CN108253438B - Alkali recovery boiler ash removal system and alkali recovery boiler ash removal method - Google Patents
Alkali recovery boiler ash removal system and alkali recovery boiler ash removal method Download PDFInfo
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- CN108253438B CN108253438B CN201810213305.9A CN201810213305A CN108253438B CN 108253438 B CN108253438 B CN 108253438B CN 201810213305 A CN201810213305 A CN 201810213305A CN 108253438 B CN108253438 B CN 108253438B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES
- F23J1/00—Removing ash, clinker, or slag from combustion chambers
- F23J1/06—Mechanically-operated devices, e.g. clinker pushers
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES
- F23J3/00—Removing solid residues from passages or chambers beyond the fire, e.g. from flues by soot blowers
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Abstract
An alkali recovery boiler ash removal system and an alkali recovery boiler ash removal method comprise a shielding screen, a movable perforating device and a drill rod hammer; the ash removal process comprises the following steps: the shielding screen is delivered into an alkali recovery boiler from a manhole (24) and is connected with a boiler pipeline (1) at the outlet of a hearth; the tapping device is delivered into an alkali recovery boiler from a manhole (24), the tapping device is well connected with an external hydraulic oil pipe and a coolant pipe, the tapping device is operated, and a plurality of blind holes are cut on the surface of an ash accumulation layer; a drill rod hammer is delivered into an alkali recovery boiler from a manhole (24), a push rod, a cylinder or a hydraulic cylinder (16) of the drill rod hammer is connected with an externally input power source pipeline, the drill rod hammer is operated, a part of a steel drill (18) is driven into an ash deposition layer, the steel drill (18) is pried to cause ash deposition to fall off, and fallen ash deposition blocks are removed from the manhole (24) or crushed and then fall into an ash bucket through an alkali recovery boiler tube bundle.
Description
Technical Field
The application relates to the technical field of pulping and papermaking chemical recovery, in particular to an ash removal system for ash removal of an alkali recovery boiler, and also relates to an ash removal method of the alkali recovery boiler.
Background
In the pulping process, black liquor is burned in an alkali recovery boiler. The tasks of the alkali recovery boiler include recovery of chemicals and recovery of heat energy generated in the combustion process.
The alkali recovery boiler comprises a furnace fed with black liquor and air required for combustion. The alkali recovery boiler is an important device of modern pulping enterprises, has large investment and plays an important role in continuous operation of pulping. With the development of technology, the current large-scale alkali recovery boiler can meet the requirements of continuous operation of a pulping production line in the aspects of alkali recovery rate, thermal efficiency, operation period and the like.
However, for the first generation of full water-cooled wall alkali recovery boilers in China, such as ZHP4 type alkali recovery boilers, which are still running, the design height of a hearth is low due to the consideration of engineering cost, the temperature of the flue gas at the outlet of the hearth is higher, and the fused fly ash at a Fei Si ton pipe is extremely easy to form hard blocks, so that when ash is accumulated to a certain extent, the normal circulation of the flue gas is blocked, the production capacity of the alkali recovery boiler is reduced, the normal production of the system cannot be maintained, and the ash is removed by stopping the furnace. In the ash removal process, the furnace is stopped for a period of time to cool the hearth, then the manhole door is opened, fly ash caking around the manhole door is cleaned firstly by adopting an artificial mode, people enter the alkali recovery boiler from the manhole door to remove ash, an induced draft fan is started in the ash removal process, two people enter the furnace in turn in general during ash removal, and tools such as steel drills, hammers and the like are used for operation, and the ash removal process is finished manually. Because the ash removal position is positioned at the partition wall between the hearth outlet at the top of the alkali recovery boiler and the heat exchange tube bundle, the problems of high temperature, large dust, high potential safety hazard and high labor intensity exist, and personnel can only operate in the furnace for a short time, so that the ash removal time is long. The ash removal becomes a high-risk operation with great influence on the health of operators and great safety risk, and each time of furnace shutdown ash removal, the production is influenced for 2-3 days. Therefore, how to improve the operation efficiency, shorten the ash removal time of the blowing-in furnace, solve the potential safety hazard of ash removal of the alkali recovery boiler and reduce the labor intensity is a difficult problem which needs to be solved urgently.
Disclosure of Invention
The application aims to solve the technical problem of providing an alkali recovery boiler ash removal system and an alkali recovery boiler ash removal method which can improve the ash removal environment of an alkali recovery boiler, improve ash removal efficiency and reduce ash removal labor intensity.
