Ash removal equipment for catalyst in SCR (Selective Catalytic Reduction) denitration reactor
By designing ash cleaning equipment, the problem of blockage of SCR denitrification catalysts is solved, and the efficient cleaning of the catalyst is achieved, which improves the safety and economicality of equipment operation.
Patent Information
- Application Number
- CN202510422649.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-04-07
- Publication Date
- 2025-07-04
AI Technical Summary
In the prior art, the blockage of the SCR denitrification catalyst leads to a decrease in denitrification performance, and the regeneration process has large investment and long cycles, which poses safety and environmental risks, and is seriously wasted on the regeneration of catalysts with good performance.
A cleaning device is designed, including a connecting device, an air collection device, a blowing device and a cleaning medium generation device. The cleaning medium is uniformly entered the catalyst hole through the blowing device to realize the cleaning treatment of the catalyst.
It realizes efficient ash cleaning of catalyst pores, is simple to operate, reduces wear risk, improves denitrification performance and catalyst life, and improves the safety and economicality of equipment operation.
Smart Images
Figure CN120242737A_ABST
Abstract
Description
Technical Field
[0001] Embodiments of the present disclosure belong to the technical field of catalyst soot cleaning, and particularly relate to a soot cleaning device for a catalyst in an SCR denitration reactor. Background Art
[0002] Currently, the thermal power generation industry, the cement industry, and the steel industry are all steadily implementing ultra-low emission strategies. To meet the requirement that the NOx concentration in ultra-low emissions needs to be reduced to below 50 mg / m 3 each industry has generally installed SCR flue gas denitration devices and adopted a high-temperature and high-dust layout method, that is, the SCR denitration device is arranged between the economizer and the air preheater. There will be a large amount of fly ash in the flue gas, and the fly ash concentration is approximately 20 g / m 3 -100 g / m 3 . During the operation of the SCR denitration catalyst, a large amount of fly ash deposition will block the catalyst pores, cause the flue gas flow field to skew, deactivate the catalyst, reduce the denitration performance, trigger the blockage of the downstream equipment ABS, and affect the safe and economic operation of the unit.
[0003] Currently, the main method for dealing with catalyst pore blockage is regeneration, and there are no other effective cleaning measures during on-site shutdown maintenance. The overall project investment for catalyst regeneration is relatively large, and the cycle is generally more than 30 days. There are certain safety and environmental protection risks in disassembly, installation, and hazardous waste transportation. In addition, it is also a waste to regenerate a catalyst with good performance that is only deactivated due to pore blockage. Therefore, it is necessary to develop a reliable and easy-to-operate device and a supporting method to realize the function of catalyst soot cleaning in the reactor and improve the safety and economy of unit operation. Summary of the Invention
[0004] Embodiments of the present disclosure aim to at least solve one of the technical problems existing in the prior art, and provide a soot cleaning device for a catalyst in an SCR denitration reactor.
[0005] One aspect of the embodiments of the present disclosure provides a soot cleaning device for a catalyst in an SCR denitration reactor, and the soot cleaning device includes: a connection device, a gas collection device, a jetting device, and a soot cleaning medium generating device;
[0006] The soot cleaning medium generating device is used to provide a soot cleaning medium, and the soot cleaning medium generating device has a gas supply port;
[0007] The connection device has a medium channel, and the first end of the connection device is connected to the soot cleaning medium generating device so that the medium channel is communicated with the gas supply port;
[0008] A gas collecting device has an air inlet end and an air outlet end. The air inlet end of the gas collecting device is connected to the second end of the connecting device, so that the gas collecting device is communicated with the medium channel through the air inlet end.
[0009] A blowing device is correspondingly arranged with the holes of the catalyst in the SCR denitration reactor. The blowing device has an air inlet and is communicated with the air outlet end of the gas collecting device through the air inlet. Wherein, the ash cleaning medium is introduced into the holes of the catalyst through the blowing device for ash cleaning treatment.
[0010] Optionally, the gas collecting device includes a communicating guide section and a buffer section;
[0011] One end of the guide section away from the buffer section has an air inlet end, and the guide section is communicated with the medium channel of the connecting device through the air inlet end; One end of the buffer section away from the guide section has an air outlet end, and the buffer section is communicated with the blowing device through the air outlet end.
[0012] Optionally, along the direction from the air inlet end to the air outlet end of the gas collecting device, the cross-sectional dimension of the guide section gradually expands.
[0013] Optionally, the guide section includes a guide shell and a guide plate;
[0014] One end of the guide shell is connected to the connecting device, and the other end is connected to the buffer section; The guide plate is arranged on the inner wall of the guide shell for guiding the medium gas flow in the guide shell.
