Coal gas dust removal device

Abstract

The utility model discloses a coal gas dedusting device which comprises a coal gas pipeline, a steam pipeline, a connecting pipeline, a dust collecting pipe and a precipitation assembly, the coal gas pipeline is used for circulating coal gas, the steam pipeline is used for circulating steam, and the connecting pipeline is arranged between the coal gas pipeline and the steam pipeline and used for communicating the coal gas pipeline and the steam pipeline. The dust collecting pipe is communicated with the steam pipeline and located below the steam pipeline, and the precipitation assembly is arranged below the dust collecting pipe and used for collecting dust. According to the utility model, steam in the steam pipeline enters the gas pipeline through the connecting pipeline, the steam can be mixed with blast furnace gas, so that dust and the steam are bonded into a cluster, the clustered dust can fall into the dust collecting pipe below the steam pipeline to be collected in a centralized manner, and the collected dust can finally enter the precipitation component to be subjected to precipitation treatment; blast furnace gas dust discharged from the gas pipeline is cleaner, equipment damage can be avoided in subsequent use, and meanwhile discharged gas is more environmentally friendly.

Description

Technical Field

[0001] This utility model relates to the field of dust removal equipment technology, and in particular to a gas dust removal device. Background Technology

[0002] Blast furnace gas is a combustible gas produced as a byproduct of blast furnace ironmaking. Its approximate composition includes 6-22% carbon dioxide, 21-26% carbon monoxide, 1-4% hydrogen, 53-57% nitrogen, 0.2-0.5% hydrocarbons, and a small amount of sulfur dioxide. Its dust concentration is 10-50 g / m³ (standard conditions), with an average dust production of 50 kg / t (pig iron) - 75 kg / t (pig iron). The dust particle size is below 500 μm, and it mainly consists of iron, ferrous oxide, alumina, silicon oxide, magnesium oxide, and coke powder.

[0003] Blast furnace gas contains a large amount of dust. Direct use of dust-containing gas will affect the normal operation of equipment and cause environmental pollution. Therefore, in order to protect equipment and the environment and meet modern environmental protection requirements, blast furnace gas generally needs to undergo dust removal treatment to remove dust and meet emission standards. There are various types of dust removal equipment for blast furnace gas, including electrostatic precipitators, Venturi scrubbers, gravity dust collectors, cyclone dust collectors, and bag filters. Among them, bag filters pass blast furnace gas through a bag filter, and the dust in the blast furnace gas is filtered through the filter bags to achieve the purpose of dust removal. However, in practical applications, bag filters cannot completely remove dust during the dust removal process. The discharged blast furnace gas still contains fine dust. Therefore, long-term use of dust-containing blast furnace gas will also affect the normal operation of equipment, and the emitted gas will also contain dust, causing environmental pollution. Utility Model Content

[0004] The purpose of this utility model is to provide a gas dust removal device in order to address the shortcomings of the prior art.

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

[0006] A gas dust removal device includes a gas pipeline for the circulation of gas;

[0007] Steam pipes are used for the circulation of steam.

[0008] A connecting pipe, installed between a gas pipeline and a steam pipeline, for connecting the gas pipeline and the steam pipeline;

[0009] The ash collection pipe is connected to the gas pipeline and is located below the gas pipeline;

[0010] The sedimentation unit, located below the dust collection pipe, is used to collect dust.

[0011] Preferably, the connecting pipe is located above the gas pipeline, and the outlet direction of the connecting pipe is perpendicular to the flow direction of the gas pipeline.

[0012] Preferably, a fan is rotatably installed inside the connecting pipe to expand the airflow area.

[0013] Preferably, the inner wall of the gas pipeline is fixedly provided with a plurality of heating rods along the circumferential direction for heating the gas.

[0014] Preferably, a first valve for controlling the opening and closing of the ash collection pipe is provided at the bottom of the ash collection pipe.

[0015] Preferably, the sedimentation assembly includes a primary sedimentation tank and an overflow tank. The opening end of the primary sedimentation tank is located below the ash collection pipe. The primary sedimentation tank is also connected to a water injection pipe. The primary sedimentation tank and the overflow tank are connected by a connecting pipe. An overflow pipe is connected to the overflow tank.

[0016] Preferably, a secondary sedimentation tank is provided on one side of the primary sedimentation tank, the primary sedimentation tank and the secondary sedimentation tank are connected, and a sewage outlet is provided on the secondary sedimentation tank.

[0017] Preferably, a sewage pipe is connected to the upper part of the primary sedimentation tank, and the output end of the sewage pipe is located above the secondary sedimentation tank. A second valve is provided on the sewage pipe to control the opening and closing of the sewage pipe.

