CN111810935A - Manufacturing method of external economizer module of large garbage boiler - Google Patents
Manufacturing method of external economizer module of large garbage boiler Download PDFInfo
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- CN111810935A CN111810935A CN202010057311.7A CN202010057311A CN111810935A CN 111810935 A CN111810935 A CN 111810935A CN 202010057311 A CN202010057311 A CN 202010057311A CN 111810935 A CN111810935 A CN 111810935A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22D—PREHEATING, OR ACCUMULATING PREHEATED, FEED-WATER FOR STEAM GENERATION; FEED-WATER SUPPLY FOR STEAM GENERATION; CONTROLLING WATER LEVEL FOR STEAM GENERATION; AUXILIARY DEVICES FOR PROMOTING WATER CIRCULATION WITHIN STEAM BOILERS
- F22D1/00—Feed-water heaters, i.e. economisers or like preheaters
- F22D1/16—Feed-water heaters, i.e. economisers or like preheaters with water tubes arranged otherwise than in the boiler furnace, fire tubes, or flue ways
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
- F28F9/00—Casings; Header boxes; Auxiliary supports for elements; Auxiliary members within casings
- F28F9/02—Header boxes; End plates
- F28F9/04—Arrangements for sealing elements into header boxes or end plates
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Abstract
The invention discloses a manufacturing method of an external economizer module of a large-scale garbage boiler, belonging to the technical field of boiler equipment, aiming at adapting to the development of the large-scale garbage boiler, the modularization degree of the large-scale garbage boiler is very high, each external economizer module needs to put hundreds of groups of double-pipe heat exchange tubes which are fully distributed with fins into a box body, and dozens of external economizer modules with the diameter of dozens are uniformly distributed on the upper flange surface and the lower flange surface of each external economizer module
The invention provides an optimized manufacturing method of an external economizer module of a large-scale garbage boiler, matched processing equipment and matched tooling, which can greatly ensure the punching rate when the modules are stacked on a construction site, and a large number of intensive 90-degree elbows and 180-degree elbows are required to be welded at two ends of a double-pipe heat exchange pipe on the external economizer moduleThe manufacturing efficiency and the manufacturing quality are improved, and therefore considerable economic benefits can be brought to boiler manufacturing enterprises.
Description
Technical Field
The invention relates to a manufacturing method of an external economizer module of a large garbage boiler, belonging to the technical field of boiler equipment.
Background
In order to adapt to the development of large-scale garbage boilers, the modularization degree of the large-scale garbage boilers is very high, for example, 6 large-scale garbage boilers accepted by our factory are provided, each garbage boiler is provided with 6 vertical stacked external coal economizer modules, the 6 large-scale garbage boilers have 36 external coal economizer modules, hundreds of groups of double-tube heat exchange tubes which are fully distributed with fins are arranged in each module box body, the hundreds of groups of double-tube heat exchange tubes which are fully distributed with fins need to be placed in the module box body, the hundreds of groups of double-tube heat exchange tubes which are fully distributed with fins can only complete tube penetration from the inside of the module box body, tubes at two ends of the double-tube heat exchange tubes which are fully distributed with fins respectively penetrate through holes on front and rear wall plates of the module box body, then a large number of 180-degree elbows are arranged outside the module box body to connect the double-tube heat exchange tubes which, the header is mounted outside the tank as part of the module or a large number of 90 degree bends are used to connect the loops between each module, and the external economizer module needs to be manufactured and subjected to stacking tests in the factory.
Hundreds of groups of double-tube heat exchange tubes with fins are required to be placed in a box body of each external economizer module, the fins of the double-tube heat exchange tubes with the fins are almost tightly attached to the inner wall of the box body, the difference between the outer diameters of holes in the shell and the outer diameters of the double-tube heat exchange tubes is only 1.5mm, the module box body cannot be manufactured firstly, then the double-tube heat exchange tubes with the fins penetrate into the module box body from the outside of the module box body, and due to the fact that pitch errors exist in hole machining on the shell, the pitch errors and distortion deformation exist in the double-tube heat exchange tubes with the fins, pipe penetrating of the hundreds of groups of double-tube heat exchange tubes with the fins becomes a great technical problem, and.
