Sliding installation method for sintering waste heat boiler evaporator equipment

Abstract

The invention relates to the technical field of sintering waste heat boilers, in particular to a sliding installation method for sintering waste heat boiler evaporator equipment, which comprises the following steps of: building a sliding platform on each of two sides of a sintering chamber; a sliding trolley is hoisted to the sliding platform, and evaporator equipment is assembled on the ground and hoisted to the sliding trolley; cutting and dismantling the flue; the supporting beam is used for installing evaporator equipment; limiting pieces are arranged on the two sides of the sliding platform, and after a supporting bracket is welded to the periphery of the evaporator equipment, the sliding trolley is driven by a chain block to slide till the evaporator equipment slides in place; and the sliding trolley is removed, and the sliding platform is dismantled. According to the method, the limitation of site construction space is solved by adopting an integral slippage mode, the safety risk caused by hoisting operation is greatly reduced, the time efficiency is greatly saved, meanwhile, the safety risk of high-altitude splicing is reduced through ground splicing and integral slippage of equipment, and the mounting precision is improved.

Description

Technical Field

[0001] The invention relates to the technical field of sintering waste heat boilers, and in particular to a sliding installation method for sintering waste heat boiler evaporator equipment. Background Art

[0002] In the iron and steel plant's sintering flue waste heat utilization and renovation project, the sintering flue plans to utilize the waste heat at the tail end of the flue of 1#, 2#, and 3# sintering machines (sintering area 3×550㎡) through the waste heat recovery technology of the waste heat boiler. The waste heat is recovered and converted into steam by adding a waste heat boiler at the tail end of the flue. The produced steam is mainly transported by pipeline to the newly built steam turbine generator set for power generation (the generator set is planned and implemented separately by the energy and power project team). At the same time, a preset interface is set to send it to the backup circuit of the existing two steam turbine generator sets and the temperature and pressure reduction device.

[0003] Among them, the evaporator equipment of the waste heat boiler is an important equipment in the waste heat recovery system and the most critical existence in the entire system. Each waste heat boiler of the sintering system has four evaporator equipment, namely superheated evaporator assembly (including superheater and evaporator) 1: length, width and height are 6.04m*2.8m*6.09m, and weight is 44t; evaporator 2: length, width and height are 6.04m*1.91m*6.32m, and weight is 38t; evaporator 3: length, width and height are 6.24m*1.96m*6620m, and weight is 40t; evaporator 4: length, width and height are 6.19m*1.68m*6.62m, and weight is 37t. When leaving the factory, each of the four evaporators is divided into upper and lower parts, and then transported to the site for assembly on the ground. Each sintering waste heat recovery system has two large flues located within the sintering chamber, each equipped with two evaporators. On-site inspections revealed a large number of pipes surrounding the sintering chamber, and the evaporators were installed within the flues. The installation space was too narrow for the evaporators, and the large size and weight of the evaporators and superheater modules made it difficult to position and maneuver a large crane. Consequently, the evaporators could not be hoisted into place in one go. Therefore, technical personnel in this field were dedicated to the research of how to install the evaporators. Summary of the Invention

[0004] In view of the above-mentioned problems, the present invention provides a sliding installation method for an evaporator device of a sintering waste heat boiler, so as to solve the problem of difficulty in installing the evaporator device in the prior art.

[0005] A sliding installation method for an evaporator device of a sintering waste heat boiler comprises the following steps:

[0006] Step S1: constructing a sliding platform on each side of the sintering chamber, wherein the sliding platform includes a support frame and a platform plate located on the support frame;

[0007] Step S2: hoisting the skid trolley onto the skid platform, and assembling the evaporator equipment on the ground and hoisting it onto the skid trolley, wherein the skid trolley is connected to a hand chain hoist;

[0008] Step S3: cutting and dismantling the flue after the scheduled maintenance shutdown;

[0009] Step S4: installing a support beam of the evaporator device at the flue cutting position, wherein the support beam comprises a crossbeam and a sliding beam connected to the crossbeam, and the upper flange of the sliding beam is beveled and welded to the crossbeam;

