CN113786921B - Blast furnace pulverized coal preheating system based on raw coal processing technology - Google Patents
Blast furnace pulverized coal preheating system based on raw coal processing technology Download PDFInfo
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- CN113786921B CN113786921B CN202110994908.9A CN202110994908A CN113786921B CN 113786921 B CN113786921 B CN 113786921B CN 202110994908 A CN202110994908 A CN 202110994908A CN 113786921 B CN113786921 B CN 113786921B
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- coal
- preheating
- flue gas
- pipeline
- blast furnace
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
- B02C21/00—Disintegrating plant with or without drying of the material
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
- B02C23/00—Auxiliary methods or auxiliary devices or accessories specially adapted for crushing or disintegrating not provided for in preceding groups or not specially adapted to apparatus covered by a single preceding group
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
- B02C23/00—Auxiliary methods or auxiliary devices or accessories specially adapted for crushing or disintegrating not provided for in preceding groups or not specially adapted to apparatus covered by a single preceding group
- B02C23/02—Feeding devices
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B5/00—Making pig-iron in the blast furnace
- C21B5/001—Injecting additional fuel or reducing agents
- C21B5/003—Injection of pulverulent coal
Abstract
The invention discloses a blast furnace pulverized coal preheating system based on a raw coal processing technology, which comprises a flue gas generator, a flue gas pipeline, a coal mill, a raw coal bunker, a coal feeder, a blast furnace pulverized coal conveying pipeline and a preheating pipeline; the flue gas outlet of the flue gas producer is connected with the inlet of a flue gas pipeline, the outlet of the flue gas pipeline is connected with the flue gas inlet of a coal pulverizer, the feed inlet of the coal pulverizer is positioned below the discharge port of the coal feeder, and the feed inlet of the coal feeder is positioned below the feed port of a raw coal bunker; the blast furnace pulverized coal conveying pipeline is communicated with a feeding hole at the lower end of the preheating pipe through a preheating front pipeline, the preheating pipe is vertically arranged in the flue gas pipeline, and a discharging hole at the upper end of the preheating pipe is communicated with the blast furnace pulverized coal conveying pipeline through a preheating rear pipeline. The invention has the beneficial effects that: the invention preheats the blast furnace pulverized coal by utilizing the existing facilities and sites for milling and the heat source in the production process of processing the raw coal into the pulverized coal and storing the pulverized coal in the pulverized coal bin, thereby saving resources.
Description
Technical Field
The invention relates to the technical field of blast furnace pulverized coal injection, in particular to a blast furnace pulverized coal preheating system based on a raw coal processing technology.
Background
The blast furnace coal powder injection is used as an energy-saving and environment-friendly technology which is widely applied to blast furnace ironmaking and is used for replacing part of coke and providing heat energy required by smelting for the blast furnace. The preheating of the coal dust can improve the combustion efficiency of the coal dust and the coal injection amount, thereby being beneficial to increasing the yield of the blast furnace and reducing the production cost of the blast furnace. The prior invention patents of the blast furnace coal powder injection preheating technology are as follows: 1) The newly-built flue gas producer and preheating system facilities are adopted, the facilities have larger occupied area, and the investment is up to 300 ten thousand yuan (coal powder injection amount: 60 t/h), the heat energy is not fully utilized; 2) The waste gas of the blast furnace hot blast stove, which needs to be added with a new site, greatly increases the length of a coal injection pipeline (due to the distance from a coal injection workshop), and part of the flue gas (temperature: 150 deg.C) directly into the atmosphere. As a result, the investment is high, the blast furnace coal injection production is not facilitated (the pressure of the injection tank needs to be increased, the nitrogen consumption needs to be increased), and partial heat energy cannot be fully utilized. 3) The self-circulation of flue gas (tail gas) of a coal powder preparation system is utilized to preheat coal powder, which is uneconomical and has low feasibility. Therefore, whether a new blast furnace coal injection preheating technology can be developed based on the existing blast furnace coal injection system facilities or not is one of the development directions of the future industries on the premise that a new site is not added, only a small amount of facilities are added, investment is saved, energy is saved, and effectiveness is fast.
Disclosure of Invention
The invention aims to provide a blast furnace pulverized coal preheating system based on a raw coal processing technology, which is energy-saving and high in heat exchange efficiency, aiming at the defects of the prior art.
