Drying, activating and calcining integrated method for regenerating SCR (Selective Catalytic Reduction) denitration catalyst

Abstract

The embodiment of the invention provides a drying, activating and calcining integrated method for regeneration of an SCR (Selective Catalytic Reduction) denitration catalyst. The method comprises the following steps: cleaning an SCR catalyst module; performing drying air heat treatment on the cleaned SCR catalyst module; the dried SCR catalyst module is subjected to activation liquid atomization spraying treatment; and carrying out calcining wind heat treatment on the SCR catalyst module sprayed with the activating solution. According to the method disclosed by the invention, the SCR catalyst module does not need to be cooled after being subjected to drying air heat treatment, and the activating agent can be directly sprayed through the spraying mechanism, so that the cooling time after the SCR catalyst module is dried is saved, the regeneration efficiency of the SCR catalyst module is improved, meanwhile, the cooling step of a drying area on the SCR catalyst module is reduced, and the regeneration efficiency of the SCR catalyst module is improved. And the energy consumption in the whole regeneration process of the SCR catalyst can be reduced.

Description

Technical Field

[0001] The embodiments of the present disclosure belong to the technical field of catalyst regeneration, and specifically relate to an integrated drying, activation and calcination method for regenerating an SCR denitration catalyst. Background Art

[0002] SCR denitration catalyst regeneration is a widely used catalyst efficiency improvement technology. Its main principle is to remove factors that limit denitration activity and replenish active substances in the catalyst matrix to restore catalyst activity. The regeneration process generally includes catalyst cleaning, chemical cleaning, catalyst drying, activation loading, high-temperature calcination (300-400°C), unpacking and repair, and packaging.

[0003] The typical process of catalyst module drying, activation loading, and high-temperature calcination is divided into three steps. After the catalyst is cleaned, the wet catalyst module enters a drying oven for drying. Heating evaporates the water in the catalyst module, reducing its water content. The dried catalyst module is then immersed in an activation loading liquid, where it absorbs the liquid and implants the active intermediate. During the high-temperature calcination step, the water in the loading liquid evaporates, leaving the active intermediate in the catalyst matrix. Once the water is evaporated, further heating is performed, ultimately transforming the active intermediate into catalytically active sites that are dispersed throughout the catalyst.

[0004] In the prior art, the wet catalyst module is heated during the drying process to evaporate the water, then cooled before being immersed in the activated load. After activation, the wet module is heated again to evaporate the water until the high temperature causes the active material intermediate to decompose. Each wet module contains 150-200 kg of water. The entire process requires two steps to completely evaporate the water from the catalyst module, which requires a large amount of heat. This results in high energy consumption, long processing time, low production efficiency, and complex operations. Summary of the Invention

[0005] The embodiments of the present disclosure aim to solve at least one of the technical problems existing in the prior art and provide an integrated drying, activation and calcination method for regenerating an SCR denitration catalyst.

[0006] A first aspect of the present disclosure provides an integrated drying, activation and calcination method for regenerating an SCR denitration catalyst, the method comprising:

[0007] Clean the SCR catalyst module;

[0008] Perform dry air heat treatment on the cleaned SCR catalyst module;

[0009] The dried SCR catalyst module is treated with an activation liquid atomization spray;

[0010] The SCR catalyst module after being sprayed with the activation liquid is subjected to calcination and wind heat treatment.

[0011] In some embodiments of the present disclosure, the atomizing and spraying treatment of the activation liquid on the dried SCR catalyst module specifically includes:

[0012] The dried SCR catalyst module is subjected to the first activation liquid atomization spray treatment;

[0013] Performing a second activation liquid atomization spray treatment on the SCR catalyst module after the first activation liquid atomization spray treatment;

[0014] Wherein, the spraying direction of the first activation liquid atomization spraying treatment is opposite to the spraying direction of the second activation liquid atomization spraying treatment.

[0015] In some embodiments of the present disclosure, the spraying direction of the first activation liquid atomization spraying treatment and the spraying direction of the second activation liquid atomization spraying treatment are both along the extension direction of the holes of the SCR catalyst module.

[0016] In some embodiments of the present disclosure, the circulating wind direction of the drying wind heat treatment is the same as the spray direction of the first activation liquid atomization spray treatment, and the circulating wind direction of the calcining wind heat treatment is the same as the spray direction of the second activation liquid atomization spray treatment.

[0017] In some embodiments of the present disclosure, the drying and wind-heating treatment of the cleaned SCR catalyst module specifically includes:

[0018] Perform the first hot air heating on the cleaned SCR catalyst module;

[0019] Performing a second hot air heating on the SCR catalyst module after the first hot air heating;

[0020] The SCR catalyst module after the second hot air heating is subjected to a third hot air heating;

[0021] The temperature of the first hot air heating is less than or equal to the temperature of the second hot air heating, and the temperature of the second hot air heating is less than or equal to the temperature of the third hot air heating.

[0022] In some embodiments of the present disclosure, the temperature range of the first hot air heating is 120°C to 160°C, and the circulating air volume range of the first hot air heating is 20m 3 / min~30m 3 / min;

[0023] The temperature range of the second hot air heating is 160℃~180℃, and the circulating air volume range of the second hot air heating is 15m 3 / min~22m 3 / min;

[0024] The temperature range of the third hot air heating is 200℃~220℃, and the circulating air volume range of the third hot air heating is 10m 3 / min~15m 3 / min.

[0025] In some embodiments of the present disclosure, the calcining and wind-heating treatment of the SCR catalyst module after spraying the activation liquid specifically includes:

[0026] The SCR catalyst module after spraying the activation liquid is subjected to the first calcination by air heating;

[0027] The SCR catalyst module after the first calcination and wind heating is subjected to a second calcination and wind heating;

[0028] The SCR catalyst module after the second calcination and wind heating is subjected to a third calcination and wind heating;

[0029] The temperature of the first calcination by wind heat is less than or equal to the temperature of the second calcination by wind heat, and the temperature of the second calcination by wind heat is less than or equal to the temperature of the third calcination by wind heat.

[0030] In some embodiments of the present disclosure, the temperature range of the first hot air heating is 160°C to 180°C, and the circulating air volume range of the first hot air heating is 12m 3 / min~18m 3 / min;

[0031] The temperature range of the second hot air heating is 260℃~280℃, and the circulating air volume range of the second hot air heating is 10m 3 / min~15m 3 / min;

[0032] The temperature range of the third hot air heating is 320℃~360℃, and the circulating air volume range of the third hot air heating is 8m 3 / min~12m 3 / min.

[0033] In some embodiments of the present disclosure, the circulating hot air from a portion of the calcination wind thermal treatment is used for the dry wind thermal treatment.

[0034] In a second aspect, the present disclosure provides an integrated drying, activation and calcination device for regenerating an SCR denitration catalyst, which is used to implement the integrated drying, activation and calcination method for regenerating an SCR denitration catalyst according to any of the above embodiments.

[0035] The drying, activation and calcination integrated equipment for regenerating the SCR denitration catalyst includes a tunnel furnace body and a carrier vehicle cooperating with the tunnel furnace body. Along the moving direction of the carrier vehicle, the tunnel furnace body includes a drying zone, a regeneration zone and a calcination zone in sequence;

[0036] The drying area is provided with a drying heating mechanism and a drying air circulation mechanism;

[0037] The regeneration area is provided with an activation spray mechanism and a regeneration air circulation mechanism;

[0038] The calcination zone is provided with a calcination heating mechanism and a calcination air circulation mechanism, and the exhaust port of the calcination air circulation mechanism is communicated with the air inlet of the drying air circulation mechanism.

[0039] In the integrated drying, activation and calcination method for regenerating an SCR denitration catalyst according to the disclosed embodiment, the SCR catalyst module does not need to be cooled after being dried and thermally treated, and an activator can be directly sprayed through a spray mechanism, thereby saving the cooling time of the SCR catalyst module after drying and improving the regeneration efficiency of the SCR catalyst module. At the same time, the cooling steps of the SCR catalyst module in the drying area are reduced, which can reduce the energy consumption in the entire process of SCR catalyst regeneration. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] Figure 1 Flowchart of the integrated drying, activation and calcination method for regenerating an SCR denitration catalyst according to the disclosed embodiment;

[0041] Figure 2 Schematic diagram of the structure of the drying, activation and calcination integrated equipment for regeneration of SCR denitration catalyst according to an embodiment of the present disclosure;

[0042] Figure 3 for Figure 2 A schematic diagram of a portion of the structure of an integrated drying, activation and calcination device for regeneration of an SCR denitration catalyst is shown;

[0043] Figure 4 for Figure 3 Axonometric view of the regeneration zone structure shown;

[0044] Figure 5 for Figure 3 A front view of the regeneration zone structure shown;

[0045] Figure 6 for Figure 3Schematic diagram of part of the structure of the activation spray mechanism shown.

