Device for laying a denitration catalyst on a ceramic filter element

Abstract

The application aims to provide a device for laying denitration catalyst on ceramic filter core, which can homogenize and uniformly lay denitration catalyst liquid on ceramic filter core pipe. The denitration catalyst liquid is placed in a liquid pool, the lower end of a ring-shaped soft belt is hung on the pipe of the ceramic filter core pipe to be treated, the ceramic filter core pipe is vertically hung and immersed in the denitration catalyst liquid according to the gravity, and the ceramic filter core pipe is driven to rotate in the denitration catalyst liquid through the ring-shaped soft belt when the main rotating shaft rotates. The concentration of the denitration catalyst liquid at different positions is homogenized, and the laid catalyst at different positions of the pipe body is also very uniform during the rotation of the ceramic filter core pipe.

Description

TECHNICAL FIELD

[0001] The present application relates to the treatment technology of flue gas, in particular to the equipment for laying denitration catalyst on ceramic filter core. BACKGROUND

[0002] Due to the enhancement of environmental awareness, environmental regulations are becoming more stringent, and smoke emission standards are a problem that all smelting, thermal power, cement and other enterprises involved in smoke must face.

[0003] The current general flue gas treatment scheme is to first implement denitration and desulfurization. The denitration and desulfurization scheme is divided into wet, dry and dry-wet combined treatment schemes. The flue gas after desulfurization and denitration is treated by dust removal. The whole process chain is long, the process equipment is much, the maintenance cost is high, the land occupation is large, and the investment is high.

[0004] The document 1 entitled "Denitration catalyst and its preparation method and application in flue gas denitration" (CN105854874 B - hereinafter referred to as document 1) uses a denitration catalyst to implement denitration treatment on flue gas. The preparation steps of a denitration catalyst include: carrier pretreatment, preparation of catalyst combustion solution, addition of combustion agent to precursor solution to obtain catalyst combustion solution, and calcination of the pretreated ceramic catalyst carrier soaked in the catalyst combustion solution to obtain the denitration catalyst. The pretreated ceramic catalyst carrier is soaked in the catalyst combustion solution for 5-30 min, blown with hot air, and then calcined at 400-700℃ for 3-5h to obtain the denitration catalyst. The ceramic carrier is cordierite honeycomb ceramic carrier, alumina ceramic carrier or zirconia ceramic carrier. The ceramic catalyst carrier is soaked in the catalyst combustion solution, blown with hot air, and then calcined to obtain the denitration catalyst. This is a process scheme commonly used by technicians to lay catalyst on ceramic catalyst carrier, and the denitration catalyst is only used for denitration.

[0005] The document 2 entitled "Honeycomb ceramic type multi-element metal oxide catalyst and its preparation method and application" (CN106345483 A - hereinafter referred to as document 2) is also soaked in the saturated precursor solution obtained in step 1) at 70-90℃, evaporated to 15-30% of the initial volume, and a solid-liquid mixture is obtained. The solid-liquid mixture obtained in step 2) is dried to obtain a honeycomb ceramic loaded with metal oxide. The same as document 1, the catalyst is used for simple denitration, and the process of laying catalyst on honeycomb ceramic is also simple soaking.

[0006] A method for preparing a denitration and dust removal dual-functional ceramic filter is provided in document 3 (CN105536528A - hereinafter referred to as document 3), which has both denitration and dust removal functions. The method comprises the following steps: ultrasonic cleaning of the ceramic filter and soaking treatment with sodium hydroxide, and drying to serve as a catalyst support body; dissolving a titanium salt and a morphology control agent in a solvent to form a titanium salt solution; immersing the ceramic filter in the titanium salt solution, and performing hydrolysis by oscillation or directly placing the ceramic filter in a hydrothermal reaction kettle for reaction, and then taking out the ceramic filter loaded with a TiO2 ultra-thin film, cleaning, drying, and calcining to serve as a catalyst support body.

[0007] Although document 3 claims to achieve denitration and dust removal, the ceramic filter is immersed in the titanium salt solution, or hydrolysis by oscillation, or directly placed in a hydrothermal reaction kettle for reaction. However, document 3 does not provide a corresponding scheme for how to achieve hydrolysis by oscillation.

