Dry dechlorination system for blast furnace gas
By using a dry desulfurization system with powder dechlorination agent and spiral ladder structure in the blast furnace gas dechlorination system, the problems of HCl corrosion and desulfurization agent powdering are solved, and efficient gas dechlorination and fine desulfurization effects are achieved.
Patent Information
- Application Number
- CN202421148669.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-05-23
- Publication Date
- 2025-03-04
- Estimated Expiration
- 2034-05-23
AI Technical Summary
In the existing blast furnace gas front-end desulfurization process, the corrosiveness of HCl leads to a reduced catalyst activity and short service life, increasing operating costs and safety risks. At the same time, the powdering and blockage of the dechlorination agent also leads to poor desulfurization accuracy and equipment pressure loss.
The dry dechlorination system is adopted with a powder dechlorination agent and a spiral ladder structure. The powder dechlorination agent is atomized through the powder supply and transportation device and the dechlorination gas is fully in contact with the coal gas. The dechlorination plate is used to separate the dechlorination gas and powder to improve the dechlorination efficiency and accuracy.
It significantly improves the contact area and reaction time between the dechlorination agent and the gas, improves the dechlorination effect of the gas, reduces operating costs and equipment pressure losses, and effectively separates the dechlorinated gas and powder.
Smart Images
Figure CN222550574U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field of blast furnace gas emission, and in particular relates to a blast furnace gas dry dechlorination system. Background Art
[0002] At present, the industry requires that the SO2 concentration in flue gas should not exceed 35mg / Nm 3 Blast furnace gas is the largest combustible gas in the steel industry, with a statistical output of 70-80 billion cubic meters. 3 / month. Blast furnace gas purification and utilization mainly involves dust removal, power generation through TRT devices, and then delivery to hot blast furnaces, steel rolling heating furnaces, gas power generation and other user units for use as fuel. The SO2 content in flue gas after combustion is as high as 40-150mg / Nm 3 , which will cause serious environmental pollution. Therefore, it is necessary to desulfurize the flue gas after combustion, that is, back-end desulfurization. Compared with back-end desulfurization, front-end desulfurization refers to desulfurization before blast furnace gas combustion, which has many advantages such as small gas volume, centralized processing points, small investment, and small equipment corrosion. Therefore, front-end desulfurization has considerable advantages.
[0003] At present, the mainstream process for front-end desulfurization of blast furnace gas is "COS catalytic hydrolysis + H2S adsorption". Among them, COS hydrolysis catalysis is the core of desulfurization technology, and the COS hydrolysis catalytic reaction needs to be carried out at the alkaline center on the catalyst surface. However, blast furnace gas contains a small amount of HCl, which is highly acidic and corrosive. HCl will directly destroy the alkaline center of the hydrolysis catalyst, causing the catalytic activity and service life of the hydrolysis agent to be greatly reduced, significantly increasing the operating cost of front-end desulfurization. In addition, HCl severely corrodes subsequent equipment and gas pipelines, often causing safety accidents such as gas leaks, and increasing the cost of pipeline maintenance and replacement. Therefore, the removal of HCl from blast furnace gas is of great significance.
