A gas purification tower with automatic discharge

Abstract

The invention discloses a gas purification tower with automatic discharging, the tower body is composed of an air outlet chamber, a desulfurizing agent chamber, an air inlet chamber and a discharging bin from top to bottom, the air outlet chamber and the desulfurizing agent chamber are located in the same cavity, the gas outlet chamber is located at the side of the air outlet chamber, the desulfurizing agent inlet is located at the top of the air outlet chamber, a partition is arranged between the desulfurizing agent chamber and the air inlet chamber, the gas inlet is arranged at the side of the air inlet chamber, an air inlet grille fixed on the partition and connected with the desulfurizing agent chamber is arranged in the air inlet chamber, the air inlet grille comprises an outer cylinder body and an inner cylinder body, the outer cylinder body comprises an upper cylinder, a middle cylinder and a bottom cone which are connected together from top to bottom in sequence, the top of the upper cylinder is an open structure, louvers which are arranged at intervals up and down are arranged on the circumference of the middle cylinder, the bottom of each louver is inclined toward the inner cylinder body, the bottom cone is larger at the top and smaller at the bottom and has an opening at the bottom, a discharging pipe is connected to the opening, the upper and lower ends of the inner cylinder body are both closed structures, and a breathable net is arranged in the middle and upper part of the side of the inner cylinder body; the discharging pipe is connected to a discharging mechanism which discharges materials into the discharging bin.

Description

Technical Field

[0001] The invention relates to a coal gas purification tower with automatic material discharge, belonging to the technical field of coal gas processing equipment. Background Art

[0002] At present, coal gas purification in steel enterprises is the development direction for treating unorganized emissions of waste gas in the steel industry. Various coal gas purification technologies have also become hot spots for research and application. The common coal gas purification process is pretreatment + hydrolysis + dry desulfurization process, which is widely used and has good effects. The coal gas purification tower is a key equipment in the process of coal gas dry desulfurization. The existing coal gas purification tower adopts a fixed bed structure, which has many problems in operation and needs further optimization and improvement.

[0003] The main types of gas in steel enterprises include blast furnace gas and coke oven gas. Blast furnace gas contains a large amount of CO, and coke oven gas also contains a large amount of H2, CH4 and other gas components. It is a toxic, flammable and explosive gas fuel. Once leaked, it is easy to cause serious accidents. Therefore, the gas purification tower has very high requirements for leakage prevention. Conventional closed feeding and discharging equipment is difficult to achieve reliable sealing. The gas purification tower in the existing technology adopts a fixed bed structure. The material in the tower is filled once and replaced after failure.

[0004] The materials in the gas purification tower with a fixed bed structure do not flow for a long time. In addition, the accumulation of desulfurization reaction products, moisture, and dust will cause the materials in the tower to easily agglomerate, and the operating resistance will gradually increase. The poor air permeability of the materials will lose the desulfurization effect and become ineffective materials. At the same time, due to the influence of agglomeration, the operating resistance of the gas purification tower increases, and the airflow distribution becomes worse. After a certain stage, it must be shut down for treatment. Since the fixed bed purification tower has no discharge structure, as time goes by, the materials in the tower will gradually become ineffective along the direction of the airflow. When the purification effect of the gas purification tower cannot meet the requirements, the existing technology is to replace the materials in the tower as a whole, but at this time, there is still a considerable part of the materials downstream of the airflow direction in the tower that have purification performance. The overall replacement causes huge waste, and the partial replacement consumes a lot of manpower and working hours. It is also difficult to ensure the uniformity of the unloading of the materials in the purification tower bed layer, and the operation rate of the gas purification tower is low. Affected by the above factors, the resistance of the fixed bed purification tower in the existing technology is easy to increase, the operating cost is high, and it is difficult to achieve long-term stable operation. Summary of the invention

[0005] The object of the present invention is to provide a gas purification tower with automatic discharge, so as to solve the technical problem that the resistance of the fixed bed gas purification tower in the prior art tends to increase, resulting in a short operation cycle.

