Synthesis ammonia tail gas treatment device

Abstract

The utility model relates to tail gas treatment technical field discloses a kind of synthetic ammonia tail gas treatment devices, including reaction cavity, and the both ends of reaction cavity are respectively connected with gas input pipeline and gas output pipeline;Catalyst support frame is arranged in the reaction cavity, and the side of catalyst support frame close to the gas input pipeline is provided with filter screen plate;Power mechanism driven cleaning plate is arranged in the reaction cavity, and the bristle on the cleaning plate is contacted with the filter screen plate;The utility model, both can effectively remove dust in synthetic ammonia tail gas, can also avoid damage to catalyst body in the process of dust cleaning, ensure the service life of catalyst, improve the stability and economy of synthetic ammonia tail gas treatment.

Description

Technical Field

[0001] This utility model relates to the field of tail gas treatment technology, and in particular to a synthetic ammonia tail gas treatment device. Background Technology

[0002] In the process of ammonia synthesis, the tail gas typically contains unreacted ammonia (NH3) and nitrogen oxides (NOx). x It contains carbon monoxide (CO) and small amounts of dust and other impurities. In order to meet environmental emission requirements or achieve resource recovery, catalytic treatment technologies are usually used, such as selective catalytic oxidation (SCO) or selective catalytic reduction (SCR), which use catalysts to convert harmful components into harmless substances (such as N2, H2O, etc.).

[0003] However, ammonia synthesis tail gas often contains dust and other solid impurities, which are prone to deposit as the gas flows through the catalyst bed, leading to the following problems:

[0004] Catalyst clogging: Dust accumulates on the catalyst surface or in its pores, reducing catalytic activity, increasing bed pressure drop, and affecting reaction efficiency. Traditional tail gas treatment devices typically use backflushing (such as pulse jet cleaning) to remove accumulated dust. However, dust in ammonia synthesis tail gas may be difficult to remove completely due to its strong adhesion or fine particles, leading to gradual catalyst deactivation. Furthermore, during the soot blowing process, particulate dust can cause erosion and wear on the catalyst, affecting its service life.

[0005] Therefore, there is an urgent need for a tail gas treatment device that can effectively remove dust from the exhaust gas while protecting the activity of the catalyst, so as to improve the stability and economy of ammonia synthesis tail gas treatment. Utility Model Content

[0006] The purpose of this invention is to provide a synthetic ammonia tail gas treatment device that can effectively remove dust from synthetic ammonia tail gas, avoid damage to the catalyst body during the dust removal process, ensure the service life of the catalyst, and improve the stability and economy of synthetic ammonia tail gas treatment.

[0007] The present invention adopts the following technical solution:

[0008] A synthetic ammonia tail gas treatment device includes a reaction chamber, with a gas input pipe and a gas output pipe respectively connected to both ends of the reaction chamber; a catalyst support frame is installed inside the reaction chamber, and a filter screen is installed on the side of the catalyst support frame near the gas input pipe; a cleaning plate driven by a power mechanism is installed inside the reaction chamber, and the bristles on the cleaning plate contact the filter screen; a water tank is formed by a downward protrusion at the bottom of the reaction chamber, and the water tank is located on the side of the filter screen near the gas input pipe; the top of the reaction chamber extends upward to form... The device includes a receiving cavity for housing the power mechanism, with the top of the cleaning plate extending into the receiving cavity and connecting to the power mechanism; a receiving cavity protruding from the reaction chamber on one side of the receiving cavity, and the receiving cavity communicating with the receiving cavity; a water tank extending outward and communicating with the receiving cavity; a retractable sealing curtain slidably provided at the top of the water tank and the bottom of the receiving cavity, with the end of the sealing curtain connected to the cleaning plate; a buffer cavity extending outward from the side of the reaction chamber away from the receiving cavity, and both the receiving cavity and the water tank extending outward and communicating with the buffer cavity.

[0009] Preferably, the length of the cleaning plate along the gas movement direction is not greater than the length of the water tank along the gas movement direction.

[0010] Preferably, one end of the water tank is provided with a water inlet and the other end is provided with a drain outlet, and valves are provided at both the water inlet and the drain outlet.

[0011] Preferably, the cleaning plate is a U-shaped structure with the opening facing one side, and the bristles are located at the end of the cleaning plate away from the opening.

[0012] Preferably, the power mechanism may be a chain sprocket or a transmission belt and pulley disposed in the accommodating cavity.

