CN212451336U - System for utilize flue gas tail gas preparation buggy - Google Patents
System for utilize flue gas tail gas preparation buggy Download PDFInfo
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- CN212451336U CN212451336U CN202020592459.6U CN202020592459U CN212451336U CN 212451336 U CN212451336 U CN 212451336U CN 202020592459 U CN202020592459 U CN 202020592459U CN 212451336 U CN212451336 U CN 212451336U
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Abstract
A system for preparing coal dust by using flue gas tail gas mainly comprises a hot flue gas system, a coal dust preparation system and a coal dust collection system; the pulverized coal preparation system comprises a raw coal bin (8), a closed weighing coal feeder (10) and a crusher (11); the coal dust collecting system comprises a cyclone dust collector (12), a cloth bag dust collector (13), a dry coal bin (14) and a main exhaust fan (15); the high-temperature waste gas outlet of the hot flue gas system is communicated with a crusher (11), the outlet of the raw coal bin (8) is sequentially connected with a closed weighing coal feeder (10) and the crusher (11), then the outlet of the crusher is sequentially connected with a cyclone dust collector (12) and a cloth bag powder collector (13) of a pulverized coal collecting system through pipelines, and the lower part of the cloth bag powder collector (13) is connected with a dry coal bin (14); the main exhaust ventilator (15) is connected with the air outlet of the cloth bag powder collecting device (13).
Description
Technical Field
The utility model relates to a non-blast furnace melting ironmaking field relates to a buggy preparation and dust pelletizing system, especially an utilize flue gas tail gas to be used for buggy preparation and dust pelletizing system of smelting reduction furnace.
Background
Coal powder preparation is a coal processing mode commonly adopted in the industries of metallurgy, electric power, chemical industry and the like, and is generally divided into a wet preparation process and a dry preparation process. The method is mainly used for blast furnace coal powder injection in the metallurgical industry, and the position of the method in the iron-making process is gradually improved along with continuous improvement and perfection of the blast furnace coal powder injection key technology. The blast furnace coal injection powder is prepared by directly injecting pulverized coal into a blast furnace through a blast furnace tuyere to replace part of coke, and can provide heat and serve as a reducing agent, so that the coke ratio is reduced, the pig iron cost is reduced, the production amount of a newly-built coke oven and coke can be reduced, the pollution of coking production to the environment is reduced, the blast furnace coal injection ratio is continuously increased, and the pulverized coal becomes an important means for energy conservation and emission reduction in the steel industry in recent years. However, due to the special skeleton action of the coke in the blast furnace, the pulverized coal injected into the blast furnace cannot completely replace the coke, and only can be beneficial supplement for cost reduction and efficiency improvement of the blast furnace.
At present, the smelting reduction method adopts a mode of directly blowing coal powder, nitrogen is used as carrier gas to spray the coal powder into a smelting reduction furnace, and the coal powder is used as a reducing agent and molten iron for carbon supplement through carburization of the coal powder in molten iron. In order to achieve the effect of deep pulverized coal injection, the particle size and the particle size distribution of pulverized coal are controlled, and the particle coal injection is adopted, which is different from the blast furnace pulverized coal injection, the finer the blast furnace pulverized coal is, the more the blast furnace pulverized coal is injected, the blast furnace pulverized coal can be immediately combusted, and the different subsequent pulverized coal collection modes are determined. The tail gas components and heat values generated by smelting reduction iron making and blast furnace iron making are greatly different, so that the control of a flue gas furnace is greatly different. Therefore, in order to realize continuous, efficient and safe coal powder preparation and collection, the whole coal powder preparation system is urgently needed to be modified and upgraded.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide an utilize flue gas tail gas to be used for pulverized coal preparation and dust pelletizing system of smelting reduction furnace for solve the problem that exists among the prior art. The process is a production process specially providing qualified coal powder for a smelting reduction furnace, and has different processes and purposes, so that the requirements on the particle size distribution and the moisture control of the coal powder, the adopted waste gas components and heat value, the coal powder collection mode and the like are different from a blast furnace coal injection system. The method can effectively utilize gases such as clean gas of a smelting reduction furnace, coke oven gas, waste gas of a hot blast stove and the like in a factory, adopts a reasonable gas ratio, controls reasonable charging temperature, ensures the safety in the coal powder preparation process, finally realizes continuous, efficient and safe coal powder preparation and collection, and provides favorable conditions for subsequent coal powder injection.