[0004] At present, there are corresponding technologies and methods for removing HCl from the front end of blast furnace gas. The removal methods can be divided into two categories: wet method and dry method. The wet method mainly absorbs HCl in the gas by spraying NaOH alkali solution or dechlorination liquid. The dry method is basically a fixed bed reactor. When the gas passes through the dechlorinating agent, the HCl in the gas reacts with the dechlorinating agent to achieve the dechlorination effect. However, the current dechlorination method has the following problems: (1) The reaction contact surface is small, the dechlorination efficiency is low, and the desulfurization accuracy is poor: In order to meet the requirements of the fixed bed process, the dechlorinating agent must have a certain lateral compressive strength and porosity, which requires that the diameter of the dechlorinating agent is usually greater than 4mm. Conventional calcium-based dechlorinating agents are usually strip-shaped, and aluminum-based dechlorinating agents are spherical. Therefore, the HCl in the gas can only react with the surface of the dechlorinating agent, and the reaction with the inside of the dechlorinating agent is relatively slow. Often, when the outlet of the dechlorinating tower does not meet the standard, the inside of the dechlorinating agent has not yet reacted completely, resulting in material waste. At the same time, since the contact surface between the molded dechlorinating agent and the gas is small, it cannot meet the high outlet requirements (such as the outlet concentration requirement <0.1ppm). (2) Dechlorination agent pulverization problem, blocking pipelines and covering hydrolysis catalysts: The dechlorination principle of dechlorination agent in the gas purification process is M x O y +2yHCl→M x Cl 2y +yH2O (M is a metal element, usually Ca, Mg, Al, etc.). Due to cost factors, calcium-based dechlorinators are widely used in current coal gas desulfurization projects. Calcium-based dechlorinators absorb HCl to generate CaCl2. CaCl2 has strong hygroscopicity and can absorb moisture in coal gas to dissolve itself, causing deformation of the material in the dechlorinator bed, affecting the compressive strength of the bed, reducing the porosity of the bed, and thus causing blockage and increased pressure loss. At the same time, the extruded dechlorinator itself has a certain powderization rate. During the dechlorination process, the powderization is aggravated by gas flushing, and the coal gas flows into the hydrolysis process to cover the hydrolysis catalyst, affecting the hydrolysis efficiency. (3) Increase the pressure loss of the fine desulfurization system: In the existing fine desulfurization process, the fixed bed dechlorination tower inevitably increases the pressure loss of the entire fine desulfurization project. (4) The dechlorinator needs to be processed and formed, which increases the cost: The dechlorinator used in the existing fine desulfurization project is obtained by mixing raw materials, binders, pore-forming agents, etc., and extruding, forming, and drying, which increases the production cost of the dechlorinator. Utility Model Content
[0005] The utility model aims to solve one of the technical problems in the related art at least to a certain extent. To this end, one purpose of the utility model is to provide a blast furnace gas dry dechlorination system. The system can use a powder dechlorinating agent, thereby significantly increasing the contact area between the dechlorinating agent and the coal gas, improving the dechlorination effect of the coal gas, and at the same time, through the use of a spiral staircase, the coal gas and the dechlorinating agent are fully reacted, significantly improving the dechlorination effect of the coal gas, and the guide plate can effectively separate the dechlorinated coal gas and the dechlorinating agent powder, thereby improving the subsequent process effect.
[0006] In one aspect of the utility model, the utility model provides a blast furnace gas dry dechlorination system. According to an embodiment of the utility model, the system comprises:
[0007] A powder material supply and transportation device, the powder material supply and transportation device is connected to one end of the first pipeline, and the powder material supply and transportation device is provided with a powder material meter;
[0008] A dechlorination device, the dechlorination device comprising a vertical reaction chamber, a powder inlet is provided at the upper end of the vertical reaction chamber, the powder inlet is connected to the other end of the first pipeline, a gas inlet is provided at the upper end of the vertical reaction chamber, the gas entering the gas inlet can atomize the powder entering the powder inlet, a vertical spiral ladder is provided in the vertical reaction chamber, the gas carries the atomized powder into the spiral ladder from the spiral ladder inlet at the upper end of the spiral ladder and moves out from the spiral ladder outlet at the lower end of the spiral ladder;
[0009] A waste recovery device, comprising a guide plate and a waste outlet, wherein the upper end of the guide plate is connected to the lower end of the spiral ladder, and the two ends of the guide plate are connected to the side wall of the vertical reaction chamber, the spiral ladder outlet is arranged on one side of the guide plate, and a gas outlet is arranged on the side wall of the vertical reaction chamber on the other side of the guide plate, and the waste outlet is arranged at the lower end of the vertical reaction chamber.
