Coke ore separation and dust removal system for blast furnace ironmaking plant

Abstract

The invention relates to the technical field of metallurgical industry systems, in particular to a coke ore separation and dust removal system for a blast furnace ironmaking plant, which comprises an ore powder dust removal and collection system, a coke powder dust removal and collection system and a dust remover, the coke powder dedusting and collecting system is connected to an air inlet of an ash hopper of the deduster through a pipeline; and an outlet of the deduster is connected with an induced draft system, a mineral powder conveying system and a coke powder conveying system. The mineral powder conveying system and the coke powder conveying system are divided into two sets of independent systems and share one set of dust remover, dust removal box bodies can be reasonably distributed according to the air volume of the two sets of dust removal pipeline systems, optimal configuration of the whole set of dust remover is achieved, and centralized control over the whole set of dust removal system is facilitated; the investment cost and the operation and maintenance cost of dust removal system transformation are further saved; the mineral powder and the coke powder are independently recycled, so that the energy consumption of dust removal equipment during sintering and recycling of the fly ash can be reduced, and the utilization values of the mineral powder and the coke powder can be maximized.

Description

Technical Field

[0001] This invention relates to the field of metallurgical industrial systems technology, and in particular to a coke and ore separation and dust removal system for blast furnace ironmaking plants. Background Technology

[0002] Currently, blast furnace feeding and dust removal systems in blast furnace ironmaking plants are generally divided into blast furnace ore bin dust removal systems and transfer station dust removal systems. The dust collected is a mixture of ore powder and coke powder, and is mainly recycled through sintering. However, the coke powder contained in the dust is too small, so it either directly becomes flue gas after high-temperature combustion or is directly sucked away by the dust removal pipeline, resulting in energy waste and increased energy consumption of the dust removal equipment.

[0003] According to research, coke powder accounts for about 20%-25% of the dust collected in the blast furnace feeding and dust removal system. Under the current trend of energy conservation and cost reduction in steel enterprises, if mineral powder and coke powder can be recovered separately, it can not only reduce the energy consumption of dust removal equipment when the dust is sintered and reused, but also maximize the utilization value of mineral powder and coke powder.

[0004] Therefore, in order to recover ore powder and coke powder separately, there is an urgent need for a coke-ore separation and dust removal system for blast furnace ironmaking plants. Summary of the Invention

[0005] This invention provides a coke and ore separation dust removal system for blast furnace ironmaking plants, which aims to separate and recover coke powder and ore powder from dust removal ash, reduce the energy consumption of dust removal equipment when dust removal ash is sintered and reused, and maximize the utilization value of ore powder and coke powder.

[0006] The present invention provides a coke and ore separation and dust removal system for blast furnace ironmaking plants, which adopts the following technical solution: A coke and ore separation and dust removal system for a blast furnace ironmaking plant includes a ore dust collection system, a coke dust collection system, and a dust collector. The ore dust collection system is connected to the inlet of the main flue of the dust collector, the coke dust collection system is connected to the air inlet of the dust collector's ash hopper, and the dust collector outlet is connected to an induced draft system, an ore powder conveying system, and a coke powder conveying system, respectively.

[0007] By adopting the above technical solution, the ore powder conveying system and the coke powder conveying system are divided into two separate systems that do not affect each other. Since the two dust removal pipeline systems share one dust collector, the dust collector housing can be reasonably allocated according to the air volume of the two dust removal pipeline systems to achieve optimized configuration of the entire dust collector. This is also more conducive to centralized control of the entire dust removal system and saves investment costs and operation and maintenance costs for dust removal system modification. By recovering ore powder and coke powder separately, the energy consumption of dust removal equipment can be reduced when dust ash is sintered and reused, and the utilization value of ore powder and coke powder can be maximized.

[0008] Preferably, the mineral dust collection system includes a main mineral dust collection pipeline and several mineral dust collection points. The several mineral dust collection points are connected to the main mineral dust collection pipeline by mineral dust branch pipelines. The outlet of the main mineral dust collection pipeline is connected to the inlet of the main flue of the dust collector.

