CN219010343U - Coal injection and pulverizing system of blast furnace - Google Patents
Coal injection and pulverizing system of blast furnace Download PDFInfo
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- CN219010343U CN219010343U CN202223481494.9U CN202223481494U CN219010343U CN 219010343 U CN219010343 U CN 219010343U CN 202223481494 U CN202223481494 U CN 202223481494U CN 219010343 U CN219010343 U CN 219010343U
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Abstract
The utility model belongs to the technical field of blast furnace ironmaking coal injection, and relates to a blast furnace coal injection pulverizing system, which comprises a raw coal bin, an electronic weighing type coal feeder, a coal mill, a cloth bag powder collector, a pulverized coal bin, a gas furnace and a pulverized coal discharge fan, wherein the raw coal bin, the electronic weighing type coal feeder, the coal mill, the cloth bag powder collector and the pulverized coal bin are connected through pipelines in sequence; the coal mill is provided with a smoke inlet, and the smoke furnace is connected with the smoke inlet through a pipeline; the cloth bag powder collector is also provided with a smoke outlet, and the powder discharge fan is connected with the smoke outlet through a pipeline. The raw coal bin is connected with a circulating flue gas pipeline, the dust exhaust fan is communicated with the raw coal bin through the circulating flue gas pipeline, and flue gas exhausted by the dust exhaust fan enters the raw coal bin through the circulating flue gas pipeline to preheat and dry raw coal. The utility model dries coal powder by utilizing the tail gas of the gas furnace, and uses the tail gas for preheating raw coal by circulating through the circulating gas pipeline, thereby saving the gas consumption of the blast furnace and the power consumption of the coal mill.
Description
Technical Field
The utility model belongs to the technical field of blast furnace ironmaking coal injection, and relates to a blast furnace coal injection and pulverizing system.
Background
Blast furnace coal injection is widely used by iron and steel enterprises as one of the most effective ways to replace metallurgical coke. The technology not only can reduce the coke consumption of the blast furnace, but also can improve the working condition of the blast furnace as an operation means of regulating the lower part of blast furnace smelting, and provides favorable conditions for the operation of the blast furnace such as high wind temperature, high oxygen enrichment and the like.
At present, in the production process of a blast furnace coal injection system, the phenomenon that the raw coal supply of a coal mill is interrupted due to coal blockage at the outlet of a raw coal bin often occurs, so that the overhaul workload is increased for operators, and the safe and stable operation of a coal pulverizing system is also influenced. According to analysis of related data, if the moisture content of raw coal is high, raw coal particles can be bonded into clusters, and meanwhile, partial mineral substances in the raw coal, which are easy to absorb water, can absorb water and expand, so that the cohesiveness of the raw coal is increased, and the poor fluidity of the raw coal is a main cause of coal blockage. In addition, according to practical production experience, freezing of raw coal with high water content in winter can have a great influence on normal production of a pulverizing system.
Aiming at the problems existing in the current production practice, domestic metallurgical workers sequentially put forward solutions, namely, drying moisture in raw coal by adopting waste heat of waste flue gas, such as patents of a preheating and dehydrating process for raw coal for blast furnace injection (application number: 201310127972.2), a simple raw coal drying process for blast furnace injection (application number: 20131028127.7) and a raw coal drying device for blast furnace injection (application number: 201320185482.3). In the implementation process, external industrial waste gas such as one or more of waste gas of a hot blast furnace, waste gas of a steel rolling heating furnace, waste gas of a sintering circular cooler, waste gas of a sintering furnace and waste gas of a coke furnace (the temperature range is 110-180 ℃) is adopted, and waste gas waste heat generated by a coal injection process pulverizing system of a blast furnace is not recycled.
Disclosure of Invention
In view of the above, the utility model aims to solve the problems of coal dust drying and energy recycling, and provides a blast furnace coal injection pulverizing system.
In order to achieve the above purpose, the present utility model provides the following technical solutions:
the blast furnace coal injection and pulverizing system comprises a raw coal bin, an electronic weighing coal feeder, a coal mill, a cloth bag powder collector, a coal powder bin, a gas furnace and a powder discharge fan which are connected in sequence through a pipeline, wherein high-temperature flue gas in the gas furnace is used for heating and drying coal powder; the coal mill is provided with a smoke inlet, and the smoke furnace is connected with the smoke inlet through a pipeline; and the cloth bag powder collector is also provided with a smoke outlet, and the powder discharge fan is connected with the smoke outlet through a pipeline.
Further, the raw coal bin is connected with a circulating flue gas pipeline, the dust exhaust fan is communicated with the raw coal bin through the circulating flue gas pipeline, and flue gas exhausted by the dust exhaust fan enters the raw coal bin through the circulating flue gas pipeline to preheat and dry raw coal.
