Intelligent soot blowing system for air preheater

Abstract

The application provides an air preheater intelligent soot blowing system, and relates to the field of air preheaters.The system comprises a heat transfer element blockage detection module, a soot blowing module and a visual monitoring module.The heat transfer element blockage detection module is used to detect the specific position of the blockage of the heat transfer element of the air preheater.The soot blowing module is used to clean the blockage in the heat transfer element.The visual monitoring module is used to monitor the blockage and loss of the heat transfer element of the air preheater and the surface temperature of the heat transfer element in real time.The modules are automatically interlocked and controlled through a main control cabinet.When the heat transfer element blockage detection module detects that blockage occurs in a certain area of the air preheater, the intelligent soot blowing system timely controls the soot blower to directly move to the blocked area and adopts a corresponding blowing mode for treatment.Compared with the current artificial overall blowing mode, the system is more efficient, more intelligent, more accurate in judgment, further reduces the amount of blowing medium, and provides a reliable guarantee for the energy saving, emission reduction and green operation of the boiler.

Description

TECHNICAL FIELD

[0001] The present application belongs to the field of air preheater, in particular to an intelligent soot blowing system of air preheater. BACKGROUND

[0002] At present, the air preheater blockage problem has become a common and stubborn problem, and the air preheater congestion has been a pain point for the operation of the unit. The reasons for the blockage are various. With the large popularization and application of boiler denitration devices, the residual ammonia and sulfur trioxide in the flue gas will produce ammonium bisulfate, which will have a serious negative impact on the rotary preheater. The heat transfer elements of the preheater will be corroded and blocked, and finally the heat transfer elements will be damaged to different degrees, which will have an important impact on the normal operation of the preheater and the boiler.

[0003] At present, the main treatment scheme for the blockage of the heat transfer elements of the air preheater is to increase the height of the cold end element and to use high-pressure water flushing. However, with the decline of the boiler coal quality and the unstable operation of the ammonia injection equipment, ammonium bisulfate will deposit in a certain area of the cold end element of the air preheater. With the continuous adsorption of the ash, the entire element will be blocked, which will continuously increase the operating resistance of the air preheater and gradually reduce the heat exchange efficiency. Once it is realized that the blockage is serious, the overall high-pressure soot blowing method will have little effect, and the blind increase of the flushing pressure when using the online flushing method will also damage the element and cause irreversible impact. SUMMARY

[0004] The technical problem to be solved by the present application is to accurately locate and detect the specific position of the blockage of the heat transfer elements of the air preheater, to timely control the movement of the soot blower to the blocked area, and to take appropriate blowing and cleaning methods.

[0005] In order to solve the above technical problems, the present application provides an intelligent soot blowing system of air preheater, which comprises a heat transfer element blockage detection module and a soot blowing module. The heat transfer element blockage detection module is used to detect the specific position of the blockage of the heat transfer elements of the air preheater. The soot blowing module is used to blow and clean the blockage in the heat transfer elements.

[0006] The soot blowing module comprises a soot blower, a blowing medium supply device and a main control cabinet. The soot blower comprises a soot blowing gun pipe, an external telescopic pipe, an external running car and a wall box. The wall box and the external running car are located outside the air preheater shell. The external running car is fixed on the external telescopic pipe. A first through hole is formed in the air preheater shell. One end of the external telescopic pipe is connected with the wall box, and the other end is inserted into the first through hole to enter the inside of the air preheater shell. The soot blowing gun pipe passes through the first through hole of the air preheater shell and the external telescopic pipe in sequence, and is fixedly connected with the internal interface of the wall box. The blowing medium interface on the outer side of the wall box is connected with the blowing medium supply device. A valve is arranged on the soot blowing gun pipe. The main control cabinet controls the movement of the external running car and the opening and closing of the valve.

[0007] The outer telescopic pipe is movable, the outer car is fixedly installed on the outer telescopic pipe, drives the outer telescopic pipe and the wall box to move forward and backward, the position of the outer telescopic pipe relative to the air preheater shell changes, thereby driving the wall box and the soot blowing gun pipe to move to the blocking position along the moving direction of the outer telescopic pipe.

[0008] Further, when the purge medium provided by the purge medium supply device is steam, it is defined as a steam soot blowing module, and the purge medium supply device is specifically a steam source supply device; when the purge medium provided by the purge medium supply device is high-pressure water, it is defined as a high-pressure water soot blowing module, and the high-pressure water is provided by a high-pressure water pump.

[0009] Further, in the high-pressure water soot blowing module, the soot blower is arranged at the cold end of the air preheater, and the high-pressure water pump is connected with the power supply device, the water supply device and the main control cabinet; the number of the steam soot blowing modules is two, and the two soot blowers are arranged at the cold end and the hot end of the air preheater respectively.

