CN115009976A - Aluminum oxide evaporator heat exchange header lifting appliance and vertical lifting method thereof - Google Patents

Abstract

The invention belongs to the technical field of equipment installation, and particularly relates to an aluminum oxide evaporator heat exchange collector pipe lifting appliance and a vertical lifting method thereof, wherein the aluminum oxide evaporator heat exchange collector pipe lifting appliance comprises a screw rod part, a lifting ring part and a screw sleeve part, the bottom of the screw sleeve part is provided with an opening, the inner wall of the opening is provided with 2, 4 or 6 wedge-shaped bodies, the outer wall of the opening is a supporting and expanding part, the lifting ring part is fixedly arranged at the top of a hexagon head of the screw rod part, the rod end of the screw rod part is connected with a screw thread section in the screw sleeve part in a threaded matching manner, the top of the screw sleeve part is provided with an operating part, and the inclination of the wedge-shaped bodies is 2-5 mm/100 mm. The invention has the beneficial effects that: 1) the invention can use the truck crane to cooperate with the special lifting appliance to vertically penetrate the pipe in the air after the heating chamber of the evaporator is installed in place, and the whole operation process is convenient and fast. 2) The special lifting appliance has the advantages of simple and compact structure, convenient assembly and disassembly, safety and reliability in the use process, and remarkable improvement on the operation rate of the vertical pipe lifting in the construction site.

Description

A kind of alumina evaporator heat exchange header hanger and vertical hoisting method thereof

technical field

The invention belongs to the technical field of equipment installation, and in particular relates to an alumina evaporator heat exchange header hanger and a vertical hoisting method thereof.

Background technique

Tubular falling film evaporators (see Figure 1) are widely used in the alumina industry and are usually composed of three parts: a tube box cap (1), a heating chamber (2), and a separation chamber (3). Heat exchange headers (4), so most of the weight of the evaporator is concentrated in the heating chamber. The heat exchange header is a key part of the tubular falling film evaporator, and it needs to pass through four layers of fixed partitions (5) and be fixed by means of expanding tubes. Taking the evaporation workshop of an alumina company with an annual output of 1 million tons of alumina as an example, it has a total of six-effect evaporators. One-third of the heat headers are installed in the manufacturing plant, and the rest are installed at the construction site. A total of about 3,100 heat headers need to be installed at the construction site. The specification of the heat exchange header is Φ57×5 seamless steel pipe with a length of 12 meters. The heating chamber of the evaporator is placed flat on the ground before hoisting. Since the header is 12 meters long, it has a large deflection under its own gravity, and it is difficult to pass through the four-layer fixed partition in a horizontal state. , it will cause the weight of the evaporator heating chamber to be too large, making it difficult to hoist the heating chamber.

SUMMARY OF THE INVENTION

The purpose of the present invention is to provide an alumina evaporator heat exchange header hanger and its vertical hoisting method, which overcomes the deficiencies of the prior art. The vertical pipe penetration not only ensures that the hoisted heat exchange header is inserted vertically into the evaporator heating chamber, but also enables the heat exchange header to be quickly separated from the car hoist, and also ensures that it will not fall off during the hoisting process, and the entire operation process is convenient. fast.

To achieve the above object, the present invention is achieved through the following technical solutions:

One technical solution: an alumina evaporator heat exchange header hanger, characterized in that it includes a screw part, a lifting ring part and a screw sleeve part, the bottom of the screw sleeve part is open, and the inner wall of the opening is provided with two places , 4 or 6 wedge-shaped bodies, the outer wall of the opening is the expansion part, the lifting ring part is fixed on the top of the hexagonal head of the screw part, the rod end of the screw part and the threaded section in the screw sleeve part are connected by thread matching, and the screw sleeve part is connected by thread matching. There is an operation part on the top of the wedge, and the inclination of the wedge is 2~5mm/100mm.

Further, the opening is uniformly distributed with 2-6 incisions on the bottom circumference of the screw sleeve part, the depth of the incision is 70-100mm, the width of the incision is 3-6mm, and the inner wall of the screw sleeve part where the opening is located has no thread.