[0015] Optionally, the shape of the buffer section is adapted to the cross-section of the SCR denitration catalyst.
[0016] Optionally, the blowing device includes a plurality of pipe fittings, and the buffer section is provided with a plurality of holes. Among them, the plurality of pipe fittings are connected to the plurality of holes in one-to-one correspondence.
[0017] The beneficial effects of the embodiments of the present disclosure include:
[0018] The ash cleaning equipment of the present disclosure can realize ash cleaning of the catalyst pores in the SCR denitration reactor, and the operation is simple and convenient, and the equipment is reliable in use. Description of the Drawings
[0019] Figure 1 It is a schematic structural diagram of an ash cleaning equipment for the catalyst in the SCR denitration reactor according to an embodiment of the present disclosure;
[0020] Figure 2 It is a schematic structural diagram of an ash cleaning equipment for the catalyst in the SCR denitration reactor according to another embodiment of the present disclosure.
[0021] In the figure, 1 is the connecting device; 2 is the gas collecting device; 3 is the jetting device; 11 is the internal thread section; 21 is the flow guiding section; 22 is the buffer section. Specific embodiments
[0022] To enable those skilled in the art to better understand the technical solutions of the present disclosure, the present disclosure will be further described in detail below with reference to the accompanying drawings and specific embodiments.
[0023] The following further describes the embodiments of the present application in detail with reference to the accompanying drawings and examples. The detailed description and drawings of the following examples are used to exemplarily illustrate the principles of the present application, but cannot be used to limit the scope of the present application, that is, the present application is not limited to the described embodiments. In the description of the present application, it should be noted that unless otherwise specified, the meaning of "a plurality" is two or more; the terms "upper", "lower", "left", "right", "inner", "outer", etc. indicate the orientation or positional relationship for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus cannot be understood as a limitation of the present application. In addition, the terms "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance. "Vertical" is not strictly vertical, but within the allowable error range. "Parallel" is not strictly parallel, but within the allowable error range.
[0024] In the description of the present application, it should also be noted that unless otherwise clearly specified and limited, the terms "installed", "connected", "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected, or indirectly connected through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific circumstances.
[0025] As Figure 1-2 shown, a dust cleaning device for the catalyst in the SCR denitration reactor, the dust cleaning device includes a connecting device 1, a gas collecting device 2, a jetting device 3, and a dust cleaning medium generating device (not shown in the figure).
[0026] The soot cleaning medium generating device is used to provide a soot cleaning medium, and the soot cleaning medium generating device has a gas supply port. The connecting device 1 has a medium channel, and the first end of the connecting device 1 is connected to the soot cleaning medium generating device so that the medium channel communicates with the gas supply port. The gas collecting device 2 has an air inlet end and an air outlet end, and the air inlet end of the gas collecting device 2 is connected to the second end of the connecting device 1 so that the gas collecting device 2 communicates with the medium channel through the air inlet end. The blowing device 3 is arranged corresponding to the holes of the catalyst in the SCR denitration reactor. The blowing device 3 has an air inlet and is communicated with the air outlet end of the gas collecting device 2 through the air inlet. Among them, the soot cleaning medium is introduced into the holes of the catalyst through the blowing device 3 for soot cleaning treatment.
[0027] The soot cleaning equipment of the present disclosure can realize soot cleaning of the catalyst pores in the SCR denitration reactor, and is simple and convenient to operate, and the equipment is reliable in use.
[0028] In some embodiments, the gas collecting device 2 includes a diversion section 21 and a buffer section 22 that are connected and communicated. One end of the diversion section 21 away from the buffer section 22 has an air inlet end, and the diversion section 21 is communicated with the medium channel of the connecting device 1 through the air inlet end. One end of the buffer section 22 away from the diversion section 21 has an air outlet end, and the buffer section 22 is communicated with the blowing device 3 through the air outlet end.
[0029] The beneficial effects of the above settings include: the diversion section 21 can guide the incoming gas to flow smoothly towards the buffer section 22, thereby reducing the turbulence generated by the gas inside the pipeline, reducing the energy loss, and enabling the gas to be more evenly distributed. Further, one of the functions of the buffer section 22 is to serve as a pressure buffer zone. When the gas enters from the diversion section 21, it may carry a certain amount of kinetic energy or irregular pressure fluctuations. By setting the buffer section 22, these fluctuations can also be absorbed to ensure that the gas output to the blowing device 3 or other subsequent processing links has a relatively constant pressure, ensuring the normal operation of downstream equipment.
[0030] In some embodiments, along the direction from the air inlet end to the air outlet end of the gas collecting device 2, the cross-sectional dimension of the diversion section 21 gradually expands.
