Blast furnace gas dechlorination device

Abstract

The utility model provides a blast furnace gas dechlorinating device which comprises an alkali preparing device, a storage device is arranged on the side portion of the alkali preparing device, the alkali preparing device and the storage device are communicated through a pipeline, a conveying valve is arranged on the pipeline between the alkali preparing device and the storage device, a gas pressurizing device is arranged on the side portion of the storage device, and the gas pressurizing device and the storage device are communicated through a pipeline. A three-way valve is arranged on the pipeline between the storage device and the gas pressurizing device, a conveying pump and an alkali liquor control valve are sequentially arranged on the pipeline between the storage device and the three-way valve, and a gas adjusting valve is arranged on the pipeline between the gas pressurizing device and the three-way valve; one end of the three-way valve is communicated with the storage device, the other end of the three-way valve is communicated with the gas pressurizing device, and the rest end of the three-way valve is communicated with the spraying device. According to the utility model, the dechlorinating device is advanced into the coal gas ascending pipe for dechlorinating, so that the problems of tedious dechlorinating process and the like in the using process of the existing device and method are solved.

Description

Technical Field

[0001] The utility model belongs to the technical field of iron and steel metallurgy and relates to a chlorine removal device for blast furnace gas. Background Technique

[0002] Blast furnace gas is a by-product gas in the blast furnace smelting process. The dust content in the gas is generally above 10 g / m 3 and it must be purified and dedusted before use. The purification and dedusting of blast furnace gas are divided into two categories: wet dedusting and dry dedusting. At present, according to the relevant regulations of the national environmental protection department, it is a general trend to replace wet dedusting with dry dedusting.

[0003] Dry dedusting means that after the blast furnace gas is roughly dedusted by a gravity or cyclone dust collector, it enters dry fine dedusting and finally obtains clean gas with a low dust content by relying on a dry dedusting device. However, the gaseous pollutants in the blast furnace gas after dry dedusting, especially acidic corrosive gases such as those containing Cl - are not completely removed. In the subsequent process, the gas is cooled to form strong acid condensation and acid corrosion, which shortens the service life of the equipment, thus leading to the occurrence of acid corrosion and leakage accidents of gas equipment. Therefore, the removal of chlorine in the dry dedusting of blast furnace gas is particularly important.

[0004] After retrieval, Comparative Document 1 is a Chinese invention patent application "A Low-cost Method and Device for Desulfurizing Blast Furnace Gas" (application number: CN202210445961.8), which first cools the gas after the TRT device to remove chlorine and then heats it up for desulfurization by hydrolysis, and then cools it again and sends it out to a dry adsorption tower for purification. After being applied to the residual pressure and waste heat utilization device, the gas needs to be continuously cooled and heated, and the process is cumbersome and complex; Comparative Document 2 is a Chinese invention patent application "A Chlorine Removal and Desulfurization System and Process for Blast Furnace Gas" (application number: CN201910770009.3), which conveys the blast furnace gas to a gas chlorine removal tower for chlorine removal after passing through a gravity dust collector and a dry bag dust collector, and after chlorine removal, it enters the gas desulfurization system for desulfurization through the TRT. However, this system must regulate the pressure of the blast furnace gas after chlorine removal before entering the next process, which causes pressure loss and reduces the TRT conversion efficiency. Content of the Utility Model

[0005] The purpose of the utility model is to provide a chlorine removal device for blast furnace gas aiming at the problems existing in the prior art, and solve the problem that the gaseous pollutants in the blast furnace gas after dry dedusting, especially acidic corrosive gases such as those containing Cl - are not completely removed, and in the subsequent process, the gas is cooled to form strong acid corrosion, which shortens the service life of the equipment, thus leading to acid corrosion and leakage accidents of gas equipment.

[0006] For this reason, the utility model adopts the following technical solutions:

[0007] A blast furnace gas dechlorination device includes an alkali preparation device. A storage device is provided on the side of the alkali preparation device, and the two are connected through a pipeline. A delivery valve is provided on the pipeline between the alkali preparation device and the storage device. A gas pressurization device is provided on the side of the storage device, and the two are connected through a pipeline. A three-way valve is provided on the pipeline between the storage device and the gas pressurization device. A delivery pump and an alkali liquid control valve are successively provided on the pipeline between the storage device and the three-way valve. A gas control valve is provided on the pipeline between the gas pressurization device and the three-way valve. One end of the three-way valve is connected to the storage device, the other end is connected to the gas pressurization device, and the remaining end is connected to a spraying device.

[0008] Further, the spraying device is provided with a plurality of single-fluid nozzles, and the nozzles are made of 304 stainless steel or 316 stainless steel.

[0009] Further, the alkali preparation device contains a base solution.

[0010] Further, the spraying device is wound around the inner wall of the blast furnace gas riser pipe and winds around the inner wall for one circle.

