CN113230857A - Post-treatment system of steel rolling heating furnace and post-treatment process thereof - Google Patents
Post-treatment system of steel rolling heating furnace and post-treatment process thereof Download PDFInfo
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- CN113230857A CN113230857A CN202110521985.2A CN202110521985A CN113230857A CN 113230857 A CN113230857 A CN 113230857A CN 202110521985 A CN202110521985 A CN 202110521985A CN 113230857 A CN113230857 A CN 113230857A
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- 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
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- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
- B01D46/02—Particle separators, e.g. dust precipitators, having hollow filters made of flexible material
- B01D46/023—Pockets filters, i.e. multiple bag filters mounted on a common frame
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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
- B01D53/46—Removing components of defined structure
- B01D53/48—Sulfur compounds
- B01D53/50—Sulfur oxides
- B01D53/508—Sulfur oxides by treating the gases with solids
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
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- 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
- B01D53/83—Solid phase processes with moving reactants
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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
- B01D53/8621—Removing nitrogen compounds
- B01D53/8625—Nitrogen oxides
- B01D53/8631—Processes characterised by a specific device
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- 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
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- 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
- F27D17/001—Extraction of waste gases, collection of fumes and hoods used therefor
- F27D17/002—Details of the installations, e.g. fume conduits or seals
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- 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
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- 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
- B01D2258/025—Other waste gases from metallurgy plants
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- 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
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- 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
- F27D2017/006—Systems for reclaiming waste heat using a boiler
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Abstract
The invention relates to a post-treatment system of a steel rolling heating furnace and a post-treatment process thereof. The system device solves the problems that the existing steel rolling heating furnace desulfurization and denitration equipment is unsatisfactory in flue gas desulfurization and denitration effect, cannot meet the environmental protection requirement and has certain danger in the production process.
Description
Technical Field
The invention relates to the technical field of industrial flue gas treatment, in particular to a post-treatment system and a post-treatment process for a steel rolling heating furnace.
Background
With the development and progress of the times, the nation advocates to vigorously develop industrialization to meet the increasing material requirements of people, and with the continuous promotion of the industrialization process of China, the defects generated in the industrialization development process are gradually revealed, for example, the industrialization development brings serious atmospheric pollution and acid rain. This is because in industrial production, industries such as coal burning, steel and the like emit a large amount of smoke and harmful gases, such as sulfur dioxide and various nitrogen-containing compounds. SO in recent years2NOx pollution has even surpassed soot pollution as the first major pollutant in atmospheric pollution. In order to achieve economic sustainable development, the nation proposes a novel industrialization concept, the pollution treatment intensity is continuously increased, and the environmental protection discharge standard is more and more strict.
The heating furnace is used as key equipment in the steel rolling process, generally adopts blast furnace gas or mixed gas as fuel, and can produce particulate matters and SO in the production process2And harmful substances such as NOx cause environmental pollution and cannot meet the latest national or local emission standard, so that the efficient purification of the smoke pollutants of the steel rolling heating furnace is very important.
The flue gas of steel rolling heating furnace divide into air smoke side flue gas and coal smoke side flue gas, steel rolling heating furnace SOx/NOx control equipment among the prior art is difficult to satisfy air smoke side flue gas and coal smoke side flue gas purification emission requirement, and when coal smoke side flue gas and high temperature flue gas direct contact, take place chemical reaction easily, cause the incident, cause certain threat to site work personnel personal safety, consequently, technical staff in the field provides a steel rolling heating furnace after-treatment system and aftertreatment technology, in order to solve above-mentioned problem.
Disclosure of Invention
The invention aims to provide a post-treatment system and a post-treatment process of a steel rolling heating furnace, aims to solve the problems that in the prior art, flue gas desulfurization and denitrification effects of desulfurization and denitrification equipment of the steel rolling heating furnace are not ideal, environmental protection requirements cannot be met, and a certain risk exists in the production process, and provides a dry-method pin removal device and a process of the steel rolling heating furnace.
In order to achieve the purpose, the invention provides the following technical scheme: a steel rolling heating furnace post-treatment system comprises a soot side flue gas channel and an air flue side flue gas channel which are respectively led out from a flue gas outlet of a steel rolling heating furnace, and is characterized in that the soot side flue gas channel and the air flue side flue gas channel are arranged along the flow direction of a flue, and a soot side primary heat exchanger, a soot side secondary heat exchanger, a first denitration device, a first desulfurization device, a first bag-type dust remover, a first induced draft fan and a first chimney are sequentially connected to the side of the soot side flue gas channel from the flue gas inlet direction to the flue gas outlet direction;
the air-smoke-side flue gas channel side is sequentially connected with an air-smoke-side heat exchanger, a heat supplementing device, a second denitration device, a second desulfurization device, a second bag-type dust collector, a second induced draft fan and a second chimney from the flue gas inlet direction to the flue gas outlet direction;
the flue gas outlet end of the first-stage heat exchanger at the soot side is connected with the flue gas inlet end of the second-stage heat exchanger at the soot side through a flue, the heat exchange inlet end of the second-stage heat exchanger at the soot side is connected with a hot blast stove through a pipeline, the hot blast stove penetrates through the second-stage heat exchanger at the soot side and is connected with a heat supply device through a pipeline, the flue gas outlet end of the second-stage heat exchanger at the soot side is connected with the flue gas inlet end of a first denitration device through a flue, the flue is connected with a first denitration agent injection device through a leading-out pipeline, the outlet end of the first denitration agent injection device is connected with the flue gas inlet end of the first-stage heat exchanger at the soot side through a flue, the flue gas channel at the soot side penetrates through the first-stage heat exchanger at the soot side, and the hot flue gas outlet end of the first-stage heat exchanger at the soot side is connected with the flue gas inlet end of a first desulfurization device through a flue, the first desulfurization device is characterized in that a flue gas outlet end of the first desulfurization device is connected with a flue gas inlet end of a first bag-type dust collector through a flue, the flue gas outlet end of the first bag-type dust collector is connected with a flue gas inlet end of a first induced draft fan through a flue, and the flue gas outlet end of the first induced draft fan is connected with a first chimney through a flue;
the utility model discloses a flue gas inlet end of air smoke side heat exchanger is connected with concurrent heating device, including air flue, air flue side heat exchanger flue gas outlet end, concurrent heating device, second denitration agent injection apparatus, second denitration device flue gas inlet end, second desulfurization system flue gas inlet end, second desulfurization device flue gas outlet end, second sack cleaner device flue gas inlet end, second sack cleaner flue gas outlet end, second draught fan flue gas outlet end is connected with the second chimney through the flue.