[0008] The common problem of the above-mentioned documents 1, 2, and 3 is that it is impossible to ensure that the liquid catalyst is uniformly applied to the ceramic carrier. SUMMARY

[0009] The purpose of the present application is to provide a device for applying denitration catalyst to ceramic filter elements, which can uniformly apply denitration catalyst liquid with a uniform concentration to ceramic filter element tubes.

[0010] To achieve the above-mentioned purpose, the technical scheme adopted by the present application is as follows: a device for applying denitration catalyst to ceramic filter elements, characterized in that it comprises a liquid pool containing denitration catalyst liquid, a main rotating shaft driven by a motor above the liquid pool, the main rotating shaft being horizontally arranged, the upper end of an annular soft belt being hung around the main rotating shaft, the annular soft belt being arranged at equal lengths and at equal intervals along the length direction of the main rotating shaft, the lower end of the annular soft belt being hung around the tube of a ceramic filter element to be treated, and the ceramic filter element tube being immersed in the denitration catalyst liquid.

[0011] In the above-mentioned scheme, the denitration catalyst liquid is placed in the liquid pool, the lower end of the annular soft belt is hung around the tube of the ceramic filter element to be treated, the ceramic filter element tube is vertically hung and immersed in the denitration catalyst liquid according to its own weight, and the ceramic filter element tube is driven by the annular soft belt to rotate in the denitration catalyst liquid when the main rotating shaft rotates. The concentration of the denitration catalyst liquid at different positions is uniformized, and the catalyst applied to the tube of the ceramic filter element is also very uniform during the rotation of the ceramic filter element tube. BRIEF DESCRIPTION OF DRAWINGS

[0012] Figure 1 Front view of the present application;

[0013] Figure 2 is Figure 1 Top view of the present application;

[0014] Figure 3 is Figure 1Left view. DETAILED DESCRIPTION

[0015] As Figure 1 , 2 , 3, the device for laying ceramic filter core with denitration catalyst comprises a liquid tank 10 containing denitration catalyst liquid 1, a main rotating shaft 30 driven by a motor 20 above the tank opening of the liquid tank 10, the main rotating shaft 30 is horizontally arranged, the upper end of the annular soft belt 40 is hung around the main rotating shaft 30, the annular soft belt 40 is equally long and arranged at intervals along the length direction of the main rotating shaft 30, the lower end of the annular soft belt 40 is hung around the pipe body of the ceramic filter core pipe 2 to be treated, and the ceramic filter core pipe 2 is immersed in the denitration catalyst liquid 1.

[0016] Since the denitration catalyst agent mostly contains heavy metal oxides and has a large density, after uniform stirring, it cannot be placed statically, otherwise it is easy to precipitate, causing differences in concentration at different liquid levels of the slurry, even if it is continuously stirred, it is difficult to ensure that the concentration of each part of the pipe body of the ceramic filter core pipe 2 is uniform, which will directly lead to differences in denitration efficiency at different parts of the ceramic filter core pipe 2, that is, the flue gas passing through the pipe wall at the part of the ceramic filter core pipe 2 where the concentration of the agent does not meet the standard escapes without being treated.

[0017] In the scheme, the ceramic filter core pipe 2 is placed in the liquid tank 10, the motor 20 drives the main rotating shaft 30 to rotate, the main rotating shaft 30 drives the ceramic filter core pipe 2 to rotate in the denitration catalyst liquid 1 through the annular soft belt 40, so that the denitration catalyst liquid 1 can be continuously disturbed and homogenized, and each part of the pipe body of the ceramic filter core pipe 2 is also continuously at each liquid level of the denitration catalyst liquid 1, ensuring that the denitration catalyst is naturally and uniformly laid on the ceramic filter core pipe 2, and when the flue gas passes through the pipe wall of the ceramic filter core pipe 2, the denitration effect at each part is uniform and meets the standard.

[0018] In order to arrange the main rotating shaft 30 and the motor 20, the application provides a support 50, the main rotating shaft 30 is rotatably arranged on the top frame 51 of the support 50 by a shaft seat 60, the motor 20 is arranged on the top frame 51, and the motor 20 is connected with the main rotating shaft 30 through a transmission mechanism.

