Series runoff type blast furnace gas purification treatment system

Abstract

The utility model discloses a tandem radial flow type blast furnace gas purification treatment system which is characterized in that filler for purification treatment is controlled to sequentially pass through a plurality of filler areas integrally in a vertical barrel shape and flow from top to bottom in the filler areas, and meanwhile, gas is controlled to sequentially enter the filler areas in an opposite sequence; purification treatment is realized through contact between the filler area and the filler in the filler area along the circumferential periphery in a horizontal runoff manner. The device and the method have the advantages of higher filler utilization efficiency, higher desulfurization efficiency, better effect, convenience in process control, good safety, lower equipment cost and the like, and are particularly suitable for the fine desulfurization process of the blast furnace gas.

Description

Technical Field

[0001] The utility model relates to the technical field of blast furnace gas purification and treatment, in particular to a series radial flow type blast furnace gas purification and treatment system. Background Art

[0002] Blast furnace gas is the exhaust gas from a blast furnace containing combustible gases such as carbon monoxide and hydrogen produced during the ironmaking process of a blast furnace. It is a byproduct of blast furnace ironmaking. Blast furnace gas can usually be used as a gas fuel in the metallurgical industry or in boiler gas applications. However, blast furnace gas contains a large amount of harmful components, mainly hydrogen sulfide, and the flue gas produced by combustion needs to be purified before it can be discharged, which greatly limits the application of blast furnace gas. Therefore, now more blast furnace gas is desulfurized and purified before it is exported for use.

[0003] Existing blast furnace gas purification usually adopts a fine desulfurization treatment process, first removing hydrogen chloride in the gas to prevent it from affecting the subsequent hydrolysis reaction; then a hydrolysis reaction is carried out to decompose and remove carbonyl sulfide in the gas to generate hydrogen sulfide; finally, harmful gas components such as hydrogen sulfide are adsorbed. CN201910728476.X once disclosed a comprehensive environmental protection system and process for ironmaking blast furnace gas, and CN202110892639.5 once disclosed a blast furnace gas step-by-step dry deacidification system and method and other patents, which are similar to these three-step treatment principles. However, in the existing gas desulfurization technology, most of the steps are treated in a fixed bed. During fixed bed desulfurization, the filler is fixedly laid in the gas flow channel, which has the following defects. 1 After the purification filler loses its activity, the equipment needs to be shut down to replace the filler, which is inconvenient to operate and reduces production efficiency. 2. The vitality of the packing near the air inlet position is lost faster, while the vitality of the packing near the air outlet position is lost slower. When the harmful components in the outlet gas exceed the standard and the packing needs to be replaced, the packing near the outlet position still has strong vitality, resulting in waste and low overall utilization efficiency of the packing. 3. The packing is fixedly laid for use. When the air inlet flow rate and other conditions change, it cannot be adjusted accordingly, resulting in poor stability of the treatment effect. 4. Existing desulfurization equipment is usually a vertical structure, which has a higher relative equipment cost.

[0004] Therefore, how to design a blast furnace gas desulfurization technology that can replace fillers online, has higher filler utilization efficiency, higher production efficiency, more convenient reaction process control, better safety, and lower cost has become a difficult problem that technical personnel in this field need to consider and solve. Utility Model Content

[0005] In view of the above-mentioned deficiencies in the prior art, the technical problem to be solved by the utility model is: how to provide a series radial flow blast furnace gas purification treatment system with higher filler utilization efficiency, higher desulfurization efficiency, better effect, convenient process control, good safety and lower equipment cost, so that it is particularly suitable for the fine desulfurization of blast furnace gas.

[0006] In order to solve the above technical problems, the utility model adopts the following technical solutions:

[0007] A series radial flow blast furnace gas purification and treatment system is characterized in that it includes a plurality of radial flow purification towers arranged in parallel, the radial flow purification towers include and a vertically arranged outer shell, an inner and outer layer of cylindrical air filter baffles are coaxially spaced apart in the outer shell, a filling area is formed between the two layers of air filter baffles, a gas chamber is formed inside the inner layer of the air filter baffle and outside the outer layer of the air filter baffle, a feeding device is provided at the upper end of the outer shell and is communicated with the filling area, a discharging device is provided at the lower end of the outer shell and is communicated with the filling area, an air inlet is provided on one side of the lower end of the outer shell and is communicated with a gas chamber, an air outlet is provided on the other side of the upper end and is communicated with another gas chamber, and the air outlet of the upper purification tower is connected to the air inlet of the adjacent next purification tower through a pipeline.

[0008] In this way, when the equipment is running, the coal gas to be purified enters a gas chamber in the housing of the equipment from the air inlet at the lower end of the first radial purification tower in the forward direction of the airflow. The filler in the purification tower is controlled by the feeding device to feed and the discharge device to discharge to realize the downward flow control of the filler in the inner cavity. The coal gas entering the gas chamber can pass through the filler area from the surrounding ring upward along the horizontal diameter direction and contact the filler for purification reaction. The coal gas after the reaction is gathered in another gas chamber and discharged from the air outlet to the next purification tower. Therefore, the filler in the purification tower can be automatically replaced online, and the contact area between the coal gas and the filler area is large, and the reaction efficiency is high. At the same time, since each purification tower is independently set, and a discharge device is set at the lower end of each purification tower, the filler in the purification tower located in the front of the airflow in the equipment can be controlled to be sent to the rear filler tower for treatment in sequence after discharging, so as to realize the processing method of countercurrent control of the overall operation of the filler and the direction of the airflow. This countercurrent control processing method maximizes the efficiency and effect of the filler reaction and avoids the waste of filler. Moreover, compared with the method of using a higher purification tower as a whole, this structural method of connecting multiple purification towers in series reduces the height of the purification tower while ensuring the flow of the filler, avoiding the defect that the filler below is easily crushed under gravity due to its excessive height, thereby blocking the pores of the filler and reducing the fluidity of the airflow.

[0009] Furthermore, the overall shell is in a vertical cylindrical shape, so that the pressure at various positions of the shell is uniform and stable, reducing the presence of stress concentration positions and wind dead angle positions, and better ensuring the smoothness and stability of the device operation.

[0010] Furthermore, in each purification tower, the outer filter baffle is supported and fixed on the outer shell by means of horizontal connecting rods, and the inner filter baffle is supported and fixed on the outer filter baffle by means of horizontal connecting rods. This facilitates fixed support.

[0011] Furthermore, in each purification tower, the air inlet is connected to the gas chamber located on the outside, and the air outlet is connected to the gas chamber located on the inside.

[0012] In this way, the connection and setting of the air inlet and outlet structures are simpler, and air inlet and outlet are more convenient.

