SCR (Selective Catalytic Reduction) denitration pulse soot blower
By designing the SCR denitrification pulse soot blowing device, the ash accumulated on the catalyst surface is cleaned by using the soot blowing tube and fan, and the soot blowing of the shaking head is realized through the swing arm, the problem of secondary blockage in the pulse spray cleaning method is solved, and the service life and spraying efficiency of the catalyst are improved.
Patent Information
- Application Number
- CN202420471551.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-03-12
- Publication Date
- 2025-03-04
- Estimated Expiration
- 2034-03-12
AI Technical Summary
The existing pulse spray cleaning methods have the risk of secondary blockage, which may lead to the catalyst hole being blocked again.
A SCR denitrification pulse soot blowing device is designed, including a soot blowing tube and a fan. The soot accumulated on the catalyst surface is blown up through the soot blowing tube, and the blown ash accumulated on the blowing soot is sucked away and discharged through the fan to avoid secondary clogging. At the same time, the device realizes the soot blowing of the head through the swing arm, the swing seat and the driving mechanism, with a larger coverage area and better effect.
It effectively avoids secondary blockage, improves the service life of the catalyst, and ensures the unblocking of the catalyst channel through scientific spraying.
Smart Images
Figure CN222550599U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of environmental protection equipment, in particular to an SCR denitration pulse soot blowing device. Background Art
[0002] SCR denitrification is a selective catalytic reduction denitrification technology, sometimes also called ammonia catalytic reduction denitrification. It is to inject ammonia or other suitable reducing agents into the flue gas upstream of the catalyst, and use the catalyst (alkaline metals such as iron, vanadium, chromium, cobalt or molybdenum) to convert NOx in the flue gas into nitrogen and water at a temperature of 200-450°C. During the use of the catalyst, dust in the flue gas can easily clog the holes of the catalyst and affect the normal use of the catalyst, so it needs to be cleaned regularly.
[0003] Common cleaning methods include sonic cleaning, pulse cleaning, and mechanical vibration cleaning. Pulse jet cleaning is to remove dust and impurities by spraying compressed air or inert gas onto the catalyst surface. The sudden release of these gases will generate pressure waves to blow away the dust on the catalyst surface. However, there will be dust accumulated on the surface or in some corners of the catalyst for a long time. The dust will become hardened and the particle size will become larger. If the hardened dust is blown into the holes of the catalyst during the spraying, it may cause secondary blockage. Therefore, cleaning the dust on the catalyst surface in advance before pulse jet cleaning will effectively improve this. Utility Model Content
[0004] The utility model solves the problem that the existing pulse jet soot cleaning method may cause secondary blockage, and provides an SCR denitration pulse soot blowing device which reduces the risk of secondary blockage.
[0005] The utility model is realized by the following technical scheme: an SCR denitration pulse soot blowing device, comprising a first air bag, a pulse valve, a pulse tube, a blowing tube, a second air bag, a soot blowing tube, and a fan.
[0006] The inlet of the first air bag is connected to the compressed air supply pipeline, and the outlet of the first air bag is connected to the pulse valve and the injection pipe in sequence through the outlet pipe. The pulse valve and the injection pipe are provided in multiple groups. The injection pipe extends into the shell of the denitration reactor. A plurality of injection holes are arranged at intervals on the injection pipe. A guide pipe is provided outside the injection hole. The guide pipe is vertically downward and directly faces the catalyst.
[0007] The inlet of the second air bag is connected to the compressed air supply pipeline, and the outlet of the second cylinder is connected to the soot blowing pipe in the denitrification reactor through a pipeline. The soot blowing pipe is horizontally arranged and close to the shell of the denitrification reactor. A plurality of nozzles are arranged on the soot blowing pipe, and the nozzles are arranged on the side of the soot blowing pipe. A suction duct is arranged on the side of the denitrification reactor away from the soot blowing pipe, and the other end of the suction duct is connected to the bypass flue or the downstream flue of the denitrification reactor, and a fan is arranged on the suction duct.
[0008] Furthermore, a swing seat is provided on the inner wall of the denitration reactor, a swing arm is connected to the soot blowing pipe, the swing arm is hinged on the swing seat, a driving mechanism is connected to the swing arm, and the driving mechanism can drive the swing arm to swing.
[0009] Furthermore, the driving mechanism is one of an electric cylinder and a pneumatic cylinder.
[0010] Furthermore, the catalyst is provided with two layers, and the soot blowing pipes are provided with two sets, and a set of the second air bag and the blower are commonly used.