Further, the heat exchange unit of the coal smoke side one-level heat exchanger is placed vertically, a rotary heat storage device is arranged in the coal smoke side one-level heat exchanger and connected with a driving device through a bearing, a cold smoke inlet end and a hot smoke outlet end of the coal smoke side one-level heat exchanger are arranged below the coal smoke side one-level heat exchanger, the cold smoke inlet end and the hot smoke outlet end are symmetrically distributed, the cold smoke outlet end and the hot smoke inlet end of the coal smoke side one-level heat exchanger are arranged above the coal smoke side one-level heat exchanger, and the cold smoke outlet end and the hot smoke inlet end are symmetrically distributed.
Further, the inside design of soot side secondary heat exchanger and empty smoke side heat exchanger is the same, soot side secondary heat exchanger and empty smoke side heat exchanger all include board core group, box, flue gas import and export connecting tube and heat transfer pipeline, board core group carries out fixed connection by the polar plate through the welding and forms, the board core group outside is equipped with the box that has sealed and supporting role, be equipped with flue gas inlet, exhanst gas outlet connecting tube and heat transfer pipeline in the board core group, flue gas inlet connecting tube is connected with the cold flue gas exit end of soot side one-level heat exchanger, exhanst gas outlet connecting tube is connected with first denitrification facility flue gas inlet end, heat transfer pipeline is connected with the hot-blast furnace.
Further, first denitration agent injection apparatus and second denitration agent injection apparatus internal design are the same, first denitration agent injection apparatus and second denitration agent injection apparatus all include that the denitration agent stores and conveyor, denitration agent stores and conveyor has denitration agent evaporation plant through the pipe connection, denitration agent evaporation plant is connected with first denitration device and second denitration device respectively through the flue, and is equipped with static mixing device and flue gas guiding device along the exhanst gas outlet direction in the flue.
Still further, the denitrifier is ammonia water, and an ammonia water leakage detection device is arranged in the denitrifier evaporation device.
Further, first denitrification facility and second denitrification facility internal design are the same, first denitrification facility and second denitrification facility all include the denitration reactor, upper flue gas inlet department is equipped with the distribution of air flow device in the denitration reactor, distribution of air flow device below is equipped with a multilayer supporting beam, a supporting beam surface has placed the catalyst, the denitration reactor surface evenly is equipped with a plurality of manhole doors corresponding with the catalyst, the denitration reactor outside is equipped with overhauls the platform, it is connected with stair to overhaul the platform through welded fastening.
Still further, an ash removal device connected with the inner wall of the denitration reactor is arranged above the catalyst, and an ash storage device is arranged below the catalyst and at the bottom of the denitration reactor.
Furthermore, the internal design of the first desulfurization device is the same as that of the second desulfurization device, the first desulfurization device and the second desulfurization device respectively comprise a desulfurizer feeding device, a desulfurizer grinding and conveying device and an injection device, the desulfurizer feeding device is connected with the desulfurizer grinding and conveying device, the desulfurizer grinding and conveying device is connected with the injection device through a pipeline, and the injection device is connected with a flue through a pipeline.
Still further, the system also comprises an online monitoring control system arranged at the smoke flowing position.
