Method for replacing a spray main of an absorption tower top layer

Abstract

The application provides a kind of absorption tower top layer spray main pipe replacement method, comprising: S1, mobile trolley is arranged below the spray main pipe;S2, one end of the spray main pipe falls on the mobile trolley;S3, first hoisting device is arranged, and the spray main pipe is pulled to the predetermined length outside the tower by the lifting rope;S4, second hoisting device is arranged, and the spray main pipe is hoisted out of the absorption tower by the lifting rope;S5, new spray main pipe is hoisted to the predetermined position, and one end of the spray main pipe is inserted into the tower and falls on the mobile trolley, then the lifting device on the corresponding side of the spray main pipe is removed, and the spray main pipe is pushed into the tower;S6, the spray main pipe is hoisted, and the corresponding connecting piece is connected to both ends of the spray main pipe, and the replacement of the spray main pipe is completed.The application solves the problem of how to hoist the spray main pipe out of the tower and how to hoist the new spray main pipe back, and provides a new way for the technical upgrading of the absorption tower.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of absorption tower maintenance, in particular to a method for replacing a top layer spray main pipe of an absorption tower. BACKGROUND

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

[0003] The absorption tower is a commonly used device in flue gas desulfurization disposal, and the inside of the absorption tower is usually provided with multiple spray layers distributed upward and downward. The main function of the spray layers is to spray slurry from top to bottom to contact flue gas to generate a chemical absorption reaction, and to cool the flue gas to achieve the purpose of ultra-low emission.

[0004] Currently, technical upgrading and transformation of original equipment has become the main theme, and the upgrading and transformation of the absorption tower is also timely. In the process of upgrading and transformation of the absorption tower, the spray main pipe of the spray layer needs to be replaced. Since the spray layer has multiple layers, the spray main pipe in the lower layer can use the spray main pipe in the upper layer as a traction point and be gradually suspended outside the tower, but the top layer spray main pipe has a demister layer above it, and the bearing capacity of the end beam of the demister layer is insufficient to support the weight of the suspended spray main pipe (the diameter of the spray main pipe is 1 meter, the length is 14 meters, and the weight is about 7.5 tons). Therefore, how to hoist the top layer spray main pipe of the absorption tower out of the tower and how to hoist the new spray main pipe back into the tower have become a big problem that we must face. SUMMARY

[0005] The main purpose of the present application is to provide a method for replacing the top layer spray main pipe of the absorption tower, which can hoist the top layer spray main pipe of the absorption tower out of the tower and hoist the new spray main pipe back into the tower.

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

[0007] S1, a mobile trolley capable of moving along the length direction of the spray main pipe is arranged below the spray main pipe;

[0008] S2, the connecting pieces at both ends of the spray main pipe are removed, and one end of the spray main pipe is allowed to fall on the mobile trolley, and the mobile trolley moves along with the spray main pipe while supporting the end of the spray main pipe;

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

[0010] S4, set the second lifting device, the second lifting device is connected with the spray main pipe through the sling from the outside of the tower and close to the side of the moving trolley, then under the common lifting of the first lifting device and the second lifting device, the absorption tower is lifted out;

[0011] S5, the new spray main pipe is transversely lifted to the predetermined position, and one end of the spray main pipe is extended into the tower and falls on the moving trolley, then the lifting device on the side of the corresponding moving trolley of the spray main pipe is released, and the spray main pipe is pushed to move into the tower until it moves to the predetermined length;

[0012] S6, the spray main pipe is lifted by lifting, and the corresponding connecting piece is connected with the two ends of the spray main pipe, and the replacement of the spray main pipe is completed.

[0013] Further, in step S2, comprising:

[0014] S21, a lifting point A and a lifting point B are installed inside the tower wall, and two lifting hoists are respectively connected with the lifting point A and the lifting point B, the other ends of the two lifting hoists are connected with the corresponding two ends of the spray main pipe, and the lifting rope of the lifting hoist at the lifting point B is in an inclined state;

[0015] S22, the connecting pieces at the two ends of the spray main pipe are removed, so that the spray main pipe can move along the length direction of itself, and is suspended in the tower under the action of the two lifting hoists; at this time, it is judged whether one end of the spray main pipe is completely located in the tower and in a suspended state, if yes, step S24 is entered, if not, step S23 is entered;

[0016] S23, the lifting hoist at the lifting point B is started, the lifting rope is tightened, one end of the spray main pipe is pulled out of the tower, the lifting rope of the lifting hoist at the lifting point A is correspondingly loosened, and the spray main pipe is kept in a suspended state, until the first end of the spray main pipe completely enters the tower and is in a suspended state;

[0017] S24, the moving trolley is moved to below the end of the spray main pipe located in the tower, and the lifting hoist at the lifting point A is started to lower one end of the spray main pipe to the moving trolley.