[0010] Since the cold end of the air preheater is more difficult to clean than the hot end, it is preferred to arrange the high-pressure water soot blowing module and the steam soot blowing module at the cold end of the air preheater, thereby improving the cleaning efficiency.

[0011] Further, the heat transfer element blocking detection module comprises an air preheater heat transfer element blocking detection device, a proximity switch and a control module.

[0012] The air preheater heat transfer element blocking detection device comprises a full-pressure detection pipe, a static pressure detection pipe, an outer furnace telescopic pipe, an outer furnace car and an electromagnetic valve box, the electromagnetic valve box and the outer furnace car are located outside the air preheater shell, the outer furnace car is fixed on the outer furnace telescopic pipe, a second through hole is formed in the air preheater shell, one end of the outer furnace telescopic pipe is connected with the electromagnetic valve box, and the other end is inserted into the second through hole and enters the inside of the air preheater shell. The full-pressure detection pipe and the static pressure detection pipe pass through the second through hole of the air preheater shell, the outer furnace telescopic pipe and the electromagnetic valve box in sequence, electromagnetic valves are arranged on the full-pressure detection pipe and the static pressure detection pipe, the electromagnetic valve box controls the opening and closing of the electromagnetic valves, and a pressure transmitter is arranged in the electromagnetic valve box.

[0013] The outer furnace telescopic pipe is movable, the outer furnace car is fixedly installed on the outer furnace telescopic pipe, drives the outer furnace telescopic pipe and the electromagnetic valve box to move forward and backward, the position of the outer furnace telescopic pipe relative to the air preheater shell changes, thereby driving the full-pressure detection pipe and the static pressure detection pipe to move along the moving direction of the outer furnace telescopic pipe.

[0014] The full-pressure detection pipe and the static pressure detection pipe are connected with the pressure transmitter, and the difference between the full pressure and the static pressure is obtained through the pressure transmitter, that is, the dynamic pressure value of the detection position is obtained.

[0015] The proximity switch is located at the side of the rotation shaft of the air preheater rotor, and the outer side of the rotation shaft is provided with metal sheets corresponding to the positions of the cells of each rotor in the air preheater, the number of the cells being the same as that of the metal sheets.

[0016] The proximity switch is fixed, and the air preheater rotor and the rotation shaft rotate synchronously. By providing a plurality of metal sheets corresponding to the positions of the cells of each rotor in the air preheater on the outer side of the rotation shaft of the air preheater, when each metal sheet on the outer side of the rotation shaft passes the proximity switch, the proximity switch will record a value for the corresponding cell number.

[0017] Further, one end of the total pressure detection pipe is a 90° elbow pipe and faces the direction of the airflow, thereby improving the sensitivity of detection and reducing the influence of disturbance.

[0018] Further, the air preheater heat transfer element blockage detection device further comprises a back blowing pipe, which is in communication with the total pressure detection pipe and the static pressure detection pipe.

[0019] Further, the off-furnace car moves on the off-furnace bracket.

[0020] The off-furnace car drives the off-furnace telescopic pipe and the electromagnetic valve box to move forward and backward, thereby driving the total pressure detection pipe and the static pressure detection pipe to move, detecting the total pressure and the static pressure at the corresponding positions, and realizing the detection of the blockage of the air preheater.

[0021] Further, it further comprises a visual monitoring module, which comprises a hot end camera device, a cold end camera and thermal imaging device, and a monitor screen control box, wherein the monitor screen control box is connected with the hot end camera device and the cold end camera and thermal imaging device.

[0022] The hot end camera device is used for online real-time monitoring of the running conditions of the heat transfer elements and the sealing sheets in the hot end of the air preheater, and the cold end camera and thermal imaging device are used for real-time monitoring of the running conditions of the heat transfer elements and the sealing sheets in the cold end of the air preheater and measuring the surface temperature of the heat transfer elements in the cold end.

[0023] Further, the control module is connected with the main control cabinet.

[0024] Further, the hot end camera device is a camera, and the cold end camera and thermal imaging device comprises a camera and an infrared thermal imager.

[0025] Beneficial effects:

[0026] (1) The intelligent soot blowing system of the air preheater provided by the application comprises a heat transfer element blockage detection module, a steam soot blowing module, a high-pressure water soot blowing module and a visual monitoring module, four operation modules realize automatic interlocking control through a main control cabinet, when the heat transfer element blockage detection module detects that blockage occurs in a certain area of the air preheater, the intelligent soot blowing system can timely control the soot blower to directly move to the blocked area and take corresponding blowing mode for processing, compared with the current artificial overall blowing mode, the time efficiency is faster, it is more intelligent and the judgment is more accurate, and the use amount of blowing medium is further reduced, thereby providing reliable guarantee for green operation of energy saving and emission reduction of the boiler.