[0046] The reference numerals in the accompanying drawings represent the following:

[0047] 1. Drying air inlet valve; 2. Drying air exhaust valve; 3. Calcination air inlet valve; 4. Calcination air exhaust valve; 5. Waste heat circulation branch valve; 6. Waste heat circulation main valve; 7. Regeneration air inlet valve; 8. Regeneration air exhaust valve; 11. Bypass valve; 12. Check valve; 13. Drying circulation fan; 131. Drying air inlet pipe; 132. Drying air exhaust pipe; 14. Calcination circulation fan; 141. Calcination air inlet pipe; 142. Calcination air exhaust pipe; 15. Regeneration circulation fan; 1 51. Regeneration intake pipe; 152. Regeneration exhaust pipe; 16. Activation liquid supply pump; 17. Activation spray mechanism; 172. Activation liquid nozzle; 173. Slide rail; 174. Slider; 18. Drying temperature sensor; 19. Regeneration temperature sensor; 20. Calcination temperature sensor; 21. Exhaust gas purifier; 23. Weighing device; 25. SCR catalyst module; 26. Carrier vehicle; 27. Drying heating mechanism; 28. Calcination heating mechanism;

[0048] 30. Tunnel furnace body; 31. Wind shield; 301. Drying zone; 302. Regeneration zone; 303. Calcination zone;

[0049] 41. Fairing; 42. Rectifier. DETAILED DESCRIPTION

[0050] Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. Although exemplary embodiments of the present disclosure are shown in the accompanying drawings, it should be understood that the present disclosure can be implemented in various forms and should not be limited by the embodiments described herein. Rather, these embodiments are provided to enable a more thorough understanding of the present disclosure and to fully convey the scope of the present disclosure to those skilled in the art.

[0051] It should be understood that the terms used herein are for the purpose of describing specific example embodiments only and are not intended to be limiting. Unless the context clearly indicates otherwise, the singular forms "one", "an" and "said" as used herein may also be meant to include plural forms. The terms "comprise", "include", "contain" and "have" are inclusive and therefore specify the presence of stated features, steps, operations, elements and / or parts, but do not exclude the presence or addition of one or more other features, steps, operations, elements, parts, and / or combinations thereof. The method steps, processes, and operations described herein are not to be construed as necessarily requiring them to be performed in the specific order described or illustrated, unless the order of execution is clearly indicated. It should also be understood that additional or alternative steps may be used.

[0052] Although the terms first, second, third, etc. can be used in the text to describe multiple elements, components, regions, layers and / or sections, these elements, components, regions, layers and / or sections should not be limited by these terms. These terms can only be used to distinguish an element, component, region, layer or section from another region, layer or section. Unless the context clearly indicates otherwise, terms such as "first", "second" and other numerical terms do not imply order or sequence when used in the text. Therefore, the first element, component, region, layer or section discussed below can be referred to as the second element, component, region, layer or section without departing from the teaching of the example embodiments.

[0053] For ease of description, spatially relative terms may be used herein to describe the relationship of one element or feature relative to another element or feature as shown in the figures, such as "inside", "outside", "inside", "outside", "below", "beneath", "above", "over", etc. Such spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is flipped, then an element described as "below" or "below" other elements or features would then be oriented as "above" or "above" other elements or features. Thus, the example term "below" can include both above and below orientations. The device can be oriented otherwise (rotated 90 degrees or in other orientations) and the spatially relative descriptors used herein are interpreted accordingly.

[0054] like Figures 2 to 6 As shown, the first aspect of the present disclosure provides an integrated drying, activation and calcining device for regenerating an SCR denitration catalyst, which is used for regenerating an SCR catalyst module 25. The integrated drying, activation and calcining device for regenerating an SCR denitration catalyst includes a tunnel furnace body 30 and a carrier vehicle 26 cooperating with the tunnel furnace body 30. Along the moving direction of the carrier vehicle 26, the tunnel furnace body 30 includes a drying zone 301, a regeneration zone 302 and a calcining zone 303 in sequence; wherein, the drying zone 301 is provided with a drying heating mechanism 27 and a drying air circulation mechanism; the regeneration zone 302 is provided with an activation spray mechanism 17 and a regeneration air circulation mechanism; the calcining zone 303 is provided with a calcining heating mechanism 28 and a calcining air circulation mechanism, and the exhaust port of the calcining air circulation mechanism is connected to the air inlet of the drying air circulation mechanism.

[0055] According to the integrated drying, activation and calcining equipment for regenerating the SCR denitration catalyst disclosed in the present invention, it includes a tunnel furnace body 30 and a carrier vehicle 26. The carrier vehicle 26 carries the SCR catalyst module 25 and moves in different working areas of the tunnel furnace body 30 to perform drying, regeneration and calcination processes on the SCR catalyst module 25. Specifically, along the moving direction of the carrier vehicle 26, the tunnel furnace body 30 includes a drying area 301, a regeneration area 302 and a calcination area 303 in sequence. The carrier vehicle 26 carries the cleaned SCR catalyst module 25 and enters the drying area 301 of the tunnel furnace body 30. The drying air circulation mechanism of the drying area 301 controls the air circulation of the drying area 301. The drying heating mechanism 27 heats the air in the drying area 301. The heated air forms circulating hot air in the drying area 301 under the action of the drying air circulation mechanism. The circulating hot air forms convection heat transfer with the SCR catalyst module 25 in the drying zone 301, thereby taking away the moisture in the SCR catalyst module 25 and achieving the drying process of the SCR catalyst module 25; after the SCR catalyst module 25 is dried, the carrier vehicle 26 carries the SCR catalyst module 25 into the regeneration zone 302, and the activation spraying mechanism 17 sprays the activator atomized on the SCR catalyst module 25 in the regeneration zone 302, so that the activator is sprayed on the SCR catalyst module 25. At the same time, the regeneration air circulation mechanism controls the The air in the regeneration zone 302 is circulated to form a circulating wind in the regeneration zone 302. The circulating wind blows the atomized activator toward the SCR catalyst module 25 so that the activator is evenly distributed on the surface and in the pores of the SCR catalyst module 25. After the SCR catalyst module 25 is regenerated, the carrier vehicle 26 carries the SCR catalyst module 25 into the calcining zone 303. The calcining wind circulation mechanism in the calcining zone 303 controls the air in the calcining zone 303 to circulate. The calcining heating mechanism 28 heats the air in the calcining zone 303. The heated air forms circulating hot air in the calcining zone 303 under the action of the calcining air circulation mechanism. The circulating hot air forms convection heat transfer with the SCR catalyst module 25 in the calcining zone 303. After the SCR catalyst module 25 is heated, the water in the activation liquid on the SCR catalyst module 25 is evaporated by the heat, and the active material intermediate remains on the surface of the SCR catalyst module 25. As the temperature in the calcining zone 303 continues to rise, the activated material intermediate begins to decompose, and finally forms the target active material, so that the catalyst activity is restored.

[0056] The integrated drying, activation and calcination equipment for regenerating the SCR denitration catalyst in the embodiment of the present disclosure integrates a drying zone 301, a regeneration zone 302 and a calcination zone 303, which can reduce the distance between the transfers of the SCR catalyst module 25 between the various processes during the regeneration process, thereby reducing the transfer time. At the same time, the mechanism of the drying zone 301 of the integrated drying, activation and calcination equipment for regenerating the SCR denitration catalyst in this embodiment does not need to be cooled after the air-heat treatment of the SCR catalyst module 25, and can directly enter the regeneration zone 302 to be sprayed with an activator through a spray mechanism, thereby saving the cooling time of the SCR catalyst module 25 after drying and improving the regeneration efficiency of the SCR catalyst module 25. At the same time, reducing the cooling step of the SCR catalyst module 25 in the drying zone 301 can reduce the energy consumption in the entire process of SCR catalyst regeneration. In addition, the exhaust port of the calcining air circulation mechanism of the calcining zone 303 is connected to the air inlet of the drying air circulation mechanism of the drying zone 301, and the hot air of the calcining air circulation mechanism can be introduced into the drying air circulation mechanism, thereby improving the utilization rate of the waste heat of the calcining zone 303 and reducing the energy consumption during the regeneration process of the SCR catalyst.

