Blast furnace pressure-equalizing coal gas total recovery device

Abstract

The utility model discloses a blast furnace pressure-equalizing gas full-recovery device which comprises a blast furnace side, a recovery pipeline and a vacuum system. And the blast furnace side comprises a charging bucket which needs to be subjected to pressure-equalizing coal gas recovery. One end of the recovery pipeline is connected with a blast furnace side pipeline, and the other end of the recovery pipeline is connected with an external low-pressure gas pipe network pipeline. The vacuum system is connected to the recovery pipeline through a pipeline and comprises a vacuum tank and a vacuum pump which are mutually connected through a pipeline, the vacuum tank is configured to suck the coal gas in the material tank, and the vacuum pump is configured to send the coal gas in the vacuum tank to an external low-pressure coal gas pipe network. According to the blast furnace pressure-equalizing coal gas full-recovery device, when the pressure of pressure-equalizing coal gas in the charging bucket is lower than 80 kPa, the pressure-equalizing coal gas in the charging bucket is fully recovered through mutual matching of the vacuum tank and the vacuum pump, and the blast furnace pressure-equalizing coal gas full-recovery device has the advantages of structural design, flexible operation, high applicability and the like.

Description

Technical Field

[0001] The utility model belongs to the field of gas recovery, and particularly relates to a device for fully recovering the equalizing gas of a blast furnace. Background Art

[0002] In the current mainstream bell-less blast furnace ironmaking production, raw materials such as coke and sinter are charged into the furnace through the top bunker of the blast furnace for smelting. A valve is provided above the bunker to isolate it from the external air; a valve is provided below to isolate it from the blast furnace hearth. After one charging is completed, the gas in the hearth will fill the bunker; before the next charging, the gas in the bunker needs to be discharged; this not only pollutes the environment but also wastes energy. Therefore, recovering the equalizing gas of the blast furnace can achieve the purpose of energy conservation and environmental protection.

[0003] The traditional recovery method is to add a new valve and pipeline on the gas discharge pipe of the bunker, and recover the equalizing gas into the low-pressure gas pipeline network; before charging, close the original discharge valve and open the recovery valve, and rely on the self-pressure of the equalizing gas in the bunker (about 200 kPa) for natural recovery. Since the recovered equalizing gas contains solid particles, a dust collector needs to be set up for purification before it can be sent back to the gas pipeline network. In this method, when the gas pressure in the bunker is lower than 100 kPa, the recovery process gradually terminates, and there is still some gas in the bunker that cannot be recovered. Summary of the Utility Model

[0004] The technical purpose of the utility model is to provide a device for fully recovering the equalizing gas of a blast furnace to solve the problem that the gas in the bunker cannot be fully recovered.

[0005] To solve the above problems, the technical solution of the utility model is as follows:

[0006] A device for fully recovering the equalizing gas of a blast furnace, comprising:

[0007] The blast furnace side, a recovery pipeline and a vacuum system;

[0008] The blast furnace side includes a bunker that needs to recover the equalizing gas;

[0009] One end of the recovery pipeline is connected to the pipeline on the blast furnace side, and the other end of the recovery pipeline is connected to the pipeline of the external low-pressure gas pipeline network;

[0010] The vacuum system pipeline is connected to the recovery pipeline, and includes a vacuum tank and a vacuum pump that are connected to each other by pipelines. The vacuum tank is configured to suck the gas in the bunker into it, and the vacuum pump is configured to send the gas in the vacuum tank to the external low-pressure gas pipeline network.

[0011] Among them, the blast furnace side includes a blast furnace pipeline and a cyclone dust collector;

[0012] Both ends of the blast furnace pipeline are respectively connected to the storage bin and the recovery pipeline. A cyclone dust collector is arranged on the recovery pipeline and is configured to perform dust removal treatment on the gas to be sent into the recovery pipeline.

[0013] Further preferably, a relief valve is also arranged on the blast furnace pipeline and is configured to provide a safety warning for the blast furnace pipeline.

[0014] Among them, a recovery valve, a natural recovery valve and a dust collector are arranged on the recovery pipeline;

[0015] One end of the recovery valve is connected to the cyclone dust collector pipeline, the other end of the recovery valve is connected to one end of the natural recovery valve pipeline, the other end of the natural recovery valve is connected to one end of the dust collector pipeline, and the other end of the dust collector is connected to the external low-pressure gas pipeline network pipeline. The dust collector is configured to perform dust removal on the gas to be sent into the external low-pressure gas pipeline network.

[0016] Further preferably, the vacuum system further includes a vacuum pipeline;

[0017] The input end of the vacuum pipeline is connected to the recovery pipeline between the recovery valve and the natural recovery valve, and the output end of the vacuum pipeline is connected to the recovery pipeline between the natural recovery valve and the dust collector.

