CN110068224B - Flue gas recycling and discharging system of air draft drying section and preheating section of chain grate machine - Google Patents
Flue gas recycling and discharging system of air draft drying section and preheating section of chain grate machine Download PDFInfo
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- CN110068224B CN110068224B CN201910485410.2A CN201910485410A CN110068224B CN 110068224 B CN110068224 B CN 110068224B CN 201910485410 A CN201910485410 A CN 201910485410A CN 110068224 B CN110068224 B CN 110068224B
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- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 title claims abstract description 124
- 239000003546 flue gas Substances 0.000 title claims abstract description 124
- 238000001035 drying Methods 0.000 title claims abstract description 57
- 238000007599 discharging Methods 0.000 title claims abstract description 31
- 238000004064 recycling Methods 0.000 title claims abstract description 14
- 238000001816 cooling Methods 0.000 claims abstract description 37
- 208000028659 discharge Diseases 0.000 claims abstract description 10
- 230000001172 regenerating effect Effects 0.000 claims description 65
- 239000000428 dust Substances 0.000 claims description 38
- 230000001105 regulatory effect Effects 0.000 claims description 15
- 239000000779 smoke Substances 0.000 claims description 8
- 239000008188 pellet Substances 0.000 abstract description 18
- 238000004519 manufacturing process Methods 0.000 abstract description 15
- 238000004134 energy conservation Methods 0.000 abstract description 3
- 238000007605 air drying Methods 0.000 abstract 1
- 239000003570 air Substances 0.000 description 98
- 238000000034 method Methods 0.000 description 11
- 239000002912 waste gas Substances 0.000 description 7
- 239000000463 material Substances 0.000 description 5
- 238000011084 recovery Methods 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 230000001276 controlling effect Effects 0.000 description 2
- 239000002826 coolant Substances 0.000 description 2
- 238000009826 distribution Methods 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 239000000446 fuel Substances 0.000 description 2
- 239000002918 waste heat Substances 0.000 description 2
- 239000012080 ambient air Substances 0.000 description 1
- 230000018044 dehydration Effects 0.000 description 1
- 238000006297 dehydration reaction Methods 0.000 description 1
- 238000006477 desulfuration reaction Methods 0.000 description 1
- 230000023556 desulfurization Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000009851 ferrous metallurgy Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
- F27B21/00—Open or uncovered sintering apparatus; Other heat-treatment apparatus of like construction
- F27B21/02—Sintering grates or tables
-
- 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
- F27D15/00—Handling or treating discharged material; Supports or receiving chambers therefor
- F27D15/02—Cooling
-
- 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
- F27D17/008—Arrangements for using waste heat; Arrangements for using, or disposing of, waste gases cleaning gases
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27M—INDEXING SCHEME RELATING TO ASPECTS OF THE CHARGES OR FURNACES, KILNS, OVENS OR RETORTS
- F27M2001/00—Composition, conformation or state of the charge
- F27M2001/02—Charges containing ferrous elements
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27M—INDEXING SCHEME RELATING TO ASPECTS OF THE CHARGES OR FURNACES, KILNS, OVENS OR RETORTS
- F27M2001/00—Composition, conformation or state of the charge
- F27M2001/18—Composition, conformation or state of the charge in the form of pellets
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Furnace Details (AREA)
- Drying Of Solid Materials (AREA)
Abstract
The invention relates to a flue gas recycling and discharging system for an exhaust drying section and a preheating section of a chain grate, which comprises a chain grate, an upper cover of the chain grate, an air box, a circular cooler, an upper cover of the circular cooler, a hot air return system of the chain grate, a hot air return system of the circular cooler and a flue gas discharge treatment system; the upper cover of the chain grate machine is divided into a forced air drying section, an induced draft drying section, a preheating section and a preheating section, and is characterized in that: the grate machine bellows are divided into three groups, the bellows I corresponds to the forced draught drying section, the bellows II corresponds to the forced draught drying section, and the bellows III of the first half of the preheating section corresponds to the second half of the preheating section and the preheating section; the air box II and the air box III are respectively connected with a grate machine hot air return system, a circular cooler hot air return system and a flue gas discharge system through flue gas branch pipes; the invention has the advantages that: the temperature of hot air returned by the chain grate machine is adjustable, a part of flue gas in the preheating section is recycled as cooling air, the amount of discharged flue gas is reduced, and conditions are created for accurate control, energy conservation and emission reduction in the pellet production process.