[0057] Specifically, the tunnel furnace body 30 comprises a rectangular, monolithic frame structure welded from section steel. This frame serves as the furnace shell, to which steel plates are welded to form the exterior. Refractory bricks are installed within the shell, and corners and gaps are filled with refractory slurry and refractory fiber. The insulation material, comprising refractory bricks, refractory slurry, and refractory fiber, has an installation thickness of ≥300mm. A support frame, also welded from section steel, is located at the bottom of the tunnel furnace body 30. This frame provides the strength and rigidity required to maintain stable furnace operation.

[0058] In some embodiments of the present disclosure, the drying zone 301 is provided with a drying and heating mechanism 27 and a drying air circulation mechanism, wherein the drying and heating mechanism 27 is provided on the furnace body of the drying zone 301, that is, the drying and heating mechanism 27 is provided on the portion of the tunnel furnace body 30 that corresponds to the drying zone 301. The drying and heating mechanism 27 heats the air in the drying zone 301, and the hot air in the drying zone 301 is circulated through the drying air circulation mechanism, thereby heating the SCR catalyst module 25 in the drying zone 301. Specifically, before the drying and heating mechanism 27 heats the air in the drying zone 301, the drying air circulation mechanism can be activated to circulate the air in the drying zone 301, and then the drying and heating mechanism 27 can be activated to heat the circulating air, thereby achieving hot air circulation in the drying zone 301.

[0059] Specifically, the tunnel furnace body 30 includes at least two drying zones 301, which are connected in sequence to achieve multiple drying cycles for the SCR catalyst module 25, ensuring complete evaporation of moisture from the SCR catalyst module 25. The heating temperature of at least two drying zones 301 increases sequentially along the direction of movement of the carrier 26, ensuring complete evaporation of moisture from the SCR catalyst module 25. Each drying zone 301 is equipped with an independent drying heating mechanism 27 and a drying air circulation mechanism to independently control the temperature and air speed of each drying zone 301, enabling precise regulation of the temperature and air speed in each drying zone 301 and reducing energy waste. In this embodiment, there are three drying zones 301, which are arranged sequentially along the direction of movement of the carrier 26. The heating temperature of each drying zone 301 increases sequentially. Furthermore, the circulating air in each of the three drying zones 301 flows in the same direction. In other embodiments, the number of drying zones 301 may be two, four, five, six, seven, eight, nine, or more.

[0060] The drying heating mechanism 27 can be a resistance wire heater or a gas heater. The drying air circulation mechanism includes a drying circulation fan 13 and a drying circulation air duct. The drying circulation fan 13 is located on the side wall of the drying area 301. The drying circulation air duct is connected to the drying area 301. The drying circulation fan 13 is located on the drying circulation air duct and circulates the air in the drying area 301 within the drying circulation air duct and the drying area 301. Specifically, the drying circulation air duct includes a drying air inlet duct 131 and a drying exhaust duct 132. The drying air inlet duct 131 is connected to the drying exhaust duct 132, and the drying air inlet duct 131 is connected to the air inlet of the drying area 301, and the drying exhaust duct 132 is connected to the air outlet of the drying area 301. The drying circulation fan 13 is arranged on the drying air inlet duct 131. The drying circulation fan 13 allows the wind from the drying air inlet duct 131 to enter the drying area 301 through the air inlet, and the drying circulation fan 13 allows the wind from the drying exhaust duct 132 to enter the drying air inlet duct 131, so that the wind in the drying area 301 flows toward the drying exhaust duct 132, so that the air in the drying area 301 forms a cycle between the drying area 301, the drying exhaust duct and the drying air inlet duct.

[0061] The drying air circulation mechanism also includes a fairing 41. A fairing 41 is provided at both the outlet and return ends of the drying circulation air duct. The drying air inlet duct 131 connects to the air inlet of the drying zone 301 through one fairing 41, and the combustion exhaust duct connects to the exhaust of the drying zone 301 through another fairing 41. A rectifier 42 is also provided at one end of the exhaust. This rectifier 42 is positioned near the fairing 41 at one end of the exhaust. Air flows through the rectifier 42 and the fairing 41 at the exhaust end, sequentially along the direction of air flow in the drying zone 301. Specifically, the fairing 41 and rectifier 42 are located on the sidewalls of the drying zone 301.

[0062] Furthermore, a drying air inlet valve 1 is provided on the drying air inlet pipe 131, and a drying air exhaust valve 2 is provided on the drying air exhaust pipe 132. By controlling the opening of the drying air inlet valve 1 and the drying air exhaust valve 2, the air volume entering the drying zone 301 from the drying air inlet pipe 131 can be precisely controlled, thereby controlling the temperature and humidity within the drying zone 301. Specifically, a drying temperature sensor 18 is provided in the drying zone 301. The opening of the drying air inlet valve 1 and the drying air exhaust valve 2 are precisely controlled based on the temperature detected by the drying temperature sensor 18. The drying circulation air duct is also equipped with a check valve 12 and a bypass valve 11.

[0063] In some embodiments of the present disclosure, the regeneration zone 302 is provided with an activation spray mechanism 17 and a regeneration air circulation mechanism. The activation liquid spray head 172 of the activation spray mechanism 17 is located within the regeneration zone 302 to spray the SCR catalyst module 25 in the regeneration zone 302. The regeneration air circulation mechanism is provided in the regeneration zone 302 to circulate air within the regeneration zone 302. The air flow within the regeneration zone 302 allows the activation liquid sprayed by the activation spray mechanism 17 to be more evenly distributed on the SCR catalyst module 25.

[0064] Specifically, an air inlet and an air outlet are provided on opposite sides of the regeneration zone 302. The air inlet and the air outlet are respectively connected to the regeneration air circulation mechanism. The regeneration air circulation mechanism allows air to enter the regeneration zone 302 from the air inlet, flow to the air outlet of the regeneration zone 302, and then flow back to the air inlet from the air outlet, thereby forming an air circulation. The activation spray mechanism 17 is provided at the air inlet of the regeneration zone 302. Air enters the regeneration zone 302 from the air inlet and flows toward the air outlet of the regeneration zone 302. During the flow of air, the activation liquid sprayed by the activation spray mechanism 17 is blown toward the air outlet, so that the activation liquid can flow along the direction from the air inlet to the air outlet, that is, along the extension direction of the holes of the SCR catalyst module 25, so that the activation liquid is more evenly distributed on the surface and in the holes of the SCR catalyst module 25.

[0065] Specifically, the activation spray mechanism 17 includes an activation liquid storage tank and an activation liquid spray head 172. The activation liquid storage tank stores the activator for the SCR catalyst. The activation liquid spray head 172 is connected to the activation liquid storage tank. The SCR catalyst activator in the activation liquid storage tank enters the activation liquid spray head 172 and is sprayed toward the SCR catalyst module 25, thereby distributing the activator on the SCR catalyst module 25. Specifically, the activation liquid spray head 172 is located at the air inlet of the regeneration zone 302 and faces the air outlet of the regeneration zone 302. Under the action of the regeneration air circulation mechanism, circulating air enters the regeneration zone 302 from the air inlet and flows toward the air outlet. During the flow of the circulating air, the activation liquid sprayed from the activation liquid spray head 172 at the air inlet is blown toward the air outlet, so that the activation liquid flows along the direction of the holes of the SCR catalyst module 25, thereby evenly distributing the activation liquid on the surface and within the holes of the SCR catalyst module 25. Furthermore, the activation spray mechanism 17 also includes an activation liquid supply pump 16 , which controls the activation liquid in the activation liquid storage tank to enter the activation liquid nozzle 172 through a pipeline, so that the activation liquid can be sprayed out from the activation liquid nozzle 172 .

[0066] In some embodiments of the present disclosure, the activation spray mechanism 17 further includes a slide rail 173 and a slider 174. The slide rail 173 is positioned near the air inlet of the regeneration zone 302 and extends along the length of the tunnel furnace body 30. The slider 174 is slidably connected to the slide rail 173 and is connected to the activation liquid spray head 172. The slider 174 drives the activation liquid spray head 172 to reciprocate along the length of the tunnel furnace body 30 to spray different positions of the SCR catalyst module 25, thereby evenly distributing the activation liquid on the surface and within the pores of the SCR catalyst module 25.

[0067] In some embodiments of the present disclosure, the activation liquid spray head 172 includes multiple liquid outlets that are spaced and evenly arranged along the height of the tunnel furnace body 30. Spraying the activation liquid onto the SCR catalyst module 25 through multiple spaced and evenly arranged liquid outlets can improve spraying efficiency and ensure uniform distribution of the activation liquid along the height of the SCR catalyst module 25.