The technical scheme adopted by the invention is as follows: a blast furnace pulverized coal preheating system based on a raw coal processing technology comprises a flue gas generator, a flue gas pipeline, a coal mill, a raw coal bin, a coal feeder, a blast furnace pulverized coal conveying pipeline and a preheating pipeline; the flue gas outlet of the flue gas producer is connected with the inlet of a flue gas pipeline, the outlet of the flue gas pipeline is connected with the flue gas inlet of a coal pulverizer, the feed inlet of the coal pulverizer is positioned below the discharge port of the coal feeder, and the feed inlet of the coal feeder is positioned below the feed port of a raw coal bunker; the blast furnace pulverized coal conveying pipeline is communicated with a feeding hole at the lower end of the preheating pipe through a preheating front pipeline, the preheating pipe is vertically arranged in the flue gas pipeline, and a discharging hole at the upper end of the preheating pipe is communicated with the blast furnace pulverized coal conveying pipeline through a preheating rear pipeline.
According to the scheme, the preheating pipe is a spiral pipe.
According to the scheme, the outer wall of the preheated pipeline is provided with the heat insulation layer.
According to the scheme, a thermocouple is arranged at the outlet end of the preheated pipeline.
According to the scheme, the inlet end of the preheating pipe is provided with the sliding sealing sleeve.
According to the scheme, a plurality of sliding supports connected with the side part of the preheating pipe are arranged in the flue gas pipeline along the height direction and are used for supporting the preheating pipe; the upper end of the preheating pipe is provided with a fixed bracket fixedly connected with the flue gas pipeline.
According to the scheme, the preheating pipeline is communicated with the upstream of the blast furnace coal powder conveying pipeline, the preheating pipeline is communicated with the downstream of the blast furnace coal powder conveying pipeline, and the outlet of the blast furnace coal powder conveying pipeline is communicated with the blast furnace; a coal powder conveying valve is arranged on the blast furnace coal powder conveying pipeline, and a preheating inlet valve is arranged at the outlet of the preheating front pipeline; a preheating outlet valve is additionally arranged at the inlet of the preheated pipeline.
According to the scheme, the blast furnace coal powder preheating system further comprises a bag type powder collecting device, a coal powder bin and a main exhaust fan, wherein a discharge port of the raw coal machine is communicated with an inlet of the bag type powder collecting device, a coal powder outlet at the bottom of the bag type powder collecting device is communicated with the coal powder bin through a pipeline, a flue gas outlet at the upper part of the bag type powder collecting device is communicated with an inlet of the main exhaust fan through a pipeline, and an outlet of the main exhaust fan is communicated with the atmosphere through an exhaust pipeline.
The invention has the beneficial effects that: the invention fully utilizes the advantages of the blast furnace injection system and the coal pulverizing system at the same position in the production process of processing raw coal into coal powder and storing the coal powder in the coal powder bin, and preheats the blast furnace coal powder by utilizing the existing facilities, fields and heat sources for coal pulverizing, thereby saving resources and organically integrating the coal pulverizing system and the injection system. The invention adopts the spiral pipe to preheat the blast furnace coal dust, increases the heat exchange area and enhances the convective heat exchange effect of the flue gas. According to the invention, the fixing support is arranged at the position of the preheating pipe away from the flue gas pipeline, and the position of the preheating pipe entering the flue gas pipeline adopts a packing sealing mode, so that the pipeline is allowed to move freely, the thermal expansion displacement of the preheating pipe is absorbed, the damage of the preheating pipe is prevented, and the service life of the preheating pipe is prolonged.
Drawings
Fig. 1 is a schematic structural diagram of an embodiment of the present invention.
Wherein: 1. a blast furnace coal powder conveying pipe; 2. preheating a front pipeline; 3. a pulverized coal delivery valve; 4. preheating an inlet valve; 5. a sliding seal cartridge; 6. a preheating pipe; 7. a sliding bracket; 8. fixing a bracket; 9. preheating an outlet valve; 10. preheating a rear pipeline; 11. a heat-insulating layer; 12. a flue gas generating furnace; 13. a flue gas duct; 14. a raw coal bunker; 15. a coal feeder; 16. a coal mill; 17. a bag type powder collector; 18. a pulverized coal bunker; 19. a main exhaust fan; 20. a tail gas discharge pipe; 21. a dust concentration detector; 22. and a thermocouple.
Detailed Description
For a better understanding of the present invention, reference is made to the following detailed description taken in conjunction with the accompanying drawings.
As shown in fig. 1, the blast furnace pulverized coal preheating system based on the raw coal processing technology comprises a flue gas generating furnace 12, a flue gas pipeline 13, a coal mill 16, a raw coal bunker 14, a coal feeder 15, a blast furnace pulverized coal conveying pipeline 1 and a preheating pipeline 6; the flue gas outlet of the flue gas generating furnace 12 is connected with the inlet of a flue gas pipeline 13, the outlet of the flue gas pipeline 13 is connected with the flue gas inlet of a coal mill 16, the feed inlet of the coal mill 16 is positioned below the discharge hole of a coal feeder 15, and the feed inlet of the coal feeder 15 is positioned below the feed inlet of a raw coal bunker 14; the blast furnace pulverized coal conveying pipeline 1 is communicated with an inlet at the lower end of the preheating pipe 6 through a preheating front pipeline 2, the preheating pipe 6 is vertically installed in a flue gas pipeline 13, and an outlet at the upper end of the preheating pipe 6 is communicated with the blast furnace pulverized coal conveying pipeline 1 through a preheating rear pipeline 10.
