A series countercurrent blast furnace gas purification system

Abstract

The utility model discloses a series countercurrent blast furnace gas purification treatment system, characterized in that it comprises a plurality of countercurrent purification towers arranged in parallel, the countercurrent purification towers comprise and a vertically arranged shell, a packing area is formed inside the shell, a feeding device is arranged at the upper end of the shell, a discharging device is arranged at the lower end of the shell, an air inlet is arranged on one side of the lower end of the shell, and an air outlet is arranged on the other side of the upper end, and the air outlet of the previous purification tower is connected to the air inlet of the adjacent next purification tower through a pipeline. 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.

Description

Technical Field

[0001] The utility model relates to the technical field of blast furnace gas purification and treatment, in particular to a series countercurrent 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 countercurrent blast furnace gas purification treatment system with a simple structure, higher filler utilization efficiency, higher desulfurization efficiency, better effect, 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 countercurrent blast furnace gas purification and treatment system is characterized in that it includes a plurality of countercurrent purification towers arranged in parallel, the countercurrent purification towers include a vertically arranged outer shell, a filling area is formed inside the outer shell, a feeding device is arranged at the upper end of the outer shell, a discharging device is arranged at the lower end of the outer shell, an air inlet is arranged on one side of the lower end of the outer shell, and an air outlet is arranged on the other side of the upper end, and the air outlet of the previous purification tower is connected to the air inlet of the adjacent subsequent purification tower through a pipeline.

[0008] In this way, when the equipment is running, the coal gas to be purified enters the equipment housing from the air inlet at the lower end of the first countercurrent purification tower in the forward direction of the airflow, flows vertically upward along its inner cavity, and the filling in the purification tower is controlled by the feeding device to feed and the discharging device to control the discharging to realize the downward flow control of the filling in the inner cavity, realize the countercurrent counter-contact contact between the filling and the coal gas, improve the reaction purification effect, and facilitate the online replacement of the filling. At the same time, since each purification tower is independently set, and a discharging device is set at the lower end of each purification tower, the filling in the purification tower located in front of the airflow in the equipment can be controlled to be sent to the rear filling tower for processing in sequence after discharging, so as to realize the processing method of the overall operation of the filling and the countercurrent control of the airflow direction. This countercurrent control processing method maximizes the efficiency and effect of the filling reaction and avoids the waste of filling. Moreover, compared with the method of using a higher purification tower as a whole, the structural method of multiple purification towers in series reduces the height of the purification tower while ensuring the flow of the filling, and avoids the defect that the filling below is crushed under gravity due to the large height of the purification tower, thereby blocking the filling pores and reducing the flow of the airflow. At the same time, the device structure has the advantages of simple implementation and low cost.

[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 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.

[0011] In this way, uniform air intake can be achieved over the entire ring shape, so that the gas can flow upward more evenly along the circumferential direction after entering the filler area, thus avoiding imbalance caused by air intake in one direction.

[0012] Furthermore, the air intake structure of the purification tower can be improved as follows: a plurality of horizontal circular air distribution boxes are arranged in the filler area horizontally opposite to the air distribution chamber, and the air distribution boxes are arranged in a circular array coaxial with the purification tower. The upper end of each air distribution box is an upward cone, and air holes with a diameter smaller than the filler particle size are evenly distributed on the air distribution box. The air distribution boxes and the air distribution boxes and the air distribution chamber are fixedly supported and connected to each other through horizontally arranged connecting pipes.

[0013] In this way, it is easier for the air to enter the internal space of the packing area evenly and flow upward, avoiding the defect of air intake from the peripheral position of the packing area, resulting in a small airflow in the center, which affects the reaction. In this way, after the uniform air intake and distribution at the lower end of the packing area is achieved without affecting the downward movement of the packing, the diameter of the purification tower can be expanded as much as possible, so that the height of the purification tower can be reduced while ensuring the reaction treatment effect, avoiding the packing area being too high to crush the packing in the lower area due to the need to ensure the treatment effect.

[0014] Furthermore, in the purification tower, a ring-shaped gas collecting chamber is arranged around the outer periphery of the upper end of the shell, the gas outlet is arranged on one side of the gas collecting 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 gas collecting chamber.

[0015] In this way, uniform gas discharge can be achieved on the entire ring, so that the gas can flow out of the packing area more evenly along the ring, avoiding imbalance caused by gas discharge in one direction.

[0016] Furthermore, a harmful component detection probe connected to the control center is also arranged in the gas collecting chamber.

[0017] In this way, the treatment effect of each purification tower can be better detected and fed back in real time to facilitate control.

[0018] 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.

[0019] 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.

[0020] 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.

[0021] Furthermore, an oxygen sensor is provided at the outlet of the feed gas replacement and is connected to the control center.

[0022] 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.

[0023] Furthermore, a carbon monoxide sensor is designed at the outlet of the feed gas replacement outlet and is connected to the control center.

[0024] 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.

[0025] 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.

[0026] 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.

[0027] 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.

[0028] 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.

[0029] 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.

[0030] 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.

[0031] 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.