[0068] In some embodiments of the present disclosure, the activation spray mechanism 17 further includes: a weighing device 23 , which is provided in the activation liquid storage tank and is used to weigh the activation liquid storage tank to obtain the spraying amount of the activation liquid.

[0069] In some embodiments of the present disclosure, the regeneration zone 302 further includes an exhaust gas purifier 21 , which is located at one end of the regeneration zone 302 near the exhaust port and is used to collect activation liquid that is not absorbed by the SCR catalyst module 25 to reduce the pollution of the activation liquid to the environment.

[0070] Due to the loss of the sprayed activated loading liquid particles, not all of the activated loading liquid can be absorbed by the catalyst. The total content of active substances that enter and are fixed inside the catalyst will be lower than the calculated value. Therefore, when calculating the required mass of the sprayed loading liquid, it is necessary to multiply it by the absorption coefficient of the activated loading liquid particles.

[0071] Under the control of the processor, slider 174, carrying the activation liquid atomizing spray head, reciprocates on the guide rail, spraying the activation liquid evenly into the channels of the SCR catalyst module 25 until the activation liquid spray volume reaches the designed value. The loading liquid is composed of active material intermediates such as vanadium, tungsten, molybdenum, and cerium. Its formulation is designed using catalyst regeneration calculation software based on catalyst parameters, design flue gas conditions, and desired performance requirements. The loading liquid concentration is adjusted according to the principle of total loading control.

[0072] The absorption coefficient of the activated loading liquid can be calculated by the following test. According to theoretical calculation, the total mass of the active substance in the activated loading liquid sprayed is A. The mass fraction of the active substance in the catalyst is increased by β by XRF (X-ray fluorescence spectrometer). The total mass of the catalyst is B. In production, the target mass to be added to the catalyst is C and the mass of the activated loading liquid to be sprayed is D. Then

[0073]

[0074] In some embodiments of the present disclosure, the regeneration zone 302 is provided with a regeneration air circulation mechanism, which includes: a regeneration circulation fan 15 and a regeneration circulation air duct. The regeneration circulation fan 15 is provided on the side wall of the regeneration zone 302, and the regeneration circulation air duct is connected to the regeneration zone 302. The regeneration circulation fan 15 is provided on the regeneration circulation air duct, and the regeneration circulation fan 15 causes the air in the regeneration zone 302 to circulate in the regeneration circulation air duct and the regeneration zone 302. Specifically, the regeneration circulation air duct includes a regeneration air inlet duct 151 and a regeneration exhaust duct 152. The regeneration air inlet duct 151 is connected to the regeneration exhaust duct 152, and the regeneration air inlet duct 151 is connected to the air inlet of the regeneration zone 302, and the regeneration exhaust duct 152 is connected to the exhaust of the regeneration zone 302. The regeneration circulation fan 15 is arranged on the regeneration air inlet duct 151. The regeneration circulation fan 15 allows the wind from the regeneration air inlet duct 151 to enter the regeneration zone 302 through the air inlet, and the regeneration circulation fan 15 allows the wind from the regeneration exhaust duct 152 to enter the regeneration air inlet duct 151, so that the wind from the regeneration zone 302 flows to the regeneration exhaust duct 152, so that the air in the regeneration zone 302 forms a circulation between the regeneration zone 302, the regeneration exhaust duct and the regeneration air inlet duct.

[0075] The regeneration air circulation mechanism also includes a fairing 41. A fairing 41 is provided at both the outlet and return ends of the regeneration circulation air duct. The regeneration air intake duct 151 connects to the air inlet of the regeneration zone 302 through one fairing 41, and the combustion exhaust duct connects to the exhaust of the regeneration zone 302 through another fairing 41. A rectifier 42 is also provided at one end of the exhaust. The rectifier 42 is positioned near the fairing 41 at one end of the exhaust. Air flows through the rectifier 42 and the fairing 41 at the exhaust end, sequentially along the direction of air flow in the regeneration zone 302. Specifically, the fairing 41 and rectifier 42 are located on the sidewalls of the regeneration zone 302.

[0076] Furthermore, a regeneration intake valve 7 is provided on the regeneration intake pipe 151, and a regeneration exhaust valve 8 is provided on the regeneration exhaust pipe 152. By controlling the opening of the regeneration intake valve 7 and the regeneration exhaust valve 8, the amount of air entering the regeneration zone 302 through the regeneration intake pipe 151 can be precisely controlled, thereby controlling the temperature and humidity within the regeneration zone 302. Specifically, a regeneration temperature sensor 19 is provided in the regeneration zone 302, and the opening of the regeneration intake valve 7 and the regeneration exhaust valve 8 are precisely controlled based on the temperature detected by the regeneration temperature sensor 19.

[0077] In some embodiments of the present disclosure, the tunnel furnace body 30 includes at least two regeneration zones 302, which are sequentially connected. Specifically, at least two regeneration zones 302 are connected between the drying zone 301 and the calcining zone 303. This ensures sufficient activation of the SCR catalyst module 25 and sufficient adhesion of the catalyst to the surface and pores of the SCR catalyst module 25. In this embodiment, there are two regeneration zones 302. The first and second regeneration zones 302 are sequentially connected along the direction of movement of the carrier 26. In other embodiments, the number of regeneration zones 302 may be two, four, five, six, seven, eight, nine, or more.

[0078] Specifically, each regeneration zone 302 is provided with an independent activation liquid spraying mechanism and a regeneration air circulation mechanism to achieve independent control of the spraying amount and wind speed of the spraying liquid in each regeneration zone 302, thereby reducing energy waste.

[0079] In some embodiments of the present disclosure, the circulating air flows in opposite directions between two adjacent regeneration zones 302. That is, the air inlets of the two adjacent regeneration zones 302 are in opposite directions, and the air outlets of the two adjacent regeneration zones 302 are in opposite directions. Each regeneration zone 302 has an activation liquid nozzle 172 at its air inlet, and the activation liquid nozzle 172 is oriented from the air inlet to the air outlet. Therefore, the activation liquid nozzles 172 in two adjacent regeneration zones are oriented in opposite directions. When the carrier vehicle 26 carries the SCR catalyst module 25 into the first regeneration zone 302, the activation liquid nozzle 172 of the first regeneration zone 302 sprays activation liquid from the first end of the hole of the SCR catalyst module 25. After the activation liquid spraying of the first regeneration zone 302 is completed, when the carrier vehicle 26 carries the SCR catalyst module 25 into the second regeneration zone 302, the activation liquid nozzle 172 of the second regeneration zone 302 sprays activation liquid from the second end of the hole of the SCR catalyst module 25. The first end and the second end are the opposite ends of the hole of the SCR catalyst module 25, that is, the spray liquid of the first regeneration zone 302 enters the hole from the first end of the hole of the SCR catalyst module 25 and flows or moves along the direction of the hole toward the second end of the hole. The spray liquid of the second regeneration zone 302 enters the hole from the second end of the hole of the SCR catalyst module 25 and flows or moves along the direction of the hole toward the first end of the hole, so that the spray liquid can completely cover the surface of the hole, so that the catalyst on the surface of the hole is more fully attached. The number of regeneration zones 302 in this embodiment is two. When the embodiment includes more than two regeneration zones 302, the directions of the circulating air in two adjacent regeneration zones 302 are opposite, and the directions of the activation liquid nozzles 172 in two adjacent regeneration zones 302 are opposite.

[0080] In some embodiments of the present disclosure, the flow direction of the circulating air in the drying zone 301 is the same as the flow direction of the circulating air in the adjacent regeneration zone 302, and the flow direction of the circulating air in the calcining zone 303 is the same as the flow direction of the circulating air in the adjacent regeneration zone 302. That is, the flow direction of the circulating air in the drying zone 301 is the same as the flow direction of the circulating air in the first regeneration zone 302, and the flow direction of the circulating air in the calcining zone 303 is the same as the flow direction of the circulating air in the second regeneration zone 302, so as to stabilize the flow field in the tunnel furnace body 30 and reduce turbulence.

[0081] In some embodiments of the present disclosure, the calcination zone 303 is provided with a calcination heating mechanism 28 and a calcination air circulation mechanism. The calcination heating mechanism 28 is provided on the furnace body of the calcination zone 303, that is, the calcination heating mechanism 28 is provided on the portion of the tunnel furnace body 30 corresponding to the calcination zone 303. The calcination heating mechanism 28 heats the air in the calcination zone 303, and the calcination air circulation mechanism circulates the hot air in the calcination zone 303, thereby heating the SCR catalyst module 25 in the calcination zone 303. Specifically, before the calcination heating mechanism 28 heats the air in the calcination zone 303, the calcination air circulation mechanism can be started to form circulating air in the calcination zone 303, and then the calcination heating mechanism 28 is started again to heat the circulating air, thereby realizing hot air circulation in the calcination zone 303.