Description
Technical Field
The invention belongs to the technical field of pellet production in the ferrous metallurgy industry, and particularly relates to a flue gas recycling and discharging system of an exhaust drying section and a preheating section of a chain grate machine.
Background
At present, the chain grate machine-rotary kiln-circular cooler process is one of the main production processes of iron ore pellet production, and the common hot air flow is to divide the chain grate machine into three chambers (three groups) and four sections, and divide the upper cover of the chain grate machine into four sections of an air blast drying section, an air draft drying section, a preheating section and a preheating section according to the temperature of hot air flow and the mode of passing through a material layer; according to the trend of hot air flow, dividing the air boxes of the grate machine corresponding to four sections of the upper cover of the grate machine into three groups: the first group of bellows corresponds to the blast drying section and receives cooling waste gas from the upper cover of the three cooling sections of the annular cooler and is used as a medium for blast drying; the second group of bellows corresponds to the exhaust drying section and the preheating section, and after the exhaust drying section and the flue gas of the preheating section are collected, all the flue gas is treated by an external exhaust system and then exhausted into the atmosphere; the third group of bellows corresponds to the preheating second section, and after the hot flue gas of the preheating second section is collected, the flue gas is processed by a backheating air system and then returns to the upper cover of the exhausting drying section to be used as a medium for exhausting drying.
The blast drying section is the first procedure for processing green pellets on a chain grate machine, the heat source for blast drying is cooling waste gas from a three-cooling section upper cover of a circular cooler, and hot air flow from bottom to top passes through a green pellet layer to primarily remove moisture of the green pellets.
The air draft drying section is a second procedure for processing green pellets on the chain grate machine, the heat source for air draft drying is hot flue gas (hereinafter referred to as 'hot air return') from a regenerative fan of the chain grate machine, hot air from top to bottom passes through a green pellet material layer to remove green pellet moisture, and the air flow temperature as the air draft drying heat source is determined according to pellet tests.
The preheating section is a transition link on the chain grate machine, the preheating section heat source is hot waste gas from the upper cover of the secondary cooling section of the annular cooler (hereinafter referred to as secondary cooling section waste gas), hot air flow from top to bottom passes through the green ball material layer, residual moisture of the green balls is completely removed, and the dry balls are heated to heat the green balls as required.
The second preheating stage is the last process of treating green balls on a grate machine, hot flue gas from the rotary kiln passes through the material layer from top to bottom, and the dry balls are preheated for a certain time at a proper temperature, so that the strength of the dry balls meets the requirement of kiln entering, and the flue gas passing through the material layer is used as 'hot return air' and is sent to an upper cover of an induced draft drying stage by a heat return fan to be used as a heat source.
In the actual production process, under the influence of various factors such as raw material conditions, production operation and the like, the temperature of the flue gas from the preheating two-section bellows is higher or lower, and a certain difference exists between the flue gas and the temperature required by the air draft drying. When the temperature of the flue gas in the second preheating stage is higher, in order to meet the requirement of exhausting and drying, a certain amount of ambient air is generally added to cool, and the burden of a hot air return system is increased when the air is added; when the temperature of the flue gas of the preheating second section is lower, the requirement of exhausting and drying cannot be met, the expected green ball dehydration effect cannot be achieved, the preheating process on the chain grate machine is influenced, the process on the chain grate machine is moved backwards, the yield is influenced, the index of the preheated balls is lower when the process is serious, the dust amount is increased, the rotary kiln is looped and other consequences are caused, and the production stability and the pellet quality are influenced.
In addition, according to the hot air flow, the temperature is higher after the flue gas of the air draft drying section and the flue gas of the preheating section are mixed, and the flue gas is directly discharged into the atmosphere, so that waste is caused; and the flue gas amount is large, and the flue gas can be discharged into the atmosphere only after desulfurization and denitration, so that the flue gas has certain pressure in the aspect of environmental protection. Therefore, the heat of the exhaust drying section and the preheating section of the flue gas is reasonably recycled, and the environmental protection pressure is very necessary.
Disclosure of Invention
The invention aims to provide a flue gas recycling and discharging system for an exhaust drying section and a preheating section of a chain grate, which is used for realizing accurate control of 'hot air return' temperature, meeting the requirements of the exhaust drying section of the chain grate on wind temperature and wind quantity, fully utilizing flue gas waste heat and reducing the amount of discharged flue gas.
