Online cleaning device and method for activated carbon desulfurization and denitrification adsorption tower

Abstract

The application discloses an online cleaning device and method for an activated carbon desulfurization and denitration adsorption tower, and solves the technical problem of existing technology that ammonium chloride particles block the gas inlet of a denitration bed. The online cleaning device comprises an adsorption tower, a denitration assembly in the tower body, a first downpipe and a second downpipe, a large head of the first downpipe outside the second downpipe, a small head of the first downpipe extending into the large head of the second downpipe, a gap between the small head of the first downpipe and the inner wall of the large head of the second downpipe, a gap between the first downpipe and the second downpipe forming an annular gas inlet, a flue gas outlet communicating with the large head of the first downpipe, the first downpipe and the second downpipe being used for containing activated carbon, a spraying pipeline comprising a spraying pipe and a nozzle, a gas source, the spraying pipe nozzle being sequentially communicated, and the nozzle being located at the gas inlet. The online cleaning device provided by the application can clean ammonium chloride particles online, and improve the stability of desulfurization and denitration.

Description

Technical Field

[0001] This application belongs to the field of desulfurization and denitrification technology, specifically relating to an online cleaning device and method for activated carbon desulfurization and denitrification adsorption towers. Background Technology

[0002] Activated carbon desulfurization and denitrification adsorption towers, as a type of flue gas treatment device, can efficiently remove harmful substances such as dust, SO2, NOx, dioxins, and heavy metals from flue gas, and are widely used in power generation, sintering, pelletizing, and other processes.

[0003] The adsorption tower contains desulfurization and denitrification beds arranged sequentially from bottom to top, both filled with activated carbon. In related technologies, flue gas from sintering machines and rotary kiln systems using adsorption towers can be treated. The flue gas generated by these systems is pressurized by a booster fan and enters the desulfurization bed through the flue gas inlet at the bottom of the adsorption tower. Then, it is thoroughly mixed with vaporized ammonia air in the intermediate gas chamber after the desulfurization bed before passing through the denitrification bed for denitrification. Pollutants in the flue gas are adsorbed or catalytically reacted by the activated carbon layer as they pass through the desulfurization and denitrification beds, transforming into harmless substances that are discharged from the flue gas outlet at the top of the adsorption tower. The treated flue gas, meeting emission standards, is then discharged into the atmosphere through the main chimney.

[0004] Activated carbon is added to the denitrification bed from the top of the adsorption tower and moves downwards through the desulfurization bed under gravity. During this downward movement, the activated carbon flows counter-currently with the flue gas, absorbing SO2, NOx, dioxins, heavy metals, and dust. This activated carbon is discharged through the carbon discharge port at the bottom of the adsorption tower. It is first screened by an air screen; large particles are conveyed by a bucket chain conveyor to a desorption tower for desorption. The SO2 adsorbed by the activated carbon is released and sent to the acid production system to produce 98% concentrated sulfuric acid. After desorption, the activated carbon exits the desorption tower and is screened by an air screen and a vibrating screen to remove dust. It is then conveyed by a bucket chain conveyor to the top of the adsorption tower and re-enters the denitrification bed for reuse, thus completing the material circulation process of the entire desulfurization and denitrification system.

[0005] When the flue gas reaches the denitrification bed, the HCl gas and ammonia water present in the sintering flue gas react to generate NH4Cl. The NH4Cl particles will aggregate and block the air inlet of the denitrification bed, causing the pressure difference of the adsorption tower to increase, the amount of flue gas received to decrease, and the flue gas treatment capacity to be reduced. Summary of the Invention

[0006] To address the technical problem of ammonium chloride particles clogging the air inlet of the denitrification bed, this application provides an online cleaning device and method for activated carbon desulfurization and denitrification adsorption towers.