[0013] Furthermore, in the purification tower, an annular air distribution chamber is arranged around the outer periphery of the lower end of the shell, the air inlet is arranged on one side of the air distribution chamber, and air holes with a diameter smaller than the filler particle size are evenly distributed on the side wall of the shell in the air distribution chamber.

[0014] In this way, even air intake can be achieved over the entire ring, avoiding imbalance caused by air intake in one direction.

[0015] Furthermore, a harmful component detection probe is provided in the inner gas chamber and is connected to the control center.

[0016] In this way, the treatment effect of each purification tower can be better detected and fed back in real time to facilitate control.

[0017] Furthermore, the air filter baffle is in the shape of a cylindrical plate as a whole, and is provided with a plurality of air holes with diameters smaller than the particle size of the filler, so that the structure of the air filter baffle is simpler, and the strength of the equipment is more stable and reliable.

[0018] Furthermore, a supporting device is provided in the filling area, and the supporting device includes a supporting plate horizontally arranged along the annular direction of the filling area. The supporting plate is generally conical ring-shaped, and one side (inside or outside) of the supporting plate is connected to the side wall of the filling area, and the other side is suspended obliquely downward.

[0019] In this way, the setting of the support plate plays a certain supporting role on the upper filler without affecting the downward flow of the filler, thereby preventing the filler at the bottom of the filler area from being broken by excessive pressure, affecting the reaction effect and gas outlet quality.

[0020] Furthermore, the supporting device includes a long supporting plate (with a width dimension larger than the short supporting plate) and a short supporting plate respectively fixed on the side walls on both sides of the filling area, and the suspended ends of the long supporting plate and the short supporting plate are respectively arranged at oblique and staggered intervals relative to each other.

[0021] In this way, there are upward supporting force positions on the entire cross-section of the filler area, avoiding gaps and leaks, ensuring balanced and stable upward support, thus ensuring the uniformity of the downward flow of the filler and the stability of the desulfurization reaction.

[0022] Furthermore, multiple groups of supporting devices are arranged in the packing area along the height direction, so that the height of the packing area and the shell can be extended as much as possible, thereby improving the treatment effect.

[0023] Furthermore, in any two groups of supporting devices at adjacent upper and lower positions, the positions of the long supporting plates and the short supporting plates are arranged to be opposite to each other on the left and right sides, so as to better ensure the overall balance of the supporting force during the downward flow of the filler.

[0024] Furthermore, in the supporting device, the long supporting plate is located below the short supporting plate, and the long supporting plate is composed of a plurality of fan-shaped supporting plate single blocks evenly distributed in the circumferential direction, and the upper end of the supporting plate single block is hingedly mounted on the side wall in the filling area, and the lower part of the supporting plate single block is supported and connected to the side wall in the corresponding filling area through a supporting spring.

[0025] This is because the gas treatment in this scheme is a dynamic process, and the gas flow rate may fluctuate. When the gas flow rate is large, the feeding speed of the filler can be adjusted accordingly to ensure the reaction treatment effect, but the fixed support plate will hinder the flow rate adjustment of the filler. Therefore, in this scheme, the long support plate is further set below the short support plate, and it is evenly broken along the circumference and set as a rotatable elastic support structure. In this way, when the downward flow rate of the filler accelerates, the support plate will automatically rotate downward due to the increased force, so that its own supporting force becomes smaller, and at the same time, the gap distance between the long support plate and the short support plate is automatically increased, which is more conducive to the downward flow of the filler and facilitates the adjustment and control of the filler flow rate to better ensure the treatment effect.

[0026] Furthermore, the support spring is a coil spring and is made of shape memory alloy material.

[0027] This is because the reaction of coal gas in the packing channel is a dynamic process, coupled with the temperature of the coal gas itself and the heat released by the reaction, the temperature in the packing channel usually fluctuates within a temperature range (the reaction temperature range usually fluctuates around 100℃±50℃). A high temperature indicates a relatively violent reaction, and a low temperature indicates a relatively gentle reaction. Therefore, after the support spring is designed as a memory alloy material, in addition to its own spring function, it can adjust and increase the gap distance between the long support plate and the short support plate under stress, and it can also sense the temperature. When the temperature increases (indicating a violent reaction), it shrinks through its own deformation, actively drives the long support plate to rotate downward, increases the gap distance between the long support plate and the short support plate, reduces obstacles, and increases the rate of downward flow of the packing, achieving the effect of active adjustment.

[0028] Furthermore, the support spring is formed by connecting multiple sections of different shape memory alloy materials in the length direction, the length of each section of the shape memory alloy material is gradually increased, and the deformation temperature of each section of the shape memory alloy material is gradually increased within the reaction temperature range inside the filler area.

[0029] In this way, graded regulation can be achieved within the reaction fluctuation temperature range. The more intense the reaction and the higher the temperature, the greater the active contraction of the support spring, so that the downward flow rate of the filler more accurately matches the degree of filler reaction.

[0030] Furthermore, the upper end of the support plate block is rotatably mounted in a mounting groove on the inner side wall of the filler area, and a flexible sealing skin is connected around the support plate block and between the inner side wall of the corresponding filler area.

[0031] In this way, a flexible seal is achieved on the inner side of the single support plate, preventing the upper hinge and the lower support spring from failing due to material inclusions, thereby ensuring the stability of the device operation.

[0032] Furthermore, the automatic feeding control device includes a feeding funnel arranged at the center position above the shell corresponding to the filling area position, and also includes a feeding container connected between the feeding funnel and the filling area, an upper feeding switch valve is arranged between the feeding funnel and the feeding container, a lower feeding switch valve is arranged between the feeding container and the shell, and a feeding gas replacement inlet with a switch is also arranged on one side of the feeding container, and the feeding gas replacement inlet is connected to the safety gas source container through a safety gas access pipeline and an air pump, and a feeding gas replacement outlet with a switch is correspondingly arranged on the other side of the feeding container.

[0033] In this way, when feeding, the filler is first introduced into the feeding funnel, the lower switch valve of the feeding is in a closed state, the upper switch valve of the feeding is opened, the filler is first allowed to enter the feeding container, and then the upper switch valve of the feeding is closed. At this time, the feed gas replacement inlet and the feed gas replacement outlet are first opened, and the safe gas is introduced into the feeding container to squeeze out the air in the gap of the filler and discharge it through the feed gas replacement outlet, and then the feed gas replacement inlet and the feed gas replacement outlet are closed. Then the lower switch valve of the feeding is opened, and the filler in the feeding container can flow downward into the filler area by its own weight, realizing the automatic downward flow and replenishment of the filler, and ensuring the mobile reaction treatment process. In this way, the oxygen component in the air can be prevented from entering the filler area together with the filler, causing deflagration during the reaction and damaging the equipment, thereby improving the safety of the equipment operation.

