Method for replacing spraying main pipe on top layer of absorption tower

Abstract

The invention provides a method for replacing a spraying main pipe on the top layer of an absorption tower. The method comprises the steps that S1, a moving trolley is arranged below the spraying main pipe; s2, enabling one end of the spraying main pipe to fall on the moving trolley; s3, a first lifting device is arranged to pull the spraying main pipe towards the outside of the tower to a preset length through a lifting rope; s4, arranging a second hoisting device, and hoisting the spraying main pipe out of the absorption tower by communicating the hoisting rope with the second hoisting device; s5, the new spraying main pipe is transversely hoisted to a preset position, one end of the spraying main pipe extends into the tower and falls on the moving trolley, hoisting of the side, corresponding to the moving trolley, of the spraying main pipe is relieved, and the spraying main pipe is pushed to move into the tower; and S6, the spraying main pipe is hoisted, the corresponding connecting pieces are connected with the two ends of the spraying main pipe, and replacement of the spraying main pipe is completed. According to the invention, the problems of how to hoist the spray main pipe out of the tower and how to hoist and reassemble the new spray main pipe are solved, and a new thought is provided for the technical upgrading and reconstruction mode and means of the absorption tower.

Description

Technical Field

[0001] The invention relates to the technical field of absorption tower maintenance, and in particular to a method for replacing a top spray main pipe of an absorption tower. Background Art

[0002] The statements herein merely provide background information related to the present invention and do not necessarily constitute prior art.

[0003] The absorption tower is a commonly used equipment in flue gas desulfurization treatment. The interior of the absorption tower is usually equipped with multiple spray layers distributed up and down. Its main function is to spray slurry from top to bottom to contact with the flue gas for chemical absorption reaction and cool the flue gas to achieve the purpose of ultra-low emissions.

[0004] At present, technical upgrading and transformation of the original equipment has become the main theme, and the transformation and upgrading of the absorption tower is also carried out in a timely manner. In the process of transformation and upgrading of the absorption tower, the spray pipe of the spray layer needs to be replaced. Because there are multiple layers of spray layers, the spray pipe located on the lower layer can use the spray pipe on the upper layer as a traction point and be gradually suspended out of the tower. However, the spray pipe on the top layer is above the demister layer, and the bearing capacity of the end beam of the demister layer is not enough to support the weight of the suspended spray pipe (the spray pipe has a diameter of 1 meter, a length of 14 meters, and weighs about 7.5 tons). Then how to lift the spray pipe on the top layer of the absorption tower out of the tower and how to lift the new spray pipe back for installation has become a major problem we must face. Summary of the invention

[0005] The main purpose of the present invention is to provide a method for replacing the spray main pipe at the top layer of an absorption tower, which can lift the spray main pipe at the top layer of an absorption tower out of the tower and lift a new spray main pipe back for installation.

[0006] To achieve the above object, the technical solution of the present invention is implemented as follows: a method for replacing the top spray main pipe of an absorption tower, comprising:

[0007] S1. A movable trolley capable of moving along the length direction of the spray main pipe is arranged below the spray main pipe;

[0008] S2. Remove the connectors at both ends of the spray pipe and place one end of the spray pipe on a mobile trolley. The mobile trolley moves with the spray pipe while supporting the end of the spray pipe.

[0009] S3, setting a first lifting device, the first lifting device is connected to the end of the spray main pipe away from the mobile trolley from outside the tower through a lifting rope, and pulls the spray main pipe outside the tower to a predetermined length;

[0010] S4, setting a second lifting device, the second lifting device is connected to the spray main pipe extending out of the tower and close to the side of the mobile car from outside the tower through a lifting rope, and then hoisted out of the absorption tower under the joint lifting of the first lifting device and the second lifting device;

[0011] S5. Lift the new spray pipe horizontally to the predetermined position, and extend one end of the spray pipe into the tower and drop it on the moving trolley. Then release the lifting device on the corresponding moving trolley of the spray pipe, and push the spray pipe into the tower until it moves to the predetermined length.