In order to solve the technical problems, according to one aspect of the present application, there is provided an alkali recovery boiler ash removal system, comprising a shielding screen detachably connected to a furnace outlet boiler pipe, a movable tapping device, and a movable drill rod hammer; the shielding screen comprises a screen body which can be rolled up, and a plurality of ropes which are respectively connected with one end of the screen body; the tapping device comprises a hydraulic motor, an operating mechanism connected with the hydraulic motor, a rotating shaft in transmission connection with the hydraulic motor, and a cutting tool in detachable connection with the end, far away from the hydraulic motor, of the rotating shaft; the drill rod hammer comprises a frame, a vertical rod, an impact hammer, a unhooking mechanism, a touch rod, a first pulley, a push rod, a cylinder or a hydraulic cylinder, wherein the first end of the vertical rod is connected with the frame, the impact hammer is connected with the vertical rod in a sliding manner, the unhooking mechanism is detachably connected with the impact hammer and is connected with the vertical rod in a sliding manner, the touch rod is connected with the vertical rod and is used for triggering the unhooking mechanism to unhook, the first pulley is connected with the other end of the vertical rod, the push rod, the cylinder or the hydraulic cylinder is connected with the frame, the first end of the push rod, the cylinder or the hydraulic cylinder is connected with the frame, the other end of the push rod, the cylinder or the hydraulic cylinder spans the first pulley and then is connected with the unhooking mechanism, and the operating rod is positioned below the impact hammer and is connected with the frame through a steel drill rod in a sliding manner; the rotary shaft is provided with an axial through hole, a rotary joint connected with the end, far away from the cutting tool, of the axial through hole, a cooling liquid inlet pipe and a cooling liquid outlet pipe connected with the rotary joint, the cutting tool is provided with a cooling cavity communicated with the axial through hole, one end of the cooling liquid inlet pipe stretches into the cooling cavity, and the cooling liquid outlet pipe is communicated with the end, far away from the cutting tool, of the axial through hole.
As an improved technical scheme of the application, the ash removal system of the alkali recovery boiler is characterized in that the other end of the screen body is also provided with a rope connected with the screen body.
As an improvement technical scheme of the application, the ash removing system of the alkali recovery boiler provided by the application is characterized in that the shielding screen is also provided with a magnetic material body embedded in the screen body.
As an improved technical scheme of the application, the ash removal system of the alkali recovery boiler is characterized in that an umbrella-shaped inserting rod used for being connected with an unhooking mechanism is arranged at the top of the impact hammer; the unhooking mechanism is provided with a bracket; a first hook and a second hook, one end of which is hinged with the bracket; a tension spring with two ends respectively connected with the first hook and the second hook; the second pulley and the third pulley are respectively connected with the two ends of the bracket; the middle part of the compression bar is hinged with the bracket; the first end is connected with one end of the compression bar, and the other end of the compression bar spans over a second pulley and then is connected with the second steel wire rope of the first hook; the first end is connected with one end of the compression bar, and the other end sequentially spans over the second pulley and the third pulley and then is connected with the third steel wire rope of the second hook; the bottom surfaces of the first hook and the second hook are respectively provided with an inclined surface which can slide along the top surface of the umbrella-shaped inserting connection rod; the second pulley is provided with at least two grooves, and the second steel wire rope and the third steel wire rope are respectively wound in different grooves.
As an improvement technical scheme of the application, the ash removal system of the alkali recovery boiler is further provided with a limiting block connected with the bracket, and the limiting block limits the lowest descending position of the connecting end of the compression bar and the second steel wire rope and the third steel wire rope.
According to the ash removal system for the alkali recovery boiler, a sliding rod is arranged on one side of the upright rod, which is close to the impact hammer, in the axial direction, and the impact hammer and the unhooking mechanism are respectively provided with a sliding sleeve in sliding connection with the sliding rod.