[0011] Furthermore, the second air bag and the sootblowing pipeline are connected via a metal braided hose and are provided with a valve.
[0012] Furthermore, the fan is a high temperature resistant centrifugal fan.
[0013] The beneficial effects of the utility model are:
[0014] 1. The utility model is provided with a soot blowing pipe and a fan. The soot blowing pipe can blow up the accumulated dust on the surface of the catalyst. At the same time, the fan is turned on to suck the blown up accumulated dust from the air suction pipe in time and discharge it into the bypass flue or the downstream flue of the denitration reactor. After the blowing is completed, the multiple pulse valves on the first air bag are opened in sequence, and the blowing pipe sprays the catalyst below one by one to clear the channel of the catalyst, thereby achieving more scientific blowing and avoiding the compacted accumulated dust from falling into the holes of the catalyst to cause secondary blockage.
[0015] 2. The soot blowing pipe of the utility model realizes shaking head soot blowing through the swing arm, the swing seat and the driving mechanism, so that the soot blowing coverage area is larger and the effect is better.
[0016] 3. In the utility model, two layers of catalyst are provided with two sets of soot blowing pipes, which share a set of second air bag and fan, thus saving costs. BRIEF DESCRIPTION OF THE DRAWINGS
[0017] Figure 1 This is a front view of an SCR denitration pulse sootblowing device described in the utility model;
[0018] Figure 2 This is a left view of an SCR denitration pulse soot blowing device described in the utility model;
[0019] Figure 3 This is an exploded view of an SCR denitration pulse soot blowing device described in the utility model;
[0020] Figure 4 for Figure 3 A partial enlarged view of the .
[0021] In the figure: 1 first air bag; 2 pulse valve; 3 injection pipe; 4 second air bag; 5 soot blowing pipe; 6 fan; 7 suction pipe; 8 catalyst; 9 swing seat; 10 swing arm; 11 driving mechanism; 12 nozzle. DETAILED DESCRIPTION
[0022] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.
[0023] like Figure 1-4 As shown, an SCR denitration pulse soot blowing device comprises a first air bag 1, a pulse valve 2, a blowing pipe 3, a second air bag 4, a soot blowing pipe 5, and a fan 6.
[0024] The inlet of the first air bag 1 is connected to the compressed air supply pipeline, and the outlet of the first air bag 1 is connected to the pulse valve 2 and the injection pipe 3 in sequence through the outlet pipeline. The pulse valve 2 and the injection pipe 3 are provided in multiple groups. The injection pipe 3 extends into the shell of the denitration reactor. A plurality of injection holes are arranged at intervals on the injection pipe 3. A guide pipe is provided outside the injection hole. The guide pipe is vertically downward and faces the catalyst 8.
[0025] The inlet of the second air bag 4 is connected to the compressed air supply pipeline, and the outlet of the second cylinder is connected to the soot blowing pipe 5 in the denitrification reactor through a pipeline. The soot blowing pipe 5 is horizontally arranged and close to the shell of the denitrification reactor. A plurality of nozzles 12 are arranged on the soot blowing pipe 5, and the nozzles 12 are arranged on the side of the soot blowing pipe 5. A suction duct 7 is arranged on the side of the denitrification reactor away from the soot blowing pipe 5, and the other end of the suction duct 7 is connected to the bypass flue or the downstream flue of the denitrification reactor. A fan 6 is arranged on the suction duct 7.
[0026] This solution adds a set of dust purge system on the basis of conventional pulse jet, which is mainly supplied by the second air bag 4 and connected to the dust blowing pipe 5 in the reactor through a pipeline: the dust blowing pipe 5 emits a horizontal airflow (such as Figure 1The ash on the surface of the catalyst 8 is blown up, and at the same time, the fan 6 is turned on to suck the blown up ash from the suction pipe 7 in time and discharge it into the bypass flue or the downstream flue of the denitrification reactor. After the blowing is completed, the multiple pulse valves 2 on the first air bag 1 are opened in sequence, and the blowing pipe 3 sprays the catalyst 8 below one by one to clear the channel of the catalyst 8 and achieve more scientific blowing, thereby avoiding the compacted ash from falling into the holes of the catalyst 8 and causing secondary blockage.
