On-line ash removal device for boiler flue air preheater

Abstract

The utility model relates to a boiler flue air preheater on-line deashing device which comprises a fixed protection sleeve, a movable protection sleeve is installed in the fixed protection sleeve, the upper contour of the movable protection sleeve is in an arc shape, the lower contour of the movable protection sleeve is in a square shape, an upper pipe cavity is formed in the upper portion of the movable protection sleeve, and a lower pipe cavity is formed in the lower portion of the movable protection sleeve. A lifting mechanism is mounted in the lower pipe cavity and comprises a telescopic rod, a blowing mechanism is mounted at the lower end of the telescopic rod, the blowing mechanism comprises a box body, a small gas storage tank is arranged in the box body and comprises a gas inlet pipe and a plurality of gas outlet pipes, valves are arranged on the gas outlet pipes, and a nozzle is arranged at the tail end of each gas outlet pipe; an outer sealing box is arranged below the rear end of the fixed protective sleeve; and the blowing mechanism is positioned in the outer sealing box in a shutdown or standby state. By the adoption of the technical scheme, the heat exchange tube of the air preheater can be rapidly cleaned and dredged under the condition that normal operation of the boiler is not affected, operation is easy, and the effect is ideal.

Description

Technical Field

[0001] The utility model relates to the field of boiler flue dredging equipment, in particular to an online dust cleaning device for a boiler flue air preheater. Background Art

[0002] After the flue gas of the factory boiler is discharged from the furnace, it still contains a large amount of usable heat. In order to save energy and protect the environment, it is necessary to recover as much heat as possible before discharging it from the chimney. Installing an air preheater on the flue is an indispensable part. At present, most boiler air preheaters are of tube-in-tube type, and the heat exchange tubes are generally staggered. The air preheater is installed in the boiler flue through the mounting frame. Since the flue gas contains a large amount of dust, which is mainly formed by molecular gravity and electrostatic action, the unit mass of the ash particles is very small. When the ash particles come into contact with the tube wall, the suction force between the molecules and the tube wall is greater than the gravity of the ash particles. The dust is very easy to deposit on the heat exchange pipe, resulting in loose dust accumulation on the inner wall of the heat exchange tube of the air preheater. At the same time, there are many other chemical substances in the flue gas. Under the high temperature of the flue gas, complex chemical reactions will also occur. The chemical substances produced will combine with the loose ash deposited on the inner wall of the tube to form a harder polymer, which will eventually seriously affect the heat transfer effect of the air preheater and cause low-temperature dew point corrosion. At the same time, the viscosity of the ash will increase, and the ash layer will continue to thicken, further reducing the air preheating temperature and expanding the dew point temperature range. At the same time, it will also expand the area of ​​​​sticky ash accumulation, accelerating the speed of ash accumulation and scaling; forming a vicious cycle, which will easily lead to the failure of the air preheater in the long run. This requires regular cleaning and maintenance of the heat exchange tubes of the air preheater, but due to the huge number of air preheater pipes, it takes a lot of manpower and time to clean the pipes, and the cleaning is extremely difficult or even impossible to clean. If a device can be provided that can quickly clean and unclog the ash accumulation in the heat exchange pipe without stopping the operation of the boiler, it can be achieved that the loose ash accumulation can be regularly and timely removed while the boiler is running to prevent it from forming hard polymers, thereby increasing the heat release coefficient and wall temperature on the flue gas side, preventing ash accumulation, reducing thermal resistance, and slowing down corrosion. This will save a lot of maintenance time, extend the service life of the air preheater, and extend the boiler operation cycle. Summary of the invention

[0003] The utility model aims to provide an online dust cleaning device for a boiler flue air preheater, which can quickly clean and dredge the heat exchange tubes of an air preheater in a boiler flue without stopping the operation of the boiler, and aims to solve the problem of great difficulty in cleaning the dust accumulation in the heat exchange tubes of an air preheater installed in the boiler flue.