[0012] S6. Lift the sprinkler main pipe by hoisting, and connect the corresponding connectors to both ends of the sprinkler main pipe to complete the replacement of the sprinkler main pipe.

[0013] Furthermore, step S2 includes:

[0014] S21. Install a lifting point A and a lifting point B inside the tower wall, and respectively set two lifting hoists to be connected to the lifting point A and the lifting point B, the other ends of the two lifting hoists are connected to the corresponding two ends of the spray main pipe, and the lifting rope of the lifting hoist at the lifting point B is inclined;

[0015] S22, remove the connectors at both ends of the spray pipe, so that the spray pipe can move along its own length direction, and under the action of two hoists, suspend it in the tower; at this time, determine whether one end of the spray pipe is completely located in the tower and in a suspended state, if so, proceed to step S24, if not, proceed to step S23;

[0016] S23, start the hoisting hoist at the lifting point B, tighten the lifting rope, pull one end of the spray pipe out of the tower, and at the same time, loosen the lifting rope of the hoisting hoist at the lifting point A, and keep the spray pipe in a suspended state until the first end of the spray pipe completely enters the tower and is in a suspended state;

[0017] S24, move the mobile trolley to the bottom of one end of the spray pipe in the tower, start the lifting hoist at the lifting point A, and lower one end of the spray pipe onto the mobile trolley.

[0018] Furthermore, before step S3, the method further includes:

[0019] Start the hoisting hoist at lifting point B, tighten the lifting rope, and pull one end of the sprinkler main pipe out of the tower to a predetermined length.

[0020] Furthermore, in step S3, when the first lifting device pulls the spray main pipe out of the tower, the lifting hoist at the lifting point A is always connected to the end of the spray main pipe to prevent the main pipe from rushing out of the tower.

[0021] Furthermore, in step S5, an electric hoist is provided on the lifting rope on the corresponding side of the mobile trolley on the spray main pipe, and the electric hoist is used to change the length of the lifting rope on this side, adjust the suspension posture of the spray main pipe, and after one end of the spray main pipe is extended into the tower and falls on the mobile trolley, the lifting rope corresponding to this side is always in a relaxed state, thereby releasing the lifting device on the corresponding side of the mobile trolley of the spray main pipe.

[0022] Furthermore, in step S5, the hoisting hoist at the lifting point A is connected to the spray main pipe entering the tower, so as to drive the spray main pipe to move into the tower.

[0023] Furthermore, in step S6, the sprinkler main pipe is hoisted by two hoisting hoists.

[0024] Furthermore, a guide rail is provided at the bottom of the mobile trolley, both ends of the guide rail are connected to the tower body, and the mobile trolley moves on the guide rail. After the replacement of the spray main pipe is completed, the guide rail and the mobile trolley are removed.

[0025] Furthermore, a rotating tray is provided on the top of the moving trolley, and the rotating tray can rotate relative to the moving trolley and support the end of the spray pipe.

[0026] The beneficial effects of the present invention are embodied in:

[0027] The present invention supports one end of the spray pipe by a mobile trolley, and moves with the spray pipe. The other end of the spray pipe is pulled out of the tower by the first lifting device, and then the spray pipe is lifted out of the absorption tower in cooperation with the second lifting device to complete the removal of the spray pipe. When installing a new spray pipe, the new spray pipe is lifted horizontally to a predetermined position, and one end of the spray pipe is extended into the tower and falls on the mobile trolley. After releasing the lifting rope at one end of the spray pipe, the spray pipe is pushed into the tower, and finally the spray pipe is moved to the designated installation position by lifting, and connected to the corresponding connector to complete the replacement of the spray pipe. The present invention solves the problem of how to lift the spray pipe out of the tower and how to lift the new spray pipe back for installation, and provides a new idea for the technical upgrading and transformation of the absorption tower. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In the attached picture:

[0029] Figure 1 It is a position distribution diagram of the replacement method of the top spray main pipe of the absorption tower at the hanging point A and the hanging point B in the present invention;

[0030] Figure 2 This is a state diagram of the first lifting device at the lifting point B in the present invention pulling one end of the spray main pipe out of the tower;

[0031] Figure 3 This is a diagram showing the installation status of the new spray main pipe of the present invention;

[0032] Figure 4 It is a location distribution diagram of the spray main pipe and the absorption tower described in the present invention;

[0033] Figure 5 This is a structural view of the mobile vehicle described in the present invention.