[0082] Specifically, the tunnel furnace body 30 includes at least two calcining zones 303, which are connected in sequence to achieve multiple calcinations of the SCR catalyst module 25 and ensure that the moisture in the SCR catalyst module 25 is completely evaporated. In the direction of movement of the carrier 26, the heating temperature of at least two calcining zones 303 increases sequentially to completely evaporate the moisture in the SCR catalyst module 25. Each calcining zone 303 is provided with an independent calcining heating mechanism 28 and a calcining air circulation mechanism to achieve separate control of the temperature and wind speed of each calcining zone 303, so as to accurately regulate the temperature and wind speed of each calcining zone 303 and reduce energy waste. In this embodiment, the number of calcining zones 303 is three, and the three calcining zones 303 are arranged in sequence along the direction of movement of the carrier 26, and the heating temperature of the three calcining zones 303 increases sequentially. In addition, the flow direction of the circulating air in the three calcining zones 303 is the same, and is the same as the flow direction of the circulating air in the second regeneration zone 302. In other embodiments, the number of calcining zones 303 may be two, four, five, six, seven, eight, nine, or more.

[0083] The calcination heating mechanism 28 can be a resistance wire heater or a gas heater. The calcination air circulation mechanism includes a calcination circulation fan 14 and a calcination circulation air duct. The calcination circulation fan 14 is located on the side wall of the calcination zone 303. The calcination circulation air duct is connected to the calcination zone 303. The calcination circulation fan 14 is located on the calcination circulation air duct and circulates the air in the calcination zone 303 through the calcination circulation air duct and the calcination zone 303. Specifically, the calcination circulating air duct includes a calcination air inlet pipe 141 and a calcination exhaust pipe 142. The calcination air inlet pipe 141 is connected to the calcination exhaust pipe 142, and the calcination air inlet pipe 141 is connected to the air inlet of the calcination zone 303, and the calcination exhaust pipe 142 is connected to the exhaust port of the calcination zone 303. The calcination circulating fan 14 is arranged on the calcination air inlet pipe 141. The calcination circulating fan 14 allows the wind from the calcination air inlet pipe 141 to enter the calcination zone 303 through the air inlet, and the calcination circulating fan 14 allows the wind from the calcination exhaust pipe 142 to enter the calcination air inlet pipe 141, so that the wind in the calcination zone 303 flows to the calcination exhaust pipe 142, so that the air in the calcination zone 303 forms a circulation between the calcination zone 303, the calcination exhaust pipe and the calcination air inlet pipe.

[0084] The calcining air circulation mechanism also includes a fairing 41. A fairing 41 is provided at both the outlet and return air ends of the calcining circulation air duct. The calcining air inlet pipe 141 is connected to the air inlet of the calcining zone 303 through one fairing 41, and the combustion exhaust pipe is connected to the exhaust of the calcining zone 303 through another fairing 41. A rectifier 42 is also provided at one end of the exhaust. The rectifier 42 is arranged near the fairing 41 at one end of the exhaust. Air flows in the calcining zone 303, passing through the rectifier 42 and the fairing 41 at the exhaust end in sequence. Specifically, the fairing 41 and the rectifier 42 are provided on the sidewalls of the calcining zone 303.

[0085] Furthermore, a calcination air inlet valve 3 is provided on the calcination air inlet pipe 141, and a calcination air exhaust valve 4 is provided on the calcination air exhaust pipe 142. By controlling the opening of the calcination air inlet valve 3 and the calcination air exhaust valve 4, the air volume entering the calcination zone 303 through the calcination air inlet pipe 141 can be precisely controlled, thereby controlling the temperature and humidity within the calcination zone 303. Specifically, a calcination temperature sensor 20 is provided in the calcination zone 303, and the opening of the calcination air inlet valve 3 and the calcination air exhaust valve 4 are precisely controlled based on the temperature obtained by the calcination temperature sensor 20.

[0086] In some embodiments of the present disclosure, the calcination exhaust pipe 142 of the calcination air circulation mechanism is connected to the drying air intake pipe 131 of the drying air circulation mechanism to introduce the hot air in the calcination zone 303 into the drying zone 301, thereby improving the utilization rate of the waste heat in the calcination zone 303. Specifically, in the moving direction of the carrier vehicle 26, the calcination exhaust pipes 142 of the two drying circulation fans 13 located in the front of the three drying air circulation mechanisms arranged in sequence are connected to the drying air intake pipe 131 of the drying air circulation mechanism to introduce hot air with more heat into the drying air circulation mechanism. The two calcination exhaust pipes 142 are respectively provided with a waste heat circulation branch valve 5, and the pipeline connecting the calcination exhaust pipe 142 and the drying air intake pipe 131 is also provided with a waste heat circulation main valve 6.

[0087] In some embodiments of the present disclosure, a plurality of liftable windshields 31 are provided in the tunnel furnace body 30, and the windshields 31 divide the tunnel furnace body 30 into a drying zone 301, a regeneration zone 302, and a calcining zone 303. Specifically, a windshield 31 is provided at opposite ends of each working zone to ensure that each working zone can form a separate closed area. It should be noted that when the carrier 26 moves in the working zone, the air inlet and air outlet of the working zone are located on both sides of the carrier 26, and the two windshields 31 are located at both ends of the working zone along the moving direction of the carrier 26. The working zone includes a drying zone 301, a regeneration zone 302, and a calcining zone 303.

[0088] In some embodiments of the present disclosure, the integrated drying, activation, and calcination equipment for regenerating an SCR denitration catalyst further includes a control system. The control system includes: a control processor, a temperature measuring instrument, an air velocity measuring instrument, a temperature controller, etc., wherein each working area is provided with a temperature measuring instrument, an air velocity measuring instrument, and a temperature controller, respectively. The control processor is electrically connected to each temperature measuring instrument, each air velocity measuring instrument, and each temperature controller, and is also electrically connected to the air circulation mechanism and heating mechanism of each working area. The control processor controls the wind speed and air volume of the wind circulation mechanism and the heating temperature of the heating mechanism based on the temperature and wind speed of each working area. The control processor is electrically connected to the activation liquid spraying mechanism of the regeneration area 302. Specifically, the control processor is electrically connected to the weighing device 23 and the activation liquid supply pump 16. The controller controls whether the activation liquid supply pump 16 continues to pump the activation liquid into the spray head based on the number of weighing devices 23. The control processor is also electrically connected to the intake and exhaust valves of each of the aforementioned workspaces, as well as to the waste heat circulation main valve 6, waste heat circulation branch valve 5, check valve 12, and bypass valve 11. Based on data from the temperature and wind speed meters, the control processor controls the opening of the intake and exhaust valves in each workspace to control the temperature and wind speed in each workspace. Furthermore, the heating temperature of the heating mechanism in each workspace can be controlled via a temperature controller. The temperature controller can communicate with a touch screen and upload data to a host computer.

[0089] The circulating fans in each working area in this embodiment are the same type of fans, which include a motor, a support, fan blades, bearings and a shaft. The support supports the fan shaft and blades. The support is installed at the center line position of the furnace top of each working area. The circulating fan blades adopt a centrifugal structure.

[0090] The carrier vehicle 26 in this embodiment includes a frame, a trolley surface, a frame plate, wheels, refractory masonry, etc. The load-bearing trolley surface is flat, and a shim is provided on the trolley surface. The steel structure frame of the carrier vehicle 26 is welded with a single layer of steel beams and steel plates. Its rigidity ensures normal operation under full load and no deformation during long-term use. The maximum load-bearing capacity of the steel structure design of each carrier vehicle 26 is 4 tons, ensuring that the deformation is still within the design range when the load is uneven. The running wheels of the carrier vehicle 26 are processed and formed from castings. The drive shaft is made of 45# steel with precision processing and tempering treatment. The transmission bearing adopts roller bearings to ensure the load requirements. The lining is built with lightweight thermal insulation materials to reduce heat storage.

[0091] like Figure 1 As shown, the second aspect of the present disclosure proposes an integrated drying, activation and calcination method for regenerating an SCR denitration catalyst, the method comprising:

[0092] S100: Cleaning the SCR catalyst module;

[0093] S200: Drying and air-heating the cleaned SCR catalyst module;

[0094] S300: Perform activation liquid atomization spraying treatment on the dried SCR catalyst module;

[0095] S400: The SCR catalyst module after being sprayed with the activation liquid is subjected to calcination and wind heat treatment.

