CN219730966U - Multistage multimode gas recovery device - Google Patents

Abstract

The utility model discloses a multistage multimode gas recovery device, which relates to the technical field of blast furnace ironmaking equipment and comprises a blast furnace charging bucket, a recovery dust remover and a gas pipe network, wherein a first recovery pipeline is communicated between the blast furnace charging bucket and the recovery dust remover, and a second recovery pipeline is communicated between the recovery dust remover and the gas pipe network; at least one of the first recovery pipeline and the second recovery pipeline is provided with an ejector device; two ends of the ejector device are provided with bypass pipelines in parallel, and the bypass pipelines are provided with shut-off valves. The utility model has the effect of improving the gas recovery efficiency of the blast furnace tank.

Description

Multistage multimode gas recovery device

Technical Field

The utility model relates to the technical field of blast furnace ironmaking equipment, in particular to a multi-stage multi-mode gas recovery device.

Background

When the blast furnace material tank discharges gas, the high-pressure gas in the blast furnace material tank is discharged through the pressure discharge pipeline, and the gas of the blast furnace material tank is directly discharged into the atmosphere after simple coarse dust removal, so that not only is the atmospheric pollution caused, but also gas resources are wasted. In recent years, with the improvement of environmental protection requirements, a gas recovery device is gradually arranged on part of blast furnace charging tanks in China and is used for partially or completely recovering the gas discharged from the blast furnace charging tanks. The partial recovery is also called semi-recovery, and about 60-80% of blast furnace gas can be recovered according to different blast furnace working conditions; the full recovery is based on half recovery, and an injection device is added, so that the discharged coal gas can completely enter a coal gas pipe network.

The main arrangement mode of the full recovery is as follows: the method is characterized in that a gas recovery pipe is led out from a gas discharge pipeline, an ejector is arranged on the gas recovery pipe, a high-pressure clean gas source pipe is led out from a high-pressure clean gas pipe, the high-pressure clean gas source pipe is communicated with the ejector and ejects the ejector, gas in the gas recovery pipe is led into a dust remover after being ejected and then is sent to a gas pipe network for recovery, and the process is simple in arrangement, but limited in ejection capacity, and is not suitable for the arrangement of most blast furnace sites, especially the engineering arrangement with complicated pipe systems and large damage resistance.

Disclosure of Invention

In order to solve the problem of low gas recovery efficiency of a blast furnace tank, the utility model provides a multi-stage multi-mode gas recovery device.

The utility model provides a multistage multimode gas recovery device, which adopts the following technical scheme:

the multi-stage multi-mode gas recovery device comprises a blast furnace charging bucket, a recovery dust remover and a gas pipe network, wherein a first recovery pipeline is communicated between the blast furnace charging bucket and the recovery dust remover, and a second recovery pipeline is communicated between the recovery dust remover and the gas pipe network;

at least one of the first recovery pipeline and the second recovery pipeline is provided with an ejector device;

and two ends of the ejector device are connected in parallel with a bypass pipeline, and a cut-off valve is arranged on the bypass pipeline.

By adopting the technical scheme, the bypass pipeline is arranged at the ejector device in parallel, so that on one hand, when the ejector fails, waste gas can circulate through the bypass pipeline without influencing the normal operation of the whole recovery device; on the other hand, the bypass pipeline is arranged, and in the process of high-pressure exhaust of the blast furnace material tank, waste gas can be discharged into the recovery dust remover or discharged out of the recovery dust remover through the bypass pipeline and the ejector at the same time, so that the recovery efficiency of the waste gas is improved.

Optionally, the ejector device comprises an ejector and a high-pressure clean gas source, and a high-pressure clean gas pipeline capable of being opened and closed is arranged between the ejector and the high-pressure clean gas source.

By adopting the technical scheme, when the high-pressure clean gas source is connected into the ejector through the high-pressure clean gas pipeline, the ejector can operate to realize supercharging of waste gas, so that negative pressure is formed in the first recovery pipeline or the second recovery pipeline, and full recovery of the waste gas in the blast furnace charging bucket is realized.