[0027] During operation, the blockage condition of the heat transfer element of the air preheater gradually expands with the increase of the operation time, when slight blockage occurs, the processing effect is better, the intelligent soot blowing system can timely judge and process in the initial stage of blockage of the air preheater, the sensitivity is high, and the subsequent blockage condition is avoided to be aggravated, thereby better preventing the air preheater from being blocked.

[0028] (2) The heat transfer element blockage detection module provided by the application adopts a mobile dynamic pressure detection principle, can perform online mobile detection, detects the dynamic pressure value in each heat transfer element package area, is arranged at the flue gas outlet position of the air preheater, and compares the dynamic pressure data of each heat transfer element set position with original data to accurately position the blockage position, thereby providing judgment and blowing basis for the blowing module. Compared with the fixed structure, the mobile heat transfer element blockage detection module has larger detection area, the number of detection pipelines is greatly reduced, the equipment is more integrated, operation is simple and flexible, the on-site installation workload is smaller, the detection of a certain specific area is more accurate, the detection data is more stable, the detection efficiency is higher, the detection can be quickly and repeatedly detected, the occupied installation space is smaller and more portable.

[0029] The concept, specific structure and generated technical effects of the application will be further described below in combination with the drawings, so that the purpose, features and effects of the application can be fully understood. BRIEF DESCRIPTION OF DRAWINGS

[0030] Figure 1 The structure schematic view of the heat transfer element blockage detection device for the air preheater;

[0031] Figure 2 The placement position schematic view of the heat transfer element blockage detection device for the air preheater relative to the air preheater;

[0032] Figure 3 The placement position schematic view of the proximity switch relative to the air preheater rotor;

[0033] Figure 4 The Figure 3 The schematic view of the E direction;

[0034] Figure 5The schematic diagram of the air preheater rotor bin;

[0035] Figure 6 The structural schematic diagram of the soot blower;

[0036] Figure 7 The steam soot blowing module control principle diagram;

[0037] Figure 8 The high-pressure water soot blowing module control principle diagram;

[0038] Figure 9 The air preheater intelligent soot blowing system control principle diagram;

[0039] Reference signs:

[0040] 1, full pressure detection pipe; 2, static pressure detection pipe; 3, back blowing pipe; 4, electromagnetic valve box; 5, off-premises car; 6, off-premises bracket; 7, off-premises sealing sleeve; 8, in-premises support pipe; 9, proximity switch; 10, off-premises telescopic pipe; 11, air preheater shell; 12, bin; 13, gun pipe one; 14, gun pipe two; 15, internal gun pipe support; 16, external sealing sleeve; 17, external bracket; 18, external car; 19, wall box; 20, external telescopic pipe; 21, soot blower; 22, steam source supply equipment; 23, main control cabinet; 24, thermometer; 25, pressure gauge; 26, high-pressure water pump; 27, water supply equipment; 28, power supply equipment; 29, air preheater heat transfer element blockage detection device; 30, control module; 31, hot end camera device; 32, cold end camera and thermal imaging device; 33, monitoring screen control box; 34, rotating shaft; 35, rotor; 36, metal sheet. DETAILED DESCRIPTION

[0041] The application will be further described below in connection with specific embodiments. It should be understood that these embodiments are only used to explain the application and not used to limit the scope of the application. Furthermore, it should be understood that after reading the content of the application, those skilled in the art can make various modifications or changes to the application, and these equivalent forms also fall within the scope of the appended claims.

[0042] In the drawings, the same or similar components are denoted by the same reference numerals, and components having the same structure or function are denoted by similar reference numerals. The size and thickness of each component shown in the drawings are arbitrarily shown, and the application does not limit the size and thickness of each component. In order to make the drawing clearer, the thickness of some components is appropriately exaggerated in some places in the drawing.

[0043] Examples:

[0044] As Figures 1 to 9As shown, in a preferred embodiment, the present application provides an air preheater intelligent soot blowing system, comprising a heat transfer element blockage detection module, a soot blowing module and a visual monitoring module, the heat transfer element blockage detection module is used to detect the specific position of the blockage of the heat transfer element of the air preheater, the soot blowing module is used to clean the blockage in the heat transfer element, and the visual monitoring module is used to monitor the blockage and wear of the heat transfer element of the air preheater and the surface temperature of the heat transfer element in real time.