According to another aspect of the application, the application provides a method for cleaning an alkali recovery boiler, wherein a shielding screen, a movable perforating device and a movable drill rod hammer are used in the cleaning process; the shielding screen comprises a screen body which can be rolled up, and a plurality of ropes which are respectively connected with one end of the screen body; the tapping device comprises a hydraulic motor, an operating mechanism connected with the hydraulic motor, a rotating shaft in transmission connection with the hydraulic motor, and a cutting tool in detachable connection with the end, far away from the hydraulic motor, of the rotating shaft; the drill rod hammer comprises a frame, a vertical rod, an impact hammer, a unhooking mechanism, a touch rod, a first pulley, a push rod, a cylinder or a hydraulic cylinder, wherein the first end of the vertical rod is connected with the frame, the impact hammer is connected with the vertical rod in a sliding manner, the unhooking mechanism is detachably connected with the impact hammer and is connected with the vertical rod in a sliding manner, the touch rod is connected with the vertical rod and is used for triggering the unhooking mechanism to unhook, the first pulley is connected with the other end of the vertical rod, the push rod, the cylinder or the hydraulic cylinder is connected with the frame, the first end of the push rod, the cylinder or the hydraulic cylinder is connected with the frame, the other end of the push rod, the cylinder or the hydraulic cylinder spans the first pulley and then is connected with the unhooking mechanism, and the operating rod is positioned below the impact hammer and is connected with the frame through a steel drill rod in a sliding manner; the rotary shaft is provided with an axial through hole, a rotary joint connected with the end, far away from the cutting tool, of the axial through hole, a cooling liquid inlet pipe and a cooling liquid outlet pipe connected with the rotary joint, the cutting tool is provided with a cooling cavity communicated with the axial through hole, one end of the cooling liquid inlet pipe stretches into the cooling cavity, and the cooling liquid outlet pipe is communicated with the end, far away from the cutting tool, of the axial through hole; the ash removal process comprises the following steps: opening a manhole of an alkali recovery boiler, removing part of accumulated ash around the manhole and in the boiler, enabling personnel to enter the alkali recovery boiler, transferring the rolled shielding screen into the alkali recovery boiler from the manhole, binding a rope connected with one end of the screen body on a boiler pipeline at a hearth outlet, and enabling the other end of the screen body to reach the surface of an accumulated ash layer after the screen body is unfolded; manually removing accumulated ash attached to the top of a hearth outlet of an alkali recovery boiler and the side wall and the surface of an accumulated ash layer, after easily falling off, transferring the perforating device into the alkali recovery boiler from a manhole, pulling an external hydraulic oil pipe and a cooling liquid pipe into the alkali recovery boiler through the manhole or an operation hole of the alkali recovery boiler, connecting a hydraulic motor of the perforating device with the external hydraulic oil pipe, connecting a cooling liquid inlet pipe and a cooling liquid outlet pipe of the perforating device with the external cooling liquid pipe, moving a cutting tool of the perforating device to the surface of the accumulated ash layer, operating the perforating device, cutting a plurality of blind holes on the surface of the accumulated ash layer, and intersecting or approaching adjacent blind holes; the method comprises the steps of (1) transferring a drill rod hammer into an alkali recovery boiler from a manhole, pulling an external power source pipeline into the alkali recovery boiler through the manhole or an operation hole of the alkali recovery boiler, connecting a push rod, a cylinder or a hydraulic cylinder of the drill rod hammer with the power source pipeline input from the outside, moving a steel drill of the drill rod hammer to the side of a blind hole cut by a perforating device, operating the drill rod hammer, driving a part of the steel drill into an ash accumulation layer, and prying the steel drill by a second operating rod by hand to enable accumulated ash to fall off, wherein the fallen accumulated ash blocks are moved out of the furnace from the manhole or fall into an ash bucket through the tube bundle of the alkali recovery boiler after being broken; and (3) repeatedly using the perforating device to perforate after cleaning the deposited ash, hammering steel bars by using a drill rod, and prying the steel bars until the deposited ash is cleaned.
As an improvement technical scheme of the application, the ash removal method of the alkali recovery boiler is characterized in that the other end of the screen body is also provided with a rope connected with the screen body, and the other end of the screen body is bound on a boiler pipeline at the outlet of a hearth through the rope connected with the screen body.
The improvements may be implemented alone or in combination.
