Modular drawer type quick-mounting structure of denitration catalyst

Abstract

The utility model relates to the technical field of biomass gasification furnace, concretely is denitration catalyst modularization drawer type quick -mounting structure, including reaction bin, the front of reaction bin is equipped with a plurality of drawer grooves, the inside of reaction bin is provided with a plurality of reaction cavities, and the drawer groove is located in the reaction cavity, the top of drawer groove is provided with the opening, and the reaction cavity sprays ammonia gas through ammonia gas spraying pipeline, and a row of reaction cavities are connected in series through the connecting channel. In the denitration catalyst modularization drawer type quick -mounting structure, adopt drawer type structure design, and the catalyst module can be directly pulled through the handle, and quick locking and unlocking are realized in combination with magnetic attraction piece, and it is not necessary to need complex tool and large -area to dismantle reactor, and the maintenance time and manpower cost are significantly shortened. For example, the catalyst replacement needs several hours and many people cooperation in the comparative file, and a single person can complete the replacement of single module in a few minutes.

Description

Technical Field

[0001] This utility model relates to the field of biomass gasification furnace technology, and more specifically, to a modular drawer-type quick-assembly structure for denitrification catalysts. Background Technology

[0002] With increasingly stringent environmental protection requirements, nitrogen oxide emission reduction in the fields of biomass gasification and coal-fired boilers is crucial. For example, the patent application number 201910249049.3 discloses a "biomass gasification coupled with a full-load SCR denitrification system and process method for a coal-fired boiler." By connecting a biomass gasification system with a coal-fired boiler's SCR denitrification system, the heat generated by biomass gasification is used to increase the temperature of the denitrification inlet flue gas, enabling low-load operation of the denitrification device and increasing the use of clean energy. However, this system still has certain limitations.

[0003] On the one hand, the focus is on system-level integration and flue gas temperature control, without optimizing the core catalyst installation structure within the SCR denitrification reactor. In actual operation, the denitrification catalyst, as the key to achieving nitrogen oxide reduction, often suffers from poisoning and deactivation, and decreased efficiency due to the influence of complex components in biomass gasification flue gas (such as ash, unburned carbon particles, alkali metal compounds, etc.). However, in existing technologies, the catalyst installation structure is mostly fixed or semi-fixed, requiring significant time and manpower for replacement and maintenance. For example, cleaning deposited impurities and replacing degraded catalysts requires extensive disassembly of the reactor, a cumbersome process that not only reduces equipment operating efficiency but also increases maintenance costs.

[0004] On the other hand, the system does not fully consider the uniform distribution and efficient utilization of ammonia within the denitrification reactor. In the SCR denitrification reaction, the uniformity of the mixing between ammonia and flue gas directly affects the denitrification efficiency. Uneven ammonia distribution can lead to excessive ammonia in some areas, causing escape pollution, while insufficient ammonia in other areas results in incomplete reaction. Simultaneously, the flue gas produced by biomass gasification has a high moisture content. Under low-temperature conditions, moisture easily combines with impurities, accelerating catalyst performance degradation.

[0005] Therefore, based on existing technologies, there is an urgent need to develop a modular drawer-type quick-installation structure for denitrification catalysts suitable for biomass gasification furnaces, in order to solve problems such as inconvenient catalyst replacement and maintenance, low ammonia utilization efficiency, and the influence of flue gas impurities and moisture, thereby improving the overall performance and reliability of the SCR denitrification system. Utility Model Content

[0006] The purpose of this invention is to provide a modular drawer-type quick-installation structure for denitrification catalysts, in order to solve the problem mentioned in the background art that in the SCR denitrification reaction, the uniformity of the mixing of ammonia and flue gas directly affects the denitrification efficiency. Uneven ammonia distribution can lead to excessive ammonia in some areas, resulting in escape pollution, while insufficient ammonia in other areas can lead to incomplete reaction.

[0007] To achieve the above objectives, this utility model provides a modular drawer-type quick-installation structure for denitrification catalysts, including a reaction chamber. Several drawer slots are installed on the front of the reaction chamber, and several reaction chambers are arranged on the inner side of the reaction chamber. The drawer slots are located inside the reaction chambers, and the top of the drawer slots is provided with an opening. Ammonia gas is sprayed into the reaction chambers through an ammonia gas spray pipe, and a row of reaction chambers are connected in series through a connecting channel.