The invention aims at realizing the following technical scheme:
the invention relates to a system for recycling and discharging flue gas in an exhaust drying section and a preheating section of a chain grate, which comprises a chain grate, a chain grate upper cover, a chain grate bellows, a circular cooler upper cover, a circular cooler bellows, a chain grate hot air return system, a circular cooler hot air return system and a flue gas discharge treatment system; the upper cover of the chain grate machine is sequentially divided into a blast drying section, an air draft drying section, a preheating section and a preheating section along the movement direction of the chain grate machine, and the upper cover of the annular cooler is sequentially divided into a cooling section, a secondary cooling section and a tertiary cooling section along the movement direction of the annular cooler, and is characterized in that: the air boxes of the grate machine are divided into three groups, the first group of air boxes I corresponds to an air blast drying section, the second group of air boxes II corresponds to an air draft drying section and a preheating first half section, and the third group of air boxes III corresponds to a preheating second half section and a preheating second section; the second group of air boxes II and the third group of air boxes III are respectively connected with a grate machine hot air return system, a circular cooler hot air return system and a flue gas discharge treatment system through respective flue gas branch pipes;
the system comprises a grate machine regenerative air main pipe, a regenerative air dust remover I, a regenerative air connecting pipeline I and a regenerative fan I, wherein the third group of bellows III is connected with the grate machine regenerative air main pipe through a smoke branch pipe I, an inlet of the regenerative air dust remover I is connected with the grate machine regenerative air main pipe, an outlet of the regenerative air dust remover I is connected with an inlet of the regenerative fan I through the regenerative air connecting pipeline I, and an outlet of the regenerative fan I is connected with an upper cover of an exhaust drying section of the grate machine;
the circular cooler regenerative air system comprises a circular cooler regenerative air main pipe, a regenerative air dust remover II, a regenerative fan II, a regenerative air connecting pipeline II and a cooling fan I, wherein the chain grate machine is correspondingly used for preheating a first section of bellows II and bellows III and correspondingly preheating a second section of bellows III, the circular cooler regenerative air main pipe is connected with the circular cooler regenerative air main pipe through a smoke branch pipe II, an inlet of the regenerative air dust remover II is connected with the circular cooler regenerative air main pipe, an outlet of the regenerative air dust remover II is connected with an inlet of the regenerative fan II, an outlet of the regenerative fan II is connected with an inlet of the cooling fan I through the regenerative air connecting pipeline II, and an outlet of the cooling fan I is connected with a first-cold-section bellows of the circular cooler;
the flue gas outward-discharging treatment system comprises an outward-discharging flue gas main pipe, a main electric dust collector, an outward-discharging flue gas connecting pipeline, a main exhaust fan and a flue gas purifying device, wherein a second group of bellows II corresponding to the exhaust drying section and the preheating section in the first half section is connected with the outward-discharging flue gas main pipe through a flue gas branch pipe III, the outward-discharging flue gas main pipe is connected with an inlet of the main electric dust collector, an outlet of the main electric dust collector is connected with an inlet of the main exhaust fan through the outward-discharging flue gas connecting pipeline, an outlet of the main exhaust fan is connected with an inlet of the flue gas purifying device, and flue gas at an outlet of the flue gas purifying device is discharged outward;
a regulating valve I is arranged on a smoke branch pipe I connected with a first section of rear-section preheating bellows III of the chain grate machine and a second section of rear-section preheating bellows III, and a backheating air valve I is arranged on a backheating air connecting pipeline I between an outlet of a backheating air dust remover I and an inlet of a backheating fan I.
The regulating valve I is arranged on a smoke branch pipe II which is connected with a preheating first section of bellows II and bellows III of the grate machine and preheating second section of bellows III at the rear part, and the regulating valve II and the air exchanging valve II are arranged on a backheating air connecting pipeline II between the outlet of a backheating fan II and the inlet of a cooling fan I.
A regulating valve I is arranged on a flue gas branch pipe III connected with a preheating section of a front section of bellows II of the chain grate machine, and a wind exchanging valve II is arranged on an external flue gas connecting pipeline between an outlet of the main electric dust collector and an inlet of the main exhaust fan.