A post-treatment process of a steel rolling heating furnace comprises the following steps:
the method comprises the following steps: under the action of suction force of a first induced draft fan, smoke of a smoke channel at the soot side is led out from smoke of a steel rolling heating furnace, the smoke of the smoke channel at the soot side enters a primary heat exchanger at the soot side along a flue to perform heat exchange and temperature rise, and the smoke of the smoke channel at the soot side enters a secondary heat exchanger at the soot side along the flue after the heat exchange and temperature rise;
step two: the hot blast stove burns clean flue gas to generate high-temperature flue gas, secondary heat exchange heating is carried out on the flue gas of the flue gas channel at the soot side in the secondary heat exchanger at the soot side along a pipeline, so that the flue gas of the flue gas channel at the soot side is heated to the temperature required by denitration of the first denitration device, and the high-temperature flue gas after heat exchange heating enters the heat supplementing device through the pipeline to heat the heat supplementing device;
step three: mixing the flue gas of the flue gas channel at the side of the high-temperature coal smoke after heating with a first denitrifying agent injection device, entering a first denitrifying device for denitrifying, removing nitrogen oxides contained in the flue gas of the flue gas channel at the side of the coal smoke, re-entering the flue gas of the flue gas channel at the side of the high-temperature coal smoke after denitrifying into a primary heat exchanger at the side of the coal smoke for heat recovery, carrying out heat exchange and heating on the flue gas of the flue gas channel at the side of the coal smoke which is not denitrated and newly enters the primary heat exchanger at the side of the coal smoke, entering the flue gas of a secondary heat exchanger at the side of the coal smoke after heating and non-denitrifying flue gas channel, and entering the flue gas of the flue gas channel at the side of the denitrated coal smoke after heat exchange and cooling into the first desulfurizing device;
step four: the first desulfurization device is used for desulfurizing flue gas of a flue gas channel at the side of a denitration coal smoke, a desulfurizing agent in the first desulfurization device and sulfur dioxide in the flue gas of the flue gas channel at the side of the denitration coal smoke are subjected to physical and chemical reactions to generate dust particles, the sulfur dioxide in the flue gas of the flue gas channel at the side of the denitration coal smoke is absorbed and purified, the flue gas of the flue gas channel at the side of the denitration coal smoke is subjected to desulfurization and denitration, the flue gas of the flue gas channel at the side of the coal smoke containing powder enters a first bag-type dust remover along a flue and is purified to ensure that the flue gas of the flue gas channel at the side of the coal smoke meets the requirement of environmental emission standard, and the purified flue gas of the flue gas channel at the side of the coal smoke enters a first chimney to be discharged under the traction of a first draught fan;
step five: under the action of the suction force of a second induced draft fan, the smoke of the smoke channel at the air smoke side is led out from the smoke of the steel rolling heating furnace, the smoke of the smoke channel at the air smoke side enters the heat exchanger at the air smoke side along the flue to carry out heat exchange and temperature rise, after the heat exchange and temperature rise, the smoke of the smoke channel at the air smoke side enters the heat supplementing device along the flue, and the heat supplementing device carries out secondary heat supplementing and temperature rise on the smoke of the smoke channel at the air smoke side so that the smoke of the smoke channel at the air smoke side is heated to the temperature required by the denitration of the second denitration device;
step six: mixing the heated high-temperature air-smoke-side flue gas with a second denitrifying agent injection device, entering a second denitrifying device for denitrifying, removing nitrogen oxides contained in the air-smoke-side flue gas, re-entering the denitrated high-temperature air-smoke-side flue gas into an air-smoke-side heat exchanger along a flue for heat recovery, carrying out heat exchange and heating on the non-denitrated air-smoke-side flue gas newly entering the air-smoke-side heat exchanger, entering the heated non-denitrated air-smoke-side flue gas into a heat supplementing device, and entering the denitrated air-smoke-side flue gas into the second denitrifying device along the flue after heat exchange and cooling;
step seven: the second denitrification facility carries out the desulfurization to denitration air smoke side flue gas channel flue gas, desulfurizer takes place physics with sulfur dioxide in the denitration air smoke side flue gas channel flue gas among the second denitrification facility, chemical reaction, generate the dust particulate matter, sulfur dioxide is absorbed and is purified in the denitration air smoke side flue gas channel flue gas, carry out SOx/NOx control to air smoke side flue gas channel flue gas, contain powder air smoke side flue gas channel flue gas and get into in the second sack cleaner along the flue, purify the dust particulate matter, make air smoke side flue gas channel flue gas reach environmental protection emission standard requirement, air smoke side flue gas channel flue gas after the purification discharges in getting into the second chimney under the traction of second draught fan.
Compared with the prior art, the invention has the beneficial effects that: the system device solves the problems that the existing steel rolling heating furnace desulfurization and denitrification equipment has unsatisfactory flue gas desulfurization and denitrification effect, cannot meet the environmental protection requirement and has certain danger in the production process, has reasonable structural design, improves the flue gas denitrification and desulfurization effect, meets the emission standard requirement of flue gas, and can heat exchange high-temperature flue gas heat to the flue gas at the coal smoke side through the primary heat exchanger and the secondary heat exchanger (at the coal smoke side) so as to heat the flue gas at the coal smoke side to reach the temperature required by denitrification, thereby further improving the safety of a denitrification and desulfurization process route and ensuring the personal safety of workers.
Drawings
FIG. 1 is a diagram of a system according to the present invention;
in the figure: 1. a soot side flue gas channel; 2. a smoke channel at the air smoke side; 3. a first-stage heat exchanger at the coal smoke side; 4. a secondary heat exchanger at the coal smoke side; 5. a hot blast stove; 6. a first denitration agent injection device; 7. a first denitrification facility; 8. a first desulfurization unit; 9. a first bag-type dust collector; 10. a first induced draft fan; 11. a first chimney; 12. an air-smoke side heat exchanger; 13. a heat-supplementing device; 14. a second denitration agent injection device; 15. a second denitrification facility; 16. a second desulfurization unit; 17. a second bag-type dust collector; 18. a second induced draft fan; 19. and a second chimney.
Detailed Description
In the description of the present invention, it is to be understood that the terms "longitudinal," "lateral," "upper," "lower," "top," "bottom," "inner," "outer," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the present invention and simplicity in description, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed in a particular orientation, and be operated in a particular manner, and thus are not to be construed as limiting the present invention.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.
In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Specific implementations of the present invention are described in detail below with reference to specific embodiments.
The invention relates to a steel rolling heating furnace post-treatment system, which comprises a soot side flue gas channel 1, an air flue gas channel 2 and a (real-time) online monitoring control system device, wherein the soot side flue gas channel and the air flue gas channel are respectively led out from a flue gas outlet of a steel rolling heating furnace. The system device solves the problems that the existing steel rolling heating furnace desulfurization and denitrification equipment has unsatisfactory flue gas desulfurization and denitrification effect, cannot meet the environmental protection requirement and has certain danger in the production process, has reasonable structural design, improves the flue gas denitrification and desulfurization effect, meets the emission standard requirement of the flue gas, and ensures the temperature of the flue gas on the coal smoke side to reach the temperature required by denitrification by heat exchange of the high-temperature flue gas heat to the flue gas on the coal smoke side through the primary and secondary heat exchangers 3 and 4 on the coal smoke side, thereby further improving the safety of a denitration and desulfurization process route and ensuring the personal safety of workers.