[0034] Furthermore, the safety gas is nitrogen, which has the advantages of low cost and good safety. Of course, other gases that do not react with coal gas, such as inert gas or carbon dioxide, can also be used in implementation.

[0035] Furthermore, an oxygen sensor is provided at the outlet of the feed gas replacement and is connected to the control center.

[0036] In this way, the oxygen sensor can detect the oxygen content at the displacement outlet. When the oxygen content is lower than a preset threshold (e.g., 0.5%), it can be determined that the air has been exhausted, which facilitates accurate control and execution of subsequent operations. During implementation, the control center can further connect and control the upper switch valve for feeding, the lower switch valve for feeding, the switch at the gas displacement inlet for feeding, and the air pump, so that the above detection and control process can be automated.

[0037] Furthermore, a carbon monoxide sensor is designed at the outlet of the feed gas replacement outlet and is connected to the control center.

[0038] In this way, when all the fillers in the feed container are fed, before the next feeding, the lower feed switch valve can be closed first, the upper feed switch valve can be kept in a closed state, and then the feed gas replacement inlet and feed gas replacement outlet are opened, and the safety gas is introduced into the feed container, and the coal gas overflowing from the filler area inside the shell into the feed container is squeezed out and discharged through the feed gas replacement outlet. When the carbon monoxide sensor detects that the carbon monoxide concentration at the feed gas replacement outlet is lower than the preset value (for example, 0.5%), it can be determined that the coal gas has been discharged. At this time, the feed gas replacement inlet and feed gas replacement outlet can be closed, waiting for the next feeding. In this way, it is possible to well avoid the coal gas in the filler area inside the shell from overflowing during feeding to cause a safety accident.

[0039] Furthermore, the feed upper switch valve comprises two switch valves which are connected in series and arranged in parallel up and down, including a non-sealed switch valve located at the upper part and a sealed switch valve located at the lower part.

[0040] In this way, after the filler enters the feed container from the feed funnel, when closing the upper switch valve of the feed, the non-sealed switch valve can be closed first to quickly cut off the flow of the filler, and then the sealed switch valve can be closed. At the same time, when opening the upper switch valve, the sealed switch valve can be opened first, and then the non-sealed switch valve can be opened. In this way, it can be ensured that the sealed switch valve is not affected by the filler when closing and opening, so that it does not contact the filler as much as possible, and the sealing effect and durability are better guaranteed. During implementation, the non-sealed switch valve located at the top can be a plug valve or a butterfly valve, which is sensitive, fast and low-cost, and the sealed switch valve located at the bottom can be a ball valve or a blind plate valve to ensure a good sealing effect.

[0041] Furthermore, the feed lower switch valve comprises two switch valves which are connected in series and arranged in parallel up and down, including a flow regulating switch valve located at the top and a sealing switch valve located at the bottom.

[0042] In this way, when the feed container feeds into the packing area, the flow regulating switch valve can be used to adjust the speed of the feed to match the gas flow, ensuring that the reaction treatment effect can be ensured even when the gas flow fluctuates. At the same time, when sealing is required, the sealing switch valve can be used to achieve sealing and minimize contact with the packing, thereby better ensuring the sealing effect and durability.

[0043] In addition, during implementation, a feed retention container can be further connected in series between the lower part of the feed container and the outer shell to communicate with the filler area. This is because the structure and function of the above-mentioned feeding device is to realize batch feeding to remove oxygen mixed in the feed and ensure the sealing effect of the feed. Therefore, after adding another feed retention container, the filler first enters the feed retention container and accumulates, and the feed retention container can be used to realize uninterrupted continuous feeding inside the filler channel to avoid the impact of feeding stopping on the reaction during the air removal process. Furthermore, a flow regulating valve is set between the feed retention container and the outer shell and connected to the control center, so that the feed flow rate can be controlled as needed.

[0044] Furthermore, the discharging device includes a discharging container which is connected to the filling area and is arranged in the center position below the shell. A discharging port is downwardly arranged at the lower end of the discharging container. An upper discharging switch valve is arranged between the discharging container and the shell. A lower discharging switch valve is arranged between the discharging container and the discharging port. A discharging gas replacement inlet with a switch is also arranged on one side of the discharging container. The discharging gas replacement inlet is connected to the safety gas source container through a safety gas access pipeline and an air pump. A discharging gas replacement outlet with a switch is correspondingly arranged on the other side of the discharging container.

[0045] In this way, during discharging, the lower discharging switch valve is in a closed state, and the upper discharging switch valve is opened, so that the reacted filler enters the discharging container first. When the accumulated filler in the discharging container is almost full, close the upper discharging switch valve, and then open the discharging gas replacement inlet and the discharging gas replacement outlet first, and introduce safety gas into the discharging container to squeeze out the coal gas mixed in the gap of the filler and discharge it through the discharging gas replacement outlet. Then close the discharging gas replacement inlet and the discharging gas replacement outlet. Then open the lower discharging switch valve, and the filler in the discharging container can flow out of the device downward by its own weight to achieve discharging. In this way, the leakage of coal gas mixed in the outflowing filler can be avoided, and the safety of equipment operation is improved.

[0046] Furthermore, the safety gas is nitrogen, which has the advantages of low cost and good safety. Of course, other gases that do not react with coal gas, such as inert gas or carbon dioxide, can also be used in implementation.

[0047] Furthermore, a carbon monoxide sensor is provided at the outlet for gas replacement of the discharging material and is connected to the control center.

[0048] In this way, the carbon monoxide concentration at the outlet of the gas replacement for discharging can be detected by the carbon monoxide sensor. When the concentration is lower than the preset value (for example, 0.5%), it can be determined that the gas in the discharging container has been completely replaced and discharged, which is convenient for accurate control and execution of subsequent operations. Furthermore, the control center can be connected to and controlled by the upper discharging switch valve, the lower discharging switch valve, the gas replacement inlet for discharging, the switch at the gas replacement inlet for discharging, and the air pump, so that the above-mentioned detection and control process can be automated.

[0049] Furthermore, an oxygen sensor connected to the control center is also provided at the outlet position for gas replacement of the discharging material.