[0004] The technical solution adopted by the utility model is: an online dust cleaning device for a boiler flue air preheater, comprising a fixed protective sleeve, the fixed protective sleeve is fixedly installed on the mounting frame of the air preheater, a guide rail is arranged in the fixed protective sleeve, a slot is arranged below the fixed protective sleeve, a movable protective sleeve is arranged in the fixed protective sleeve, the movable protective sleeve extends outward along the rear of the fixed protective sleeve, the upper contour of the movable protective sleeve is an arc shape, and the lower contour is a square shape, an upper tube cavity is arranged in the upper part of the movable protective sleeve, and a lower tube cavity is arranged in the lower part, the upper tube cavity is located in the fixed protective sleeve, and the lower tube cavity protrudes downward from the slot, a rolling wheel mechanism group is arranged at one end of the movable protective sleeve, and a transmission mechanism is arranged at the other end of the movable protective sleeve. The protective sleeve is driven to move on the fixed protective sleeve by a transmission mechanism; a lifting mechanism is installed in the lower tube cavity at the front of the movable protective sleeve, the lifting mechanism includes a telescopic rod, the telescopic rod extends below the lower tube cavity, and a blowing mechanism is installed at the lower end of the telescopic rod, and the blowing mechanism moves downward or upward with the extension and retraction of the telescopic rod, and the blowing mechanism includes a box body, a small gas storage tank is arranged in the box body, and the small gas storage tank includes an air inlet pipe and multiple air outlet pipes, each of the air outlet pipes is provided with a valve, and a nozzle is provided at the end of each of the air outlet pipes, and the arrangement of the nozzles is the same as that of the heat exchange tubes; an outer sealed box is arranged below the rear end of the fixed protective sleeve, and the front side of the outer sealed box is the box port, and the blowing mechanism is located in the outer sealed box when it is stopped or in standby state.

[0005] A further technical solution of the utility model is: the transmission mechanism includes a slide rail, a slider is provided on the slide rail, a connecting seat and a connecting sleeve are installed on the slider, a push rod is provided on the upper part of the connecting seat, the push rod passes through the connecting seat and the connecting sleeve, a mobile protective sleeve mounting seat is installed on the top of the connecting seat, the mobile protective sleeve mounting seat is fixedly connected to the end of the mobile protective sleeve, a rolling device is provided in the mobile protective sleeve mounting seat, the push rod is driven by a driving motor to drive the rolling device to make the mobile protective sleeve perform a telescopic action.

[0006] A further technical solution of the utility model is: it also includes an inner sealing door, the size of the inner sealing door is adapted to the size of the front side of the outer sealing box, a buckle is arranged above the top of the inner sealing door, a clamping ring is arranged on the top edge of the inner sealing door, a connecting rod shaft is arranged on the side close to the top of the inner sealing door, a lifting arm extending laterally is arranged on the rear part of the fixed protection sleeve, and a connecting mechanism is also arranged at the front part of the movable protection sleeve, the connecting mechanism includes a latch mechanism and a guide buckle, the latch mechanism is installed on the inner side of the front end of the movable protection sleeve, and the guide buckle is installed on the outer side of the front end of the movable protection sleeve, when the blowing mechanism is stopped or on standby, the buckle is buckled on the lifting arm, a lower guide card plate is arranged outside the bottom of the box opening, and an upper introduction seat is arranged outside the top of the box opening, when the inner sealing door is located at the box opening, the lower part of the inner sealing door is clamped in the lower guide card plate, and the clamping ring is buckled in the upper introduction seat, when the inner sealing door leaves the box opening, the connecting rod shaft is clamped in the guide buckle and locked by the latch mechanism, and the inner sealing door moves with the movable protection sleeve.

[0007] A further technical solution of the utility model is: an outer sealing door is arranged on the rear side of the outer sealing box, a push-pull mechanism is arranged on the rear side of the outer sealing door, the push-pull mechanism includes a body and a push-pull rod, the end of the push-pull rod is connected to the outer sealing door, the body is fixedly mounted on the mounting frame, and the push-pull mechanism drives the outer sealing door to move forward and backward in the outer sealing box.