[0045] The soot blowing module comprises a soot blower 21, a blowing medium supply device and a main control cabinet 23. The soot blower 21 comprises a soot blowing gun pipe, an external telescopic pipe 20, an external running car 18, a wall box 19, an external sealing sleeve 16 and an internal gun pipe support 15. The wall box 19 and the external running car 18 are located outside the air preheater shell 11. The external telescopic pipe 20 is movable relative to the position of the air preheater shell. The external running car 18 is fixed on the external telescopic pipe 20 and drives the external telescopic pipe 20 and the wall box 19 to move forward and backward. A first through hole is formed on the air preheater shell. The external sealing sleeve 16 is welded at the first through hole. The internal gun pipe support 15 is located inside the air preheater shell 11 and is fixed on the air preheater shell 11. One end of the external telescopic pipe 20 is connected with the wall box 19, and the other end penetrates into the external sealing sleeve 16 and enters the internal gun pipe support 15. The external telescopic pipe 20 is movable in the external sealing sleeve 16 and the internal gun pipe support 15. The soot blowing gun pipe penetrates through the first through hole on the air preheater shell 11, the external telescopic pipe 20 and an internal interface of the wall box 19 in sequence and is fixed. An external blowing medium interface on the wall box 19 is connected with the blowing medium supply device. A valve is arranged on the soot blowing gun pipe. The main control cabinet 23 controls the movement of the external running car 18 and the opening and closing of the valve.

[0046] The external telescopic pipe 20 is a hollow tubular structure. The external running car 18 is fixedly installed on the external telescopic pipe 20 and drives the external telescopic pipe 20 and the wall box 19 to move forward and backward on the external bracket 17, so as to drive the soot blowing gun pipe to move to the blockage position along the movement direction of the external telescopic pipe 20 and clean the blockage position.

[0047] The soot blowing gun pipe comprises two gun pipes, namely a gun pipe one 13 and a gun pipe two 14. The gun pipe one 13 and the gun pipe two 14 are provided with nozzles and are movable. The gun pipe one 13 and the gun pipe two 14 are installed in the internal gun pipe support 15 and penetrate through the external telescopic pipe 20 and are fixed with the internal interface of the wall box 19. The external blowing medium interface of the wall box 19 is connected with the blowing medium supply device and is leakproof. The internal gun pipe support 15 is located inside the air preheater shell 11.

[0048] The internal gun pipe support 15 is composed of a channel steel and a pipe clamp. The pipe clamp is installed on the channel steel. The soot blowing gun pipe is slidable in the internal gun pipe support 15, so as to prevent the soot blowing gun pipe from vibrating greatly during blowing,

[0049] During on-site installation, first position and fix the external bracket 17 in the corresponding position. Then, open the first through hole at the corresponding position of the air preheater housing 11 and seal and weld the external sealing sleeve 16. Insert the first barrel 13 and the second barrel 14 into the hole of the external sealing sleeve 16 together. Install the internal barrel bracket 15 and position the first barrel 13 and the second barrel 14 so that they can move back and forth. Seal and weld the external sealing sleeve 16 to the air preheater housing 11. The first barrel 13 and the second barrel 14 pass through the external telescopic tube 20 and are connected and fixed to the internal purging medium interface on the wall box 19. After the external carriage 18, the external telescopic tube 20 and the wall box 19 are assembled as a whole, they are installed and positioned with the external bracket 17 so that the external telescopic tube 20 can move back and forth under the drive of the external carriage 18.

[0050] When the purging medium supplied by the purging medium supply equipment is steam, it is defined as a steam soot blowing module, and the purging medium supply equipment is specifically a steam source supply equipment 22; when the purging medium supplied by the purging medium supply equipment is high-pressure water, it is defined as a high-pressure water soot blowing module, and the high-pressure water is supplied by a high-pressure water pump 26.

[0051] In the high-pressure water soot blowing module, the soot blower 21 is set at the cold end of the air preheater, and the high-pressure water pump 26 is connected to the power supply equipment 28, the water supply equipment 27 and the main control cabinet 23; there are two steam soot blowing modules, with the two soot blowers 21 set at the cold end and the hot end of the air preheater respectively.

[0052] Since cold-end blockage of the air preheater is more difficult to clean than hot-end blockage, it is preferable to install high-pressure water soot blowing module and steam soot blowing module at the cold end of the air preheater to improve cleaning efficiency.

[0053] like Figure 7 The diagram shows the control principle of the steam soot blowing module. One soot blower 21 is installed at both the cold and hot ends of the air preheater. The soot blowing nozzles are connected to the steam supply equipment 22. Thermometers 24, pressure gauges 25, and valves are installed on nozzles 13 and 14 within each soot blower 21. All thermometers 24, pressure gauges 25, and valves are connected to the main control cabinet 23. When the heat transfer element blockage detection module detects blockage in the inner area of ​​the air preheater, the main control cabinet 23 calculates the radial distance to the blockage location coordinates based on the preset starting position. The external trolley 18 moves nozzles 13 and 14 together to reach the blockage area inside the heat transfer element, opening only the valve on nozzle 13 for purging. When blockage is detected in the outer area of ​​the air preheater, the external trolley 18 moves nozzles 13 and 14 to the blockage area, opening only the valve on nozzle 14 for purging, thus achieving independent control of the inner and outer purging of the air preheater.