Further, a single dust remover is arranged on the raw coal bin, and the flue gas after raw coal preheating is filtered and purified by the single dust remover and then discharged at high altitude.
Further, a connecting pipeline is arranged on the raw coal bin, the connecting pipeline comprises an annular pipe and a branch pipe, the annular pipe comprises two semi-annular pipes symmetrically arranged on the raw coal bin, two ends of each semi-annular pipe are communicated with the raw coal bin, and the two semi-annular pipes are communicated through the branch pipe; the circulating flue gas pipeline is connected with the branch pipe or the annular pipe.
Further, a smoke exhaust pipeline is arranged on an air outlet of the powder discharge fan, and the circulating smoke pipeline is connected with the smoke exhaust pipeline through a cut-off valve.
Further, a cut-off valve is also arranged on a pipeline between the raw coal bin and the electronic weighing type coal feeder.
Further, a wood dust separator is arranged on a pipeline between the cloth bag powder collector and the coal dust bin.
The utility model has the beneficial effects that:
1. the utility model utilizes the flue gas furnace to dry the coal dust, and uses the tail gas for preheating the raw coal through the circulation flue gas pipeline in a circulating way, thereby saving the consumption of blast furnace gas and the power consumption of a coal mill.
2. The utility model simplifies the flow of the raw coal preheating system, reduces the equipment investment of pipelines, valves and the like, can reform the existing blast furnace coal injection and pulverizing system, has wide application range and is not limited by an external waste gas source.
Additional advantages, objects, and features of the utility model will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the utility model. The objects and other advantages of the utility model may be realized and obtained by means of the instrumentalities and combinations particularly pointed out in the specification.
Drawings
For the purpose of making the objects, technical solutions and advantages of the present utility model more apparent, the present utility model will be described in the following preferred detail with reference to the accompanying drawings, in which:
FIG. 1 is an overall schematic diagram of a coal injection and pulverizing system for a blast furnace according to the present utility model.
Reference numerals: 1-a monomer dust remover; 2-raw coal bin; 3-a first shut-off valve; 4-electronic weighing coal feeder; 5-coal discharging main pipe; 6-smoke furnace; 7-coal mill; 8-circulating flue gas pipelines; 9-a cloth bag powder collector; a 10-wood chip separator; 11-a coal dust bin; 12-a powder discharge fan; 13-a smoke exhaust duct; 14-a second shut-off valve; 81-semi-circular ring; 82-branch pipes.
Detailed Description
Other advantages and effects of the present utility model will become apparent to those skilled in the art from the following disclosure, which describes the embodiments of the present utility model with reference to specific examples. The utility model may be practiced or carried out in other embodiments that depart from the specific details, and the details of the present description may be modified or varied from the spirit and scope of the present utility model. It should be noted that the illustrations provided in the following embodiments merely illustrate the basic idea of the present utility model by way of illustration, and the following embodiments and features in the embodiments may be combined with each other without conflict.
Wherein the drawings are for illustrative purposes only and are shown in schematic, non-physical, and not intended to limit the utility model; for the purpose of better illustrating embodiments of the utility model, certain elements of the drawings may be omitted, enlarged or reduced and do not represent the size of the actual product; it will be appreciated by those skilled in the art that certain well-known structures in the drawings and descriptions thereof may be omitted.
The same or similar reference numbers in the drawings of embodiments of the utility model correspond to the same or similar components; in the description of the present utility model, it should be understood that, if there are terms such as "upper", "lower", "left", "right", "front", "rear", etc., that indicate an azimuth or a positional relationship based on the azimuth or the positional relationship shown in the drawings, it is only for convenience of describing the present utility model and simplifying the description, but not for indicating or suggesting that the referred device or element must have a specific azimuth, be constructed and operated in a specific azimuth, so that the terms describing the positional relationship in the drawings are merely for exemplary illustration and should not be construed as limiting the present utility model, and that the specific meaning of the above terms may be understood by those of ordinary skill in the art according to the specific circumstances.
