SCR (Selective Catalytic Reduction) catalyst thermal regeneration closed ash removal device
By designing a closed ash cleaning device for thermal regeneration of SCR catalysts, the sealed ash cleaning box, dust removal settlement chamber, air nozzle and two-stage dust removal filter element, the problem of blocking catalyst adhesions in low-temperature environments and the problem of no regeneration devices during the project construction period is solved, and the catalyst's efficient ash cleaning and denitrification efficiency is improved.
Patent Information
- Application Number
- CN202420789366.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-04-17
- Publication Date
- 2025-03-14
- Estimated Expiration
- 2034-04-17
AI Technical Summary
Under low temperature environment, the crystalline precipitates of ammonia sulfate on the surface of the SCR catalyst will adhere, blocking the active surface of the catalyst, affecting the denitrification efficiency. In addition, many projects do not have a regeneration device during the construction period, and the thermal regeneration of the catalyst cannot be achieved.
A closed ash cleaning device for thermal regeneration of SCR catalysts is designed, including a closed ash cleaning box, a dust removal settlement chamber, an air nozzle and a two-stage dust removal filter element. The sliding mechanism and the motor-driven air nozzle are used to achieve all-round soot blowing, combining the first-stage and second-stage dust removal filter elements to effectively reduce the dust in the exhaust gas.
The catalyst is sealed and cleaned, which avoids dust escape, improves denitrification efficiency, reduces environmental pollution, and is movable design to facilitate installation and use on site in different projects.
Smart Images
Figure CN222605960U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the field of SCR catalyst thermal regeneration, in particular to an SCR catalyst thermal regeneration closed dust cleaning device. Background Art
[0002] As domestic environmental protection requirements gradually increase, the flue gas denitrification of various waste power plants has been upgraded from the original SNCR to SCR. However, due to the particularity of the flue gas purification process of waste power plants, the flue gas SCR denitrification is conventionally arranged at the tail of the flue gas purification. However, after the front-end deacidification and heavy metal removal, the flue gas temperature at the outlet of the bag filter is conventionally 145°C. SCR denitrification mostly uses medium and low temperature catalysts, and the reaction temperature is controlled at 180°C to 220°C, so the energy consumption is relatively low. However, in a low temperature environment, crystals of ammonium sulfate will appear. This substance is adhesive and will stick to the catalyst surface, blocking the catalyst active surface and affecting the denitrification efficiency. Therefore, the low-temperature catalyst needs to be regenerated regularly to restore its activity, or replaced with a new catalyst.
[0003] Catalyst thermal regeneration technology can be divided into two types according to its function: "online thermal regeneration" and "offline thermal regeneration". Online thermal regeneration is to set up a bypass in the SCR system, switch to the bypass through the flue gas damper door, and the flue gas will go through the bypass, and thermal regeneration will be carried out in the SCR reactor. However, since many projects did not design regeneration devices during the construction period, regeneration cannot be achieved, and the SCR catalyst cannot be cleaned. Utility Model Content
[0004] In view of the shortcomings of the prior art, the utility model provides a SCR catalyst thermal regeneration closed dust cleaning device. The entire device of the utility model is in a skid-mounted form, which is easy to install and use. As the catalyst is used for a long time, a lot of dust will adhere to the catalyst surface, blocking the catalyst pores. The dust cannot be removed during thermal regeneration, and a set of special dust cleaning devices is required; it is also a movable skid-mounted dust cleaning device, which can facilitate the cleaning of the SCR catalyst.
[0005] To achieve the above purpose, the utility model provides the following technical solutions:
[0006] A SCR catalyst thermal regeneration closed dust cleaning device comprises a closed dust cleaning box, an air nozzle is arranged at the upper end of the closed dust cleaning box, and a dust removal settling chamber is arranged on one side; a plurality of dust removal filter elements are arranged in the dust removal settling chamber, and an exhaust fan is arranged at the upper end; the air nozzle is connected to a sliding mechanism.
[0007] As a further solution of the utility model, a track is provided in the closed dust cleaning box for the operation of a mobile trolley; the mobile trolley is used to carry the catalyst in and out of the closed dust cleaning box.
[0008] As a further solution of the utility model, a motor is provided at one end of the sliding mechanism for driving the air nozzle to slide left and right on the sliding mechanism.