[0008] A further technical solution of the utility model is: a lifting auxiliary pull rope mechanism is installed in the upper tube cavity at the front part of the movable protection sleeve, and the lifting auxiliary pull rope mechanism includes a pull rope, and the pull rope is connected to the telescopic rod of the lifting mechanism.

[0009] The beneficial effect of the utility model is that due to the adoption of the above technical scheme, the boiler flue air preheater online dust cleaning device of the utility model can quickly clean and dredge the heat exchange tubes of the air preheater without affecting the normal operation of the boiler, the operation is simple and the effect is ideal. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 It is a schematic diagram of the overall structure of the online dust cleaning device for the flue air preheater of the utility model;

[0011] Figure 2 It is a side structural schematic diagram of the novel online ash cleaning device for the flue air preheater of the boiler;

[0012] Figure 3 is a structural schematic diagram of the fixed protective sleeve;

[0013] Figure 4 is a structural schematic diagram of the transmission mechanism;

[0014] Figure 5is a schematic diagram of the longitudinal cross-sectional structure of the mobile protective sleeve;

[0015] Figure 6 is a schematic diagram of the cross-sectional structure of the rear portion of the mobile protective casing;

[0016] Figure 7 is a schematic structural diagram of the front portion of the mobile protective casing;

[0017] Figure 8 is a structural schematic diagram when the blowing mechanism is located in the outer sealing box;

[0018] Fig. 9 It is a structural schematic diagram when the blowing mechanism enters the preheater and the inner sealing door is located at the front end of the movable protective sleeve and is locked by the latch mechanism;

[0019] Fig.10 is an enlarged schematic diagram of the local structure when the inner sealing door is closed at the box opening;

[0020] Fig.11 It is a structural schematic diagram when the blowing mechanism enters the preheater and the outer sealing door is located at the box opening;

[0021] Fig.12 is a side structural schematic diagram of the blowing mechanism;

[0022] Fig.13 It is a schematic diagram of the top structure of the blowing mechanism. DETAILED DESCRIPTION

[0023] The utility model is further described below in conjunction with the accompanying drawings and specific implementation methods.

[0024] Example:

[0025] like Figures 1 to 13The boiler flue air preheater online dust cleaning device shown in the figure comprises a fixed protective sleeve 5, which is fixedly mounted on a mounting frame 10 of the air preheater, a guide rail 51 is arranged inside the fixed protective sleeve, a slot 52 is arranged below the fixed protective sleeve, a movable protective sleeve 3 is arranged inside the fixed protective sleeve, the movable protective sleeve extends outward along the rear of the fixed protective sleeve, the upper contour of the movable protective sleeve is an arc shape, and the lower contour is a square shape, an upper tube cavity 35 is arranged inside the upper part of the movable protective sleeve, and a lower tube cavity 34 is arranged inside the lower part, the upper tube cavity is located inside the fixed protective sleeve, and the lower tube cavity protrudes downward from the slot, a rolling wheel mechanism group 33 is arranged at one end of the movable protective sleeve, and a transmission mechanism 1 is arranged at the other end of the movable protective sleeve, and the movable protective sleeve is driven by the transmission mechanism 1 to move on the fixed protective sleeve 5 movement; a lifting mechanism 311 is installed in the lower tube cavity at the front of the mobile protective sleeve, and the lifting mechanism includes a telescopic rod, which extends below the lower tube cavity, and a blowing mechanism 8 is installed at the lower end of the telescopic rod. The blowing mechanism moves downward or upward with the extension and retraction of the telescopic rod, and the blowing mechanism 8 includes a box body, a hanging plate 83 is provided on the top surface of the box body, a mounting ring 84 is installed on the hanging plate, and a cable entry hole 85 is also provided on the hanging plate. A small gas storage tank 81 is provided in the box body, and the small gas storage tank includes an air inlet pipe and multiple air outlet pipes, and a valve 82 is provided on the air outlet pipe. A nozzle 86 is provided at the end of each of the air outlet pipes, and the arrangement of the nozzles is the same as that of the heat exchange tubes; an outer sealed box 4 is provided below the rear end of the fixed protective sleeve 5, and the front side of the outer sealed box is the box port, and the blowing mechanism is located in the outer sealed box when it is stopped or in standby state.