[0006] The present invention adopts the following technical scheme: a gas purification tower with automatic discharge, which comprises a tower body, a desulfurizer is installed in the tower body, a gas outlet and a gas inlet are respectively arranged at the top and bottom of the tower body, a desulfurizer inlet is arranged at the top of the tower body, and a desulfurizer outlet is arranged at the bottom of the tower body. The tower body is provided with an air outlet chamber, a desulfurizer chamber, an air inlet chamber and a discharge bin from top to bottom, the air outlet chamber and the desulfurizer chamber are located in the same cavity, the gas outlet is located on the side of the air outlet chamber, the desulfurizer inlet is located at the top of the air outlet chamber, a partition is arranged between the desulfurizer chamber and the air inlet chamber, the gas inlet is arranged on the side of the air inlet chamber, an air inlet grille fixed on the partition and connected to the desulfurizer chamber is arranged in the air inlet chamber, and the air inlet grille comprises an outer cylinder body and a gas outlet chamber located in the outer cylinder body. The inner cylinder body is an inner cylinder body inside the body, and the outer cylinder body includes an upper cylinder, a middle cylinder and a bottom cone which are connected together from top to bottom in sequence. The top of the upper cylinder is an open structure, and louvers are arranged at intervals up and down on the circumference of the middle cylinder. The bottom of each louver is inclined toward the inner cylinder body. The bottom cone adopts a structure that is larger at the top and smaller at the bottom and has an opening at the bottom. A discharge pipe is connected to the opening at the lower part of the bottom cone. The upper and lower ends of the inner cylinder body are both closed structures. The upper part of the inner cylinder body is a conical structure with the tip facing upward. The upper part and side of the inner cylinder body are respectively provided with air permeable nets, and the mesh diameter of the air permeable net is smaller than the diameter of the desulfurizer particles. A connecting rib plate is fixedly connected between the inner cylinder body and the outer cylinder body; the air inlet chamber is connected to the discharge bin, and the discharge pipe is connected to a discharge mechanism for discharging material into the discharge bin.

[0007] A support frame fixed to the tower body is provided between the air inlet chamber and the discharge bin, and the support frame is located below the air inlet grille. The unloading mechanism includes an upper valve plate and a lower valve plate spaced apart from each other and a driving mechanism. The upper valve plate and the lower valve plate are both slidably mounted on the support frame, and one end of the upper valve plate and the lower valve plate are connected by a connecting seat. A connecting pipe for connecting the inside and outside of the tower body is provided on the wall of the tower body near the connecting seat. The main body of the driving mechanism is installed at the position of the connecting pipe outside the tower body and is sealed with the connecting pipe. The driving end of the driving mechanism passes through the connecting pipe and is connected to the connecting seat. When the driving end is actuated, it drives the upper valve plate and the lower valve plate to move simultaneously along the support frame. Move back and forth; an equal number of material holes are provided on the upper valve plate and the lower valve plate, and the material holes on the upper valve plate are arranged alternately with the material holes on the lower valve plate, and a lower hopper fixed on the support frame is provided between the upper valve plate and the lower valve plate, and the axis of the lower hopper coincides with the axis of the discharge pipe, and the upper and lower ends of the lower hopper are both open structures. When the desulfurizer chamber is discharged, the driving end drives the upper valve plate and the lower valve plate to move so that the material holes of the upper valve plate are aligned with the discharge pipe and the upper openings of the lower hopper, and the lower valve plate closes the lower opening of the lower hopper; when the lower hopper is discharged, the driving end drives the upper valve plate and the lower valve plate to move so that the lower opening of the lower hopper is aligned with the material holes of the lower valve plate, and the upper valve plate separates the discharge pipe and the lower hopper.

[0008] The upper valve plate is located below the top of the support frame, the lower valve plate is located above the bottom of the support frame, rollers are respectively provided between the upper valve plate and the top of the support frame and between the lower valve plate and the bottom of the support frame, and the rollers are rotatably mounted on the support frame; a connecting ear is provided on the connecting seat, a connecting head connected to the connecting ear is fixed on the driving end, and the driving mechanism adopts a cylinder.

[0009] The lower end of the discharge pipe is fixedly connected with a feed pipe in contact with the upper valve plate, and a plug valve is arranged in the discharge pipe; a valve plate inspection hole is arranged on the tower body below the connecting pipe.

[0010] The inner cylinder body comprises an upper cone section, an inner cylinder section and a lower cone section which are sequentially connected from top to bottom, the upper cone section is a cone structure which is small at the top and large at the bottom, the inner cylinder section is a cylindrical structure, and the lower cone section is a cone structure which is large at the top and small at the bottom.

[0011] The connecting rib plate comprises an upper rib plate and a lower rib plate, wherein the upper rib plate is fixedly connected between the upper portion of the inner cylinder section and the upper cylinder of the outer cylinder, and the lower rib plate is connected between the lower cone section and the bottom cone of the outer cylinder.

[0012] The air-permeable net is arranged on the upper cone section of the inner cylinder and the lower section of the inner cylinder section; the area of ​​the air-permeable net on the inner cylinder section is larger than the area of ​​the air-permeable net on the upper cone section.

[0013] The louvers on the middle cylinder of the outer cylinder are divided into more than two groups in the circumferential direction of the middle cylinder, and two adjacent groups of louvers are connected by a vertically arranged connecting plate, the upper end of the connecting plate is fixedly connected to the lower end of the upper cylinder, and the lower end of the connecting plate is fixedly connected to the upper end of the bottom cone.

[0014] A nitrogen purge gas distribution pipe is arranged in the discharge bin, an air inlet of the nitrogen purge gas distribution pipe is located outside the tower body, and the nitrogen purge gas distribution pipe is evenly connected with gas distribution branch pipes inside the tower body.

[0015] A maintenance manhole is provided on the lower side of the desulfurizer chamber on the tower body.