[0009] As a further solution of the utility model, a compressed air access device is provided at the upper end of the air nozzle, and a soot blowing valve and a back-blowing valve are provided on the air access device.
[0010] As a further solution of the utility model, the dust removal filter element includes a primary dust removal filter element and a secondary dust removal filter element. The primary dust removal filter element is located between the dust removal and settling chamber and the closed dust cleaning box; the secondary dust removal filter element is located on the inner side of the upper end of the dust removal and settling chamber.
[0011] As a further solution of the utility model, the air nozzle is connected to the soot blowing valve through a pipeline, and the back-blowing valve is connected to the upper end of the secondary dust removal filter element through a pipeline.
[0012] As a further solution of the utility model, the exhaust fan is provided with a dust removal exhaust port, and the dust removal exhaust port is connected to the inlet flue of the deacidification tower of the waste incineration.
[0013] The utility model has the following beneficial effects:
[0014] The utility model is a container-type mobile device, which is easy to install at the project site and can be transported to another project by trailer for catalyst regeneration. The entire device is a closed structure, and no dust escapes during the catalyst cleaning process, which is an environmentally friendly device. The high-pressure nozzle can move left and right, and can achieve all-round soot blowing without dead angles. The two-stage dust removal filter element can effectively reduce the dust content in the exhaust gas, making the device more environmentally friendly.
[0015] In order to more clearly illustrate the structural features and functions of the present invention, the present invention is described in detail below in conjunction with the accompanying drawings and specific embodiments. BRIEF DESCRIPTION OF THE DRAWINGS
[0016] Figure 1 This is a schematic diagram of the structure of the embodiment of the present utility model. DETAILED DESCRIPTION
[0017] The present invention will be further described below in conjunction with the accompanying drawings and related knowledge, and described clearly and completely. Obviously, the described application is only a part of the embodiments of the present invention, rather than all the embodiments.
[0018] In view of the fact that many existing flue gas denitrification projects in waste power plants do not have regeneration devices designed during the construction period, a movable SCR catalyst thermal regeneration device has been developed. The entire device is skid-mounted, easy to install and use. It can be used to remove dust during offline thermal regeneration of SCR denitrification catalysts, and to reduce environmental pollution during catalyst cleaning.
[0019] Reference Figure 1 As shown, the utility model provides an SCR catalyst thermal regeneration closed dust cleaning device, including a closed dust cleaning box 1, a dust removal settling chamber 2, an air nozzle 3, and the air nozzle 3 is further preferably a compressed air nozzle, a sliding mechanism 4 (nozzle moving mechanism), a dust removal filter element, an exhaust fan 5, a control system, etc.;
[0020] A track 6 is provided in the closed dust cleaning box 1 for the movement of a mobile trolley 8; the mobile trolley is used to carry the catalyst 7 in and out of the closed dust cleaning box, see Figure 1 As shown, the closed dust cleaning box is provided with a closed door for sealing. Figure 1 Not marked in the figure, before work, the catalyst 7 is moved into the closed dust cleaning box 1 by a mobile vehicle 8.
[0021] In the preferred embodiment of the utility model, the dust cleaning device is provided with four wheels (rubber wheels) with brakes to facilitate the transportation of the device, and the catalyst enters and exits the dust cleaning device automatically by using an external transmission mechanism of a trolley;
[0022] In a preferred embodiment of the utility model, a motor 9 is provided at one end of the sliding mechanism 4 for driving the air nozzle to slide left and right on the sliding mechanism. It is further preferred that the motor 9 is a servo motor.
[0023] In a preferred embodiment of the utility model, a compressed air access device 10 is provided at the upper end of the air nozzle, and a soot blowing valve 11 and a back-blowing valve 12 are provided on the air access device. The dust filter element includes a primary dust filter element 13 and a secondary dust filter element 14. The primary dust filter element 13 is located between the dust collection and settling chamber and the closed dust cleaning box, and is used for the first filtering of the dust blown into the closed dust cleaning box; the secondary dust filter element is located on the inner side of the upper end of the dust collection and settling chamber, and performs a second filtering. It is further preferred that the air nozzle 3 is connected to the soot blowing valve 11 through a pipeline, and the back-blowing valve 12 is connected to the upper end of the secondary dust filter element 14 through a pipeline. It is further preferred that the back-blowing valve 12 is connected to the upper end of the secondary dust filter element 14 through a filter element back-blowing air bag 15, which can be used to remove dust from the secondary dust filter element 14 to prevent blockage. Figure 1 As shown, the working process is to first remove dust from the catalyst 7 through the soot blowing valve 11, and the dust enters the dust collection and settling chamber through the first-stage dust removal filter 13, and then the dust-removed air is discharged through the exhaust fan 5 and the second-stage dust removal filter 14; the use of a two-stage dust removal filter can effectively reduce the dust content in the exhaust gas, making the device more environmentally friendly.
