Hoisting construction method of elevated torch facility

Abstract

The invention relates to a hoisting construction method of an elevated torch facility, the elevated torch facility comprises a tower and a barrel, and the barrel comprises a high-pressure torch barrel and an ammonia torch barrel; and the high-pressure torch barrel and the ammonia torch barrel share one tower. The method comprises the following steps: dividing a tower into 15 tower sections, and firstly, carrying out bulk packing of the first to third sections of tower at the bottom and pre-assembling of the fourth to fifteenth sections of tower; the high-pressure torch barrel and the ammonia torch barrel are each divided into six barrel sections. After one to three tower sections are in bulk, the first to the second barrel sections are installed, then hoisting is carried out alternately according to the sequence that every two to three tower sections are hoisted, and then one barrel section is hoisted, and field assembly is carried out; and after the torch tower frame and each section of the cylinder body are assembled on site, a torch head is mounted. According to the invention, ground scattered assembly and concentrated hoisting are adopted, and hoisting work is carried out in a manner that the tower and the barrel are crossed in sequence from low to high. And meanwhile, the actual site space requirement is considered, the hoisting sequence is reasonably arranged, the construction efficiency is high, the construction period is shortened, and the construction safety is good.

Description

Technical Field

[0001] The invention relates to the technical field of chemical equipment installation, and in particular to a hoisting construction method for an elevated flare facility. Background Art

[0002] Elevated flare facilities are a common exhaust gas combustion treatment facility in the petrochemical, coal chemical and fine chemical industries. There are many types, including single-tube upright, lattice frame, tripod, attached frame, etc. The lifting methods include overall lifting, double-machine lifting, single-machine lifting, bulk, etc.

[0003] The flare tower frame involved in the present invention is a triangular pyramid body, and the cylinder body includes a high-pressure flare cylinder body and an ammonia flare cylinder body; the high-pressure flare cylinder body and the ammonia flare cylinder body share a tower frame, and it is difficult to set the hanging point, the tower frame is high, and it is difficult to assemble in the air. After the tower frame is inserted into the flare cylinder body, the center of gravity and the centroid are on different axes. After the tower frame is erected, it is difficult to control the overall level of the bottom of the three main limbs, and it is difficult to position and assemble in the air, resulting in low construction efficiency and poor construction safety. Summary of the invention

[0004] The technical problem to be solved by the present invention is to provide a method for hoisting and constructing an elevated flare facility, so as to achieve the purpose of improving construction efficiency and safety.

[0005] In order to solve the above technical problems, the technical solution adopted by the present invention is: A method for hoisting and constructing an elevated flare facility, wherein the elevated flare facility comprises a tower and a barrel, wherein the barrel comprises a high-pressure flare barrel and an ammonia flare barrel; the high-pressure flare barrel and the ammonia flare barrel share a tower; the method comprises the following steps: Step 1: The tower is divided into 15 tower sections. First, the 1st to 3rd tower sections at the bottom are assembled in bulk and the 4th to 15th tower sections are preassembled. Step 2, the high-pressure flare barrel and the ammonia flare barrel are each divided into 6 barrel segments; After the 1st to 3rd tower sections are assembled in bulk, the 1st and 2nd cylinder sections are installed, and then the 2nd and 3rd tower sections are hoisted, followed by 1 cylinder section, and then the sections are hoisted alternately and assembled on site; Step 3: After the on-site assembly of the flare tower and the cylinder sections is completed, install the flare head.

[0006] As a preferred embodiment, in step 1, the tower segments are assembled vertically in sections on the ground, and two 50t truck cranes are used to assemble the rods of the 4th to 15th tower segments into a whole on the ground.

[0007] As a preferred implementation, in step 2, a double-machine lifting and delivery method is adopted for hoisting the flare tower and each segment of the cylinder. One crane is the main crane hoisting the upper part of the equipment, and the other crane is the tail crane hoisting the lower part of the equipment. The two cranes first lift each tower segment and the cylinder segment, the main crane is responsible for lifting the equipment, and the tail crane is responsible for delivery, gradually transitioning the tower segment and the cylinder segment from a horizontal state to a vertical state. After the equipment reaches an upright state, the tail crane unhooks, the main crane rotates, and then assembles the tower and the cylinder together, aligns them, fixes them, unhooks, and completes the hoisting work.