[0016] The beneficial effects of the present invention are as follows: when the present invention is used, the external raw coal gas is introduced into the tower body through the coal gas inlet, the coal gas first passes through the air inlet chamber, and then enters the air inlet grille, a large amount of dust in the coal gas is intercepted by the material in the air inlet grille, and uniformly enters the desulfurizer chamber upward under the air flow uniformity of the air inlet grille, the coal gas is purified by the desulfurizer in the desulfurizer chamber and enters the air outlet chamber, and the purified coal gas is discharged through the coal gas outlet; the desulfurizer is added into the tower body through the desulfurizer inlet, and the unloading mechanism intermittently discharges the material to the discharge bin during operation, the material in the tower is not easy to agglomerate, the air flow distribution effect is good, the utilization rate of the desulfurizer in the desulfurizer chamber is high, and the resistance of the purification tower is stable. As time goes by, when the discharged material reaches a certain value, the desulfurizer in the tower is replenished, and the desulfurizer in the discharge bin is discharged out of the tower through the desulfurizer discharge outlet.

[0017] The present invention arranges an air intake grille in the air intake chamber, and the coal gas can be evenly distributed through the air intake grille, and evenly contact the desulfurizer upwards, which plays a role in airflow distribution. At the same time, the air intake grille also plays a role in blocking dust. The specific operation process is: under the action of gravity, the desulfurizer flows in through the gap between the inner cylinder and the outer cylinder, forms a particle layer between the inner cylinder and the outer cylinder, and then flows out through the discharge port; the coal gas passes through the gap between the louvers, the desulfurizer particle layer between the inner cylinder and the outer cylinder, and the air permeable net on the inner cylinder section of the inner cylinder in turn, enters the internal cavity of the inner cylinder, and then is discharged from the air permeable net on the upper cone section of the inner cylinder and enters the desulfurizer bed layer of the coal gas purification tower upward. In this process, the coal gas is evenly distributed several times, and the uniformity of airflow distribution is greatly improved. At the same time, under the filtration and interception of the desulfurizer particle layer between the inner cylinder and the outer cylinder, most of the dust in the coal gas is removed, and the desulfurizer bed layer above is not easy to be blocked. The discharge mechanism below the discharge pipe is opened for discharge when needed. The function of the discharge mechanism is to discharge the used desulfurizer quantitatively through the action of the discharge mechanism under the premise of ensuring sealing. The discharge bin is the cavity of the tower body below the discharge mechanism, and the materials discharged by the discharge mechanism are stored in the discharge bin.

[0018] Since the present invention is provided with a discharge mechanism at the bottom of the purification tower, online discharge can be performed while ensuring good sealing. After the material in the tower starts to flow, the corresponding dust accumulation and agglomeration problems are significantly improved, the running tower resistance remains stable, long-term stable operation can be achieved, and a large amount of operating costs can be saved.

[0019] Preferably, the unloading mechanism adopts an upper and lower valve plate structure with material holes. When the unloading mechanism is feeding, the driving mechanism drives the connecting seat and the upper and lower valve plates to move simultaneously, the opening of the upper valve plate is connected to the feeding pipe, and the lower valve plate cuts off the outflow of the material at the outlet of the lower hopper, and the material flows into the lower hopper under the action of gravity; when the unloading mechanism is discharging, the driving mechanism drives the connecting seat and the upper and lower valve plates to return to their positions, the upper valve plate cuts off the inflow of the material at the feeding pipe, and the opening of the lower valve plate is connected to the outlet of the lower hopper, and the material flows out of the lower hopper under the action of gravity and enters the discharge bin. When the material in the discharge bin reaches a certain amount, the desulfurizer discharged by the unloading mechanism is regularly discharged out of the tower through the desulfurizer discharge outlet. The unloading mechanism can not only temporarily store the discharged material in the desulfurizer chamber, but also avoid excessive material discharge at one time.

[0020] Preferably, rollers are respectively arranged between the upper and lower valve plates and the support frame, and the upper valve plate and the lower valve plate move on the rollers, thereby reducing the movement resistance of the upper valve plate and the lower valve plate.

[0021] Preferably, the inner cylinder body adopts a three-section structure of an upper cone section, an inner cylinder section and a lower cone section. The desulfurizer is filled in the area between the inner cylinder section and the middle cylinder of the outer cylinder, and between the lower cone section and the bottom cone of the outer cylinder. The air permeable net is arranged on the inner cylinder section and the upper cone section. The air permeable net on the inner cylinder section is used to intake air into the inner cylinder, and the air permeable net on the upper cone section is used to discharge the gas in the inner cylinder.

[0022] Preferably, the inner cylinder and the outer cylinder are connected by using an upper rib plate and a lower rib plate, so that the connection between the inner cylinder and the outer cylinder is more stable.

[0023] Preferably, the louvers are connected together by a connecting plate, so that the outer cylinder structure is more stable.