[0010] Step S5: After setting a limiter on the sliding platform and welding a supporting bracket on each side of the evaporator equipment, the sliding trolley is driven by a hand chain hoist to slide until the evaporator equipment slides into place;

[0011] Among them, when the sliding trolley deviates, the evaporator equipment is lifted up from the supporting bracket by a jack to adjust the movement direction of the sliding trolley;

[0012] Step S6: Using a jack to support the evaporator device at the supporting bracket to remove the sliding trolley, and after installing the rolling guide rail at the bottom of the evaporator device in place, using a jack to place the evaporator device on the rolling guide rail, and after the evaporator device is adjusted into place, using a wrapping welding method to weld the pipes at both ends of the evaporator device to the evaporator device;

[0013] Step S7: dismantling the sliding platform.

[0014] In some embodiments, before performing step S1, the method further includes:

[0015] Divide the evaporator equipment into an assembly area, a hoisting area, and an evaporator sliding area, and after leveling and compacting the site in the evaporator sliding area, pave the base plate in the evaporator sliding area.

[0016] In some of these embodiments, the evaporator apparatus includes a superheat evaporator assembly and an evaporator.

[0017] In some embodiments, the skid trolley is a tank.

[0018] In some embodiments, an L-shaped notch is cut at the intersection of the support frame and the concrete beam of the sintering chamber, and the support frame is overlapped on the top of the concrete beam through the L-shaped notch.

[0019] In some embodiments, the web of the sliding beam is pressed against the web of the cross beam and is welded to the web of the cross beam on three sides.

[0020] In some embodiments, in step S3, when the flue is cut, a hand hoist is used to hang the flue.

[0021] In some embodiments, the platform plate is a steel plate.

[0022] In some embodiments, in step S5, the limiting member is an angle steel, and the limiting member is welded and fixed to the platform plate.

[0023] In some embodiments, the sliding trolley is connected to two 10t hand hoists.

[0024] Compared with the prior art, the present invention has at least one of the following advantages or beneficial effects:

[0025] The present invention discloses a sliding installation method for sintering waste heat boiler evaporator equipment. The method adopts an overall sliding method to solve the problem of space constraints caused by on-site construction, greatly reduces the safety risks brought by hoisting operations, and greatly saves time. In addition, this method reduces the safety risks of high-altitude assembly and improves installation accuracy through ground assembly and overall equipment sliding. At the same time, it can maximize the utilization rate of personnel, machinery, and materials (sliding platforms can be reused), effectively solving the safety, quality, and construction period issues caused by construction space constraints in projects. This method has high operating efficiency, more reasonable space and time application, greatly saving work efficiency time and reducing safety and quality risk factors. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The present invention and its features, configurations, and advantages will become more apparent upon reading the detailed description of non-limiting embodiments with reference to the following drawings. Like reference numerals indicate like parts throughout the drawings. The drawings are not necessarily drawn to scale, emphasis being placed on illustrating the subject matter of the present invention.

[0027] Figure 1 This is a top view of the north side sliding platform and support beam structure in an embodiment of the present invention;

[0028] Figure 2 This is a schematic front cross-sectional view of a sliding installation structure of a sintering waste heat boiler evaporator device according to an embodiment of the present invention;

[0029] Figure 3 It is a side cross-sectional schematic diagram of the sliding installation structure of the sintering waste heat boiler evaporator equipment in an embodiment of the present invention;

[0030] In the figure: 1. Support frame; 11. Roadbed plate; 12. Pillar; 13. Cross bar; 14. Diagonal brace; 2. Platform plate; 3. Cross beam; 4. Sliding beam; 5. Sliding trolley; 6. Evaporator equipment; 7. Support bracket; 8. Anti-dumping bracket; 9. Fence; 10. Hand hoist;. DETAILED DESCRIPTION

[0031] The present invention will be further described below with reference to the accompanying drawings and specific embodiments, but they are not intended to limit the present invention:

[0032] The assembly and sliding installation of waste heat boiler evaporator equipment require thorough planning from the early stages of construction. First, the material transportation channel, evaporator equipment assembly, and sliding platform site layout should be well planned on the plane. In terms of space, the relationship between the sliding platform layout and the installation position should be fully considered to ensure that the sliding is in place at one time. The crane's position, turning radius, and displacement deviation during sliding installation should also be taken into consideration.