[0026] Furthermore, the transmission mechanism 1 includes a mounting bracket 2, a slide rail 12 is mounted on the mounting bracket 2, a slider 13 is provided on the slide rail, a connecting seat 15 and a connecting sleeve are installed on the slider, a push rod 14 is provided on the upper part of the connecting seat, the push rod passes through the connecting seat 15 and the connecting sleeve, a mobile protective sleeve mounting seat 17 is installed on the top of the connecting seat, the mobile protective sleeve mounting seat 17 is fixedly connected to the end of the mobile protective sleeve 3, a rolling device 16 is provided in the mobile protective sleeve mounting seat, and the push rod is driven by a driving motor to drive the rolling device to make the mobile protective sleeve perform telescopic action.

[0027] Furthermore, it also includes an inner sealed door 7, the size of the inner sealed door 7 is adapted to the size of the front side of the outer sealed box 4, a buckle ring 72 is arranged above the top of the inner sealed door, a clamping ring 71 is arranged on the top edge of the inner sealed door, a connecting rod shaft 74 is arranged on the side close to the top of the inner sealed door, a lifting arm 73 extending laterally is arranged on the rear of the fixed protective sleeve, and a connecting mechanism is also arranged at the front of the mobile protective sleeve, the connecting mechanism includes a latch mechanism 31 and a guide buckle 32, the latch mechanism 31 is installed on the inner side of the front end of the mobile protective sleeve 3, and the guide buckle 32 32 is installed on the outside of the front end of the movable protective sleeve 3. When the blowing mechanism is stopped or on standby, the buckle 72 is buckled on the lifting arm 73. A lower guide card plate 91 is provided outside the bottom of the box opening, and an upper introduction seat 42 is provided outside the top of the box opening. When the inner sealing door 7 is located at the box opening, its lower part is inserted into the lower guide card plate 91, and the buckle 71 is buckled into the upper introduction seat 42. When the inner sealing door leaves the box opening, the connecting rod shaft 74 is inserted into the guide buckle 32 and is locked by the latch mechanism 31. At this time, the inner sealing door can move with the movable protective sleeve.

[0028] Furthermore, an outer sealed door 41 is provided on the rear side of the outer sealed box 4, and a push-pull mechanism 43 is provided on the rear side of the outer sealed door. The push-pull mechanism includes a body and a push-pull rod, and the end of the push-pull rod is connected to the outer sealed door. The body is fixedly mounted on the mounting frame, and the push-pull mechanism drives the outer sealed door to move forward and backward in the outer sealed box.

[0029] Furthermore, a lifting auxiliary pull rope mechanism 36 is installed in the upper tube cavity at the front of the movable protection sleeve. The lifting auxiliary pull rope mechanism includes a pull rope, and the pull rope is connected to the telescopic rod of the lifting mechanism 311.

[0030] In the technical solution, the fixed protection sleeves and the movable protection sleeves can be provided in sets of two or more, wherein each set includes two fixed protection sleeves and two movable protection sleeves.

[0031] In this technical solution, it also includes a compressed air system, a hydraulic system, and an automatic control system, wherein:

[0032] Compressed gas system: mainly provides strong compressed gas for the injection mechanism, and also provides appropriate gas energy for related cylinders. The compressed gas of the injection system is connected from the rear end of the mobile protective sleeve through the air pipe, and then connected to the small gas storage tank in the injection mechanism through the hose.

[0033] Hydraulic system: It mainly provides hydraulic power for various lifting mechanisms and pushing and pulling mechanisms.