[0018] Further, before step S3, further comprising:

[0019] The lifting hoist at the lifting point B is started to tighten the lifting rope, and one end of the spray main pipe is pulled out of the tower by a predetermined length.

[0020] Further, 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 with the end of the spray main pipe to prevent the main pipe from rushing out of the tower.

[0021] Further, in step S5, the lifting rope on the side of the corresponding moving trolley of the spray main pipe is lifted, and an electric hoist is arranged on the lifting rope, the electric hoist is used to change the length of the lifting rope on the side, adjust the suspension posture of the spray main pipe, and make the corresponding lifting rope on the side always in a relaxed state after the end of the spray main pipe is inserted into the tower and falls on the moving trolley, and the lifting of the spray main pipe on the side of the corresponding moving trolley is released.

[0022] Further, in step S5, the spray main pipe is connected with the lifting hoist at the lifting point A and is driven to move into the tower.

[0023] Further, in step S6, the spray main pipe is lifted by two lifting hoists.

[0024] Further, the bottom of the moving trolley is provided with guide rails, the two ends of the guide rails are connected with the tower body, and the moving trolley moves on the guide rails; after the replacement of the spray main pipe is completed, the guide rails and the moving trolley are removed.

[0025] Further, the top of the moving trolley is provided with a rotating tray, the rotating tray can rotate relative to the moving trolley and supports the end of the spray main pipe.

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

[0027] The present application supports one end of the spray main pipe by the moving trolley, moves together with the spray main pipe, drags the other end of the spray main pipe out of the tower under the traction of the first lifting device, then cooperates with the second lifting device to lift the spray main pipe out of the absorption tower, and completes the removal of the spray main pipe; when installing a new spray main pipe, the new spray main pipe is horizontally lifted to the predetermined position, and one end of the spray main pipe is inserted into the tower and falls on the moving trolley; after the lifting rope on one end of the spray main pipe is released, the spray main pipe is pushed into the tower, and finally the spray main pipe is moved to the designated installation position by lifting and connected with the corresponding connecting piece, and the replacement of the spray main pipe is completed. The present application solves the problems of how to lift the spray main pipe out of the tower and how to lift the new spray main pipe back to the installation, provides a new idea for the technical upgrading and transformation of the absorption tower. BRIEF DESCRIPTION OF DRAWINGS

[0028] In the drawings:

[0029] Figure 1 The position distribution diagram of the spray main pipe replacement method of the absorption tower at the lifting point A and the lifting point B in the present application;

[0030] Figure 2 The state diagram of the first lifting device at the lifting point B dragging one end of the spray main pipe out of the tower in the present application;

[0031] Figure 3 The installation state diagram of the new spray main pipe;

[0032] Figure 4 The position distribution diagram of the spray main pipe and the absorption tower in the application;

[0033] Figure 5 The structure view of the moving trolley in the application.

[0034] Explanation of reference signs:

[0035] 1, moving trolley; 11, rotating tray; 2, hoist; 3, electric hoist; 4, guide rail. DETAILED DESCRIPTION

[0036] The application will be further described in detail below in conjunction with the drawings and embodiments. Obviously, the described embodiments are only part of the embodiments of the application, rather than all the embodiments. In the case of no conflict, all other embodiments obtained by the applicant without creative labor shall fall within the protection scope of the application.

[0037] Reference Figures 1 to 5 .