[0033] Zhanjiang Steel installed a waste heat boiler (HRSG) at the tail end of each of the 1, 2, and 3# sintering flues. Each HRSG has four evaporator units (one superheated evaporator assembly and three evaporators), totaling 12 units. Each unit is divided into upper and lower sections. Based on the overall floor plan and spatial arrangement, the skid platform was installed, the evaporators were assembled on the ground, and then hoisted onto the skid platform using a 260t truck crane. The evaporators were then skidded into place for installation. The main process flow for the skid installation of the evaporator equipment for the sintering HRSG is as follows: ground leveling - laying the roadbed - skid platform assembly - evaporator assembly and hoisting onto the skid platform - flue cutting and removal - installation of the evaporator chamber skid beam - evaporator skidding - skid trolley removal, pipe and equipment welding - equipment inspection and acceptance, and skid platform removal.

[0034] like Figures 1 to 3 As shown, this embodiment discloses a sliding installation method for a sintering waste heat boiler evaporator device. Specifically, the method includes the following steps:

[0035] Step S1: To meet the construction requirements of the evaporator equipment 6, a sliding platform is built on the north and south sides of the sintering chamber (the size of the sliding platform on the north side is 5500*7535*7000mm, and the size of the sliding platform on the south side is 5500*5800*7000mm); Figure 1The sliding platform is located on the north side of the structure. The sliding platform comprises a support frame 1 and a platform plate 2 located on the support frame 1. The platform plate 2 is a steel plate approximately 20 mm thick. The support frame 1 includes pillars 12, crossbars 13, and diagonal braces 14. The platform plate 2 is also provided with a fence 9 and an anti-dump bracket 8. The fence 9 is a protective railing to ensure the safety of construction workers. The anti-dump bracket 8 is used to prevent the evaporator equipment 6 from tipping over. To ensure the load-bearing requirements of the sliding platform, an L-shaped notch is cut into the steel beam where the support frame 1 meets the concrete beam of the sintering chamber (i.e., the 400H-shaped steel beam is cut into an L-shape, with half of the steel beams on each side overlapping). The support frame 1 is connected to the top of the concrete beam through this L-shaped notch. The sliding platform is a support platform for construction measures. After the construction is completed, it will be protectively dismantled and used in the next sintering system. The equipment is installed in a sliding manner. The top elevation of the sliding platform must be kept horizontal. If there is a height difference, it will affect the sliding of the sliding trolley 5. Be sure to control the elevation when installing the sliding platform.

[0036] Specifically, before constructing the sliding platform, the following steps are performed: dividing the sintering waste heat boiler evaporator assembly area, the hoisting area, and the evaporator sliding area based on on-site construction space conditions and construction time. The site that needs to be leveled (i.e., the evaporator sliding area) is then leveled and compacted. After leveling, a paving base plate 11 (5.5 x 1.3 x 0.14 m) is laid in the evaporator sliding area to prevent the platform from sinking during equipment hoisting onto the sliding platform and preventing the sliding from being completed.

[0037] Step S2: hoist the sliding trolley 5 (ie, the tank) onto the sliding platform, and assemble the evaporator equipment 6 on the ground and hoist it onto the sliding trolley 5 , and the sliding trolley 5 is connected to a hand chain hoist 10 .

[0038] The evaporator unit 6 was heavy and bulky, making it difficult to hoist. Therefore, it was delivered in two sections: an upper section and a lower section. The heaviest unit weighed approximately 22 tons. Therefore, the skid platform needed to be assembled and secured before installation. The evaporator unit 6 was then assembled on the ground and hoisted onto the skid platform.

[0039] Step S3: Cut and remove the flue after the scheduled maintenance shutdown.