[0024] Preferably, when entering the tower for maintenance, replacing materials, etc., in order to ensure the safety of the operation, the gas and air in the tower need to be purged cleanly. In order to prevent the dead zone of purging in the tower, especially the desulfurizer in the discharge bin, which is difficult to be purged thoroughly, the present invention arranges a purge nitrogen gas distribution pipe in the air inlet chamber of the tower body, and the gas in the tower body, especially the desulfurizer, can be quickly purged and replaced through the evenly distributed gas distribution branches. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a structural schematic diagram of a gas purification tower with automatic discharge according to an embodiment of the present invention;

[0026] Figure 2 yes Figure 1 Schematic diagram of the structure of the central air intake grille

[0027] Figure 3 yes Figure 2 Schematic diagram of the structure of the middle inner cylinder;

[0028] Figure 4 yes Figure 1 sectional view of;

[0029] Figure 5 yes Figure 4 sectional view of;

[0030] Figure 6 It is a cross-sectional view of the tower body at the gas distribution pipe.

[0031] In the figure: 1-tower body, 1.1-gas outlet chamber, 1.11-gas outlet, 1.2-desulfurizer chamber, 1.21-desulfurizer inlet, 1.3-gas inlet chamber, 1.31-gas inlet, 1.4-discharge bin, 1.41-desulfurizer outlet, 1.5-level meter interface;

[0032] 2-intake grille, 2.1-outer cylinder, 2.11-upper cylinder, 2.12-middle cylinder, 2.13-bottom cone, 2.14-louver plate, 2.15-connecting plate, 2.2-inner cylinder, 2.21-air permeable net, 2.22-upper cone section, 2.23-inner cylinder section, 2.24-lower cone section, 2.3-connecting rib plate, 2.4-discharge pipe, 2.5-gate valve;

[0033] 3-discharging mechanism, 3.1-support frame, 3.2-upper valve plate, 3.3-lower valve plate, 3.4-connecting seat, 3.5-driving mechanism, 3.6-material hole, 3.7-lower hopper, 3.8-connecting pipe, 3.9-roller, 3.10-connecting head, 3.11-connecting ear, 3.12-feeding pipe;

[0034] 5-nitrogen purge gas distribution pipe, 5.1-gas distribution branch pipe, 6-inspection manhole, 7-valve plate inspection hole. DETAILED DESCRIPTION

[0035] The present invention is described in detail below with reference to the accompanying drawings and specific embodiments.

[0036] The structure of the automatic discharge gas purification tower of one embodiment of the present invention is as follows Figures 1 to 5 As shown, the automatic discharge gas purification tower of this embodiment includes a tower body 1, in which a desulfurizer is filled. A level meter interface 1.5 is arranged on the top of the tower body, and a level meter for measuring the height of the desulfurizer chamber level is installed in the level meter interface. The tower body 1 is provided with a gas outlet 1.11 and a gas inlet 1.31 at the top and bottom, respectively. A desulfurizer inlet 1.21 is provided at the top of the tower body 1, and a desulfurizer outlet 1.41 is provided at the bottom of the tower body 1. Inside the tower body 1, from top to bottom, there are an outlet chamber 1.1, a desulfurizer chamber 1.2, an inlet chamber 1.3, and a discharge bin 1.4. The outlet chamber 1.1 and the desulfurizer chamber 1.2 are located in the same cavity. The gas outlet 1.11 is located on the side of the outlet chamber 1.1, and the desulfurizer inlet 1.21 is located on the top of the outlet chamber 1.1. A partition is provided between the desulfurizer chamber 1.2 and the inlet chamber 1.3. The gas inlet 1.31 is provided on the side of the inlet chamber 1.3. An inlet grille 2 fixed on the partition and connected to the desulfurizer chamber 1.2 is provided in the inlet chamber 1.3. Figure 6 As shown, a nitrogen purge gas distribution pipe 5 is provided in the discharge bin 1.4, the air inlet of the nitrogen purge gas distribution pipe 5 is located outside the tower body 1, and the nitrogen purge gas distribution pipe 5 is evenly connected with gas distribution branch pipes 5.1 in the tower body. A maintenance manhole 6 is provided on the lower side of the desulfurizer chamber 1.2 on the tower body 1.

[0037] like Figures 2 to 3As shown, the air intake grille 2 includes an outer cylinder 2.1 and an inner cylinder 2.2 located inside the outer cylinder 2.1, the outer cylinder 2.1 includes an upper cylinder 2.11, a middle cylinder 2.12 and a bottom cone 2.13 which are sequentially connected from top to bottom, the top of the upper cylinder 2.11 is an open structure, and louvers 2.14 are arranged at intervals up and down in the circumferential direction of the middle cylinder 2.12, the bottom of each louver 2.14 is inclined toward the inner cylinder 2.2, the bottom cone 2.13 adopts a structure that is larger at the top and smaller at the bottom and has an opening at the bottom, and a discharge pipe 2.4 is connected to the opening at the bottom of the bottom cone 2.13; the louvers on the middle cylinder of the outer cylinder are divided into more than two groups in the circumferential direction of the middle cylinder, and two adjacent groups of louvers are connected by a vertically arranged connecting plate 2.15, the upper end of the connecting plate 2.15 is fixedly connected to the lower end of the upper cylinder 2.11, and the lower end of the connecting plate 2.15 is fixedly connected to the upper end of the bottom cone 2.13.