In the prior art, part of dust is fallen into the bottom of the hearth due to dust accumulation in the ash removal process at the top of the hearth, personnel need to enter the bottom of the hearth and drag out from the chute of the alkali recovery boiler, otherwise, the normal starting-up of the alkali recovery boiler is affected, the ash removal time is prolonged, and the labor intensity is increased. The ash deposition property of the alkali recovery boiler is influenced by factors such as combustion working conditions, running time, ash deposition positions and the like, the ash deposition properties of different running working conditions and ash deposition positions are greatly different, and the ash deposition property is hard to be like rock, and when a common air cannon machine is used for operation, although a drill rod of the air cannon machine can rapidly enter the ash deposition layer, due to the performance and the operation principle of the air cannon machine, only a hole equivalent to the diameter of the drill rod can be drilled, and a large amount of ash deposition cannot be pried when the air cannon machine is pried, so that the working efficiency is extremely low. The steel drill is manually driven into the ash deposition layer by the heavy hammer, so that the ash deposition layer can be cracked and fallen off in large blocks. According to the technical scheme provided by the application, the shielding screen is arranged on the boiler pipeline at the outlet of the hearth, so that deposited ash can be prevented from falling into the hearth in the ash removal process, and the deposited ash at the bottom of the hearth can be cleaned without entering the hearth; the shielding screen can also prevent hot gas and dust at the outlet of the hearth from entering a personnel operation area, so that the operation environment is improved; the safety of the operation is improved. The blind holes are cut layer by using the perforating device, so that deposited ash on the periphery of the blind holes is easy to pry and fall off, and then deposited ash on the places nearby the pryed deposited ash is also easy to pry and fall off. The drill rod hammer simulates a manual operation method, and the hammer is used for beating the drill rod, so that the technical effect similar to that of manual ash removal can be obtained, and the accumulated ash layer is cracked and falls off in a large scale, thereby improving the operation efficiency and reducing the labor intensity.
Drawings
The accompanying drawings are included to provide a further understanding of the application, and are incorporated in and constitute a part of this specification, illustrate embodiments of the application and together with the description serve to explain the application. In the drawings:
FIG. 1 is a schematic diagram of an embodiment of an ash deposition state of an alkali recovery boiler;
FIG. 2 is a schematic view of the construction principle and installation position of a shielding screen of an ash removal system of an alkali recovery boiler according to an embodiment;
FIG. 3 is a schematic diagram of the structure principle of the opening device of the ash removal system of the alkali recovery boiler;
FIG. 4 is a schematic diagram of a cooling mechanism of an opening device of an ash removal system of an alkali recovery boiler according to an embodiment;
FIG. 5 is a schematic diagram of the structural principle of a drill rod hammer of the ash removal system of the alkali recovery boiler according to the embodiment;
fig. 6 is a schematic structural diagram of an impact hammer and unhooking mechanism of the ash removal system of the alkali recovery boiler in an embodiment.
Detailed Description
The application is further described below with reference to the accompanying drawings.
The alkali recovery boiler ash removal system as shown in fig. 2 to 6 comprises a shielding screen for detachable connection with the furnace outlet boiler duct 1, a movable tapping device, and a movable drill rod hammer. The shielding screen as shown in fig. 1 and 2 comprises a screen body 2 which can be rolled up, and a rope 3 connected with one end of the screen body 2; as shown in fig. 3 and 4, the tapping device comprises a hydraulic motor 4, an operating mechanism 5 connected with the hydraulic motor 4, a rotating shaft 6 in transmission connection with the hydraulic motor 4, and a cutting tool 7 detachably connected with the end, far away from the hydraulic motor 4, of the rotating shaft 6; the rotary shaft 6 is provided with an axial through hole 8, a rotary joint 9 connected with the end, far away from the cutting tool 7, of the axial through hole 8, a cooling liquid inlet pipe 22 and a cooling liquid outlet pipe 23 connected with the rotary joint 9, the cutting tool 7 is provided with a cooling cavity 21 communicated with the axial through hole 8, one end of the cooling liquid inlet pipe 22 stretches into the cooling cavity 21, and the cooling liquid outlet pipe 23 is communicated with the end, far away from the cutting tool 7, of the axial through hole 8; as shown in fig. 5, the drill rod hammer includes a frame 10, a vertical rod 11 having a first end connected to the frame 10, an impact hammer 12 slidably connected to the vertical rod 11, a unhooking mechanism 13 detachably connected to the impact hammer 12 and slidably connected to the vertical rod 11, a touch rod 14 connected to the vertical rod 11 for triggering unhooking of the unhooking mechanism 13, a first pulley 15 connected to the other end of the vertical rod 11, a push rod, cylinder or hydraulic cylinder 16 connected to the frame 10, a first wire rope 17 having a first end connected to the push rod, cylinder or hydraulic cylinder 16 and the other end connected to the unhooking mechanism 13 after crossing the first pulley 15, a drill rod 18 located below the impact hammer 12 and connected to the frame 10 through a sliding sleeve, and an operation rod 19 connected to the frame 10.