Compared with the prior art, the invention has the advantages that:
(1) According to the flue gas recycling and discharging system of the air draft drying section and the preheating section of the chain grate machine, the flow direction of flue gas and the distribution proportion of high-low temperature flue gas can be changed by adjusting the opening of the adjusting valve I on the flue gas branch pipe, the aim of adjusting the temperature of mixed flue gas is fulfilled, the temperature of 'hot air return' to the upper cover of the air draft drying section can be conveniently controlled according to production requirements, and conditions are created for accurately controlling the pellet production process;
(2) According to the exhaust drying section and the preheating section flue gas recycling and discharging system of the chain grate machine, a part of hot flue gas is used as a cooling medium, so that hot pellets are prevented from being quenched, the temperature of cooling waste gas of a cooling section is also improved, more heat can be provided for the rotary kiln, the fuel consumption of a main burner of the rotary kiln is saved, and conditions are created for energy conservation in the pellet production process;
(3) According to the exhaust drying section and the preheating section flue gas recycling and discharging system of the grate machine, the flue gas for preheating the rear bellows is sent to the upper cover of the grate machine for use through the regenerative fan I, and the flue gas for preheating the front bellows is sent to the annular cooler through the regenerative fan II to serve as cooling air, so that the whole exhaust of the flue gas for preheating the front bellows is avoided, the treatment capacity of the main electric dust collector, the main exhaust fan and the flue gas purifying device can be greatly reduced, and conditions are created for the emission reduction in the pellet production process.
Drawings
FIG. 1 is a process flow diagram of the present invention.
Fig. 2 is a partial enlarged view of a of fig. 1.
Detailed Description
The invention is further described below with reference to the drawings and examples.
As shown in fig. 1 and 2, the system for recycling and discharging flue gas in the air exhausting and drying section and the preheating section of the chain grate comprises a chain grate 1, a chain grate upper cover, a chain grate bellows, a circular cooler 2, a circular cooler upper cover, a circular cooler bellows, a chain grate hot air return system, a circular cooler hot air return system and a flue gas discharge treatment system; the upper cover of the chain grate machine is sequentially divided into a blast drying section 26, an air draft drying section 27, a preheating section 28 and a preheating section 29 along the movement direction of the chain grate machine 1, and the upper cover of the annular cooler is sequentially divided into a cooling section, a secondary cooling section and a tertiary cooling section along the movement direction of the annular cooler 2, and is characterized in that: the grate air boxes are divided into three groups, the first group of air boxes I corresponds to an air blast drying section, the second group of air boxes II 30 corresponds to an air draft drying section 27 and a first half section of a preheating section 28, and the third group of air boxes III 31 corresponds to a second half section of the preheating section 28 and a second preheating section 29; the second group of bellows II 30 and the third group of bellows III 31 are respectively connected with a grate machine hot air return system, a circular cooler hot air return system and a flue gas discharge treatment system through respective flue gas branch pipes;
the system comprises a main grate machine regenerative air pipe 3, a regenerative air dust remover I4, a regenerative air connecting pipeline I5 and a regenerative fan I6, wherein the third group of bellows III 31 is connected with the main grate machine regenerative air pipe 3 through a flue gas branch pipe I17, an inlet of the regenerative air dust remover I4 is connected with the main grate machine regenerative air pipe 3, an outlet of the regenerative air dust remover I4 is connected with an inlet of the regenerative fan I6 through the regenerative air connecting pipeline I5, and an outlet of the regenerative fan I6 is connected with an upper cover of an exhaust drying section of the grate machine; the flue gas branch pipe I17 of the bellows III 31 connected with the rear section 28 of the preheating section and the rear section 29 of the preheating section of the chain grate machine 1 is provided with a regulating valve I20, and a backheating air connecting pipeline I5 between the outlet of the backheating air dust remover I4 and the inlet of the backheating fan I6 is provided with an air exchanging valve I22.
The circular cooler back-heat wind system comprises a circular cooler back-heat wind main pipe 7, a back-heat wind dust remover II 8, a back-heat wind blower II 9, a back-heat wind connecting pipeline II 10 and a cooling fan I11, wherein the chain grate machine 1 is correspondingly preheated to a windbox II 30 and a windbox III 31 of a first section 28 and a windbox III 31 of a second section 29, which are correspondingly preheated, and is connected with the circular cooler back-heat wind main pipe 7 through a flue gas branch pipe II 18, an inlet of the back-heat wind dust remover II 8 is connected with the circular cooler back-heat wind main pipe 7, an outlet of the back-heat wind dust remover II 8 is connected with an inlet of the back-heat wind blower II 9, an outlet of the back-heat wind blower II 9 is connected with an inlet of the cooling fan I11 through a back-heat wind connecting pipeline II 10, and an outlet of the cooling fan I11 is connected with a first cooling wind box 25 of the circular cooler; the regulating valve I20 is arranged on the flue gas branch pipe II 18 which is connected with the bellows II 30 and the bellows III 31 of the preheating first section 28 of the grate machine and the bellows III 31 of the preheating second section 29 rear section, and the regulating valve II 21 and the air exchanging valve II 24 are arranged on the backheating air connecting pipeline II 10 between the outlet of the backheating fan II 9 and the inlet of the cooling fan I11.