Specifically, referring to fig. 1, in the embodiment of the present invention, a steel rolling heating furnace post-treatment system includes a soot side flue gas channel 1, an empty flue gas channel 2 and a real-time online monitoring and control system device, which are respectively led out from a flue gas outlet of a steel rolling heating furnace, wherein (flue gas of) the soot side flue gas channel 1 and the empty flue gas channel 2 flows along a flue, and (flue gas of) the soot side flue gas channel 1 is sequentially connected with a soot side primary heat exchanger 3, a soot side secondary heat exchanger 4, a first denitration device 7, a first desulfurization device 8, a first bag-type dust collector 9, a first induced draft fan 10 and a first chimney 11 from a flue gas inlet direction to a flue gas outlet direction;
the (flue gas of) the flue gas channel 2 at the air smoke side is sequentially connected with a heat exchanger 12 at the air smoke side, a heat supplementing device 13, a second denitration device 15, a second desulphurization device 16, a second bag-type dust collector 17, a second induced draft fan 18 and a second chimney 19 from the flue gas inlet direction to the flue gas outlet direction;
wherein the cold flue gas outlet end of the coal smoke side primary heat exchanger 3 is connected with the flue gas inlet end of the coal smoke side secondary heat exchanger 4 through a flue, the heat exchange inlet end of the coal smoke side secondary heat exchanger 4 is connected with a hot blast stove 5 through a pipeline, the hot blast stove 5 passes through the coal smoke side secondary heat exchanger 4 and is connected with a heat supplementing device 13 through a pipeline, the flue gas outlet end of the coal smoke side secondary heat exchanger 4 is connected with the flue gas inlet end of a first denitration device 7 through a flue, the flue is connected with a first denitration agent injection device 6 through a leading-out pipeline, the outlet end of the first denitration agent injection device 6 is connected with the flue gas inlet end of the first denitration device 7 through a pipeline, the flue gas outlet end of the first denitration device 7 is connected with the hot flue gas inlet end of the coal smoke side primary heat exchanger 3 through a flue, and the flue gas channel 1 at the coal smoke side primary heat exchanger 3, the hot flue gas outlet end of the coal smoke side primary heat exchanger 3 is connected with the flue gas inlet end of a first desulfurization device 8 through a flue, the flue gas outlet end of the first desulfurization device 8 is connected with the flue gas inlet end of a first bag-type dust collector 9 through a flue, the flue gas outlet end of the first bag-type dust collector 9 is connected with the flue gas inlet end of a first induced draft fan 10 through a flue, and the flue gas outlet end of the first induced draft fan 10 is connected with a first chimney 11 through a flue;
12 flue gas outlet ends of air smoke side heat exchanger are connected with 13 flue gas entrance ends of concurrent heating device through the flue, concurrent heating device 13 is connected with 15 flue gas entrance ends of second denitrification facility through the flue, and the flue has second denitrifier injection apparatus 14 through the pipe connection of drawing forth, 14 exit ends of second denitrifier injection apparatus are connected with 15 flue gas entrance ends of second denitrification facility through the pipeline, 15 flue gas outlet ends of second denitrification facility are connected with 16 flue gas entrance ends of second desulfurization facility through the flue, 16 flue gas outlet ends of second desulfurization facility are connected with 17 flue gas entrance ends of second sack cleaner through the flue, 17 flue gas outlet ends of second sack cleaner are connected with 18 flue gas entrance ends of second draught fan through the flue, 18 flue gas outlet ends of second draught fan are connected with 19 second chimneys through the flue.
The coal smoke side primary heat exchanger 3 is vertically placed (installed), a rotary heat storage device is arranged in the coal smoke side primary heat exchanger 3, the rotary heat storage device is connected with a driving device through a bearing, a cold smoke inlet end and a hot smoke outlet end of the coal smoke side primary heat exchanger 3 are arranged below the coal smoke side primary heat exchanger 3 and are symmetrically distributed, a cold smoke outlet end and a hot smoke inlet end of the coal smoke side primary heat exchanger 3 are arranged above the coal smoke side primary heat exchanger 3 and are symmetrically distributed, the driving device drives a rotor to rotate the heat storage device through the bearing, so that cold coal smoke side smoke and hot smoke side smoke which respectively pass through carry out heat exchange, heat recycling is realized, and the operation cost of enterprises is reduced, the economic benefit of enterprises is improved.
The coal smoke side secondary heat exchanger 4 and the air smoke side heat exchanger 12 are designed in the same way, the coal smoke side secondary heat exchanger 4 and the air smoke side heat exchanger 12 respectively comprise a plate bundle core group, a box body, a smoke inlet and outlet connecting pipeline, a heat exchange pipeline and the like, the plate bundle core group is formed by fixedly connecting polar plates through welding, the box body with sealing and supporting functions is arranged on the outer side of the plate bundle core group, a smoke inlet, a smoke outlet connecting pipeline and a heat exchange pipeline are arranged in the plate bundle core group, the smoke inlet connecting pipeline is connected with a cold smoke outlet end of the coal smoke side primary heat exchanger 3, the smoke outlet connecting pipeline is connected with a smoke inlet end of a first denitration device 7, the heat exchange pipeline is connected with a hot blast stove 5, the coal smoke side secondary heat exchanger 4 takes the plate bundle core group as a heat transfer unit, takes a plate as a heat transfer element, and realizes that high-temperature smoke heat generated by burning clean smoke of the hot blast stove 5 is transferred to the coal smoke side smoke channel 1, so that the temperature of the flue gas channel 1 at the coal smoke side is raised to reach the temperature required by denitration.