In one embodiment, the impact hammer 12 and the unhooking mechanism 13 are connected with the upright rod 11 through sliding sleeve matching, wherein one scheme is that a sliding rod is arranged on one side of the upright rod 11 near the impact hammer 12 along the axial direction, and the impact hammer 12 and the unhooking mechanism 13 are respectively provided with a sliding sleeve in sliding connection with the sliding rod. The operating mechanism 5 of the tapping device is provided with a control switch for controlling the operation of the cutting tool 7 and a control switch for controlling the inlet and outlet of cooling liquid, and the operating rod 19 is provided with a control switch for controlling the push rod, the cylinder or the hydraulic cylinder 16. When the unhooking mechanism 13 descends and hits the impact hammer 12, the unhooking mechanism 13 is connected with the impact hammer 12 into a whole, when the push rod, the cylinder or the hydraulic cylinder 16 contracts, the unhooking mechanism 13 drives the impact hammer 12 to ascend, and when the unhooking mechanism 13 hits the touch rod 14, the unhooking mechanism 13 is separated from the impact hammer 12, and the separated impact hammer 12 descends under the action of gravity to strike the steel drills 18. The impact hammer 12, the unhooking mechanism 13 and the vertical rod 11 are connected in a sliding sleeve fit manner through a sliding rod, so that the drill rod hammer can be used when being in an inclined state, and the flexibility and the safety in use are improved.
When the alkali recovery boiler is used for ash removal, the boiler is shut down for a period of time, after the boiler is cooled until personnel can enter, the manhole 24 of the alkali recovery boiler is opened, after the periphery of the manhole 24 and part of accumulated ash in the boiler are removed, the personnel enter the alkali recovery boiler, the rolled shielding screen is delivered into the alkali recovery boiler from the manhole 24, a rope 3 connected with one end of the screen body 2 is bound to a boiler pipeline 1 at a hearth outlet, and after the screen body 2 is unfolded, the other end of the screen body reaches the surface of an ash accumulation layer; manually removing accumulated ash attached to the top of a hearth outlet of an alkali recovery boiler and the side wall and the surface of an accumulated ash layer, after easily falling off, transferring an opening device into the alkali recovery boiler from a manhole 24, pulling an external hydraulic oil pipe and a cooling liquid pipe into the alkali recovery boiler through the manhole 24 or an operation hole of the alkali recovery boiler, connecting a hydraulic motor 4 of the opening device with the external hydraulic oil pipe, connecting a cooling liquid inlet pipe (22) and a cooling liquid outlet pipe (23) of the opening device with the external cooling liquid pipe, moving a cutting tool (7) of the opening device to the surface of the accumulated ash layer, operating the opening device, cutting a plurality of blind holes on the surface of the accumulated ash layer, and intersecting or approaching each other adjacent blind holes; the method comprises the steps of (1) transferring a drill rod hammer into an alkali recovery boiler from a manhole 24, pulling an external power source pipeline into the alkali recovery boiler through the manhole 24 or an alkali recovery boiler operation hole, connecting a push rod, a cylinder or a hydraulic cylinder 16 of the drill rod hammer with the power source pipeline input from the outside, moving a steel drill 18 of the drill rod hammer to the side of a blind hole cut by a perforating device, operating the drill rod hammer, driving a part of the steel drill 18 into an ash deposition layer, and prying the steel drill 18 by a hand operating rod 19 to enable ash deposition to fall off, wherein the fallen ash deposition block is moved out of the furnace from the manhole 24 or falls into an ash bucket through an alkali recovery boiler tube bundle after being broken; and (3) repeatedly using the perforating device to perforate after cleaning the deposited ash, hammering steel bars by using a drill rod, and prying the steel bars until the deposited ash is cleaned.
In the prior art, when the deposited ash at the outlet of the hearth is removed, part of deposited ash falls into the bottom of the hearth, personnel need to enter the bottom of the hearth and drag out from the chute of the alkali recovery boiler, otherwise, the normal starting-up of the alkali recovery boiler is affected, the ash removal time is prolonged, and the labor intensity is increased. The shielding screen is arranged on the boiler pipeline 1 at the outlet of the hearth, and can prevent deposited ash from falling into the hearth in the ash removal process, so that the deposited ash falling into the bottom of the hearth does not need to be cleaned in the furnace; the shielding screen can also prevent hot gas and dust at the outlet of the hearth from directly entering a personnel operation area, so that the operation environment is improved; the safety of the operation is improved. The blind holes are cut layer by using the perforating device, so that deposited ash on the periphery of the blind holes is easy to pry and fall off, and then deposited ash on the places nearby the pryed deposited ash is also easy to pry and fall off. The ash deposition characteristics of the alkali recovery boiler are influenced by factors such as combustion working conditions, running time, ash deposition positions and the like, different running working conditions and ash deposition properties at different positions are greatly different, and are hard like rock, and if sand flows, when the ordinary air cannon machine is used for operation, although a drill rod of the air cannon machine can rapidly enter the ash deposition layer under most conditions, due to the performance and working principle of the air cannon machine, only one hole can be drilled, when the air cannon machine is pried, the surrounding of the hole is loose, a large amount of ash deposition cannot be pried, and the working efficiency is extremely low. The steel drill is manually driven into the dust deposit layer by the heavy hammer, and the dust deposit layer can be cracked and fallen off in a large block by the impact mode. The drill rod hammer simulates a manual operation method, and the drill rod 18 is hit by using the heavy hammer, so that the technical effect similar to that of manual ash removal can be obtained, the operation efficiency is higher, and the labor intensity is reduced.