Optionally, the pipe diameter of the bypass pipeline is not smaller than the narrowest pipe diameter of the ejector.

By adopting the technical scheme, as the pipe diameter of the ejector is narrower, the pipe diameter of the bypass pipeline is larger than or equal to the pipe diameter of the ejector, the throughput of waste gas can be improved, the throughput of the waste gas in the first recovery pipeline in unit time is increased, and the recovery efficiency of the waste gas is increased.

Optionally, an injection valve for opening and closing the high-pressure clean gas pipeline is arranged on the high-pressure clean gas pipeline.

By adopting the technical scheme, the ejector valve is arranged on the high-pressure clean gas pipeline, so that the ejector can be controlled to be opened and closed, and when the blast furnace material tank is exhausted at high pressure, the ejector valve can be closed, and at the moment, the ejector is equivalent to a common pipeline for waste gas to pass through; when the blast furnace charging bucket is exhausted under low pressure, the ejector valve is opened, and the ejector starts to work at the moment, so that the waste gas can be pressurized, a negative pressure environment is formed in the first recovery pipeline or the second recovery pipeline, and the waste gas in the blast furnace charging bucket is fully recovered.

Optionally, the first recovery pipeline, the second recovery pipeline and the high-pressure clean gas pipeline are all provided with protection units, and the protection units can effectively block the first recovery pipeline, the second recovery pipeline or the high-pressure clean gas pipeline.

Through adopting above-mentioned technical scheme, when recovery unit's anywhere breaks down, can block the pipeline through the protection unit of different positions, realize the closure of pipeline to improve whole recovery unit's security.

Optionally, each protection unit comprises a blocking valve and a gas diffusing pipeline, wherein a plurality of blocking valves are respectively and correspondingly arranged on the first recovery pipeline, the second recovery pipeline and the high-pressure clean gas pipeline, and a plurality of gas diffusing pipelines are respectively and correspondingly communicated with the first recovery pipeline, the second recovery pipeline and the high-pressure clean gas pipeline.

By adopting the technical scheme, the blocking valve is arranged to seal the first recovery pipeline, the second recovery pipeline and the high-pressure clean gas pipeline, and residual gas in the pipeline can be discharged out of the recovery device through the gas diffusing pipeline.

Alternatively, the blocking valve comprises a ball valve and a blind plate valve arranged in series, and the ball valve can be replaced by a butterfly valve.

By adopting the technical scheme, according to the related specification requirements of the gas pipeline, the ball valve and the blind plate valve which are connected in series are arranged to be used as blocking valves so as to ensure effective blocking of the first recovery pipeline, the second recovery pipeline and the high-pressure clean gas pipeline; according to the pipe diameter difference, can replace the ball valve to the butterfly valve.

Optionally, a furnace top diffusing pipe is connected to the blast furnace charging bucket, and a first blind plate valve for opening and closing the furnace top diffusing pipe is arranged on the furnace top diffusing pipe.

By adopting the technical scheme, when the recovery device is in a normal operation state, the first blind plate valve is used for closing the furnace top discharge pipe, so that waste gas is recovered and treated by the recovery device; when the recovery device fails and is difficult to normally operate, the waste gas in the blast furnace charging bucket can be directly discharged out of the blast furnace charging bucket through the furnace top diffusing pipe.

Optionally, compensators are disposed on the first recovery pipeline and the second recovery pipeline.

Through adopting above-mentioned technical scheme, because exhaust waste gas has heat in the blast furnace charging bucket for first recovery pipeline and second recovery pipeline are heated and are easily expanded, set up the compensator and make the compensator can absorb first recovery pipeline and second recovery pipeline because of the expansion displacement deflection that ambient temperature, operating temperature and pressure change brought.