[0010] According to the blast furnace gas dry dechlorination system of the above embodiment of the utility model, it includes a powder supply and transportation device, a dechlorination device and a waste recovery device. The powder supply and transportation device is connected to one end of the first pipeline. The powder supply and transportation device transports the dechlorination agent powder to the dechlorination device through the first pipeline. The powder supply and transportation device is provided with a powder meter, and the supply amount of the dechlorination agent powder can be controlled by the powder meter. The dechlorination device includes a vertical reaction chamber. The upper end of the vertical reaction chamber is provided with a powder inlet, and the powder inlet is connected to the other end of the first pipeline. The dechlorination agent powder enters the vertical reaction chamber through the powder inlet. The upper end of the vertical reaction chamber is provided with a gas inlet. The gas entering the gas inlet has a certain pressure and can atomize the dechlorination agent powder entering the powder inlet. A vertical spiral ladder is provided in the vertical reaction chamber. The coal gas carries the atomized dechlorination agent powder into the spiral ladder from the spiral ladder inlet at the upper end of the spiral ladder and moves out from the spiral ladder outlet at the lower end of the spiral ladder. The coal gas inlet is adjacent to the powder inlet, and the pressure of the coal gas at the coal gas inlet is used to atomize the dechlorinating agent powder, and the atomized dechlorinating agent powder and the coal gas move together in the spiral staircase. On the one hand, the use of the dechlorinating agent powder and the atomization can significantly increase the contact area between the dechlorinating agent and the coal gas, thereby greatly improving the utilization rate of the dechlorinating agent and the coal gas dechlorination efficiency, and at the same time, saving the current cost of processing and molding the dechlorinating agent. On the other hand, because of the use of the spiral staircase, the contact time between the dechlorinating agent and the coal gas is extended, the reaction dead angle is reduced, and the full contact between the coal gas and the dechlorinating agent is guaranteed, so that the coal gas and the dechlorinating agent can fully react in the spiral staircase, thereby improving the dechlorination effect of the coal gas. The waste recovery device includes a guide plate and a waste outlet, the upper end of the guide plate is connected to the lower end of the spiral staircase, and the two ends of the guide plate are connected to the side wall of the vertical reaction chamber, the spiral staircase outlet is arranged on one side of the guide plate, and the side wall of the vertical reaction chamber on the other side of the guide plate is provided with a gas outlet, and the lower end of the vertical reaction chamber is provided with a waste outlet. After the coal gas and the dechlorinating agent powder pass through the spiral staircase, they pass through the spiral staircase outlet located on one side of the guide plate. At this time, due to the sudden increase in the gas path cross-section, the coal gas flow rate drops instantly, and the ability of the coal gas to carry the powder is greatly reduced. In addition, due to the effect of gravity, the coal gas and the dechlorinating agent powder are convenient for the effective separation of the coal gas and the powder. The guide plate makes the coal gas flow downward, and the air flow returns upward after passing through the guide plate. The coal gas flow rate is reduced and then returns to separate the powder smoothly. Finally, the powder sinks downward due to gravity and is discharged through the waste outlet, and the dechlorinated coal gas is discharged through the coal gas outlet. Therefore, the system can use powdered dechlorinating agent, thereby significantly increasing the contact area between the dechlorinating agent and coal gas and improving the dechlorination effect of coal gas. At the same time, through the use of spiral staircase, the coal gas and the dechlorinating agent can fully react, significantly improving the dechlorination effect of coal gas. The guide plate can effectively separate the dechlorinated coal gas and the dechlorinating agent powder, thereby improving the subsequent process effect.
[0011] In addition, the blast furnace gas dry dechlorination system according to the above embodiment of the utility model may also have the following additional technical features:
[0012] In some embodiments of the present invention, the powder supply and transportation device comprises a powder supply and transportation chamber, the powder supply and transportation chamber is provided with a powder outlet, the powder outlet is connected to one end of the first pipeline, and a one-way valve is provided on the first pipeline, thereby preventing the gas from flowing back into the powder supply and transportation device.
[0013] In some embodiments of the utility model, a screw conveyor is provided in the powder supply and transportation chamber, thereby the dechlorination agent powder can be quantitatively input.
[0014] In some embodiments of the utility model, the gas inlet is connected to a second pipeline, the gas flows through the second pipeline to the gas inlet, and the diameter of the second pipeline gradually decreases from the direction close to the gas inlet. Thus, the pressure of the gas at the gas outlet is increased, which is conducive to the atomization of the dechlorinating agent powder.
[0015] In some embodiments of the present invention, the outer wall of the spiral staircase abuts against the side wall of the vertical reaction chamber.
[0016] In some embodiments of the utility model, the coal gas outlet is located above the side wall of the vertical reaction chamber on the other side of the guide plate and below the spiral staircase, thereby improving the separation effect of coal gas and dechlorinating agent powder.
[0017] In some embodiments of the utility model, the guide plate is located at the central axis of the spiral staircase, thereby improving the separation effect of coal gas and dechlorination agent powder.