[0009] Preferably, the dust removal points for mineral powder include dust removal points in blast furnace ore bins, dust removal points in transfer stations and belt conveyors, and / or dust removal points in material yards.

[0010] Preferably, the coke dust collection system includes a main coke dust collection pipeline and several coke dust collection points. The several coke dust collection points are connected to the main coke dust collection pipeline by coke dust branch pipelines. The outlet of the main coke dust collection pipeline is connected to several coke dust branch pipelines, and the coke dust branch pipelines are connected to the air inlet of the dust collector ash hopper.

[0011] Preferably, the coke dust removal points include coke dust removal points in blast furnace ore bins, coke dust removal points in transfer stations and belt conveyors, and / or coke dust removal points in material yards.

[0012] Preferably, the exhaust system includes a fan motor unit and a chimney, with a fan inlet pipe connecting the fan motor unit to the dust collector and a fan outlet pipe connecting the fan motor unit to the chimney.

[0013] Preferably, the mineral powder conveying system includes a lower silo pump system for the mineral powder hopper and a mineral powder silo, with a pneumatic conveying pipeline connecting the lower silo pump system to the mineral powder silo.

[0014] Preferably, one outlet of the mineral powder ash silo is connected to a mineral powder granular material transport vehicle via a receiving device for the mineral powder ash silo, and the other outlet of the mineral powder ash silo is connected to a sintering batching dust removal ash silo via a lower silo pump system and a mineral powder external delivery pipeline.

[0015] Preferably, the coke powder conveying system includes a coke powder hopper lower silo pump system and a coke powder silo, and a pneumatic conveying pipeline from the coke powder hopper to the silo connects the coke powder hopper lower silo pump system and the coke powder silo.

[0016] Preferably, one outlet of the coke powder ash silo is connected to a coke powder granular material transport vehicle via a coke powder ash silo receiving device, and the other outlet of the coke powder ash silo is connected to a pulverized coal silo in the blast furnace pulverized coal injection workshop via a coke powder ash silo lower silo pump system and a coke powder external delivery pipeline.

[0017] In summary, the present invention has at least one of the following beneficial technical effects: 1. It reduces the energy consumption of dust removal equipment when sintering ash is reused, and lowers the operation and maintenance costs of dust removal equipment; 2. Maximizing the utilization value of mineral powder and coke powder can save money and create higher economic benefits; 3. The pneumatic conveying system, consisting of a silo pump system and conveying pipelines, avoids dust generated during material handling, thus protecting the environment; 4. It enables both mineral powder and coke powder to share a single dust collector, allowing for the retrofitting of existing equipment instead of having to build a new dust collector, thus significantly reducing equipment investment costs; 5. Rational planning of the dust collection pipeline system can optimize the operation of the dust collector, achieving environmental protection effects while effectively reducing the operation and maintenance costs of the dust collection equipment and saving energy and electricity. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure of the coke and ore separation and dust removal system in a blast furnace ironmaking plant according to an embodiment of the present invention.