[0027] In practical applications, the inner wall of the denitration reactor is provided with a swing seat 9, the soot blowing pipe 5 is connected with a swing arm 10, the swing arm 10 is hinged on the swing seat 9, the swing arm 10 is connected with a driving mechanism 11, and the driving mechanism 11 can drive the swing arm 10 to swing. In this solution, the swing arm 10 is driven to swing by the driving mechanism 11, and the direction of the nozzle 12 on the soot blowing pipe 5 is changed, so as to realize dynamic shaking soot blowing, with a larger soot blowing angle and a wider coverage.
[0028] In practical applications, the driving mechanism 11 is an electric cylinder or a pneumatic cylinder. In this solution, a pneumatic cylinder is used. A protective cover can be independently provided outside the cylinder, exposing only the piston rod, to protect the cylinder and increase its service life.
[0029] In actual application, the catalyst 8 is provided with two layers, the first air bag 1, the pulse valve 2, and the blowing pipe 3 are provided with two independent sets, and the soot blowing pipe 5 is provided with two sets. The two sets of soot blowing pipes 5 share a set of second air bag 4 and fan 6, which can meet the cleaning requirements of each layer of the catalyst 8.
[0030] In practical applications, the second air bag 4 and the soot blowing pipe 5 are connected by a metal braided hose and provided with a valve. The valve is an electric valve for controlling the opening and closing of the pipeline. The metal braided hose can meet the actual working condition of the soot blowing pipe 5 swinging.
[0031] In practical applications, the fan 6 adopts a high temperature resistant centrifugal fan 6, which can adapt to high temperature flue gas and increase the service life of the equipment.
[0032] In summary, the SCR denitrification pulse soot blowing device described in the utility model improves the cleaning efficiency, overcomes the problem of secondary blockage, and increases the service life of the catalyst by first cleaning the compacted soot and then performing pulse blowing.
[0033] The above shows and describes the basic principles, main features and advantages of the utility model. The technicians in this industry should understand that the above implementation is only to illustrate the technical concept and characteristics of the utility model, and its purpose is to enable people familiar with this technology to understand the content of the utility model and implement it, and it cannot be used to limit the protection scope of the utility model. All equivalent changes or modifications made according to the spirit of the utility model should be included in the protection scope of the utility model.
Claims
1. An SCR denitration pulse sootblowing device, characterized in that: It comprises a first air bag (1), a pulse valve (2), a blowing pipe (3), a second air bag (4), a soot blowing pipe (5), and a fan (6). The inlet of the first air bag (1) is connected to a compressed air supply pipeline, and the outlet of the first air bag (1) is connected to a pulse valve (2) and a blow pipe (3) in sequence through an outlet pipeline. The pulse valve (2) and the blow pipe (3) are provided in multiple groups. The blow pipe (3) extends into the shell of the denitration reactor. A plurality of blow holes are arranged at intervals on the blow pipe (3). A guide pipe is provided outside the blow hole. The guide pipe is vertically downward and faces the catalyst (8). The inlet of the second air bag (4) is connected to a compressed air supply pipeline, and the outlet of the second air bag is connected to a soot blowing pipe (5) in the denitration reactor through a pipeline. The soot blowing pipe (5) is arranged horizontally and is close to the shell of the denitration reactor. A plurality of nozzles (12) are arranged on the soot blowing pipe (5), and the nozzles (12) are arranged on the side of the soot blowing pipe (5). A suction pipe (7) is arranged on the side of the denitration reactor away from the soot blowing pipe (5), and the other end of the suction pipe (7) is connected to a bypass flue or a downstream flue of the denitration reactor. A fan (6) is arranged on the suction pipe (7).
2. The SCR denitration pulse sootblowing device according to claim 1, characterized in that: The inner wall of the denitration reactor is provided with a swing seat (9), the soot blowing pipe (5) is connected with a swing arm (10), the swing arm (10) is hinged on the swing seat (9), the swing arm (10) is connected with a driving mechanism (11), and the driving mechanism (11) can drive the swing arm (10) to swing.
3. The SCR denitration pulse sootblowing device according to claim 2 is characterized in that: The driving mechanism (11) is one of an electric cylinder and a pneumatic cylinder.
4. The SCR denitration pulse sootblowing device according to claim 1, characterized in that: The catalyst (8) is provided with two layers, and the soot blowing pipe (5) is provided with two sets, which share a set of second air bag (4) and fan (6).
5. The SCR denitration pulse sootblowing device according to claim 1, characterized in that: The second air bag (4) and the soot blowing pipe (5) are connected via a metal braided hose and are provided with a valve.
6. The SCR denitration pulse sootblowing device according to claim 1, characterized in that: The fan (6) is a high temperature resistant centrifugal fan (6).