In summary, the present utility model includes at least one of the following beneficial effects:

1. the bypass pipeline which can be opened and closed through the shut-off valve is arranged in parallel at the ejector device, so that the operation of the recovery device is not influenced when the ejector fails, and the recovery efficiency of waste gas is improved;

2. when the ejector device and the bypass pipeline are arranged on the first recovery pipeline and the second recovery pipeline, the waste gas flux of the whole recovery device can be improved, and the recovery efficiency of waste gas is greatly improved while the full recovery of the waste gas is realized;

3. when the first recovery pipeline and the second recovery pipeline are both provided with the ejector device and the bypass pipeline, the whole recovery device has three operation modes, and a manager can select a proper operation mode according to the actual waste gas emission condition and the operation condition of the recovery device, so that the gas recovery device can adapt to different conditions;

4. if the old gas recovery device is a half recovery device, the gas recovery device is transformed into the gas recovery device, and the gas recovery device can be realized only by installing an ejector on the original pipeline and arranging a bypass pipeline in parallel on the original pipeline; if the old gas recovery device is a full recovery device, the gas recovery device is transformed into the gas recovery device of the utility model, and the gas recovery device can be realized by only arranging a bypass pipeline in parallel on the original pipeline, and has simple and convenient operation and lower manufacturing cost.

Drawings

FIG. 1 is a schematic flow chart of a gas recovery device in example 1 of the present utility model;

FIG. 2 is a schematic flow chart of a gas recovery device in example 2 of the present utility model;

FIG. 3 is a schematic flow chart of a gas recovery apparatus according to example 3 of the present utility model.

Reference numerals illustrate: 1. a blast furnace charging bucket; 11. a furnace top diffusing pipe; 12. a first blind plate valve; 2. recovering the dust remover; 3. a gas pipe network; 4. a first recovery line; 41. a protection unit; 411. a blocking valve; 412. a gas diffusing pipeline; 5. a second recovery line; 51. a compensator; 6. an ejector device; 61. an ejector; 62. a high pressure clean gas source; 63. a high pressure clean gas conduit; 631. an ejector valve; 7. a bypass line; 71. and a shut-off valve.

Detailed Description

The utility model is described in further detail below with reference to fig. 1-3.

Example 1

Referring to fig. 1, the multi-stage multi-mode gas recovery device disclosed in embodiment 1 of the present utility model comprises a blast furnace charging bucket 1, a recovery dust collector 2 and a gas pipe network 3, wherein a first recovery pipeline 4 is communicated between the blast furnace charging bucket 1 and the recovery dust collector 2, and a second recovery pipeline 5 is communicated between the recovery dust collector 2 and the gas pipe network 3. The high-pressure waste gas generated by the blast furnace material tank 1 can enter the recovery dust collector 2 through the first recovery pipeline 4, and after being recovered and purified by the recovery dust collector 2, the high-pressure waste gas enters the gas pipe network 3 through the second recovery pipeline 5.

Referring to fig. 1, an ejector device 6 is provided on the first recovery pipe 4, the ejector device 6 includes an ejector 61 and a high-pressure clean gas source 62, the ejector 61 is provided on the first recovery pipe 4, a high-pressure clean gas pipe 63 is provided between the high-pressure clean gas source 62 and the ejector 61, clean gas in the high-pressure clean gas source 62 can enter the ejector 61 through the high-pressure clean gas pipe 63, and thus normal operation of the ejector 61 is achieved.

Referring to fig. 1, the high-pressure clean gas pipe 63 is further provided with an injection valve 631 and a protection unit 41 capable of closing the high-pressure clean gas pipe 63, the protection unit 41 comprises a gas diffusing pipe 412 and a blocking valve 411, the blocking valve 411 comprises a ball valve and a blind plate valve which are sequentially arranged on the high-pressure clean gas pipe 63, the ball valve can be replaced with a butterfly valve according to actual requirements, the injection valve 631 is arranged on one side, far away from the ball valve, of the blind plate valve, two gas diffusing pipes 412 are arranged, one gas diffusing pipe 412 is located between the blind plate valve and the ball valve, and the other gas diffusing pipe 412 is located between the blind plate valve and the injection valve 631.