[0054] The steam temperature and pressure detection is provided on the soot blowing gun pipe. If the steam parameters do not meet the design requirements of the blowing, the valve is closed to prevent the heat transfer element from being blown and damaged.

[0055] As shown in Fig. 1, the soot blowing module is installed on the cold end of the air preheater. The soot blowing gun pipe is connected with the high-pressure water pump 26. The valves on the gun pipe one 13 and the gun pipe two 14 are connected with the main control cabinet 23. The high-pressure water pump 26 is connected with the water supply equipment 27 and the power supply equipment 28. Figure 8 As shown in Fig. 2, when the heat transfer element blockage detection module detects that the blockage occurs in the inside region of the air preheater, the gun pipe one 13 and the gun pipe two 14 are moved to the corresponding positions to open only the valve on the gun pipe one 13 to flush. If the blockage region is detected to occur outside the heat transfer element, the gun pipe one 13 and the gun pipe two 14 are moved to the blockage region to open only the valve on the gun pipe two 14 to flush. If the overall cleaning is required, the valve on the gun pipe one 13 is opened first, and then the valve on the gun pipe two 14 is opened to complete the overall blowing in the alternate cleaning mode.

[0056] The heat transfer element blockage detection module includes the air preheater heat transfer element blockage detection device 29, the proximity switch 9 and the control module 30.

[0057] The air preheater heat transfer element blockage detection device 29 includes three full-pressure detection pipes 1, one static pressure detection pipe 2, the furnace outer telescopic pipe 10, the furnace outer trolley 5, the electromagnetic valve box 4, the furnace outer sealing sleeve pipe 7, the furnace inner support pipe 8 and the back blowing pipe 3. The furnace outer trolley 5 is fixedly installed on the furnace outer telescopic pipe 10 to drive the furnace outer telescopic pipe 10 and the electromagnetic valve box 4 to move forward and backward. The second through hole is formed on the air preheater shell, and the furnace outer sealing sleeve pipe 7 is sealingly welded at the second through hole. The furnace inner support pipe 8 is located inside the air preheater shell 11 and is sleeved outside the furnace outer telescopic pipe. The furnace inner support pipe 8 is fixed on the air preheater shell 11. One end of the furnace outer telescopic pipe 10 is connected with the electromagnetic valve box 4, and the other end of the furnace outer telescopic pipe 10 penetrates through the furnace outer sealing sleeve pipe 7 and is connected with the furnace inner support pipe 8. The full-pressure detection pipe 1 and the static pressure detection pipe 2 penetrate through the furnace inner support pipe 8, the through hole on the air preheater shell 11, the furnace outer telescopic pipe 10 and the electromagnetic valve box 4 in sequence. The electromagnetic valves are arranged on the full-pressure detection pipe 1 and the static pressure detection pipe 2. The electromagnetic valve box 4 controls the opening and closing of the electromagnetic valves. The pressure transmitter is arranged in the electromagnetic valve box 4.

[0058] The full-pressure detection pipe 1 and the static pressure detection pipe 2 are connected with the pressure transmitter to obtain the dynamic pressure value of the detection position.

[0059] One end of the full-pressure detection pipe 1 is a 90° elbow pipe and faces the air flow direction, so as to improve the detection sensitivity.

[0060] The static pressure detection tube 2 is a straight tube for measuring the air pressure in the whole space.

[0061] The back flushing pipe 3 is communicated with the total pressure detection tube 1 and the static pressure detection tube 2, and the electromagnetic valve door of the back flushing pipe 3 is opened to introduce compressed air for back flushing to prevent pipe blockage when not detecting.

[0062] The out-of-furnace running pipe 5 drives the out-of-furnace telescopic pipe and the electromagnetic valve box 4 to move forward and backward on the out-of-furnace bracket 6, thereby driving the total pressure detection tube 1 and the static pressure detection tube 2 to move to detect the total pressure and the static pressure at the corresponding positions, and to realize the detection of the blockage of the air preheater.

[0063] The out-of-furnace telescopic pipe 10 is a hollow tubular structure, and the total pressure detection tube 1 and the static pressure detection tube 2 are movably installed in the in-furnace support pipe 8 and pass through the out-of-furnace telescopic pipe 10 to be fixedly connected with the corresponding interfaces on the electromagnetic valve box 4 without leakage, the in-furnace support pipe 8 is located inside the air preheater shell 11, a strip-shaped slot is formed on the in-furnace support pipe 8, the length of the strip-shaped slot is consistent with the displacement amount of the bent pipe end of the total pressure detection tube, and a certain amount of allowance is left, and the bent pipe end extends out of the strip-shaped slot, thereby detecting the total pressure at the corresponding position.