[0032] 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.

[0033] Furthermore, a carbon monoxide sensor is provided at the outlet for gas replacement of the discharging material and is connected to the control center.

[0034] 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.

[0035] Furthermore, an oxygen sensor connected to the control center is also provided at the outlet position for gas replacement of the discharging material.

[0036] In this way, after the inactivated filler 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 an 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 filler 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.

[0037] 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.

[0038] 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 deactivated 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.

[0039] 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.

[0040] 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.

[0041] 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 deactivated filler will first enter the discharge retention container and accumulate when discharged. The discharge retention container can realize uninterrupted continuous discharge of the filling 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.

[0042] 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.

[0043] 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.

[0044] During implementation, the series countercurrent 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.

[0045] 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.

[0046] 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.

[0047] 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

[0048] Figure 1 The schematic diagram of the structure of the series countercurrent 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.

[0049] Figure 2 for Figure 1 Schematic diagram of the structure of a single purification tower.

[0050] Figure 3 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

[0051] The utility model is further described in detail below in conjunction with specific implementation methods.

[0052] Best embodiment: A series countercurrent blast furnace gas purification system, characterized in that, see Figure 1-Figure 2 , including a plurality of countercurrent purification towers arranged in parallel, the countercurrent purification tower includes a vertically arranged shell 1, a packing area is formed inside the shell, a feeding device is arranged at the upper end of the shell 1, a discharging device is arranged at the lower end of the shell, an air inlet 2 is arranged on one side of the lower end of the shell, and an air outlet 3 is arranged on the other side of the upper end, and the air outlet of the previous purification tower is connected to the air inlet of the adjacent subsequent purification tower through a pipeline.

[0053] In this way, when the equipment is running, the coal gas to be purified enters the equipment housing from the air inlet at the lower end of the first countercurrent purification tower in the forward direction of the airflow, flows vertically upward along its inner cavity, and the filling in the purification tower is controlled by the feeding device to feed and the discharging device to control the discharging to realize the downward flow control of the filling in the inner cavity, realize the countercurrent counter-contact contact between the filling and the coal gas, improve the reaction purification effect, and facilitate the online replacement of the filling. At the same time, since each purification tower is independently set, and a discharging device is set at the lower end of each purification tower, the filling in the purification tower located in front of the airflow in the equipment can be controlled to be sent to the rear filling tower for processing in sequence after discharging, so as to realize the processing method of the overall operation of the filling and the countercurrent control of the airflow direction. This countercurrent control processing method maximizes the efficiency and effect of the filling reaction and avoids the waste of filling. Moreover, compared with the method of using a higher purification tower as a whole, the structural method of multiple purification towers in series reduces the height of the purification tower while ensuring the flow of the filling, and avoids the defect that the filling below is crushed under gravity due to the large height of the purification tower, thereby blocking the filling pores and reducing the flow of the airflow.

[0054] 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.

[0055] Among them, in the purification tower, a ring-shaped air distribution chamber 4 is arranged around the outer periphery of the lower end of the outer shell 1, the air inlet 2 is arranged on one side of the air distribution chamber 4, and air holes with a diameter smaller than the filler particle size are evenly distributed on the side wall of the outer shell in the air distribution chamber 4.

[0056] In this way, uniform air intake can be achieved over the entire ring shape, so that the gas can flow upward more evenly along the circumferential direction after entering the filler area, thus avoiding imbalance caused by air intake in one direction.

[0057] During implementation, the air intake structure of the purification tower can also be improved as follows, see Figure 2A plurality of horizontal circular air distribution boxes 5 are arranged in the filler area horizontally opposite to the air distribution chamber 4. The air distribution boxes 5 are arranged in a circular array coaxial with the purification tower. The upper end of each air distribution box 5 is an upward cone. Air holes with a diameter smaller than the filler particle size are evenly distributed on the air distribution box 5. The air distribution boxes 5 and the air distribution boxes 5 and the air distribution chamber 4 are fixedly supported and connected to each other through horizontally arranged connecting pipes.

[0058] In this way, it is easier for the air to enter the internal space of the packing area evenly and flow upward, avoiding the defect that the air is drawn from the periphery of the packing area, resulting in a smaller airflow in the center that affects the reaction. In this way, after the uniform air flow distribution at the lower end of the packing area is achieved without affecting the downward movement of the packing, the diameter of the purification tower can be expanded and increased, so that the height of the purification tower can be reduced while ensuring the reaction treatment effect, avoiding the packing area being too high to crush the packing in the lower area due to the need to ensure the treatment effect.

[0059] Among them, in the purification tower, a ring-shaped gas collecting chamber 6 is arranged around the outer periphery of the upper end of the shell 1, and the gas outlet 3 is arranged on one side of the gas collecting chamber 6. The side wall of the shell in the gas collecting chamber is evenly distributed with air holes with a diameter smaller than the filler particle size.

[0060] In this way, uniform gas discharge can be achieved on the entire ring, so that the gas can flow out of the packing area more evenly along the ring, avoiding imbalance caused by gas discharge in one direction.