The temperature inside the ash accumulation layer is still higher in a period of time of furnace shutdown, and sometimes the temperature inside the ash accumulation layer is up to hundreds of degrees (the inner ash accumulation layer reddening, and spontaneous radiation reaches the longest wave band in visible light), and when the tapping device is used for tapping, the rotating shaft 6 and the cutting tool 7 are cooled by cooling liquid, so that the performance of the cutting tool 7 is maintained, and the excessive rapid abrasion at high temperature is prevented.
Further, the ash removing system of the alkali recovery boiler provided by the application has the advantages that the other end of the screen body 2 is also provided with the rope connected with the screen body 2.
Further, as shown in fig. 2, the ash removing system of the alkali recovery boiler provided by the application is further provided with a magnetic material body 20 embedded in the screen body 2. The magnetic material body 20 is adsorbed on the boiler pipe 1 at the outlet of the hearth, and further fixes the screen body 2.
Further, in the ash removal system of the alkali recovery boiler provided by the application, as shown in fig. 6, an umbrella-shaped inserting rod 201 for connecting with the unhooking mechanism 13 is arranged at the top of the impact hammer 12; the unhooking mechanism 13 is provided with a bracket 202, a first hook 203 and a second hook 204 with one end hinged with the bracket 202, a tension spring 205 with two ends respectively connected with the first hook 203 and the second hook 204, a second pulley 206 and a third pulley 207 respectively connected with two ends of the bracket 202, a pressing rod 208 with the middle hinged with the bracket 202, a second steel wire rope 209 with one end connected with one end of the pressing rod 208 and the other end connected with the first hook 203 after crossing the second pulley 206, a third steel wire rope 210 with the other end connected with the second hook 204 after crossing the second pulley 206 and the third pulley 207 in sequence, and inclined surfaces capable of sliding along the top surface of the umbrella-shaped inserting connection rod 201 are arranged on the bottom surfaces of the first hook 203 and the second hook 204; wherein the second pulley 206 has at least two grooves, and the second wire rope 209 and the third wire rope 210 are wound around the second pulley 206 in different grooves, respectively. The contact portions of the first hooks 203 and the second hooks 204 with the umbrella-shaped insertion connection rod 201 are designed into an arc shape.
The top of umbrella-shaped inserting and connecting rod 201 is conical, when unhooking mechanism 13 descends, first hook 203 and second hook 204 touch umbrella-shaped inserting and connecting rod 201, the inclined planes at the bottoms of first hook 203 and second hook 204 contact the conical surface of umbrella-shaped inserting and connecting rod 201, under the action of gravity impact, the conical part of umbrella-shaped inserting and connecting rod 201 separates first hook 203 and second hook 204 to two sides, after first hook 203 and second hook 204 cross the conical part of umbrella-shaped inserting and connecting rod 201, under the action of tension spring 205, first hook 203 and second hook 204 are clamped into the neck part of umbrella-shaped inserting and connecting rod 201, and impact hammer 12 and unhooking mechanism 13 are connected into a whole. When the push rod, the cylinder or the hydraulic cylinder 16 drives the combined body of the impact hammer 12 and the unhooking mechanism 13 to ascend together, after the compression rod 208 of the unhooking mechanism 13 is far away from the steel wire rope connecting end and touches the touch rod 14, the compression rod 208 is far away from the steel wire rope connecting end and descends, and the steel wire rope connecting end ascends, the steel wire rope drives the first hook 203 and the second hook 204 to separate towards two sides against the tension of the tension spring 205, and when the gap between the first hook 203 and the second hook 204 is larger than the diameter of the umbrella-shaped inserting connection rod 201, the impact hammer 12 is separated from the unhooking mechanism 13 and the steel drill 18 is hit under the action of gravity.