[0008] This setup utilizes a drawer-style groove on the front of the reaction chamber and a reaction cavity on the inside. An opening at the top of the drawer-style groove allows for flue gas flow, and an ammonia spray pipe injects ammonia gas into the reaction cavity, achieving the SCR denitrification reaction. A row of reaction cavities is connected in series via connecting channels, allowing flue gas to flow sequentially through each cavity, thus extending the reaction path.

[0009] Preferably, the reaction chamber is equipped with support legs at both ends of its bottom.

[0010] This feature involves installing support legs at both ends of the reaction chamber to provide stable support for the device.

[0011] Preferably, the reaction chamber is provided with an upper transition chamber and a lower transition chamber at both ends. The reaction chamber and the lower transition chamber together form an S-shaped flue gas channel. One end of the flue gas channel is provided with a flue gas inlet, and the other end of the flue gas channel is provided with a flue gas outlet.

[0012] This configuration involves the upper and lower transition chambers at both ends of the reaction chamber forming an S-shaped flue gas channel together with the reaction chamber. The flue gas enters from the inlet and exits from the outlet through the S-shaped path.

[0013] Preferably, the two sides of the drawer slot are connected to the connecting channel through interfaces, a handle is installed on the front of the drawer slot, and the back of the drawer slot is magnetically connected to the inner wall of the reaction chamber through a magnetic absorbing plate.

[0014] This design features interfaces on both sides of the drawer slot that connect to the connecting channel, allowing flue gas to circulate between the reaction chambers; a handle is installed on the front for easy pull-out operation; and the back uses a magnetic plate to magnetically connect to the inner wall of the reaction chamber, enabling quick locking and unlocking.

[0015] Preferably, a drain outlet is provided on the back of the drawer slot, and a drain pipe is installed on the back of the reaction chamber. The upper end of the drain pipe is connected to the drain outlet, and the lower end of the drain pipe extends to the outside and is equipped with a valve.

[0016] This device connects the drain outlet on the back of the drawer slot to the drain pipe on the back of the reaction chamber to drain condensate.

[0017] Preferably, the ammonia spray pipeline includes several horizontal pipes, which are connected by vertical pipes. A spray plate is installed on each horizontal pipe near each reaction chamber, and a water supply pump is connected to the horizontal pipe through a water inlet pipe.

[0018] This system features a horizontal and vertical ammonia spray pipeline connected to form a grid structure. The horizontal pipes are connected to an external water pump via water inlet pipes, and the spray plates are installed on the horizontal pipes near the reaction chamber.

[0019] Preferably, the spray plate is provided with a plurality of spray holes evenly distributed.

[0020] This feature involves evenly spaced spray holes on the spray plate, allowing ammonia gas to be sprayed out uniformly through the holes.

[0021] Preferably, the drawer slots are arranged in an array on the reaction chamber.

[0022] This feature involves the drawer slots being arranged in an array on the reaction chamber, forming a regular modular layout.

[0023] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0024] This modular drawer-type quick-installation structure for denitrification catalysts employs a drawer-style design, allowing catalyst modules to be pulled out directly via a handle. Combined with magnetic closures, it enables quick locking and unlocking, eliminating the need for complex tools and extensive reactor disassembly, significantly reducing maintenance time and labor costs. For example, in the comparative document, catalyst replacement requires several hours and multiple people working together, while with this structure, a single person can complete the replacement of a single module in minutes.

[0025] The horizontal and vertical pipes of the ammonia spray pipeline connect to form a grid structure. Combined with evenly distributed spray holes on the spray plate, this allows ammonia to be uniformly injected into each reaction chamber, ensuring thorough mixing with the flue gas and improving denitrification efficiency. Experimental data shows that, under the same operating conditions, the denitrification efficiency of this structure is 10%-15% higher than that of the traditional structure, and the ammonia escape rate is reduced by more than 30%.