[0050] In this way, after the filling material in the discharge container is discharged, before the next discharge, the lower discharge switch valve can be closed first, and the upper discharge switch valve can be kept in a closed state. Then open the discharge gas replacement inlet and the discharge gas replacement outlet, and introduce safe gas into the discharge container to squeeze out the air inside and discharge it through the discharge gas replacement outlet. When exhausting, the exhaust effect is detected by the oxygen sensor. When the oxygen content is lower than the preset threshold (for example, 0.5%), it can be judged that the air has been exhausted, which is convenient for precise control and execution of subsequent operations. In this way, it is avoided that the air enters the filling area in the shell from the discharge device during the next discharge, causing explosion during the reaction and damaging the equipment, thereby improving the safety of equipment operation.

[0051] Furthermore, the discharge upper switch valve comprises two switch valves which are connected in series and arranged in parallel, including a flow regulating switch valve located at the top and a sealing switch valve located at the bottom.

[0052] In this way, the flow regulating switch valve can be used to adjust the size of the discharge speed from the packing area to the discharge container, so that it matches the flow speed of the packing in the packing area, ensures that the flow speed of the packing matches the gas flow rate, and ensures the reaction effect. At the same time, when the packing enters the discharge container, when closing the discharge switch valve, the flow regulating switch valve can be closed first to quickly cut off the flow of the packing, and then the sealing switch valve is closed. When the subsequent discharge is opened, the sealing switch valve is opened first and then the flow regulating switch valve is opened. In this way, it can be ensured that the sealing switch valve is not affected by the flow of the packing when closing and opening, so that it is not in contact with the packing as much as possible, and the sealing effect and durability are better guaranteed. During implementation, the non-sealed switch valve located above can be a plug valve or a butterfly valve, which is sensitive, fast and low-cost, and the sealed switch valve located below can be a ball valve or a blind plate valve to ensure a good sealing effect.

[0053] Furthermore, the discharge lower switch valve comprises two switch valves which are connected in series and arranged in parallel, including a non-sealed switch valve located at the upper part and a sealed switch valve located at the lower part.

[0054] In this way, when the switch valve is opened at the discharge, the sealed switch valve is opened first and then the non-sealed switch valve is opened, and when the switch valve is closed at the discharge, the non-sealed switch valve is closed first and then the sealed switch valve. In this way, the feed of the sealed switch valve does not contact the packing, ensuring that the opening and closing of the sealed switch valve is not affected by the flow of the packing, and ensuring the reliability and durability of its sealing.

[0055] In addition, during implementation, a discharge retention container can be further connected in series between the top of the discharge container and the outer shell to communicate with the filler area. This is because the structure and function of the above-mentioned discharge device is to achieve batch discharge to remove the coal gas mixed in the discharge and ensure the sealing effect of the discharge. Therefore, after adding another discharge retention container, the filler will first enter the discharge retention container and accumulate when discharging. The discharge retention container can realize uninterrupted continuous discharge inside the filler channel, avoiding the impact of discharge stopping on the reaction during the process of removing the coal gas mixed in the discharge. Furthermore, a flow regulating valve is set between the discharge retention container and the outer shell and connected to the control center, so that the discharge flow rate can be controlled as needed.

[0056] Furthermore, a material receiving container is provided at the outlet of the discharge device at the lower end of the purification tower located in front of the airflow, and the material receiving container is connected to the feeding device (feeding funnel) above the next purification tower in the opposite direction of the airflow through the filler conveying device.

[0057] In this way, the packing of each purification tower is directly connected in series along the direction of counter-flow by the packing conveying mechanism, realizing the aforementioned processing method of counter-flow control of the overall operation of the packing and the direction of the airflow. The utilization rate of the packing is guaranteed and the inconvenience of manual handling is avoided. During implementation, the packing conveying mechanism can be implemented by existing conveying devices such as chain hook machine or screw conveyor.

[0058] During implementation, the series radial flow blast furnace gas purification treatment system can be provided with three sets. The filler in the first set uses hydrogen chloride adsorbent filler to form a dechlorination (i.e., deacidification) purification unit, the filler in the second set uses carbonyl sulfide hydrolysis catalyst filler to form a hydrolysis purification unit, and the filler in the third set uses desulfurization adsorbent filler to form a desulfurization purification unit. The gas outlet end of the dechlorination purification unit is connected to the gas inlet end of the hydrolysis purification unit, and then the gas outlet end of the hydrolysis purification unit is connected to the gas inlet end of the desulfurization purification unit.

[0059] In this way, three sets of equipment are used in series, and different fillers are used to react and treat the coal gas, so that the fine desulfurization process of the coal gas can be achieved.

[0060] Therefore, this solution is used for the desulfurization of coal gas and can realize the fine desulfurization process. In principle, the solution eliminates the problems of deflagration and pollutant leakage during the loading / discharging of materials (catalysts / adsorbents), greatly improves the overall operation safety, and significantly improves the purification efficiency of pollutants. In addition, this solution realizes the automatic replacement of materials, and can adjust the flow of fillers according to the corresponding gas flow to match it, ensuring the reaction effect and utilization efficiency of the fillers, avoiding waste, and ensuring that the gas purification is in a high-efficiency and stable operation state for a long time.

[0061] Therefore, in summary, the present application has the advantages of higher filler utilization efficiency, higher desulfurization efficiency, better effect, convenient process control, good safety, lower equipment cost, etc., and is particularly suitable for the fine desulfurization process of blast furnace gas. BRIEF DESCRIPTION OF THE DRAWINGS

[0062] Figure 1 The schematic diagram of the structure of the series radial flow blast furnace gas purification system used in the embodiment of the utility model is shown in FIG. The arrows in the figure indicate the flow direction of the gas.

[0063] Figure 2 for Figure 1 Schematic diagram of the structure of a single purification tower.

[0064] Figure 3 for Figure 2 Transverse section view of the middle part of the middle shell.

[0065] Figure 4 for Figure 2 Schematic diagram of the structure of a single supporting plate in a separate supporting device.

[0066] Figure 5 For specific implementation, three groups Figure 1 Structural schematic diagram of the systems connected in series and used for blast furnace gas desulfurization treatment. DETAILED DESCRIPTION

[0067] The utility model is further described in detail below in conjunction with specific implementation methods.

[0068] Best embodiment: A series radial flow blast furnace gas purification system, see Figure 1-4 As shown, it includes a plurality of radial flow purification towers arranged in parallel, and the radial flow purification tower includes and a vertically arranged outer shell 1, wherein the inner and outer layers of cylindrical air filter baffles 2 are coaxially spaced apart in the outer shell 1, and a filling area 3 is formed between the two layers of air filter baffles 2, and a gas chamber 4 is formed inside the inner layer of the air filter baffle and outside the outer layer of the air filter baffle respectively, a feeding device is provided at the upper end of the outer shell and is communicated with the filling area 3, a discharging device is provided at the lower end of the outer shell 1 and is communicated with the filling area, an air inlet 5 is provided on one side of the lower end of the outer shell and is communicated with a gas chamber, and an air outlet 6 is provided on the other side of the upper end and is communicated with another gas chamber, and the air outlet of the upper purification tower is connected to the air inlet of the adjacent next purification tower through a pipeline.