[0008] As a preferred implementation, in step 2, the hoisting is performed in the following order: (1) Sections 1-3 of the tower in bulk, (2) Sections 1-2 of the high-pressure flare barrel and sections 1-2 of the ammonia flare barrel, (3) Sections 4-7 of the flare tower, (4) Section 3 of the high-pressure flare barrel, (5) Section 3 of the ammonia flare barrel, (6) Sections 8-9 of the flare tower, (7) Platform at 74 meters in height, (8) Section 4 of the high-pressure flare barrel, (9) Section 4 of the ammonia flare barrel, (10) Flare Sections 10 to 12 of the tower, (11) Section 5 of the high-pressure flare barrel, (12) Section 5 of the ammonia flare barrel, (13) Sections 13 to 15 of the flare tower, (14) Platforms at 104 and 110 meters in elevation, (15) Section 6 of the high-pressure flare barrel, (16) Section 6 of the ammonia flare barrel, (17) Platform at 115 meters in elevation, (18) High-pressure flare head, (19) Ammonia flare head.

[0009] As a preferred embodiment, in step 2, the high-pressure flare barrel and the ammonia flare barrel are fixed in the middle of the tower, and the flare barrel sections are butt-welded.

[0010] As a preferred implementation, in step three, the flare head and the flare barrel outlet flange are connected using bolts.

[0011] As a preferred embodiment, the steel tower is in the shape of a triangular pyramid, with a bottom span of 22m, a top span of 7.5m, a tower height of 110m, a total tower weight of 149 tons, and the main structure columns and beams are made of seamless steel pipes. The main limbs are connected with flange bolts, and the columns, beams and diagonal braces are connected with connecting plates.

[0012] The present invention adopts segmented assembly and hoisting, and the flare tower is divided into 15 sections, the high-pressure flare barrel is divided into 6 sections, and the ammonia flare barrel is divided into 6 sections, for a total of 27 sections. The ground is dispersedly assembled and hoisted in a centralized manner, and the tower and the barrel are hoisted alternately from low to high. At the same time, the requirements of the actual on-site space are considered, and the hoisting sequence is reasonably arranged, so that the construction efficiency is high, the construction period is shortened, and the construction safety is good. DETAILED DESCRIPTION

[0013] This embodiment takes the installation project of four elevated flare facilities in the bidding section of the 500,000 tons / year coal tar full fraction hydrogenation to produce cycloalkane oil project of Shaanxi Shenmu Fuyou Energy Technology Co., Ltd. as an example.

[0014] In this embodiment, the elevated flare facility includes a tower and a barrel, wherein the barrel includes a high-pressure flare barrel and an ammonia flare barrel. The high-pressure flare barrel and the ammonia flare barrel share a tower, the steel tower is in the shape of a triangular pyramid, the bottom span is 22m, the top is 7.5m, the tower height is 110m, the total weight of the tower is 149 tons, the main structure columns and beams are all made of seamless steel pipes, the main limbs are connected with flange bolts, the columns, beams and diagonal braces are connected with connecting plates, two flare barrels, namely the high-pressure flare barrel and the ammonia flare barrel, are fixed in the middle of the tower, the flare head and the flare barrel outlet flange are connected with bolts, and the flare barrel is butt-welded at the sections.

[0015] The flare tower and barrel arrive in bulk and need to be assembled into modules on the ground. The tower is assembled vertically in sections on the ground, and then hoisted in 15 sections in the air. First, two 50t truck cranes are used to assemble the 33.5-110m tower rods into a whole on the ground, and then hoisted in sections by a 450t crawler crane. The high-pressure flare barrel is divided into 6 sections, and the ammonia flare barrel is divided into 6 sections, for a total of 27 sections. Table 1 shows the segmentation of the flare barrel, and Table 2 shows the segmentation of the flare tower. From low to high, the tower and the barrel are hoisted crosswise. The flare head is installed separately.