[0038] The application discloses a kind of absorption tower top layer spray main pipe replacement method, comprising:

[0039] S1, moving trolley 1 can be moved along the length direction of spray main pipe is arranged below the spray main pipe;

[0040] S2, the connecting piece of both ends of spray main pipe is removed, and one end of spray main pipe falls on moving trolley 1, while supporting the end of spray main pipe, moving trolley 1 moves along with spray main pipe;

[0041] S3, the first hoisting device is arranged, and the first hoisting device is connected with the end of spray main pipe away from moving trolley 1 by rope from outside the tower (the "tower" refers to "absorption tower", and the following will not be explained again);And spray main pipe is pulled to the predetermined length outside the tower;

[0042] S4, the second hoisting device is arranged, and the second hoisting device is connected with the side of spray main pipe close to moving trolley 1 by rope from outside the tower, then under the common hoisting of the first hoisting device and the second hoisting device, the absorption tower is lifted out;

[0043] S5, new spray main pipe is hoisted horizontally to the predetermined position, and one end of spray main pipe is inserted into the tower and falls on moving trolley 1, then the hoisting device on the side of spray main pipe corresponding to moving trolley 1 is removed, and spray main pipe is pushed to move into the tower until it moves to the predetermined length;

[0044] S6, the spray main pipe is lifted by lifting, and the corresponding connecting pieces are connected with the two ends of the spray main pipe, so that the replacement of the spray main pipe is completed.

[0045] In the embodiment, the end of the spray main pipe at the top of the absorption tower is supported by the moving trolley 1. While the spray main pipe is moving, the moving trolley 1 moves together with the spray main pipe. The other end of the spray main pipe is pulled out of the tower to a predetermined length under the traction of the first lifting device. Then, the second lifting device is connected with the side of the spray main pipe that is extended out of the tower and close to the moving trolley 1. Then, the absorption tower is lifted out under the joint lifting of the first lifting device and the second lifting device, and the spray main pipe is removed. When installing a new spray main pipe, the new spray main pipe is transversely lifted to a predetermined position, and the end of the spray main pipe is extended into the tower and falls on the moving trolley 1. After the lifting rope of the end of the spray main pipe is released, the spray main pipe is pushed into the tower. The spray main pipe in the tower is moved to a designated installation position under the last lifting, and is connected with the corresponding connecting piece, so that the replacement of the spray main pipe is completed.

[0046] The present application solves the problems of how to lift the spray main pipe out of the tower and how to lift the new spray main pipe back to the tower, 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 an embodiment, step S2 comprises:

[0049] S21, a lifting point A and a lifting point B are respectively installed on the tower wall inside the upper part of the two ends of the spray main pipe, and two lifting hoists 2 are respectively connected with the lifting point A and the lifting point B. The other ends of the two lifting hoists 2 are connected with the two ends of the spray main pipe, and the lifting rope of the lifting hoist 2 at the lifting point B is in an inclined state.

[0050] S22, the connecting pieces at the two ends of the spray main pipe are removed, so that the spray main pipe can move along the length direction thereof and is suspended in the tower under the action of the two lifting hoists 2. At this time, it is judged whether one end of the spray main pipe is completely located in the tower and in a suspended state. If yes, step S24 is entered, and if not, step S23 is entered.

[0051] S23, the lifting hoist 2 at the lifting point B is started, the lifting rope is tightened, one end of the spray main pipe is pulled out of the tower, the lifting rope of the lifting hoist 2 at the lifting point A is correspondingly loosened, and the spray main pipe is kept in a suspended state, until the first end of the spray main pipe completely enters the tower and is in a suspended state.

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

[0053] In the embodiment, the two lifting winches 2 can make the spray main pipe in a suspended state, which is convenient for the removal of the connecting pieces at both ends of the spray main pipe. Meanwhile, by inclining 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 in the tower, and the end of the spray main pipe can be placed on the mobile trolley 1.

[0054] Preferably, the lifting winch 2 can be a manual winch or an electric winch 3. Considering that the space inside the absorption tower is not spacious and the electric winch 3 is heavy, the manual winch is preferred.

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

[0056] In an embodiment, before step S3, the method further comprises:

[0057] The lifting winch 2 at the lifting point B is started to continue tightening the lifting rope until one end of the spray main pipe is pulled out of the tower by a predetermined length. This design is beneficial in two aspects. On the one hand, the spray main pipe is pulled out of the tower by a predetermined length by the lifting winch 2, which is convenient for connecting the lifting rope on the first lifting device with the spray main pipe. On the other hand, since the first lifting device is connected with the spray main pipe through the lifting rope, the spray main pipe is pulled obliquely upward. If the length of the spray main pipe located in the tower is too long, the spray main pipe tends to be horizontal, which makes it difficult to pull the spray main pipe. If the length of the spray main pipe located in the tower is not too long, the spray main pipe will be inclined upward at a larger angle when pulled by the first lifting device, which is more conducive to pulling the spray main pipe.