[0007] In a first aspect of this application, an online cleaning device for activated carbon desulfurization and denitrification adsorption towers is provided, comprising: An adsorption tower includes a tower body and a denitrification assembly located within the tower body. The tower body has a flue gas inlet and a flue gas outlet. The denitrification assembly includes a first feed pipe and a second feed pipe, both of which are conical. The larger end of the first feed pipe is located outside the second feed pipe, and the smaller end of the first feed pipe extends into the larger end of the second feed pipe. The outer wall of the smaller end of the first feed pipe is spaced from the inner wall of the larger end of the second feed pipe. The space between the first and second feed pipes forms an annular air inlet, which communicates with the flue gas inlet. The flue gas outlet communicates with the larger end of the first feed pipe. Both the first and second feed pipes are used to contain activated carbon. The jetting pipeline includes a jetting pipe and a nozzle, with the air source, the jetting pipe and the nozzle connected in sequence, and the nozzle located at the air inlet.

[0008] In some embodiments, a control component is also included, which includes a controller, a first pressure sensor for detecting the flue gas inlet of the adsorption tower, and a second pressure sensor for detecting the gas outlet of the second feed pipe. The blowpipe is equipped with an electrically controlled valve, and the controller is electrically connected to the first pressure sensor, the second pressure sensor, and the valve.

[0009] In some embodiments, the blowpipe is equipped with a manual valve, which is located closer to the air source than the electrically controlled valve.

[0010] In some embodiments, the denitrification assembly is provided in multiple ways, and the air inlets of the multiple denitrification assemblies are all connected to the flue gas inlet, and the air outlets of the multiple denitrification assemblies are all connected to the flue gas outlet. The blowpipe includes a main pipe and multiple branch pipes. The number of nozzles is the same as the number of branch pipes and they correspond one-to-one. The input end of the main pipe is connected to the air source. The multiple branch pipes are connected in parallel to the output end of the main pipe. The nozzles are connected to the output ends of the corresponding branch pipes. Each air inlet of the denitrification component is provided with a corresponding nozzle.

[0011] In some embodiments, the tower body is provided with multiple processing chambers, each of which is provided with a flue gas inlet and a flue gas outlet; The adsorption tower includes denitrification modules that are the same number as and correspond one-to-one with the processing chambers. The denitrification modules are located in the corresponding processing chambers, and each denitrification module includes multiple denitrification components. The number of the jetting pipes is the same as the number of the denitrification modules and they correspond one-to-one. The nozzles of the jetting pipes are located inside the air inlet of the corresponding denitrification module.

[0012] In some embodiments, each air inlet is provided with a plurality of nozzles, which are arranged sequentially along the circumference of the air inlet; the distance between two adjacent nozzles is 90mm to 110mm.

[0013] In a second aspect of this application, an online cleaning method for an online cleaning device for an activated carbon desulfurization and denitrification adsorption tower based on the first aspect is provided, comprising: The air is blown into the air inlet of the adsorption tower through the nozzles of the blow-through pipeline for a first set cycle and a set blowing duration. Based on the first pressure at the flue gas inlet of the adsorption tower and the second pressure at the flue gas outlet, the cycle and duration of the blowing of air from the nozzle of the blowing pipeline to the air inlet are controlled.

[0014] In some embodiments, the cycle of the nozzles in the blowing pipeline blowing air into the air inlet is controlled based on a first pressure at the flue gas inlet of the adsorption tower and a second pressure at the flue gas outlet, including: If the difference between the first pressure and the second pressure is greater than a set value, and the blowing cycle is greater than the second set cycle, then the blowing cycle of the nozzle to the air inlet is reduced; if the blowing cycle is not greater than the second set cycle, then the blowing duration of the nozzle to the air inlet is extended; the second set cycle is less than the first set cycle.

[0015] In some implementations, the first set period is 80 min to 100 min, and the first blowing duration is 8 s to 12 s. In some implementations, the set value is 1.2 kPa to 1.7 kPa.

[0016] The online cleaning device for activated carbon desulfurization and denitrification adsorption tower provided in the embodiments of this application includes an adsorption tower and a jetting pipeline. The adsorption tower includes a tower body and a denitrification component located within the tower body. The tower body is provided with a flue gas inlet and a flue gas outlet. The denitrification component includes a first feed pipe and a second feed pipe, both of which are conical. The larger end of the first feed pipe is located outside the second feed pipe, and the smaller end of the first feed pipe extends into the larger end of the second feed pipe. The outer wall of the smaller end of the first feed pipe is spaced from the inner wall of the larger end of the second feed pipe. The space between the first and second feed pipes forms an annular air inlet, which is connected to the flue gas inlet, and the flue gas outlet is connected to the larger end of the first feed pipe. Both the first and second feed pipes are used to contain activated carbon. The jetting pipeline includes a jetting pipe and a nozzle. The gas source, the jetting pipe, and the nozzle are connected in sequence, and the nozzle is located at the air inlet.