Dozens of coal economizer modules with the diameter of dozens are uniformly distributed on the upper flange surface and the lower flange surface of each external coal economizer module
When the external economizer modules are stacked on a construction site, bolt holes in flanges of all the external economizer modules must be aligned to ensure the perforation rate, the external economizer modules are not allowed to turn over for 180 degrees due to the structural limitation of the external economizer modules, bolt holes in the flanges of the external economizer modules cannot be drilled from top to bottom, and if a scribing method is adopted to vertically drill holes from bottom to top by using a magnetic drill, the operation is extremely difficult and the drilling deviation is easy, so that the perforation rate is ensured, the EHS risk is avoided, and the module deformation is also a technical problem.
A large number of 90-degree elbows and 180-degree elbows need to be welded at two ends of a double-pipe heat exchange pipe on the external economizer module, and due to the fact that the elbows are too dense, if the assembly and welding sequence is incorrect, obstacles can be formed on welding operation, and difficulty is caused in repair of welding defects.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a manufacturing method of an external economizer module of a large garbage boiler.
The invention is realized by the following technical scheme: a manufacturing method of an external economizer module of a large garbage boiler is characterized by comprising the following steps: each garbage boiler is provided with 6 vertical stacked external economizer modules, hundreds of groups of double-tube heat exchange tubes with fins are arranged in each module box body, hundreds of groups of double-tube heat exchange tubes with fins are penetrated from the inside of the module box body by using a special assembly tool, an upper drill plate, a lower drill plate and a magnetic drill are used, and the manual hydraulic lift truck are matched to complete the drilling of the bolt holes on the upper flange and the lower flange of the module box body, then a large number of 180-degree elbows are used outside the module box body to connect the double-pipe heat exchange pipes fully distributed with the fins to form loops, then a large number of 90-degree elbows are used to connect each loop into a header outside the box body, the header is arranged outside the module box body to form a part of an external economizer module, or a large number of 90-degree elbows are used for connecting loops among all the external economizer modules, and the external economizer modules are manufactured and subjected to stacking tests in a factory.
The manufacturing method of the large-scale garbage boiler external type economizer module comprises the following steps:
step 1: optimizing the manufacturing process method of the external economizer module box body of the large-scale garbage boiler, because the outer diameter of the tube of the double-tube heat exchange tube which is fully distributed with fins is 1.5mm different from the aperture of the front wall plate of the module box body and the aperture of the back wall plate of the module box body, theoretically, the single-side gap is only 0.75mm, the tube pitch of the double-tube heat exchange tube which is fully distributed with fins is 90mm, the transverse pitch and the longitudinal pitch of the holes of the front wall plate of the module box body and the back wall plate of the module box body are also 90mm, the longitudinal pitch of the holes of the front wall plate of the module box body and the back wall plate of the module box body is 90mm, the proper tolerance control requirement is given, the holes are processed by adopting a numerical control drilling mode or a laser hole cutting mode or a numerical control water jet cutting hole mode, then the welding and the correction are respectively completed according to the front wall plate of the module box body, and favorable conditions are provided for the tube penetration of the double-tube heat exchange tube fully distributed with the fins.
Step 2: fixing a module box front wall plate and a module box rear wall plate by adopting a special assembly tool, keeping the module box front wall plate and the module box rear wall plate parallel and the distance between the module box front wall plate and the module box rear wall plate is less than about 50mm of the length of a double-tube heat exchange tube fully distributed with fins, processing tubes at two ends of the double-tube heat exchange tube fully distributed with fins to a nominal length and finishing chamfering, then horizontally hoisting the double-tube heat exchange tube fully distributed with fins by utilizing a hoist crane and a gravity balancer to enable the double-tube heat exchange tube fully distributed with fins to enter from a hole of the module box front wall plate in an inclined manner in the horizontal direction, reducing the inclination angle while penetrating the tubes, reversely penetrating the double-tube heat exchange tube fully distributed with fins into a corresponding hole of the module box rear wall plate, placing the tubes at two ends of the double-tube heat exchange tube fully distributed with fins on the module box front wall plate and the module box rear wall plate, keeping the tube penetrating length, the installation and the welding module box both ends wallboard form complete module box, in order to prevent to lift by crane and the deformation of transportation in-process, suitably increase the rigidity in the middle of the module box, suitably increase interim skill in the middle of the module box and support and carry out welded connection with front and back wallboard, wait that the building site accomplishes and demolishs this interim support after external economizer module closed assembly and completion bolt perforation locking.