The flue gas outward-discharging treatment system comprises an outward-discharging flue gas main pipe 12, a main electric dust collector 13, an outward-discharging flue gas connecting pipeline 14, a main exhaust fan 15 and a flue gas purifying device 16, wherein a second group of bellows II 30 corresponding to the exhaust drying section 27 and the first half section of the preheating section 28 are connected with the outward-discharging flue gas main pipe 12 through a flue gas branch pipe III 19, the outward-discharging flue gas main pipe 12 is connected with an inlet of the main electric dust collector 13, an outlet of the main electric dust collector 13 is connected with an inlet of the main exhaust fan 15 through the outward-discharging flue gas connecting pipeline 14, an outlet of the main exhaust fan 15 is connected with an inlet of the flue gas purifying device 16, and flue gas at an outlet of the flue gas purifying device 16 is discharged outward; a regulating valve I20 is arranged on a flue gas branch pipe III 19 of a bellows II 30 connected with a preheating section 28 of the chain grate machine, and a wind exchanging valve II 23 is arranged on an external flue gas connecting pipeline 14 between the outlet of the main electric dust collector 13 and the inlet of the main exhaust fan 15.
Working process
The working process of the invention is as follows:
(1) Heat return air system of chain grate machine
Part of flue gas of the second half section of the preheating section 28 of the chain grate machine 1 and flue gas of most of the bellows III 31 of the preheating section 29 enter the heat recovery air main pipe 3 of the chain grate machine through the flue gas branch pipe I17 to be converged, and the flue gas is sent to the upper cover of the air draft drying section 27 of the chain grate machine 1 through the heat recovery air dust remover I4 and the heat recovery fan I6 to be used as a heating medium.
(2) Flue gas discharge treatment system
The flue gas of the bellows II 30 of the air draft drying section 27 of the chain grate machine 1 and part of the flue gas of the bellows II 30 of the first half section of the preheating section 28 enter the outer flue gas main pipe 12 through the flue gas branch pipe III 19 to be converged, and the flue gas is discharged as waste gas through the main electric dust collector 13, the main air draft fan 15 and the flue gas purifying device 16.
(3) Regenerative air system of annular cooler
The rest of the flue gas of the first preheating section 28 and the second preheating section 29 of the grate machine 1 is mixed through a flue gas branch pipe II 18 of a wind box II 30 and a wind box III 31, and is sent to a wind box 25 of a first cooling section of the annular cooler 2 to be used as cooling wind through a regenerative wind dust remover II 8, a regenerative wind machine II 9 and a cooling wind machine I11.
According to the hot air return system of the chain grate machine, the hot air return system of the circular cooler and the flue gas discharge treatment system, according to production requirements, the trend of the flue gas of the first section 28 and the second section 29 of the preheating bellows of the chain grate machine 1 can be determined by reasonably adjusting the opening of the regulating valve I20 on the flue gas branch pipe I17, the flue gas branch pipe II 18 and the flue gas branch pipe III 19, the flue gas flow direction is switched, the distribution proportion of high-low temperature flue gas is regulated, the purpose of controlling the temperature of mixed flue gas is achieved, and therefore the temperature of flue gas at the outlet of the backheating fan I6 is controlled, the temperature of the backheating air can be regulated according to production requirements, and conditions are created for accurate control of the pellet production process.
According to the invention, a part of hot flue gas of the preheating section of the chain grate machine 1 is used as a cooling medium of the annular cooler 2 for recycling, so that hot pellets entering the annular cooler 2 are prevented from being quenched, the temperature of cooling waste gas of the first cooling section of the annular cooler 2 can be increased, more heat is provided for the rotary kiln, the fuel consumption of the main burner of the rotary kiln is saved, the flue gas waste heat can be fully utilized, the flue gas amount discharged by the system can be reduced, and the method has practical significance for energy conservation and emission reduction in pellet production.
