Air pre-heater wall temperature dynamic adjustment and air energy soot blowing combined soot cleaning system and method

Abstract

The invention provides an air pre-heater wall temperature dynamic adjustment and air energy soot blowing combined soot cleaning system and method.The system comprises a temperature control device, a soot blowing device and a track, the track is used for supporting the temperature control device to move in the air pre-heater in the radial direction of a heat storage element, and the temperature control device comprises a wind blocking base extending towards the two sides of the track in the length direction; the wind shielding base is provided with wind shielding pieces capable of being unfolded and folded, and when the wind shielding pieces of the multiple temperature control devices are unfolded at the same circumferential position, the wind shielding pieces are jointly used for increasing the wall temperature of the heat storage element, so that a high-temperature ring area is formed on the heat storage element. The soot blowing device is used for blowing soot on the high-temperature ring area on the smoke side of the air pre-heater. The temperature control device can move in the radial direction of the heat storage element of the air pre-heater, a high-temperature ring area capable of dynamically changing is formed on the heat storage element, in cooperation with the soot blowing device, the soot cleaning dead angle in the soot cleaning operation can be greatly reduced, and the good soot cleaning effect is achieved.

Description

Technical Field

[0001] The present invention relates to an air preheater dust cleaning system and method, and in particular to an air preheater wall temperature dynamic regulation and air energy soot blowing combined dust cleaning system and method. Background Art

[0002] In the power industry, fuel costs are the most direct factor impacting the profitability of power producers and a top priority for cost control. To reduce costs and increase efficiency, thermal power plants generally use low-calorific-value, low-cost coal blending as a means of increasing marginal profits. This reduction in the average calorific value of the incoming coal results in higher ash content, and higher dust and sulfur (SO3) content in the flue gas. At the same time, with the improvement of environmental protection requirements, the denitrification equipment of power station boilers in thermal power plants needs to be modified. The ammonia escaping from the boiler denitrification system reacts with SO3, water vapor and other substances in the flue gas to form ammonium bisulfate. Ammonium bisulfate is generally a liquid substance in the range of 146 to 207°C. Liquid ammonium bisulfate is a very viscous substance. When the flue gas passes through the heat storage element (or heat exchange element) of the rotary air preheater (hereinafter referred to as the air preheater), the heat storage element on the flue gas side and the air side is generally hot at the top and cold at the bottom (hot flue gas from top to bottom, cold air from bottom to top). 146 to 207°C is in the heat storage element. Liquid ammonium bisulfate is easy to adhere to the fly ash in the boiler flue gas to form a sticky and easily blocked substance. The easily blocked substance will adhere to the heat storage element, gradually accumulate and harden, forming stubborn ash deposits that cause blockage of the rotary air preheater.

[0003] At present, the above problem is usually solved by increasing the wall temperature of the heat storage element. In one type of solution to increase the wall temperature of the heat storage element, such as the "Rotary Heat Exchanger Anti-Blocking System and Anti-Blocking Method Based on Ring-Shaped Cyclic Heating" disclosed in Chinese invention patent CN202111005676.6, the cold end face of the heat exchanger rotor is divided into N concentric rings by a circumferential partition, N ≥ 2, and N special-shaped cold medium pipes are set at the cold end of at least one cold medium compartment. One end of the special-shaped cold medium pipe is a fan-shaped opening and the other end is a rectangular opening. Each fan-shaped opening They are arranged in one-to-one correspondence with the concentric rings, and the radial edges on both sides of the fan-shaped openings are connected to the side edges of the cold-end fan-shaped plates in the corresponding concentric rings, and the plane where the fan-shaped openings are located is flush with the sealing surface of the cold-end fan-shaped plates; each rectangular opening is provided with an automatic regulating door that can adjust the flow of the cold medium, which reduces the flow of the cold medium in the various special-shaped cold medium pipes by cycle, increases the wall temperature of the heat storage element in the corresponding concentric ring, and gradually vaporizes the condensed or crystallized materials adhering to them, and is discharged from the heat exchanger rotor along with the hot medium, thereby effectively solving the blockage and corrosion problems of the rotary heat exchanger.

[0004] In short, the above-mentioned disclosed patent solution is to divide the heat storage element into several concentric rings, and install a special-shaped cold medium pipe and an automatic adjustment door at the cold end of the air side of the air preheater to block the cold air from entering one of the concentric rings, thereby heating the heat storage element in this concentric ring. Based on the above-mentioned disclosed patent solution, there are also some solutions for assisting in increasing the wall temperature of the heat storage element, such as the "A Rotary Air Preheater Split-Ring Heating and Blockage Treatment Method and System" disclosed in the Chinese invention patent CN202410336345.8 that forms a hot air curtain at the cold end of the air side of the air preheater, and the "A Rotary Air Preheater Split-Ring Heating System Based on Warm Air Zone Management" that adds a steam heat source to the air side of the air preheater, etc., all of which are solutions for increasing the wall temperature of the heat storage element based on the concentric rings, special-shaped cold medium pipes and automatic adjustment door structures.