[0019] Explanation of reference numerals in the attached diagrams: 1. Ore dust collection system; 101. Ore dust collection point in blast furnace ore bin; 102. Ore dust collection point in transfer station and belt conveyor; 103. Ore dust collection point in material yard; 104. Branch pipeline of ore dust collection point in blast furnace ore bin; 105. Branch pipeline of ore dust collection point in transfer station and belt conveyor; 106. Branch pipeline of ore dust collection point in material yard; 107. Main ore dust collection pipeline; 2. Coke dust collection system System; 201. Dust removal points for coke powder in blast furnace ore bins; 202. Dust removal points for coke powder in transfer stations and belt conveyors; 203. Dust removal points for coke powder in the material yard; 204. Branch pipelines for dust removal points for coke powder in blast furnace ore bins; 205. Branch pipelines for dust removal points for coke powder in transfer stations and belt conveyors; 206. Branch pipelines for dust removal points for coke powder in the material yard; 207. Main pipeline for coke powder dust removal; 208. Branch pipelines for coke powder dust removal; 3. Dust collector; 4. Fan motor Group; 401. Fan inlet pipe; 402. Fan outlet pipe; 5. Chimney; 6. Mineral powder conveying system; 601. Mineral powder ash hopper lower silo pump system; 602. Pneumatic conveying pipe from mineral powder ash hopper to ash silo; 603. Mineral powder ash silo; 604. Mineral powder ash silo and powder / granular material transport vehicle connection device; 605. Mineral powder / granular material transport vehicle; 606. Mineral powder ash silo lower silo pump system; 607. Mineral powder external conveying pipe 7. Coke powder conveying system; 608. Sintering batching dust removal ash silo; 7. Coke powder conveying system; 701. Coke powder ash hopper lower silo pump system; 702. Coke powder ash hopper to ash silo pneumatic conveying pipeline; 703. Coke powder ash silo; 704. Coke powder ash silo and powder material transport vehicle connection device; 705. Coke powder powder material transport vehicle; 706. Coke powder ash silo lower silo pump system; 707. Coke powder external conveying pipeline; 708. Blast furnace pulverized coal silo. Detailed Implementation

[0020] The following combination Figure 1 The present invention will be described in further detail below.

[0021] This invention discloses a coke and ore separation and dust removal system for a blast furnace ironmaking plant, which includes an ore dust collection system 1, a coke dust collection system 2, a dust collector 3, a fan motor unit 4, a chimney 5, an ore conveying system 6, and a coke conveying system 7.

[0022] The ore dust collection system 1 includes ore dust collection points 101 in the blast furnace ore bin, ore dust collection points 102 in the transfer station and belt conveyor, ore dust collection points 103 in the material yard, branch pipes 104 for the ore dust collection points in the blast furnace ore bin, branch pipes 105 for the ore dust collection points in the transfer station and belt conveyor, branch pipes 106 for the ore dust collection points in the material yard, and a main ore dust collection pipe 107.

[0023] The branch pipe 104 of the blast furnace ore bin dust removal point is connected between the blast furnace ore bin dust removal point 101 and the main dust removal pipe 107. The branch pipe 105 of the transfer station and belt conveyor dust removal point is connected between the transfer station and belt conveyor dust removal point 102 and the main dust removal pipe 107. The branch pipe 106 of the material yard dust removal point is connected between the material yard dust removal point 103 and the main dust removal pipe 107. The outlet of the main dust removal pipe 107 is connected to the inlet of the main flue of the dust collector 3.

[0024] The coke dust collection system 2 includes a coke dust collection point 201 in the blast furnace ore bin, a coke dust collection point 202 in the transfer station and belt conveyor, a coke dust collection point 203 in the material yard, a branch pipeline 204 for the coke dust collection point in the blast furnace ore bin, a branch pipeline 205 for the coke dust collection point in the transfer station and belt conveyor, a branch pipeline 206 for the coke dust collection point in the material yard, and a main coke dust collection pipeline 207.

[0025] The branch pipe 204 of the coke dust removal point in the blast furnace ore bin is connected between the coke dust removal point 201 in the blast furnace ore bin and the main coke dust removal pipe 207. The branch pipe 205 of the coke dust removal point in the transfer station and belt conveyor is connected between the coke dust removal point 202 in the transfer station and belt conveyor and the main coke dust removal pipe 207. The branch pipe 206 of the coke dust removal point in the material yard is connected between the coke dust removal point 203 in the material yard and the main coke dust removal pipe 207. Several coke dust removal branch pipes 208 are connected to the outlet of the main coke dust removal pipe 207. The coke dust removal branch pipes 208 are connected to the air inlet of the ash hopper of the dust collector 3.

[0026] A fan inlet pipe 401 connects the inlet of the fan motor unit 4 to the dust collector 3, and a fan outlet pipe 402 connects the outlet of the fan motor unit 4 to the chimney 5. The fan motor unit 4, the fan inlet pipe 401, the fan outlet pipe 402 and the chimney 5 form a set of induced draft system, which can be used by both mineral powder and coke powder dust collectors.