Further, the depth of the incision accounts for 50-70% of the length of the screw sleeve portion.

Further, the thread specification between the screw part and the screw sleeve part is M30 or more, and the thread pitch is any one of 3 mm, 2 mm, 1.5 mm, 1 mm, and 0.75 mm.

Further, the bottom of the screw portion is provided with a polished rod section with a length of 15-25 mm, and the bottom end of the polished rod section is provided with a 6-12*60° chamfer.

Further, the wedge-shaped body is connected with the inner wall of the threaded sleeve portion by full welding, or is connected by a full welding connection and a pin.

The second technical solution: a vertical hoisting method for the heat exchange header of an alumina evaporator, characterized in that the specific operations are as follows:

1) Lightly connect the screw part of the spreader with the screw sleeve part, and the expansion part does not expand;

2) Select a spreader of suitable size, so that after the screw sleeve is inserted into the heat exchange header, the gap at the joint is not more than 3mm;

3) Fix the hexagonal head of the screw part, and rotate the operation part with a wrench. During the tightening process, make the rod end of the screw part expand outward against the wedge body, and the expansion part expands outward and is in close contact with the inner wall of the heat exchange header. , fully press, and use the friction force to connect the spreader and the heat exchange header together;

4) After the spreader and the heat exchange header are locked, do a 1-ton pull test on the pull-test fixture. After the tension gauge shows that the pull force reaches 1 ton, keep the pull force for 20 minutes, and the spreader does not come out, which is regarded as qualified;

5) Hook the hoisting tool with the hook of the car hoist, pull up the heat exchange header vertically, and insert it into the fixed partition from top to bottom;

6) Repeat steps 1-5. After all the heat exchange headers are in place, the subsequent tube expansion work can be carried out.

Further, the test pull inspection tool is a horizontal structure, including a frame, a stretching hydraulic cylinder, a pipe body fixing fixture, a tension sensor and a controller. The stretching hydraulic cylinder is arranged at one end of the frame, and the stretching hydraulic cylinder is controlled by The valve and pipeline are connected with the hydraulic station, and the hydraulic station, control valve and tension sensor are connected with the controller through cables.

Compared with the prior art, the beneficial effects of the present invention are:

1) In the present invention, after the evaporator heating chamber is installed in place, a car hoist and a special hanger can be used to carry out vertical pipe penetration in the air, which can not only ensure that the suspended pipe is vertically inserted into the evaporator heating chamber, but also enable the heat exchange header to It can be quickly separated from the car crane, and it can also ensure that it will not fall off during the hoisting process, and the whole operation process is convenient and fast. 2) The special spreader is simple and compact in structure, easy to find materials, easy to install and disassemble, safe and reliable during use, can achieve rapid lifting, and can be quickly disassembled after the end for the next operation, which significantly improves the operation rate of vertical pipe hanging on the construction site.

Description of drawings

1 is a schematic structural diagram of a tubular falling film evaporator in the prior art;

Fig. 2 is the structural schematic diagram of the embodiment of the spreader of the present invention;

Fig. 3 is A-direction view in Fig. 2;

4 is a schematic diagram of the installation state of the heat exchange header according to the embodiment of the present invention;

FIG. 5 is a schematic diagram of a test state of a pull test tool according to an embodiment of the present invention.

In the figure: 1-tube box cap, 2-heating chamber, 3-separation chamber, 4-heat exchange header, 5-fixed baffle, 6-screw part, 7-hoisting ring part, 8-screw sleeve part, 9- Wedge-shaped body, 10-expansion part, 11-operation part, 12-cut, 13-spreader, 14-frame, 15-stretching hydraulic cylinder, 16-tube fixing fixture, 17-tension sensor, 18-control , 19-hydraulic station.