[0034] Automatic control system:

[0035] The system can automatically control the operation of each mechanism, coordinate and monitor the operating parameters of each mechanism, so that each mechanism can work closely together to complete the dust cleaning work of the preheater.

[0036] Automatic control process and principle:

[0037] When the device is on standby or stopped, the jet mechanism moves with the movable protective sleeve and stays in the outer sealed box. At this time, the inner sealed door serves to separate the preheater from the outer sealed box.

[0038] The inner sealing door 7 is in a closed sealing state. At this time, the inner sealing door 7 is lowered along with the lifting arm 73, and the buckle ring 72 on the top of the inner sealing door 7 is also lowered, and the lower end of the inner sealing door is inserted into the lower guide clamping plate 91. The buckle ring 71 on the upper side of the inner sealing door 7 also falls into the upper guide seat 42 as the inner sealing door 7 is lowered. At this time, the outer sealing door 41 is pulled to the near outer side by the stretching mechanism.

[0039] When the spray mechanism is ready to enter the preheater, the inner sealing door is lifted to a certain height by the lifting arm 73 through the ring plate 72, and is freed from the restrictions of the lower guide card plate 91 and the upper guide seat 42. At the same time, the latch mechanism 31 pushes out the latch to support the connecting rod shaft 74 of the inner sealing door so that the inner sealing door does not fall when it moves with the moving protective sleeve. In the process of the spray mechanism leaving the outer sealing box, the outer sealing door 41 is pulled to the inner side of the outer sealing box 4 by the push-pull mechanism 43 to prevent high-temperature smoke and dust from entering the outer sealing box.

[0040] Next, the blowing mechanism moves with the synchronous parallel operation of two or more movable protective sleeves, and stops after running to the designated area. Then the lifting mechanism 311 descends to drive the blowing mechanism down, and the nozzle below it is inserted into the preheating tube to clean the preheating tubes in the area one by one. After the cleaning is completed, the lifting mechanism 311 drives the blowing mechanism to rise. After it is in place, the blowing mechanism moves to the adjacent designated area with the movable protective sleeve. After it is in place, the lifting mechanism 311 descends to drive the blowing mechanism down, and the nozzle below it is inserted into the preheating tube to clean the preheating tubes in the area one by one. Repeat the above actions to clean all the preheating tubes.

[0041] This device can also clean the surface of the flower plate on the air preheater, but the nozzle is not inserted into the preheating pipe at this time.

[0042] After all the cleaning work is completed, the blowing mechanism must withdraw from the top of the air preheater, and before withdrawing to the door frame 6 of the inner sealing door 7 (in order to improve the airtightness of the inner sealing door, a door frame is installed on the box mouth of the outer sealing box), the push-pull mechanism 43 first pulls the outer sealing door to the outer side of the outer sealing box 4, and then the blowing mechanism withdraws into the outer sealing box, and its position is determined by the position of the inner sealing door 7. When the inner sealing door 7 reaches the appropriate position in front of the door frame, it stops, and then the lifting arm 73 of the inner sealing door 7 is lowered, and the lifting ring 72 on the inner sealing door is also lowered, and the bottom of the inner sealing door is inserted into the lower guide card plate 91, and the upper retaining ring 71 of the inner sealing door also falls into the upper guide seat 42 as the door panel descends. At this time, the inner sealing door 7 is in a closed and sealed state.

[0043] All the above operations and coordination are completed by the automatic control system, which can start the machine with one button and end it automatically.