[0018] In some embodiments of the utility model, a material storage chamber is further included, the material storage chamber is in an inverted cone shape, the upper end of the material storage chamber is connected to the lower end of the vertical reaction chamber, and the lower end of the material storage chamber is provided with the waste outlet, so that the used dechlorination agent powder can be collected and discharged in a centralized manner.
[0019] In some embodiments of the utility model, a flap discharge valve is provided at the waste material outlet, so that the valve can be automatically opened according to the weight of the dechlorination agent waste that has settled to discharge the waste material.
[0020] In some embodiments of the utility model, the coal gas passes through the blast furnace gas dry dechlorination system and then enters the bag filter, thereby further removing particles carried in the dechlorinated coal gas.
[0021] In some embodiments of the present invention, the coal gas first passes through a gravity dust collector and then enters the blast furnace gas dry dechlorination system.
[0022] Additional aspects and advantages of the present invention will be given in part in the following description, and in part will become apparent from the following description, or will be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS
[0023] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:
[0024] Figure 1 This is a schematic structural diagram of a blast furnace gas dry dechlorination system according to an embodiment of the utility model;
[0025] Figure 2 It is a schematic structural diagram of a blast furnace gas dry dechlorination system according to another embodiment of the utility model. DETAILED DESCRIPTION
[0026] The embodiments of the present invention are described in detail below, which are intended to explain the present invention and should not be construed as limiting the present invention.
[0027] In one aspect of the utility model, the utility model provides a blast furnace gas dry dechlorination system. According to an embodiment of the utility model, a blast furnace gas dry dechlorination system. According to an embodiment of the utility model, reference Figure 1 The system includes: a powder supplying and transporting device 100, a dechlorination device 200 and a waste recovery device 300.
[0028] According to an embodiment of the utility model, the powder supplying device 100 is connected to one end of the first pipeline 110, and the powder supplying device 100 is provided with a powder meter. The powder supplying device 100 transports the dechlorinating agent powder to the dechlorinating device 200 through the first pipeline 110, and the supply amount of the dechlorinating agent powder can be controlled by the powder meter.
[0029] According to the embodiment of the present utility model, referring to Figure 2 The powder supply and transportation device 100 includes a powder supply and transportation chamber 120, which is provided with a powder outlet 121, which is connected to one end of the first pipeline 110, and a one-way valve 130 is provided on the first pipeline 110. Because the blast furnace gas itself has a pressure of 0.2-0.3 MPa, the one-way valve 130 can prevent the blast furnace gas from pushing the powder back into the powder supply and transportation chamber 120. Furthermore, a screw conveyor (not shown) is provided in the powder supply and transportation chamber 120. The screw conveyor controls the rotation speed through the frequency converter to achieve the purpose of controlling the feeding speed, realizes the linkage between the feeding amount and the HCl concentration and the gas volume in the gas, and avoids material waste.
[0030] According to an embodiment of the utility model, the dechlorination device 200 includes a vertical reaction chamber 210, and a powder inlet 220 is provided at the upper end of the vertical reaction chamber 210. The powder inlet 220 is connected to the other end of the first pipeline 110. The dechlorinating agent powder enters the vertical reaction chamber 210 through the powder inlet 220. A gas inlet 230 is provided at the upper end of the vertical reaction chamber 210. The gas entering the gas inlet 230 has a certain pressure and can atomize the dechlorinating agent powder entering the powder inlet 220. A vertical spiral ladder 240 is provided in the vertical reaction chamber 210. The gas carries the atomized dechlorinating agent powder into the spiral ladder 240 from the spiral ladder inlet 241 at the upper end of the spiral ladder 240 and moves out from the spiral ladder outlet 242 at the lower end of the spiral ladder 240. The gas inlet 230 is adjacent to the powder inlet 220. The pressure of the gas at the gas inlet 230 is used to atomize the dechlorinating agent powder, and the atomized dechlorinating agent powder and the gas move together in the spiral staircase 240. On the one hand, the use of the dechlorinating agent powder and the atomization can significantly increase the contact area between the dechlorinating agent and the gas, thereby greatly improving the utilization rate of the dechlorinating agent and the gas dechlorination efficiency, and at the same time, saving the cost of the current dechlorinating agent processing. On the other hand, because of the use of the spiral staircase 240, the contact time between the dechlorinating agent and the gas is extended, the reaction dead angle is reduced, and the full contact between the gas and the dechlorinating agent is guaranteed, so that the gas and the dechlorinating agent can fully react in the spiral staircase 240, thereby improving the dechlorination effect of the gas.