[0013] Compared with existing technologies, the advantages of this invention are as follows: By installing a filter screen plate on one side of the catalyst support frame where the catalyst is placed, this invention can filter the gas in contact with the catalyst, reducing the erosion and wear caused by dust in the gas contacting the catalyst during flow. Simultaneously, the filter screen plate's mesh structure can disperse and evenly distribute the gas, ensuring uniform and orderly contact with the catalyst. By incorporating a cleaning plate, driven by a power mechanism, the cleaning plate can reciprocate along the surface of the filter screen plate, thereby cleaning the dust accumulated on the filter screen plate, ensuring the filtration efficiency of the filter screen plate, and avoiding the re-erosion of the catalyst by dust blowing, thus guaranteeing the catalyst's service life. Attached Figure Description

[0014] Figure 1This is a schematic diagram of the structure of an embodiment of this application;

[0015] Figure 2 This is a partial cross-sectional view of the reaction chamber in an embodiment of this application;

[0016] Figure 3 This is a top view of the water tank according to an embodiment of this application;

[0017] Figure 4 This is a schematic diagram of the structure of the cleaning plate in an embodiment of this application. Detailed Implementation

[0018] The present invention will now be described clearly and completely with reference to the accompanying drawings and embodiments:

[0019] like Figures 1 to 4 As shown, the synthetic ammonia tail gas treatment device of this utility model includes a reaction chamber 1, with a gas input pipe 2 and a gas output pipe 3 respectively connected to both ends of the reaction chamber 1; a catalyst support frame 4 is provided inside the reaction chamber 1, and multiple catalyst support frames 4 are arranged at different intervals according to the different components contained in the tail gas, so as to install different types of catalysts; a filter screen 5 is provided on the side of the catalyst support frame 4 near the gas input pipe 2, which is used to filter dust particles entrained in the synthetic ammonia tail gas, to prevent dust from directly contacting the catalyst and causing erosion and wear to the catalyst. At the same time, the filter screen 5 can also disperse the gas entering the reaction chamber 1, so that the gas flows evenly to the catalyst, avoiding erosion and wear to the catalyst caused by gas condensation and flow; in specific use, usually only the filter screen 5 is set in front of the catalyst support frame 4 near the gas input end, or a filter screen 5 can be set in front of each catalyst support frame 4. Figure 1 As shown, filter screens 5 are installed in front of both catalyst support frames 4. The mesh sizes of the two filter screens 5 can be differentiated, with the mesh size of the rear filter screen 5 being smaller than that of the front filter screen 5 to further filter and remove dust from the gas. A cleaning plate 6 driven by a power mechanism is installed inside the reaction chamber 1, with bristles on the cleaning plate 6 contacting the filter screens 5. By periodically controlling the movement of the cleaning plate 6, dust particles trapped on the surface of the filter screens 5 can be removed in a timely manner, ensuring efficient filtration of the exhaust gas. Compared to the blow-and-purge method, this application filters the gas directly before it contacts the catalyst, avoiding dust erosion and wear on the catalyst, and also avoiding secondary erosion and wear caused by dust flow during blow-and-purge cleaning, greatly ensuring the catalyst's service life.

[0020] Furthermore, the bottom of the reaction chamber 1 protrudes downwards to form a water tank 7, which is located on the side of the filter plate 5 near the gas input pipe. By filling the water tank 7 with water, the dust particles swept off the filter plate 5 can be collected. The mixing of dust and water reduces the likelihood of the swept dust being blown up again during gas flow. Preferably, the length of the cleaning plate 6 along the gas movement direction is not greater than the length of the water tank 7 along the gas movement direction to ensure that the cleaned dust falls smoothly into the water tank 7. In addition, a water inlet 16 is provided at one end of the water tank 7, and a drain outlet 8 is provided at the other end. Valves are provided at both the water inlet 16 and the drain outlet 8. A delivery pump can be installed at the drain outlet 8 to pump out the water in the water tank 7 for discharge. Figure 1 When there are two drain outlets 8, the two drain outlets 8 can be connected by a connecting pipe, and then a discharge port can be opened at the connecting pipe. By connecting the discharge port to the delivery pump, the water flow in the two water tanks 7 can be discharged synchronously.

[0021] Furthermore, the top of the reaction chamber 1 extends upward to form a receiving cavity 9 for housing the power mechanism, and the top of the cleaning plate 6 extends into the receiving cavity 9 and connects to the power mechanism; the power mechanism can specifically be a sprocket set at both ends inside the receiving cavity 9, with a chain between the two sprockets, and the cleaning plate 6 is set on one side of the bottom of the chain; one of the sprockets is driven by a motor 10; if two catalyst support frames 4 are set, two receiving cavities 9 need to be set simultaneously, and the sprockets in the two receiving cavities 9 are connected by a connecting shaft 11; the power mechanism can also be in the form of a transmission belt and pulleys, in which case the cleaning plate 6 is set on the transmission belt; it can also be implemented in the form of pulleys and wire ropes, that is, pulleys are set at both ends inside the receiving cavity 9, and a ring-shaped wire rope is sleeved in the groove of the two pulleys, and the cleaning plate 6 is set on the wire rope.