[0096] The integrated drying, activation and calcination method for regenerating the SCR denitration catalyst of the disclosed embodiment first cleans the SCR catalyst model to remove dust on the surface and in the pores of the SCR catalyst module. At the same time, the condensed sulfate and ammonium salt in the SCR catalyst module can be dissolved in water, thereby reducing the salt content in the SCR catalyst module; then, the SCR catalyst module after the cleaning treatment is subjected to a dry air heat treatment, and the circulating hot air forms a convection heat transfer with the dried SCR catalyst module. The circulating hot air evaporates the moisture in the SCR catalyst module, thereby removing the moisture in the SCR catalyst module and ensuring that the SCR catalyst module can absorb sufficient activation liquid; and then the activation liquid is atomized on the dried SCR catalyst module Spray treatment, atomized spraying can make the activation liquid spray more evenly on the surface and pores of the SCR catalyst module, ensuring that the SCR catalyst module can absorb sufficient activator; finally, the SCR catalyst module is subjected to high-temperature calcination wind heat treatment, and the circulating hot air and the SCR catalyst module after spraying the activator undergo convection heat transfer. The water in the activation liquid on the surface and in the pores of the SCR catalyst module is evaporated by heat, and the active substance intermediates remain on the surface and in the pores of the SCR catalyst module. As the circulating hot air and the SCR catalyst module undergo continuous convection heat transfer, the activation substance intermediates begin to decompose, and eventually the target active substances are formed on the surface and in the pores of the SCR catalyst module to restore the catalyst activity and make the SCR catalyst module catalytically active.

[0097] In the integrated drying, activation and calcination method for regenerating an SCR denitration catalyst according to the disclosed embodiment, the SCR catalyst module does not need to be cooled after being dried and thermally treated, and an activator can be directly sprayed through a spray mechanism, thereby saving the cooling time of the SCR catalyst module after drying and improving the regeneration efficiency of the SCR catalyst module. At the same time, the cooling steps of the SCR catalyst module in the drying area are reduced, which can reduce the energy consumption in the entire process of SCR catalyst regeneration.

[0098] S100: Cleaning the SCR catalyst module.

[0099] Specifically, the SCR catalyst module is subjected to physical cleaning, chemical cleaning, ultrasonic cleaning, bubbling rinsing and other operations to remove dust on the surface and inside the pores of the SCR catalyst module, improve the cleanliness of the surface and inside the pores of the SCR catalyst module, and at the same time dissolve the condensed sulfate and ammonium salt in the SCR catalyst module in water to reduce the salt content in the SCR catalyst module.

[0100] S200: Drying and air-heating the cleaned SCR catalyst module, specifically including:

[0101] S210: performing a first hot air heating on the cleaned SCR catalyst module;

[0102] S220: performing a second hot air heating on the SCR catalyst module after the first hot air heating;

[0103] S230: performing a third hot air heating on the SCR catalyst module after the second hot air heating;

[0104] The temperature of the first hot air heating is less than or equal to the temperature of the second hot air heating, and the temperature of the second hot air heating is less than or equal to the temperature of the third hot air heating.

[0105] First, the cleaned SCR catalyst module is heated with hot air for the first time in the first drying zone, that is, the air in the drying zone is formed into circulating air by a drying circulation mechanism in the first drying zone, and the air in the first drying zone is heated by a drying heating mechanism. Under the action of the drying circulation mechanism, the hot air in the first drying zone forms circulating hot air, and the circulating hot air forms convection heat transfer with the SCR catalyst module, thereby evaporating most of the moisture in the SCR catalyst module.

[0106] Then, the SCR catalyst module after the first heating is heated for the second time in the second drying zone, that is, the air in the drying zone is formed into circulating air by the drying circulation mechanism in the second drying zone, and the air in the second drying zone is heated by the drying heating mechanism. Under the action of the drying circulation mechanism, the hot air in the second drying zone forms circulating hot air, and the circulating hot air forms convection heat transfer with the SCR catalyst module, thereby evaporating a small part of the moisture in the SCR catalyst module.

[0107] Finally, the SCR catalyst module after secondary heating is heated for the second time in the third drying zone, that is, the air in the drying zone is formed into circulating air through the drying circulation mechanism in the third drying zone, and the air in the third drying zone is heated by the drying heating mechanism. Under the action of the drying circulation mechanism, the hot air in the third drying zone forms circulating hot air, and the circulating hot air forms convection heat transfer with the SCR catalyst module, thereby evaporating the remaining water in the SCR catalyst module.

[0108] In this embodiment, the temperature of the first hot air heating is less than or equal to the temperature of the second hot air heating, and the temperature of the second hot air heating is less than or equal to the temperature of the third hot air heating. The temperature of the hot air heating continues to rise so that the moisture in the SCR catalyst module is completely evaporated, thereby ensuring the dryness of the SCR catalyst module after the three hot air heatings.

[0109] Specifically, the temperature range of the first hot air heating is 120℃~160℃, and the circulating air volume range of the first hot air heating is 20m 3 / min~30m3 / min; the temperature range of the second hot air heating is 160 ℃ ~ 180 ℃, the second hot air heating circulation air volume range is 15m 3 / min~22m 3 / min; the temperature range of the third hot air heating is 200 ℃ ~ 220 ℃, the circulating air volume range of the third hot air heating is 10m 3 / min~15m 3 / min.

[0110] S300: The dried SCR catalyst module is subjected to an activation liquid atomization spray treatment, specifically including:

[0111] S310: performing the first activation liquid atomization spraying treatment on the dried SCR catalyst module;

[0112] S320: performing a second activation liquid atomization spraying treatment on the SCR catalyst module after the first activation liquid atomization spraying treatment;

[0113] Wherein, the spraying direction of the first activation liquid atomization spraying treatment is opposite to the spraying direction of the second activation liquid atomization spraying treatment.

[0114] The dried SCR catalyst module is loaded into the first regeneration zone by a carrier vehicle. The activation liquid spraying mechanism of the first regeneration zone sprays the SCR catalyst. At the same time, the regeneration air circulation mechanism of the first regeneration zone circulates the air in the first regeneration zone so that the activation liquid sprayed by the activation liquid spraying mechanism flows or moves along the extension direction of the pores of the SCR catalyst, so that the activation liquid is more evenly distributed on the surface and pores of the SCR catalyst. The activation liquid spraying mechanism of the first regeneration zone sprays a certain amount of activation liquid.

[0115] After spraying a certain amount of activation liquid, the SCR catalyst module is loaded into the second regeneration zone by a carrier vehicle. The activation liquid spraying mechanism in the second regeneration zone sprays the SCR catalyst. At the same time, the regeneration air circulation mechanism in the second regeneration zone circulates the air in the second regeneration zone so that the activation liquid sprayed by the activation liquid spraying mechanism flows or moves along the extension direction of the pores of the SCR catalyst, so that the activation liquid is more evenly distributed on the surface and pores of the SCR catalyst. The activation liquid spraying mechanism in the second regeneration zone sprays a certain amount of activation liquid.

[0116] After the SCR catalyst module is sprayed with the first activation liquid in the first regeneration zone and the second activation liquid in the second regeneration zone, a sufficient amount of activation liquid is attached to the surface and pores of the SCR catalyst module.

[0117] Furthermore, the activation liquid spraying mechanism in the first regeneration zone sprays in an opposite direction to the activation liquid spraying mechanism in the second regeneration zone, and the circulating air in the first regeneration zone flows in an opposite direction to the circulating air in the second regeneration zone. The activation liquid spray head in the first regeneration zone sprays the activation liquid from the first end of the hole in the SCR catalyst module, and the activation liquid spray head in the second regeneration zone sprays the activation liquid from the second end of the hole in the SCR catalyst module. The first end and the second end are the opposite ends of the hole in the SCR catalyst module, respectively. That is, the spray liquid in the first regeneration zone enters the hole from the first end of the hole in the SCR catalyst module and flows or moves along the direction of the hole toward the second end of the hole. The spray liquid in the second regeneration zone enters the hole from the second end of the hole in the SCR catalyst module and flows or moves along the direction of the hole toward the first end of the hole, so that the spray liquid can completely cover the surface of the hole, allowing the catalyst to adhere more fully to the surface of the hole.

[0118] In some embodiments of the present disclosure, the circulating wind direction of the drying wind heat treatment is the same as the spray direction of the first activation liquid atomization spray treatment, and the circulating wind direction of the calcining wind heat treatment is the same as the spray direction of the second activation liquid atomization spray treatment.