[0005] However, the above schemes also have some obvious disadvantages. As the basis for increasing the wall temperature of the heat storage element, whether it is concentric rings or special-shaped cold medium tubes, on the one hand, both require major modifications to the existing air preheater structure. The special-shaped cold medium tubes occupy too much air preheater space, and the existing air preheater is difficult to undergo such major modifications due to its structural characteristics, resulting in poor applicability. On the other hand, the special-shaped cold medium tubes and automatic regulating doors are both fixed structures. Their fixed characteristics make it impossible to dynamically and specifically increase the wall temperature of the heat storage element. This creates a blind spot for increasing the wall temperature. For example, the heating effect of the heat storage element at the concentric ring is affected by the bypass special-shaped cold medium tube, and is not as obvious as the wall temperature increase of the heat storage element between the two concentric rings. On the other hand, these similar schemes using concentric rings and special-shaped cold medium tubes do not have a targeted and dynamic soot blowing method. Although the wall temperature of the heat storage element can be increased, if there is no means similar to air-powered soot blowing, the soot cleaning and unblocking effects on the heat storage element are still limited.

[0006] In order to solve the above problems, people have been seeking an ideal technical solution. Summary of the Invention

[0007] The purpose of the present invention is to address the deficiencies of the existing technology and thus provide a system and method for dynamic regulation of the wall temperature of an air preheater and combined soot blowing with air. The temperature control device can move radially along the heat storage element of the air preheater to form a dynamically changeable high-temperature ring area on the heat storage element. In conjunction with the soot blowing device, it can greatly reduce the blind spots in the cleaning operation and achieve a good cleaning effect.

[0008] In order to achieve the above-mentioned purpose, the technical solution adopted by the present invention is: the combined cleaning system includes a temperature control device, a soot blowing device and a track, the track is used to support the temperature control device to move radially along the heat storage element in the air preheater, and multiple temperature control devices are respectively arranged on different tracks; the temperature control device is used to block a part of the cold air from blowing toward the heat storage element at the cold end of the air side of the air preheater, and the temperature control device includes a windshield base extending in the length direction to both sides of the track, and the windshield base is provided with a deployable and retractable windshield member, and when the windshield members of multiple temperature control devices are deployed at the same circumferential position of the heat storage element, they are jointly used to increase the wall temperature of the heat storage element to form a high-temperature ring area on the heat storage element; the soot blowing device is used to blow soot on the high-temperature ring area on the flue gas side of the air preheater.

[0009] Based on the above, the temperature control device includes a temperature control mobile frame, on which at least two groups of wind shield bases are provided, and multiple temperature control devices are provided with the same number of wind shield bases to form at least two high-temperature ring areas; the length of the wind shield base on the same temperature control device extending to both sides of the track increases according to the direction away from the rotating shaft of the heat storage element.

[0010] Based on the above, a temperature control spray assembly is provided on the windshield base, and the temperature control spray assembly includes a temperature control nozzle, which is used to spray heat medium into the high-temperature ring area of ​​the heat storage element to increase the wall temperature of the heat storage element.

[0011] Based on the above, the temperature control injection assembly includes a temperature control main pipe, the length direction of the temperature control main pipe extends to both sides of the track, and the temperature control nozzles are installed in rows along the length direction of the temperature control main pipe.

[0012] Based on the above, the windshield member adopts a windshield plate, which is unfolded from the windshield base toward the length direction of the track. Two windshield plates are rotatably provided on both sides of the windshield base. When the windshield plates are folded, they are closed above the windshield base; the side of the windshield plate away from the windshield base is set as an arc-shaped warped edge.

[0013] Based on the above, the temperature control device includes a telescopic rod, a connecting rod, a synchronous gear and a power connecting rod. The telescopic rod is telescopic along the length direction of the track. The two ends of the connecting rod are respectively hinged to the telescopic rod and one of the windshields. The two synchronous gears are respectively hinged to the ends of the two windshields. The two synchronous gears are meshed with each other, and the two power connecting rods are hinged to each other. The two power connecting rods are respectively hinged to the two windshields.

[0014] Based on the above, the soot blowing device is provided at the cold end of the flue gas side of the air preheater and / or the hot end of the flue gas side of the air preheater.

[0015] Based on the above, the sootblowing device includes a sootblowing movable frame and a sootblowing injection assembly. The sootblowing movable frame is arranged on another track, and the track is used to support the sootblowing movable frame to move radially along the heat storage element in the air preheater; multiple groups of sootblowing injection assemblies are arranged at intervals on the sootblowing movable frame to simultaneously blow soot on multiple high-temperature ring areas.

[0016] Based on the above, the sootblowing injection assembly includes a sootblowing mother pipe and a sootblowing nozzle. At least two sootblowing mother pipes are provided on the sootblowing movable frame. The length direction of the sootblowing mother pipe extends to both sides of the track. The sootblowing nozzles are installed in rows along the length direction of the sootblowing mother pipe. The pipe spacing of the sootblowing mother pipes is set according to the row spacing of the windshield base on the temperature control device, so that the sootblowing nozzles can blow soot to multiple high-temperature ring areas at the same time.