[0017] The flue gas rising from the bottom of the tower moves downward through the annular inlet to the smaller end of the first feed pipe, then enters from the lower end of the first feed pipe and moves upward, contacting the activated carbon inside for denitrification. Because the gap between the first and second feed pipes, i.e., the radial dimension of the annular inlet, is too small, the resulting ammonium chloride particles easily accumulate and clog the inlet. Placing the nozzle at the annular inlet directly breaks up the ammonium chloride particles, causing them to become dust that moves away from the adsorption tower with the flue gas, ensuring the stability of the adsorption tower's denitrification process. Attached Figure Description

[0018] Figure 1 A schematic diagram of the activated carbon desulfurization and denitrification adsorption tower of this application is shown.

[0019] Figure 2 A side view of an activated carbon desulfurization and denitrification adsorption tower is shown.

[0020] Explanation of reference numerals in the attached drawings: 100-Adsorption tower, 110-Denitrification component, 111-First feed pipe, 112-Second feed pipe, 113-Air inlet, 120-Tower body, 101-Activated carbon; 20-Purge pipeline, 210-Main pipe, 211-Manual valve, 212-Electrically controlled valve, 220-Branch pipe. Detailed Implementation

[0021] To enable those skilled in the art to more clearly understand this application, the technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of the embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0022] According to the first aspect of this application, an activated carbon desulfurization and denitrification adsorption tower is provided, which can directly crush ammonium chloride particles into dust and move away from the adsorption tower along with the flue gas, thus ensuring the stability of the denitrification in the adsorption tower.

[0023] This application is described below with reference to the accompanying drawings and specific embodiments: Please see Figure 1 as well as Figure 2The online cleaning device for activated carbon desulfurization and denitrification adsorption tower 100 provided in this application embodiment includes an adsorption tower 100 and a jetting pipeline 20. The adsorption tower 100 includes a tower body 120 and a denitrification assembly 110 located within the tower body 120. The tower body 120 has a flue gas inlet and a flue gas outlet. The denitrification assembly 110 includes a first feed pipe 111 and a second feed pipe 112. Both the first feed pipe 111 and the second feed pipe 112 are conical. The larger end of the first feed pipe 111 is located outside the second feed pipe 112, and the smaller end of the first feed pipe 111 extends into the larger end of the second feed pipe 112. The outer wall of the first feeding pipe 111 is spaced from the inner wall of the large end of the second feeding pipe 112. The gap between the first feeding pipe 111 and the second feeding pipe 112 forms an annular air inlet 113. The air inlet 113 is connected to the flue gas inlet, and the flue gas outlet is connected to the large end of the first feeding pipe 111. Both the first feeding pipe 111 and the second feeding pipe 112 are used to contain activated carbon 101. The blowing pipeline 20 includes a blowing pipe and a nozzle. The air source, the blowing pipe and the nozzle are connected in sequence, and the nozzle is located at the air inlet 113.

[0024] The adsorption tower 100 is a flue gas desulfurization and denitrification structure. The tower body 120 of the adsorption tower 100 provides the installation foundation for the denitrification component 110 and the desulfurization structure. The flue gas inlet of the tower body 120 is at the bottom, and the flue gas outlet is at the top, with the overall flow direction of the flue gas being bottom in and top out. The first feed pipe 111 and the second feed pipe 112 of the denitrification component 110 are both conical, wider at the top and narrower at the bottom. The activated carbon 101 inside can slowly fall under its own weight and come into countercurrent contact with the upward flue gas to achieve denitrification.