[0026] The S-shaped flue gas passage design extends the flue gas residence time, allowing impurities more opportunities to settle. The drain outlet on the back of the drawer slot connects to the drain pipe, enabling timely drainage of condensate and reducing the impact of moisture and impurities on the catalyst. Testing has shown that under high humidity conditions, the catalyst lifespan of this structure is 20%-30% longer than that of traditional structures.

[0027] The drawer slots are arranged in an array and connected to the connection channels via interfaces, forming a modular structure. Maintenance or replacement of a single module does not affect the operation of other modules, ensuring continuous and stable system operation. Meanwhile, the design of the support legs and transition chamber enhances structural stability, enabling it to adapt to temperature and pressure fluctuations in the biomass gasification furnace. Attached Figure Description

[0028] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0029] Figure 2 This is a schematic diagram of the internal structure of the present invention from the front.

[0030] Figure 3 This is a schematic diagram of the internal structure of the side of this utility model;

[0031] Figure 4 This is a schematic diagram of the ammonia spray pipeline in this utility model;

[0032] The meanings of the labels in the diagram are as follows:

[0033] 1. Reaction chamber; 11. Support leg; 12. Reaction cavity; 13. Connecting channel; 14. Upper transition chamber; 15. Lower transition chamber; 16. Smoke inlet; 17. Smoke outlet; 2. Drawer slot; 21. Magnetic suction plate; 22. Interface; 23. Handle; 3. Ammonia spray pipeline; 31. Horizontal pipe; 32. Vertical pipe; 33. Spray plate; 34. Water inlet pipe; 4. Drainage pipe. Detailed Implementation

[0034] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0035] This utility model provides a modular drawer-type quick-installation structure for denitrification catalysts, such as... Figure 1 , Figure 2 , Figure 3 As shown, the system includes a reaction chamber 1, with several drawer slots 2 mounted on its front. Several reaction chambers 12 are located inside the reaction chamber 1, with the drawer slots 2 situated within them. Each drawer slot 2 has an opening at its top. Ammonia gas is injected into the reaction chambers 12 through an ammonia spray pipe 3. A row of reaction chambers 12 is connected in series via a connecting channel 13. A honeycomb-shaped catalyst module is placed inside the drawer slot 2 for catalytic reaction.

[0036] The reaction chamber 1 serves as the main structure, with a drawer-shaped slot 2 on its front to accommodate the catalyst module, and an inner reaction chamber 12 providing space for the denitrification reaction. The top opening of the drawer-shaped slot 2 allows flue gas to enter, and ammonia gas is injected into the reaction chamber 12 through an ammonia spray pipe 3. A row of reaction chambers 12 are connected in series via a connecting channel 13, forming a continuous reaction path. The modular drawer-type design 2 facilitates rapid catalyst replacement, and the series-connected reaction chambers 12 and connecting channel 13 extend the flue gas residence time, improving denitrification efficiency; the overall structure is compact and has high space utilization.

[0037] In this embodiment, as Figure 1 As shown, support legs 11 are installed at the bottom of both ends of the reaction chamber 1.

[0038] The support legs 11 at both ends of the reaction chamber 1 support the entire device, ensuring its stability. The support legs 11 provide solid support, reduce the impact of vibration and external forces on the device, and extend the service life of the equipment.

[0039] Specifically, such as Figure 2 As shown, the reaction chamber 1 has an upper transition chamber 14 and a lower transition chamber 15 at both ends. The reaction chamber 12 and the lower transition chamber 15 together form an S-shaped flue gas passage. One end of the flue gas passage is provided with a flue gas inlet 16, and the other end of the flue gas passage is provided with a flue gas outlet 17.

[0040] The upper transition chamber 14 and lower transition chamber 15 at both ends of the reaction chamber 1, together with the reaction chamber 12, form an S-shaped flue gas channel. Flue gas enters from the inlet 16 and exits from the outlet 17 through the S-shaped path. The S-shaped channel prolongs the flue gas residence time, promotes thorough mixing of flue gas with ammonia and catalyst, and improves denitrification efficiency. The upper transition chamber 14 and lower transition chamber 15 optimize the flue gas flow direction and reduce dead zones.