In order to solve the technical problem, the utility model discloses a technical scheme as follows:
a system for preparing coal dust by using flue gas tail gas mainly comprises a hot flue gas system, a coal dust preparation system and a coal dust collection system;
the pulverized coal preparation system comprises a raw coal bin (8), a closed weighing coal feeder (10) and a crusher (11);
the coal dust collecting system comprises a cyclone dust collector (12), a cloth bag dust collector (13), a dry coal bin (14) and a main exhaust fan (15); the high-temperature waste gas outlet of the hot flue gas system is communicated with a crusher (11), the outlet of the raw coal bin (8) is sequentially connected with a closed weighing coal feeder (10) and the crusher (11), then the outlet of the crusher is sequentially connected with a cyclone dust collector (12) and a cloth bag powder collector (13) of a pulverized coal collecting system through pipelines, and the lower part of the cloth bag powder collector (13) is connected with a dry coal bin (14); the main exhaust ventilator (15) is connected with the air outlet of the cloth bag powder collecting device (13).
Further, the raw coal bunker (8) is provided with a material level meter (7) for monitoring the material level height; the raw coal bin (8) is provided with an air cannon for preventing coal dust blockage. The bottom of the raw coal bin (8) is provided with a fluidizing device (9), and the fluidizing device (9) comprises a fluidizing gas nozzle for continuously feeding fluidizing nitrogen into the raw coal bin (8); the bottom of the raw coal bin (8) is provided with a raw coal discharge port, and the discharge port is provided with a rod-shaped gate valve, so that the defects that the opening and closing pressure of a flat gate valve is large and even the flat gate valve cannot be closed due to large material particles are overcome;
furthermore, a closed weighing coal feeder is arranged below a discharge hole of the raw coal bunker (8) and used for feeding materials by a crusher (11).
Further, breaker (11) are the CPC breaker, and the breaker sets up the grid, and the grid interval is adjustable for the screening material adopts the mode of bottom discharge, saves follow-up screening plant.
Further, the hot flue gas system comprises a horizontal flue gas furnace (4), the horizontal flue gas furnace (4) is connected with the crusher through a pipeline to supply hot flue gas, the front part of the horizontal flue gas furnace (4) is a combustion chamber, and the rear part of the horizontal flue gas furnace is a mixing chamber.
Furthermore, a coke oven gas nozzle for ignition is arranged at the front part of the horizontal type flue gas furnace (4), coke oven gas is used as an ignition gas source and a long-time open fire gas source of the horizontal type flue gas furnace, a smelting reduction furnace clean gas nozzle is also arranged at the front part of the flue gas furnace, and the smelting reduction furnace clean gas and combustion-supporting air are combusted in a combustion chamber of the horizontal type flue gas furnace (4) to generate high-temperature waste gas which is mixed with hot blast stove waste gas introduced by a flue gas fan in a mixing chamber.
Furthermore, the horizontal type flue gas furnace (4) is provided with a coke oven gas interface, a smelting reduction furnace clean gas interface and a hot blast stove waste gas interface and is used for connecting external raw material gas.
Furthermore, a diffusing pipe (5) is arranged behind the horizontal type flue gas furnace (4) and is used for diffusing after the system is shut down.
Further, a screw feeder is arranged below the cyclone dust collector (12) and used for collecting the coal dust to enter the dry coal bin (14). The cloth bag powder collector (13) directly enters the dry coal bin (14) through the chute.
Furthermore, the dry coal bunker (14) is provided with a plurality of material level meters for monitoring the material level height and preventing the interference of water vapor and smoke gas in the blanking process of the dry coal bunker on the measurement of the material level meters.
Furthermore, a raw coal discharge port is formed in the bottom of the raw coal bin (8), a closed weighing coal feeder (10) is arranged below the discharge port, oxygen alarm devices (6) are arranged in front of and behind the crusher (11), and a carbon monoxide alarm device is arranged in the dry coal bin (14).