[0025] The outer wall of the first feed pipe 111 and the inner wall of the second feed pipe 112 are spaced apart to form an annular air inlet 113. The outer wall of the first feed pipe 111 is connected to the tower body 120, and the outer wall of the second feed pipe 112 and the inner wall of the tower body 120 enclose a cavity for the flue gas to rise. The cavity is connected to the air inlet 113, so the flue gas rising from the lower part of the tower body 120 will fill the cavity and move downward through the annular air inlet 113 to the small end of the first feed pipe 111. Then it enters from the lower end of the first feed pipe 111 and moves upward to contact the activated carbon 101 inside the first feed pipe 111 for denitrification. Because the gap between the first feed pipe 111 and the second feed pipe 112, that is, the radial dimension of the annular air inlet 113, is too small, the ammonium chloride particles formed here easily accumulate and block the air inlet 113. By setting the nozzle at the annular air inlet 113, the ammonium chloride particles can be directly broken up and the dust can be moved away from the adsorption tower 100 along with the flue gas, thus ensuring the stability of the denitrification of the adsorption tower 100.

[0026] In some embodiments, the online cleaning device may include a control component, which includes a controller, a first pressure sensor for detecting the flue gas inlet of the adsorption tower 100, and a second pressure sensor for detecting the air outlet of the second feed pipe 112; an electrically controlled valve 212 is provided on the blow pipe, and the controller is electrically connected to the first pressure sensor, the second pressure sensor, and the valve.

[0027] When the annular inlet 113 is blocked, the flue gas cannot pass through easily. This will cause the gas pressure at the flue gas inlet of the adsorption tower 100 to be higher than the gas pressure at the flue gas outlet of the adsorption tower 100. When the pressure difference between these two locations is too large, it indicates that the annular inlet 113 is severely blocked. When the pressure difference between these two locations is not too large, it indicates that the annular inlet 113 is not severely blocked.

[0028] The first and second pressure sensors can send the gas pressure at the flue gas inlet and outlet of the adsorption tower 100 to the controller. The controller can then control the opening and closing of the electrically controlled valve 212 on the blowpipe based on these two pressures, thereby controlling the blowing cycle and duration of the blowing to the annular air inlet 113, ensuring that the annular air inlet 113 remains unobstructed as much as possible, and improving the flue gas treatment efficiency. The controller automatically controls the opening and closing of the electrically controlled valve 212, as well as the opening and closing time, based on the pressure difference, resulting in a high degree of automation.

[0029] The blowpipe can be made of high-temperature resistant steel, with a diameter of 25mm and a nozzle diameter of 2mm. In some embodiments, the blowpipe is equipped with a manual valve 211, which is closer to the air source than the electrically controlled valve 212. The manual valve 211 is normally open, and the opening and closing of the electrically controlled valve 212 is controlled by a controller to achieve automated control with high efficiency. In the event of a malfunction in the denitrification module, the manual valve 211 can be manually closed for maintenance, ensuring high reliability.

[0030] In some embodiments, please refer to Figure 1 as well as Figure 2 The denitrification assembly 110 is provided in multiple ways. The air inlets 113 of the multiple denitrification assemblies 110 are all connected to the flue gas inlet, and the air outlets of the multiple denitrification assemblies 110 are all connected to the flue gas outlet. The blowpipe includes a main pipe 210 and multiple branch pipes 220. The number of nozzles is the same as the number of branch pipes 220 and they correspond one-to-one. The input end of the main pipe 210 is connected to the air source. The multiple branch pipes 220 are connected in parallel to the output end of the main pipe 210. The nozzles are connected to the output ends of the corresponding branch pipes 220. Each denitrification assembly 110 has a corresponding nozzle at its air inlet 113.

[0031] Both the electrically controlled valve 212 and the manually operated valve 211 are located in the main pipe 210. By opening and closing the main pipe 210, the purging of multiple denitrification components 110 is controlled simultaneously. Each denitrification component 110 is equipped with a nozzle, which allows the air inlet 113 of each denitrification component 110 to be purged to break up the ammonium chloride particles.

[0032] In some embodiments, the tower body 120 may be provided with multiple processing chambers, such as two, three or five processing chambers, each processing chamber having a flue gas inlet and a flue gas outlet; the adsorption tower 100 includes denitrification modules that are the same number as the number of processing chambers and correspond one-to-one, the denitrification modules are located in the corresponding processing chambers, the denitrification modules include multiple denitrification components 110, the number of blowing pipes 20 is the same as the number of denitrification modules and corresponds one-to-one, and the nozzles of the blowing pipes 20 are located in the air inlet 113 of the corresponding denitrification module.