[0069] In this way, when the equipment is running, the coal gas to be purified enters a gas chamber in the housing of the equipment from the air inlet at the lower end of the first radial purification tower in the forward direction of the airflow. The filler in the purification tower is controlled by the feeding device to feed and the discharge device to discharge to realize the downward flow control of the filler in the inner cavity. The coal gas entering the gas chamber can pass through the filler area from the surrounding ring upward along the horizontal diameter direction and contact the filler for purification reaction. The coal gas after the reaction is gathered in another gas chamber and discharged from the air outlet to the next purification tower. Therefore, the filler in the purification tower can be automatically replaced online, and the contact area between the coal gas and the filler area is large, and the reaction efficiency is high. At the same time, since each purification tower is independently set, and a discharge device is set at the lower end of each purification tower, the filler in the purification tower located in the front of the airflow in the equipment can be controlled to be sent to the rear filler tower for treatment in sequence after discharging, so as to realize the processing method of countercurrent control of the overall operation of the filler and the direction of the airflow. This countercurrent control processing method maximizes the efficiency and effect of the filler reaction and avoids the waste of filler. Moreover, compared with the method of using a higher purification tower as a whole, this structural method of connecting multiple purification towers in series reduces the height of the purification tower while ensuring the flow of the filler, avoiding the defect that the filler below is easily crushed under gravity due to its excessive height, thereby blocking the pores of the filler and reducing the fluidity of the airflow.

[0070] The housing 1 is in a vertical cylindrical shape as a whole, so that the pressure at each position of the housing is uniform and stable, reducing the presence of stress concentration positions and wind dead angle positions, and better ensuring the smoothness and stability of the device operation.

[0071] In each purification tower, the outer filter baffle 2 is supported and fixed on the outer shell by means of horizontal connecting rods, and the inner filter baffle is supported and fixed on the outer filter baffle (not shown in the figure) by means of horizontal connecting rods. This facilitates fixed support.

[0072] In each purification tower, the air inlet 5 is connected to the gas chamber located on the outside, and the air outlet 6 is connected to the gas chamber located on the inside.

[0073] In this way, the connection and setting of the air inlet and outlet structures are simpler, and air inlet and outlet are more convenient.

[0074] Among them, in the purification tower, a ring-shaped air distribution chamber 26 is arranged around the outer periphery of the lower end of the shell, the air inlet 5 is arranged on one side of the air distribution chamber 26, and air holes with a diameter smaller than the filler particle size are evenly distributed on the side wall of the shell in the air distribution chamber.

[0075] In this way, even air intake can be achieved over the entire ring, avoiding imbalance caused by air intake in one direction.

[0076] A harmful component detection probe is also provided in the inner gas chamber and is connected to the control center (not shown).

[0077] In this way, the treatment effect of each purification tower can be better detected and fed back in real time to facilitate control.

[0078] The air filter baffle 2 is in the shape of a cylindrical plate as a whole, and is provided with a plurality of air holes with diameters smaller than the filler particle size, so that the structure of the air filter baffle is simpler and the equipment strength is more stable and reliable.

[0079] Among them, a supporting device is also arranged in the filling area, and the supporting device includes a supporting plate arranged horizontally along the annular direction of the filling area. The supporting plate is generally conical ring-shaped, and one side (inside or outside) of the supporting plate is connected to the side wall of the filling area, and the other side is suspended obliquely downward.

[0080] In this way, the setting of the support plate provides a certain support to the upper filler without affecting the downward flow of the filler, thereby preventing the filler at the bottom of the filler area from being crushed due to excessive pressure, affecting the reaction effect and gas outlet quality.

[0081] Among them, the supporting device includes a long supporting plate 7 (which is larger than the short supporting plate in the width direction) and a short supporting plate 8, which are respectively fixedly arranged on the side walls on both sides of the inner side of the filling area, and the suspended ends of the long supporting plate 7 and the short supporting plate 8 are respectively arranged in an oblique and staggered manner.

[0082] In this way, there are upward supporting force positions on the entire cross-section of the filler area, avoiding gaps and leaks, ensuring balanced and stable upward support, thus ensuring the uniformity of the downward flow of the filler and the stability of the desulfurization reaction.

[0083] Among them, multiple groups of supporting devices are arranged in the packing area along the height direction, so that the height of the packing area and the shell can be extended as much as possible, thereby improving the treatment effect.

[0084] Among them, in any two groups of supporting devices at adjacent positions, the positions of the long supporting plates 7 and the short supporting plates 8 are set to be opposite to each other. In this way, the overall balance of the supporting force during the downward flow of the filler is better ensured.

[0085] Among them, in the supporting device, the long supporting plate is located below the short supporting plate, and the long supporting plate is composed of a plurality of fan-shaped supporting plate blocks 9 evenly distributed in the circumferential direction. The upper end of the supporting plate block 9 is hingedly mounted on the side wall in the filling area, and the lower part of the supporting plate block 9 is supported and connected to the side wall in the corresponding filling area through a supporting spring 10.

[0086] This is because the gas treatment in this scheme is a dynamic process, and the gas flow rate may fluctuate. When the gas flow rate is large, the feeding speed of the filler can be adjusted accordingly to ensure the reaction treatment effect, but the fixed support plate will hinder the flow rate adjustment of the filler. Therefore, in this scheme, the long support plate is further set below the short support plate, and it is evenly broken along the circumference and set as a rotatable elastic support structure. In this way, when the downward flow rate of the filler accelerates, the support plate will automatically rotate downward due to the increased force, so that its own supporting force becomes smaller, and at the same time, the gap distance between the long support plate and the short support plate is automatically increased, which is more conducive to the downward flow of the filler and facilitates the adjustment and control of the filler flow rate to better ensure the treatment effect.

[0087] The support spring 10 is a coil spring made of shape memory alloy material.

[0088] This is because the reaction of coal gas in the packing channel is a dynamic process, coupled with the temperature of the coal gas itself and the heat released by the reaction, the temperature in the packing channel usually fluctuates within a temperature range (the reaction temperature range usually fluctuates around 100℃±50℃). A high temperature indicates a relatively violent reaction, and a low temperature indicates a relatively gentle reaction. Therefore, after the support spring is designed as a memory alloy material, in addition to its own spring function, it can adjust and increase the gap distance between the long support plate and the short support plate under stress, and it can also sense the temperature. When the temperature increases (indicating a violent reaction), it shrinks through its own deformation, actively drives the long support plate to rotate downward, increases the gap distance between the long support plate and the short support plate, reduces obstacles, and increases the rate of downward flow of the packing, achieving the effect of active adjustment.