[0038] The upper and lower ends of the inner cylinder 2.2 are both closed structures, the upper part of the inner cylinder 2.2 is a conical structure with the tip facing upward, the upper part and the side of the inner cylinder 2.2 are respectively provided with an air-permeable net 2.21, the mesh diameter of the air-permeable net 2.21 is smaller than the diameter of the desulfurizer particles, and a connecting rib plate 2.3 is fixedly connected between the inner cylinder 2.2 and the outer cylinder 2.1; the inner cylinder 2.2 includes an upper cone section 2.22, an inner cylinder section 2.23 and a lower cone section 2.24 which are connected together from top to bottom in sequence, the upper cone section 2.22 is a conical structure with a small upper part and a large lower part, the inner cylinder section 2.23 is a cylindrical structure, and the lower cone section 2.24 is a conical structure with a large upper part and a small lower part. The connecting rib plate 2.3 includes an upper rib plate and a lower rib plate, the upper rib plate is fixedly connected between the upper part of the inner cylinder section 2.23 and the upper cylinder 2.11 of the outer cylinder body 2.1, and the lower rib plate is connected between the lower cone section 2.24 and the bottom cone 2.13 of the outer cylinder body 2.1. The air permeable net 2.21 is arranged on the upper cone section of the inner cylinder body 2.2 and the lower section of the inner cylinder section 2.23; the area of ​​the air permeable net on the lower section of the inner cylinder section is larger than the area of ​​the air permeable net on the upper cone section.

[0039] The air inlet chamber 1.3 is connected to the discharge bin 1.4, and the discharge pipe 2.4 is connected to a discharge mechanism 3 for discharging materials into the discharge bin 1.4. A support frame 3.1 fixed to the tower body 1 is provided between the air inlet chamber 1.3 and the discharge bin 1.4, and the support frame 3.1 is located below the air inlet grille 2. Figures 4 to 5As shown, the unloading mechanism 3 includes an upper valve plate 3.2 and a lower valve plate 3.3 which are spaced apart from each other, and a driving mechanism 3.5. The upper valve plate 3.2 and the lower valve plate 3.3 are both slidably mounted on the support frame 3.1. One end of the upper valve plate 3.2 and the lower valve plate 3.3 are connected via a connecting seat 3.4. A connecting pipe 3.8 for connecting the inside and outside of the tower body 1 is provided on the wall of the tower body 1 near the connecting seat 3.4. The main body of the driving mechanism 3.5 is installed at a position where the connecting pipe 3.8 is located outside the tower body 1 and is sealed with the connecting pipe 3.8. The driving end of the driving mechanism 3.5 passes through the connecting pipe 3.8 and is connected to the connecting seat 3.4. When the driving end is in motion, it drives the upper valve plate 3.2 and the lower valve plate 3.3 to move back and forth simultaneously along the support frame 3.1. An equal number of material holes 3.6 are provided on the upper valve plate 3.2 and the lower valve plate 3.3. The material holes 3.6 on the upper valve plate 3.2 are arranged alternately with the material holes 3.6 on the lower valve plate 3.3. A lower hopper 3.7 fixed on the support frame 3.1 is arranged between the upper valve plate 3.2 and the lower valve plate 3.3. The axis of the lower hopper 3.7 coincides with the axis of the discharge pipe 2.4. The upper and lower parts of the lower hopper 3.7 are both open structures. When the desulfurizer chamber 1.2 is discharged, the driving end drives the upper valve plate 3.2 and the lower valve plate 3.3 to move. When the lower hopper 3.7 is discharged, the driving end drives the upper valve plate 3.2 and the lower valve plate 3.3 to move so that the lower end opening of the lower hopper 3.7 is aligned with the material hole 3.6 of the lower valve plate 3.3, and the upper valve plate 3.2 separates the discharge pipe 2.4 from the lower hopper 3.7.

[0040] The upper valve plate 3.2 is located below the top of the support frame 3.1, and the lower valve plate 3.3 is located above the bottom of the support frame 3.1. Roller shafts 3.9 are respectively arranged between the upper valve plate 3.2 and the top of the support frame 3.1, and between the lower valve plate 3.1 and the bottom of the support frame 3.1. The roller shafts 3.9 are rotatably mounted on the support frame 3.1. A connecting ear 3.11 is arranged on the connecting seat 3.4, and a connecting head 3.10 connected to the connecting ear 3.11 is fixed on the driving end. The driving mechanism 3.5 adopts a cylinder.