The utility model discloses an advantage and effect:
the utility model discloses improve and optimize to the buggy preparation technology for melting reduction furnace, utilize gas combustion such as melting reduction furnace coal gas, coke oven gas, hot-blast furnace waste gas of self-production in the factory, mix the back for the breaker heat supply, make the waste gas in the factory obtain make full use of. Aiming at the requirements of the injected coal powder on granularity, size grade and moisture, the granular coal injection is different from the blast furnace fine powder injection, a crusher is adopted for crushing and drying, and a medium speed coal mill commonly used by the blast furnace is abandoned for crushing. The subsequent cyclone dust removal process of the crusher is added to collect large particles in a cyclone dust removal mode, and the large particles are fed into the dry coal bunker through the screw feeder. Because the inner part of the crusher is provided with the grating, the vibrating screen arranged outside is not used. The gas-powder separation is realized in the cloth bag powder collector, the coal powder enters the dry coal bin, the hot air exhaust gas is sent into the desulfurizing tower through the main flue gas exhaust fan, and the hot air exhaust gas is exhausted into the atmosphere after being desulfurized and is discharged after reaching the standard. In order to safely consider the whole system, oxygen alarm devices are arranged at the front and the back of the crusher, and a carbon monoxide alarm device is arranged in the dry coal bin to prevent pulverized coal explosion.
Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by the practice of the invention. The objectives and other advantages of the invention will be realized and attained by the structure particularly pointed out in the written description and claims hereof.
Drawings
FIG. 1 is a schematic structural view of a pulverized coal preparation and dust removal system for a smelting reduction furnace using flue gas tail gas of the present invention;
FIG. 2 is a flow chart of a pulverized coal preparation and dust removal system for a smelting reduction furnace using flue gas exhaust gas of the present invention;
1-coke oven gas; 2-melting the reduction furnace gas; 3-hot blast furnace exhaust gas; 4-horizontal flue gas furnace; 5-a diffusing pipe; 6-oxygen alarm device; 7-a level gauge; 8-raw coal bunker; 9-a fluidizing device; 10-closed weighing coal feeder; 11-a crusher; 12-a cyclone dust collector; 13-a cloth bag powder collector; 14-dry coal bunker; 15-main exhaust fan.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention are clearly and completely described below. It is to be understood that the embodiments described are only some of the embodiments of the present invention, and not all of them. All other embodiments, which can be obtained by a person skilled in the art without any inventive work based on the described embodiments of the present invention, belong to the protection scope of the present invention.
The technical solution of the present invention will be further explained and illustrated with reference to the following specific embodiments.
Example 1
The coal powder pulverizing system mainly comprises a hot flue gas system, a coal powder preparation system and a coal powder collecting system. The coal powder preparation system comprises a raw coal bin, a totally-enclosed weighing coal feeder and a crusher. The hot flue gas system comprises a combustion-supporting fan, a horizontal flue gas furnace, a hot blast stove waste gas conveying pipeline, a flue gas induced draft fan, a coke oven gas conveying pipeline, a diffusing pipeline and the like. The powder collecting system comprises a cyclone dust collector, a cloth bag powder collector, a main smoke exhaust fan and a dry coal bunker. The technological process of the coal powder making system comprises the following steps: raw coal of a raw material plant is pushed into a raw coal bunker underground of the raw material plant through a forklift, weighed through a belt weigher, iron strips are removed through an iron remover, the raw coal is conveyed into a raw coal bunker of a mill through a belt conveyor, crushed and dried through a weighing coal feeder, and subjected to gas and powder separation through a cyclone powder collecting device and a cloth bag powder collecting device and then enters a dry coal powder bunker. The hot air is purified by a bag type filtering device, then enters a desulfurizing tower for treatment and is discharged into the atmosphere.
The pulverized coal can be anthracite or bituminous coal, the granularity of the pulverized coal is less than or equal to 40mm, the moisture content is less than or equal to 12 percent,
a material level meter is arranged in the raw coal bin and used for monitoring the height of the material level; an air cannon is arranged on the raw coal bin to prevent coal dust from being blocked; in order to ensure the rapid and uniform powder discharge, a fluidizing gas nozzle is arranged at the bottom of the coal powder bin, and fluidized nitrogen continuously enters the coal powder bin; the bottom of the raw coal bin is provided with a raw coal discharge port, the discharge port is provided with a rod-shaped gate valve, and a closed weighing coal feeder is arranged below the discharge port and used for feeding by a crusher, wherein the normal coal supply is 100t/h, and the maximum coal supply is 120 t/h.
The CPC crusher is adopted in the coal mill instead of a medium-speed coal mill or a ball mill which is usually adopted in blast furnace coal production, so that the requirement on the particle size of dry coal powder required by the smelting reduction furnace can be obtained, and the operation cost of raw material treatment can be reduced. The crusher is provided with the grids, the intervals of the grids are adjustable, a downward discharging mode is adopted, and the granularity of the pulverized coal after the pulverized coal is discharged out of the crusher can meet the requirement. The high-speed coal mill in the blast furnace generally adopts an upper discharging mode without a grid, and in order to ensure that the particle size of dry coal meets the requirement, a screening device is additionally arranged subsequently to screen the coal powder.