Claims (4)
1. The system comprises a chain grate, an upper cover of the chain grate, a bellows of the chain grate, an annular cooler, an upper cover of the annular cooler, a bellows of the annular cooler, a hot air return system of the chain grate, a hot air return system of the annular cooler and a flue gas discharge treatment system; the upper cover of the chain grate machine is sequentially divided into a blast drying section, an air draft drying section, a preheating section and a preheating section along the movement direction of the chain grate machine, and the upper cover of the annular cooler is sequentially divided into a cooling section, a secondary cooling section and a tertiary cooling section along the movement direction of the annular cooler, and is characterized in that: the air boxes of the grate machine are divided into three groups, the first group of air boxes I corresponds to an air blast drying section, the second group of air boxes II corresponds to an air draft drying section and a preheating first half section, and the third group of air boxes III corresponds to a preheating second half section and a preheating second section; the second group of air boxes II and the third group of air boxes III are respectively connected with a grate machine hot air return system, a circular cooler hot air return system and a flue gas discharge treatment system through respective flue gas branch pipes;
the system comprises a grate machine regenerative air main pipe, a regenerative air dust remover I, a regenerative air connecting pipeline I and a regenerative fan I, wherein the third group of bellows III is connected with the grate machine regenerative air main pipe through a smoke branch pipe I, an inlet of the regenerative air dust remover I is connected with the grate machine regenerative air main pipe, an outlet of the regenerative air dust remover I is connected with an inlet of the regenerative fan I through the regenerative air connecting pipeline I, and an outlet of the regenerative fan I is connected with an upper cover of an exhaust drying section of the grate machine;
the circular cooler regenerative air system comprises a circular cooler regenerative air main pipe, a regenerative air dust remover II, a regenerative fan II, a regenerative air connecting pipeline II and a cooling fan I, wherein the chain grate machine is correspondingly used for preheating a first section of bellows II and bellows III and correspondingly preheating a second section of bellows III, the circular cooler regenerative air main pipe is connected with the circular cooler regenerative air main pipe through a smoke branch pipe II, an inlet of the regenerative air dust remover II is connected with the circular cooler regenerative air main pipe, an outlet of the regenerative air dust remover II is connected with an inlet of the regenerative fan II, an outlet of the regenerative fan II is connected with an inlet of the cooling fan I through the regenerative air connecting pipeline II, and an outlet of the cooling fan I is connected with a first-cold-section bellows of the circular cooler;
the flue gas outward-discharging treatment system comprises an outward-discharging flue gas main pipe, a main electric dust collector, an outward-discharging flue gas connecting pipeline, a main exhaust fan and a flue gas purifying device, wherein a second group of bellows II corresponding to the exhaust drying section and the preheating section of the first half section are connected with the outward-discharging flue gas main pipe through a flue gas branch pipe III, the outward-discharging flue gas main pipe is connected with the inlet of the main electric dust collector, the outlet of the main electric dust collector is connected with the inlet of the main exhaust fan through the outward-discharging flue gas connecting pipeline, the outlet of the main exhaust fan is connected with the inlet of the flue gas purifying device, and the flue gas at the outlet of the flue gas purifying device is discharged outward.
2. The system for recycling and discharging flue gas in the exhaust drying section and the preheating section of a chain grate machine according to claim 1, wherein the system comprises: a regulating valve I is arranged on a smoke branch pipe I connected with a first section of rear-section preheating bellows III of the chain grate machine and a second section of rear-section preheating bellows III, and a backheating air valve I is arranged on a backheating air connecting pipeline I between an outlet of a backheating air dust remover I and an inlet of a backheating fan I.
3. The system for recycling and discharging flue gas in the exhaust drying section and the preheating section of a chain grate machine according to claim 1, wherein the system comprises: the regulating valve I is arranged on a smoke branch pipe II which is connected with a preheating first section of bellows II and bellows III of the grate machine and preheating second section of bellows III at the rear part, and the regulating valve II and the air exchanging valve II are arranged on a backheating air connecting pipeline II between the outlet of a backheating fan II and the inlet of a cooling fan I.