[0061] Among them, a harmful component detection probe is also arranged in the gas collecting chamber 6 and is connected to the control center (not shown in the figure).

[0062] In this way, the treatment effect of each purification tower can be better detected and fed back in real time to facilitate control.

[0063] Among them, the automatic feeding control device includes a feeding funnel 7 which is arranged at the center position above the shell 1 corresponding to the filling area position, and also includes a feeding container 8 which is connected and arranged between the feeding funnel 7 and the filling area, an upper feeding switch valve 9 is arranged between the feeding funnel 7 and the feeding container 8, and a lower feeding switch valve 10 is arranged between the feeding container and the shell. A feeding gas replacement inlet 11 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 (not shown in the figure), and a feeding gas replacement outlet 12 with a switch is correspondingly arranged on the other side of the feeding container.

[0064] 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.

[0065] 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.

[0066] Among them, an oxygen sensor is also provided at the feed gas replacement outlet 12 and is connected to the control center (not shown).

[0067] 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.

[0068] The feed gas replacement outlet 12 is also provided with a carbon monoxide sensor connected to a control center (not shown).

[0069] 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.

[0070] The feed upper switch valve 9 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.

[0071] 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.

[0072] The feed lower switch valve 10 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.

[0073] 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.

[0074] In addition, during implementation, a feed retention container 13 can be further connected in series between the lower part of the feed container 8 and the outer shell 1 and connected to 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 14 is set between the feed retention container 13 and the outer shell 1 and is connected to the control center, so that the feed flow rate can be controlled as needed.

[0075] Among them, the discharging device includes a discharging container 15 which is connected to the filling area and is arranged in the middle position below the shell. The lower end of the discharging container 15 is downwardly provided with a discharging port, an upper discharging switch valve 16 is provided between the discharging container 15 and the shell 1, and a lower discharging switch valve 17 is provided between the discharging container 15 and the discharging port. A discharging gas replacement inlet 18 equipped with a switch is also provided on one side of the discharging container 15. The discharging gas replacement inlet 18 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 19 equipped with a switch is correspondingly provided on the other side of the discharging container 15.

[0076] 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.

[0077] 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.

[0078] Among them, a carbon monoxide sensor is also provided at the position of the gas replacement outlet 19 for discharging and is connected to the control center (not shown).

[0079] 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.

[0080] Among them, an oxygen sensor is also provided at the position of the gas replacement outlet 19 for discharging and is connected to the control center (not shown).

[0081] In this way, after the inactivated filler 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 an 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 filler 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.

[0082] The discharge upper switch valve 16 comprises two switch valves 16 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.

[0083] 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 deactivated 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 can be 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.

[0084] The discharge lower 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.

[0085] 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.

[0086] In addition, during implementation, a discharge retention container 20 can be further connected in series between the upper portion of the discharge container 15 and the outer shell 1 and connected to 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 inactivated filler will first enter the discharge retention container and accumulate when discharged. 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 21 is set between the discharge retention container 20 and the outer shell and connected to the control center, so that the discharge flow rate can be controlled according to needs.

[0087] 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).

[0088] 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.

[0089] When implementing, see Figure 3 This series countercurrent blast furnace gas purification system can be set up in three sets. Figure 3 Each set of equipment includes three purification towers and is represented by dotted lines. 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.

[0090] 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.

[0091] 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 countercurrent blast furnace gas purification system, characterized in that: The invention comprises a plurality of countercurrent purification towers arranged in parallel, wherein the countercurrent purification tower comprises a vertically arranged outer shell, a filling area is formed inside the outer shell, a feeding device is arranged at the upper end of the outer shell, a discharging device is arranged at the lower end of the outer shell, an air inlet is arranged on one side of the lower end of the outer shell, and an air outlet is arranged on the other side of the upper end, and the air outlet of the previous purification tower is connected to the air inlet of the adjacent subsequent purification tower through a pipeline.

2. The series countercurrent blast furnace gas purification system according to claim 1, characterized in that: In the purification tower, an annular air distribution chamber is arranged around 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.

3. The series countercurrent blast furnace gas purification system according to claim 1, characterized in that: An annular gas collecting chamber is arranged around the outer periphery of the upper end of the shell, the gas outlet is arranged on one side of the gas collecting chamber, and air holes with diameters smaller than the filler particle size are evenly distributed on the side wall of the shell in the gas collecting chamber.

4. The series countercurrent blast furnace gas purification system according to claim 3, characterized in that: A harmful component detection probe is also arranged in the gas collecting chamber and is connected to the control center.

5. The series countercurrent blast furnace gas purification system according to claim 1, characterized in that: The feeding 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, and a lower feeding switch valve is arranged between the feeding container and the shell. A feeding gas replacement inlet 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 with a switch is correspondingly arranged on the other side of the feeding container.

6. The series countercurrent blast furnace gas purification system according to claim 5, characterized in that: The safety gas is nitrogen; 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 countercurrent 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 countercurrent blast furnace gas purification system according to claim 7, characterized in that: The safety gas is nitrogen; 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 countercurrent 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 countercurrent 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.

Images