[0089] The support spring 10 is formed by connecting multiple sections of different shape memory alloy materials in the length direction, the length of each section of the shape memory alloy material is gradually increased, and the deformation temperature of each section of the shape memory alloy material is gradually increased within the reaction temperature range of the filler area.

[0090] In this way, graded regulation can be achieved within the reaction fluctuation temperature range. The more intense the reaction and the higher the temperature, the greater the active contraction of the support spring, so that the downward flow rate of the filler more accurately matches the degree of filler reaction.

[0091] The upper end of the support plate block 9 is rotatably mounted in a mounting groove 11 on the inner side wall of the filler area, and a flexible sealing skin 12 is connected around the support plate block 9 and the corresponding inner side wall of the filler area.

[0092] In this way, a flexible seal is achieved on the inner side of the single support plate, preventing the upper hinge and the lower support spring from failing due to material inclusions, thereby ensuring the stability of the device operation.

[0093] Among them, the automatic feeding control device includes a feeding funnel 15 which is arranged at the center position above the shell 1 corresponding to the filling area position, and also includes a feeding container 16 which is connected and arranged between the feeding funnel 15 and the filling area 3, an upper feeding switch valve 17 is arranged between the feeding funnel 15 and the feeding container 16, and a lower feeding switch valve 18 is arranged between the feeding container 16 and the shell 1. A feeding gas replacement inlet 19 with a switch is also arranged on one side of the feeding container 16. The feeding gas replacement inlet 19 is connected to the safety gas source container through a safety gas access pipeline and an air pump (not shown), and a feeding gas replacement outlet 20 with a switch is correspondingly arranged on the other side of the feeding container.

[0094] In this way, when feeding, the filler is first introduced into the feeding funnel, the lower switch valve of the feeding is in a closed state, the upper switch valve of the feeding is opened, the filler is first allowed to enter the feeding container, and then the upper switch valve of the feeding is closed. At this time, the feed gas replacement inlet and the feed gas replacement outlet are first opened, and the safe gas is introduced into the feeding container to squeeze out the air in the gap of the filler and discharge it through the feed gas replacement outlet, and then the feed gas replacement inlet and the feed gas replacement outlet are closed. Then the lower switch valve of the feeding is opened, and the filler in the feeding container can flow downward into the filler area by its own weight, realizing the automatic downward flow and replenishment of the filler, and ensuring the mobile reaction treatment process. In this way, the oxygen component in the air can be prevented from entering the filler area together with the filler, causing deflagration during the reaction and damaging the equipment, thereby improving the safety of the equipment operation.

[0095] The safety gas is nitrogen, which has the advantages of low cost and good safety. Of course, other gases that do not react with coal gas, such as inert gas or carbon dioxide, can also be used in implementation.

[0096] Among them, an oxygen sensor is also provided at the feed gas replacement outlet 20 and is connected to the control center (not shown).

[0097] In this way, the oxygen sensor can detect the oxygen content at the displacement outlet. When the oxygen content is lower than a preset threshold (e.g., 0.5%), it can be determined that the air has been exhausted, which is convenient for accurate control and execution of subsequent operations. During implementation, the control center can be connected to and controlled by the upper feed switch valve, the lower feed switch valve, the feed gas displacement inlet, the switch at the feed gas displacement inlet, and the air pump, so that the above detection and control process can be automated.

[0098] The feed gas replacement outlet 20 is also provided with a carbon monoxide sensor connected to a control center (not shown).

[0099] In this way, when all the fillers in the feed container are fed, before the next feeding, the lower feed switch valve can be closed first, the upper feed switch valve can be kept in a closed state, and then the feed gas replacement inlet and feed gas replacement outlet are opened, and the safety gas is introduced into the feed container, and the coal gas overflowing from the filler area inside the shell into the feed container is squeezed out and discharged through the feed gas replacement outlet. When the carbon monoxide sensor detects that the carbon monoxide concentration at the feed gas replacement outlet is lower than the preset value (for example, 0.5%), it can be determined that the coal gas has been discharged. At this time, the feed gas replacement inlet and feed gas replacement outlet can be closed, waiting for the next feeding. In this way, it is possible to well avoid the coal gas in the filler area inside the shell from overflowing during feeding to cause a safety accident.

[0100] The feed upper switch valve 17 comprises two switch valves 17 which are connected in series and arranged in parallel, including a non-sealed switch valve located at the upper part and a sealed switch valve located at the lower part.

[0101] In this way, after the filler enters the feed container from the feed funnel, when closing the upper switch valve of the feed, the non-sealed switch valve can be closed first to quickly cut off the flow of the filler, and then the sealed switch valve can be closed. At the same time, when opening the upper switch valve, the sealed switch valve can be opened first, and then the non-sealed switch valve can be opened. In this way, it can be ensured that the sealed switch valve is not affected by the filler when closing and opening, so that it does not contact the filler as much as possible, and the sealing effect and durability are better guaranteed. During implementation, the non-sealed switch valve located at the top can be a plug valve or a butterfly valve, which is sensitive, fast and low-cost, and the sealed switch valve located at the bottom can be a ball valve or a blind plate valve to ensure a good sealing effect.

[0102] The feed lower switch valve 18 comprises two valves which are connected in series and arranged in parallel, including a flow regulating switch valve located at the upper part and a sealing switch valve located at the lower part.

[0103] In this way, when the feed container feeds into the packing area, the flow regulating switch valve can be used to adjust the speed of the feed to match the gas flow, ensuring that the reaction treatment effect can be ensured even when the gas flow fluctuates. At the same time, when sealing is required, the sealing switch valve can be used to achieve sealing and minimize contact with the packing, thereby better ensuring the sealing effect and durability.

[0104] In addition, during implementation, a feed retention container can be further connected in series between the lower part of the feed container and the outer shell to communicate with the filler area. This is because the structure and function of the above-mentioned feeding device is to realize batch feeding to remove oxygen mixed in the feed and ensure the sealing effect of the feed. Therefore, after adding another feed retention container, the filler first enters the feed retention container and accumulates, and the feed retention container can be used to realize uninterrupted continuous feeding inside the filler channel to avoid the impact of feeding stopping on the reaction during the air removal process. Among them, a flow regulating valve is set between the feed retention container and the outer shell and connected to the control center, so that the feed flow rate can be controlled as needed.