[0017] The present application also includes a combined cleaning method based on the dynamic regulation of the air preheater wall temperature and the air-energy soot blowing combined cleaning system, and the combined cleaning method includes: the wind shield members of the multiple temperature control devices are simultaneously maintained in an expanded state to form multiple wind shield areas, and the multiple temperature control devices move along the track so that the multiple wind shield areas are at the same circumferential position of the heat storage element, thereby forming the high-temperature ring area on the heat storage element, and then the soot blowing device is made to spray a jet toward the high-temperature ring area for soot blowing; multiple groups of the temperature control devices move along the track to form another high-temperature ring area on the heat storage element, and then the soot blowing device is made to spray a jet toward the high-temperature ring area for soot blowing; this cycle is repeated until the cleaning operation of the heat storage element is completed.

[0018] The present invention has substantial features and progress compared to the prior art. Specifically, the present invention adopts a combined cleaning system and method of a temperature control device, a soot blowing device and a track. Compared with the concentric ring and special-shaped cold medium pipe structures in the prior art, the present invention can form a dynamically changeable high-temperature ring area for the air preheater heat storage element in the form of a dynamic windbreak, so that the central ring of the high-temperature ring area can always maintain a higher wall temperature, reducing the dead angle for increasing the wall temperature of the heat storage element. At the same time, the ability of the temperature control device in the present application to dynamically increase the wall temperature of the heat storage element can also be adapted to most soot blowing devices in the prior art. The synergistic effect of the temperature control device and the soot blowing device can greatly reduce the dead angle for cleaning during the cleaning operation, achieving a good cleaning effect. Moreover, the relevant specific structure of the combined cleaning system of the present application is compact and efficient. It can be installed without major adjustments to the existing air preheater structure. It can be applied to most existing air preheaters that are already in operation, and has good applicability.

[0019] At the same time, multiple sets of windshield bases and windshields are provided on the temperature control device, which can form at least two high-temperature ring areas, thereby increasing the overall cleaning efficiency and avoiding movement interference caused by the width of the temperature control device. This can produce a wider high-temperature ring area and increase the covered sub-ring area of ​​the heat storage element. The temperature control nozzle and windshield of the temperature control injection assembly jointly play the role of active and passive combined temperature control to increase the high-temperature heat source, reduce the influence of cold wind, increase the wall temperature of the heat storage element, and achieve good cleaning and unblocking effects. The soot blowing device can perform soot blowing operations on the high-temperature ring area from both ends of the heat storage element, which has a better cleaning effect. The temperature control device is able to move along the track, and the temperature control device can simultaneously aim at multiple high-temperature ring areas on the heat storage element, dynamically increase the wall temperature of the heat storage element and dynamically blow the heat storage element at the same time, which is beneficial to improving the overall cleaning effect and cleaning efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 is a schematic top view of the overall structure of the present invention (the heat storage element is shown as a transparent wireframe view); Figure 2 is a schematic top view of the high-temperature ring region formed by the present invention (the heat storage element is shown as a transparent wireframe view); Figure 3 is a three-dimensional perspective schematic diagram of the main relevant structures of the present invention (the heat storage element is shown as a transparent wireframe view); Figure 4 This is a schematic structural diagram of the temperature control device of the present invention from a three-dimensional perspective; Figure 5 yes Figure 4 Detailed diagram at point A in the middle; Figure 6 yes Figure 4 A structural diagram from another angle; Figure 7 This is a schematic diagram of the structure of the temperature control device of the present invention from a top view; Figure 8 This is a schematic structural diagram of the temperature control device of the present invention from a front view angle; Figure 9 yes Figure 8 Detailed diagram at B in the middle; Figure 10 It is a three-dimensional perspective schematic diagram of the sootblowing device and the track structure of the present invention; Figure 11 It is a schematic diagram of the sootblowing device of the present invention when viewed from above.

[0021] In the figure, the accompanying drawings are marked as follows: Temperature control device 100; soot blowing device 200; track 300; heat storage element 400, high temperature ring area 401; Windshield 1, telescopic rod 11, connecting rod 12, synchronous gear 13, power connecting rod 14, outer sleeve rod 15, base side plate 16, elastic member 17; temperature control nozzle 2, fairing 21; windshield base 3; temperature control main pipe 4; temperature control conveying pipeline 5; sootblowing mobile frame 6, first medium pipeline 61, second medium pipeline 62, multi-medium coupler 63; sootblowing main pipe 7; sootblowing nozzle 8. DETAILED DESCRIPTION

[0022] The technical solution of the present invention is further described in detail below through specific implementation methods.