[0027] The mineral powder conveying system 6 includes a lower silo pump system 601 for the mineral powder ash hopper, a pneumatic conveying pipeline from the mineral powder ash hopper to the ash silo 602, a mineral powder ash silo 603, a connecting device 604 for the mineral powder ash silo and the powder and granular material transport vehicle, a mineral powder and granular material transport vehicle 605, a lower silo pump system 606 for the mineral powder ash silo 606, a mineral powder external conveying pipeline 607, and a sintering batching dust removal ash silo 608.

[0028] The lower silo pump system 601 of the ore powder hopper is used to collect ore powder filtered by the dust collector 3. The lower silo pump system 601 of the ore powder hopper is connected to the ore powder silo 603 through the pneumatic conveying pipeline 602 from the ore powder hopper to the silo. One outlet of the ore powder silo 603 is connected to the ore powder granular material transport vehicle 605 through the ore powder silo and granular material transport vehicle receiving device 604. The other outlet of the ore powder silo 603 is connected to the sintering batching dust removal silo 608 through the lower silo pump system 606 of the ore powder silo and the ore powder external conveying pipeline 607.

[0029] The coke powder conveying system 7 includes a coke powder ash hopper lower silo pump system 701, a coke powder ash hopper to ash silo pneumatic conveying pipeline 702, a coke powder ash silo 703, a coke powder ash silo and powder material transport vehicle connection device 704, a coke powder powder material transport vehicle 705, a coke powder ash silo lower silo pump system 706, a coke powder external conveying pipeline 707, and a pulverized coal silo in the blast furnace pulverized coal injection workshop 708.

[0030] The coke powder ash hopper lower silo pump system 701 is used to collect coke powder filtered by the dust collector 3. The coke powder ash hopper lower silo pump system 701 is connected to the coke powder ash silo 703 through the coke powder ash hopper to ash silo pneumatic conveying pipeline 702. One outlet of the coke powder ash silo 703 is connected to the coke powder granular material transport vehicle 705 through the coke powder ash silo and granular material transport vehicle receiving device 704. The other outlet of the coke powder ash silo 703 is connected to the pulverized coal silo 708 of the blast furnace pulverized coal injection workshop through the coke powder ash silo lower silo pump system 706 and the coke powder external conveying pipeline 707.

[0031] The implementation principle of the coke and ore separation dust removal system in the blast furnace ironmaking plant of this invention is as follows: The ore dust collection system 1 is used for dust removal at ore dust removal points 101 in the blast furnace ore bin, 102 in the transfer station and belt conveyor, and 103 in the material yard. The branch pipes 104, 105, and 106 of the ore dust removal points in the blast furnace ore bin, the transfer station and belt conveyor, and the material yard are all connected to the main ore dust removal pipe 107. Each branch point is equipped with a control valve, which is opened in a timely manner according to the actual process settings to achieve dynamic control under different process requirements.

[0032] The coke dust collection system 2 is used for dust removal at coke dust collection points such as blast furnace ore bin 201, transfer station and belt conveyor 202, and material yard 203. The branch pipes 204, 205, and 206 of the coke dust collection points at the blast furnace ore bin, transfer station and belt conveyor, and material yard are all connected to the main coke dust collection pipe 207. Each branch point is equipped with a control valve, which is opened in a timely manner according to the actual process settings to achieve dynamic control under different process requirements.

[0033] The mineral powder dust collection system 1 and the coke powder dust collection system 2 are two separate systems that do not affect each other. The main duct 107 of the mineral powder dust collection system 1 has a large air volume and is connected to the main flue inlet of the dust collector 3. The main duct 207 of the coke powder dust collection system 2 has a small air volume and several branch ducts 208 connected to the outlet of the main duct 207 are connected to the ash hopper inlet of the dust collector 3.