[0064] During on-site installation, the out-of-furnace bracket 6 is first positioned and fixed, a second through hole is formed at the corresponding position of the air preheater shell 11 and the out-of-furnace sealing sleeve 7 is sealingly welded, the total pressure detection tube 1 and the static pressure detection tube 2 are inserted into the out-of-furnace telescopic pipe 10 and are fixedly connected with the detection interfaces reserved on the electromagnetic valve box 4, the out-of-furnace telescopic pipe 10 is sealed through the out-of-furnace sealing sleeve 7, then the total pressure detection tube 1 and the static pressure detection tube 2 and the end of the out-of-furnace telescopic pipe 10 away from the electromagnetic valve box 4 are inserted into the air preheater through the out-of-furnace sealing sleeve 7, the in-furnace support pipe 8 is installed, the in-furnace support pipe 8 is sleeved outside the out-of-furnace telescopic pipe 10 and is fixed on the air preheater shell 11, the diameter of the in-furnace support pipe 8 is slightly larger than the diameter of the out-of-furnace telescopic pipe 10, and the in-furnace support pipe 8 is sealingly fixed through the out-of-furnace sealing sleeve 7 to play a role of limiting and supporting the total pressure detection tube 1, the static pressure detection tube 2 and the out-of-furnace telescopic pipe 10, so that they can only move forward and backward and cannot swing left and right. The out-of-furnace telescopic pipe 10, the out-of-furnace running pipe 5 and the electromagnetic valve box 4 are welded and fixed to form an integral structure and are installed on the out-of-furnace bracket 6, so that they can also move forward and backward and cannot swing left and right, the out-of-furnace running pipe 5 drives the out-of-furnace telescopic pipe and the electromagnetic valve box 4 to move forward and backward, thereby driving the total pressure detection tube 1 and the static pressure detection tube 2 to move, the electromagnetic valves on the detection tubes are controlled to be opened and closed through the electromagnetic valve box 4, the electromagnetic valves on the corresponding pipelines are opened when detecting, the back flushing pipe 3 is communicated with the total pressure detection tube 1 and the static pressure detection tube 2, and the electromagnetic valve door of the back flushing pipe 3 is opened to introduce compressed air for back flushing to prevent pipe blockage when not detecting.

[0065] The proximity switch 9 is located at the side of the rotating shaft 34 of the air preheater rotor 35, and a plurality of metal sheets 36 corresponding to the positions of the cells 12 of each rotor 35 in the air preheater are arranged on the outside of the rotating shaft 34, and the number of cells is the same as the number of metal sheets. The control module 30 is connected with the air preheater heat transfer element blockage detection device 29 and the proximity switch 9, and the control module 30 controls the movement and start-stop of the off-rail car 5, and controls the direction and displacement amount of the movement.

[0066] The proximity switch 9 is fixed, and the air preheater rotor 35 and the rotating shaft rotate synchronously. By arranging a plurality of metal sheets 36 corresponding to the positions of the cells 12 of each rotor 35 in the air preheater on the outside of the rotating shaft 34, when each metal sheet 36 on the outside of the rotating shaft 34 passes through the proximity switch 9 during the rotation of the rotor 35 and the rotating shaft 34, the proximity switch 9 will record a value for the corresponding cell number. The dynamic pressure data detected by the air preheater heat transfer element blockage detection device 29 is synchronized, and the coordinates and distribution positions of the blocked areas are summarized.

[0067] In this embodiment, the air preheater heat transfer element blockage detection device 29 is arranged at the flue position of the air outlet of the hot end of the air preheater, and one full-pressure detection pipe 1 can move within a distance of two or more element packages, and two points can be detected in one element package area. The element package is placed in the cell 12; the proximity switch 9 is fixed, the metal sheet 36 is fixed with the rotating shaft 34, the air preheater rotor 35 and the rotating shaft rotate synchronously, and one metal sheet 36 corresponding to the position of the cell 12 of each rotor 35 in the air preheater. When the rotor 35 rotates, when one metal sheet 36 on the outside of the rotating shaft passes through the proximity switch 9, the proximity switch 9 records a value, and the proximity switch 9 records the cell number of the corresponding rotor 35. As shown in Figures 3 to 5 each fan-shaped area is also divided into small cells 12 from A to F, and A, B, and C are defined as inner side areas, and D, E, and F are defined as outer side areas. When the air preheater is running, the rotor 35 rotates continuously, and when the element blockage detection device starts to run, the proximity switch 9 also starts to continuously count. At a certain moment, when the air preheater heat transfer element blockage detection device detects that the B area of the cell 12 is blocked, the proximity switch sends the recorded cell number to the control module, and finally the coordinate information of the blocked area is formed in the control module, for example, (B, 10). After all the detection processes of the cells 12 are completed, the blockage detection device can summarize the dynamic pressure values of all the cells 12 of the air preheater heat transfer element and the corresponding coordinate values into the dynamic pressure data distribution of the entire rotor cell 12, to provide coordinates for subsequent execution of the soot blower 21.