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

[0059] In an embodiment, in step S5, the spray main pipe is hoisted by the first hoisting device and / or the second hoisting device with two ropes, the rope corresponding to the side of the moving trolley 1 is provided with an electric hoist 3 for changing the length of the side rope, adjusting the suspension posture of the spray main pipe, and keeping the corresponding side rope in a relaxed state after the end of the spray main pipe enters the tower and falls on the moving trolley 1, and releasing the hoisting of the corresponding side of the spray main pipe of the moving trolley 1.

[0060] In a specific implementation, the electric hoist 3 is located on the rope near the side of the moving trolley 1, and the length of the corresponding rope is changed by the electric hoist 3. Since the length of the rope on the other side is unchanged, the length of the rope on one side is changed, so that the suspension posture of the spray main pipe can be changed, and the end of the spray main pipe can be moved up and down, facilitating the alignment of the end of the spray main pipe with the perforation on the tower body and the entry of the tower; after the end of the spray main pipe enters the tower and falls on the moving trolley 1, the weight of the spray main pipe is borne by the moving trolley 1 and the other rope, and the rope where the electric hoist 3 is located is kept in a relaxed state, so that the rope where the electric hoist 3 is located can enter the tower together with the spray main pipe and will not damage the tower body or hinder the movement of the spray main pipe; after the end of the rope where the electric hoist 3 is located enters the tower body, the rope where the electric hoist 3 is located can be separated from the spray main pipe by the worker.

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

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

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

[0064] In an embodiment, the bottom of the moving trolley 1 is provided with a guide rail 4, the two ends of the guide rail 4 are connected with the tower body, and the moving trolley 1 moves on the guide rail 4. After the replacement of the spray main pipe is completed, the guide rail 4 and the moving trolley 1 need to be removed. Due to the limited internal space of the absorption tower and the corrosive nature of the sprayed water, all the corresponding components need to be removed after the replacement of the spray main pipe.

[0065] Preferably, the guide rail 4 has two guide rails, and the bottom of the moving trolley 1 is provided with a roller cooperating with the guide rail 4.

[0066] In an embodiment, the top of the mobile trolley 1 is provided with a rotating tray 11, which can rotate relative to the mobile trolley 1 and supports the end of the spray main pipe. In this way, since the moving track of the spray main pipe is not a straight line during movement, the rotating tray 11 can swing when the spray main pipe swings, so as to avoid the lateral force of the spray main pipe being transmitted to the mobile trolley 1 and the mobile trolley 1 derailing and deviating.

[0067] It should be noted that the specific structure of the rotating tray 11 is known to those skilled in the art, and therefore the structure thereof 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 replacing the lower spray main pipe and replacing other large pipes; at the same time, the technical solution of the present application is not limited to replacing the pipe on the absorption tower, but can also be applied to any scene with the same installation form as the spray main pipe of the absorption tower.

[0069] The above only describes the preferred embodiments of the present application and is not intended to limit the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

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

[0071] In addition, the meaning of "and / or" appearing throughout the text includes three parallel schemes. Taking "A and / or B" as an example, it includes the A scheme, or the B scheme, or the scheme in which A and B are satisfied at the same time. In addition, if the embodiments of the present application involve "first", "second", etc. description, the "first", "second", etc. description is only for the purpose of description, and cannot be understood as indicating or implying the relative importance of the indicated technical features or implicitly indicating the number of the indicated technical features. Therefore, the features limited by "first", "second" can explicitly or implicitly include at least one of the features. In addition, "multiple" means two or more. In addition, the technical solutions of each embodiment can be combined with each other, but it must be based on the fact that a person skilled in the art can realize it, and when the combination of technical solutions appears contradictory or unachievable, it should be considered that the combination of technical solutions does not exist and is not within the protection scope of the present application.