First denitration agent injection apparatus 6 is the same with 14 internal designs of second denitration agent injection apparatus, first denitration agent injection apparatus 6 and second denitration agent injection apparatus 14 all include that the denitration agent stores and conveyor, the denitration agent is stored and conveyor has denitration agent evaporation plant through the pipe connection, denitration agent evaporation plant is connected with first denitration device 7 and second denitration device 15 respectively through the flue, and is equipped with static mixing arrangement and flue gas guiding device along the exhanst gas outlet direction in the flue, through setting up static mixing arrangement and flue gas guiding device, ensures that coal smoke side flue gas passageway 1 and empty smoke side flue gas passageway 2 respectively with the denitration agent misce bene, is convenient for improve the denitration efficiency of coal smoke side flue gas passageway 1 and empty smoke side flue gas passageway 2.
The denitration agent is the aqueous ammonia to the aqueous ammonia evaporates in the high temperature coal smoke side flue gas passageway 1 of being convenient for and the flue gas of empty cigarette side flue gas passageway 2 (the aqueous ammonia evaporates to become the ammonia, has improved the flue gas with coal smoke side flue gas passageway 1 and empty cigarette side flue gas passageway 2 (the flue gas), be equipped with the aqueous ammonia in the denitration agent evaporation plant and reveal detection device, set up the aqueous ammonia and reveal detection device and be convenient for reveal the aqueous ammonia and carry out real-time detection, guarantee the stability and the security of entire system operation.
The first denitration device 7 and the second denitration device 15 are designed in the same way, the first denitration device 7 and the second denitration device 15 both comprise denitration reactors, an airflow uniform distribution device is arranged at the upper flue gas inlet in the denitration reactor to ensure the uniformity of flue gas flowing before the coal-smoke-side flue gas channel 1 and the air-smoke-side flue gas channel 2 enter the denitration reactor, a plurality of layers of supporting beams are arranged below the airflow uniform distribution device, catalysts are placed on the surfaces of the supporting beams, the supporting beams play a role in fixing and supporting the catalysts, and the catalysts are arranged, so that the activation energy of the coal-smoke-side flue gas channel 1 and the air-smoke-side flue gas channel 2 in reaction is reduced, the chemical reaction rate is improved, the denitration efficiency of (flue gas of) the coal-smoke-side flue gas channel 1 and the air-smoke-side flue gas channel 2 is improved, and a plurality of manhole doors corresponding to the catalysts are uniformly arranged on the surfaces of the denitration reactors, be convenient for carry out the dismouting to the catalyst, guaranteed that denitration reactor carries out the leakproofness when the flue gas of soot side flue gas passageway 1 and empty smoke side flue gas passageway 2 denitration reaction, avoided external dust to fall into the catalyst and reduced soot side flue gas passageway 1 and empty smoke side flue gas passageway 2 denitration effect, denitration reactor outside is equipped with the maintenance platform that is used for fixing, support and daily maintenance, the maintenance platform is through welded fastening connection with stair, the staff's of being convenient for daily work and maintenance.
The device comprises a denitration reactor, a catalyst and a dust storage device, wherein the denitration reactor is arranged in the denitration reactor, the catalyst is arranged in the denitration reactor, the dust storage device is arranged below the catalyst and is connected with the inner wall of the denitration reactor, and the dust storage device is arranged below the catalyst and is positioned at the bottom of the denitration reactor, so that dust after dust removal can be conveniently collected.
The internal design of the first desulfurization device 8 is the same as that of the second desulfurization device 16, the first desulfurization device 8 and the second desulfurization device 16 both comprise a desulfurizer feeding device, a desulfurizer grinding and conveying device and an injection device, the desulfurizer feeding device is connected with the desulfurizer grinding and conveying device, the desulfurizer grinding and conveying device is connected with the injection device through a pipeline, the injection device is connected with a flue through a pipeline, the first desulfurization device 8 and the second desulfurization device 16 are SDS dry-method desulfurization devices, and a desulfurization tower and accessory equipment thereof do not need to be newly built on the pipeline, so that the disposable investment is small, the occupied area is small, the desulfurization system is very simple, the system resistance is not increased, the operation and maintenance are more convenient, the operation cost is very low, the market competitiveness is very strong, and the desulfurizer sprayed into the pipeline is dry-state substance without wastewater generation.