Referring to fig. 1, the protection unit 41 is provided to effectively cut off the high-pressure clean gas pipe 63, and when the pipeline equipment is overhauled, the ball valve and the blind plate valve are closed, so that the high-pressure clean gas source 62 can be blocked from entering the high-pressure clean gas pipe 63, and the personal safety of overhaulers is ensured. The ejector valve 631 can be used for realizing communication and blocking between the ejector 61 and the high-pressure clean gas source 62 in daily work, so as to control the opening and closing of the ejector 61.

Referring to fig. 1, the two ends of the ejector device 6 are further provided with a bypass line 7 in parallel, and a shut-off valve 71 for opening and closing the bypass line 7 is provided on the bypass line 7, and the shut-off valve 71 may be a valve such as a butterfly valve, a check valve, or a check valve. By providing the ejector device 6, the recovery efficiency of the gas can be improved, and since the waste gas discharged from the blast furnace tank 1 has a large early-stage discharge pressure and a small late-stage discharge pressure, when the latter-stage waste gas discharge pressure is small, the ejector 61 is started to form a pressure difference in the first recovery pipeline 4, so that the waste gas discharged at a low pressure can be sufficiently discharged into the recovery dust collector 2. When the waste gas is discharged at high pressure in the early stage, the ejector 61 is closed, the ejector 61 is equivalent to a common pipeline, and the bypass pipeline 7 is connected in parallel at the ejector device 6, so that the pipe diameter of the waste gas circulation pipeline can be increased, the discharge speed of the waste gas is increased, and the recovery time of the waste gas can be shortened.

Referring to fig. 1, a blast furnace charging bucket 1 is connected with a furnace top diffusion pipe 11, the furnace top diffusion pipe 11 is connected with the atmosphere, a first blind plate valve 12 for closing the furnace top diffusion pipe 11 is arranged on the furnace top diffusion pipe 11, the furnace top diffusion pipe 11 is arranged to enable a standby discharging path to exist in the blast furnace charging bucket 1, and when a gas recovery pipeline breaks down, waste gas generated by the blast furnace charging bucket 1 can be directly discharged through the furnace top diffusion pipe 11 for maintenance.

Referring to fig. 1, the first recovery pipe 4 and the second recovery pipe 5 are further provided with a compensator 51, and since the waste gas has a high temperature, when the waste gas passes through the first recovery pipe 4 and the second recovery pipe 5, the first recovery pipe 4 and the second recovery pipe 5 are thermally expanded, and the compensator 51 is provided so that the compensator 51 can absorb expansion displacement of the first recovery pipe 4 and the second recovery pipe 5 due to environmental temperature, working temperature and pressure changes, so that the first recovery pipe 4 and the second recovery pipe 5 are not easily expanded and cracked, resulting in pipe damage.

Referring to fig. 1, a protection unit 41 is disposed on the high-pressure clean gas pipeline 63, a protection unit 41 is also disposed on the first recovery pipeline 4 and the second recovery pipeline 5, two diffusing pipelines in the protection unit 41 are disposed on two sides of the blind plate valve respectively, and the protection unit 41 is disposed on the first recovery pipeline 4 and the second recovery pipeline 5, so that effective cutting of the first recovery pipeline 4 and the second recovery pipeline 5 can be realized, and the safety performance of the whole recovery device is improved.

The implementation principle of the multistage multimode gas recovery device of the embodiment 1 of the utility model is as follows: the ejector device 6 is arranged on the first recovery pipeline 4, and the bypass pipelines 7 are arranged at the two ends of the ejector device 6 in parallel, so that on one hand, when the waste gas is discharged from the blast furnace tank 1 at high pressure, the discharge efficiency of the waste gas is lower due to the fact that the pipe diameter of the ejector 61 is narrower, the bypass pipelines 7 are arranged, and when the gas is discharged at high pressure, the gas can pass through the bypass pipelines 7 and the ejector 61 at the same time, the discharge capacity of the first recovery pipeline 4 is increased, and the recovery efficiency of the waste gas is improved.