[0018] Among them, a vacuum inlet valve and a vacuum outlet valve are arranged on the vacuum pipeline;

[0019] One end of the vacuum inlet valve is the input end of the vacuum pipeline, the other end of the vacuum inlet valve is connected to the input end of the vacuum tank pipeline, the output end of the vacuum tank is connected to the input end of the vacuum pump pipeline, the output end of the vacuum pump is connected to one end of the vacuum outlet valve pipeline, and the other end of the vacuum outlet valve is the output end of the vacuum pipeline.

[0020] Due to the adoption of the above technical solutions, the present utility model has the following advantages and positive effects compared with the prior art:

[0021] The present utility model provides a blast furnace equalizing gas full recovery device. When the pressure of the equalizing gas in the storage bin is lower than 80 kPa, through the mutual cooperation between the provided vacuum tank and the vacuum pump, the full recovery of the equalizing gas in the storage bin is realized, and it has the advantages of structured design, flexible operation, strong applicability, etc. Description of the Drawings

[0022] By reading the following detailed description of the preferred embodiments, various other advantages and benefits will become clear to those of ordinary skill in the art. The drawings are only for the purpose of showing the preferred embodiments and are not considered to be a limitation of the present utility model.

[0023] Figure 1 It is a structural block diagram of a blast furnace equalizing gas full recovery device of the present utility model. Detailed Embodiments

[0024] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will describe the specific embodiments of the present invention with reference to the accompanying drawings. Obviously, the accompanying drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings, and other embodiments can also be obtained.

[0025] To simplify the drawings, only the parts related to the present invention are schematically shown in each figure, and they do not represent the actual structure of the product. In addition, to simplify the drawings and facilitate understanding, in some figures, for components with the same structure or function, only one of them is schematically shown, or only one of them is labeled. In this article, "one" not only means "only this one", but also can mean "more than one" situation.

[0026] The following further details a blast furnace equalizing gas full recovery device proposed by the present invention in conjunction with the accompanying drawings and specific embodiments. According to the following description and the claims, the advantages and features of the present invention will be clearer.

[0027] Embodiment

[0028] Refer to Figure 1 , this embodiment provides a blast furnace equalizing gas full recovery device, which can be roughly divided into the blast furnace side, the recovery pipeline and the vacuum system.

[0029] First is the blast furnace side located on the Figure 1 left side, which includes a storage tank that needs to recover equalizing gas, as well as a blast furnace pipeline and a cyclone dust collector. The bottom of the storage tank is connected to the top of the blast furnace body, and the top of the storage tank is the receiving port. One end of the blast furnace pipeline communicates with the inside of the storage tank, and gas will enter the blast furnace pipeline from the storage tank. After the gas leaves the storage tank, it will first enter the cyclone dust collector, and the cyclone dust collector will perform dust removal treatment on the gas to be sent to the recovery pipeline. After passing through the cyclone dust collector, the blast furnace pipeline will be divided into two branches. The first branch is connected to the recovery pipeline, and the second branch is provided with a relief valve for providing safety warning for the blast furnace pipeline. Since the relief valve is in a closed state during the gas recovery process, the gas is all transported to the recovery pipeline.

[0030] As discussed above, one end of the recovery pipeline is connected to the blast furnace side pipeline, and the other end is connected to the external low-pressure gas pipeline network. Specifically, a recovery valve, a natural recovery valve, and a dust collector are provided on the recovery pipeline. One end of the recovery valve is connected to the cyclone dust collector pipeline, the other end of the recovery valve is connected to one end of the natural recovery valve pipeline, the other end of the natural recovery valve is connected to one end of the dust collector, and the other end of the dust collector is connected to the external low-pressure gas pipeline network. The dust collector is used to remove dust from the gas to be sent to the external low-pressure gas pipeline network. In the natural recovery state, both the recovery valve and the natural recovery valve are in the open state. At this time, the pressure of the equalizing gas in the storage tank is greater than the pressure in the low-pressure gas pipeline. Therefore, the gas will flow into the low-pressure gas pipeline network after passing through the recovery valve, the natural recovery valve, and the dust collector in sequence, realizing partial gas recovery.

[0031] See Figure 1 , the vacuum system includes a vacuum pipeline, as well as a vacuum inlet valve, a vacuum tank, a vacuum pump, and a vacuum outlet valve provided on the vacuum pipeline. The input end of the vacuum pipeline is connected to the recovery pipeline between the recovery valve and the natural recovery valve, and the output end of the vacuum pipeline is connected to the recovery pipeline between the natural recovery valve and the dust collector. One end of the vacuum inlet valve is the input end of the vacuum pipeline, the other end of the vacuum inlet valve is connected to the input end of the vacuum tank pipeline, the output end of the vacuum tank is connected to the input end of the vacuum pump pipeline, the output end of the vacuum pump is connected to one end of the vacuum outlet valve pipeline, and the other end of the vacuum outlet valve is the output end of the vacuum pipeline. Since the pressure in the vacuum tank is much lower than the pressure of the equalizing gas in the storage tank, the gas in the storage tank can be sucked into it, and then the gas in the vacuum tank is pressed into the low-pressure gas pipeline network by the vacuum pump.