[0119] S400: Calcination and wind heat treatment of the SCR catalyst module after spraying the activation liquid, specifically including:

[0120] S410: performing the first calcination and air heating on the SCR catalyst module after spraying the activation liquid;

[0121] S420: performing a second calcination and wind heating on the SCR catalyst module after the first calcination and wind heating;

[0122] S430: performing a third calcination and wind heating on the SCR catalyst module after the second calcination and wind heating;

[0123] The temperature of the first calcination by wind heat is less than or equal to the temperature of the second calcination by wind heat, and the temperature of the second calcination by wind heat is less than or equal to the temperature of the third calcination by wind heat.

[0124] First, the sprayed SCR catalyst module is heated with hot air for the first time in the first calcination zone, that is, the air in the calcination zone is formed into circulating air by a calcination circulation mechanism in the first calcination zone, and the air in the first calcination zone is heated by the calcination heating mechanism. Under the action of the calcination circulation mechanism, the hot air in the first calcination zone forms circulating hot air, and the circulating hot air forms convection heat transfer with the SCR catalyst module, thereby evaporating most of the moisture in the SCR catalyst module.

[0125] Then, in the second calcination zone, the SCR catalyst module that has been heated by hot air once is subjected to a second hot air heating. That is, in the second calcination zone, the air in the calcination zone is formed into circulating air by a calcination circulation mechanism, and the air in the second calcination zone is heated by the calcination heating mechanism. Under the action of the calcination circulation mechanism, the hot air in the second calcination zone forms circulating hot air, and the circulating hot air forms convection heat transfer with the SCR catalyst module, thereby evaporating a small amount of water in the SCR catalyst module.

[0126] Finally, in the third calcination zone, the SCR catalyst module after the secondary hot air heating is subjected to a second hot air heating, that is, the air in the calcination zone is formed into circulating air by the calcination circulation mechanism in the third calcination zone, and the air in the third calcination zone is heated by the calcination heating mechanism. Under the action of the calcination circulation mechanism, the hot air in the third calcination zone forms circulating hot air, and the circulating hot air forms convection heat transfer with the SCR catalyst module, thereby evaporating the remaining water in the SCR catalyst module.

[0127] In this embodiment, the temperature of the first calcination wind heating is less than or equal to the temperature of the second calcination wind heating, and the temperature of the second calcination wind heating is less than or equal to the temperature of the third calcination wind heating. The temperature of the calcination wind heating continues to rise so that the moisture in the SCR catalyst module is completely evaporated, ensuring the calcination degree of the SCR catalyst module after the three calcination wind heatings.

[0128] Specifically, the temperature range of the first hot air heating is 160℃~180℃, and the circulating air volume range of the first hot air heating is 12m 3 / min~18m 3 / min; the temperature range of the second hot air heating is 260 ℃ ~ 280 ℃, the second hot air heating circulation air volume range is 10m 3 / min~15m 3 / min; the temperature range of the third hot air heating is 320 ℃ ~ 360 ℃, the circulating air volume range of the third hot air heating is 8m 3 / min~12m 3 / min.

[0129] In some embodiments of the present disclosure, the circulating hot air from a portion of the calcination wind thermal treatment is used for the dry wind thermal treatment.

[0130] Specifically, the calcining exhaust pipe of the calcining air circulation mechanism is connected to the drying air intake pipe of the drying air circulation mechanism to introduce hot air from the calcining area into the drying area, thereby improving the utilization rate of the waste heat in the calcining area. Specifically, in the direction of movement of the carrier vehicle, the calcining exhaust pipes of the two drying air circulation mechanisms located in the front are connected to the drying air intake pipe of the drying air circulation mechanism to introduce hot air with higher heat into the drying air circulation mechanism.

[0131] Example 1

[0132] The SCR catalyst module is a honeycomb catalyst module. The length, width and height of the honeycomb catalyst module are 1910×960×1050mm respectively, the unit body of the honeycomb catalyst module is 150×150×920mm, and the total mass of the honeycomb catalyst module is 983Kg.

[0133] The tunnel furnace body includes a drying zone, a regeneration zone and a calcining zone which are connected in sequence.

[0134] S100: Cleaning the SCR catalyst module;

[0135] Perform physical cleaning, chemical cleaning, ultrasonic cleaning, bubbling rinsing and other operations on the SCR catalyst module.

[0136] S200: Drying and air-heating the cleaned SCR catalyst module;

[0137] In the first drying area, the cleaned SCR catalyst module is heated by hot air for the first time. The heating temperature is 160℃ and the circulating air volume is 30m 3 / min; in the second drying area, the SCR catalyst module is heated by hot air for the second time, with a heating temperature of 180℃ and a circulating air volume of 22m 3 / min; in the third drying zone, the SCR catalyst module is heated by hot air for the third time, with a heating temperature of 220℃ and a circulating air volume of 15m 3 / min.

[0138] S300: Perform activation liquid atomization spraying treatment on the dried SCR catalyst module;

[0139] In the first regeneration zone, the SCR catalyst module after three hot air heating is subjected to the first activation liquid atomization spray treatment, the spraying rate of the activation liquid is 400ml / min, and the activation liquid injection volume is 20L; in the second regeneration zone, the SCR catalyst module after the first spraying is subjected to the second activation liquid atomization spray treatment in the reverse direction, the spraying rate of the activation liquid is 400ml / min, and the activation liquid injection volume is 20L.

[0140] S400: The SCR catalyst module after being sprayed with the activation liquid is subjected to calcination and wind heat treatment.

[0141] In the first calcination zone, the SCR catalyst module after the second spraying of the activation liquid is subjected to the first calcination with wind heating. The heating temperature is 180℃ and the circulating air volume is 18m 3 / min; in the second calcination zone, the SCR catalyst module after the first calcination is subjected to a second calcination with a heating temperature of 280°C and a circulating air volume of 15m 3 / min; in the third calcination zone, the SCR catalyst module after the second calcination is subjected to a third calcination with a heating temperature of 360°C and a circulating air volume of 12m 3 / min.

[0142] Comparative Example 1

[0143] The difference between Comparative Example 1 and Example 1 is:

[0144] The drying zone, regeneration zone and calcination zone are set up separately and are not connected to each other.

[0145] S200: Move the SCR catalyst to a separate drying tunnel furnace, perform a drying and air-heating treatment on the cleaned SCR catalyst module, and then perform a cooling treatment on the SCR catalyst module;

[0146] S400: Move the SCR catalyst module to a separate calcination tunnel furnace and perform calcination and wind heat treatment on the SCR catalyst module after spraying the activation liquid.

[0147] Example 2

[0148] The SCR catalyst module is a plate-type catalyst module. The length, width and height of the plate-type catalyst module are 1915*970*1400mm respectively. The size of the single-piece plate-type catalyst module is 460*600mm. The total mass of the plate-type catalyst module is 710Kg.

[0149] The tunnel furnace body includes a drying zone, a regeneration zone and a calcining zone which are connected in sequence.

[0150] S100: Cleaning the SCR catalyst module;

[0151] Perform physical cleaning, chemical cleaning, ultrasonic cleaning, bubbling rinsing and other operations on the SCR catalyst module.

[0152] S200: Drying and air-heating the cleaned SCR catalyst module;

[0153] In the first drying area, the cleaned SCR catalyst module is heated with hot air for the first time. The heating temperature is 120℃ and the circulating air volume is 20m 3 / min; in the second drying area, the SCR catalyst module is heated by hot air for the second time, with a heating temperature of 160°C and a circulating air volume of 15m 3 / min; in the third drying zone, the SCR catalyst module is heated by hot air for the third time, the heating temperature is 200℃, and the circulating air volume is 10m 3 / min.

[0154] S300: Perform activation liquid atomization spraying treatment on the dried SCR catalyst module;

[0155] In the first regeneration zone, the SCR catalyst module after three hot air heating is subjected to the first activation liquid atomization spray treatment, the spraying rate of the activation liquid is 300ml / min, and the activation liquid injection volume is 15L; in the second regeneration zone, the SCR catalyst module after the first spraying is subjected to the second activation liquid atomization spray treatment in the reverse direction, the spraying rate of the activation liquid is 300ml / min, and the activation liquid injection volume is 15L.

[0156] S400: The SCR catalyst module after being sprayed with the activation liquid is subjected to calcination and wind heat treatment.