[0034] Since the two dust collection systems share one dust collector 3, the dust collector housings can be rationally allocated according to the air volume of the two dust collection systems to achieve optimized configuration of the entire dust collector 3. If the existing dust collection system does not perform coke separation, the existing dust collection system can be directly modified. This modification method without building a new dust collector can greatly reduce investment costs and achieve energy saving and cost reduction. Moreover, this modification method is not limited by the layout of the dust collector housings. By rationally matching the number of housings, the effective allocation of the air volume of the dust collector 3 can be achieved, making it more flexible and applicable.

[0035] In the ore powder conveying system 6, the pneumatic conveying system consisting of the ore powder ash hopper lower silo pump system 601 and the ore powder ash hopper to ash silo pneumatic conveying pipeline 602 can convey the ore powder dust removal ash in the dust collector 3 ash hopper to the ore powder ash silo 603. The ore powder dust removal ash collected in the ore powder ash silo 603 can be connected to the ore powder granular material transport vehicle 605 by the ore powder ash silo and powder granular material transport vehicle connecting device 604. The ore powder dust removal ash can be transported by the ore powder granular material transport vehicle 605 to the sintering batching workshop for sintering reuse or other demand points. The ore powder dust removal ash collected in the ore powder ash silo 603 can also be conveyed to the sintering batching dust removal ash silo 608 or other demand points through the pneumatic conveying system consisting of the ore powder ash silo lower silo pump system 606 and the ore powder external conveying pipeline 607.

[0036] In the coke powder conveying system 7, the pneumatic conveying system, consisting of the coke powder ash hopper lower silo pump system 701 and the coke powder ash hopper to ash silo pneumatic conveying pipeline 702, can convey the coke powder dust collected in the dust collector 3 ash hopper to the coke powder ash silo 703. The coke powder dust collected in the coke powder ash silo 703 can be connected to the coke powder granular material transport vehicle 705 by the coke powder ash silo and granular material transport vehicle receiving device 704. The coke powder dust can be transported by the coke powder granular material transport vehicle 705 to the blast furnace pulverized coal injection workshop for blast furnace pulverized coal injection or other demand points. The coke powder dust collected in the coke powder ash silo 703 can also be conveyed to the pulverized coal silo 708 of the blast furnace pulverized coal injection workshop or other demand points through the pneumatic conveying system consisting of the coke powder ash silo lower silo pump system 706 and the coke powder external conveying pipeline 707.

[0037] The ore powder conveying system 6 and the coke powder conveying system 7 are two separate systems that do not affect each other.

[0038] Whether using the mineral powder granular material transport vehicle 605 or the coke powder granular material transport vehicle 705, or the pneumatic conveying system consisting of the lower silo pump system 606 of the mineral powder ash silo and the mineral powder external conveying pipeline 607, or the pneumatic conveying system consisting of the lower silo pump system 706 of the coke powder ash silo and the coke powder external conveying pipeline 707, the mineral powder dust or coke powder dust can be transported to their respective demand points to maximize utilization.

[0039] Moreover, the entire route uses a pneumatic conveying system for transporting dust, which not only has a great beneficial effect on environmental protection, but also enables zero-landing turnover of dust, making it faster and more convenient. The mineral powder dust collection system 1 and the coke powder dust collection system 2 share a single exhaust system, which is more conducive to the centralized control of the entire dust collection system and saves investment costs and operating and maintenance costs for dust collection system renovation. By recovering mineral powder and coke powder separately, the energy consumption of dust collection equipment during dust ash sintering and reuse can be reduced, and the utilization value of mineral powder and coke powder can be maximized.

[0040] The above are all preferred embodiments of the present invention and are not intended to limit the scope of protection of the present invention. Therefore, all equivalent changes made in accordance with the structure, shape and principle of the present invention should be covered within the scope of protection of the present invention.