Referring to fig. 1, a blast furnace coal injection and pulverizing system comprises a raw coal bin 2, an electronic weighing type coal feeder 4, a coal mill 7, a cloth bag powder collector 9, a coal powder bin 11, a flue gas furnace 6, a powder discharge fan 12, and a high-temperature flue gas in the flue gas furnace 6 for heating and drying coal powder, wherein the raw coal bin 2, the electronic weighing type coal feeder 4, the coal mill 7, the cloth bag powder collector 9 and the coal powder bin 11 are connected in sequence through pipelines; the electronic weighing type coal feeder 4 is connected with the coal mill 7 through a lower main coal pipe 5, a smoke inlet is formed in the coal mill 7, and the smoke furnace 6 is connected with the smoke inlet through a pipeline; the cloth bag powder collector 9 is also provided with a smoke outlet, and the powder discharge fan 12 is connected with the smoke outlet through a pipeline. The raw coal bin 2 is connected with a circulating flue gas pipeline 8, a dust exhaust fan 12 is communicated with the raw coal bin 2 through the circulating flue gas pipeline 8, and flue gas exhausted by the dust exhaust fan 12 enters the raw coal bin 2 through the circulating flue gas pipeline 8 to preheat and dry raw coal. The top of the raw coal bin 2 is also provided with a single dust remover 1, and the flue gas after raw coal preheating is filtered and purified by the single dust remover 1 and then discharged at high altitude. The lower cone part of the raw coal bin 2 is provided with a connecting pipeline, the connecting pipeline comprises an annular pipe and a branch pipe 82, the annular pipe comprises two semi-annular pipes 81 symmetrically arranged on the raw coal bin 2, two ends of each semi-annular pipe 81 are communicated with the raw coal bin 2, and the two semi-annular pipes 81 are communicated through the branch pipe 82; the circulating flue gas duct 8 communicates with a branch pipe 82.
Wherein, install first trip valve 3 on the pipeline between former coal bunker 2 and the electronic weighing feeder 4. A smoke exhaust pipeline 13 is arranged on the air outlet of the powder discharge fan 12, and the circulating smoke pipeline 8 is connected with the smoke exhaust pipeline 13 through a second cut-off valve 14. A wood dust separator 10 is arranged on a pipeline between the cloth bag powder collector 9 and the coal dust bin 11.
The high temperature flue gas exhausted by the flue gas furnace 6 is firstly dried by coal mill 7 and cloth bag powder collector 9, and then is exhausted to a smoke exhaust pipeline 13 or a circulating flue gas pipeline 8 by a powder exhaust fan 12, wherein the temperature range is 70-100 ℃. The flue gas enters the raw coal bin 2 through the second cut-off valve 14 and the circulating flue gas pipeline 8, raw coal in the bin is preheated, the flue gas after preheating the raw coal is filtered and purified by the single dust remover 1 and then discharged at high altitude, and the discharge concentration of the purified gas is less than or equal to 5mg/Nm 3 The raw coal particles after gas-solid separation fall back to the raw coal bin 2 under the action of gravity.
Finally, it is noted that the above embodiments are only for illustrating the technical solution of the present utility model and not for limiting the same, and although the present utility model has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications and equivalents may be made thereto without departing from the spirit and scope of the present utility model, which is intended to be covered by the claims of the present utility model.
Claims (4)
1. The utility model provides a blast furnace coal injection pulverizing system, includes raw coal bunker, electronic weighing feeder, coal pulverizer, sack powder collector, the buggy storehouse that loops through the pipe connection, its characterized in that: the device also comprises a smoke furnace and a powder discharge fan, wherein high-temperature smoke in the smoke furnace is used for heating and drying coal powder; the coal mill is provided with a smoke inlet, and the smoke furnace is connected with the smoke inlet through a pipeline; the cloth bag powder collector is also provided with a smoke outlet, and the powder discharge fan is connected with the smoke outlet through a pipeline; the raw coal bin is connected with a circulating flue gas pipeline, the dust exhaust fan is communicated with the raw coal bin through the circulating flue gas pipeline, and flue gas exhausted by the dust exhaust fan enters the raw coal bin through the circulating flue gas pipeline to preheat and dry raw coal; the raw coal bin is also provided with a single dust remover, and the flue gas after raw coal preheating is filtered and purified by the single dust remover and then discharged at high altitude;
the raw coal bin is provided with a connecting pipeline, the connecting pipeline comprises an annular pipe and a branch pipe, the annular pipe comprises two semi-annular pipes symmetrically arranged on the raw coal bin, two ends of each semi-annular pipe are communicated with the raw coal bin, and the two semi-annular pipes are communicated through the branch pipe; the circulating flue gas pipeline is connected with the branch pipe or the annular pipe.
2. The blast furnace coal-injection pulverizing system according to claim 1, wherein: and a smoke exhaust pipeline is arranged on an air outlet of the powder discharge fan, and the circulating smoke pipeline is connected with the smoke exhaust pipeline through a cut-off valve.
3. The blast furnace coal-injection pulverizing system according to claim 1, wherein: and a cut-off valve is also arranged on a pipeline between the raw coal bin and the electronic weighing type coal feeder.
4. The blast furnace coal-injection pulverizing system according to claim 1, wherein: and a wood chip separator is arranged on a pipeline between the cloth bag powder collector and the coal dust bin.
Priority Applications (1)
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CN202223481494.9U CN219010343U (en) | 2022-12-26 | 2022-12-26 | Coal injection and pulverizing system of blast furnace |
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CN202223481494.9U CN219010343U (en) | 2022-12-26 | 2022-12-26 | Coal injection and pulverizing system of blast furnace |
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