[0023] Example 1 like Figures 1-11 As shown, the air preheater wall temperature dynamic regulation and air energy soot blowing combined cleaning system of this embodiment includes a temperature control device 100 and a soot blowing device 200. The temperature control device 100 is used to block a part of the cold air from blowing toward the heat storage element 400 at the cold end of the air side of the air preheater to form a windproof area, so that the wall temperature of a part of the heat storage element 400 will not be affected by this part of the cold air, reducing the drop in the wall temperature of the heat storage element 400, that is, it plays a role in increasing the wall temperature of this part of the heat storage element 400; when the wall temperature of this part of the heat storage element 400 is increased, the soot blowing device 200 is used to blow soot on this part of the heat storage element 400 on the flue gas side of the air preheater using air energy or other media, so that the dust and dirt are peeled off the surface of the heat storage element 400 and flow into the downstream dust removal equipment with the flue gas, which can achieve a good cleaning effect on the heat storage element 400.

[0024] The temperature control device 100 is moved to the cold end of the air preheater to dynamically change the windshield area. Specifically, Figure 1-Figure 3 As shown, the temperature control device 100 is arranged on a track 300, which is arranged at the cold end of the air side of the air preheater. The track 300 is arranged along the radial direction of the heat storage element 400. Each group of tracks 300 for support can be set as a double row of tracks. The track 300 is used to support the temperature control device 100 to move radially along the heat storage element 400 in the air preheater to dynamically change the windshield area, and thus enable linkage between multiple groups of temperature control devices 100.

[0025] The windshield areas generated by the multiple groups of temperature control devices 100 are linked to minimize the influence of cold air on the sub-ring area behind the windshield area when the heat storage element 400 rotates, thereby forming a high-temperature ring area 401 on the heat storage element 400; specifically, Figure 1-Figure 3 As shown, multiple temperature control devices 100 are respectively arranged on different tracks 300, and the windshield areas of the multiple temperature control devices 100 can be moved to the same circumferential position of the heat storage element 400. The windshield areas of the multiple temperature control devices 100 at the same circumferential position of the heat storage element 400 together form a polygonal fan ring shape, as shown in FIG. Figure 2As shown, this polygonal fan ring-shaped windshield area increases the wall temperature of this part of the heat storage element 400, thereby forming a high-temperature ring area 401 on the heat storage element 400. Further, for example, Figure 1 As shown, the number of temperature control devices 100 is set in the air preheater according to the number of compartments on its air side and the fan size of the compartments, so that the temperature control device 100 cooperates with the compartment structure of the air preheater to form a high-temperature ring area 401 with less cold air gap for the heat storage element 400, blocking the cold air as much as possible to avoid the temperature drop of the high-temperature ring area 401.

[0026] The temperature control device 100 can block the wind when it needs to be cleaned, and should also avoid blocking the wind as much as possible when the air preheater does not need to be cleaned and is operating normally. Therefore, the specific structure of the temperature control device 100 can adopt a windshield base 3 extending to both sides of the track 300 in the length direction. The windshield base 3 is provided with an expandable and retractable windshield member 1. When the windshield members 1 of multiple temperature control devices 100 are unfolded together, they can be moved to the same circumferential position of the heat storage element 400; when the windshield function of the temperature control device 100 is not needed, the windshield member 1 is folded on the windshield base 3 to minimize the windshield area so that the air preheater can operate normally.

[0027] After multiple temperature control devices 100 form a high-temperature ring area 401 for the heat storage element 400, the flue gas on the flue gas side is not sufficient to achieve a good cleaning effect. Therefore, it is necessary to use a soot blowing device 200 to blow soot towards the high-temperature ring area 401 on the flue gas side of the air preheater, so that the soot is peeled off from the surface of the heat storage element 400 and flows into the downstream dust removal equipment with the flue gas.

[0028] The "high temperature" in the "high temperature ring area 401" in this application refers to the fact that when the heat storage element 400 rotates, it is affected by the temperature control device 100. The temperature of this sub-ring area can still maintain a relatively high temperature when passing through the air side and entering the flue gas side, such as above 207°C, so as to facilitate the final cleaning and clearing of blockages.

[0029] The combined cleaning method based on the combined cleaning system of this embodiment includes: the wind shields 3 of multiple temperature control devices 100 are simultaneously maintained in an expanded state to form multiple wind shield areas, and the multiple temperature control devices 100 move along the track 300 so that the wind shield areas formed by the multiple temperature control devices 100 are located on the track 300 at the same circumferential position of the heat storage element 400, so that the wall temperature of the ring of the heat storage element 400 is increased, thereby forming a high-temperature ring area 401 on the heat storage element 400, and then the soot blowing device 200 is sprayed toward the high-temperature ring area 401 for soot blowing; after the soot blowing operation is completed, multiple groups of temperature control devices 100 move along the track 300 to form another high-temperature ring area 401 on the heat storage element 400, and then the soot blowing device 200 is sprayed toward the high-temperature ring area 401 for soot blowing; this cycle is repeated until the cleaning operation of the heat storage element 400 is completed.