[0034] Description of reference numerals:

[0035] 1. Mobile trolley; 11. Rotating pallet; 2. Lifting hoist; 3. Electric hoist; 4. Guide rail. DETAILED DESCRIPTION

[0036] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. Obviously, the embodiments described are only part of the embodiments of the invention, not all of them. In the absence of conflict, all other embodiments obtained by the personnel of the absorption tower without creative work are within the scope of invention protection.

[0037] See also Figures 1 to 5 .

[0038] The invention discloses a method for replacing a top spray main pipe of an absorption tower, comprising:

[0039] S1. A movable trolley 1 capable of moving along the length direction of the spray main pipe is arranged below the spray main pipe;

[0040] S2. Remove the connectors at both ends of the spray pipe, and place one end of the spray pipe on the mobile trolley 1. The mobile trolley 1 moves with the spray pipe while supporting the end of the spray pipe;

[0041] S3, setting a first lifting device, the first lifting device is connected to the end of the spray main pipe away from the mobile vehicle 1 from outside the tower (the "tower" refers to the "absorption tower", which will not be explained further below) through a lifting rope, and the spray main pipe is pulled outside the tower to a predetermined length;

[0042] S4, setting a second lifting device, the second lifting device is connected to the spray main pipe extending out of the tower and close to the side of the mobile trolley 1 from outside the tower through a lifting rope, and then hoisted out of the absorption tower under the joint lifting of the first lifting device and the second lifting device;

[0043] S5, hoist the new spray pipe horizontally to the predetermined position, and make one end of the spray pipe extend into the tower and fall on the mobile trolley 1, then release the hoisting of the corresponding side of the mobile trolley 1 of the spray pipe, and push the spray pipe into the tower until it moves to the predetermined length;

[0044] S6. Lift the sprinkler main pipe by hoisting, and connect the corresponding connectors to both ends of the sprinkler main pipe to complete the replacement of the sprinkler main pipe.

[0045] In the specific implementation, one end of the spray pipe on the top floor of the absorption tower is supported by the setting of the mobile trolley 1. When the spray pipe moves, it will drive the mobile trolley 1 to move together. The other end of the spray pipe is pulled out of the tower to a predetermined length under the traction of the first lifting device, and then the second lifting device is used to connect with the side of the spray pipe extending out of the tower and close to the mobile trolley 1. Then, under the joint lifting of the first lifting device and the second lifting device, the absorption tower is lifted out to complete the removal of the spray pipe; when installing a new spray pipe, the new spray pipe is lifted horizontally to a predetermined position, and one end of the spray pipe is extended into the tower and falls on the mobile trolley 1; after releasing the lifting rope on one end of the spray pipe, the spray pipe is pushed into the tower, and the spray pipe entering the tower is moved to the designated installation position under the final lifting, and connected to the corresponding connector to complete the replacement of the spray pipe.

[0046] The present invention solves the difficult problems of how to lift the spray main pipe out of the tower and how to lift the new spray main pipe back for installation, and provides a new idea for the technical upgrading and transformation of the absorption tower.

[0047] Preferably, the first lifting device and the second lifting device can be a truck crane or other lifting devices in the prior art.