Preferably, the preheating pipe 6 is a spiral pipe.
Preferably, the outer wall of the preheated pipeline 10 is provided with a heat preservation layer 11 for heat preservation of the blast furnace pulverized coal.
Preferably, a thermocouple 22 is arranged at the outlet end of the preheated pipe 10 to detect the temperature of the preheated blast furnace pulverized coal.
Preferably, a sliding seal sleeve 5 is provided at the inlet end of the preheating pipe 6; namely, a sliding seal sleeve 5 is designed at the position where the preheating pipe 6 enters the flue gas pipeline 13, and a packing sealing mode is adopted to allow the preheating pipe 6 to move freely and absorb the thermal expansion displacement of the pulverized coal conveying pipeline.
Preferably, a plurality of sliding brackets 7 connected with the side part of the preheating pipe 6 are arranged in the flue gas pipeline 13 along the height direction and are used for supporting the preheating pipe 6; the upper end of the preheating pipe 6 is provided with a fixed bracket 8 fixedly connected with a flue gas pipeline 13.
Preferably, a dust concentration detector 21 is installed on the outer wall of the flue gas duct 13.
In the invention, a preheating front pipeline 2 is communicated with the upstream of a blast furnace coal powder conveying pipeline 1, a preheating rear pipeline 10 is communicated with the downstream of the blast furnace coal powder conveying pipeline 1, and the outlet of the blast furnace coal powder conveying pipeline 1 is communicated with a blast furnace; a pulverized coal conveying valve 3 is arranged on the blast furnace pulverized coal conveying pipeline 1, and a preheating inlet valve 4 is arranged at the outlet of the preheating front pipeline 2; a preheating outlet valve 9 is additionally arranged at the inlet of the preheating pipeline 10.
Preferably, the blast furnace pulverized coal preheating system further comprises a bag-type powder collector 17, a pulverized coal bin 18 and a main exhaust fan 19, wherein a discharge port of the raw coal machine is communicated with an inlet of the bag-type powder collector 17, a pulverized coal outlet at the bottom of the bag-type powder collector 17 is communicated with the pulverized coal bin 18 through a pipeline, a flue gas outlet at the upper part of the bag-type powder collector 17 is communicated with an inlet of the main exhaust fan 19 through a pipeline, and an outlet of the main exhaust fan 19 is communicated with the atmosphere through a tail gas discharge pipeline.
The specific production process flow of processing raw coal into pulverized coal and storing the pulverized coal in the pulverized coal bunker 18 is as follows: the flue gas producer 1212 burns the fuel and adds other cold flue gas or air to produce flue gas with proper temperature and flow rate required by the coal mill 16 for drying the coal powder; the flue gas enters a coal mill 16 through a flue gas pipeline 13; raw coal enters a coal feeder 15 from a raw coal bin 14, and is quantitatively conveyed to a coal mill 16; the coal mill 16 crushes the raw coal, the pulverized coal is heated and dried by the flue gas, the pulverized coal with qualified granularity is carried into the bag-type powder collector 17, and the collected pulverized coal enters the pulverized coal bin 18 for storage; the main exhaust fan 19 generates suction force to draw the flue gas out of the flue gas generating furnace 12 through a flue gas pipeline 13, a coal mill 16 and a bag type powder collector 17, and finally the flue gas is discharged into the atmosphere through a tail gas discharge pipe 20.
The invention adds a process link of preheating by blowing coal powder in a flue gas pipeline 13, and particularly introduces a preheating pipe 6 of a blast furnace coal powder conveying pipeline 1 into the flue gas pipeline 13 between a flue gas producer 12 and a coal mill 16: the blast furnace coal powder enters the flue gas pipeline 13 through the preheating inlet valve 4 in the preheating front pipeline 2, is heated in the preheating pipe 6, enters the blast furnace coal powder conveying pipeline 1 through the preheating outlet valve 9 and the preheating rear pipeline 10 (heat preservation through the heat preservation layer 11), and is finally conveyed into the blast furnace. When the operation of the coal powder preparation system is stopped or the preheating pipe 6 breaks down, the preheating inlet valve 4 and the preheating outlet valve 9 are closed, the coal powder conveying valve 3 is opened, and the coal powder is directly conveyed into the blast furnace without passing through the preheating pipe 6.