And step 3: and taking out the complete module box body after the pipe penetration is finished from a special assembly tool, respectively installing an upper drill plate and a lower drill plate on the upper flange surface and the lower flange surface of the module box body, and drilling by adopting a portable magnetic drill.
And 4, step 4: on accomplishing the module box, after the drilling of lower flange, continue to install and fixed collection case at module box outer wall according to the design requirement, installation and welding 90 degrees return bends and 180 degrees elbows, for the convenience of the assembly welding of elbow, the welding obstacle of minimizing, be convenient for inspect the butt weld mouth quality and be convenient for the repair of butt weld mouth, adopt from module box middle assembly welding 90 degrees elbows and 180 degrees elbows that begin, treat that the butt weld mouth inspection is qualified after, continue by middle to both sides repetition above-mentioned process.
And 5: and (4) finishing the positioning welding of the upper and lower rows of pipes with the front wall plate of the module box body and the rear wall plate of the module box body respectively, and finishing the welding of other accessories.
Step 6: and finishing the hydraulic test, the appearance size inspection and the stacking test of the external economizer module.
And 7: and finishing painting, packaging and shipping.
Preferably, the special assembly fixture in step 2 is characterized in that the special assembly fixture comprises a bottom frame, a fixed support frame and a movable support frame at the other side are arranged on one side of the upper plane of the bottom frame, a linear sliding guide device is arranged between the bottom frame and the movable support frame, a module box front wall plate and a module box rear wall plate are respectively fixed on the fixed support frame and the movable support frame, the module box front wall plate and the module box rear wall plate are kept parallel, the distance between the module box front wall plate and the module box rear wall plate is less than 50mm of the length of a double-pipe heat exchange pipe fully distributed with fins, the movable support frame and the frame are locked through a locking bolt, after the pipe penetrating is completed according to step 2, a plurality of manual hoists are arranged on the upper portions of the fixed support frame and the movable support frame, a plurality of mechanical jacks horizontally arranged at the, the rear end of the mechanical jack is provided with a support connected with the bottom frame, force can be transmitted to the bottom frame, the movable support frame and the frame locking bolt are loosened, external force is applied through the mechanical jack below and the hand block above, the movable support frame is driven to translate, so that the distance between the front wallboard of the module box body and the rear wallboard of the module box body meets the design requirements, and wallboards at two ends of the module box body are installed and welded to form a complete module box body.
Preferably, the special assembly fixture in step 2 is characterized in that the special assembly fixture comprises a bottom frame and movable support frames positioned on two sides of the upper plane of the bottom frame, a linear sliding guide device is arranged between the bottom frame and the movable support frames, a module box front wall plate and a module box rear wall plate are respectively fixed on the movable support frames, the module box front wall plate and the module box rear wall plate are kept parallel, the distance between the module box front wall plate and the module box rear wall plate is less than 50mm of the length of a double-tube heat exchange tube fully distributed with fins, the movable support frames and the frame are locked through locking bolts, after the tube penetrating is completed according to the step 2, a plurality of manual hoists are arranged on the upper portions of the two opposite movable support frames, a plurality of mechanical jacks horizontally arranged are arranged at the rear ends of the movable support frames, the front ends of the mechanical jacks can push the movable support frames to translate, and supports connected with the bottom, and loosening the movable support frame and the frame locking bolt, applying external force through the mechanical jack below and the hand block above, driving the movable support frame to translate so that the distance between the front wallboard of the module box body and the rear wallboard of the module box body meets the design requirement, and installing and welding the wallboards at the two ends of the module box body to form the complete module box body.