[0018] The beneficial effects of adopting the above technical solution are as follows:

[0019] In this invention, blast furnace gas enters the gas pipeline after being treated by a bag filter. High-pressure steam is introduced into the steam pipeline and enters the gas pipeline through a connecting pipe, allowing the steam and blast furnace gas to mix thoroughly. During mixing, the fine dust contained in the blast furnace gas combines with the water vapor in the steam, which can bind the dust together, increasing the weight of the dust. This causes the dust to fall into the ash collection pipe below the steam pipeline for centralized collection. After collection, the dust is settled by a sedimentation component, resulting in blast furnace gas with a lower dust content and cleaner output from the gas pipeline. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the structure of this utility model;

[0021] Figure 2 This is a three-dimensional schematic diagram of the connecting pipe of this utility model.

[0022] In the diagram: 1 is a gas pipeline, 2 is a steam pipeline, 3 is a connecting pipeline, 4 is an ash collection pipe, 5 is a fan, 6 is a heating rod, 7 is the first valve, 8 is a primary sedimentation tank, 9 is an overflow tank, 10 is a water injection pipe, 11 is a connecting pipe, 12 is an overflow pipe, 13 is a secondary sedimentation tank, 14 is a sewage outlet, 15 is the second valve, and 16 is a sewage pipe. Detailed Implementation

[0023] The embodiments of this utility model will be described in further detail below with reference to the accompanying drawings and examples. The following examples are for illustrative purposes only and should not be construed as limiting the scope of this utility model.

[0024] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0025] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0026] like Figure 1As shown, a gas dust removal device is used at the rear end of a bag filter. After filtration and dust removal by the bag filter, blast furnace gas is introduced into this device. The device includes a gas pipeline 1, a steam pipeline 2, a connecting pipeline 3, an ash collection pipe 4, and a sedimentation assembly. The gas pipeline 1 is used for the flow of gas. The inlet end of the gas pipeline 1 is connected to the output end of the bag filter. The blast furnace gas filtered by the bag filter enters the gas pipeline 1 and is transported in the gas pipeline 1. One end of the steam pipeline 2 is connected to a steam generator, and the steam generated by the steam generator can flow along the steam pipeline 2. The two ends of the connecting pipeline 3 are connected to the gas pipeline 1 and the steam pipeline 2, respectively. Multiple connecting pipelines 3 are arranged in parallel. The pressure in the steam pipeline 2 is greater than the pressure in the gas pipeline 1, so the steam in the steam pipeline 2 can enter the gas pipeline 1 through the connecting pipeline 3. The ash collection pipe 4 is located below the gas pipeline 1 and connected to the gas pipeline 1. The sedimentation assembly is located below the outlet end of the ash collection pipe 4 and is used to receive the dust falling from the ash collection pipe 4.

[0027] In this invention, steam mixes with blast furnace gas after entering the gas pipeline 1. The water vapor in the steam can combine with the dust in the blast furnace gas, causing the dust to stick together. When a large amount of dust sticks together, the weight of the dust increases, and under the influence of gravity, the dust falls to the bottom of the gas pipeline 1. The bottom of the gas pipeline 1 has a through hole, and the gas pipeline 1 and the ash collection pipe 4 are connected through the through hole. The dust that falls to the bottom of the gas pipeline 1 falls through the through hole to the ash collection pipe 4 for centralized collection. After collection, it can enter the sedimentation component below the ash collection pipe 4 for sedimentation treatment. The blast furnace gas discharged from the gas pipeline 1 is cleaner after dust removal, which plays a role in protecting the environment. In addition, after the steam is injected into the gas pipeline 1, it can also clean the inner wall of the gas pipeline 1, removing oil stains and dust and other impurities adhering to the inner wall of the gas pipeline 1.

[0028] Furthermore, the connecting pipe 3 is located above the gas pipe 1, and the outlet direction of the connecting pipe 3 is perpendicular to the flow direction of the gas pipe 1. Therefore, the direction of the steam flow from the connecting pipe 3 is perpendicular to the flow direction of the blast furnace gas, which can improve the mixing effect of steam and gas and thus improve the dust removal effect.

[0029] Furthermore, such as Figure 2 As shown, a fan 5 is rotatably installed inside the connecting pipe 3. Specifically, a cross-shaped fixing frame is fixedly installed inside the outlet end of the connecting pipe 3. The fan 5 is rotatably installed in the middle of the cross-shaped fixing frame. When the steam flows in the connecting pipe 3, it can drive the fan 5 to rotate. The rotation of the fan 5 can expand the airflow area entering the gas pipe 1, thereby enhancing the mixing effect between steam and blast furnace gas.

[0030] In another embodiment, a nozzle can be provided at the outlet end of the connecting pipe 3. The nozzle is located inside the gas pipe 1. The steam flow output from the steam pipe 2 can be dispersed into multiple streams after passing through the nozzle. When the multiple streams are mixed with the blast furnace gas, they can be mixed more evenly, so that the dust in the blast furnace gas can be more evenly combined with the steam and agglomerated.

[0031] Furthermore, multiple heating rods 6 are fixedly installed on the inner wall of the gas pipeline 1 along the circumferential direction. The heating rods 6 are electric heating rods used to heat the blast furnace gas and increase the temperature of the gas.