In the invention, when the pulverizing capacity of the pulverizing system is smaller, the diameter of the flue gas pipeline 13 needs to be increased so as to facilitate the installation of the pulverized coal preheating pipe 6, ensure the necessary bending radius of the preheating pipe 6, reduce the abrasion of the pipeline and reduce the risk of pipeline blockage.
It should be noted that the above-mentioned embodiments are only preferred embodiments of the present invention, and the present invention is not limited thereto, and although the present invention has been described in detail with reference to the embodiments, it will be apparent to those skilled in the art that modifications can be made to the technical solutions described in the above-mentioned embodiments, or equivalent substitutions of some technical features, but any modifications, equivalents, improvements and the like within the spirit and principle of the present invention shall be included in the protection scope of the present invention.
Claims (8)
1. A blast furnace pulverized coal preheating system based on a raw coal processing technology is characterized by comprising a flue gas generator, a flue gas pipeline, a coal mill, a raw coal bunker, a coal feeder, a blast furnace pulverized coal conveying pipeline and a preheating pipeline; the flue gas outlet of the flue gas producer is connected with the inlet of a flue gas pipeline, the outlet of the flue gas pipeline is connected with the flue gas inlet of a coal pulverizer, the feed inlet of the coal pulverizer is positioned below the discharge port of the coal feeder, and the feed inlet of the coal feeder is positioned below the feed port of a raw coal bunker; the blast furnace pulverized coal conveying pipeline is communicated with a feeding hole at the lower end of the preheating pipe through a preheating front pipeline, the preheating pipe is vertically arranged in the flue gas pipeline, and a discharging hole at the upper end of the preheating pipe is communicated with the blast furnace pulverized coal conveying pipeline through a preheating rear pipeline; the flue gas producer burns fuel and is added with other cold flue gas or air to produce flue gas with proper temperature and flow required by coal powder drying of the coal mill; the flue gas enters a coal mill through a flue gas pipeline; raw coal enters a coal feeder from a raw coal bin, and the raw coal is quantitatively conveyed to a coal mill; the coal mill pulverizes raw coal, heats and dries the pulverized coal through flue gas.
2. The blast furnace coal fines preheating system of claim 1, wherein the preheating tube is a spiral tube.
3. The blast furnace coal powder preheating system according to claim 1, wherein an insulating layer is provided on an outer wall of the preheated pipe.
4. The blast furnace coal fines preheating system of claim 1, wherein a thermocouple is provided at the outlet end of the post-preheating conduit.
5. The blast furnace coal fines preheating system of claim 1, wherein a sliding gland is provided at the inlet end of the preheating tube.
6. The blast furnace pulverized coal preheating system according to claim 1, wherein a plurality of sliding supports connected to the side portions of the preheating tubes are provided in the flue gas duct in the height direction for supporting the preheating tubes; the upper end of the preheating pipe is provided with a fixed bracket fixedly connected with the flue gas pipeline.
7. The blast furnace coal fines preheating system of claim 1, wherein the pre-preheating conduit is in communication with an upstream side of the blast furnace coal fines delivery conduit, the post-preheating conduit is in communication with a downstream side of the blast furnace coal fines delivery conduit, and an outlet of the blast furnace coal fines delivery conduit is in communication with the blast furnace; a coal powder conveying valve is arranged on the blast furnace coal powder conveying pipeline, and a preheating inlet valve is arranged at the outlet of the preheating front pipeline; a preheating outlet valve is additionally arranged at the inlet of the preheated pipeline.
8. The blast furnace coal powder preheating system according to claim 1, further comprising a bag-type powder collector, a coal powder bin and a main exhaust fan, wherein a discharge port of the coal mill is communicated with an inlet of the bag-type powder collector, a coal powder outlet at the bottom of the bag-type powder collector is communicated with the coal powder bin through a pipeline, a flue gas outlet at the upper part of the bag-type powder collector is communicated with an inlet of the main exhaust fan through a pipeline, and an outlet of the main exhaust fan is communicated with the atmosphere through an exhaust pipeline.
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| CN202110994908.9A CN113786921B (en) | 2021-08-27 | 2021-08-27 | Blast furnace pulverized coal preheating system based on raw coal processing technology |
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| CN202110994908.9A CN113786921B (en) | 2021-08-27 | 2021-08-27 | Blast furnace pulverized coal preheating system based on raw coal processing technology |
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| JP2005349305A (en) * | 2004-06-10 | 2005-12-22 | Kurimoto Ltd | Method of manufacturing mixed powder |
| CN101250601A (en) * | 2008-03-07 | 2008-08-27 | 山西潞安矿业(集团)有限责任公司 | Pre-heating technique of blast furnace before blowing coal powder |
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