Preferably, the drill plate in step 3 is divided into an upper drill plate and a lower drill plate, the upper drill plate and the lower drill plate are overlapped to ensure consistency and interchangeability of guide holes on the upper drill plate and the lower drill plate, the lower drill plate is placed on an equal-height support, a module box body after pipe penetration is placed above the lower drill plate, a cross line of the module box body and the lower drill plate is aligned, the module box body and the lower drill plate are fixed by using an F-shaped clamp, the upper drill plate is installed above the module box body, the cross line of the module box body and the upper drill plate is aligned, the module box body and the upper drill plate are fixed by using the F-shaped clamp, then a magnetic drill is used for drilling holes, when a flange at the lower part of the module box body is drilled, the magnetic drill is vertically placed upside down and supported by using a simple support, then the drill is placed on the table top of a manual hydraulic lift truck, and the drill is close to or leave a workpiece by using the lifting function of the manual hydraulic, the drill bit of the magnetic drill is inserted into the hole of the lower drill template, the magnetic sucker is started to finish reverse drilling, and the manual hydraulic lifting vehicle is provided with the universal wheels and can move along the length direction of the lower drill template on the ground to change the drilling position.
The invention has the beneficial effects that: (1) hundreds of groups of double-tube heat exchange tubes with fins are required to be placed in the box body of each external economizer module, the fins of the double-tube heat exchange tubes with the fins are almost tightly attached to the inner wall of the box body, and the difference between the holes in the shell and the outer diameters of the double-tube heat exchange tubes is only 1.5mm, so that the module box body cannot be manufactured firstly, and then the double-tube heat exchange tubes with the fins penetrate into the module box body from the outside of the module box body. (2) The invention ensures the perforation rate after the modules are stacked and provides an effective solution, and matched processing equipment and tools. (3) The invention adopts the optimized manufacturing method of the external economizer module of the large-scale garbage boiler, and compared with the conventional method, the manufacturing efficiency and the manufacturing quality can be greatly improved, thereby bringing considerable economic benefits for boiler manufacturing enterprises.
Drawings
FIG. 1 is a schematic view of an assembly process and a special tooling of an external economizer module of a large-scale garbage boiler according to the present invention
FIG. 2 is a schematic view of the flange drilling on the external economizer module of the large-scale garbage boiler according to the present invention by using the template
FIG. 3 is a schematic view of a double-tube heat exchange tube with fins and 90-degree elbows and 180-degree elbows connected at two ends according to the present invention
In the figure: 1-external economizer module, 2-module box body, 3-module box body front wall plate, 4-module box body rear wall plate, 5-module box body two-end wall plate, 6-double-pipe heat exchange pipe with fins, 7-180-degree elbow, 8-90-degree elbow, 9-locking bolt, 10-module box body upper and lower flanges, 11-bolt hole, 12-special assembly tool, 13-bottom frame, 14-fixed support frame, 15-movable support frame, 16-linear sliding guide device, 17-mechanical jack, 18-upper drilling template, 19-lower drilling template, 20-magnetic drill, 21-manual hydraulic lift truck
Detailed Description
The embodiments of the present invention will be further described with reference to the accompanying drawings.
A manufacturing method of an external economizer module (1) of a large garbage boiler is characterized in that: each garbage boiler is provided with 6 vertical stacked external economizer modules (1), hundreds of groups of double-tube heat exchange tubes (6) which are fully distributed with fins are arranged in each module box body (2), hundreds of groups of double-tube heat exchange tubes (6) which are fully distributed with fins are penetrated from the inside of the module box body (2) by using a special assembly tool (12), holes of bolt holes (11) on upper and lower flanges (10) of the module box body are drilled by using an upper drilling template (18), a lower drilling template (19), a magnetic drill (20) and a manual hydraulic lifting vehicle (21) in a matching way, then the double-tube heat exchange tubes (6) which are fully distributed with fins are connected to form a loop by using a large number of 180-degree elbows (7) outside the module box body (2), each loop is connected into a header outside the box body by using a large number of 90-degree elbows (8), the header is arranged outside the module box body (2) and becomes a part of the external economizer modules (1), or a large number of 90-degree elbows (8) are used for connecting the loops among the external economizer modules (1), and the external economizer modules (1) are manufactured and assembled in a factory.