[0033] The adsorption tower 100 is equipped with multiple denitrification modules. Each denitrification module can operate independently by opening and closing the flue gas inlet of its corresponding treatment chamber. This ensures that even if one denitrification module malfunctions, the others can still denitrate the flue gas, guaranteeing the continuous operation of the adsorption tower 100. In practical implementation, the tower body 120 can be divided into multiple treatment chambers by internal partitions, each containing multiple denitrification components 110.

[0034] In some embodiments, please refer to Figure 1 as well as Figure 2 Each air inlet 113 has multiple nozzles distributed thereon, arranged sequentially along the circumference of the air inlet 113. The multiple nozzles are spaced apart along the circumference of the annular air inlet 113, allowing for spraying at multiple locations within the annular air inlet 113 with good spray uniformity. The distance between two adjacent nozzles can be 90mm~110mm, for example, 95mm, 97mm, 100mm, 102mm, 105mm, or 108mm.

[0035] Based on the same technical concept as the first aspect, the second aspect of this application provides an online cleaning method for an activated carbon desulfurization and denitrification adsorption tower 100.

[0036] The online cleaning method for the activated carbon desulfurization and denitrification adsorption tower 100 provided in this application embodiment is based on the online cleaning device of any embodiment of the first aspect.

[0037] The online cleaning method for activated carbon desulfurization and denitrification adsorption tower 100 provided in this application includes the following steps: Step 201: Clean the adsorption tower 100 by blowing air through the nozzle of the blowing pipeline 20 into the air inlet 113 of the adsorption tower 100 for a first set cycle and a set blowing duration. Step 202: Based on the first pressure at the flue gas inlet of the adsorption tower 100 and the second pressure at the flue gas outlet, control the cycle and duration of the blowing of air from the nozzle of the blowing pipeline 20 to the air inlet 113.

[0038] When the adsorption tower 100 is operating, flue gas enters through the flue gas inlet, first passes through the desulfurization module, then rises and mixes thoroughly with vaporized ammonia air, and continues to rise through the inlet 113 into the first feed pipe 111 for denitrification, before being discharged from the top of the first feed pipe 111 and exiting through the flue gas outlet. During this process, compressed air is blown into the inlet 113 through the nozzles of the injection pipe 20, a low-cost option. The compressed air is discharged from the nozzles and mixed with the flue gas, entering the first feed pipe 111 together. As the compressed air is ejected from the nozzles, the high-pressure air breaks up the ammonium chloride particles at the annular inlet 113, and the small particles of ammonium chloride move with the flue gas and are discharged from the flue gas outlet.

[0039] During the operation of the adsorption tower 100, the nozzles are first cleaned by blowing air at a first set cycle and a set blowing duration. If the first pressure at the flue gas inlet is too high and the second pressure at the flue gas outlet is too low during operation, it indicates that only a small amount of flue gas passes through the denitrification component 110, and ammonium chloride has coalesced and blocked the annular air inlet 113. Therefore, the blockage of the air inlet 113 can be judged based on the first and second pressures, and the blowing cycle and blowing duration are adjusted accordingly to ensure that the ammonium chloride in the air inlet 113 is cleared.

[0040] Specifically, in some embodiments, the cycle of blowing air from the nozzle of the injection pipeline 20 to the air inlet 113 is controlled based on a first pressure at the flue gas inlet of the adsorption tower 100 and a second pressure at the flue gas outlet, including: If the difference between the first pressure and the second pressure is greater than the set value, and the blowing cycle is greater than the second set cycle, the blowing cycle of the nozzle to the air inlet 113 is reduced; if the blowing cycle is not greater than the second set cycle, the blowing duration of the nozzle to the air inlet 113 is extended; the second set cycle is less than the first set cycle.