[0024] In the preferred embodiment of the utility model, the exhaust fan 5 is provided with a dust removal exhaust port 16, and the dust removal exhaust port is connected to the inlet flue of the deacidification tower of the garbage incineration, so that the waste gas enters the deacidification tower for further treatment;
[0025] In the utility model, the overall working process is: remove the catalyst from the SCR denitration reactor → use a mobile trolley to transfer the catalyst into a closed ash cleaning box → open the ash blowing valve and start ash blowing → the nozzle starts to move slowly back and forth, and blows the catalyst back and forth → at the same time, the exhaust fan starts → after the ash blowing time is reached, stop ash blowing → the flue gas of the exhaust fan enters the inlet flue of the deacidification tower of the waste incineration → open the backblowing valve, backblowing and cleaning the filter element → start the ash blowing valve again, and blow the catalyst for the second time → after the ash blowing is completed, check whether the catalyst has been cleaned of dust.
[0026] In the utility model, the sootblowing valve is preferably an automatic sootblowing valve; and a PLC control program is introduced, and the sootblowing valve and the backblowing valve are automatically controlled by the program. The device is fully integrated with the PLC control program, and the operating programs of various equipment, instruments, control valves, etc. are integrated into the PLC, which can achieve one-button start and automatic control, with a high degree of automation.
[0027] The technical principle of the utility model is described above in combination with the specific embodiments, which are only the preferred implementation methods of the utility model. The protection scope of the utility model is not limited to the above embodiments, and all technical solutions under the idea of the utility model belong to the protection scope of the utility model. Those skilled in the art can think of other specific implementation methods of the utility model without creative labor, and these methods will fall within the protection scope of the utility model.
Claims
1. A SCR catalyst thermal regeneration closed dust cleaning device, characterized in that: It comprises a closed dust cleaning box, wherein an air nozzle is arranged at the upper end of the closed dust cleaning box, and a dust removal settling chamber is arranged at one side; a plurality of dust removal filter elements are arranged in the dust removal settling chamber, and an exhaust fan is arranged at the upper end; the air nozzle is connected with a sliding mechanism.
2. The SCR catalyst thermal regeneration closed dust cleaning device according to claim 1, characterized in that: Tracks are arranged in the closed dust cleaning box for the movement of a mobile trolley; the mobile trolley is used to carry the catalyst in and out of the closed dust cleaning box.
3. The SCR catalyst thermal regeneration closed dust cleaning device according to claim 2, characterized in that: A motor is arranged at one end of the sliding mechanism to drive the air nozzle to slide left and right on the sliding mechanism.
4. The SCR catalyst thermal regeneration closed dust cleaning device according to claim 3, characterized in that: A compressed air access device is arranged at the upper end of the air nozzle, and a soot blowing valve and a back-blowing valve are arranged on the air access device.
5. The SCR catalyst thermal regeneration closed dust cleaning device according to claim 4, characterized in that: The dust removal filter element includes a primary dust removal filter element and a secondary dust removal filter element. The primary dust removal filter element is located between the dust removal settling chamber and the closed dust cleaning box; the secondary dust removal filter element is located on the inner side of the upper end of the dust removal settling chamber.
6. The SCR catalyst thermal regeneration closed dust cleaning device according to claim 5, characterized in that: The air nozzle is connected to the soot blowing valve through a pipeline, and the back-blowing valve is connected to the upper end of the secondary dust removal filter element through a pipeline.
7. The SCR catalyst thermal regeneration closed dust cleaning device according to claim 6, characterized in that: The exhaust fan is provided with a dust removal exhaust port, and the dust removal exhaust port is connected to the inlet flue of the deacidification tower of the garbage incineration.