The manufacturing method of the large-scale garbage boiler external type economizer module comprises the following steps:
step 1: the manufacturing process method of the external economizer module box body (2) of the large-scale garbage boiler is optimized, because the difference between the outer diameter of the tube of the double-tube heat exchange tube (6) which is fully distributed with fins and the aperture on the front wall plate (3) of the module box body (2) and the back wall plate (4) of the module box body (2) is 1.5mm, theoretically, the unilateral clearance is only 0.75mm, the tube pitch of the double-tube heat exchange tube (6) which is fully distributed with fins is 90mm, the transverse and longitudinal pitches of the holes on the front wall plate (3) of the module box body (2) and the back wall plate (4) of the module box body (2) are also 90mm, the proper tolerance control requirement is given to the longitudinal pitch of the holes on the front wall plate (3) of the module box body (2) and the back wall plate (4) of the module box body (2), the holes are processed by adopting a numerical control drilling mode or a laser hole cutting mode, the assembly welding and the correction are respectively completed on the rear wall plate (4) of the module box body (2) and the two end wall plates (5) of the module box body (2), then the economizer module box body (2) is assembled in a trial mode, the four-side wall plate is disassembled after the economizer module box body is qualified through inspection and cross line marks are marked, and favorable conditions are provided for pipe penetrating of the double-pipe heat exchange pipe (6) fully distributed with fins.
Step 2: fixing a module box front wall plate (3) and a module box rear wall plate (4) by adopting a special assembly tool (12), keeping the module box front wall plate (3) and the module box rear wall plate (4) parallel and the distance between the module box front wall plate and the module box rear wall plate is less than about 50mm of the length of a double-tube heat exchange tube (6) fully distributed with fins, processing the tubes at two ends of the double-tube heat exchange tube (6) fully distributed with fins to the nominal length and finishing chamfering, then horizontally hoisting the double-tube heat exchange tube (6) fully distributed with fins by utilizing a hoist and a gravity balancer to enable the double-tube heat exchange tube (6) fully distributed with fins to enter from a hole of the module box front wall plate (3) in an inclined manner in the horizontal direction, reducing the inclination angle while penetrating the tubes, reversely penetrating the double-tube heat exchange tube (6) fully distributed with fins into a hole corresponding to the module box rear wall plate (4), placing the tubes at two ends of the double-tube heat exchange, keep each end poling length 25mm, after accomplishing all poling, utilize special assembly frock (12) with wallboard (3) before the module box or wallboard (4) translation fold behind the module box, installation and welding module box both ends wallboard (5) form complete module box (2), in order to prevent to lift by crane and the deformation of transportation in-process, suitably increase the rigidity in the middle of module box (2), suitably increase interim support and carry out welded connection with wallboard around in the middle of module box (2), wait to the building site and accomplish external economizer module (1) closed assembly and accomplish and demolish this interim support after bolt perforation locking.
And step 3: and taking the complete module box body (2) after the pipe penetration is finished out of the special assembly tool (12), respectively installing an upper drilling template (18) and a lower drilling template (19) on the upper flange surface and the lower flange surface (10) of the module box body (2), and drilling by adopting a portable magnetic drill.
And 4, step 4: after drilling holes in the upper flange (10) and the lower flange (2) of the module box body, continuously installing and fixing a header on the outer wall of the module box body (2) according to design requirements, and installing and welding a 90-degree elbow (8) and a 180-degree elbow (7); in order to facilitate the assembly and welding of the elbow, reduce welding obstacles as much as possible, facilitate the inspection of the quality of the butt-welded junction and facilitate the repair of the butt-welded junction, the assembly and welding of a 90-degree elbow (8) and a 180-degree elbow (7) are carried out from the middle of the module box body (2), and after the butt-welded junction is inspected to be qualified, the procedures are continuously repeated from the middle to two sides.
And 5: and (3) completing the positioning welding of the upper and lower rows of pipes with the front wall plate (3) of the module box body and the rear wall plate (4) of the module box body respectively, and completing the welding of other accessories.
Step 6: and finishing the hydraulic test, the appearance size inspection and the stacking test of the external economizer module (1).
And 7: and finishing painting, packaging and shipping of the external economizer module (1).