Further, as shown in fig. 6, the unhooking mechanism 13 of the alkali recovery boiler ash removal system provided by the application is further provided with a limiting block 211 connected with the bracket 202, and the limiting block 211 limits the lowest descending position of the connecting ends of the compression bar 208 and the second steel wire rope 209 and the third steel wire rope 210. The second wire rope 209 and the third wire rope 210 are always in a tensioned state.
Various modifications and variations of the present application will be apparent to those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the claims of the present application should be included in the protection scope of the present application.
Claims (6)
1. An alkali recovery boiler ash removal system is characterized by comprising a shielding screen, a movable perforating device and a movable drill rod hammer, wherein the shielding screen is used for being detachably connected with a boiler pipeline (1) at a hearth outlet; the shielding screen comprises a screen body (2) which can be rolled up, and a plurality of ropes (3) which are respectively connected with one end of the screen body (2); the perforating device comprises a hydraulic motor (4), an operating mechanism (5) connected with the hydraulic motor (4), a rotating shaft (6) in transmission connection with the hydraulic motor (4), and a cutting tool (7) detachably connected with the end, far away from the hydraulic motor (4), of the rotating shaft (6); the drill rod hammer comprises a frame (10), a vertical rod (11) with a first end connected with the frame (10), an impact hammer (12) connected with the vertical rod (11) in a sliding manner, a unhooking mechanism (13) connected with the impact hammer (12) in a detachable manner and connected with the vertical rod (11) in a sliding manner, a touch rod (14) connected with the vertical rod (11) and used for triggering the unhooking mechanism (13) to unhook, a first pulley (15) connected with the other end of the vertical rod (11), a push rod, a cylinder or a hydraulic cylinder (16) connected with the frame (10), a first steel wire rope (17) with the unhooking mechanism (13) after the other end crosses the first pulley (15), a steel drill rod (18) connected with the frame (10) through a sliding sleeve, and an operating rod (19) connected with the frame (10); the rotary shaft (6) is provided with an axial through hole (8), a rotary joint (9) connected with the end, far away from the cutting tool (7), of the axial through hole (8), a cooling liquid inlet pipe (22) and a cooling liquid outlet pipe (23) connected with the rotary joint (9), the cutting tool (7) is provided with a cooling cavity (21) communicated with the axial through hole (8), one end of the cooling liquid inlet pipe (22) stretches into the cooling cavity (21), and the cooling liquid outlet pipe (23) is communicated with the end, far away from the cutting tool (7), of the axial through hole (8); the other end of the screen body (2) is also provided with a rope connected with the screen body (2); the shielding screen is also provided with a magnetic material body (20) embedded in the screen body (2).
2. The ash removal system of an alkali recovery boiler according to claim 1, characterized in that the top of the impact hammer (12) is provided with an umbrella-shaped inserting rod (201) for connecting with the unhooking mechanism (13); the unhooking mechanism (13) is provided with a bracket (202); a first hook (203) and a second hook (204) with one end hinged with the bracket (202); a tension spring (205) with two ends respectively connected with the first hook (203) and the second hook (204); a second pulley (206) and a third pulley (207) respectively connected with two ends of the bracket (202); a pressing rod (208) with the middle part hinged with the bracket (202); the first end is connected with one end of the compression bar (208), and the other end of the compression bar spans over a second pulley (206) and then is connected with a second steel wire rope (209) of the first hook (203); the first end is connected with one end of the compression bar (208), and the other end sequentially spans over a second pulley (206) and a third pulley (207) and then is connected with a third steel wire rope (210) of the second hook (204); the bottom surfaces of the first hook (203) and the second hook (204) are respectively provided with an inclined surface which can slide along the top surface of the umbrella-shaped inserting connection rod (201); the second pulley (206) has at least two grooves, and the second wire rope (209) and the third wire rope (210) are wound in different grooves, respectively.
3. The ash removal system of an alkali recovery boiler according to claim 2, further comprising a limiting block (211) connected to the bracket (202), wherein the limiting block (211) limits the lowest descending position of the connection end of the compression rod (208) with the second wire rope (209) and the third wire rope (210).
4. The ash removal system of the alkali recovery boiler according to claim 2, wherein a slide bar is arranged on one side of the upright (11) close to the impact hammer (12) along the axial direction, and the impact hammer (12) and the unhooking mechanism (13) are respectively provided with a sliding sleeve in sliding connection with the slide bar.