[0044] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. An online dust cleaning device for a boiler flue air preheater, characterized in that: It comprises a fixed protection sleeve, which is fixedly installed on the mounting frame of the air preheater, a guide rail is arranged in the fixed protection sleeve, a slot is arranged below the fixed protection sleeve, a movable protection sleeve is arranged in the fixed protection sleeve, the movable protection sleeve extends outward along the rear of the fixed protection sleeve, the upper contour of the movable protection sleeve is arc-shaped, and the lower contour is square, an upper tube cavity is arranged in the upper part of the movable protection sleeve, and a lower tube cavity is arranged in the lower part, the upper tube cavity is located in the fixed protection sleeve, and the lower tube cavity protrudes downward from the slot, a rolling wheel mechanism group is arranged at one end of the movable protection sleeve, and a transmission mechanism is arranged at the other end, and the movable protection sleeve is driven by the transmission mechanism to move in the fixed protection sleeve. The movable protective sleeve moves on the sleeve; a lifting mechanism is installed in the lower tube cavity at the front of the movable protective sleeve, the lifting mechanism includes a telescopic rod, the telescopic rod extends to the bottom of the lower tube cavity, and a blowing mechanism is installed at the lower end of the telescopic rod, and the blowing mechanism moves downward or upward with the extension and retraction of the telescopic rod, and the blowing mechanism includes a box body, a small gas storage tank is arranged in the box body, and the small gas storage tank includes an air inlet pipe and multiple air outlet pipes, each of the air outlet pipes is provided with a valve, and a nozzle is provided at the end of each of the air outlet pipes, and the arrangement of the nozzles is the same as that of the heat exchange tubes; an outer sealed box is arranged below the rear end of the fixed protective sleeve, and the front side of the outer sealed box is the box port, and the blowing mechanism is located in the outer sealed box when it is stopped or in standby state.

2. The boiler flue air preheater online dust cleaning device according to claim 1 is characterized in that: The transmission mechanism includes a slide rail, a slider is provided on the slide rail, a connecting seat and a connecting sleeve are installed on the slider, a push rod is provided on the upper part of the connecting seat, the push rod passes through the connecting seat and the connecting sleeve, a movable protective sleeve mounting seat is installed on the top of the connecting seat, the movable protective sleeve mounting seat is fixedly connected to the end of the movable protective sleeve, a rolling device is provided in the movable protective sleeve mounting seat, the push rod is driven by a driving motor, and drives the rolling device to make the movable protective sleeve move forward and backward.

3. The boiler flue air preheater online dust cleaning device according to claim 1 is characterized in that: The cam is provided with a clasp on the top of the inner sealing door, and a clamping ring is provided on the top edge of the inner sealing door. A connecting rod shaft is provided on the side close to the top of the inner sealing door. A lifting arm extending laterally is provided on the rear part of the fixed protective sleeve. A connecting mechanism is also provided on the front part of the movable protective sleeve. The connecting mechanism includes a latch mechanism and a guide buckle. The latch mechanism is installed on the inner side of the front end of the movable protective sleeve, and the guide buckle is installed on the outer side of the front end of the movable protective sleeve. When the blowing mechanism is stopped or on standby, the buckle is buckled on the lifting arm. A lower guide card plate is provided outside the bottom of the box opening, and an upper introduction seat is provided outside the top of the box opening. When the inner sealing door is located at the box opening, the lower part of the inner sealing door is inserted into the lower guide card plate, and the clamping ring is buckled into the upper introduction seat. When the inner sealing door leaves the box opening, the connecting rod shaft is inserted into the guide buckle and locked by the latch mechanism, and the inner sealing door moves with the movable protective sleeve.

4. The boiler flue air preheater online dust cleaning device according to claim 1, characterized in that: An outer sealed door is arranged on the rear side of the outer sealed box, and a push-pull mechanism is arranged on the rear side of the outer sealed door. The push-pull mechanism includes a body and a push-pull rod, and the end of the push-pull rod is connected to the outer sealed door. The body is fixedly mounted on the mounting frame, and the push-pull mechanism drives the outer sealed door to move forward and backward in the outer sealed box.

5. The boiler flue air preheater online dust cleaning device according to claim 1 is characterized in that: A lifting auxiliary pull rope mechanism is installed in the upper tube cavity at the front of the movable protective sleeve. The lifting auxiliary pull rope mechanism includes a pull rope, and the pull rope is connected to the telescopic rod of the lifting mechanism.

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