Blast furnace top pressure-equalizing diffused gas total recovery device

Abstract

The invention belongs to the technical field of metallurgy, and particularly discloses a blast furnace top pressure-equalizing diffused coal gas total recovery device which comprises a charging bucket, a cyclone dust collector, an ejector and a dust removal tank which are communicated in sequence, and the outlet end of the dust removal tank is communicated to a clean coal gas pipe network; the outlet end of the cyclone dust collector is also communicated with a clean gas primary pressure equalizing system and a nitrogen secondary pressure equalizing system; and the outlet end of the clean gas primary pressure equalizing system is also communicated to an ejector through a pipeline. According to the blast furnace top pressure-equalizing diffused coal gas full-recovery device, when natural recovery is finished, a small amount of residual low-pressure coal gas in the charging bucket is subjected to ejection forced recovery through the ejector, the pressure in the charging bucket is reduced to micro-positive pressure within a short time through forced recovery of the ejector, then charging can be conducted, and secondary diffusion of the coal gas is avoided.

Description

Technical Field

[0001] The invention belongs to the technical field of metallurgy, and in particular relates to a blast furnace top pressure-equalizing gas full recovery device. Background Art

[0002] At present, the country has put forward higher requirements for environmental protection and low-carbon smelting in the metallurgical industry, and it is imperative to achieve "full recovery" of the coal gas released from the blast furnace top tank.

[0003] At present, large iron and steel plants generally have multiple blast furnaces, divided into 2200m 3 、2800m 3 and 3200m 3 The average daily batch number of blast furnaces is about 160 batches. The C↓O↓ feeding system is adopted. Each batch of materials is discharged twice. The average daily discharge of pressure gas from a single blast furnace is about 320 times. Assuming that each ironmaking plant has three blast furnaces, the cumulative daily discharge of standard gas from the three blast furnaces is about 106,000 Nm 3 / d, the dust content of the coal gas released from the furnace top after being dedusted by the cyclone dust collector is 10g / m 3 The average daily dust emission is about 1000kg / d. The direct release of the blast furnace top pressure-equalized gas into the air not only wastes energy, but also pollutes the environment and generates a lot of noise. It is necessary to recycle all of this gas. Summary of the invention

[0004] The purpose of the present invention is to overcome the above problems existing in the prior art and to provide a blast furnace top equalized pressure release gas full recovery device. When the natural recovery is completed, the small amount of low-pressure coal gas remaining in the material tank is ejected and forced to be recovered through the ejector. The forced recovery through the ejector reduces the pressure in the material tank to a slight positive pressure in a short time, and then loading can be carried out, thereby avoiding secondary release of coal gas.

[0005] In order to achieve the above technical objectives and the above technical effects, the present invention is implemented through the following technical solutions:

[0006] A blast furnace top pressure-equalizing and venting gas full recovery device, comprising a material tank, a cyclone dust collector, an ejector and a dust removal tank connected in sequence, wherein the outlet end of the dust removal tank is connected to a clean gas pipeline network, and the outlet end of the cyclone dust collector is also connected to a clean gas primary pressure-equalizing system and a nitrogen secondary pressure-equalizing system;

[0007] The outlet end of the clean coal gas primary pressure equalization system is also connected to the ejector through a pipeline.

[0008] Furthermore, the outlet end of the cyclone dust collector is connected to a muffler through a pipeline.

[0009] Furthermore, two valves five are provided on the pipeline between the cyclone dust collector and the muffler.

[0010] Furthermore, the cyclone dust collector is connected to the ejector via a pipeline;

[0011] A valve four is provided on the pipeline between the cyclone dust collector and the ejector.

[0012] Furthermore, one end of the material tank close to the top of the material tank is connected to a pipe 1, the other end of the pipe 1 is connected to the bottom of the cyclone dust collector, and one end of the pipe 1 close to the cyclone dust collector is provided with a valve 1;

[0013] One end of the pipeline 1 close to the material tank is connected to the pipeline 2, and the other end of the pipeline 2 is connected to the cyclone dust collector.

[0014] Furthermore, the valve 1 is a check valve.

[0015] Furthermore, a valve three is provided on one end of the pipeline two close to the cyclone dust collector.

[0016] Furthermore, an ejector valve is provided on the pipeline connecting the outlet end of the clean coal gas primary pressure equalization system and the ejector.

[0017] Furthermore, a filter bag is provided at the upper end of the dust removal tank, and a buffer area connected to the filter bag is provided at the lower end of the dust removal tank.

[0018] Furthermore, a back-blowing device is also provided on the filter bag.

[0019] Compared with the prior art, the present invention has the following beneficial effects:

[0020] 1. The present invention provides a blast furnace top equalized pressure release gas full recovery device. When the natural recovery is completed, the small amount of low-pressure gas remaining in the material tank is ejected and forced to be recovered through the ejector. The forced recovery through the ejector reduces the pressure in the material tank to a slight positive pressure in a short time, and then loading can be carried out, avoiding secondary release of gas.