5. The ash removing method of the alkali recovery boiler is characterized in that a shielding screen, a movable perforating device and a movable drill rod hammer are used in the ash removing process; the shielding screen comprises a screen body (2) which can be rolled up, and a plurality of ropes (3) which are respectively connected with one end of the screen body (2); the perforating device comprises a hydraulic motor (4), an operating mechanism (5) connected with the hydraulic motor (4), a rotating shaft (6) in transmission connection with the hydraulic motor (4), and a cutting tool (7) detachably connected with the end, far away from the hydraulic motor (4), of the rotating shaft (6); the drill rod hammer comprises a frame (10), a vertical rod (11) with a first end connected with the frame (10), an impact hammer (12) connected with the vertical rod (11) in a sliding manner, a unhooking mechanism (13) connected with the impact hammer (12) in a detachable manner and connected with the vertical rod (11) in a sliding manner, a touch rod (14) connected with the vertical rod (11) and used for triggering the unhooking mechanism (13) to unhook, a first pulley (15) connected with the other end of the vertical rod (11), a push rod, a cylinder or a hydraulic cylinder (16) connected with the frame (10), a first steel wire rope (17) with the unhooking mechanism (13) after the other end crosses the first pulley (15), a steel drill rod (18) connected with the frame (10) through a sliding sleeve, and an operating rod (19) connected with the frame (10); the rotary shaft (6) is provided with an axial through hole (8), a rotary joint (9) connected with the end, far away from the cutting tool (7), of the axial through hole (8), a cooling liquid inlet pipe (22) and a cooling liquid outlet pipe (23) connected with the rotary joint (9), the cutting tool (7) is provided with a cooling cavity (21) communicated with the axial through hole (8), one end of the cooling liquid inlet pipe (22) stretches into the cooling cavity (21), and the cooling liquid outlet pipe (23) is communicated with the end, far away from the cutting tool (7), of the axial through hole (8); the ash removal process comprises the following steps: opening a manhole (24) of an alkali recovery boiler, removing partial dust deposit around the manhole (24) and in the boiler, enabling personnel to enter the alkali recovery boiler, transferring a rolled shielding screen into the alkali recovery boiler from the manhole (24), binding a rope (3) connected with one end of a screen body (2) on a boiler pipeline (1) at a hearth outlet, and enabling the other end of the screen body (2) to reach the surface of a dust deposit layer after being unfolded; manually removing accumulated ash attached to the top of a hearth outlet of an alkali recovery boiler and the side wall and the surface of an accumulated ash layer, after the accumulated ash is easy to fall off, transferring an opening device into the alkali recovery boiler from a manhole (24), pulling an external hydraulic oil pipe and a cooling liquid pipe into the alkali recovery boiler through the manhole (24) or an operation hole of the alkali recovery boiler, connecting a hydraulic motor (4) of the opening device with the external hydraulic oil pipe, connecting a cooling liquid inlet pipe (22) and a cooling liquid outlet pipe (23) of the opening device with the external cooling liquid pipe, moving a cutting tool (7) of the opening device to the surface of the accumulated ash layer, operating the opening device, cutting a plurality of blind holes on the surface of the accumulated ash layer, and intersecting or approaching each other adjacent blind holes; a drill rod hammer is delivered into an alkali recovery boiler from a manhole (24), an external power source pipeline is pulled into the alkali recovery boiler through the manhole (24) or an alkali recovery boiler operation hole, a push rod, a cylinder or a hydraulic cylinder (16) of the drill rod hammer is connected with the power source pipeline which is externally input, a steel drill (18) of the drill rod hammer is moved to the side of a blind hole cut by an opening device, the drill rod hammer is operated, a part of the steel drill (18) is driven into an ash deposition layer, a hand operating rod (19) is used for prying the steel drill (18) to enable ash deposition to fall off, and fallen ash deposition blocks are moved out of the furnace from the manhole (24) or broken and then fall into an ash bucket through an alkali recovery boiler tube bundle; and (3) repeatedly using the perforating device to perforate after cleaning the deposited ash, hammering steel bars by using a drill rod, and prying the steel bars until the deposited ash is cleaned.
6. The ash removal method of an alkali recovery boiler according to claim 5, wherein the other end of the screen body (2) is also provided with a rope connected with the screen body (2), and the other end of the screen body (2) is bound to the boiler pipeline (1) at the outlet of the hearth through the rope connected with the screen body.
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