Claims

1. A coke and ore separation and dust removal system for a blast furnace ironmaking plant, characterized in that: It includes a mineral dust collection system (1), a coke dust collection system (2) and a dust collector (3). The pipe of the mineral dust collection system (1) is connected to the main flue inlet of the dust collector (3), the pipe of the coke dust collection system (2) is connected to the ash hopper inlet of the dust collector (3), and the outlet of the dust collector (3) is connected to an induced draft system, a mineral dust conveying system (6) and a coke dust conveying system (7).

2. The coke and ore separation and dust removal system for blast furnace ironmaking plants according to claim 1, characterized in that: The mineral dust collection system (1) includes a main mineral dust collection pipeline (107) and several mineral dust collection points. Several mineral dust collection points are connected to the main mineral dust collection pipeline (107) by mineral dust branch pipelines. The outlet of the main mineral dust collection pipeline (107) is connected to the inlet of the main flue of the dust collector (3).

3. The coke and ore separation and dust removal system for blast furnace ironmaking plants according to claim 2, characterized in that: The dust removal points for mineral powder include the dust removal points for blast furnace ore bins (101), the dust removal points for transfer stations and belt conveyors (102), and / or the dust removal points for material yards (103).

4. The coke and ore separation and dust removal system for blast furnace ironmaking plants according to claim 1, characterized in that: The coke dust collection system (2) includes a main coke dust collection pipeline (207) and several coke dust collection points. The coke dust collection points are connected to the main coke dust collection pipeline (207) by coke branch pipelines. The outlet of the main coke dust collection pipeline (207) is connected to several coke dust collection branch pipelines (208). The coke dust collection branch pipelines (208) are connected to the dust collector (3) ash hopper inlet.

5. The coke and ore separation and dust removal system for blast furnace ironmaking plants according to claim 4, characterized in that: The coke dust removal points include the coke dust removal points in the blast furnace ore bins (201), the coke dust removal points in the transfer stations and belt conveyors (202), and / or the coke dust removal points in the stockyards (203).

6. The coke and ore separation and dust removal system for blast furnace ironmaking plants according to claim 1, characterized in that: The exhaust system includes a fan motor unit (4) and a chimney (5). The fan motor unit (4) is connected to the dust collector (3) by a fan inlet pipe (401), and the fan motor unit (4) is connected to the chimney (5) by a fan outlet pipe (402).

7. The coke and ore separation and dust removal system for blast furnace ironmaking plants according to claim 1, characterized in that: The mineral powder conveying system (6) includes a lower silo pump system (601) for the mineral powder ash hopper and a mineral powder ash silo (603). A pneumatic conveying pipeline (602) from the mineral powder ash hopper to the ash silo is connected between the lower silo pump system (601) for the mineral powder ash hopper and the mineral powder ash silo (603).

8. The coke and ore separation and dust removal system for blast furnace ironmaking plants according to claim 7, characterized in that: One outlet of the ore powder ash silo (603) is connected to the ore powder granular material transport vehicle (605) via the ore powder ash silo and the powder granular material transport vehicle receiving device (604). The other outlet of the ore powder ash silo (603) is connected to the sintering batching dust removal ash silo (608) via the ore powder ash silo lower silo pump system (606) and the ore powder external delivery pipeline (607).

9. The coke and ore separation and dust removal system for blast furnace ironmaking plants according to claim 1, characterized in that: The coke powder conveying system (7) includes a coke powder ash hopper lower silo pump system (701) and a coke powder ash silo (703). A pneumatic conveying pipeline (702) from the coke powder ash hopper to the ash silo is connected between the coke powder ash hopper lower silo pump system (701) and the coke powder ash silo (703).

10. The coke and ore separation and dust removal system for blast furnace ironmaking plants according to claim 9, characterized in that: One outlet of the coke powder ash silo (703) is connected to a coke powder granular material transport vehicle (705) via a coke powder ash silo and a powder material transport vehicle receiving device (704). The other outlet of the coke powder ash silo (703) is connected to a pulverized coal silo (708) in the blast furnace pulverized coal injection workshop via a coke powder ash silo lower silo pump system (706) and a coke powder external delivery pipeline (707).

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