Detailed ways

The embodiments of the present invention will be further described below with reference to the embodiments and the accompanying drawings. Although the drawings show exemplary embodiments of the present disclosure, it should be understood that the present disclosure can be implemented in various forms and should not be implemented as set forth herein. method is restricted. Rather, these embodiments are provided so that the present disclosure will be more thoroughly understood, and will fully convey the scope of the present disclosure to those skilled in the art.

2-3 is a schematic structural diagram of an embodiment of an alumina evaporator heat exchange header hanger according to the present invention, including a screw part 6, a lifting ring part 7 and a screw sleeve part 8, the bottom of the screw sleeve part 8 is open, and the opening is The inner wall is provided with 4 wedge-shaped bodies 9, the outer wall of the opening is the expansion part 10, the lifting ring part 7 is fixed on the top of the hexagonal head of the screw part 6, the rod end of the screw part 6 passes through the thread section in the screw sleeve part 8 Thread matching connection, the top of the screw sleeve part 8 is provided with an operating part 11, and the inclination of the wedge body 9 is 3mm/100mm.

The opening is evenly distributed with 4 incisions 12 on the bottom circumference of the screw sleeve part 8, the depth of the incision 12 is 75mm, the width of the incision 12 is 5mm, and the inner wall of the screw sleeve part 8 where the opening is located has no thread. The depth of the cutout 12 is 65% of the length of the threaded portion 8 . The thread specification between the screw part 6 and the screw sleeve part 8 is M30, and the thread pitch is a fine thread with a thread pitch of 1.5 mm, which has a self-locking function. The bottom of the screw part 6 is provided with a polished rod section with a length of 20 mm, and the bottom end of the polished rod section is provided with a 10*60° chamfer. The wedge-shaped body 9 is connected with the inner wall of the screw sleeve part 8 by full welding, so as to prevent the external force of the screw part 6 from falling off.

In the embodiment, the specification of the heat exchange header is Φ57×5, and its inner diameter is Φ47, so the outer diameter of the expansion part 10 of the spreader is Φ45. The operation part 11 can be replaced by a M30 high-strength nut, the screw part 6 is matched with an M30 high-strength bolt, and the top center of the hexagonal head of the screw part 6 is welded with an M30 washer as the lifting ring part 7 .

See Fig. 4, the vertical hoisting method of the alumina evaporator heat exchange header of the present invention, the concrete operation is as follows:

1) Lightly connect the screw part 6 of the spreader 13 and the screw sleeve part 8, and the expansion part 10 is not expanded;

2) Select a hanger of suitable size, so that after the screw sleeve part 8 is inserted into the heat exchange header, the gap at the joint is not more than 3mm;

3) Fix the hexagonal head of the screw part 6, and rotate the operation part 11 with a wrench. During the tightening process, the rod end of the screw part 6 is expanded outward against the wedge-shaped body 9, and the expansion part 10 is expanded outward to exchange heat. The inner wall of the header is in close contact, fully compressed, and the sling 13 is connected with the heat exchange header 4 by the friction force;

4) After the spreader 13 is locked with the heat exchange header 4, do a 1 ton pull test on the pull test fixture. After the tensile force meter shows that the pulling force reaches 1 ton, keep the pulling force for 20 minutes, and the spreader 13 does not come out. is qualified;

5) Hook the hanger 13 with the hook of the truck crane, pull up the heat exchange header 4 vertically, and insert it into the fixed partition 5 from top to bottom;

6) Repeat steps 1-5 until all the heat exchange headers are in place, and then the subsequent tube expansion work can be carried out. Practice has proved that the spreader of the present invention is safe and efficient during use, and improves the production operation rate.

As shown in Figure 5, the tensile test fixture is a horizontal structure, including a frame 14, a stretching hydraulic cylinder 15, a pipe body fixing fixture 16, a tension sensor 17 and a controller 18. The stretching hydraulic cylinder is located at one end of the frame, and the stretching The hydraulic cylinder is connected with the hydraulic station 19 through the control valve and pipeline, and the hydraulic station 19, the control valve and the tension sensor 17 are connected with the controller 18 through the cable. Before the test, place the heat exchange header 4 on the frame 14, fix it with the tube body fixing fixture 16, start the stretching hydraulic cylinder 15, so that the pulling force on the tension sensor 17 is displayed as 1 ton, and the controller 18 controls the stretching hydraulic cylinder. 15 Keep the tension for 20 minutes, at this time the spreader 13 does not come out, it is considered as qualified.