[0031] The beneficial effects of the above settings include: as the cross-sectional area of the diversion section 21 increases, the gas velocity at the same volume flow rate will decrease accordingly, which can reduce turbulence and frictional losses, make the gas flow more smoothly, and reduce energy consumption. Further, when the gas enters the larger diameter area through the smaller diameter pipeline, according to Bernoulli's principle, the decrease in flow velocity will cause the static pressure to rise. Therefore, at the rear of the gradually expanding section, the pressure of the gas is restored to a certain extent, which is beneficial to maintaining the pressure level required for subsequent processes. Further, the gradually expanding structure can also prevent reverse flow, ensure that the gas can only move in one direction, and can control the gas flow direction.
[0032] In some embodiments, the diversion section 21 includes a diversion shell and a diversion plate. One end of the diversion shell is connected to the connection device 1, and the other end is connected to the buffer section 22. The diversion plate is arranged on the inner wall of the diversion shell and is used to divert the medium gas flowing in the diversion shell.
[0033] The beneficial effects of the above settings include: The diversion plate is installed inside the diversion shell, which can effectively guide the gas to flow along a specific path, thereby ensuring uniform distribution of the air flow. This helps to avoid local overheating or pressure concentration. By adjusting the number, position and shape of the diversion plates, the air flow state can be flexibly adjusted according to different application requirements to meet specific operating conditions.
[0034] In some embodiments, the shape of the buffer section 22 is adapted to the cross-section of the SCR denitration catalyst.
[0035] By designing the shape of the buffer section 22 to match the cross-section of the SCR catalyst, it can ensure more uniform distribution of the gas entering the catalyst layer. Uniform air flow distribution helps to improve the cleaning utilization efficiency of the catalyst and enables the cleaning medium to contact the pores of the catalyst more fully, thereby improving the cleaning efficiency.
[0036] In some embodiments, the injection device 3 includes a plurality of pipe fittings, and the buffer section 22 is provided with a plurality of holes, wherein the plurality of pipe fittings are connected to the plurality of holes in a one-to-one correspondence.
[0037] Through the design of a plurality of pipe fittings, the cleaning medium gas can act evenly on each hole of the catalyst, ensuring that the entire catalyst is effectively cleaned. Compared with the design of a single outlet of the injection device 3, the distributed design of a plurality of pipe fittings can reduce the overall pressure loss of the system and improve the energy utilization efficiency.
[0038] The present disclosure provides a specific example, including: The dust cleaning device includes a connection device 1 connected to a dust cleaning medium generating device, a gas collecting device 2 connected to the connection device 1, and an injection device 3 connected to the gas collecting device, wherein the connection device includes an internal thread section 11.
[0039] The connection device 1 is cylindrical, the length g of the internal thread section 11 is greater than or equal to 50 mm, the length h of the connection device 1 is greater than or equal to 100 mm, and the outer diameter of the connection device 1 is greater than or equal to 20 mm. It can be understood that the above parameters are specifically set in combination with actual conditions.
[0040] The gas collecting device 2 includes a diversion section 21 and a buffer section 22 connected to each other. A diversion plate is arranged inside the diversion section 21 to play a role in evenly distributing the dust cleaning medium. The dust cleaning medium converges in the buffer section 22, and the buffer section 22 is used to reduce the flow direction deviation and flow velocity deviation of the dust cleaning medium to play a buffering role, ensuring that the flow velocity and pressure of the dust cleaning medium entering the injection device 3 are basically the same.
[0041] The buffer section 22 adopts a shape matching the cross-section of the SCR denitration catalyst. The cross-sectional dimensions are a×b, where a is the length dimension and b is the width dimension. The conventional catalyst can be referred to as 150mm×150mm. The buffer section 22 is provided with a plurality of circular small holes. In principle, the number of small holes is the same as the number of holes in the catalyst. For example, if the catalyst is 18 holes×18 holes, then the number of small holes is 324; if the catalyst is 13 holes×13 holes, then the number of small holes is 169, and so on. It can also be less than the number of holes in the catalyst, which is specifically determined in combination with the actual situation.
[0042] The outer diameter e of the small holes at the bottom of the buffer section 22 ranges from 4mm to 12mm. The center distance c of the small holes is the same as the pitch of the catalyst. Generally, the pitch of 18 holes×18 holes is 8.1mm - 8.2mm, specifically according to the measured value of the actual number of holes. As Figure 1 As shown in the cross-section of the buffer section 22, the width dimension j of the buffer section 22 is greater than or equal to 20mm, and the height dimension z is 150 - 180mm. The injection device 3 uses a steel pipe or an inorganic material pipe. The middle of the pipe is an empty pipe, and the length f dimension is 200 - 500mm. The steel pipe or pipe is arranged in one-to-one correspondence with the small holes on the buffer section 22. The specific dimensions of the steel pipe or pipe are selectively set according to the total length of the catalyst factory.