[0068] When detecting, the furnace outer movable trolley 5 drives the furnace outer telescopic pipe 10, the electromagnetic valve box 4, the full pressure detection pipe 1 and the static pressure detection pipe 2 to move axially and detect the full pressure and static pressure of the corresponding position. The innermost detection pipe of the full pressure detection pipe 1 detects the A and B compartments, the middle detection pipe detects the C and D area, and the outermost detection pipe detects the E and F area. The opening and closing of the electromagnetic valve on the corresponding detection pipe is controlled by the electromagnetic valve box 4, and the dynamic pressure value of the detection position is obtained by the pressure transmitter in the electromagnetic valve box 4. When not detecting, the electromagnetic valve of the back blowing pipe 3 is opened to introduce compressed air for back blowing to prevent pipe blockage.

[0069] The visual monitoring module comprises a hot end camera 31, a cold end camera and thermal imaging device 32 and a monitor screen control box 33, the monitor screen control box 33 being connected with the hot end camera 31 and the cold end camera and thermal imaging device 32.

[0070] The hot end camera 31 is a camera for monitoring the operation of the heat transfer element and the sealing sheet in the hot end of the air preheater in real time, and has the function of measuring the gap to detect the radial sealing gap. The cold end camera and thermal imaging device 32 comprises a camera and an infrared thermal imager for monitoring the operation of the heat transfer element and the sealing sheet in the cold end of the air preheater in real time and measuring the surface temperature of the heat transfer element in the cold end, and has the function of fire over-temperature alarm.

[0071] The monitor screen control box 33 can conveniently realize on-site and remote video monitoring, and transmit the temperature data to the monitor screen control box 33 to judge whether the temperature is too high, which is used for DCS to judge whether to perform fire alarm.

[0072] The heat transfer element blockage detection module comprises an air preheater heat transfer element blockage detection device 29, a proximity switch 9 and a control module 30. The air preheater heat transfer element blockage detection device 29 detects the dynamic pressure value of each package of heat transfer element, and the proximity switch 9 synchronously records the current rotor compartment number. Finally, all test data are collected through the control module 30 to obtain a blockage distribution diagram of the entire rotor 35. The control module 30 is connected with the main control cabinet 23 to transmit the coordinates of the area needing treatment to the main control cabinet 23.

[0073] The steam blowing module mainly comprises two blowing devices 21 for cold and hot ends, a steam source supply device 22 and a main control cabinet 23. When the main control cabinet 23 receives the coordinate signal of the heat transfer element blockage detection module, the blowing device 21 at the corresponding position is started to directly reach the blockage area for steam blowing.

[0074] The high-pressure water blowing ash module mainly consists of a blowing ash device 21, a high-pressure water pump 26, a power supply device 28, a water supply device 27 and a main control cabinet 23. The high-pressure water is generated by the high-pressure water pump 26, and the flushing pressure can be as high as 35 MPa. When the main control cabinet 23 receives the coordinate signal of the heat transfer element blockage detection module, the blowing ash device 21 directly reaches the blockage area and uses the corresponding medium for blowing.

[0075] The air preheater intelligent blowing ash system does not need manual judgment and positioning, and is completely automatically detected and judged by the system, with high precision and sensitivity. The system automatically collects the blockage area distribution map using the signal output by the heat transfer element blockage detection module, and transmits the coordinates of the range to be blown to the main control cabinet 23 through the control module 30, and then controls the blowing ash device 21. According to the comparison of the preset data of the system, the blowing ash device 21 intelligently judges the blowing method to be used for processing.

[0076] The air preheater intelligent blowing ash system has full intelligent judgment and processing compared with the traditional large-scale comprehensive and timed blowing, and is suitable for blowing ash under various operating conditions, with high processing efficiency and fast time efficiency. When local blockage occurs in a certain part, it can be processed in time to avoid the accumulation and deterioration of the blockage. Since the inside and outside are divided into different areas for blowing, the amount of blowing medium is also reduced, and the energy consumption of the whole blowing ash system is reduced.

[0077] Finally, it should be noted that: the present application is not limited to the above-mentioned embodiments, any equivalent structure or equivalent process transformation using the contents of the present application specification and drawings, or direct or indirect application in other related technical fields, are also included in the protection scope of the present application patent.