[0041] Furthermore, such as Figure 2 , Figure 3 As shown, the two sides of the drawer slot 2 are connected to the connecting channel 13 through the interface 22. The front of the drawer slot 2 is equipped with a handle 23, and the back of the drawer slot 2 is magnetically connected to the inner wall of the reaction chamber 12 through the magnetic suction piece 21.

[0042] The interfaces 22 on both sides of the drawer slot 2 connect to the connecting channel 13 to allow flue gas to flow; the handle 23 on the front facilitates pull-out operation; the magnetic plate 21 on the back is magnetically connected to the inner wall of the reaction chamber 12 to achieve quick locking. The interface 22 ensures sealed flue gas flow, and the magnetic plate 21 cooperates with the handle 23 to shorten the catalyst module replacement time from several hours in the traditional structure to a few minutes, significantly improving maintenance efficiency.

[0043] Furthermore, such as Figure 3As shown, a drain outlet is provided on the back of the drawer slot 2, and a drain pipe 4 is installed on the back of the reaction chamber 12. The upper end of the drain pipe 4 is connected to the drain outlet, and the lower end of the drain pipe 4 extends to the outside and is equipped with a valve.

[0044] The drain outlet on the back of drawer slot 2 connects to the drain pipe 4 on the back of reaction chamber 12. The valve at the lower end of drain pipe 4 controls the drainage. This timely discharge of condensate reduces the impact of moisture and impurities on the catalyst. The combination design of drain pipe 4 and valve facilitates maintenance and repair.

[0045] Furthermore, such as Figure 4 As shown, the ammonia spray pipeline 3 includes several horizontal pipes 31, which are connected by vertical pipes 32. Spray plates 33 are installed on the horizontal pipes 31 near each reaction chamber 12. The horizontal pipes 31 are connected to a water supply pump via water inlet pipes 34.

[0046] The horizontal pipe 31 of the ammonia spray pipeline 3 is connected to the vertical pipe 32. Ammonia gas is sprayed into the spray plate 33 near the reaction chamber 12 on the horizontal pipe 31. The water supply pump is connected to the external water pipe 34. The grid-like pipelines 31 and 32 ensure that the ammonia gas is delivered evenly, and the spray plate 33 ensures that the ammonia gas is dispersed and sprayed into the reaction chamber 12, and is fully mixed with the flue gas, thereby improving the denitrification efficiency by 10%-15%.

[0047] Furthermore, several spray holes are evenly distributed on the spray plate 33.

[0048] The uniform spray holes on the spray plate 33 refine the ammonia gas injection pattern. The ammonia gas distribution is more uniform, reducing local concentration differences, improving denitrification efficiency, and reducing ammonia gas escape rate by more than 30%.

[0049] Furthermore, the drawer slots 2 are arranged in an array on the reaction chamber 1.

[0050] The drawer slots 2 are arranged in an array on the reaction chamber 1, forming a regular modular layout. The standardized design facilitates large-scale production and installation, and the array arrangement ensures that the working conditions of each reaction chamber 12 are consistent, resulting in a more stable overall denitrification effect.

[0051] In use, the modular drawer-type quick-installation structure of the denitrification catalyst of this invention first introduces nitrogen oxide-containing flue gas into the lower transition chamber 15 through the flue gas inlet 16. The lower transition chamber 15 then guides the gas to be evenly distributed to each reaction chamber 12. The flue gas flows upward within the reaction chamber 12, entering the catalyst module area through the top opening of the drawer slot 2, ensuring full contact with the catalyst. A row of reaction chambers 12 is connected in series via connecting channels 13, allowing the flue gas to flow sequentially through multiple reaction chambers 12, extending the reaction path, and finally converging through the upper transition chamber 14 to be discharged through the flue gas outlet 17.

[0052] An external water supply pump delivers ammonia gas to the horizontal pipe 31 via the water inlet pipe 34, and then distributes it to each spray plate 33 via the vertical pipe 32. The uniform spray holes on the spray plate 33 disperse the ammonia gas into the reaction chamber 12, where it mixes thoroughly with the rising flue gas, providing a reducing agent for the denitrification reaction.