[0048] In one embodiment, step S2 includes:

[0049] S21, a lifting point A and a lifting point B are installed inside the tower wall at the upper parts of both ends of the spray main pipe, and two lifting hoists 2 are respectively arranged to be connected to the lifting point A and the lifting point B, the other ends of the two lifting hoists 2 are connected to the corresponding two ends of the spray main pipe, and the lifting rope of the lifting hoist 2 at the lifting point B is inclined;

[0050] S22, remove the connectors at both ends of the spray pipe, so that the spray pipe can move along its own length direction, and under the action of the two lifting hoists 2, suspend it in the tower; at this time, determine whether one end of the spray pipe is completely located in the tower and in a suspended state, if so, proceed to step S24, if not, proceed to step S23;

[0051] S23, start the hoisting hoist 2 at the lifting point B, tighten the lifting rope, pull one end of the spray pipe out of the tower, and at the same time, loosen the lifting rope of the hoisting hoist 2 at the lifting point A, and keep the spray pipe in a suspended state until the first end of the spray pipe completely enters the tower and is in a suspended state;

[0052] S24, move the mobile trolley 1 to below one end of the spray pipe in the tower, start the lifting hoist 2 at the lifting point A, and lower one end of the spray pipe onto the mobile trolley 1.

[0053] In a specific implementation, the provision of two lifting hoists 2 can put the spray main pipe in a suspended state, which is convenient for removing the connectors at both ends of the spray main pipe. At the same time, by tilting one of the lifting ropes, the spray main pipe can be pulled out of the tower by tightening the corresponding lifting rope, so that one end of the spray main pipe is completely located inside the tower, which is convenient for placing one end of the spray main pipe on the mobile trolley 1.

[0054] Preferably, the lifting hoist 2 can be a manual hoist or an electric hoist 3; considering that the internal space of the absorption tower is not abundant and the disadvantage of the electric hoist 3 being heavy, a manual hoist is preferred here.

[0055] Preferably, considering that the gap between some absorption towers and the spray main pipe is small, a hole can be opened at the position of the end of the spray main pipe corresponding to the absorption tower to allow the spray main pipe to be moved out of the absorption tower and to provide space for adjusting the inclination of the spray main pipe.

[0056] In one embodiment, before step S3, the method further includes:

[0057] Start the hoisting hoist 2 at the lifting point B and continue to tighten the lifting rope until one end of the spray pipe is pulled out of the tower to a predetermined length. With this design, on the one hand, the spray pipe is pulled out of the tower to a predetermined length by the hoisting hoist 2, which facilitates the connection between the lifting rope on the first lifting device and the spray pipe. On the other hand, since the first lifting device is connected to the spray pipe through the lifting rope, the spray pipe will be pulled upward obliquely. If the length of the spray pipe in the tower is too long, the spray pipe is close to a horizontal state, which makes it difficult for the upward pulling force to pull the spray pipe to move. If the length of the spray pipe in the tower is not long, the spray pipe will have a larger upward tilt angle under the pulling of the first lifting device, which is more conducive to pulling the spray pipe.

[0058] In one embodiment, in step S3, when the first lifting device pulls the spray pipe out of the tower, the lifting hoist 2 at the lifting point A is always connected to the end of the spray pipe to prevent the pipe from rushing out of the tower. This design can control the speed of the spray pipe out of the tower by always pulling the tail of the spray pipe with the lifting hoist 2, and prevent the pipe from suddenly rushing out of the tower, which is a reasonable design.

[0059] In one embodiment, in step S5, the spray main pipe is lifted by two lifting ropes through the first lifting device and / or the second lifting device. The lifting rope on the side of the corresponding mobile trolley 1 on the spray main pipe is provided with an electric hoist 3. The electric hoist 3 is used to change the length of the lifting rope on this side, adjust the suspension posture of the spray main pipe, and after one end of the spray main pipe is extended into the tower and falls on the mobile trolley 1, the lifting rope corresponding to this side is always in a relaxed state, thereby releasing the lifting device on the side of the corresponding mobile trolley 1 of the spray main pipe.