Claims

1. An intelligent soot blowing system for an air preheater, characterized in that, It includes a heat transfer element blockage detection module and a soot blowing module. The heat transfer element blockage detection module is used to detect the specific location of blockage in the heat transfer element of the air preheater, and the soot blowing module is used to blow away and clean the blockage in the heat transfer element. The soot blowing module includes a soot blower (21), a purging medium supply device, and a main control cabinet (23). The soot blower (21) includes a soot blowing gun tube, an external telescopic tube (20), an external trolley (18), and a wall box (19). The wall box (19) and the external trolley (18) are located outside the air preheater housing (11). The external trolley (18) is fixed on the external telescopic tube (20). A first through hole is opened on the air preheater housing (11). One end of the external telescopic tube (20) is connected to the wall box (19), and the other end is inserted into the first through hole to enter the interior of the air preheater housing (11). The soot blowing gun tube passes through the first through hole on the air preheater housing (11), the external telescopic tube (20), and the purging medium interface on the wall box (19) in sequence and is connected to the purging medium supply device. A valve is provided on the soot blowing gun tube. The main control cabinet (23) controls the movement of the external trolley (18) and the opening and closing of the valve. The heat transfer element blockage detection module includes an air preheater heat transfer element blockage detection device (29), a proximity switch (9), and a control module (30); The air preheater heat transfer element blockage detection device (29) includes a total pressure detection tube (1), a static pressure detection tube (2), an external telescopic tube (10), an external trolley (5), and an electromagnetic valve box (4). The electromagnetic valve box (4) and the external trolley (5) are located outside the air preheater shell (11). The external trolley (5) is fixed on the external telescopic tube (10). A second through hole is opened on the air preheater shell (11). One end of the external telescopic tube (10) is connected to the electromagnetic valve box (4), and the other end is inserted into the second through hole to enter the interior of the air preheater shell (11). The total pressure detection tube (1) and the static pressure detection tube (2) pass through the second through hole on the air preheater shell (11) and the external telescopic tube (10) in sequence and are connected to the electromagnetic valve box (4). Electromagnetic valves are provided on both the total pressure detection tube (1) and the static pressure detection tube (2). A pressure transmitter is provided inside the electromagnetic valve box (4). The total pressure detection tube (1) and the static pressure detection tube (2) are connected to the pressure transmitter to obtain the dynamic pressure value at the detection position; The proximity switch (9) is located on the side of the shaft (34) of the air preheater rotor (35). The outer side of the shaft (34) is provided with metal plates (36) corresponding to the positions of the compartments (12) of each rotor (35) in the air preheater. The number of compartments (12) is the same as the number of metal plates (36). The control module (30) is connected to the air preheater heat transfer element blockage detection device (29) and the proximity switch (9).

2. The intelligent soot blowing system for air preheaters as described in claim 1, characterized in that, When the purging medium supplied by the purging medium supply device is steam, it is defined as a steam smog module, and the purging medium supply device is specifically a steam source supply device (22); when the purging medium supplied by the purging medium supply device is high-pressure water, it is defined as a high-pressure water smog module, and the high-pressure water is supplied by a high-pressure water pump (26).

3. The intelligent soot blowing system for air preheaters as described in claim 2, characterized in that, In the high-pressure water soot blowing module, the soot blower (21) is set at the cold end of the air preheater, and the high-pressure water pump (26) is connected to the power supply equipment (28), the water supply equipment (27) and the main control cabinet (23); there are two steam soot blowing modules, and the two soot blowers (21) are set at the cold end and the hot end of the air preheater respectively.

4. The intelligent soot blowing system for air preheaters as described in claim 1, characterized in that, One end of the full pressure detection tube (1) is a 90° bend.

5. The intelligent soot blowing system for air preheaters as described in claim 1, characterized in that, The air preheater heat transfer element blockage detection device (29) also includes a backflush pipe (3), which is connected to the total pressure detection pipe (1) and the static pressure detection pipe (2).

6. The intelligent soot blowing system for an air preheater as described in claim 1, characterized in that, It also includes a visualization monitoring module, which includes a hot-end camera device (31), a cold-end camera and thermal imaging device (32), and a monitoring screen control box (33), which is connected to the hot-end camera device (31) and the cold-end camera and thermal imaging device (32); The hot-end camera device (31) is used to monitor the operation of the heat transfer elements and sealing plates inside the hot end of the air preheater in real time online. The cold-end camera and thermal imaging device (32) is used to monitor the operation of the heat transfer elements and sealing plates inside the cold end of the air preheater in real time and measure the surface temperature of the heat transfer elements inside the cold end.

7. The intelligent soot blowing system for an air preheater as described in claim 1, characterized in that, The control module (30) is connected to the main control cabinet (23).

8. The intelligent soot blowing system for an air preheater as described in claim 6, characterized in that, The hot-end camera device (31) is a camera, and the cold-end camera and thermal imaging device (32) includes a camera and an infrared thermal imager.

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