[0031] It is understood by those skilled in the art that the number of layers of the spiral staircase 240 is the number of circles of the gas in the tower. At the same time, the gas flow rate can be controlled according to the height of a single layer of the spiral staircase 240. The number of layers of the spiral staircase 240 and the height of a single layer of the spiral staircase 240 can be appropriately adjusted according to the working condition design and process parameters.
[0032] According to the embodiment of the utility model, the gas inlet 230 is connected to the second pipe 231, and the gas flows through the second pipe 231 to the gas inlet 230, and the diameter of the second pipe 231 gradually decreases from the direction close to the gas inlet 230. By designing the second pipe 231 connected to the gas inlet 230 to be variable in diameter, the gas flow rate can be appropriately increased while taking into account the back pressure, and the pressure of the gas at the gas outlet 230 is increased, thereby improving the atomization effect of the dechlorinating agent powder.
[0033] According to an embodiment of the utility model, the spiral outer wall of the spiral ladder 240 abuts against the side wall of the vertical reaction chamber 210, thereby improving the sealing performance between the spiral outer wall 240 and the vertical reaction chamber 210, so that the dechlorination agent powder can be completely moved from the spiral ladder.
[0034] According to an embodiment of the utility model, the waste recovery device 300 includes a guide plate 310 and a waste outlet 320, the upper end of the guide plate 310 is connected to the lower end of the spiral ladder 240, and the two ends of the guide plate 310 are connected to the side wall of the vertical reaction chamber 210, the outlet of the spiral ladder 240 is arranged on one side of the guide plate 310, and the side wall of the vertical reaction chamber 210 on the other side of the guide plate 310 is provided with a gas outlet 330, and the lower end of the vertical reaction chamber 210 is provided with a waste outlet 320. After the coal gas and the dechlorinating agent powder pass through the spiral staircase 240, they pass through the spiral staircase outlet 242 and are located on one side of the guide plate 310. At this time, due to the sudden increase in the gas path cross-section, the coal gas flow rate drops instantly, and the coal gas's ability to carry the powder is greatly reduced. In addition, due to the gravity of the dechlorinating agent powder, it is convenient for the coal gas and the powder to be effectively separated. The guide plate 310 allows the coal gas to flow downward, and the airflow passes through the guide plate 310 and turns upward. The coal gas flow rate decreases and then turns back to smoothly separate the powder. Finally, the powder sinks downward due to gravity and is discharged through the waste outlet 320. The dechlorinated coal gas is discharged through the coal gas outlet 330. Further, the guide plate 310 is located at the central axis of the spiral staircase 240.
[0035] It should be noted that the vertical height of the guide plate 310 is not particularly limited, and is mainly affected by the size of the reaction tank and the airflow. Those skilled in the art can design the height of the guide plate 310 according to the size of the reaction tank and the airflow.
[0036] According to an embodiment of the utility model, the coal gas outlet 330 is located above the side wall of the vertical reaction chamber 210 on the other side of the guide plate 310 and below the spiral staircase 240. The position of the coal gas outlet 330 is far away from the bottom end of the guide plate 310, which can extend the separation path of the coal gas and the dechlorination agent powder, and improve the separation effect of the coal gas and the dechlorination agent powder.
[0037] According to the embodiment of the present utility model, referring to Figure 2 , and further includes a material storage chamber 400, which is in an inverted cone shape, the upper end of which is connected to the lower end of the vertical reaction chamber 210, and the lower end of which is provided with a waste outlet 320. The dechlorinating agent powder is deposited downward after passing through the guide plate 310 and its own gravity. By setting up the material storage chamber 400, the deposited dechlorinating agent powder can be collected and then discharged in a centralized manner, which is convenient for the subsequent treatment of the dechlorinating agent powder.
[0038] According to the embodiment of the utility model, a flap discharge valve 410 is provided at the waste outlet 320. When a certain weight of dechlorinating agent powder is deposited in the unloading storage chamber 400, the flap discharge valve 410 can automatically open the valve to discharge the waste according to the weight of the settled dechlorinating agent waste, thereby saving the cost of manual loading and unloading and reducing the operation and maintenance cost of blast furnace gas fine desulfurization through the design of automatic unloading.