On the other hand, when the blast furnace tank 1 discharges the residual waste gas at a low pressure, the ejector valve 631 is opened to communicate the ejector 61 with the high-pressure clean gas source 62, and at this time, the ejector 61 is operated to cause negative pressure through the ejector 61, so that the waste gas in the blast furnace tank 1 can enter the recovery dust collector 2 through the first recovery pipeline 4 as completely as possible, and the full recovery of the waste gas is realized. Because the pipe diameter of the ejector 61 is narrower, residues in the waste gas easily block the ejector 61, the ejector 61 is damaged, a bypass pipeline 7 is arranged, when the ejector 61 breaks down, the waste gas can enter the recovery dust remover 2 through the bypass pipeline 7, and the influence on the operation of the whole recovery device due to the fact that the ejector device 6 breaks down is reduced. And the bypass pipeline 7 is convenient to install and improve on the existing device, so that a factory can quickly reform the existing pipeline on the premise of not changing the original pipeline, and the full recovery of waste gas is realized.

Example 2

Example 2 of the present utility model differs from example 1 in that, referring to fig. 2, an ejector device 6 and bypass lines 7 connected in parallel to both ends of the ejector device 6 are provided on the second recovery line 5. The ejector device 6 is arranged on the second recovery pipeline 5, so that on one hand, the purified gas in the recovery dust collector 2 can be fully discharged into the gas pipe network 3; on the other hand, the ejector device 6 on the second recovery pipeline 5 can generate micro negative pressure on the first recovery pipeline 4, so that the coal gas in the blast furnace material tank 1 can be more efficiently discharged into the recovery dust collector 2.

Example 3

The difference between embodiment 3 and embodiment 1 of the present utility model is that, referring to fig. 3, the first recovery pipeline 4 and the second recovery pipeline 5 are both provided with ejector devices 6, and two ends of each ejector device 6 are connected in parallel with a bypass pipeline 7, preferably, the pipe diameter of the bypass pipeline 7 is not less than the pipe diameter of the narrowest part of the ejector 61, and if the pipe diameter of the bypass pipeline 7 is less than the pipe diameter of the narrowest part of the ejector 61, the function of the device of the present utility model can still be realized. An ejector valve 631 and a protection unit 41 are provided in accordance with embodiment 1 on the high pressure clean gas pipe 63 in each ejector device 6.

The implementation principle of the multi-stage multi-mode gas recovery device in the embodiment 3 of the utility model is as follows: the first recovery pipeline 4 and the second recovery pipeline 5 are respectively provided with an ejector device 6 and a bypass pipeline 7, so that the recovery device has three operation modes.

First mode of operation: the ejector device 6 on the first recovery pipeline 4 independently operates, and in the high-pressure exhaust stage of the blast furnace tank 1, the shut-off valves 71 of the two bypass pipelines 7 are simultaneously opened, and the two ejector valves 631 are closed, so that high-pressure waste gas can pass through the ejector 61 and the bypass pipelines 7 at the same time, and the speed of the high-pressure exhaust stage is increased; and in the low-pressure exhaust stage, the cut-off valve 71 on the first recovery pipeline 4 is closed, the injection valve 631 on the first recovery pipeline 4 is opened, so that the bypass pipeline 7 is closed, and the injection valve 631 on the first recovery pipeline 4 is utilized to absorb the residual waste gas, thereby realizing the full recovery of the waste gas in the blast furnace tank 1.

Second mode of operation: the ejector 61 on the second recovery pipeline 5 operates independently, the second operation mode and the first operation mode are different from each other in the low-pressure exhaust stage, the ejector valve 631 on the first recovery pipeline 4 is closed, the ejector 61 stops operating, the shut-off valve 71 of the first recovery pipeline 4 is opened, and at the moment, the waste gas in the first recovery pipeline 4 is discharged into the recovery dust collector 2 through the ejector 61 and the bypass pipeline 7 at the same time; at the same time, the ejector valve 631 on the second recovery line 5 is opened and the shut-off valve 71 is closed, at this time the ejector 61 is operated, and negative pressure is formed in the recovery line, so that full recovery of waste gas can still be realized. In the high-pressure exhaust stage, since the waste gas in the first recovery pipeline 4 enters the recovery dust collector 2 through the bypass pipeline 7 and the injection valve 631 at the same time, the bypass pipeline 7 needs to be kept open in the second recovery pipeline 5, so that the air inflow and the air outflow of the recovery dust collector 2 can be balanced.