A post-treatment process of a steel rolling heating furnace comprises the following steps:
the method comprises the following steps: under the action of suction force of a first induced draft fan 10, smoke of a smoke channel 1 at the soot side is led out from smoke of a steel rolling heating furnace, the smoke of the smoke channel 1 at the soot side enters a primary heat exchanger 3 at the soot side along a flue to perform heat exchange and temperature rise, and the smoke of the smoke channel 1 at the soot side enters a secondary heat exchanger 4 at the soot side along the flue after the heat exchange and temperature rise;
step two: the hot blast stove 5 burns clean flue gas to generate high-temperature flue gas, secondary heat exchange heating is carried out on the flue gas of the flue gas channel 1 at the soot side in the secondary heat exchanger 4 at the soot side along a pipeline, so that the flue gas of the flue gas channel 1 at the soot side is heated to the temperature required by the denitration of the first denitration device 7, and the high-temperature flue gas after heat exchange heating enters the heat supplementing device 13 through the pipeline to heat the heat supplementing device 13;
step three: mixing the flue gas of the high-temperature coal smoke side flue gas channel 1 after heating with a first denitration agent injection device 6, entering a first denitration device 7 for denitration, removing nitrogen oxides contained in the flue gas of the coal smoke side flue gas channel 1, re-entering the flue gas of the high-temperature coal smoke side flue gas channel 1 after denitration into a coal smoke side primary heat exchanger 3 along a flue for heat recovery, performing heat exchange and heating on the flue gas of a non-denitration coal smoke side flue gas channel 1 newly entering the coal smoke side primary heat exchanger 3, entering the flue gas of the non-denitration coal smoke side flue gas channel 1 after heating into a coal smoke side secondary heat exchanger 4, and entering the flue gas of the denitration coal smoke side flue gas channel 1 after heat exchange and cooling into a first desulfurization device 8 along the flue;
step four: the first desulfurization device 8 is used for desulfurizing the flue gas of the denitration flue gas side flue gas channel 1, a desulfurizing agent in the first desulfurization device 8 and sulfur dioxide in the flue gas of the denitration flue gas side flue gas channel 1 are subjected to physical and chemical reactions to generate dust particles (namely desulfurization ash), the sulfur dioxide in the flue gas of the denitration flue gas side flue gas channel 1 is absorbed and purified, so that the aim of desulfurizing and denitrating the flue gas of the flue gas side flue gas channel 1 is fulfilled, the flue gas of the flue gas channel 1 containing powder and flue gas of the flue gas side flue gas channel 1 enters a first bag-type dust collector 9 along a flue and is purified of the dust particles, so that the flue gas of the flue gas side flue gas channel 1 meets the requirement of an environment-friendly emission standard, and the purified flue gas of the flue gas side flue gas channel 1 enters a first chimney 11 to be discharged under the traction of a first induced draft fan 10;
step five: under the action of the suction force of a second induced draft fan 18, the flue gas of the air-smoke-side flue gas channel 2 is led out from the flue gas of the steel rolling heating furnace, the flue gas of the air-smoke-side flue gas channel 2 enters the air-smoke-side heat exchanger 12 along a flue to perform heat exchange and temperature rise, after the heat exchange and temperature rise, the flue gas of the air-smoke-side flue gas channel 2 enters the heat supplementing device 13 along the flue, and the heat supplementing device 13 performs secondary heat supplementing and temperature rise on the flue gas of the air-smoke-side flue gas channel 2, so that the flue gas of the air-smoke-side flue gas channel 2 is heated to the temperature required by the denitration of the second denitration device 15;
step six: mixing the heated flue gas of the high-temperature air-smoke-side flue gas channel 2 with a second denitrifying agent injection device 14, entering a second denitrifying device 15 for denitrifying, removing nitrogen oxides contained in the flue gas of the air-smoke-side flue gas channel 2, re-entering the flue gas of the denitrated high-temperature air-smoke-side flue gas channel 2 into an air-smoke-side heat exchanger 12 along a flue for heat recovery, performing heat exchange and heating on the flue gas of the non-denitrated air-smoke-side flue gas channel 2 newly entering the air-smoke-side heat exchanger 12, entering the heated flue gas of the non-denitrated air-smoke-side flue gas channel 2 into a heat supplementing device 13, and entering the flue gas of the denitrated air-smoke-side flue gas channel 2 subjected to heat exchange and cooling into the second denitrifying device 15 along the flue;
step seven: the second denitrification facility 15 carries out the desulfurization to 2 flue gases of denitration empty cigarette side flue gas passageway, desulfurizer takes place physics with sulfur dioxide in 2 flue gases of denitration empty cigarette side flue gas passageway in the second denitrification facility 15, chemical reaction, generate the dust particulate matter promptly desulfurization ash, sulfur dioxide is absorbed and is purified in 2 flue gases of denitration empty cigarette side flue gas passageway, thereby realize carrying out the purpose of SOx/NOx control to 2 flue gases of air cigarette side flue gas passageway, 2 flue gases of powder-containing empty cigarette side flue gas passageway get into second sack cleaner 17 along the flue, purify the dust particulate matter, make 2 flue gases of empty cigarette side flue gas passageway reach environmental protection emission standard requirement, 2 flue gases of air cigarette side flue gas passageway after the purification get into second chimney 19 and discharge under the traction of second draught fan 18.
In the embodiment of the invention, in the whole process of the desulfurization and denitrification system, the flue gas of the flue gas channel 1 at the soot side and the flue gas of the flue gas channel 2 at the air side are monitored online in real time by the (real-time) online monitoring and controlling system, so that the control commands are sent to the desulfurizer jetting devices in the first desulfurization device 8 and the second desulfurization device 16, and the denitrifier conveying devices in the first denitrifier jetting device 6 and the second denitrifier jetting device 14, thereby achieving the purpose of economic operation.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.