Preferably, the special assembly fixture (12) in the step 2 is characterized in that the special assembly fixture (12) comprises a bottom frame (13), a fixed support frame (14) and a movable support frame (15) at the other side are arranged on one side of the upper plane of the bottom frame (12), a linear sliding guide device (16) is arranged between the bottom frame (13) and the movable support frame (15), the module box body front wall plate (3) and the module box body rear wall plate (4) are respectively fixed on the fixed support frame (14) and the movable support frame (15), the distance between the module box body front wall plate (3) and the module box body rear wall plate (4) is kept to be smaller than the length of a double-tube heat exchange tube (6) fully distributed with fins by about 50mm, the movable support frame (15) and the frame (13) are locked by a locking bolt (9), and after the tube penetrating is completed according to the step 2, a plurality of hand hoists are arranged on the upper parts of the fixed support frame (14) and the movable support frame (15), a plurality of mechanical jacks (17) which are horizontally arranged are arranged at the rear ends of the movable support frames (15), the front ends of the mechanical jacks (17) can push the movable support frames (15) to translate, the rear ends of the mechanical jacks (17) are provided with supports connected with the bottom frame (13) to transmit force to the bottom frame (13), the movable support frames (15) and the locking bolts (9) of the frames (13) are loosened, external force is applied through a mechanical jack (17) below and a manual hoist above, a movable support frame (15) is driven to translate, so that the distance between a front wallboard (3) of the module box body and a rear wallboard (4) of the module box body meets the design requirement, and wallboards (5) at two ends of the module box body are installed and welded to form a complete module box body (2).
Preferably, the special assembly tool (12) in the step 2 is characterized in that the special assembly tool (12) comprises a bottom frame (13) and movable support frames (15) positioned at two sides of the upper plane of the bottom frame (12), a linear sliding guide device (16) is arranged between the bottom frame (13) and the movable support frames (15), a module box front wall plate (3) and a module box rear wall plate (4) are respectively fixed on the movable support frames (15), the module box front wall plate (3) and the module box rear wall plate (4) are kept parallel, the distance between the module box front wall plate and the module box rear wall plate is smaller than about 50mm of the length of a double-tube heat exchange tube (6) fully distributed with fins, the movable support frames (15) and the frame (13) are locked through locking bolts (9), and a plurality of hand hoists are arranged on the upper portions of the two opposite movable support frames (15) after tube penetrating is completed, mechanical jack (17) of placing of a plurality of levels of installation are in mobilizable support frame (15) rear end, mechanical jack (17) front end can promote mobilizable support frame (15) translation, the rear end of mechanical jack (17) has the support of being connected with underframe (13) can transmit power to underframe (13), loosen mobilizable support frame (15) and frame (13) locking bolt (9), exert external force through mechanical jack (17) and the hand-block of top below, thereby drive mobilizable support frame (15) and produce the translation and make the distance between wallboard (3) and module box rear wall board (4) accord with the design requirement before the module box, wallboard (5) at installation and welding module box both ends form complete module box (2).
Preferably, the drilling template in the step 3 is divided into an upper drilling template (18) and a lower drilling template (19), the upper drilling template (18) and the lower drilling template (19) adopt a stacked drilling mode to ensure the consistency and interchangeability of guide holes on the upper drilling template (18) and the lower drilling template (19), the lower drilling template (19) is placed on an equal-height support, the module box body (2) after pipe penetration is placed above the lower drilling template (19), the cross lines of the module box body (2) and the lower drilling template (19) are aligned, the module box body (2) and the lower drilling template (19) are fixed by an F-shaped clamp, the upper drilling template (18) is installed above the module box body (2), the cross lines of the module box body (2) and the upper drilling template (18) are aligned, the module box body (2) and the upper drilling template (18) are fixed by the F-shaped clamp, and then a magnetic drill (20) is used for drilling, when a flange (10) at the lower part of the module box body is used for drilling, a magnetic drill (20) is vertically placed upside down and supported by a simple support, then the magnetic drill is placed on the table top of a manual hydraulic lifting vehicle (21), the magnetic drill (20) is close to or away from a workpiece by utilizing the lifting function of the manual hydraulic lifting vehicle (21), a drill bit of the magnetic drill (20) is inserted into a hole of a lower drill template (19), a magnetic suction disc is started to finish reverse drilling, the manual hydraulic lifting vehicle (21) is provided with universal wheels, and the drilling position can be changed by moving along the length direction of the lower drill template (19) on the ground.
The foregoing is only a preferred embodiment of this invention and it should be noted that modifications can be made by those skilled in the art without departing from the principle of the invention and these modifications should also be considered as the protection scope of the invention.