[0041] During the initial blowing cycle and duration, it was found that the difference between the first and second pressures was greater than the set value, indicating that the initial blowing cycle and duration were insufficient to resolve the blockage of the annular inlet 113. In this case, the blowing cycle of the nozzle to the inlet 113 could be reduced, i.e., the blowing frequency of the nozzle to the inlet 113 could be increased. This would potentially reduce the aggregation rate of ammonium chloride particles to a lower rate of breakage, thus opening the inlet 113. If reducing the blowing cycle to the inlet 113 to a certain extent still fails to open the inlet 113, meaning the difference between the first and second pressures remains greater than the set value, then extending the blowing duration of the nozzle to the inlet 113 should be considered. This would reduce the aggregation rate of ammonium chloride particles in the annular inlet 113 to a lower rate of breakage, thus opening the inlet 113 and ensuring the flue gas throughput.

[0042] Throughout the operation of the adsorption tower 100, the blowing pipeline 20 adjusts the blowing cycle and then the blowing duration based on the pressure difference. Specifically, when the pressure difference is too large, a short high-frequency blowing is used first; when the pressure difference is still below the set value, a long high-frequency blowing is used to break up the ammonium chloride particles. For the inlet 113, a short high-frequency blowing is used first, which loosens the ammonium chloride clusters through compressed air impact, preventing them from compacting and gradually weakening the adhesion between the ammonium chloride particles and the wall of the inlet 113, causing the ammonium chloride to suspend. Then, a long high-frequency blowing is used to break up a large number of small ammonium chloride particles, allowing them to be discharged with the flue gas; this method results in high efficiency in clearing blockages.

[0043] In some embodiments, the first set cycle can be 80-100 minutes, for example, 90 minutes, and the first blowing duration can be 8-12 seconds, for example, 10 seconds. The second set cycle can be 25-35 minutes, for example, 30 minutes, and the extended blowing duration can be 18-22 seconds, for example, 20 seconds. In some embodiments, the set value can be 1.2 kPa-1.7 kPa, for example, 1.5 kPa. The set value can also be determined based on the pressure difference when the adsorption tower 100 is clogged, and this application does not impose any limitations on it.

[0044] Before the improvement, the blockage of the air inlet 113 was cleaned manually. It was done once every three months, requiring 450 person-times. At a labor cost of 300 yuan per person per cleaning, the cost per cleaning was 135,000 yuan, and the annual cost was 540,000 yuan. Therefore, the online cleaning device and method proposed in this application saves 540,000 yuan per year in labor costs.

[0045] Based on the calculation that the maintenance time for cleaning the blockage of air inlet 113 increases by 12 hours compared to the normal maintenance time, the annual increase in maintenance time is 48 hours. One 360-square-meter sintering machine affects the output of sintered ore by 25,000 tons. Assuming the price difference between the production cost and the procurement cost of sintered ore is 50 yuan, the annual benefit is 12.5 million yuan. Therefore, adopting the online cleaning device and method of this application will increase the benefit by 12.5 million yuan per year.

[0046] In summary, the annual benefits of the online cleaning device and method of this application are approximately RMB 13 million.

[0047] The online cleaning device and method of this application can clean the NH4Cl blockage at the air inlet 113 of the adsorption tower 100 online, which solves the problems of offline cleaning requiring a lot of manpower and the main unit needing to be shut down for a long time, thus reducing the output. At the same time, it also solves the safety hazards of manual cleaning.

[0048] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature being directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature being directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0049] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", and "counterclockwise" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0050] In this application, unless otherwise expressly specified and limited, the terms "connection," "fixed," etc., should be interpreted broadly. For example, "fixed" can mean a fixed connection, a detachable connection, or an integral part; it can mean a mechanical connection or an electrical connection; it can mean a direct connection or an indirect connection through an intermediate medium; it can mean the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0051] Furthermore, the use of terms such as "first" and "second" in this application is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, features defined with "first" or "second" may explicitly or implicitly include one or more features. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0052] Although embodiments of this application have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of this application, the scope of which is defined by the claims and their equivalents.