[0039] Therefore, the system can use powdered dechlorinating agent, thereby significantly increasing the contact area between the dechlorinating agent and coal gas and improving the dechlorination effect of coal gas. At the same time, through the use of spiral staircase, the coal gas and the dechlorinating agent can fully react, significantly improving the dechlorination effect of coal gas. The guide plate can effectively separate the dechlorinated coal gas and the dechlorinating agent powder, thereby improving the subsequent process effect.
[0040] According to the embodiment of the utility model, the coal gas passes through the blast furnace gas dry dechlorination system and then enters the bag filter (not shown). The inventor of the utility model found that in the entire dechlorination process, the particle size of the material has a greater impact on the effect. If the powder is finer, such as larger than 100 mesh, it will inevitably flow into the bag filter with the coal gas, and be intercepted in the bag filter, effectively avoiding the flow of the coal gas to the hydrolysis process or the desulfurization process, ensuring the reaction environment of the hydrolyzer and the desulfurizer. Therefore, the blast furnace gas dry dechlorination system is designed before the bag filter.
[0041] According to an embodiment of the utility model, the coal gas first passes through a gravity dust collector (not shown) and then enters the blast furnace gas dry dechlorination system.
[0042] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" 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 representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.
[0043] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations of the present invention. A person skilled in the art may change, modify, replace and vary the above embodiments within the scope of the present invention.
Claims
1. A blast furnace gas dry dechlorination system, characterized in that: include: A powder material supply and transportation device, the powder material supply and transportation device is connected to one end of the first pipeline, and the powder material supply and transportation device is provided with a powder material meter; A dechlorination device, the dechlorination device comprising a vertical reaction chamber, a powder inlet is provided at the upper end of the vertical reaction chamber, the powder inlet is connected to the other end of the first pipeline, a gas inlet is provided at the upper end of the vertical reaction chamber, the gas entering the gas inlet can atomize the powder entering the powder inlet, a vertical spiral ladder is provided in the vertical reaction chamber, the gas carries the atomized powder into the spiral ladder from the spiral ladder inlet at the upper end of the spiral ladder and moves out from the spiral ladder outlet at the lower end of the spiral ladder; A waste recovery device, comprising a guide plate and a waste outlet, wherein the upper end of the guide plate is connected to the lower end of the spiral ladder, and the two ends of the guide plate are connected to the side wall of the vertical reaction chamber, the spiral ladder outlet is arranged on one side of the guide plate, and a gas outlet is arranged on the side wall of the vertical reaction chamber on the other side of the guide plate, and the waste outlet is arranged at the lower end of the vertical reaction chamber.
2. The system according to claim 1, characterized in that The powder supply and transportation device comprises a powder supply and transportation chamber, the powder supply and transportation chamber is provided with a powder outlet, the powder outlet is connected to one end of the first pipeline, and a one-way valve is provided on the first pipeline.
3. The system according to claim 2, characterized in that A screw conveyor is arranged in the powder supply and transportation cavity.
4. The system according to claim 1, characterized in that The gas inlet is connected to a second pipeline, and the gas flows through the second pipeline to the gas inlet. The diameter of the second pipeline gradually decreases from the direction close to the gas inlet.
5. The system according to claim 1 or 2, characterized in that: The outer wall of the spiral staircase is in contact with the side wall of the vertical reaction chamber.
6. The system according to claim 1 or 2, characterized in that: The coal gas outlet is located above the side wall of the vertical reaction chamber on the other side of the guide plate and below the spiral staircase.
7. The system according to claim 1 or 2, characterized in that: The guide plate is located at the central axis of the spiral staircase.
8. The system according to claim 1 or 2, characterized in that: It also includes a material storage chamber, which is in an inverted cone shape. The upper end of the material storage chamber is connected to the lower end of the vertical reaction chamber, and the lower end of the material storage chamber is provided with the waste outlet.
9. The system according to claim 8, characterized in that A flap discharge valve is provided at the waste outlet.
10. The system according to claim 1 or 2, characterized in that: The coal gas passes through the blast furnace gas dry dechlorination system and then enters the bag filter; And / or, the coal gas first passes through a gravity dust collector and then enters the blast furnace gas dry dechlorination system.