[0016] Table 1 Flare barrel section weight

[0017] Table 2 Flare stack section weight

[0018] 1. Foundation treatment of lifting site The equipment hoisting site includes the hoisting operation area, the crane travel route site and the crane assembly site. According to the geological exploration results and the crane ground pressure requirements, if the crane station requirements cannot be met, special foundation treatment must be carried out. The foundation treatment mainly adopts the replacement cushion method. For some sites with lower elevation, the padding method is used for treatment.

[0019] For the formal roads that have not yet been constructed in the device area, only the roadbed construction will be carried out before the transportation and lifting of large equipment are completed, and the cement pavement will not be constructed for the time being; the formal roads that have been completed in the device area will be used by large transport vehicles and cranes after the maintenance period and special protection. The protection measures are as follows: pave the formal road surface with a thickness of more than 50mm, and pave the roadbed or 30mm or thick steel plate after compaction, and remove it after the lifting is completed. For the informal road surface in the lifting area: The informal road surface in the lifting area near the torch facility is treated by the replacement cushion method, with gravel backfill of about 500mm thick, rolling and compaction, and the compaction coefficient is not less than 0.95, and finally the roadbed is pave to further enhance the ground endurance.

[0020] The order of hoisting the flare tower, cylinder, lifting device and flare head First, the bottom 1-3 tower sections are assembled in bulk and the 4-15 tower sections are pre-assembled.

[0021] The tower segments are assembled vertically on the ground, and two 50t truck cranes are used to assemble the rods of the 4th to 15th tower segments into a whole on the ground.

[0022] 2. After the 1st to 3rd tower sections are assembled in bulk, the 1st and 2nd cylinder sections are installed, and then they are hoisted alternately and assembled on site in the order of hoisting 2-3 tower sections and then hoisting 1 cylinder section.

[0023] The lifting process adopts the single-machine installation method, and the main crane is a Demg CC2500 450t crawler crane. The specific lifting sequence is as follows: (1) Bulk loading of tower sections 1-3, (2) High-pressure flare barrel sections 1-2, ammonia flare barrel sections 1-2, (3) Flare tower sections 4-7, (4) High-pressure flare barrel section 3, (5) Ammonia flare barrel section 3, (6) Flare tower sections 8-9, (7) 74-meter-high platform, (8) High-pressure flare barrel section 4, (9) Ammonia flare barrel section 5 Section 4, (10) Sections 10-12 of the flare stack, (11) Section 5 of the high-pressure flare barrel, (12) Section 5 of the ammonia flare barrel, (13) Sections 13-15 of the flare stack, (14) Platforms at 104 and 110 meters in elevation, (15) Section 6 of the high-pressure flare barrel, (16) Section 6 of the ammonia flare barrel, (17) Platform at 115 meters in elevation, (18) High-pressure flare head, (19) Ammonia flare head.

[0024] 3. After the on-site assembly of the flare tower and the cylinder sections is completed, install the flare head.

[0025] In this embodiment, the large-scale lifting equipment includes one Demag CC2500 450-ton crawler crane, two Zoomlion 50-ton cranes, and two Zoomlion 25-ton truck cranes.

[0026] The 1st to 3rd sections of the flare stack were installed in bulk, mainly using Zoomlion’s 50t truck crane.

[0027] The 4th to 12th sections of the flare stack, the 1st to 4th sections of the high-pressure flare barrel, and the 1st to 4th sections of the ammonia flare barrel were installed using the main crane: Demag CC2500 450-ton crawler crane, using SH / LH working conditions, the body weight is 607 tons: 102m main boom, 38m operating radius; tail crane: Zoomlion 50t truck crane, using working conditions: 16m main boom, 12m operating radius;

[0028] The 13th to 15th sections of the flare tower, the 5th to 6th sections of the high-pressure flare barrel, the 5th to 6th sections of the ammonia flare barrel, the high-pressure flare head, and the ammonia flare head were installed using the main crane: Demag CC2500 450-ton crawler crane, using SWSL working conditions, with a body weight of 607 tons: 72m main boom, 78m auxiliary boom, 55m operating radius, and 60-ton counterweight for superlifting. Tail crane: Zoomlion 50t truck crane, using working conditions: 24.6m main boom, 12m operating radius; for installation work.