[0022] A receiving cavity 12 protrudes from the reaction chamber 1 on one side of the receiving cavity 9. The receiving cavity 9 and the receiving cavity 12 are connected, with the water tank 7 extending outward and communicating with the receiving cavity 12. During operation, the receiving cavity 12 can store the cleaning plate 6 inside, so that the cleaning brush does not contact the filter screen 5, thus reducing the area occupied by the filter screen 5 and ensuring the filtration area of ​​the gas. In addition, a retractable sealing curtain 13 is slidably installed on the top of the water tank 7 and the bottom of the receiving cavity 9. The end of the sealing curtain 13 is connected to the cleaning plate 6. The sealing curtain 13 can be made of multi-segment waterproof cloth that can be folded and stretched. A sliding rod 14 is provided between two adjacent segments of waterproof cloth. The sliding rod 14 is slidably connected to the sliding grooves opened on the side walls of the water tank 7 and the receiving cavity 9. The sliding rod 14 at the far end is connected to the cleaning plate 6. As the cleaning plate 6 moves, the sliding rod 14 moves along the length of the water tank 7 and the receiving cavity 9, thus opening or closing the sealing curtain 13. The sealing curtain 13 seals the water tank 7 and the receiving cavity 9 when airflow passes through, reducing the adverse effects of gas flow on the power mechanism, such as scouring and erosion. The sealing of the water tank 7 prevents some substances in the gas from reacting adversely with the water, thereby affecting the gas treatment effect.

[0023] In addition, a buffer chamber 15 is provided on the side of the reaction chamber 1 away from the receiving chamber, and the receiving chamber 9 and the water tank 7 both extend outward and are connected to the buffer chamber 15. The buffer chamber 15 provides a certain storage space for the fully stored sealing curtain 13, reducing the space occupied by the filter screen 5 and ensuring that the thorough cleaning of the filter screen 5 is not affected. In this embodiment, the cleaning plate 6 is a U-shaped structure with the opening facing one side, with one end of the opening facing the buffer space, and the bristles are located at the end of the cleaning plate 6 away from the opening. With this arrangement, when cleaning the filter screen 5, the sealing curtain 13 on the water tank 7 is opened first, and then the bristles come into contact with the filter screen 5 to perform the cleaning operation, ensuring that the dust can fall smoothly into the water tank 7, reducing the probability of the cleaned dust falling onto the sealing curtain 13.

[0024] When using this invention, if it is necessary to clean the filter screen plate 5, the motor 10 is turned on to control the movement of the cleaning plate 6. As the cleaning plate 6 moves, the sealing curtain 13 will gradually open, and then the bristles will move out from the storage cavity and come into contact with the filter screen plate 5. The dust particles that are cleaned off the filter screen plate 5 will fall into the water tank 7 and mix with the water, preventing the cleaned dust from being disturbed by external factors and re-adhering to the filter screen plate 5. After cleaning, the cleaning plate 6 is reset. Finally, the water in the water tank 7 is drained and replaced periodically.

Claims

1. A synthetic ammonia tail gas treatment device, characterized in that: The reaction chamber includes a gas input pipe and a gas output pipe connected to its two ends. A catalyst support frame is installed inside the reaction chamber, and a filter screen is positioned on the side of the catalyst support frame near the gas input pipe. A cleaning plate driven by a power mechanism is installed inside the reaction chamber, with bristles on the cleaning plate contacting the filter screen. A water tank protrudes downwards from the bottom of the reaction chamber, located on the side of the filter screen near the gas input pipe. The top of the reaction chamber extends upwards to form a structure for power supply. The mechanism includes a receiving cavity, with the top of the cleaning plate extending into the receiving cavity and connecting to the power mechanism; a receiving cavity protruding from the reaction chamber on one side of the receiving cavity, and the receiving cavity communicating with the receiving cavity; a water tank extending outward and communicating with the receiving cavity; a retractable sealing curtain slidably provided at the top of the water tank and the bottom of the receiving cavity, the end of the sealing curtain being connected to the cleaning plate; a buffer cavity extending outward from the side of the reaction chamber away from the receiving cavity, and both the receiving cavity and the water tank extending outward and communicating with the buffer cavity.

2. The ammonia synthesis tail gas treatment device according to claim 1, characterized in that: The length of the cleaning plate along the gas movement direction is not greater than the length of the water tank along the gas movement direction.

3. The ammonia synthesis tail gas treatment device according to claim 1, characterized in that: The water tank has a water inlet at one end and a drain outlet at the other end, and both the water inlet and the drain outlet are equipped with valves.

4. The ammonia synthesis tail gas treatment device according to claim 1, characterized in that: The cleaning plate is a U-shaped structure with the opening facing one side, and the bristles are located at the end of the cleaning plate away from the opening.

5. The ammonia synthesis tail gas treatment device according to claim 1, characterized in that: The power mechanism may be a chain and sprocket or a transmission belt and pulley disposed in the accommodating cavity.

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