The horizontal flue gas furnace is connected with the crusher through a pipeline to supply hot flue gas, the front part of the flue gas furnace is a combustion chamber, and the rear part of the flue gas furnace is a mixing chamber. The horizontal flue gas furnace can effectively utilize gases such as clean coal gas of a smelting reduction furnace, coke oven gas, hot blast stove waste gas and the like in a plant, one part of the clean coal gas of the smelting reduction furnace is used for a coal powder preparation system, and the consumption of the part of the coal gas accounts for 30-45% of the total coal gas. The foremost ignition device of the flue gas furnace is a coke oven gas nozzle for ignition, and the coke oven gas is used as an ignition gas source and an ever-burning flame gas source of the horizontal flue gas furnace. Clean coal gas of the smelting reduction furnace and combustion-supporting air are combusted in a combustion chamber of a horizontal type flue gas furnace to generate high-temperature waste gas, the temperature is 800-1200 ℃, the high-temperature waste gas and low-temperature waste gas (100-150 ℃) generated by a large amount of hot blast stoves introduced by a flue gas fan are mixed in a mixing chamber, hot flue gas at the temperature of 400-450 ℃ is generated by proper proportioning, the hot flue gas enters a pulverized coal crusher to dry pulverized coal, the processing capacity of the crusher is not less than 80t/h, and the maximum processing capacity is 100 t/h. Both the waste flue gas of the hot blast stove and the high-temperature waste gas generated by the combustion chamber are products of melting reduction furnace gas, so the components are basically the same, the properties are the same, only the waste gas of the hot blast stove contains higher water vapor and lower temperature, and the high-temperature waste gas generated by the combustion chamber contains higher oxygen and higher temperature.
And a diffusing pipe is arranged behind the horizontal flue gas furnace and used for diffusing after the system is shut down.
The coal dust collecting system is arranged in the follow-up of the crusher, the temperature of the coal dust after the coal dust is discharged from the crusher is 100-120 ℃, the coal dust collecting system comprises a cyclone dust collector and a cloth bag dust collector, and the cyclone dust collector is not generally arranged in the blast furnace coal dust preparation system because the blast furnace coal dust is fine in particle size and does not need to be separated by the cyclone dust collector. The dry coal powder for blowing in the smelting reduction furnace has larger particle size, most of the dry coal powder can be collected by a cyclone dust collector, and the cyclone efficiency is more than or equal to 90 percent. Gas-powder separation is realized in the cloth bag powder collector, and the coal powder is separated from the dry gas and stored in the dry coal bunker. A screw feeder is arranged below the cyclone dust collector and is used for collecting the pulverized coal to enter the dry coal bunker. The cloth bag powder collector directly enters the dry coal bin through the chute.
The main smoke exhaust fan is a main device of the powder collecting system, is a power source for gas-solid two-phase flow flowing of carrier gas and powder in the whole powder making system, and ensures that the powder making system is in a negative pressure working state.
And finally, the tail gas of the flue gas enters a desulfurizing tower to be treated and then is discharged into the atmosphere.
The injected coal powder is dry coal powder obtained by crushing and drying, and the particle size of the dry coal powder is as follows: 90 percent is less than or equal to 3mm, 80 percent is less than or equal to 2mm, and 50 percent is less than or equal to 0.5 mm. The water content of the dry coal powder is less than or equal to 2 percent and is controlled to be less than 1.5 percent as much as possible so as to reduce the blockage of the coal powder in a conveying pipeline and an injection pipeline.
In order to ensure the safe and stable operation of the pulverized coal preparation system, O is arranged at the front and the rear of the crusher2And a CO alarm device. The oxygen content O before entering the mill is required2Less than or equal to 8 percent; to dry coal bunker O2And CO concentration, oxygen content O2<12 percent and the CO concentration of 300ppm is the upper limit for alarming.