[0040] After the scheduled maintenance shutdown, the flue was cut. The flue diameter was 5000mm, and the weld length was 15.7 meters. Cuts were made 200mm east and west from the interface between the flue and the equipment (6.735m for the north side and 5.00m for the south side). A hand chain hoist was used to hold the flue in place during the cuts. First, the pipes for one set of evaporator equipment 6 were cut, the equipment was slid into place, and the taping and welding were completed. Next, the pipes for the adjacent evaporator installation were cut. The cut pipes were hoisted onto a nearby sliding platform, broken into smaller pieces, and then hoisted to the ground for transport to avoid obstructing equipment installation at the site. Before dismantling the pipes, the sliding platform was installed, one set of evaporator equipment 6 was hoisted onto the platform, and the skid trolley 5 (a tank-type vehicle) and a 10-ton hand chain hoist 10 were prepared.

[0041] Step S4: After the flue is cut and removed, install the support beams for the evaporator equipment 6 at the flue cut location according to the sintering chamber + 7,000m platform modification plan. During installation, strictly control the vertical and horizontal spacing and elevation, as well as the requirements for the reinforcement joints between the steel and concrete beams, to prevent deviations that could affect equipment slippage and installation. The support beams consist of a crossbeam 3 and a sliding beam 4 connected to crossbeam 3. The upper flange of sliding beam 4 is beveled and welded to crossbeam 3. The web of sliding beam 4 is welded to the web of crossbeam 3 on three sides.

[0042] Step S5: A limit piece is set on the sliding platform, and the limit piece is located on both sides of the wheels of the sliding trolley 5 to serve as a limit for the left and right directions of the sliding route on the sliding platform to prevent the sliding trolley 5 from positional displacement during the translation process, and after welding a supporting bracket 7 on each side of the evaporator device 6, the sliding trolley 5 is driven by a hand winch 10 to slide until the evaporator device 6 slides into place; wherein, when the sliding trolley 5 deviates, a jack is used to lift the evaporator device 6 from the supporting bracket 7 to adjust the direction of the sliding trolley 5; the width of the tank car is 340mm, and the limit piece is made of 50*6 angle steel, which is fixed to the platform plate 2 of the sliding platform by welding. The left and right distance between the bottom of the wheel of the translation trolley 5 and the limit piece is controlled at about 10-20mm. If there is any displacement during the sliding process, a jack is used to support and correct the tank car in time.

[0043] The reason for welding a supporting bracket 7 around the evaporator equipment 6 is to facilitate the correction of the tank wheels during the sliding of the equipment and the removal of the tank and the dismantling of the platform plate 2 after the evaporator equipment 6 is installed in place. The size of the supporting bracket 7 is 300*300*10*15, and the weld height of the fillet weld is not less than 10mm.

[0044] When the equipment is sliding, both 10t chain hoists 10 must be pulled simultaneously (the chain hoists 10 are fixed to the B-axis main beam). Before sliding, the direction of the sliding trolley 5 should be corrected, and the two sliding tracks should be checked for parallelism. During sliding operations, a dedicated person must be assigned to direct the operation. If the sliding trolley 5 deviates, the equipment must be lifted with a jack in a timely manner, the pulley direction must be adjusted, and the equipment must be accurately slid into place.

[0045] During the sliding, a person stands on the concrete beam of the sintering chamber and operates the hand chain hoist 10 to slowly pull until the evaporator device 6 slides into place.

[0046] Step S6: Use a jack to prop up the evaporator 6 at the support bracket 7 to remove the sliding trolley 5. After installing the rolling guide rails at the bottom of the evaporator 6, use a jack to place the evaporator 6 on the rolling guide rails. After the evaporator 6 is adjusted into position, the pipes at both ends of the evaporator 6 are welded to the evaporator 6 using a tape welding method. Specifically, use a 20t jack to prop up the evaporator 6, remove the sliding trolley, and then install the rolling guide rails at the bottom of the device. Finally, slowly lower the jack to seat the device on the rolling guide rails. After the evaporator 6 is adjusted into position, the pipes at both ends of the evaporator 6 are welded to the evaporator 6 using a tape welding method with a tape size of 250*12mm.

[0047] Step S7: Remove the sliding platform. Specifically, after the evaporator equipment 6 is installed, remove the sliding platform and paint the equipment and pipeline welds for corrosion protection. According to the equipment installation requirements, check again to see if there are any missing parts. After passing the acceptance inspection, the equipment can be delivered to the owner for production.