[0043] The ash cleaning process of the ash cleaning equipment in this application is as follows:
[0044] Before working, connect the air supply port of the ash cleaning medium generator to the internal thread section 11, and align the pipe fittings of the injection device 3 with the holes of the catalyst. Among them, the ash cleaning medium can be comprehensively judged to use a dry ice cleaning injector or compressed air in combination with the actual ash accumulation situation and the difficulty of cleaning in the duct. Taking the dry ice cleaning injector as an example, when the ash cleaning medium generator starts to work, the mixture of dry ice and air enters the gas collecting device 2 through the connecting device 1, is evenly distributed and collected in the buffer section 22 through the diversion section 21. The mixture is concentrated in the buffer section 22 and adjusts the flow rate and direction of the mixed gas flow. Then it evenly enters the injection device 3 and enters the holes of the catalyst through the pipe fittings. In this disclosure, the ash cleaning medium reaches the holes of the catalyst evenly, does not cause blow damage to the windward surface and other areas of the catalyst, and realizes ash cleaning at the same time.
[0045] In this application, after connecting the dry ice ash cleaning generator, ash cleaning treatment is carried out on the SCR denitration catalysts of each power plant. The ash cleaning effect of the catalyst is very good, and the average through-hole rate reaches more than 90%. The implementation of this method also reduces the risk of catalyst wear, improves the denitration uniformity, and has obvious effects on the extension of the catalyst life and the performance of the denitration device. This device and method are easy to operate, suitable for various types of honeycomb catalysts, have a standardized level, and improve work efficiency.
[0046] The catalyst ash cleaning equipment in the SCR denitration reactor proposed in this application is convenient to operate, has a high standardization level and working efficiency, improves the catalyst ash cleaning effect, and improves the economy and safety of denitration operation.
[0047] It can be understood that the above embodiments are merely exemplary embodiments adopted to illustrate the principles of the present disclosure. However, the present disclosure is not limited thereto. For those of ordinary skill in the art, various modifications and improvements can be made without departing from the spirit and essence of the present disclosure, and these modifications and improvements are also regarded as the protection scope of the present disclosure.
Claims
1. A dust cleaning device for the catalyst in the SCR denitration reactor, characterized in that, The soot cleaning device includes: a connecting device, a gas collecting device, a jetting device, and a soot cleaning medium generating device; The soot cleaning medium generating device is used to provide a soot cleaning medium, and the soot cleaning medium generating device has a gas supply port; The connecting device has a medium channel, and the first end of the connecting device is connected to the soot cleaning medium generating device so that the medium channel communicates with the gas supply port; The gas collecting device has an air inlet end and an air outlet end, and the air inlet end of the gas collecting device is connected to the second end of the connecting device so that the gas collecting device communicates with the medium channel through the air inlet end; The jetting device is arranged corresponding to the holes of the catalyst in the SCR denitration reactor. The jetting device has an air inlet and is communicated with the air outlet end of the gas collecting device through the air inlet. Among them, the soot cleaning medium is introduced into the holes of the catalyst through the jetting device for soot cleaning treatment.
2. The soot cleaning device for the catalyst in the SCR denitration reactor according to claim 1, characterized in that, The gas collecting device includes a diversion section and a buffer section that are communicated with each other; One end of the diversion section away from the buffer section has an air inlet end, and the diversion section is communicated with the medium channel of the connecting device through the air inlet end; one end of the buffer section away from the diversion section has an air outlet end, and the buffer section is communicated with the jetting device through the air outlet end.
3. The ash cleaning device for the catalyst in the SCR denitration reactor according to claim 2, characterized in that, In the direction from the air inlet end to the air outlet end of the gas collecting device, the cross-sectional dimension of the diversion section gradually expands.
4. The soot cleaning device for the catalyst in the SCR denitration reactor according to claim 2, characterized in that, The diversion section includes a diversion shell and a diversion plate; One end of the diversion shell is connected to the connecting device, and the other end is connected to the buffer section; the diversion plate is arranged on the inner wall of the diversion shell and is used to divert the medium gas flow flowing in the diversion shell.
5. The soot cleaning device for the catalyst in the SCR denitration reactor according to claim 2, wherein, The shape of the buffer section is adapted to the cross-section of the SCR denitration catalyst.
6. The ash cleaning device for the catalyst in the SCR denitration reactor according to claim 2, wherein, The jetting device includes a plurality of pipe fittings, and a plurality of holes are provided in the buffer section. Among them, the plurality of pipe fittings are connected to the plurality of holes in a one-to-one correspondence.