[0032] Furthermore, such as Figure 1 As shown, the bottom of the ash collection pipe 4 is provided with a first valve 7 for controlling the opening and closing of the ash collection pipe 4. When the first valve 7 is closed, the dust in the gas pipeline 1 clumps together and falls into the ash collection pipe 4 for centralized collection. When a certain amount is collected, the first valve 7 is opened, and the dust can fall from the ash collection pipe 4 to the sedimentation component below for sedimentation treatment.

[0033] Furthermore, such as Figure 1 As shown, the sedimentation assembly includes a primary sedimentation tank 8 and an overflow tank 9. The upper end of the primary sedimentation tank 8 is open, located below the ash collection pipe 4. The primary sedimentation tank 8 is also connected to a water injection pipe 10, which is used to inject clean water into the primary sedimentation tank 8. The primary sedimentation tank 8 and the overflow tank 9 are connected by a connecting pipe 11, which is connected to the bottom of the overflow tank 9. An overflow pipe 12 is connected to the overflow tank 9, located at the upper part of the overflow tank 9. In this embodiment, after the first valve 7 on the ash collection pipe 4 is opened, dust falls from the ash collection pipe 4 into the primary sedimentation tank 8. At the same time, the water injection pipe 10 injects clean water into the primary sedimentation tank 8, allowing the dust to settle in the primary sedimentation tank 8. The clean water above can enter the overflow tank 9 through the connecting pipe 11 and flow out from the overflow pipe 12 connected to the overflow tank 9. The impurities settled at the bottom of the primary sedimentation tank 8 can be cleaned periodically.

[0034] Furthermore, a secondary sedimentation tank 13 is provided on one side of the primary sedimentation tank 8. The primary sedimentation tank 8 and the secondary sedimentation tank 13 are connected by a sewage pipe 16. The input end of the sewage pipe 16 is located above the primary sedimentation tank 8, and the output end of the sewage pipe 16 is located above the secondary sedimentation tank 13. A second valve 15 is provided on the sewage pipe 16 for opening and closing the sewage pipe 16. In this embodiment, when the sewage treated by the primary sedimentation tank 8 still contains impurities, the second valve 15 can be opened, and the clear water containing impurities in the upper part of the primary sedimentation tank 8 can flow through the sewage pipe 16 to the secondary sedimentation tank 13 for further sedimentation treatment. When the sewage treated by the primary sedimentation tank 8 does not contain impurities, the second valve 15 can be closed, and the clear water in the upper part of the primary sedimentation tank 8 can enter the overflow tank 9 through the connecting pipe 11, and finally flow out through the overflow pipe 12 for recycling.

[0035] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and not to limit it; although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model.

Claims

1. A gas dust removal device, characterized in that, Includes a gas pipeline (1) for the circulation of gas; Steam pipe (2), used for the flow of steam; A connecting pipe (3) is installed between the gas pipe (1) and the steam pipe (2) for connecting the gas pipe (1) and the steam pipe (2); Ash collection pipe (4) is connected to the gas pipeline (1) and is located below the gas pipeline (1); A sedimentation component is located below the dust collection pipe (4) and is used to collect dust.

2. The gas dust removal device according to claim 1, characterized in that, The connecting pipe (3) is located above the gas pipe (1), and the outlet direction of the connecting pipe (3) is perpendicular to the flow direction of the gas pipe (1).

3. The gas dust removal device according to claim 2, characterized in that, A fan (5) is rotatably installed inside the connecting pipe (3) to expand the airflow area.

4. A gas dust removal device according to claim 1, characterized in that, The inner wall of the gas pipeline (1) is fixedly provided with multiple heating rods (6) along the circumferential direction for heating the gas.

5. A gas dust removal device according to claim 1, characterized in that, The bottom of the ash collection pipe (4) is provided with a first valve (7) for controlling the opening and closing of the ash collection pipe (4).

6. A gas dust removal device according to claim 1, characterized in that, The sedimentation assembly includes a primary sedimentation tank (8) and an overflow tank (9). The opening end of the primary sedimentation tank (8) is located below the ash collection pipe (4). The primary sedimentation tank (8) is also connected to a water injection pipe (10). The primary sedimentation tank (8) and the overflow tank (9) are connected by a connecting pipe (11). An overflow pipe (12) is connected to the overflow tank (9).

7. A gas dust removal device according to claim 6, characterized in that, A secondary sedimentation tank (13) is provided on one side of the primary sedimentation tank (8). The primary sedimentation tank (8) and the secondary sedimentation tank (13) are connected. A sewage outlet (14) is provided on the secondary sedimentation tank (13).

8. A gas dust removal device according to claim 7, characterized in that, The upper part of the primary sedimentation tank (8) is connected to a sewage pipe (16), and the output end of the sewage pipe (16) is located above the secondary sedimentation tank (13). A second valve (15) is provided on the sewage pipe (16) to control the opening and closing of the sewage pipe (16).

Images