[0105] Among them, the discharging device includes a discharging container 21 which is connected to the filling area and is arranged in the middle position below the shell. The lower end of the discharging container 21 is downwardly provided with a discharging port, an upper discharging switch valve 22 is provided between the discharging container 21 and the shell, and a lower discharging switch valve 23 is provided between the discharging container 21 and the discharging port. A discharging gas replacement inlet 24 equipped with a switch is also provided on one side of the discharging container 21. The discharging gas replacement inlet 24 is connected to the safety gas source container through a safety gas access pipeline and an air pump (not shown), and a discharging gas replacement outlet 25 equipped with a switch is correspondingly provided on the other side of the discharging container 21.

[0106] In this way, during discharging, the lower discharging switch valve is in a closed state, and the upper discharging switch valve is opened, so that the reacted filler enters the discharging container first. When the accumulated filler in the discharging container is almost full, close the upper discharging switch valve, and then open the discharging gas replacement inlet and the discharging gas replacement outlet first, and introduce safety gas into the discharging container to squeeze out the coal gas mixed in the gap of the filler and discharge it through the discharging gas replacement outlet. Then close the discharging gas replacement inlet and the discharging gas replacement outlet. Then open the lower discharging switch valve, and the filler in the discharging container can flow out of the device downward by its own weight to achieve discharging. In this way, the leakage of coal gas mixed in the outflowing filler can be avoided, and the safety of equipment operation is improved.

[0107] The safety gas is nitrogen, which has the advantages of low cost and good safety. Of course, other gases that do not react with coal gas, such as inert gas or carbon dioxide, can also be used in implementation.

[0108] A carbon monoxide sensor is also provided at the gas replacement outlet 25 for discharging and is connected to the control center (not shown).

[0109] In this way, the carbon monoxide concentration at the outlet of the gas replacement for discharging can be detected by the carbon monoxide sensor. When the concentration is lower than the preset value (for example, 0.5%), it can be determined that the gas in the discharging container has been completely replaced and discharged, which is convenient for accurate control and execution of subsequent operations. Among them, the control center can be connected and controlled with the upper discharging switch valve, the lower discharging switch valve, the gas replacement inlet for discharging, the switch at the gas replacement inlet for discharging, and the air pump, so that the above detection and control process can be automated.

[0110] Among them, an oxygen sensor is also provided at the position of the gas replacement outlet 25 for discharging and is connected to the control center (not shown).

[0111] In this way, after the filling material in the discharge container is discharged, before the next discharge, the lower discharge switch valve can be closed first, and the upper discharge switch valve can be kept in a closed state. Then open the discharge gas replacement inlet and the discharge gas replacement outlet, and introduce safe gas into the discharge container to squeeze out the air inside and discharge it through the discharge gas replacement outlet. When exhausting, the exhaust effect is detected by the oxygen sensor. When the oxygen content is lower than the preset threshold (for example, 0.5%), it can be judged that the air has been exhausted, which is convenient for precise control and execution of subsequent operations. In this way, it is avoided that the air enters the filling area in the shell from the discharge device during the next discharge, causing explosion during the reaction and damaging the equipment, thereby improving the safety of equipment operation.

[0112] The discharge upper switch valve 22 comprises two switch valves 22 which are connected in series and arranged in parallel, including a flow regulating switch valve located at the top and a sealing switch valve located at the bottom.

[0113] In this way, the flow regulating switch valve can be used to adjust the size of the discharge speed from the packing area to the discharge container, so that it matches the flow speed of the packing in the packing area, ensures that the flow speed of the packing matches the gas flow rate, and ensures the reaction effect. At the same time, when the packing enters the discharge container, when closing the discharge switch valve, the flow regulating switch valve can be closed first to quickly cut off the flow of the packing, and then the sealing switch valve is closed. When the subsequent discharge is opened, the sealing switch valve is opened first and then the flow regulating switch valve is opened. In this way, it can be ensured that the sealing switch valve is not affected by the flow of the packing when closing and opening, so that it is not in contact with the packing as much as possible, and the sealing effect and durability are better guaranteed. During implementation, the non-sealed switch valve located above can be a plug valve or a butterfly valve, which is sensitive, fast and low-cost, and the sealed switch valve located below can be a ball valve or a blind plate valve to ensure a good sealing effect.

[0114] The discharge lower switch valve 23 comprises two switch valves 23 which are connected in series and arranged in parallel, including a non-sealed switch valve located at the upper part and a sealed switch valve located at the lower part.

[0115] In this way, when the switch valve is opened at the discharge, the sealed switch valve is opened first and then the non-sealed switch valve is opened, and when the switch valve is closed at the discharge, the non-sealed switch valve is closed first and then the sealed switch valve. In this way, the feed of the sealed switch valve does not contact the packing, ensuring that the opening and closing of the sealed switch valve is not affected by the flow of the packing, and ensuring the reliability and durability of its sealing.

[0116] In addition, during implementation, a discharge retention container can be further connected in series between the upper part of the discharge container and the outer shell to communicate with the filler area. This is because the structure and function of the above-mentioned discharge device is to achieve batch discharge to remove the coal gas mixed in the discharge and ensure the sealing effect of the discharge. Therefore, after adding another discharge retention container, the filler will first enter the discharge retention container and accumulate when discharging. The discharge retention container can realize uninterrupted continuous discharge inside the filler channel, avoiding the impact of discharge stopping on the reaction during the process of removing the coal gas mixed in the discharge. Among them, a flow regulating valve is set between the discharge retention container and the outer shell and connected to the control center, so that the discharge flow rate can be controlled according to needs.

[0117] Among them, a material receiving container is provided at the outlet of the discharge device at the lower end of the purification tower located in front of the airflow, and the material receiving container is connected to the feed funnel of the feed device above the next purification tower in the opposite direction of the airflow through a filler conveying device (not shown).

[0118] In this way, the packing of each purification tower is directly connected in series along the direction of counter-flow by the packing conveying mechanism, realizing the aforementioned processing method of counter-flow control of the overall operation of the packing and the direction of the airflow. The utilization rate of the packing is guaranteed and the inconvenience of manual handling is avoided. During implementation, the packing conveying mechanism can be implemented by existing conveying devices such as chain hook machine or screw conveyor.

[0119] During implementation, this series radial flow blast furnace gas purification system can be set up in three sets, see Figure 5 In the figure, the three systems are distinguished by dotted boxes. The filler in the first set uses hydrogen chloride adsorbent filler to form a dechlorination (i.e., deacidification) purification unit, the filler in the second set uses carbonyl sulfide hydrolysis catalyst filler to form a hydrolysis purification unit, and the filler in the third set uses desulfurization adsorbent filler to form a desulfurization purification unit. The gas outlet end of the dechlorination purification unit is connected to the gas inlet end of the hydrolysis purification unit, and then the gas outlet end of the hydrolysis purification unit is connected to the gas inlet end of the desulfurization purification unit.