[0030] In this embodiment, a combined cleaning system and method using a temperature control device 100, a soot blowing device 200 and a track 300 is used. Compared with the concentric ring and special-shaped cold medium pipe structures in the prior art, the combined cleaning system of the present application can form a dynamically changeable high-temperature ring area 401 for the air preheater heat storage element 400 in the form of a dynamic wind shield, so that the high-temperature ring area 401 can be dynamically adjusted according to the cleaning progress. The dynamically adjusted high-temperature ring area 401 can reduce the impact of cold air on the wall temperature of this part of the heat storage element 300, so that the central ring of the high-temperature ring area 401 can always maintain a higher wall temperature, reducing the dead angle for increasing the wall temperature of the heat storage element 300. At the same time, the temperature control device 100 of the present application, capable of dynamically increasing the wall temperature of the heat storage element 400, is also compatible with most dynamic sootblowing devices 200 in the prior art. While dynamically increasing the wall temperature of the heat storage element 400, the sootblowing device 200 can also be adapted to dynamically blowing soot. The synergistic effect of the temperature control device 100 and the sootblowing device 200 can significantly reduce blind spots during the soot cleaning operation, achieving excellent soot cleaning results. Furthermore, the specific structure of the combined soot cleaning system of the present application is compact and efficient, and can be installed without significant adjustments to the existing air preheater structure. It is applicable to most existing air preheaters already in operation, demonstrating excellent applicability.

[0031] Example 2 Based on Example 1, Figure 1 As shown, since the temperature control device 100 in the present application is located in different compartment fan-shaped areas of the cold end of the air side of the air preheater, in order to ensure the sub-ring coverage range of the heat storage element 100 when the temperature control device 100 moves, the temperature control device 100 of this embodiment includes at least two groups of wind shield bases 3 and wind shield members 1, and multiple temperature control devices 100 are provided with the same number of wind shield bases 3 and wind shield members 1 to form at least two wind shield areas; the length of the wind shield base 3 on the same temperature control device 100 extending to both sides of the track 300 increases according to the direction away from the rotating axis of the heat storage element 400.

[0032] On the one hand, the temperature control device 100 includes at least two sets of wind shield bases 3 and wind shield members 1, which can form at least two high-temperature ring areas 401 for the heat storage element 400, while increasing the wall temperature of at least two high-temperature ring areas 401 and blowing soot on at least two high-temperature ring areas at the same time, thereby increasing the overall cleaning efficiency and reducing the interference time of the cleaning operation on the normal operation of the air preheater.

[0033] On the other hand, when in a fan-shaped compartment area, the multiple sets of windshield bases 3 and windshield members 1 on the temperature control device 100 can move in the fan-shaped compartment area in a cone-like shape, so that the windshield area of ​​the temperature control device 100 can avoid movement interference due to the width of the temperature control device 100 when moving, block as much heat storage element 400 area as possible, produce a wider high-temperature ring area 401, and increase the covered heat storage element 400 ring area.

[0034] It is easy to understand that the "sub-compartment area" of the cold end of the air side of the air preheater described in this application is an example made to facilitate the understanding of this application. When there is no sub-compartment area at the cold end of the air side of the air preheater, it is also possible to arrange multiple temperature control devices 100.

[0035] In the present application, a plurality of windshield bases 3 and windshield members 1 are provided on the temperature control device 100, and the length of the windshield base 3 extending to both sides of the track 300 increases gradually according to the direction away from the rotating axis of the heat storage element 400. On the one hand, at least two high-temperature ring areas 401 can be formed, thereby increasing the overall cleaning efficiency. On the other hand, the movement interference caused by the width problem of the temperature control device 100 is avoided, and a wider high-temperature ring area 401 can be generated, thereby increasing the covered sub-ring area of ​​the heat storage element 400.

[0036] Example 3 Based on Example 1 or Example 2, in this embodiment, the temperature control device 100 includes not only a passive temperature control mechanism including the windshield base 3 and the windshield member 1, but also an active temperature control mechanism, which sprays heat medium into the high-temperature ring area 401 of the heat storage element to increase the wall temperature of the heat storage element 400.

[0037] Specifically, a temperature-controlled spray assembly is provided on the windshield base 3, and the temperature-controlled spray assembly includes a temperature-controlled nozzle 2. The temperature-controlled nozzle 2 is used to spray heat medium into the high-temperature ring area 401 of the heat storage element 400 to increase the wall temperature of the heat storage element 400. The windshield 1 is installed on the rear side of the nozzle of the temperature-controlled nozzle 2. In this application, the rear side of the nozzle of the temperature-controlled nozzle 2 refers to the direction opposite to the direction of the nozzle of the temperature-controlled nozzle 2, and is also the opposite direction of the spray direction of the temperature-controlled nozzle 2. The windshield 1 extends from both sides of the temperature-controlled nozzle 2 in a direction away from the temperature-controlled nozzle 2 to block the cold air from the rear side of the nozzle of the temperature-controlled nozzle 2, thereby preventing the cold air from lowering the temperature of the heat storage element and preventing the cold air from mixing with the heat medium sprayed from the temperature-controlled nozzle 2.

[0038] In the present application, the heat medium sprayed by the temperature control nozzle 2 refers to a medium that can increase the temperature of the heat storage element, such as high-temperature and high-pressure air or water vapor above 200°C.