[0060] In a specific implementation, the electric hoist 3 is located on a suspension rope close to one side of the mobile trolley 1. The length of the corresponding suspension rope is changed by the electric hoist 3. Since the length of the suspension rope on the other side remains unchanged and the length of the suspension rope on one side changes, the suspension posture of the spray pipe can be changed, so that one end of the spray pipe can be moved up and down, so that the end of the spray pipe is conveniently aligned with the perforation on the tower body and enters the tower; after one end of the spray pipe extends into the tower and falls on the mobile trolley 1, the weight of the spray pipe is borne by the mobile trolley 1 and the other suspension rope, and the suspension rope where the electric hoist 3 is located remains in a relaxed state, so that the suspension rope where the electric hoist 3 is located can enter the tower together with the spray pipe, and will not damage the tower body or hinder the movement of the spray pipe; after the end of the suspension rope where the electric hoist 3 is located enters the tower body, the suspension rope where the electric hoist 3 is located can be separated from the spray pipe by the staff.

[0061] Preferably, the electric hoist 3 is a remote control electric hoist 3, and the electric hoist 3 can be controlled to work by remote control.

[0062] In one embodiment, in step S5, the hoisting hoist 2 at the lifting point A is connected to the spray main pipe entering the tower, so as to drive the spray main pipe to move into the tower.

[0063] In one embodiment, in step S6 , the sprinkler main pipe is hoisted by two hoisting hoists 2 .

[0064] In one embodiment, a guide rail 4 is provided at the bottom of the mobile trolley 1, and both ends of the guide rail 4 are connected to the tower body. The mobile trolley 1 moves on the guide rail 4. After the spray main pipe is replaced, the guide rail 4 and the mobile trolley 1 need to be removed. With this design, since the internal space of the absorption tower is limited and the sprayed water is corrosive, all the corresponding components need to be removed after the spray main pipe is replaced.

[0065] Preferably, there are two guide rails 4 , and rollers cooperating with the guide rails 4 are provided at the bottom of the mobile vehicle 1 .

[0066] In one embodiment, a rotating tray 11 is provided on the top of the mobile trolley 1, and the rotating tray 11 can rotate relative to the mobile trolley 1 and support the end of the spray pipe. With this design, since the spray pipe is not moving in a straight line during movement, the rotating tray 11 can be set so that the spray pipe can swing when it shakes, thereby preventing the lateral force of the spray pipe from being transmitted to the mobile trolley 1 and preventing the mobile trolley 1 from derailing.

[0067] It should be pointed out that the specific structure of the rotating tray 11 is common knowledge to those skilled in the art, so its structure will not be described in detail here.

[0068] It should be noted that the technical solution of the present application can also be used for the replacement of the spray mains on the lower level and other large pipelines; at the same time, the technical solution of the present application is not limited to the replacement of pipelines on the absorption tower, but can also be applied to any scenario with the same installation form as the absorption tower spray main.

[0069] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

[0070] It should be noted that if the embodiments of the invention involve directional indications (such as up and down), the directional indications are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0071] In addition, the meaning of "and / or" appearing in the full text includes three parallel solutions. Taking "A and / or B" as an example, it includes solution A, solution B, or solutions that satisfy both A and B. In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the invention, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, "multiple" means more than two. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in the field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by the invention.

Claims

1. A method for replacing the top spray main pipe of an absorption tower, characterized in that: include: S1. A movable trolley (1) capable of moving along the length direction of the spray main pipe is arranged below the spray main pipe; S2. Remove the connectors at both ends of the spray pipe, and place one end of the spray pipe on the mobile trolley (1). The mobile trolley (1) moves along with the spray pipe while supporting the end of the spray pipe; S3, setting a first lifting device, the first lifting device is connected to the end of the spray main pipe away from the moving trolley (1) from outside the tower through a lifting rope, and pulls the spray main pipe outside the tower to a predetermined length; S4, setting a second lifting device, the second lifting device is connected to the spray main pipe extending out of the tower and close to the side of the mobile trolley (1) through a lifting rope from outside the tower, and then the absorption tower is lifted out by the joint lifting of the first lifting device and the second lifting device; S5, hoisting the new spray pipe horizontally to the predetermined position, and extending one end of the spray pipe into the tower and landing on the moving trolley (1), then releasing the hoisting of the corresponding side of the moving trolley (1) of the spray pipe, and pushing the spray pipe into the tower until it moves to the predetermined length; S6. Lift the sprinkler main pipe by hoisting, and connect the corresponding connectors to both ends of the sprinkler main pipe to complete the replacement of the sprinkler main pipe.