[0157] In the first calcination zone, the SCR catalyst module after the second spraying of the activation liquid is subjected to the first calcination with wind heating. The heating temperature is 160℃ and the circulating air volume is 12m 3 / min; in the second calcination zone, the SCR catalyst module after the first calcination is subjected to a second calcination with a heating temperature of 260°C and a circulating air volume of 10m 3 / min; in the third calcination zone, the SCR catalyst module after the second calcination is subjected to a third calcination with wind heating, the heating temperature is 320℃, and the circulating air volume is 8m 3 / min.

[0158] Comparative Example 2

[0159] The difference between Comparative Example 2 and Example 2 is:

[0160] The drying zone, regeneration zone and calcination zone are set up separately and are not connected to each other.

[0161] S200: Move the SCR catalyst to a separate drying tunnel furnace, perform a drying and air-heating treatment on the cleaned SCR catalyst module, and then perform a cooling treatment on the SCR catalyst module;

[0162] S400: Move the SCR catalyst module to a separate calcination tunnel furnace and perform calcination and wind heat treatment on the SCR catalyst module after spraying the activation liquid.

[0163] Table 1 Consumption schedule of each process in the embodiment and comparative example

[0164]

[0165] It can be seen from Table 1 that the drying process of Example 1 takes less time than the drying process of Comparative Example 1, and the drying process of Example 2 takes less time than the drying process of Comparative Example 2. The main reason is that the drying processes in Example 1 and Example 2 do not need to wait for the SCR catalyst module to cool down, and can directly enter the regeneration zone for activation and regeneration, while the SCR catalyst modules in Comparative Examples 1 and 2 need to cool down before entering a separate regeneration tunnel furnace; the high-temperature calcination process of Example 1 takes less time than the high-temperature calcination process of Comparative Example 1, and the high-temperature calcination process of Example 2 takes less time than the high-temperature calcination process of Comparative Example 2. The main reason is that after activation and regeneration, the SCR catalyst modules in Example 1 and Example 2 directly enter the calcination zone for high-temperature calcination, while after activation and regeneration, the SCR catalyst modules in Comparative Examples 1 and 2 need to be transferred to a separate calcination tunnel furnace. During the transfer of the SCR catalyst module, the temperature of the SCR catalyst module decreases. Therefore, the SCR catalyst modules in Comparative Examples 1 and 2 spend a longer time in the calcination tunnel furnace.

[0166] Table 2 Natural gas consumption of examples and comparative examples

[0167]

[0168] As can be seen from Table 2, the amount of natural gas consumed by each SCR catalyst module in Example 1 is less than the amount of natural gas consumed by each SCR catalyst module in Comparative Example 1, and the energy consumption of each SCR catalyst module is reduced by 43.9%; the amount of natural gas consumed by each SCR catalyst module in Example 2 is less than the amount of natural gas consumed by each SCR catalyst module in Comparative Example 2, and the energy consumption of each SCR catalyst module is reduced by 33.9%.

[0169] Table 3 Analysis of elements of Example 1 and Comparative Example 1

[0170]

[0171] Elemental analysis of the finished catalyst modules of Example 1 and Comparative Example 1 was performed using X-ray fluorescence spectroscopy (XRF). Table 3 shows that, given the same mass of active material implanted in each catalyst module, the surface V₂O₅ content of Example 1 was 0.37% higher than that of the comparative substrate, while the surface V₂O₅ content of the comparative substrate was 0.06% higher. This is because the active material sprayed using the atomized spray method is primarily adsorbed on the catalyst surface, facilitating surface enrichment and making it easier to achieve a higher active material content on the catalyst surface than on the substrate.

[0172] It is understood that the above embodiments are merely exemplary embodiments for illustrating the principles of the present disclosure, and the present disclosure is not limited thereto. Those skilled in the art may make various modifications and improvements without departing from the spirit and substance of the present disclosure, and such modifications and improvements are also considered to be within the scope of protection of the present disclosure.

Claims

1. A drying, activation and calcination integrated method for regeneration of SCR denitration catalyst, characterized in that: The method comprises: Clean the SCR catalyst module; Perform dry air heat treatment on the cleaned SCR catalyst module; The dried SCR catalyst module is treated with an activation liquid atomization spray; The SCR catalyst module after being sprayed with the activation liquid is subjected to calcination and wind heat treatment.

2. The drying, activation and calcination integrated method for regeneration of an SCR denitration catalyst according to claim 1, characterized in that: The atomization spraying treatment of the dried SCR catalyst module with the activation liquid specifically includes: The dried SCR catalyst module is subjected to the first activation liquid atomization spray treatment; Performing a second activation liquid atomization spray treatment on the SCR catalyst module after the first activation liquid atomization spray treatment; Wherein, the spraying direction of the first activation liquid atomization spraying treatment is opposite to the spraying direction of the second activation liquid atomization spraying treatment.

3. The drying, activation and calcination integrated method for regeneration of an SCR denitration catalyst according to claim 2, characterized in that: The spraying direction of the first activation liquid atomization spraying treatment and the spraying direction of the second activation liquid atomization spraying treatment are both along the extending direction of the holes of the SCR catalyst module.

4. The drying, activation and calcination integrated method for regeneration of an SCR denitration catalyst according to claim 2, characterized in that: The circulating wind direction of the drying wind heat treatment is the same as the spray direction of the first activation liquid atomization spray treatment, and the circulating wind direction of the calcining wind heat treatment is the same as the spray direction of the second activation liquid atomization spray treatment.

5. The method for regenerating an SCR catalyst module according to claim 1, characterized in that: The drying and wind-heating treatment of the cleaned SCR catalyst module specifically includes: Perform the first hot air heating on the cleaned SCR catalyst module; Performing a second hot air heating on the SCR catalyst module after the first hot air heating; The SCR catalyst module after the second hot air heating is subjected to a third hot air heating; The temperature of the first hot air heating is less than or equal to the temperature of the second hot air heating, and the temperature of the second hot air heating is less than or equal to the temperature of the third hot air heating.

6. The drying, activation and calcination integrated method for regeneration of an SCR denitration catalyst according to claim 5, characterized in that: The temperature range of the first hot air heating is 120℃~160℃, and the circulating air volume range of the first hot air heating is 20m 3 / min~30m 3 / min; The temperature range of the second hot air heating is 160℃~180℃, and the circulating air volume range of the second hot air heating is 15m 3 / min~22m 3 / min; The temperature range of the third hot air heating is 200℃~220℃, and the circulating air volume range of the third hot air heating is 10m 3 / min~15m 3 / min.

7. The drying, activation and calcination integrated method for regeneration of an SCR denitration catalyst according to claim 1, characterized in that: The calcining and wind-heating treatment of the SCR catalyst module after spraying the activation liquid specifically includes: The SCR catalyst module after spraying the activation liquid is subjected to the first calcination by air heating; The SCR catalyst module after the first calcination and wind heating is subjected to a second calcination and wind heating; The SCR catalyst module after the second calcination and wind heating is subjected to a third calcination and wind heating; The temperature of the first calcination by wind heat is less than or equal to the temperature of the second calcination by wind heat, and the temperature of the second calcination by wind heat is less than or equal to the temperature of the third calcination by wind heat.

8. The drying, activation and calcination integrated method for regeneration of an SCR denitration catalyst according to claim 7, characterized in that: The temperature range of the first hot air heating is 160℃~180℃, and the circulating air volume range of the first hot air heating is 12m 3 / min~18m 3 / min; The temperature range of the second hot air heating is 260℃~280℃, and the circulating air volume range of the second hot air heating is 10m 3 / min~15m 3 / min; The temperature range of the third hot air heating is 320℃~360℃, and the circulating air volume range of the third hot air heating is 8m 3 / min~12m 3 / min.

9. The drying, activation and calcination integrated method for regeneration of an SCR denitration catalyst according to claim 1, characterized in that: Part of the circulating hot air from the calcination wind heat treatment is used for the drying wind heat treatment.

10. An integrated drying, activation and calcination device for regenerating an SCR denitration catalyst, used for implementing the integrated drying, activation and calcination method for regenerating an SCR denitration catalyst according to any one of claims 1 to 9, characterized in that: The drying, activation and calcination integrated equipment for regenerating the SCR denitration catalyst includes a tunnel furnace body and a carrier vehicle cooperating with the tunnel furnace body. Along the moving direction of the carrier vehicle, the tunnel furnace body includes a drying zone, a regeneration zone and a calcination zone in sequence; The drying area is provided with a drying heating mechanism and a drying air circulation mechanism; The regeneration zone is provided with an activation spray mechanism and a regeneration air circulation mechanism; The calcination zone is provided with a calcination heating mechanism and a calcination air circulation mechanism, and the exhaust port of the calcination air circulation mechanism is communicated with the air inlet of the drying air circulation mechanism.

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