Claims

1. A method of replacing a spray header in an absorption tower top section, characterized by, The method comprises the following steps: S1, a mobile trolley (1) capable of moving along the length direction of the spray main pipe is arranged below the spray main pipe; S2, the connecting members at both ends of the spray main pipe are removed, and one end of the spray main pipe is placed on the mobile trolley (1), and the mobile trolley (1) moves together with the spray main pipe while supporting the end of the spray main pipe; S3, a first lifting device is arranged, the first lifting device is connected with one end of the spray main pipe away from the mobile trolley (1) through a lifting rope from outside the tower, and the spray main pipe is pulled out to a predetermined length outside the tower; S4, a second lifting device is arranged, the second lifting device is connected with one side of the spray main pipe extending out of the tower and close to the mobile trolley (1) through a lifting rope from outside the tower, and then the tower is lifted out under the joint lifting of the first lifting device and the second lifting device; S5, the new spray main pipe is horizontally lifted to a predetermined position, one end of the spray main pipe is extended into the tower and placed on the mobile trolley (1), then the lifting device on the side of the spray main pipe corresponding to the mobile trolley (1) is removed, and the spray main pipe is pushed to move into the tower until it moves to a predetermined length; S6, the spray main pipe is lifted by lifting, and the corresponding connecting members are connected with both ends of the spray main pipe, thereby completing the replacement of the spray main pipe.

2. The method of claim 1, wherein the method further comprises: In step S2, the following steps are included: S21, a lifting point A and a lifting point B are installed inside the tower wall, and two lifting hoists (2) are arranged and connected with the lifting point A and the lifting point B respectively, the other ends of the two lifting hoists (2) are connected with the two ends of the spray main pipe, and the lifting rope of the lifting hoist (2) at the lifting point B is in an inclined state; S22, the connecting members at both ends of the spray main pipe are removed, the spray main pipe can move along the length direction of the spray main pipe, and is suspended in the tower under the action of the two lifting hoists (2); at this time, it is judged whether one end of the spray main pipe is completely located in the tower and in a suspended state, if yes, step S24 is entered, if not, step S23 is entered; S23, the lifting hoist (2) at the lifting point B is started, the lifting rope is tightened, one end of the spray main pipe is pulled out of the tower, the lifting rope of the lifting hoist (2) at the lifting point A is correspondingly loosened, and the spray main pipe is kept in a suspended state, until the first end of the spray main pipe completely enters the tower and is in a suspended state; S24, the mobile trolley (1) is moved to below the end of the spray main pipe located in the tower, and the lifting hoist (2) at the lifting point A is started to lower one end of the spray main pipe to the mobile trolley (1).

3. The method of claim 2, wherein the method further comprises: Before step S3, the following steps are included: The lifting hoist (2) at the lifting point B is started to tighten the lifting rope, and one end of the spray main pipe is pulled out of the tower to a predetermined length.

4. The method of claim 2, wherein the method further comprises: 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 with the end of the spray main pipe to prevent the main pipe from rushing out of the tower.

5. The method of claim 2, wherein the method further comprises: In step S5, the lifting rope on the corresponding moving trolley (1) on one side of the spray main pipe is provided with an electric hoist (3), which is used to change the length of the lifting rope on this side, adjust the suspension posture of the spray main pipe, and make the corresponding lifting rope on this side always in a relaxed state after the end of the spray main pipe enters the tower and falls on the moving trolley (1), thereby releasing the lifting of the corresponding moving trolley (1) on one side of the spray main pipe.

6. The method of claim 2, wherein the method further comprises: In step S5, the spray main pipe is connected with the lifting hoist (2) at the lifting point A and is driven to move into the tower.

7. The method of claim 2, wherein the method further comprises: In step S6, the spray main pipe is lifted by two lifting hoists (2).

8. The method of claim 1 to 7, wherein, The bottom of the moving trolley (1) is provided with a guide rail (4), the two ends of the guide rail (4) are connected with the tower body, and the moving trolley (1) moves on the guide rail (4). After the replacement of the spray main pipe is completed, the guide rail (4) and the moving trolley (1) are removed.

9. The method of claim 1 to 7, wherein, The top of the moving trolley (1) is provided with a rotating tray (11), which can rotate relative to the moving trolley (1) and support the end of the spray main pipe.

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