2. The method for replacing the top spray main pipe of the absorption tower according to claim 1, characterized in that: Step S2 includes: S21, installing a lifting point A and a lifting point B inside the tower wall, and respectively arranging two lifting hoists (2) connected to the lifting point A and the lifting point B, respectively, the other ends of the two lifting hoists (2) are connected to the corresponding two ends of the spray main pipe, and the lifting rope of the lifting hoist (2) at the lifting point B is inclined; S22, removing the connectors at both ends of the spray pipe, so that the spray pipe can move along its own length direction, and under the action of two lifting hoists (2), suspend it in the tower; at this time, determine whether one end of the spray pipe is completely located in the tower and is in a suspended state, if so, proceed to step S24, if not, proceed to step S23; S23, start the hoisting hoist (2) at the lifting point B, tighten the lifting rope, and pull one end of the spray pipe out of the tower. At the same time, the lifting rope of the hoisting hoist (2) at the lifting point A is correspondingly loosened, and the spray pipe is kept in a suspended state until the first end of the spray pipe is completely entered into the tower and is in a suspended state; S24, move the mobile trolley (1) to below one end of the spray pipe in the tower, start the lifting hoist (2) at the lifting point A, and lower one end of the spray pipe onto the mobile trolley (1).

3. The method for replacing the top spray main pipe of the absorption tower according to claim 2, characterized in that: Before step S3, the method further includes: Start the hoisting hoist (2) at the lifting point B, tighten the lifting rope, and pull one end of the sprinkler main pipe out of the tower to a predetermined length.

4. The method for replacing the top spray main pipe of the absorption tower according to claim 2, characterized in that: In step S3, when the first lifting device pulls the spray main pipe out of the tower, the lifting hoist (2) at the lifting point A is always connected to the end of the spray main pipe to prevent the main pipe from rushing out of the tower.

5. The method for replacing the top spray main pipe of the absorption tower according to claim 2, characterized in that: In step S5, the suspension rope on the side of the corresponding mobile trolley (1) on the spray main pipe is provided with an electric hoist (3), and the electric hoist (3) is used to change the length of the suspension rope on this side, adjust the suspension posture of the spray main pipe, and after one end of the spray main pipe extends into the tower and falls on the mobile trolley (1), the suspension rope corresponding to this side is always in a relaxed state, thereby releasing the suspension of the side of the corresponding mobile trolley (1) of the spray main pipe.

6. The method for replacing the top spray main pipe of the absorption tower according to claim 2, characterized in that: In step S5, the hoisting hoist (2) at the lifting point A is connected to the spray main pipe entering the tower, driving the spray main pipe to move into the tower.

7. The method for replacing the top spray main pipe of the absorption tower according to claim 2, characterized in that: In step S6, the spray main pipe is hoisted by two hoisting hoists (2).

8. The method for replacing the top spray main pipe of the absorption tower according to any one of claims 1 to 7, characterized in that: A guide rail (4) is provided at the bottom of the movable trolley (1), and both ends of the guide rail (4) are connected to the tower body. The movable trolley (1) moves on the guide rail (4). After the replacement of the spray main pipe is completed, the guide rail (4) and the movable trolley (1) are removed.

9. The method for replacing the top spray main pipe of the absorption tower according to any one of claims 1 to 7, characterized in that: A rotating tray (11) is arranged on the top of the moving trolley (1), and the rotating tray (11) can rotate relative to the moving trolley (1) and support the end of the spray pipe.

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