[0011] The beneficial effects of the present utility model are as follows:

[0012] The dechlorination device of the present utility model advances the dechlorination to the gas riser pipe. When the gas passes through, the alkali liquid and the chemical components in the gas can react in advance, the reaction time is increased, and after turning and entering the subsequent pipeline, secondary mixing can be carried out, the reaction is more sufficient, and the corrosion of the subsequent pipeline is reduced, and the service life is extended; in addition, when the concentrated alkali liquid is sprayed for a long time and the nozzle is blocked by alkali liquid crystallization, an inert gas can be introduced at this time to wash the nozzle to enhance the use efficiency. The present utility model has the advantages of simple structure, convenient operation and easy layout. Description of the Drawings

[0013] Figure 1 is a schematic structural diagram of the present utility model.

[0014] In the figure, 1 - alkali preparation device, 2 - storage device, 3 - gas pressurization device, 4 - delivery valve, 5 - delivery pump, 6 - alkali liquid control valve, 7 - gas control valve, 8 - three-way valve, 9 - spraying device. Detailed Embodiments

[0015] The technical solutions of the present utility model will be described in detail below in conjunction with the drawings and the implementation methods.

[0016] As Figure 1As shown in the figure, a blast furnace gas dechlorination device includes an alkali preparation device 1. A storage device 2 is provided on the side of the alkali preparation device 1, and the two are connected by a pipeline. A delivery valve 4 is provided on the pipeline between the alkali preparation device 1 and the storage device 2. A gas pressurization device 3 is provided on the side of the storage device 2, and the two are connected by a pipeline. A three-way valve 8 is provided on the pipeline between the storage device 2 and the gas pressurization device 3. A delivery pump 5 and an alkali liquid control valve 6 are successively provided on the pipeline between the storage device 2 and the three-way valve 8. A gas control valve 7 is provided on the pipeline between the gas pressurization device 3 and the three-way valve 8. One end of the three-way valve 8 is connected to the storage device 2, the other end is connected to the gas pressurization device 3, and the remaining end is connected to a spray device 9.

[0017] Specifically, the spray device 9 is provided with a number of single-fluid nozzles, and the nozzles are made of 304 stainless steel or 316 stainless steel. The spray device 9 is wound around the inner wall of the blast furnace gas riser pipe and winds around the inner wall for one circle.

[0018] In addition, the alkali preparation device 1 contains a base solution, and the base solution contains one or two alkaline solutions of NaOH solution and KOH solution, as well as anhydrous ethanol with a volume fraction of 0.2 - 0.5%; specifically, the mass-volume concentration of the NaOH solution is 600 - 720 g / L, and the mass-volume concentration of the KOH solution is 673 - 785 g / L.

[0019] The use process of the present utility model is as follows:

[0020] The alkali preparation device 1 prepares the alkali liquid and stores it in the storage device 2. The delivery pump 5 delivers the alkali liquid to the spray device 9 evenly wound around the wall of the gas riser pipe, and the gas pressurization device 3 provides sufficient pressure and flow rate for the atomization and spraying of the alkali liquid; the original blast furnace gas makes countercurrent contact with the atomized alkali liquid in the pipeline, and the chloride ions in the gas dissolve into the atomized alkali liquid and are effectively removed; the flow rate and pressure of the alkali liquid and the introduced gas are precisely controlled by the delivery valve 4, the alkali liquid control valve 6, the gas control valve 7, and the three-way valve 8 to ensure the stable and efficient operation of the entire dechlorination process. When the gas enters the subsequent pipeline through the turning point of the riser pipe, the gas and the atomized liquid droplets can be mixed again at the turning point, and the reaction is more sufficient.

Claims

1. A blast furnace gas dechlorination device, characterized in that: The invention comprises an alkali preparation device (1), wherein a storage device (2) is provided on the side of the alkali preparation device (1), and the two are connected through a pipeline. A delivery valve (4) is provided on the pipeline between the alkali preparation device (1) and the storage device (2). A gas pressurizing device (3) is provided on the side of the storage device (2), and the two are connected through a pipeline. A three-way valve (8) is provided on the pipeline between the storage device (2) and the gas pressurizing device (3). A delivery pump (5) and an alkali liquid control valve (6) are provided on the pipeline between the storage device (2) and the three-way valve (8) in sequence. A gas regulating valve (7) is provided on the pipeline between the gas pressurizing device (3) and the three-way valve (8). One end of the three-way valve (8) is connected to the storage device (2), the other end is connected to the gas pressurizing device (3), and the remaining end is connected to a spray device (9).

2. A blast furnace gas dechlorination device according to claim 1, characterized in that: The spray device (9) is provided with a plurality of single-fluid nozzles, and the nozzles are made of stainless steel.

3. A blast furnace gas dechlorination device according to claim 1, characterized in that: The alkali preparation device (1) contains an alkali solution.

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