The above embodiments are only specific examples selected for the purpose, technical solutions and beneficial effects of the present invention, but should not limit the protection scope of the present invention. Various modifications, equivalent replacements and improvements should fall within the protection scope of the present invention.

Claims (8)

1. an alumina evaporator heat exchange header hanger is characterized in that, comprises screw part, lifting ring part and screw sleeve part, the bottom of described screw sleeve part is open, and the inner wall of opening is provided with 2 places, 4 places Or 6 wedge-shaped bodies, the outer wall of the opening is the expansion part, the lifting ring part is fixed on the top of the hexagonal head of the screw part, the rod end of the screw part and the threaded section in the screw sleeve part are connected by thread matching, and the top of the screw sleeve part is set. There is an operation part, and the inclination of the wedge body is 2~5mm/100mm. 2. A kind of alumina evaporator heat exchange header hanger according to claim 1, characterized in that, the opening is evenly distributed with 2 to 6 incisions on the circumference of the bottom of the screw sleeve portion, and the depth of the incision is 70-100mm, the width of the incision is 3-6mm, and the inner wall of the screw sleeve part where the opening is located has no thread. 3 . The alumina evaporator heat exchange header hanger according to claim 2 , wherein the depth of the incision accounts for 50-70% of the length of the screw sleeve portion. 4 . 4. The alumina evaporator heat exchange header hanger according to claim 1, wherein the thread specification between the screw part and the screw sleeve part is M30 or more, and the thread pitch is 3mm, Any of 2mm, 1.5mm, 1mm, and 0.75mm. 5. The alumina evaporator heat exchange header hanger according to claim 1, wherein the bottom of the screw part is provided with a polished rod section with a length of 15-25mm, and the bottom end of the polished rod section is provided with a 6- 12*60°Chamfer. 6 . The alumina evaporator heat exchange header hanger according to claim 1 , wherein the wedge body and the inner wall of the threaded sleeve are connected by full welding, or are connected by all welding and pins. 7 . 7. A vertical hoisting method for an alumina evaporator heat exchange header, characterized in that the specific operations are as follows: 1) Lightly connect the screw part of the spreader with the screw sleeve part, and the expansion part does not expand; 2) Select a spreader of suitable size, so that after the screw sleeve is inserted into the heat exchange header, the gap at the joint is not more than 3mm; 3) Fix the hexagonal head of the screw part, and rotate the operation part with a wrench. During the tightening process, make the rod end of the screw part expand outward against the wedge body, and the expansion part expands outward and is in close contact with the inner wall of the heat exchange header. , fully press, and use the friction force to connect the spreader and the heat exchange header together; 4) After the spreader and the heat exchange header are locked, do a test pull test on the pull test fixture. After the tension gauge shows that the pull force reaches 1 ton, keep the pull force for 20 minutes, and the spreader does not come out, which is regarded as qualified; 5) Hook the hoisting tool with the hook of the car hoist, pull up the heat exchange header vertically, and insert it into the fixed partition from top to bottom; 6) Repeat steps 1-5, when all the heat exchange headers are in place, the subsequent tube expansion work can be carried out. 8 . The vertical hoisting method for the heat exchange header of an alumina evaporator according to claim 7 , wherein the test pulling and checking tool is a horizontal structure, comprising a frame, a stretching hydraulic cylinder, and a pipe body fixing tool. 9 . Fixture, tension sensor and controller, the stretching hydraulic cylinder is located at one end of the frame, the stretching hydraulic cylinder is connected with the hydraulic station through the control valve and pipeline, and the hydraulic station, the control valve and the tension sensor are connected with the controller through the cable .

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