[0048] Those skilled in the art should understand that they can implement variations by combining the prior art with the above embodiments, which will not be described in detail here. Such variations do not affect the essence of the present invention and will not be described in detail here.

[0049] The above describes the preferred embodiments of the present invention. It should be understood that the present invention is not limited to the above-mentioned specific embodiments, and the devices and structures that are not described in detail should be understood to be implemented in a common manner in the art; any technician familiar with the art can use the above-mentioned disclosed methods and technical contents to make many possible changes and modifications to the technical solutions of the present invention without departing from the scope of the technical solutions of the present invention, or modify them into equivalent embodiments of equivalent changes, which does not affect the essential content of the present invention. Therefore, any simple modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention that do not depart from the content of the technical solutions of the present invention are still within the scope of protection of the technical solutions of the present invention.

Claims

1. A sliding installation method for sintering waste heat boiler evaporator equipment, characterized in that: The steps include: Step S1: constructing a sliding platform on each side of the sintering chamber, wherein the sliding platform includes a support frame and a platform plate located on the support frame; Step S2: hoisting the skid trolley onto the skid platform, and assembling the evaporator equipment on the ground and hoisting it onto the skid trolley, wherein the skid trolley is connected to a hand chain hoist; Step S3: cutting and dismantling the flue after the scheduled maintenance shutdown; Step S4: installing a support beam of the evaporator device at the flue cutting position, wherein the support beam comprises a crossbeam and a sliding beam connected to the crossbeam, and the upper flange of the sliding beam is beveled and welded to the crossbeam; Step S5: After setting a limiter on the sliding platform and welding a supporting bracket on each side of the evaporator equipment, the sliding trolley is driven by a hand chain hoist to slide until the evaporator equipment slides into place; Among them, when the sliding trolley deviates, the evaporator equipment is lifted up from the supporting bracket by a jack to adjust the movement direction of the sliding trolley; Step S6: Using a jack to support the evaporator device at the supporting bracket to remove the sliding trolley, and after installing the rolling guide rail at the bottom of the evaporator device in place, using a jack to place the evaporator device on the rolling guide rail, and after the evaporator device is adjusted into place, using a wrapping welding method to weld the pipes at both ends of the evaporator device to the evaporator device; Step S7: dismantling the sliding platform.

2. The sliding installation method of the sintering waste heat boiler evaporator equipment according to claim 1, characterized in that: Before performing step S1, the method further includes: Divide the evaporator equipment into an assembly area, a hoisting area, and an evaporator sliding area, and after leveling and compacting the site in the evaporator sliding area, pave the base plate in the evaporator sliding area.

3. The sliding installation method of the sintering waste heat boiler evaporator equipment according to claim 1, characterized in that: The evaporator apparatus includes a superheat evaporator assembly and an evaporator.

4. The sliding installation method of the sintering waste heat boiler evaporator equipment according to claim 1, characterized in that: The skid trolley is a tank vehicle.

5. The sliding installation method of the sintering waste heat boiler evaporator equipment according to claim 1, characterized in that: An L-shaped notch is cut at the intersection of the support frame and the concrete beam of the sintering chamber, and the support frame is overlapped on the top of the concrete beam through the L-shaped notch.

6. The sliding installation method of the sintering waste heat boiler evaporator equipment according to claim 1, characterized in that: The web of the sliding beam is pressed against the web of the cross beam and is welded to the web of the cross beam on three sides.

7. The sliding installation method of the sintering waste heat boiler evaporator equipment according to claim 1, characterized in that: In step S3, when the flue is cut, a hand hoist is used to hang the flue.

8. The sliding installation method of the sintering waste heat boiler evaporator equipment according to claim 1, characterized in that: The platform plate is a steel plate.

9. The sliding installation method of the sintering waste heat boiler evaporator equipment according to claim 1, characterized in that: In step S5, the limiting member is an angle steel, and the limiting member is welded and fixed on the platform plate.

10. The sliding installation method of the sintering waste heat boiler evaporator equipment according to claim 1, characterized in that: The sliding trolley is connected to two 10t hand chain hoists.

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