[0053] Under the action of the catalyst module, ammonia reacts with nitrogen oxides in the flue gas to produce nitrogen and water, thus achieving denitrification. The S-shaped flue gas channel, formed by the reaction chamber 12, the upper transition chamber 14, and the lower transition chamber 15, extends the flue gas residence time, making the reaction more complete and improving the denitrification efficiency.

[0054] Moisture in the flue gas condenses during flow and flows into the drain pipe 4 through the drain outlet on the back of drawer slot 2. It is periodically discharged through the valve to reduce the impact of moisture on the catalyst. Some particulate impurities are deposited at the bottom of reaction chamber 12 under gravity and can be cleaned through the inspection port.

[0055] When the catalyst needs to be replaced, the operator holds handle 23 and pulls it outward to overcome the magnetic force of magnetic plate 21, pulling drawer slot 2 out of reaction chamber 12. After replacing the catalyst module, drawer slot 2 is pushed into reaction chamber 12, magnetic plate 21 automatically adsorbs and fixes it, interface 22 accurately aligns with connection channel 13, restoring the flue gas flow path.

[0056] Finally, it should be noted that the electronic components in the biomass gasification furnace and other components in this embodiment are all general standard parts or components known to those skilled in the art. Their structure and principle can be learned by those skilled in the art through technical manuals or conventional experimental methods. In the idle part of this device, all the above-mentioned electrical components are connected by wires. The specific connection method should refer to the working order between each electrical component in the above working principle to complete the electrical connection. All of these are technologies known in the art.

[0057] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely preferred examples and are not intended to limit the utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A modular drawer-type quick-assembly structure for denitrification catalysts, comprising a reaction chamber (1), characterized in that: The front of the reaction chamber (1) is equipped with several drawer slots (2), and the inner side of the reaction chamber (1) is provided with several reaction chambers (12). The drawer slots (2) are located inside the reaction chambers (12), and the top of the drawer slots (2) is provided with an opening. The reaction chambers (12) are sprayed with ammonia gas through the ammonia gas spray pipe (3), and a row of reaction chambers (12) are connected in series through a connecting channel (13).

2. The modular drawer-type quick-assembly structure for denitrification catalyst according to claim 1, characterized in that: Support legs (11) are installed at the bottom of both ends of the reaction chamber (1).

3. The modular drawer-type quick-assembly structure for denitrification catalyst according to claim 1, characterized in that: The reaction chamber (1) is provided with an upper transition chamber (14) and a lower transition chamber (15) at both ends. The reaction chamber (12) and the lower transition chamber (15) together form an S-shaped flue gas channel. One end of the flue gas channel is provided with a flue gas inlet (16) and the other end of the flue gas channel is provided with a flue gas outlet (17).

4. The modular drawer-type quick-assembly structure for denitrification catalyst according to claim 1, characterized in that: The two sides of the drawer slot (2) are connected to the connecting channel (13) through the interface (22). A handle (23) is installed on the front of the drawer slot (2). The back of the drawer slot (2) is magnetically connected to the inner wall of the reaction chamber (12) through the magnetic absorbing piece (21).

5. The modular drawer-type quick-assembly structure for denitrification catalyst according to claim 1, characterized in that: A drain outlet is provided on the back of the drawer slot (2), and a drain pipe (4) is installed on the back of the reaction chamber (12). The upper end of the drain pipe (4) is connected to the drain outlet, and the lower end of the drain pipe (4) extends to the outside and is equipped with a valve.

6. The modular drawer-type quick-assembly structure for denitrification catalyst according to claim 1, characterized in that: The ammonia spray pipeline (3) includes several horizontal pipes (31), which are connected by vertical pipes (32). A spray plate (33) is installed on each horizontal pipe (31) near each reaction chamber (12). The horizontal pipe (31) is connected to a water supply pump via a water inlet pipe (34).

7. The modular drawer-type quick-assembly structure for denitrification catalyst according to claim 6, characterized in that: The spray plate (33) has a number of spray holes evenly distributed on it.

8. The modular drawer-type quick-assembly structure for denitrification catalyst according to claim 1, characterized in that: The drawer slots (2) are arranged in an array on the reaction chamber (1).

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