[0021] 2. In the present invention, by providing an ejection valve, valve one, valve three, valve four and valve five, in actual application, by adjusting the corresponding valves, the pressure-equalized released raw coal gas can enter the cyclone dust collector, and the pressure-equalized released raw coal gas can be transported to the dust removal tank through the cyclone dust collector. The pressure-equalized released raw coal gas is buffered by the buffer area of ​​the dust removal tank to prevent escape, and then filtered by the filter bag. The filtered pressure-equalized released raw coal gas enters the clean gas pipeline network and can be reused, while the dust is discharged from the bottom of the dust removal tank and can be further utilized or recycled.

[0022] 3. In the present invention, a pipeline 2 is opened on the pipeline 1 connecting the material tank and the cyclone dust collector, and valves are arranged on both the pipeline 1 and the pipeline 2. The positions where the pipeline 1 and the pipeline 2 enter the cyclone dust collector are different, so the position where the gas in the material tank enters the cyclone dust collector can be switched by different valves.

[0023] 4. In the present invention, a silencer is provided, so in the actual application process, the relevant noise pollution of the full recovery device can be basically eliminated; in addition, since an ejector is provided for forced recovery, the pressure in the material tank can be reduced to a slight positive pressure in a short time, so the recovery process is short, has no impact on the loading operation, and the dust content of the recovered coal gas is low. These positive effects can further eliminate the noise of coal gas emission, thereby extending the service life of the silencer equipment.

[0024] 5. In the present invention, a pressure equalization system is provided, so the whole recovery process has no influence on the clean gas pipeline network and will not cause pressure fluctuation of the clean gas pipeline network, thereby ensuring the continuous production. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The drawings described herein are used to provide a further understanding of the present invention and constitute a part of this application. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0026] Figure 1 It is a structural schematic diagram of a blast furnace top pressure-equalizing gas release and full recovery device provided by the present invention. DETAILED DESCRIPTION

[0027] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0028] In the description of the present invention, it should be understood that the terms "opening", "upper", "lower", "thickness", "top", "middle", "length", "inside", "all around" and the like indicating orientation or positional relationship are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the components or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0029] like Figure 1As shown, a blast furnace top pressure-equalizing and venting gas full recovery device comprises a material tank 1, a cyclone dust collector 2, an ejector 3 and a dust removal tank 4 which are connected in sequence, the outlet end of the dust removal tank 4 is connected to a clean gas pipeline network 5, and the outlet end of the cyclone dust collector 2 is also connected to a clean gas primary pressure-equalizing system 6 and a nitrogen secondary pressure-equalizing system 7;

[0030] The outlet end of the clean gas primary pressure equalization system 5 is also connected to the ejector 3 through a pipeline;

[0031] Specifically, one end of the material tank 1 close to the top of the material tank 1 is connected to a pipe 100, and the other end of the pipe 100 is connected to the bottom of the cyclone dust collector 2. A valve 20 is provided on one end of the pipe 100 close to the cyclone dust collector 2;

[0032] One end of the pipeline 100 close to the material tank 1 is connected to the pipeline 200, and the other end of the pipeline 200 is connected to the cyclone dust collector 2; the valve 1 20 is a check valve, and the end of the pipeline 200 close to the cyclone dust collector 2 is provided with a valve 300;

[0033] The ejector 3 and the dust removal tank 4 are connected via a pipeline;

[0034] During the normal operation of the blast furnace, before each loading of the blast furnace, the furnace top material tank performs a stamping operation on the symmetrical material tank (i.e., material tank 1) to balance the pressure in material tank 1 and the furnace top pressure; during this process, valve 1 20 is opened and valve 3 300 is closed. Since valve 1 20 is a check valve, it can effectively prevent the leakage or escape of materials during the loading process; after the blast furnace is loaded, the high-pressure coal gas in material tank 1 is recycled; in addition, the pipe 1 100 is connected to one end of the bottom of the cyclone dust collector 2, the pipe 2 200 is connected to one end of the cyclone dust collector 2, and the ejector 3 is connected to the dust removal tank 4. The pipe diameters are all enlarged. This is to reduce the impact of the high-speed dust-containing airflow on the cyclone dust collector 2 and the dust removal tank 4 in the early stage, and prevent secondary dust;

[0035] An ejector valve 10 is also provided on the pipeline connecting the outlet end of the clean gas primary pressure equalizing system 5 and the ejector 3 .

[0036] like Figure 1 As shown, in one embodiment of the present invention, the outlet end of the cyclone dust collector 2 is also connected to a muffler 8 through a pipeline; two valves 500 are provided on the pipeline between the cyclone dust collector 2 and the muffler 8;

[0037] A silencer 8 is provided, so in actual application, the relevant noise pollution of the full recovery device can be basically eliminated; in addition, since an ejector is provided for forced recovery, the pressure in the material tank can be reduced to a slight positive pressure in a short time, so the recovery process is short, has no impact on the loading operation, and the dust content of the recovered coal gas is low. These positive effects can further eliminate the noise of coal gas emission, thereby extending the service life of the silencer equipment.