[0032] Now, a simple description of the specific use process of this embodiment is as follows:

[0033] The first step is the same as the traditional natural recovery method. The blow-off valve in the blast furnace side is closed for a long time. Before each charging, the recovery valve and the natural recovery valve are opened. The equalizing gas in the storage tank flows into the low-pressure gas pipeline network through the recovery pipeline and the dust collector by its own pressure, realizing partial recovery.

[0034] In the second step, when the pressure of the equalizing gas in the storage tank drops below 80 kPa, the vacuum system is put into operation, that is, the natural recovery valve is closed, the vacuum inlet valve is opened, and the residual equalizing gas in the storage tank is attracted into the vacuum tank by the pressure difference between the storage tank and the vacuum tank. When the pressure of the equalizing gas in the storage tank is lower than 5 kPa, the gas recovery in the storage tank is completed. The vacuum inlet valve and the recovery valve are closed in sequence, and the storage tank is ready for the next batch of charging. Then, the vacuum outlet valve is opened, and the equalizing gas in the vacuum tank is sent to the low-pressure gas pipeline network through the dust collector by the vacuum pump, and the vacuum degree in the vacuum tank is restored, completing a full recovery process. It is worth mentioning that the outlet pressure of the vacuum pump is greater than the pressure of the low-pressure gas pipeline network to prevent gas backflow.

[0035] The embodiments of the present utility model have been described in detail above in conjunction with the accompanying drawings. However, the present utility model is not limited to the above embodiments. Even if various changes are made to the present utility model, provided that these changes fall within the scope of the claims of the present utility model and its equivalent technologies, they still fall within the protection scope of the present utility model.

Claims

1. A blast furnace pressure-equalized gas full recovery device, characterized in that: include: Blast furnace side, recovery piping and vacuum system; The blast furnace side includes a material tank that needs to recover the pressure-equalized coal gas; One end of the recovery pipeline is connected to the blast furnace side pipeline, and the other end of the recovery pipeline is connected to an external low-pressure gas pipeline network pipeline; The vacuum system pipeline is connected to the recovery pipeline, and includes a vacuum tank and a vacuum pump connected to each other by pipelines. The vacuum tank is configured to suck the gas in the material tank into it, and the vacuum pump is configured to send the gas in the vacuum tank to an external low-pressure gas pipeline network.

2. The blast furnace pressure-equalized gas full recovery device according to claim 1, characterized in that: The blast furnace side includes blast furnace pipelines and cyclone dust collectors; The two ends of the blast furnace pipeline are respectively connected to the material tank and the recovery pipeline. The cyclone dust collector is arranged on the pipeline of the recovery pipeline and is configured to perform dust removal on the coal gas to be sent into the recovery pipeline.

3. The blast furnace pressure-equalized gas full recovery device according to claim 2, characterized in that: The blast furnace pipeline is also provided with a relief valve, which is configured to provide a safety warning for the blast furnace pipeline.

4. The blast furnace pressure-equalized gas full recovery device according to claim 2, characterized in that: The recovery pipeline is provided with a recovery valve, a natural recovery valve and a dust collector; One end of the recovery valve is connected to the cyclone dust collector pipeline, the other end of the recovery valve is connected to one end of the natural recovery valve pipeline, the other end of the natural recovery valve is connected to one end of the dust collector pipeline, the other end of the dust collector is connected to an external low-pressure gas pipeline network pipeline, and the dust collector is configured to remove dust from the gas to be sent into the external low-pressure gas pipeline network.

5. The blast furnace pressure-equalized gas full recovery device according to claim 4, characterized in that: The vacuum system also includes a vacuum pipeline; The input end of the vacuum pipeline is connected to the recovery pipeline between the recovery valve and the natural recovery valve, and the output end of the vacuum pipeline is connected to the recovery pipeline between the natural recovery valve and the dust collector.

6. The blast furnace pressure-equalized gas full recovery device according to claim 5, characterized in that: The vacuum pipeline is provided with a vacuum inlet valve and a vacuum outlet valve; One end of the vacuum inlet valve is the input end of the vacuum pipeline, the other end of the vacuum inlet valve is connected to the input end pipeline of the vacuum tank, the output end of the vacuum tank is connected to the input end pipeline of the vacuum pump, the output end of the vacuum pump is connected to one end pipeline of the vacuum outlet valve, and the other end of the vacuum outlet valve is the output end of the vacuum pipeline.

Images