Claims (10)
1. A steel rolling heating furnace post-treatment system comprises a soot side flue gas channel (1) and an air smoke side flue gas channel (2) which are respectively led out from a flue gas outlet of a steel rolling heating furnace, and is characterized in that the soot side flue gas channel (1) and the air smoke side flue gas channel (2) are arranged along the flow direction of a flue, and a soot side primary heat exchanger (3), a soot side secondary heat exchanger (4), a first denitration device (7), a first desulfurization device (8), a first bag-type dust collector (9), a first induced draft fan (10) and a first chimney (11) are sequentially connected to the side of the soot side flue gas channel (1) from the flue gas inlet direction to the flue gas outlet direction;
the side of the air-smoke-side flue gas channel (2) is sequentially connected with an air-smoke-side heat exchanger (12), a heat supplementing device (13), a second denitration device (15), a second desulphurization device (16), a second bag-type dust collector (17), a second induced draft fan (18) and a second chimney (19) from the flue gas inlet direction to the flue gas outlet direction;
the flue gas outlet end of the coal smoke side first-stage heat exchanger (3) is connected with the flue gas inlet end of the coal smoke side second-stage heat exchanger (4) through a flue, the heat exchange inlet end of the coal smoke side second-stage heat exchanger (4) is connected with a hot blast stove (5) through a pipeline, the hot blast stove (5) penetrates through the coal smoke side second-stage heat exchanger (4) and is connected with a heat supplementing device (13) through a pipeline, the flue gas outlet end of the coal smoke side second-stage heat exchanger (4) is connected with the flue gas inlet end of a first denitration device (7) through a flue, the flue is connected with a first denitration agent injection device (6) through a lead-out pipeline, the outlet end of the first denitration agent injection device (6) is connected with the flue gas inlet end of the first denitration device (7) through a pipeline, and the flue gas outlet end of the first denitration device (7) is connected with the hot flue gas inlet end of the coal smoke side first-stage heat exchanger (3) through a flue, the coal smoke side flue gas channel (1) penetrates through the coal smoke side primary heat exchanger (3), the hot flue gas outlet end of the coal smoke side primary heat exchanger (3) is connected with the flue gas inlet end of a first desulfurization device (8) through a flue, the flue gas outlet end of the first desulfurization device (8) is connected with the flue gas inlet end of a first bag-type dust collector (9) through a flue, the flue gas outlet end of the first bag-type dust collector (9) is connected with the flue gas inlet end of a first induced draft fan (10) through a flue, and the flue gas outlet end of the first induced draft fan (10) is connected with a first chimney (11) through a flue;
the smoke outlet end of the air-smoke side heat exchanger (12) is connected with the smoke inlet end of the heat supplementing device (13) through a smoke channel, the heat supplementing device (13) is connected with the smoke inlet end of the second denitration device (15) through a smoke channel, and the flue is connected with a second denitrifier injection device (14) through a pipeline led out, the outlet end of the second denitrifier injection device (14) is connected with the flue gas inlet end of a second denitrifier (15) through a pipeline, the flue gas outlet end of the second denitration device (15) is connected with the flue gas inlet end of a second desulfurization system (16) through a flue, the flue gas outlet end of the second desulfurization device (16) is connected with the flue gas inlet end of a second bag-type dust collector device (17) through a flue, the smoke outlet end of the second bag-type dust collector (17) is connected with the smoke inlet end of a second induced draft fan (18) through a flue, and the smoke outlet end of the second induced draft fan (18) is connected with a second chimney (19) through a flue.
2. The steel rolling heating furnace aftertreatment system according to claim 1, wherein the heat exchange unit of the coal smoke side primary heat exchanger (3) is vertically arranged, a rotary heat storage device is arranged in the coal smoke side primary heat exchanger (3), the rotary heat storage device is connected with a driving device through a bearing, the cold smoke inlet end and the hot smoke outlet end of the coal smoke side primary heat exchanger (3) are arranged below the coal smoke side primary heat exchanger (3), the cold smoke inlet end and the hot smoke outlet end are symmetrically distributed, the cold smoke outlet end and the hot smoke inlet end of the coal smoke side primary heat exchanger (3) are arranged above the coal smoke side primary heat exchanger (3), and the cold smoke outlet end and the hot smoke inlet end are symmetrically distributed.
3. The steel rolling heating furnace post-treatment system according to claim 1, the internal design of the coal smoke side secondary heat exchanger (4) and the air smoke side heat exchanger (12) is the same, the coal smoke side secondary heat exchanger (4) and the air smoke side heat exchanger (12) both comprise a plate bundle core group, a box body, a smoke inlet and outlet connecting pipeline and a heat exchange pipeline, the plate bundle core group is formed by fixedly connecting polar plates through welding, a box body with sealing and supporting functions is arranged on the outer side of the plate bundle core group, a smoke inlet, a smoke outlet connecting pipeline and a heat exchange pipeline are arranged in the plate bundle core group, the smoke inlet connecting pipeline is connected with the cold smoke outlet end of the first-level heat exchanger (3) at the soot side, the flue gas outlet connecting pipeline is connected with a flue gas inlet end of the first denitration device (7), and the heat exchange pipeline is connected with the hot blast stove (5).
4. The steel rolling heating furnace aftertreatment system according to claim 1, wherein the first denitration agent injection device (6) and the second denitration agent injection device (14) are identical in internal design, the first denitration agent injection device (6) and the second denitration agent injection device (14) comprise denitration agent storage and conveying devices, the denitration agent storage and conveying devices are connected with denitration agent evaporation devices through pipelines, the denitration agent evaporation devices are respectively connected with the first denitration device (7) and the second denitration device (15) through flues, and static mixing devices and flue gas diversion devices are arranged in the flues along the flue gas outlet direction.
5. The steel rolling heating furnace aftertreatment system according to claim 4, wherein the denitration agent is ammonia water, and an ammonia water leakage detection device is arranged in the denitration agent evaporation device.
6. The steel rolling heating furnace aftertreatment system according to claim 1, wherein the first denitration device (7) and the second denitration device (15) are identical in internal design, the first denitration device (7) and the second denitration device (15) both comprise denitration reactors, an airflow uniform distribution device is arranged at a flue gas inlet above the inside of each denitration reactor, a plurality of layers of support beams are arranged below the airflow uniform distribution devices, catalysts are placed on the surfaces of the support beams, a plurality of manhole doors corresponding to the catalysts are uniformly arranged on the surfaces of the denitration reactors, an overhaul platform is arranged outside each denitration reactor, and the overhaul platform is fixedly connected with a stair through welding.
7. The steel rolling heating furnace post-treatment system according to claim 6, wherein a dust removing device connected with the inner wall of the denitration reactor is arranged above the catalyst, and a dust storage device is arranged below the catalyst and at the bottom of the denitration reactor.
