Climbing device for overhauling alkali recovery furnace tube screen

Abstract

The utility model discloses a climbing device for overhauling a tube panel of a superheater of an alkali recovery furnace, which comprises a plurality of climbing units mounted at different heights on the outer side of the tube panel to form a climbing ladder from bottom to top and an overhauling platform built between two groups of climbing ladders; according to the climbing unit, a fastening assembly is arranged on the outer side of the tube panel and connected with the outer side of the tube panel; the supporting plates are arranged on the fastening assemblies and located on the outer side of the tube panel, and the supporting plates of the climbing units form climbing ladder pedals from bottom to top. According to the climbing device, during unplanned first-aid repair, first-aid repair personnel can quickly reach corresponding first-aid repair positions, the maintenance efficiency can be effectively improved, and the furnace shutdown time during first-aid repair is shortened.

Description

Technical Field

[0001] The utility model relates to the technical field of alkali recovery furnace tube panel maintenance, in particular to a climbing device for alkali recovery furnace tube panel maintenance. Background Art

[0002] The alkali recovery furnace uses the waste liquid (black liquor) discharged after alkali papermaking and pulp washing. After concentration, it is fed into the furnace as fuel for combustion. After the black liquor is burned, liquid slag is discharged from the furnace bottom and causticized to be reduced to alkali. The steam is reused as a secondary energy source. The production process is subject to high temperature, high pressure, high-temperature corrosion, and wear and tear on the pipes caused by flue gas and dust particles. Therefore, the high-temperature pipe bundles need to be inspected regularly. If a leak occurs, the furnace must be shut down immediately to create maintenance conditions for repair and resumption of production in a short time. The location requiring inspection and treatment is over 10 meters high. Because access to the top of the furnace is restricted by a 475mm manhole, working at height can only be done by erecting scaffolding or welding stairs inside the furnace, which is labor-intensive and time-consuming.

[0003] Based on this, it is necessary to study a special tool for use in maintenance operations to improve work efficiency while ensuring safety. Utility Model Content

[0004] In response to the above problems, the utility model provides a climbing device for the maintenance of the alkali recovery furnace tube panel, which is installed between two tube panels to form a temporary climbing ladder so that maintenance personnel can climb from the manhole of the furnace to the corresponding maintenance position, thereby improving the maintenance efficiency. It is particularly suitable for unplanned emergency repairs, and can create maintenance conditions in a shorter time, reducing the shutdown time.

[0005] Specifically, the utility model provides a climbing device for repairing an alkali recovery furnace tube panel, comprising: a plurality of climbing units, wherein the plurality of climbing units are installed at different heights outside the tube panel to form a climbing ladder from bottom to top;

[0006] The climbing unit comprises:

[0007] A fastening assembly is provided on the outside of the tube panel and connected to the outside of the tube panel;

[0008] A support plate is provided on the fastening assembly and is located outside the tube panel. The support plates of the plurality of climbing units form a climbing ladder pedal from bottom to top.

[0009] Furthermore, the fastening assembly includes:

[0010] Two fastening fasteners, each having a semicircular groove on its inner side, and the two fastening fasteners enclose and clamp the outermost superheater tube of the tube panel;

[0011] The two fasteners are connected by bolts, and a limit assembly is provided on the side of the fastener away from the tube panel. The limit assembly is used to limit the fastener so that the fastener moves only along the axial direction of the bolt, so that the two fasteners clamp the superheater tube from both sides of the superheater tube on the outermost side of the tube panel.

[0012] Furthermore, the limiting assembly includes: a plurality of limiting blocks provided on the two fastening fasteners, the plurality of limiting blocks on the same fastening fastener being arranged in a vertical direction and forming a comb-like structure in the vertical direction, and the limiting blocks on the two fastening fasteners being arranged crosswise so that the limiting blocks move along the comb-tooth grooves;

[0013] The bolt is inserted into the comb tooth groove and connected with the limit block.

[0014] Furthermore, there are two support plates, which are respectively located outside the tube panel and between two adjacent tube panels.

[0015] Furthermore, a diagonal brace is provided between the support plate and the fastening fastener.

[0016] Working principle:

[0017] During unplanned emergency repairs, enter the furnace from the corresponding manhole in the furnace according to the location where maintenance is required. There is a platform at the manhole, and the climbing units are installed one by one on the tube panel 6 from the manhole platform. When installing, install them one by one from bottom to top. First, close the two fasteners 1 of the bottom climbing unit from both sides of the superheater tube on the outermost side of the tube panel 6, and the comb-tooth structures of the two fasteners 1 are clamped together. Then, they are connected with bolts 5. Under the action of the limit block 3 and the comb-tooth groove 31, the fastener 1 can only move horizontally, so that during the tightening process of the bolt 5, the comb-tooth structure and the bolt 5 form a clamping structure similar to a pipe clamp, thereby clamping the superheater tube on the outermost side of the tube panel 6.