[0041] The lower end of the discharge pipe 2.4 is fixedly connected with a feed pipe 3.12 in contact with the upper valve plate 3.2, and a plug valve 2.5 is arranged in the discharge pipe 2.4; a valve plate inspection hole 7 is arranged on the tower body 1 below the connecting pipe 3.8.

[0042] When the coal gas purification tower of this embodiment is used, the coal gas in the external raw coal gas pipeline is introduced into the tower body of the coal gas purification tower through the coal gas inlet, the coal gas first passes through the air inlet chamber, and then enters the air inlet grille, a large amount of dust in the coal gas is intercepted by the material in the air inlet grille, and uniformly enters the desulfurizer chamber upward under the air flow uniformity of the air inlet grille, the desulfurizer in the desulfurizer chamber is used to purify organic matter such as H2S, COS in the coal gas, and a granular desulfurizer with an activated carbon matrix can be used, and a granular desulfurizer with other matrices can also be used; the coal gas is purified by the desulfurizer in the desulfurizer chamber and enters the gas outlet chamber, and the purified coal gas is discharged into the external clean coal gas pipeline through the coal gas outlet. The desulfurizer is added to the tower body from the desulfurizer inlet, and the unloading mechanism discharging the material to the discharge bin intermittently during operation, the material in the tower is not easy to agglomerate, the air flow distribution effect is good, the utilization rate of the desulfurizer in the bed is high, and the resistance of the purification tower is stable. As time goes by, when the discharged material reaches a certain value, the desulfurizer level in the tower drops and triggers the level meter alarm. At this time, the desulfurizer in the tower is replenished, and the desulfurizer in the discharge bin is discharged out of the tower through the desulfurizer discharge port.

[0043] The present invention arranges an air intake grille in the air intake chamber, and the coal gas can be evenly distributed through the air intake grille, and evenly contact the desulfurizer upward, which plays a role in air flow distribution. At the same time, the air intake grille also plays a role in blocking dust. The outer cylinder in the air intake grille is used to limit the flow direction of the desulfurizer and support the air intake grille components and the air louver; the louver is used to limit the flow direction of the desulfurizer and play a role in air permeability and uniformity; the inner cylinder is used to limit the flow direction of the desulfurizer and support the air permeable net; the air permeable net is used to limit the flow direction of the desulfurizer and play a role in air permeability and uniformity; the connecting rib plate is used to support and connect the outer cylinder and the inner cylinder; the vertically arranged connecting plate is used to support and connect each louver; the opening at the bottom of the bottom cone is the discharge port, and the desulfurizer between the inner cylinder and the outer cylinder is connected to the discharge pipe below through the discharge port for downward discharge. When the discharge mechanism needs to be repaired, the gate valve on the discharge pipe is closed to cut off the desulfurizer.

[0044] Under the action of gravity, the desulfurizer flows in through the gap between the inner cylinder and the outer cylinder, forming a particle layer between the inner cylinder and the outer cylinder, and then flows out through the discharge port. The coal gas passes through the gap between the louvers, the desulfurizer particle layer between the inner cylinder and the outer cylinder, and the air permeable net on the inner cylinder section of the inner cylinder, and enters the inner cavity of the inner cylinder, and then is discharged from the air permeable net on the upper cone section of the inner cylinder and enters the desulfurizer bed layer of the gas purification tower. In this process, the coal gas is evenly distributed several times, and the uniformity of the air flow distribution is greatly improved. At the same time, most of the dust in the coal gas is removed under the filtration and interception of the desulfurizer particle layer between the inner cylinder and the outer cylinder, and the desulfurizer bed layer above is not easy to be blocked.

[0045] The discharge mechanism below the discharge pipe is opened for discharge when needed. The function of the discharge mechanism is to discharge the used desulfurizer quantitatively through the action of the upper and lower valve plates in the discharge mechanism under the premise of ensuring sealing. The discharge bin is the cavity of the tower body below the discharge mechanism, and the materials discharged by the discharge mechanism are stored in the discharge bin. The driving mechanism of this embodiment adopts a cylinder to provide power to push the connecting seat and the upper and lower valve plates to move simultaneously, thereby realizing discharging; the connecting pipe is used to connect the tower body and the cylinder, and to achieve sealing between the tower body and the main body of the driving mechanism; the connecting ear is used to connect the connecting head and the connecting seat, and the connecting head is used to connect the driving end and the connecting ear to realize transmission; the upper valve plate and the lower valve plate are used to cut off the materials above and below the lower hopper respectively; the support frame is fixedly connected to the tower body, and is used to support various components in the unloading mechanism; the roller shaft is used to support and drag the upper valve plate and the lower valve plate, and the upper valve plate and the lower valve plate move on the roller shaft, thereby reducing the movement resistance of the upper valve plate and the lower valve plate; the lower hopper is used to temporarily store the materials unloaded during the unloading process; the feed pipe is connected to the discharge pipe on the air intake grille, and the desulfurizer enters the lower hopper of the unloading mechanism from the feed pipe.