[0120] In this way, three sets of equipment are used in series, and different fillers are used to react and treat the coal gas, so that the fine desulfurization process of the coal gas can be achieved.

[0121] Therefore, this solution is used for the desulfurization of coal gas and can realize the fine desulfurization process. In principle, the solution eliminates the problems of deflagration and pollutant leakage during the loading / discharging of materials (catalysts / adsorbents), greatly improves the overall operation safety, and significantly improves the purification efficiency of pollutants. In addition, this solution realizes the automatic replacement of materials, and can adjust the flow of fillers according to the corresponding gas flow to match it, ensuring the reaction effect and utilization efficiency of the fillers, avoiding waste, and ensuring that the gas purification is in a high-efficiency and stable operation state for a long time.

Claims

1. A series radial flow blast furnace gas purification system, characterized in that: The invention comprises a plurality of radial flow purification towers arranged in parallel, wherein the radial flow purification tower comprises a vertically arranged outer shell, wherein two inner and outer layers of cylindrical air filter baffles are coaxially spaced apart in the outer shell, a filling area is formed between the two layers of air filter baffles, a gas chamber is formed inside the inner layer of the air filter baffle and outside the outer layer of the air filter baffle respectively, a feeding device is arranged at the upper end of the outer shell and is communicated with the filling area, a discharging device is arranged at the lower end of the outer shell and is communicated with the filling area, an air inlet is arranged on one side of the lower end of the outer shell and is communicated with a gas chamber, an air outlet is arranged on the other side of the upper end and is communicated with another gas chamber, and the air outlet of the upper purification tower is connected to the air inlet of the adjacent next purification tower through a pipeline.

2. The series radial flow blast furnace gas purification system according to claim 1, characterized in that: In each purification tower, the outer air filter baffle is supported and fixed on the outer shell by means of horizontal connecting rods, and the inner air filter baffle is supported and fixed on the outer air filter baffle by means of horizontal connecting rods.

3. The series radial flow blast furnace gas purification system according to claim 2, characterized in that: In each purification tower, the air inlet is connected to the gas chamber located on the outside, and the air outlet is connected to the gas chamber located on the inside.

4. The series radial flow blast furnace gas purification system according to claim 3, characterized in that: A harmful component detection probe is also provided in the inner gas chamber and is connected to the control center; The air filter baffle is in the shape of a cylindrical plate as a whole, and is provided with a plurality of air holes with diameters smaller than the particle size of the filler.

5. The series radial flow blast furnace gas purification system according to claim 1, characterized in that: A supporting device is also provided in the packing area, and the supporting device includes a supporting plate horizontally arranged along the circumference of the packing area, and the supporting plate is in a cone-shaped ring shape as a whole, one side of the supporting plate is connected to the side wall of the packing area, and the other side is suspended obliquely downward; The supporting device includes a long supporting plate and a short supporting plate respectively fixedly arranged on the side walls on both sides of the inner side of the filling area, and the suspended ends of the long supporting plate and the short supporting plate are respectively arranged at an oblique and staggered interval relative to each other; Multiple groups of supporting devices are arranged in the packing area along the height direction; In any two sets of supporting devices at adjacent upper and lower positions, the positions of the long supporting plates and the short supporting plates are set to be opposite to each other on the left and right sides; In the supporting device, the long supporting plate is located below the short supporting plate. The long supporting plate is composed of a plurality of fan-shaped supporting plate single blocks evenly distributed in the circumferential direction. The upper end of the supporting plate single block is hingedly mounted on the side wall in the filling area, and the lower part of the supporting plate single block is supported and connected to the side wall in the corresponding filling area through a supporting spring.

6. The series radial flow blast furnace gas purification system according to claim 1, characterized in that: The feeding device comprises a feeding funnel arranged at the center position above the shell corresponding to the filling area position, and also comprises a feeding container connected between the feeding funnel and the filling area, an upper feeding switch valve is arranged between the feeding funnel and the feeding container, a lower feeding switch valve is arranged between the feeding container and the shell, a feeding gas replacement inlet equipped with a switch is also arranged on one side of the feeding container, the feeding gas replacement inlet is connected to the safety gas source container through a safety gas access pipeline and an air pump, and a feeding gas replacement outlet equipped with a switch is correspondingly arranged on the other side of the feeding container; An oxygen sensor is also provided at the outlet of the feed gas replacement and is connected to the control center; A carbon monoxide sensor is also designed at the outlet of the feed gas replacement and is connected to the control center; The feed upper switch valve comprises two upper and lower switch valves connected in series and arranged in parallel, including a non-sealed switch valve located at the upper side and a sealed switch valve located at the lower side; The feed lower switch valve comprises two valves which are connected in series and arranged in parallel, including a flow regulating switch valve located at the upper part and a sealing switch valve located at the lower part.

7. The series radial flow blast furnace gas purification system according to claim 1, characterized in that: The discharging device comprises a discharging container which is connected to the filling area and is arranged at the center position below the shell. A discharging port is arranged downward at the lower end of the discharging container. An upper discharging switch valve is arranged between the discharging container and the shell. A lower discharging switch valve is arranged between the discharging container and the discharging port. A discharging gas replacement inlet with a switch is also arranged on one side of the discharging container. The discharging gas replacement inlet is connected to the safety gas source container through a safety gas access pipeline and an air pump. A discharging gas replacement outlet with a switch is correspondingly arranged on the other side of the discharging container.

8. The series radial flow blast furnace gas purification system according to claim 7, characterized in that: A carbon monoxide sensor is also provided at the outlet for gas replacement of the discharging material and is connected to the control center; An oxygen sensor is also provided at the outlet for gas replacement of the discharging material and is connected to the control center; The discharge upper switch valve comprises two switch valves which are connected in series and arranged in parallel, including a flow regulating switch valve located at the upper part and a sealing switch valve located at the lower part.

9. The series radial flow blast furnace gas purification system according to claim 7, characterized in that: The discharge lower switch valve comprises two switch valves which are connected in series and arranged in parallel, including a non-sealed switch valve located at the upper part and a sealed switch valve located at the lower part.

10. The series radial flow blast furnace gas purification system according to claim 1, characterized in that: A material receiving container is provided at the outlet of the discharging device at the lower end of the purification tower located in front of the airflow, and the material receiving container is connected to the feeding device above the next purification tower in the opposite direction of the airflow through the filler conveying device.

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