Third mode of operation: the ejectors 61 on the first recovery line 4 and the second recovery line 5 are operated simultaneously. In the high-pressure exhaust stage, the cut-off valves 71 of the two bypass pipelines 7 are simultaneously opened, and the two injection valves 631 are closed, so that waste gas can pass through the injector 61 and the bypass pipelines 7 at the same time, and the exhaust speed of the high-pressure exhaust stage is accelerated; in the low-pressure exhaust stage, the ejectors 61 on the first recovery pipeline 4 and the second recovery pipeline 5 start to operate sequentially or simultaneously, the bypass pipeline 7 of the first recovery pipeline 4 and the second recovery pipeline 5 is closed, the ejection capacity of the recovery device is maximized, the circulation speed of waste gas can be increased, and compared with the first operation mode and the second operation mode, the recovery efficiency of the waste gas is further improved.

The above embodiments are not intended to limit the scope of the present utility model, so: all equivalent changes in structure, shape and principle of the utility model should be covered in the scope of protection of the utility model.

Claims (9)

1. A multi-stage multi-mode gas recovery device is characterized in that: the device comprises a blast furnace charge tank (1), a recovery dust remover (2) and a gas pipe network (3), wherein a first recovery pipeline (4) is communicated between the blast furnace charge tank (1) and the recovery dust remover (2), and a second recovery pipeline (5) is communicated between the recovery dust remover (2) and the gas pipe network (3);

at least one of the first recovery pipeline (4) and the second recovery pipeline (5) is provided with an ejector device (6);

two ends of the ejector device (6) are connected in parallel with a bypass pipeline (7), and a cut-off valve (71) is arranged on the bypass pipeline (7).

2. The multi-stage, multi-mode gas recovery device of claim 1, wherein: the ejector device (6) comprises an ejector (61) and a high-pressure clean gas source (62), and a high-pressure clean gas pipeline (63) capable of being opened and closed is arranged between the ejector (61) and the high-pressure clean gas source (62).

3. The multi-stage, multi-mode gas recovery device of claim 2, wherein: the pipe diameter of the bypass pipeline (7) is not smaller than the narrowest pipe diameter of the ejector (61).

4. The multi-stage, multi-mode gas recovery device of claim 2, wherein: an injection valve (631) for opening and closing the high-pressure clean gas pipeline (63) is arranged on the high-pressure clean gas pipeline (63).

5. The multi-stage, multi-mode gas recovery device of claim 2, wherein: the protection unit (41) is arranged on the first recovery pipeline (4), the second recovery pipeline (5) and the high-pressure clean gas pipeline (63), and the protection unit (41) can effectively block the first recovery pipeline (4), the second recovery pipeline (5) or the high-pressure clean gas pipeline (63).

6. The multi-stage, multi-mode gas recovery device of claim 5, wherein: each protection unit (41) comprises a blocking valve (411) and a gas diffusing pipeline (412), a plurality of blocking valves (411) are respectively and correspondingly arranged on the first recovery pipeline (4), the second recovery pipeline (5) and the high-pressure clean gas pipeline (63), and the gas diffusing pipelines (412) are respectively and correspondingly communicated with the first recovery pipeline (4), the second recovery pipeline (5) and the high-pressure clean gas pipeline (63).

7. The multi-stage, multi-mode gas recovery device of claim 6, wherein: the blocking valve (411) comprises a ball valve and a blind plate valve which are arranged in series, and the ball valve can be replaced by a butterfly valve.

8. The multi-stage, multi-mode gas recovery device of claim 1, wherein: the blast furnace material tank (1) is communicated with a furnace top diffusing pipe (11), and a first blind plate valve (12) for opening and closing the furnace top diffusing pipe (11) is arranged on the furnace top diffusing pipe (11).

9. The multi-stage, multi-mode gas recovery device of claim 1, wherein: and compensators (51) are arranged on the first recovery pipeline (4) and the second recovery pipeline (5).