[0019] In the application, the ceramic filter core pipe 2 can be directly replaced by the bag in the existing bag-type dust collector, and the length thereof can reach 2 meters, so the length of the main rotating shaft 30 is consistent with that of the ceramic filter core pipe 2, the stability of the rotation of the main rotating shaft 30 can be ensured by providing the shaft seat 60 to support, and it is very reasonable to arrange the annular soft belt 40 at the shaft end of the rotating shaft 30 in specific implementation, as shown in Figure 1 、 2 , and

[0020] In order to avoid the axial deviation of the soft ring belt 40 when the main rotating shaft 30 rotates, the main rotating shaft 30 is provided with a belt wheel 31, and the upper end of the soft ring belt 40 is hung on the belt wheel 31. Through the constraint of the belt wheel 31, the position of the soft ring belt 40 is basically stable.

[0021] Further, the rim peripheral surface of the belt wheel 31 is concave, and the width of the concave part corresponds to the width of the soft ring belt 40. In this way, the width direction of the soft ring belt 40 can be kept flat, which can ensure that the soft ring belt 40 is smoothly hung on the wall of the ceramic filter tube 2, so as to maintain the stability of the rotation of the ceramic filter tube 2, thereby avoiding the serious axial deviation of the ceramic filter tube 2 during rotation, especially avoiding the separation of the two and the falling of the ceramic filter tube 2.

[0022] In order to improve the processing efficiency, the main rotating shaft 30 is arranged with a secondary rotating shaft 30a, the secondary rotating shaft 30a is arranged in parallel with the main rotating shaft 30, and the rotation directions of the adjacent secondary rotating shaft 30a and the main rotating shaft 30 or the adjacent secondary rotating shaft 30a are opposite. In this way, according to the actual situation of the site, the liquid medicine pool 10 can be processed into appropriate size, so as to process a proper number of ceramic filter tubes 2 in the same period, and the ceramic filter tubes 2 can be arranged on the secondary rotating shaft 30a and the main rotating shaft 30, Figure 2 、 3 The size of the equipment for processing four ceramic filter tubes 2 at the same time is shown in the figure, and the liquid medicine application efficiency can meet the production requirements.

[0023] The middle part of the top frame 51 is provided with a top frame longitudinal beam 52, which is longitudinally arranged between the two opposite arranged horizontal frame edges 53 of the top frame 51, and the middle part of the top frame longitudinal beam 52 is arranged with a motor 20. The motor 20 is arranged in the middle part of the top frame longitudinal beam 52, and the top frame longitudinal beam 52 is basically in the middle part of the top frame 51, so that the rotating power is applied from the middle part of the main rotating shaft 30 and the secondary rotating shaft 30a, the rotating synchronism of the two ends of the shaft is guaranteed, and the stability of the rotation of the ceramic filter tube 2 is guaranteed, that is, the asynchronous rotation of the two ends of the ceramic filter tube 2 is avoided.

[0024] More preferably, the transmission mechanism is that the motor shaft of the motor 20 is provided with a gear 21, the main rotating shaft 30 is provided with a power input gear 32, the gear 21 is engaged with the power input gear 32, the main rotating shaft 30 is provided with a power output gear 33, the secondary rotating shaft 30a is provided with a transmission gear 34 engaged with the power output gear 33, and the transmission gears 34 on the adjacent secondary rotating shafts 30a are engaged with each other.

[0025] The rotation process realized by the transmission mechanism is as follows: when the motor 20 works, the gear 21 on the motor shaft rotates, the power input and output gear 32 engaged with the gear 21 rotates synchronously, the main rotating shaft 30 rotates synchronously, the power output gear 33 driven by the main rotating shaft 30 rotates synchronously, the transmission gears 34 on the left and right auxiliary rotating shafts 30a engaged with the power output gear 33 rotate reversely synchronously, Figure 3 The transmission gears 34 on the right auxiliary rotating shafts 30a engage with each other, and the rightmost auxiliary rotating shaft 30a also starts to rotate, so that Figure 3 For example, if the main rotating shaft 30 rotates clockwise, the left and right auxiliary rotating shafts 30a rotate counterclockwise, and the rightmost auxiliary rotating shaft 30a rotates clockwise, and the rotation of the main rotating shaft 30 and the auxiliary rotating shaft 30a drives the ceramic filter tube 2 to rotate correspondingly, and the rotation of the ceramic filter tube 2 in different directions can fully and effectively disturb the denitration catalyst liquid 1, so as to homogenize the concentration of the denitration catalyst liquid 1.