Although the embodiments of the present invention have been described above, the description is only for the convenience of understanding the present invention, and the present invention is not limited thereto. It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (10)
1. A system for preparing pulverized coal by using flue gas tail gas is characterized by mainly comprising a hot flue gas system, a pulverized coal preparation system and a pulverized coal collection system;
the pulverized coal preparation system comprises a raw coal bin (8), a closed weighing coal feeder (10) and a crusher (11);
the coal dust collecting system comprises a cyclone dust collector (12), a cloth bag dust collector (13), a dry coal bin (14) and a main exhaust fan (15); the high-temperature waste gas outlet of the hot flue gas system is communicated with a crusher (11), the outlet of the raw coal bin (8) is sequentially connected with a closed weighing coal feeder (10) and the crusher (11), then the outlet of the crusher is sequentially connected with a cyclone dust collector (12) and a cloth bag powder collector (13) of a pulverized coal collecting system through pipelines, and the lower part of the cloth bag powder collector (13) is connected with a dry coal bin (14); the main exhaust ventilator (15) is connected with the air outlet of the cloth bag powder collecting device (13).
2. The system for preparing pulverized coal by using flue gas exhaust gas as claimed in claim 1, wherein the raw coal bunker (8) is provided with a material level meter (7) for monitoring material level height; the raw coal bin (8) is provided with an air cannon for preventing coal dust blockage.
3. The system for preparing pulverized coal using flue gas tail gas according to claim 2, wherein a fluidizing device (9) is installed at the bottom of the raw coal bunker (8), and the fluidizing device (9) comprises a fluidizing gas nozzle for continuously feeding fluidizing nitrogen into the raw coal bunker (8); the bottom of the raw coal bin (8) is provided with a raw coal discharge port, the discharge port is provided with a rod-shaped gate valve, and a closed weighing coal feeder is arranged below the discharge port and used for feeding by a crusher (11).
4. The system for preparing pulverized coal by using flue gas tail gas as claimed in claim 3, wherein the crusher (11) is a CPC crusher, the crusher is provided with a grating, the distance between the gratings can be adjusted, the grating is used for sieving materials, and a downward discharging mode is adopted.
5. The system for preparing pulverized coal by using flue gas exhaust gas as claimed in claim 4, wherein the hot flue gas system comprises a horizontal flue gas furnace (4), the horizontal flue gas furnace (4) is connected with a crusher through a pipeline to supply hot flue gas, the front part of the horizontal flue gas furnace (4) is a combustion chamber, and the rear part of the horizontal flue gas furnace is a mixing chamber.
6. The system for preparing pulverized coal by using flue gas tail gas as claimed in claim 5, wherein the front part of the horizontal flue gas furnace (4) is provided with an ignition device and a coke oven gas nozzle, the coke oven gas is used as an ignition gas source and a pilot fire gas source of the horizontal flue gas furnace, the front part of the flue gas furnace is also provided with a smelting reduction furnace clean gas nozzle, and the smelting reduction furnace clean gas and combustion-supporting air are combusted in a combustion chamber of the horizontal flue gas furnace (4) to generate high-temperature waste gas which is mixed with hot blast stove waste gas introduced by a flue gas blower in a mixing chamber.
7. The system for preparing pulverized coal using flue gas exhaust gas according to claim 6, wherein the horizontal flue gas furnace (4) is provided with a coke oven gas interface, a smelting reduction furnace clean gas interface, and a hot blast stove exhaust gas interface for connecting with external raw material gas.
8. The system for preparing pulverized coal by using flue gas exhaust gas as claimed in claim 7, wherein a diffusing pipe (5) is arranged behind the horizontal flue gas furnace (4) and used for diffusing after the system is shut down.
9. The system for preparing the pulverized coal by using the flue gas tail gas as claimed in claim 8, wherein a screw feeder is arranged below the cyclone dust collector (12) and used for collecting the pulverized coal to enter the dry coal bin (14); the cloth bag powder collecting device (13) directly enters the dry coal bunker (14) through the chute, and the dry coal bunker (14) is provided with a plurality of material level meters for monitoring the material level height.
10. The system for preparing pulverized coal by using flue gas tail gas as claimed in claim 9, wherein a raw coal discharge port is arranged at the bottom of the raw coal bunker (8), a closed weighing coal feeder (10) is arranged below the discharge port, oxygen alarm devices (6) are arranged in front of and behind the crusher (11), and a carbon monoxide alarm device is arranged in the dry coal bunker (14).
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114807475A (en) * | 2022-05-30 | 2022-07-29 | 李观升 | Novel-structure coal injection device of blast furnace iron-making energy-saving low-carbon powder making and injection system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114807475A (en) * | 2022-05-30 | 2022-07-29 | 李观升 | Novel-structure coal injection device of blast furnace iron-making energy-saving low-carbon powder making and injection system |
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