal denitration Pending CN111530252A (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112546848A (en) * 2020-11-20 2021-03-26 盐城市兰丰环境工程科技有限公司 Dry desulfurization equipment of lime rotary kiln
LU501563A1 (en) * 2022-03-01 2022-09-01 Yancheng City Lan Feng Env Engineering Co Ltd Dry desulfurization equipment of lime rotary kiln

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112546848A (en) * 2020-11-20 2021-03-26 盐城市兰丰环境工程科技有限公司 Dry desulfurization equipment of lime rotary kiln
CN112546848B (en) * 2020-11-20 2021-12-21 盐城市兰丰环境工程科技有限公司 Dry desulfurization equipment of lime rotary kiln
WO2022104767A1 (en) * 2020-11-20 2022-05-27 盐城市兰丰环境工程科技有限公司 Dry desulphurization apparatus for lime rotary kiln
LU501563A1 (en) * 2022-03-01 2022-09-01 Yancheng City Lan Feng Env Engineering Co Ltd Dry desulfurization equipment of lime rotary kiln

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