[0039] Furthermore, the temperature control injection assembly includes a temperature control main pipe 4, the length direction of which extends to both sides of the track 300, and temperature control nozzles 2 are installed in rows along the length direction of the temperature control main pipe 4 to increase the efficiency of the nozzles 2 in raising the wall temperature of the heat storage element 400.

[0040] Furthermore, the temperature-controlled spray assembly also includes a temperature-controlled delivery pipe 5. The temperature-controlled nozzle 2 is installed on the side wall of the temperature-controlled main pipe 4 along its length. The temperature-controlled delivery pipe 5 is connected to the side wall of the temperature-controlled main pipe 4 from the side opposite to the side where the temperature-controlled nozzle 2 is installed. The windshield base 3 can be installed on the temperature-controlled delivery pipe 5 at the connection with the temperature-controlled main pipe 4. The temperature-controlled delivery pipe 5 is passed through the windshield base 3; the windshield base 3 can also be directly welded to the side wall of the temperature-controlled main pipe 4. The temperature-controlled main pipe 4 and the temperature-controlled delivery pipe 5 form a pipe rack. The windshield base 3 is installed on the pipe rack. The pipe rack drives the windshield base 3, the temperature-controlled nozzle 2, and the windshield member 1 to move radially along the thermal storage element 400. The pipe rack is a rigid structure as a whole. The guide wheel mechanism can be directly installed on the temperature-controlled delivery pipe 5. A telescopic drive mechanism can be used to drive the entire pipe rack to move along the track 300.

[0041] Based on the above, a fairing 21 is provided on the outer periphery of the nozzle of the temperature control nozzle 2 to limit the diffusion angle of the medium ejected by the temperature control nozzle 2, so that the heat medium ejected by the temperature control nozzle 2 forms an effective ejection air curtain within the blocking range of the wind shield 1, thereby further preventing the heat medium ejected by the temperature control nozzle 2 from lowering its temperature due to mixing with cold air, increasing the concentration of the heat medium, and facilitating heating of the heat storage element.

[0042] In this embodiment, the temperature control nozzle 2 and the wind shield 1 of the temperature control spray assembly jointly play the role of active and passive combined temperature control to increase the high-temperature heat source, reduce the influence of cold wind, increase the wall temperature of the heat storage element, and achieve good dust cleaning and blockage clearing effects.

[0043] Example 4 Based on Example 1, Example 2, or Example 3, the windshield 1 of this embodiment utilizes a windshield. The windshield deploys from the windshield base 3 in the length direction of the track 300. Two windshields are rotatably provided on either side of the windshield base 3. When the windshields are retracted, they close together above the windshield base 3, thereby enclosing the temperature control nozzle 2 within the cavity formed by the two windshields closing together, preventing dirt from entering the temperature control nozzle 2 when it is not in operation. The sides of the windshield away from the windshield base 3 are tilted upward to form an arc-shaped edge. The arc-shaped edge allows the two wings of the windshield to form guide plates, directing cold air toward the sides of the windshield as it passes through. This further prevents cold air from mixing with the high-temperature medium ejected by the temperature control nozzle 2, while also reducing the wind pressure on the windshield 1 and facilitating the closing of the windshield. In addition, the bottom of the windshield base 3 may be provided with an arc-shaped plate surface to guide the cold air to a certain extent.

[0044] Specifically, the temperature control device 100 includes a telescopic rod 11, a connecting rod 12, a synchronous gear 13 and a power connecting rod 14. The telescopic rod 11 is telescopic along the length direction of the track 300. The two ends of the connecting rod 12 are respectively hinged to the telescopic rod 11 and one of the windshields. The two synchronous gears 13 are respectively hinged to the ends of the two windshields. The two synchronous gears 13 are meshed with each other, and the two power connecting rods 14 are hinged to each other. The two power connecting rods 14 are respectively hinged to the two windshields.

[0045] The telescopic rod 11 and the connecting rod 12 serve as driving devices for expanding or retracting the windshield. An outer rod 15 is also provided at the bottom of the windshield base 3 or on the pipe rack. The telescopic rod 11 can be driven by the telescopic rod and can be slidably arranged within the outer rod 15. The telescopic rod 11 is extended and retracted in a direction perpendicular to the rotating axis of the windshield member 1. The two ends of the connecting rod 12 are respectively hinged to the telescopic rod 11 and the plate surface of the windshield member 1 away from the temperature control nozzle 2, so that when the telescopic rod is extended and retracted, the windshield can be pulled or pushed to rotate on the windshield base through the connecting rod 12.

[0046] Synchronizing gear 13 facilitates the synchronous rotation of the two windshields, allowing them to be deployed or retracted at the same angle, thus reducing the number of drive devices (telescopic rod 11 and connecting rod 12). The gear meshing action also provides a certain degree of locking in the deployed state of windshield 1, enabling windshield 1 to block higher-pressure cold air when deployed. For example, synchronous gear 13 can be a sector gear, which has a larger tooth structure.