[0026] The liquid pool 10 has a pool edge plate 11 on one side, and the pool edge plate 11 is an inclined plate with a low edge close to the liquid pool 10 and a high edge away from the liquid pool 10, and the inclination angle is 3-10°, which can have a proper flow guiding effect.

[0027] When the ceramic filter tube 2 immersed in the liquid is lifted away from the surface of the denitration catalyst liquid 1, it can be placed on the pool edge plate 11 first, and the ceramic filter tube 2 is kept rotating, and the liquid dropped on the pool edge plate 11 is guided into the liquid pool 10, and then it is moved to the drying box, and the ceramic filter tube 2 can still rotate in the drying box until the denitration catalyst liquid 1 is uniformly solidified on the ceramic filter tube 2.

[0028] In order to obtain a suitable rotating speed of the ceramic filter tube 2, the motor shaft end of the motor 20 is connected to a speed reducer, and then the speed reducer is connected to the gear 21 to drive the main rotating shaft 30 after reducing the rotating speed, and the power input gear 32 and the gear 21 can be selected to have a gear ratio, so as to further reduce the rotating speed. When the filter tube is immersed in the liquid, the rotating speed of the ceramic filter tube 2 is 1-2 rpm.

[0029] The rotating support makes the filter tube rotate continuously when it is immersed in the slurry, moved and dried, so as to ensure that the catalysts inside and outside the filter tube are uniformly distributed, and the denitration and dust removal efficiency of the ceramic filter tube 2 is the same.

Claims

1. A device for applying a denitrification catalyst to a ceramic filter element, characterized in that: The system includes a liquid tank (10) for containing denitrification catalyst solution (1). Above the opening of the liquid tank (10) is a main rotating shaft (30) driven by a motor (20). The main rotating shaft (30) is arranged horizontally. The upper end of an annular soft belt (40) is wrapped around the main rotating shaft (30). The annular soft belts (40) are of equal length and are arranged at intervals along the length direction of the main rotating shaft (30). The lower end of the annular soft belt (40) is wrapped around the body of the ceramic filter tube (2) to be treated. The ceramic filter tube (2) is suspended by its own weight and immersed in the denitrification catalyst solution (1). When the main rotating shaft (30) rotates, it drives the ceramic filter tube (2) to rotate in the denitrification catalyst solution (1) through the annular soft belt (40) to homogenize the solution. A secondary shaft (30a) is arranged on the side of the main shaft (30). The secondary shaft (30a) is arranged parallel to the main shaft (30), and the adjacent secondary shaft (30a) rotates in the opposite direction to the main shaft (30) or the adjacent secondary shaft (30a).

2. The apparatus according to claim 1, characterized in that: The main shaft (30) is rotatably mounted on the top frame (51) of the bracket (50) by the bearing seat (60), and the motor (20) is mounted on the top frame (51). The motor (20) is connected to the main shaft (30) via a transmission mechanism.

3. The apparatus according to claim 1 or 2, characterized in that: The main shaft (30) is provided with a pulley (31), and the upper end of the annular soft belt (40) is wrapped around the pulley (31).

4. The apparatus according to claim 3, characterized in that: The rim of the pulley (31) is concave, and the width of the concave part matches the width of the annular soft belt (40).

5. The apparatus according to claim 1, characterized in that: A top frame longitudinal beam (52) is provided in the middle of the top frame (51). The top frame longitudinal beam (52) is placed between two oppositely arranged horizontal frame sides (53) of the top frame (51). A motor (20) is arranged in the middle of the top frame longitudinal beam (52).

6. The apparatus according to claim 5, characterized in that: The motor (20) has a gear (21) on its motor shaft and a power input gear (32) on its main shaft (30). The gear (21) meshes with the power input gear (32).

7. The apparatus according to claim 6, characterized in that: The main shaft (30) has a power output gear (33), and the auxiliary shaft (30a) has a transmission gear (34) that meshes with the power output gear (33).

8. The apparatus according to claim 7, characterized in that: The transmission gears (34) on adjacent secondary shafts (30a) mesh with each other.

9. The apparatus according to claim 1, characterized in that: The medicine tank (10) has a pool mouth edge plate (11) on one side. The pool mouth edge plate (11) is an inclined plate with a lower plate edge near the medicine tank (10) and a higher plate edge away from the medicine tank (10).

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