[0046] The cylinder of the unloading mechanism is connected to the connecting pipe through a flange, and the flange surface has good sealing performance. The cylinder gas source uses an inert gas with a pressure higher than the gas pressure in the tower, usually nitrogen. Even if the seal of the components in the cylinder is lost, the gas will not leak out of the tower, and the purification tower has good sealing and safety. When the unloading mechanism is feeding, the cylinder shaft is pushed in, the opening of the upper valve plate is connected to the feeding pipe, and the lower valve plate cuts off the outflow of the material at the outlet of the lower hopper. The material flows into the lower hopper under the action of gravity and fills the lower hopper; when the unloading mechanism is discharging, the cylinder shaft is pushed back, the upper valve plate cuts off the inflow of the material at the feeding pipe, and the opening of the lower valve plate is connected to the outlet of the lower hopper. The material flows out of the lower hopper under the action of gravity and enters the discharge bin. When the material in the discharge bin reaches a certain amount, the desulfurizer discharged by the unloading mechanism is regularly discharged out of the tower through the desulfurizer discharge outlet. When the unloading mechanism needs to be repaired, the lower valve plate can be taken out from the valve plate inspection hole.

[0047] When entering the tower for maintenance, replacing materials and other operations are required, in order to ensure the safety of the operation, the gas and air in the tower need to be purged cleanly. In order to prevent the purging dead zone in the tower, especially the desulfurizer in the discharge bin is not easy to be purged thoroughly, the present invention arranges a purging nitrogen gas distribution pipe in the air inlet chamber of the tower body. The nitrogen gas distribution pipe is evenly distributed on the cross section of the tower body. A small-hole and large-resistance gas distribution method is adopted, so that the gas accumulated in the tower body, especially in the desulfurizer, can be quickly and thoroughly purged and replaced. Due to the uniformity of its gas distribution, the nitrogen usage in the purging process is significantly reduced.

[0048] Since the present invention is provided with a discharge mechanism at the bottom of the purification tower, online discharge can be performed while ensuring good sealing. After the material in the tower starts to flow, the corresponding dust accumulation and agglomeration problems are significantly improved, the running tower resistance remains stable, long-term stable operation can be achieved, and a large amount of operating costs can be saved.

[0049] The actual operation of the project shows that the operating resistance of the conventional fixed-bed gas purification tower increases by about 2 times after the initial operation and 6 months of operation. Based on engineering experience, it is estimated that the resistance of each 10,000 m 3 / h gas, every 3kPa increase in resistance loss will cause an annual power consumption of about 90,000 kW*h, and the operating cost will increase significantly. However, there is no significant difference in operating resistance between the initial operation and 6 months after the gas purification tower with a bottom unloading mechanism was put into operation, and the operating cost was significantly reduced.

[0050] The above embodiment is a preferred embodiment of the present invention, and the basic principles, main features and advantages of the present invention are shown and described above. Obviously, the present invention is not limited to the above embodiment, and there are many variations. All variations that can be directly derived or associated with the content disclosed by ordinary technicians in this field should be considered as the protection scope of the present invention.

Claims

1. A gas purification tower with automatic discharge, comprising a tower body, a desulfurizer is installed in the tower body, a gas outlet and a gas inlet are respectively arranged at the top and bottom of the tower body, a desulfurizer inlet is arranged at the top of the tower body, and a desulfurizer outlet is arranged at the bottom of the tower body, characterized in that: The tower body is composed of an air outlet chamber, a desulfurizer chamber, an air inlet chamber and a discharge bin from top to bottom. The air outlet chamber and the desulfurizer chamber are located in the same cavity. The coal gas outlet is located on the side of the air outlet chamber, and the desulfurizer inlet is located on the top of the air outlet chamber. A partition is provided between the desulfurizer chamber and the air inlet chamber. The coal gas inlet is arranged on the side of the air inlet chamber. An air inlet grille fixed on the partition and connected to the desulfurizer chamber is provided in the air inlet chamber. The air inlet grille comprises an outer cylinder body and an inner cylinder body located in the outer cylinder body. The outer cylinder body comprises an upper cylinder, a middle cylinder and a bottom cone which are connected together from top to bottom. The top of the upper cylinder is an open structure. Louvers are arranged on the circumference of the middle cylinder at intervals up and down. The bottom of each louver is inclined toward the inner cylinder body. The bottom cone adopts a structure that is larger at the top and smaller at the bottom and has an opening at the bottom. A discharge bin is connected to the opening at the bottom of the bottom cone. Tube, the upper and lower ends of the inner cylinder are both closed structures, the upper part of the inner cylinder is a conical structure with the tip facing upward, the upper part and side of the inner cylinder are respectively provided with air permeable nets, the mesh diameter of the air permeable net is smaller than the diameter of the desulfurizer particles, and a connecting rib plate is fixedly connected between the inner cylinder and the outer cylinder; the air inlet chamber is connected to the discharge bin, and the discharge pipe is connected with a unloading mechanism for discharging into the discharge bin; the desulfurizer flows in through the gap between the inner cylinder and the outer cylinder under the action of gravity, forms a particle layer between the inner cylinder and the outer cylinder, and then flows out through the discharge port; the coal gas passes through the gap between the louver plates, the desulfurizer particle layer between the inner cylinder and the outer cylinder, and the air permeable net on the inner cylinder section of the inner cylinder in turn, enters the internal cavity of the inner cylinder, and then is discharged from the air permeable net on the upper cone section of the inner cylinder and enters the desulfurizer bed layer of the coal gas purification tower upward.