[0029] When hoisting the flare tower and the cylinder segments, a double-machine lifting and delivery method is adopted. One crane is the main crane to lift the upper part of the equipment, and the other crane is the tail crane to lift the lower part of the equipment. The two cranes first lift the tower segments and the cylinder segments. The main crane is responsible for lifting the equipment, and the tail crane is responsible for delivery, gradually transitioning the tower segments and the cylinder segments from a horizontal state to a vertical state. After the equipment reaches the upright state, the tail crane unhooks, the main crane rotates, and then assembles the tower and the cylinder together. After alignment, fix it, unhook it, and complete the hoisting work.

Claims

1. A method for hoisting and constructing an elevated flare facility, the elevated flare facility comprising a tower and a cylinder, wherein: The barrel comprises a high-pressure flare barrel and an ammonia flare barrel; the high-pressure flare barrel and the ammonia flare barrel share a tower, and is characterized in that it comprises the steps of: Step 1: The tower is divided into 15 tower sections. First, the 1st to 3rd tower sections at the bottom are assembled in bulk and the 4th to 15th tower sections are preassembled. Step 2, the high-pressure flare barrel and the ammonia flare barrel are each divided into 6 barrel segments; After the 1st to 3rd tower sections are assembled in bulk, the 1st and 2nd cylinder sections are installed, and then the 2nd and 3rd tower sections are hoisted, followed by 1 cylinder section, and then the sections are hoisted alternately and assembled on site; Step 3: After the on-site assembly of the flare tower and the cylinder sections is completed, install the flare head.

2. The method according to claim 1, characterized in that: In step one, the tower segments are assembled vertically on the ground in sections, and two 50t truck cranes are used to assemble the rods of the 4th to 15th tower segments into a whole on the ground.

3. The method according to claim 1 or 2, characterized in that: In step two, the double-machine lifting and delivery method is adopted for hoisting the flare tower and the cylinder segments. One crane is the main crane to lift the upper part of the equipment, and the other crane is the tail crane to lift the lower part of the equipment. The two cranes first lift the tower segments and the cylinder segments. The main crane is responsible for lifting the equipment, and the tail crane is responsible for delivery. The tower segments and the cylinder segments are gradually transitioned from a horizontal state to a vertical state. After the equipment reaches an upright state, the tail crane unhooks, the main crane rotates, and then the tower and the cylinder are assembled together. After alignment, they are fixed and unhooked to complete the hoisting work.

4. The method according to claim 3, characterized in that: In step 2, install in the following order: (1) Sections 1-3 of the tower in bulk, (2) Sections 1-2 of the high-pressure flare barrel and sections 1-2 of the ammonia flare barrel, (3) Sections 4-7 of the flare tower, (4) Section 3 of the high-pressure flare barrel, (5) Section 3 of the ammonia flare barrel, (6) Sections 8-9 of the flare tower, (7) Platform at 74 meters in height, (8) Section 4 of the high-pressure flare barrel, (9) Section 4 of the ammonia flare barrel, (10) Flare Sections 10 to 12 of the tower, (11) Section 5 of the high-pressure flare barrel, (12) Section 5 of the ammonia flare barrel, (13) Sections 13 to 15 of the flare tower, (14) Platforms at 104 and 110 meters in elevation, (15) Section 6 of the high-pressure flare barrel, (16) Section 6 of the ammonia flare barrel, (17) Platform at 115 meters in elevation, (18) High-pressure flare head, (19) Ammonia flare head.

5. The method according to claim 4, characterized in that: In step 2, the high-pressure flare barrel and the ammonia flare barrel are fixed in the middle of the tower, and the flare barrel sections are butt-welded.

6. The method according to claim 1 or 5, characterized in that: In step three, the flare head and the flare barrel outlet flange are connected using bolts.

7. The method according to claim 6, characterized in that: The steel tower is in the shape of a triangular pyramid, with a bottom span of 22m, a top span of 7.5m, a tower height of 110m, and a total tower weight of 149 tons. The main structure columns and beams are made of seamless steel pipes, the main limbs are connected with flange bolts, and the columns, beams and diagonal braces are connected with connecting plates.

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