8. The steel rolling heating furnace post-treatment system according to claim 1, wherein the first desulfurization device (8) and the second desulfurization device (16) are designed identically, and each of the first desulfurization device (8) and the second desulfurization device (16) comprises a desulfurizer feeding device, a desulfurizer grinding and conveying device and a spraying device, wherein the desulfurizer feeding device is connected with the desulfurizer grinding and conveying device, the desulfurizer grinding and conveying device is connected with the spraying device through a pipeline, and the spraying device is connected with a flue through a pipeline.
9. The steel rolling heating furnace post-treatment system according to any one of claims 1 to 8, further comprising an online monitoring control system arranged at a flue gas flow position.
10. The post-treatment process of the steel rolling heating furnace is characterized by comprising the following steps of:
the method comprises the following steps: under the action of suction force of a first induced draft fan (10), smoke of a smoke channel (1) at the soot side is led out from smoke of a steel rolling heating furnace, the smoke of the smoke channel (1) at the soot side enters a primary heat exchanger (3) at the soot side along a flue to perform heat exchange and temperature rise, and the smoke of the smoke channel (1) at the soot side enters a secondary heat exchanger (4) at the soot side along the flue after heat exchange and temperature rise;
step two: the hot blast stove (5) burns clean smoke to generate high-temperature smoke, secondary heat exchange heating is carried out on the smoke of the smoke channel (1) at the soot side in the secondary heat exchanger (4) at the soot side along a pipeline, so that the smoke of the smoke channel (1) at the soot side is heated to a temperature required by the denitration of the first denitration device (7), and the high-temperature smoke after heat exchange heating enters the heat supplementing device (13) through the pipeline to heat the heat supplementing device (13);
step three: mixing the flue gas of the high-temperature coal smoke side flue gas channel (1) after temperature rise with a first denitration agent injection device (6), entering a first denitration device (7) for denitration, removing nitrogen oxides contained in the flue gas of the coal smoke side flue gas channel (1), enabling the flue gas of the high-temperature coal smoke side flue gas channel (1) after denitration to reenter a coal smoke side primary heat exchanger (3) along a flue for heat recovery, performing heat exchange and temperature rise on the flue gas of a non-denitration coal smoke side flue gas channel (1) newly entering the coal smoke side primary heat exchanger (3), enabling the flue gas of the non-denitration coal smoke side flue gas channel (1) after temperature rise to enter a coal smoke side secondary heat exchanger (4), and enabling the flue gas of the denitration coal smoke side flue gas channel (1) after heat exchange and temperature reduction to enter a first desulfurization device (8) along the flue;
step four: the method comprises the following steps that a first desulfurization device (8) desulfurizes flue gas of a denitration coal smoke side flue gas channel (1), a desulfurizing agent in the first desulfurization device (8) and sulfur dioxide in the flue gas of the denitration coal smoke side flue gas channel (1) are subjected to physical and chemical reactions to generate dust particles, the sulfur dioxide in the flue gas of the denitration coal smoke side flue gas channel (1) is absorbed and purified, the flue gas of the coal smoke side flue gas channel (1) is desulfurized and denitrated, the flue gas containing powder enters a first bag-type dust remover (9) along a flue to purify the dust particles, so that the flue gas of the coal smoke side flue gas channel (1) meets the requirement of an environment-friendly emission standard, and the purified flue gas of the coal smoke side flue gas channel (1) enters a first chimney (11) under the traction of a first draught fan (10) to be emitted;
step five: under the action of the suction force of a second induced draft fan (18), the smoke of the air-smoke-side smoke channel (2) is led out from the smoke of the steel rolling heating furnace, the smoke of the air-smoke-side smoke channel (2) enters the air-smoke-side heat exchanger (12) along a flue to perform heat exchange and temperature rise, after the heat exchange and temperature rise, the smoke of the air-smoke-side smoke channel (2) enters the heat supplementing device (13) along the flue, and the smoke of the heat supplementing device (13) and the smoke of the air-smoke-side smoke channel (2) performs secondary heat supplementing and temperature rise, so that the smoke of the air-smoke-side smoke channel (2) is heated to the temperature required by denitration of the;
step six: mixing the flue gas of the high-temperature air-smoke-side flue gas channel (2) after heating with a second denitrifying agent injection device (14), entering a second denitrifying device (15) for denitrifying, removing nitrogen oxides contained in the flue gas of the air-smoke-side flue gas channel (2), re-entering the flue gas of the high-temperature air-smoke-side flue gas channel (2) after denitrifying into an air-smoke-side heat exchanger (12) along a flue for heat recovery, performing heat exchange and heating on the flue gas of an air-smoke-side flue gas channel (2) which is not denitrated and newly enters the air-smoke-side heat exchanger (12), entering the flue gas of the air-smoke-side flue gas channel (2) which is not denitrated and after heating into a heat supplementing device (13), and entering the flue gas of the denitrated air-smoke-side flue gas channel (2) after heat exchange and cooling into the second denitrifying device (15);
step seven: the second denitrification facility (15) carries out the desulfurization to denitration air smoke side flue gas passageway (2) flue gas, desulfurizer takes place physics with sulfur dioxide in denitration air smoke side flue gas passageway (2) flue gas in second denitrification facility (15), the chemical reaction, generate the dust particulate matter, sulfur dioxide is absorbed and is purified in denitration air smoke side flue gas passageway (2) flue gas, carry out the desulfurization and denitration to air smoke side flue gas passageway (2) flue gas, contain powder air smoke side flue gas passageway (2) flue gas and get into in second sack cleaner (17) along the flue, purify the dust particulate matter, make air smoke side flue gas passageway (2) flue gas reach environmental protection emission standard requirement, air smoke side flue gas passageway (2) flue gas after the purification gets into in second chimney (19) under the traction of second draught fan (18) and discharges.
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