2. The automatic discharge gas purification tower according to claim 1, characterized in that: A support frame fixed to the tower body is provided between the air inlet chamber and the discharge bin, and the support frame is located below the air inlet grille. The unloading mechanism includes an upper valve plate and a lower valve plate spaced apart from each other and a driving mechanism. The upper valve plate and the lower valve plate are both slidably mounted on the support frame, and one end of the upper valve plate and the lower valve plate are connected by a connecting seat. A connecting pipe for connecting the inside and outside of the tower body is provided on the wall of the tower body near the connecting seat. The main body of the driving mechanism is installed at the position of the connecting pipe outside the tower body and is sealed with the connecting pipe. The driving end of the driving mechanism passes through the connecting pipe and is connected to the connecting seat. When the driving end is actuated, it drives the upper valve plate and the lower valve plate to move simultaneously along the support frame. Move back and forth; an equal number of material holes are provided on the upper valve plate and the lower valve plate, and the material holes on the upper valve plate are arranged alternately with the material holes on the lower valve plate, and a lower hopper fixed on the support frame is provided between the upper valve plate and the lower valve plate, and the axis of the lower hopper coincides with the axis of the discharge pipe, and the upper and lower ends of the lower hopper are both open structures. When the desulfurizer chamber is discharged, the driving end drives the upper valve plate and the lower valve plate to move so that the material holes of the upper valve plate are aligned with the discharge pipe and the upper openings of the lower hopper, and the lower valve plate closes the lower opening of the lower hopper; when the lower hopper is discharged, the driving end drives the upper valve plate and the lower valve plate to move so that the lower opening of the lower hopper is aligned with the material holes of the lower valve plate, and the upper valve plate separates the discharge pipe and the lower hopper.

3. The automatic discharge gas purification tower according to claim 2 is characterized in that: The upper valve plate is located below the top of the support frame, the lower valve plate is located above the bottom of the support frame, rollers are respectively provided between the upper valve plate and the top of the support frame and between the lower valve plate and the bottom of the support frame, and the rollers are rotatably mounted on the support frame; a connecting ear is provided on the connecting seat, a connecting head connected to the connecting ear is fixed on the driving end, and the driving mechanism adopts a cylinder.

4. The automatic discharge gas purification tower according to claim 2, characterized in that: The lower end of the discharge pipe is fixedly connected with a feed pipe in contact with the upper valve plate, and a plug valve is arranged in the discharge pipe; a valve plate inspection hole is arranged on the tower body below the connecting pipe.

5. The automatic discharge gas purification tower according to claim 1, characterized in that: The inner cylinder body comprises an upper cone section, an inner cylinder section and a lower cone section which are sequentially connected from top to bottom, the upper cone section is a cone structure which is small at the top and large at the bottom, the inner cylinder section is a cylindrical structure, and the lower cone section is a cone structure which is large at the top and small at the bottom.

6. The automatic discharge gas purification tower according to claim 5, characterized in that: The connecting rib plate comprises an upper rib plate and a lower rib plate, wherein the upper rib plate is fixedly connected between the upper portion of the inner cylinder section and the upper cylinder of the outer cylinder, and the lower rib plate is connected between the lower cone section and the bottom cone of the outer cylinder.

7. The automatic discharge gas purification tower according to claim 5, characterized in that: The air-permeable net is arranged on the upper cone section of the inner cylinder and the lower section of the inner cylinder section; the area of ​​the air-permeable net on the inner cylinder section is larger than the area of ​​the air-permeable net on the upper cone section.

8. The automatic discharge gas purification tower according to claim 1, characterized in that: The louvers on the middle cylinder of the outer cylinder are divided into more than two groups in the circumferential direction of the middle cylinder, and two adjacent groups of louvers are connected by a vertically arranged connecting plate, the upper end of the connecting plate is fixedly connected to the lower end of the upper cylinder, and the lower end of the connecting plate is fixedly connected to the upper end of the bottom cone.

9. The automatic discharge gas purification tower according to claim 1, characterized in that: A nitrogen purge gas distribution pipe is arranged in the discharge bin, an air inlet of the nitrogen purge gas distribution pipe is located outside the tower body, and the nitrogen purge gas distribution pipe is evenly connected with gas distribution branch pipes inside the tower body.

10. The automatic discharge gas purification tower according to claim 1, characterized in that: A maintenance manhole is provided on the lower side of the desulfurizer chamber on the tower body.

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