4. The system for recycling and discharging flue gas in the exhaust drying section and the preheating section of a chain grate machine according to claim 1, wherein the system comprises: a regulating valve I is arranged on a flue gas branch pipe III connected with a preheating section of a front section of bellows II of the chain grate machine, and a wind exchanging valve II is arranged on an external flue gas connecting pipeline between an outlet of the main electric dust collector and an inlet of the main exhaust fan.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910485410.2A CN110068224B (en) | 2019-06-05 | 2019-06-05 | Flue gas recycling and discharging system of air draft drying section and preheating section of chain grate machine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910485410.2A CN110068224B (en) | 2019-06-05 | 2019-06-05 | Flue gas recycling and discharging system of air draft drying section and preheating section of chain grate machine |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN110068224A CN110068224A (en) | 2019-07-30 |
| CN110068224B true CN110068224B (en) | 2024-04-02 |
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|---|---|---|---|
| CN201910485410.2A Active CN110068224B (en) | 2019-06-05 | 2019-06-05 | Flue gas recycling and discharging system of air draft drying section and preheating section of chain grate machine |
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| CN113883897B (en) * | 2020-07-01 | 2022-08-16 | 中冶长天国际工程有限责任公司 | Air channeling prevention system for preheating section of chain grate machine and air flow control method thereof |
| CN114061319B (en) * | 2020-08-07 | 2023-06-30 | 中冶长天国际工程有限责任公司 | Grate-rotary kiln pellet smoke circulation treatment system and smoke treatment process thereof |
| CN114061321B (en) * | 2020-08-07 | 2023-06-23 | 中冶长天国际工程有限责任公司 | Pellet flue gas treatment system based on rotary kiln primary circulation air inlet and flue gas treatment process thereof |
| CN114061320B (en) * | 2020-08-07 | 2023-06-23 | 中冶长天国际工程有限责任公司 | Grate-rotary kiln-circular cooler pellet smoke circulation coupling treatment system and smoke treatment process thereof |
| CN113462888A (en) * | 2021-08-04 | 2021-10-01 | 中冶北方（大连）工程技术有限公司 | System and method for improving medium-temperature denitration effect of rotary kiln pellets of chain grate machine |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101575671A (en) * | 2009-06-24 | 2009-11-11 | 中冶长天国际工程有限责任公司 | Pellet ore pre-heating method, preparation method and device therefor |
| CN101624647A (en) * | 2009-08-04 | 2010-01-13 | 武汉钢铁(集团)公司 | Pellet roasting production technology recycling residual heat and system thereof |
| CN102252530A (en) * | 2011-07-15 | 2011-11-23 | 中冶北方工程技术有限公司 | Novel waste heat utilization and emission reduction process for hot air systems of chain grate machine, rotary kiln and circular cooler |
| JP2013002724A (en) * | 2011-06-16 | 2013-01-07 | Jp Steel Plantech Co | Waste heat recovery equipment, waste heat recovery method, and sintering machine system |
| CN108267009A (en) * | 2018-03-27 | 2018-07-10 | 中冶北方（大连）工程技术有限公司 | Grate hot-air system |
| CN210036270U (en) * | 2019-06-05 | 2020-02-07 | 中冶北方（大连）工程技术有限公司 | Flue gas recycling and discharging system for air draft drying section and preheating section of chain grate machine |
-
2019
- 2019-06-05 CN CN201910485410.2A patent/CN110068224B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101575671A (en) * | 2009-06-24 | 2009-11-11 | 中冶长天国际工程有限责任公司 | Pellet ore pre-heating method, preparation method and device therefor |
| CN101624647A (en) * | 2009-08-04 | 2010-01-13 | 武汉钢铁(集团)公司 | Pellet roasting production technology recycling residual heat and system thereof |
| JP2013002724A (en) * | 2011-06-16 | 2013-01-07 | Jp Steel Plantech Co | Waste heat recovery equipment, waste heat recovery method, and sintering machine system |
| CN102252530A (en) * | 2011-07-15 | 2011-11-23 | 中冶北方工程技术有限公司 | Novel waste heat utilization and emission reduction process for hot air systems of chain grate machine, rotary kiln and circular cooler |
| CN108267009A (en) * | 2018-03-27 | 2018-07-10 | 中冶北方（大连）工程技术有限公司 | Grate hot-air system |
| CN210036270U (en) * | 2019-06-05 | 2020-02-07 | 中冶北方（大连）工程技术有限公司 | Flue gas recycling and discharging system for air draft drying section and preheating section of chain grate machine |
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