[0038] like Figure 1 As shown, in one embodiment of the present invention, the cyclone dust collector 2 and the ejector 3 are connected via a pipeline;

[0039] A valve 400 is provided on the pipeline between the cyclone dust collector 2 and the ejector 3.

[0040] like Figure 1 As shown, in one embodiment of the present invention, a filter bag 41 is provided at the upper end of the dust removal tank 4, and a buffer area 42 connected to the filter bag 4 is provided at the lower end of the dust removal tank 4; a back-blowing device 43 is also provided on the filter bag 41.

[0041] like Figure 1 As shown, in one embodiment of the present invention, the blast furnace top equalized pressure release gas full recovery device also includes an electronic control system, which can be arranged in the blast furnace control room to realize centralized control and display of the full recovery device, and the operation is convenient and fast; in addition, when the full recovery device fails, it can be easily and quickly switched to the original system (i.e., by switching multiple valves) for production without affecting the normal operation of the blast furnace.

[0042] The present invention provides a blast furnace top pressure-equalizing gas full recovery device, which newly adds an ejector, ejector valve, related valves, pipelines and other supporting facilities and a control system. When the natural recovery is completed, the ejector is used to eject the small amount of low-pressure gas remaining in the material tank for forced recovery. The high-pressure working gas for ejection can be the high-pressure clean gas used for pressure equalization in the furnace top material tank. Through forced recovery by the ejector, the pressure in the material tank is reduced to a slight positive pressure in a short time, and then the upper sealing valve and the loading gate can be directly opened for loading, avoiding the secondary release of gas, thereby achieving: "full recovery" of the furnace top pressure-equalizing gas, zero emission of gas and dust; the recovery process time is ≤12s, which has no effect on the loading operation rate; the dust content of the recovered gas is as low as ≤5mg / m 3 ; Eliminate gas emission noise and extend the service life of silencer equipment; the recovery process has no impact on the clean gas pipeline network, and there is no pressure fluctuation in the pipeline network.

[0043] In the description of this specification, the description with reference to the terms "one embodiment", "example", "specific example", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0044] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments, and the above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, and these changes and improvements all fall within the scope of the present invention to be protected.

Claims

1. A blast furnace top pressure-equalizing gas recovery device, characterized in that: It comprises a material tank (1), a cyclone dust collector (2), an ejector (3) and a dust removal tank (4) which are connected in sequence, the outlet end of the dust removal tank (4) is connected to a clean gas pipeline network (5), and the outlet end of the cyclone dust collector (2) is also connected to a clean gas primary pressure equalization system (6) and a nitrogen secondary pressure equalization system (7); The outlet end of the clean coal gas primary pressure equalization system (5) is also connected to the ejector (3) through a pipeline.

2. A blast furnace top pressure-equalized gas recovery device according to claim 1, characterized in that: The outlet end of the cyclone dust collector (2) is also connected to a muffler (8) via a pipeline.

3. A blast furnace top pressure-equalizing gas recovery device according to claim 2, characterized in that: Two valves five (500) are provided on the pipeline between the cyclone dust collector (2) and the muffler (8).

4. A blast furnace top pressure-equalizing gas recovery device according to claim 1, characterized in that: The cyclone dust collector (2) and the ejector (3) are connected via a pipeline; A valve four (400) is provided on the pipeline between the cyclone dust collector (2) and the ejector (3).

5. A blast furnace top pressure-equalizing gas recovery device according to claim 1, characterized in that: One end of the material tank (1) close to the top of the material tank (1) is connected to a pipe (100), the other end of the pipe (100) is connected to the bottom of the cyclone dust collector (2), and one end of the pipe (100) close to the cyclone dust collector (2) is provided with a valve (20); One end of the pipeline 1 (100) close to the material tank (1) is connected to the pipeline 2 (200), and the other end of the pipeline 2 (200) is connected to the cyclone dust collector (2).

6. A blast furnace top pressure-equalized gas recovery device according to claim 5, characterized in that: The valve 1 (20) is a check valve.

7. A blast furnace top pressure-equalizing gas recovery device according to claim 5, characterized in that: A valve three (300) is provided on one end of the pipeline two (200) close to the cyclone dust collector (2).

8. A blast furnace top pressure-equalizing gas recovery device according to claim 1, characterized in that: An ejector valve (10) is also provided on the pipeline connecting the outlet end of the clean coal gas primary pressure equalization system (5) and the ejector (3).

9. A blast furnace top pressure-equalizing gas recovery device according to claim 1, characterized in that: A filter bag (41) is provided at the upper end of the dust removal tank (4), and a buffer area (42) connected to the filter bag (4) is provided at the lower end of the dust removal tank (4).

10. A blast furnace top pressure-equalizing gas recovery device according to claim 9, characterized in that: The filter bag (41) is also provided with a back-blowing device (43).

Images