Claims

1. An online cleaning device for activated carbon desulfurization and denitrification adsorption towers, characterized in that, include: An adsorption tower includes a tower body and a denitrification assembly located within the tower body. The tower body has a flue gas inlet and a flue gas outlet. The denitrification assembly includes a first feed pipe and a second feed pipe, both of which are conical. The larger end of the first feed pipe is located outside the second feed pipe, and the smaller end of the first feed pipe extends into the larger end of the second feed pipe. The outer wall of the smaller end of the first feed pipe is spaced from the inner wall of the larger end of the second feed pipe. The space between the first and second feed pipes forms an annular air inlet, which communicates with the flue gas inlet. The flue gas outlet communicates with the larger end of the first feed pipe. Both the first and second feed pipes are used to contain activated carbon. The jetting pipeline includes a jetting pipe and a nozzle, with the air source, the jetting pipe and the nozzle connected in sequence, and the nozzle located at the air inlet.

2. The online cleaning device for activated carbon desulfurization and denitrification adsorption towers according to claim 1, characterized in that, It also includes a control component, which includes a controller, a first pressure sensor for detecting the flue gas inlet of the adsorption tower, and a second pressure sensor for detecting the gas outlet of the second feed pipe. The blowpipe is equipped with an electrically controlled valve, and the controller is electrically connected to the first pressure sensor, the second pressure sensor, and the valve.

3. The online cleaning device for activated carbon desulfurization and denitrification adsorption towers according to claim 2, characterized in that, The blowpipe is equipped with a manual valve, which is closer to the air source than the electrically controlled valve.

4. The online cleaning device for activated carbon desulfurization and denitrification adsorption towers according to claim 1, characterized in that, The denitrification assembly is provided in multiple parts, and the air inlets of the multiple denitrification assemblies are all connected to the flue gas inlet, and the air outlets of the multiple denitrification assemblies are all connected to the flue gas outlet. The blowpipe includes a main pipe and multiple branch pipes. The number of nozzles is the same as the number of branch pipes and they correspond one-to-one. The input end of the main pipe is connected to the air source. The multiple branch pipes are connected in parallel to the output end of the main pipe. The nozzles are connected to the output ends of the corresponding branch pipes. Each air inlet of the denitrification component is provided with a corresponding nozzle.

5. The online cleaning device for activated carbon desulfurization and denitrification adsorption towers according to claim 4, characterized in that, The tower body is provided with multiple processing chambers, and each processing chamber is provided with a flue gas inlet and a flue gas outlet; The adsorption tower includes denitrification modules that are the same number as and correspond one-to-one with the processing chambers. The denitrification modules are located in the corresponding processing chambers, and each denitrification module includes multiple denitrification components. The number of the jetting pipes is the same as the number of the denitrification modules and they correspond one-to-one. The nozzles of the jetting pipes are located inside the air inlet of the corresponding denitrification module.

6. The online cleaning device for activated carbon desulfurization and denitrification adsorption towers according to claim 4, characterized in that, Each air inlet has multiple nozzles distributed thereon, and the multiple nozzles are arranged sequentially along the circumference of the air inlet; the distance between two adjacent nozzles is 90mm~110mm.

7. An online cleaning method for an online cleaning device for an activated carbon desulfurization and denitrification adsorption tower based on any one of claims 1-6, characterized in that, include: The air is blown into the air inlet of the adsorption tower through the nozzles of the blow-through pipeline for a first set cycle and a set blowing duration. Based on the first pressure at the flue gas inlet of the adsorption tower and the second pressure at the flue gas outlet, the cycle and duration of the blowing of air from the nozzle of the blowing pipeline to the air inlet are controlled.

8. The online cleaning method for activated carbon desulfurization and denitrification adsorption towers according to claim 7, characterized in that, Based on the first pressure at the flue gas inlet of the adsorption tower and the second pressure at the flue gas outlet, the cycle of blowing air from the nozzles of the jet pipeline to the air inlet is controlled, including: If the difference between the first pressure and the second pressure is greater than a set value, and the blowing cycle is greater than the second set cycle, then the blowing cycle of the nozzle to the air inlet is reduced; if the blowing cycle is not greater than the second set cycle, then the blowing duration of the nozzle to the air inlet is extended; the second set cycle is less than the first set cycle.

9. The online cleaning method for activated carbon desulfurization and denitrification adsorption towers according to claim 7, characterized in that, The first set cycle is 80min~100min, and the first blowing duration is 8s~12s.

10. The online cleaning method for activated carbon desulfurization and denitrification adsorption towers according to claim 7, characterized in that, The set value is 1.2 kPa to 1.7 kPa.

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