[0047] The power connecting rod 14 forms a double connecting rod. When one windshield rotates, it will pull and push the other windshield to rotate. Cooperating with the synchronous gear 13, the two windshields can rotate at the same time.

[0048] Based on the above, two base side panels 16 can be set at the two end positions on the windshield base 3, which are also the two end positions of the temperature control main pipe 4. When the two windshield members 1 are closed away from the sides of the temperature control nozzle 2, the base side panels 16 can block the gaps on both sides of the two windshield members 1.

[0049] Based on the above, an elastic member 17 (such as a spring) is further provided between the windshield and the outer rod 15, or between the windshield member 1 and the pipe rack, so that when the windshield member 1 is rotated and retracted, it is necessary to overcome a certain elastic force of the elastic member 17, so that the windshield member 1 can block cold air with stronger pressure when it is unfolded.

[0050] In other embodiments, the windshield member 1 may also be in the form of an airbag or an openable and closable louver grille. For example, when the airbag is inflated, it can fill the internal space of the windshield base 3 to block the cold air.

[0051] Example 5 Based on Example 1 or Example 2, Figure 3As shown, the soot blowing device 200 of this embodiment is arranged at the cold end of the flue gas side of the air preheater and / or the hot end of the flue gas side of the air preheater to simultaneously blow soot to the high-temperature ring area 401 from both ends of the heat storage element 400, which has a better cleaning effect.

[0052] Example 6 Based on Example 1 or Example 2 or Example 5, Figure 10 、 Figure 11 As shown, the sootblowing device 200 of this embodiment includes a sootblowing movable frame 6 and a sootblowing injection assembly. The sootblowing movable frame 6 is arranged on another track 300, and the track 300 is used to support the sootblowing movable frame 6 to move radially along the heat storage element 400 in the air preheater; a plurality of groups of sootblowing injection assemblies are arranged at intervals on the sootblowing movable frame 6 to simultaneously blow soot on multiple high-temperature ring areas 401.

[0053] Specifically, the sootblowing injection assembly includes a sootblowing mother pipe 7 and a sootblowing nozzle 8. At least two sootblowing mother pipes 7 are provided on the sootblowing movable frame 6. The number of sootblowing mother pipes 7 is consistent with the number of windshield bases 3 on the temperature control assembly 100. The length direction of the sootblowing mother pipe 7 extends to both sides of the track 300. For example, an arc-shaped pipe can be used. The sootblowing nozzles 8 are installed in rows along the length direction of the sootblowing mother pipe 7. The pipe spacing of the sootblowing mother pipe 7 is set according to the row spacing of the windshield base 3 on the temperature control device 100, so that the sootblowing nozzles 8 can blow soot to multiple high-temperature ring areas 401 at the same time.

[0054] Furthermore, the sootblowing movable frame 6 is in the form of a pipe rack and also includes a sootblowing conveying pipeline. The sootblowing main pipe 7 and the sootblowing conveying pipeline form a pipe rack. The pipe rack as a whole is a rigid structure. The guide wheel mechanism can be directly installed on the sootblowing conveying pipeline. The telescopic drive mechanism can be used to drive the entire sootblowing movable frame 6 to move along the track 300.

[0055] Furthermore, the soot blowing device 200 uses pulse medium for soot blowing, such as Figure 10 、 Figure 11 As shown, the sootblowing movable frame 6 is connected to a first medium pipeline 61 and a second medium pipeline 62. The first medium pipeline 61 can be moved with the sootblowing movable frame 6 in the form of a multi-joint robotic arm, and the second medium pipeline 62 can be connected to a driving mechanism. The media provided by the first medium pipeline 61 and the second medium pipeline 62 are coupled in a multi-media coupler 63 (or a pulse transmitter is used) to become a pulse medium.

[0056] Based on the combined cleaning method of the present application, after the multiple temperature control devices 100 move along the track 300, the soot blowing device 200 also moves along the track 300, so that the soot blowing device 200 can effectively align with the high-temperature ring area 401 of the heat storage element 400 for soot blowing operations.

[0057] In this embodiment, the temperature control device 100 is able to move along the track 300, and the temperature control device 100 can simultaneously aim at multiple high-temperature ring areas 401 on the heat storage element 400, dynamically increase the wall temperature of the heat storage element 400 and dynamically blow the heat storage element 400 at the same time, which is beneficial to improving the overall cleaning effect and cleaning efficiency.

[0058] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to preferred embodiments, ordinary technicians in the field should understand that the specific implementation methods of the present invention can still be modified or some technical features can be replaced by equivalents without departing from the spirit of the technical solutions of the present invention. They should all be included in the scope of the technical solutions claimed for protection by the present invention.