Claims (4)
1. A manufacturing method of an external economizer module of a large garbage boiler is characterized by comprising the following steps: each garbage boiler is provided with a plurality of vertical stacked external economizer modules, hundreds of groups of double-tube heat exchange tubes which are fully distributed with fins are arranged in each module box body, the hundreds of groups of double-tube heat exchange tubes which are fully distributed with fins are penetrated from the inside of the module box body by using a special assembly tool, the drilling of bolt holes on upper and lower flanges of the module box body is completed by using an upper drilling template, a lower drilling template, a magnetic drill and a manual hydraulic lifting car, then the double-tube heat exchange tubes which are fully distributed with fins are connected by using a large number of 180-degree elbows outside the module box body to form a loop, each loop is connected into a header outside the box body by using a large number of 90-degree elbows, the header is arranged at the outer side of the module box body to form a part of the external economizer modules, or the loops between the external economizer modules are connected by using a large number of 90-degree elbows, and the external economizer modules are, the manufacturing method of the large-scale garbage boiler external type economizer module comprises the following steps:
step 1: optimizing the manufacturing process method of the external economizer module box body of the large-scale garbage boiler, because the outer diameter of the tube of the double-tube heat exchange tube which is fully distributed with fins is 1.5mm different from the aperture of the front wall plate of the module box body and the aperture of the back wall plate of the module box body, theoretically, the single-side clearance is only 0.75mm, the tube pitch of the double-tube heat exchange tube which is fully distributed with fins is 90mm, the transverse pitch and the longitudinal pitch of the holes of the front wall plate of the module box body and the back wall plate of the module box body are also 90mm, the longitudinal pitch of the holes of the front wall plate of the module box body and the back wall plate of the module box body is given proper tolerance control requirements, the holes are processed by adopting a numerical control drilling mode or a laser hole cutting mode or a numerical control water jet cutting hole cutting mode, then the welding and the correction are respectively completed according to the front wall plate of the module box body, the back wall, favorable conditions are provided for the tube penetration of the double-tube heat exchange tube fully distributed with the fins;
step 2: fixing a module box front wall plate and a module box rear wall plate by adopting a special assembly tool, keeping the module box front wall plate and the module box rear wall plate parallel and the distance between the module box front wall plate and the module box rear wall plate is less than about 50mm of the length of a double-tube heat exchange tube fully distributed with fins, processing tubes at two ends of the double-tube heat exchange tube fully distributed with fins to a nominal length and finishing chamfering, then horizontally hoisting the double-tube heat exchange tube fully distributed with fins by utilizing a hoist crane and a gravity balancer to enable the double-tube heat exchange tube fully distributed with fins to enter from a hole of the module box front wall plate in an inclined manner in the horizontal direction, reducing the inclination angle while penetrating the tubes, reversely penetrating the double-tube heat exchange tube fully distributed with fins into a corresponding hole of the module box rear wall plate, placing the tubes at two ends of the double-tube heat exchange tube fully distributed with fins on the module box front wall plate and the module box rear wall plate, keeping the tube penetrating length, installing and welding wallboards at two ends of the module box body to form a complete module box body, properly increasing the rigidity in the middle of the module box body in order to prevent deformation in the hoisting and transferring processes, properly adding a temporary support in the middle of the module box body to be welded and connected with front and rear wallboards, and removing the temporary support after the external economizer modules are stacked and the bolt perforation locking is completed in a construction site;
and step 3: taking out the complete module box body after the pipe penetration is finished from a special assembly tool, respectively installing an upper drill plate and a lower drill plate on the upper flange surface and the lower flange surface of the module box body, and drilling by adopting a portable magnetic drill;
and 4, step 4: after drilling holes in the upper flange and the lower flange of the module box body, continuously installing and fixing a header on the outer wall of the module box body according to design requirements, installing and welding a 90-degree elbow and a 180-degree elbow, so that the assembly and welding of the elbow are facilitated, the welding obstacles are reduced as much as possible, the quality of a butt weld joint is conveniently checked, and the repair of the butt weld joint is facilitated;
and 5: the upper and lower rows of pipes are respectively welded with the front wall plate of the module box body and the rear wall plate of the module box body in a positioning manner, and other accessories are welded;
step 6: completing a hydraulic test, an outline dimension check and a stacking test of the external economizer module;
and 7: and finishing painting, packaging and shipping.