Claims

1. An air preheater wall temperature dynamic adjustment and air energy soot blowing combined with soot cleaning system, characterized in that: The invention comprises a temperature control device, a soot blowing device and a track, wherein the track is used to support the temperature control device to move radially along the heat storage element in the air preheater, and multiple temperature control devices are respectively arranged on different tracks; the temperature control device is used to block a part of the cold air from blowing toward the heat storage element at the air side cold end of the air preheater, and the temperature control device comprises a wind shield base extending in the longitudinal direction to both sides of the track, and the wind shield base is provided with a deployable and retractable wind shield. When the wind shields of multiple temperature control devices are deployed at the same circumferential position of the heat storage element, they are used together to increase the wall temperature of the heat storage element, thereby forming a high-temperature ring area on the heat storage element; The soot blowing device is used to blow soot on the high-temperature ring area on the flue gas side of the air preheater.

2. The air preheater wall temperature dynamic adjustment and air energy soot blowing combined soot cleaning system according to claim 1 is characterized in that: The temperature control device includes a temperature control mobile frame, on which at least two groups of windshield bases are provided. Multiple temperature control devices are provided with the same number of windshield bases to form at least two high-temperature ring areas; the length of the windshield base on the same temperature control device extending toward both sides of the track increases gradually in the direction away from the rotating shaft of the heat storage element.

3. The air preheater wall temperature dynamic adjustment and air energy soot blowing combined soot cleaning system according to claim 1 or 2 is characterized in that: A temperature control spray assembly is provided on the windshield base. The temperature control spray assembly includes a temperature control nozzle. The temperature control nozzle is used to spray heat medium into the high-temperature ring area of ​​the heat storage element to increase the wall temperature of the heat storage element.

4. The air preheater wall temperature dynamic adjustment and air energy soot blowing combined soot cleaning system according to claim 3 is characterized in that: The temperature control injection assembly includes a temperature control main tube, the length direction of the temperature control main tube extends to both sides of the track, and the temperature control nozzles are installed in rows along the length direction of the temperature control main tube.

5. The air preheater wall temperature dynamic adjustment and air energy soot blowing combined soot cleaning system according to claim 1 or 2 is characterized in that: The windshield member adopts a windshield plate, which is deployed on the windshield base in the direction of the track length. Two windshield plates are rotatably provided on both sides of the windshield base. When the windshield plates are folded, they are closed above the windshield base. The side of the windshield plate away from the windshield base is set as an arc-shaped warped edge.

6. The air preheater wall temperature dynamic adjustment and air energy soot blowing combined soot cleaning system according to claim 5 is characterized in that: The temperature control device includes a telescopic rod, a connecting rod, a synchronous gear and a power connecting rod. The telescopic rod is telescopic and retracts along the length direction of the track. The two ends of the connecting rod are respectively hinged to the telescopic rod and one of the windshields. The two synchronous gears are respectively hinged to the ends of the two windshields. The two synchronous gears are meshed with each other. The two power connecting rods are hinged to each other, and the two power connecting rods are respectively hinged to the two windshields.

7. The air preheater wall temperature dynamic adjustment and air energy soot blowing combined soot cleaning system according to claim 2 is characterized in that: The soot blowing device is arranged at the cold end of the flue gas side of the air preheater and / or the hot end of the flue gas side of the air preheater.

8. The air preheater wall temperature dynamic adjustment and air energy soot blowing combined soot cleaning system according to claim 2 or 7 is characterized in that: The sootblowing device includes a sootblowing movable frame and a sootblowing injection assembly. The sootblowing movable frame is arranged on another track, and the track is used to support the sootblowing movable frame to move radially along the heat storage element in the air preheater; multiple groups of sootblowing injection assemblies are arranged at intervals on the sootblowing movable frame to simultaneously blow soot to multiple high-temperature ring areas.

9. The air preheater wall temperature dynamic adjustment and air energy soot blowing combined soot cleaning system according to claim 8 is characterized in that: The sootblowing injection assembly includes a sootblowing mother pipe and a sootblowing nozzle. At least two sootblowing mother pipes are provided on the sootblowing movable frame. The length direction of the sootblowing mother pipe extends to both sides of the track. The sootblowing nozzles are installed in rows along the length direction of the sootblowing mother pipe. The pipe spacing of the sootblowing mother pipes is set according to the row spacing of the windshield base on the temperature control device, so that the sootblowing nozzles can blow soot to multiple high-temperature ring areas at the same time.

10. A combined soot cleaning method for air preheater wall temperature dynamic regulation and air energy soot blowing, characterized in that: Based on the air preheater wall temperature dynamic regulation and air energy soot blowing combined cleaning system as described in any one of claims 1 to 9, the combined cleaning method includes: the wind shields of multiple temperature control devices are kept in an expanded state at the same time to form multiple wind shield areas, and multiple temperature control devices move along the track so that the multiple wind shield areas are in the same circumferential position of the heat storage element, thereby forming the high-temperature ring area on the heat storage element, and then the soot blowing device is made to spray a jet toward the high-temperature ring area for soot blowing; multiple groups of temperature control devices move along the track to form another high-temperature ring area on the heat storage element, and then the soot blowing device is made to spray a jet toward the high-temperature ring area for soot blowing; this cycle is repeated until the cleaning operation of the heat storage element is completed.

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