2. The manufacturing method of the external economizer module of the large garbage boiler according to claim 1, characterized in that: the special assembly tool in the step 2 is characterized in that the special assembly tool comprises a bottom frame, a fixed support frame and a movable support frame, wherein the fixed support frame and the movable support frame are arranged on one side of the upper plane of the bottom frame, a linear sliding guide device is arranged between the bottom frame and the movable support frame, a module box front wall plate and a module box rear wall plate are respectively fixed on the fixed support frame and the movable support frame, the module box front wall plate and the module box rear wall plate are kept parallel, the distance between the module box front wall plate and the module box rear wall plate is less than 50mm of the length of a double-pipe heat exchange pipe fully distributed with fins, the movable support frame and the frame are locked through a locking bolt, after the pipe penetrating is completed according to the step 2, a plurality of hand hoists are arranged on the upper portions of the fixed support frame and the movable support frame, the rear end of the mechanical jack is provided with a support connected with the bottom frame, force can be transmitted to the bottom frame, the movable support frame and the frame locking bolt are loosened, external force is applied through the mechanical jack below and the hand block above, the movable support frame is driven to translate, so that the distance between the front wallboard of the module box body and the rear wallboard of the module box body meets the design requirements, and wallboards at two ends of the module box body are installed and welded to form a complete module box body.
3. The manufacturing method of the external economizer module of the large garbage boiler according to claim 1, characterized in that: the special assembly tool in the step 2 is characterized in that the special assembly tool comprises a bottom frame and movable support frames positioned on two sides of the upper plane of the bottom frame, a linear sliding guide device is arranged between the bottom frame and the movable support frames, a module box front wall plate and a module box rear wall plate are respectively fixed on the movable support frames, the module box front wall plate and the module box rear wall plate are kept parallel, the distance between the module box front wall plate and the module box rear wall plate is less than 50mm of the length of a double-tube heat exchange tube fully distributed with fins, the movable support frames and the frame are locked through locking bolts, after the tube penetrating is completed according to the step 2, a plurality of hand hoists are arranged on the upper portions of the two opposite movable support frames, a plurality of mechanical jacks horizontally arranged are arranged at the rear ends of the movable support frames, the front ends of the mechanical jacks can push the movable support frames to move horizontally, and supports connected, and loosening the movable support frame and the frame locking bolt, applying external force through the mechanical jack below and the hand block above, driving the movable support frame to translate so that the distance between the front wallboard of the module box body and the rear wallboard of the module box body meets the design requirement, and installing and welding the wallboards at the two ends of the module box body to form the complete module box body.
4. The manufacturing method of the external economizer module of the large garbage boiler according to claim 1, characterized in that: the drilling template in the step 3 is divided into an upper drilling template and a lower drilling template, the upper drilling template and the lower drilling template adopt a stacked drilling mode to ensure the consistency and interchangeability of guide holes on the upper drilling template and the lower drilling template, the lower drilling template is placed on an equal-height support, a module box body after pipe penetration is placed above the lower drilling template, the cross lines of the module box body and the lower drilling template are aligned, the module box body and the lower drilling template are fixed by an F-shaped clamp, the upper drilling template is installed above the module box body, the cross lines of the module box body and the upper drilling template are aligned, the module box body and the upper drilling template are fixed by the F-shaped clamp, then a magnetic drill is used for drilling, when a flange at the lower part of the module box body is drilled, the magnetic drill is vertically placed upside down and supported by a simple support, then the drill is placed on the table board of a manual hydraulic lift truck, and the magnetic drill is close to or away from a workpiece by utilizing the lifting function, the drill bit of the magnetic drill is inserted into the hole of the lower drill template, the magnetic sucker is started to finish reverse drilling, and the manual hydraulic lifting vehicle is provided with the universal wheels and can move along the length direction of the lower drill template on the ground to change the drilling position.
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| CN202010057311.7A CN111810935A (en) | 2020-01-17 | 2020-01-17 | Manufacturing method of external economizer module of large garbage boiler |
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Application publication date: 20201023 |