[0018] After a certain number of climbing units are installed, maintenance personnel climb upward from the bottom climbing unit. During the climbing process, the support plate under the downward force will cause the lower part of the fastening component to squeeze the superheater tube, further enhancing the fastening effect by applying pressure to it, thereby improving safety.

[0019] Compared with the prior art, the present invention has the following beneficial effects:

[0020] (1) The climbing device for repairing the alkali recovery furnace tube screen provided by the utility model is suitable for quickly reaching the corresponding repair position during unplanned repairs, which can effectively improve the repair efficiency and reduce the downtime of the furnace during repairs.

[0021] (2) The clamping structure similar to that of a pipe clamp is formed by bolts and a comb-shaped structure, which can not only effectively clamp the heat exchanger tubes and improve safety performance, but also solve the problem that the distance between adjacent heat exchanger tubes in the same tube panel is too small and conventional pipe clamps cannot be installed. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is a schematic structural diagram of the climbing device for repairing the alkali recovery furnace tube panel in Example 1;

[0023] Figure 2 This is a schematic structural diagram of the climbing unit in Example 1;

[0024] Figure 3 This is an exploded view of the climbing unit in Example 1;

[0025] Figure 4 This is a diagram showing the use of the climbing device for repairing the alkali recovery furnace tube panel in Example 1;

[0026] Figure 5 This is a schematic diagram of the state of the alkali recovery furnace tube panel in Example 1 being temporarily placed on the climbing device for maintenance;

[0027] Figure 6 This is a schematic structural diagram of the climbing unit in Example 2;

[0028] Figure 7 This is a schematic structural diagram of the detachable diagonal brace in Example 2;

[0029] Reference numerals:

[0030] 1-fastening fastener; 2-support plate; 3-limiting block; 31-comb groove; 4-diagonal brace; 5-bolt; 6-tube screen; 7-flat plate. DETAILED DESCRIPTION

[0031] The present invention will be further described in detail below through specific implementations in conjunction with the accompanying drawings.

[0032] Example 1

[0033] like Figure 1 As shown, this embodiment provides a climbing device for maintenance of the alkali recovery furnace tube panel, comprising: a plurality of climbing units, which are installed at different heights on the outside of the tube panel 6 by clamping the outermost superheater tubes to form a climbing ladder from bottom to top, so that maintenance personnel can quickly climb to the corresponding height for maintenance, thereby achieving the purpose of improving maintenance efficiency and reducing the downtime time during emergency repairs.

[0034] Specifically, if Figure 2-3As shown, the climbing unit comprises a fastening assembly and a support plate 2. The fastening assembly includes two fasteners 1. The two fasteners 1 are connected by bolts 5 on the side away from the tube panel 6. The bolts 5 are M16 bolts to ensure fastening strength. Because the gap between adjacent superheater tubes in the same tube panel 6 is small, it is not convenient to install fasteners such as bolts. Therefore, this embodiment designates that the two fasteners 1 on this side are not connected, and the bolt 5 connection is only performed on the side away from the tube panel 6. This solves the problem of too small a gap between superheater tubes and inconvenient installation. Semicircular grooves are provided on the side of the fasteners 1 that are close to each other. The two semicircular grooves together form a cylindrical clamping cavity that accommodates the superheater tubes of the tube panel 6. Its cross-section is circular and has a diameter of 50 mm. It should be noted that the thickness between the unconnected end of the fastener 1 and the semicircular groove must be less than the gap between adjacent superheater tubes in the same tube panel 6; otherwise, installation will be impossible.

[0035] A limit block 3 is provided on the side of each fastener 1 away from the tube panel, and a comb groove 31 is formed between two adjacent limit blocks 3, so that a comb-like structure is formed on the side of the fastener 1 away from the tube panel. The limit blocks 3 on the two fasteners 1 are arranged crosswise, so that the limit blocks 3 can enter the comb groove 31 opposite to it and move horizontally along the comb groove 31. The bolts 5 pass through the comb groove 31 and are fastened to the limit blocks 3, so that the entire fastening assembly forms a clamping structure similar to a pipe clamp. Through the limiting effect of the limit blocks 3 and the comb groove 31, the two fasteners 1 can only move horizontally towards / away from each other, and after the bolts 5 are tightened, the connection of the bolts 5 will not be deformed, resulting in slight rotation of the unconnected end, causing the superheater tube to be loosely clamped.

[0036] There are two support plates 2, which are respectively located on the outside of the tube panel 6 and in the gap between two adjacent tube panels 6. A diagonal brace 4 is welded between the support plate 2 and the fastener 1 to improve the supporting strength of the support plate 2.

[0037] Specifically, if Figure 4 As shown, during unplanned emergency repairs, the furnace is entered through the corresponding manhole in the furnace, depending on the location to be inspected. The manhole is equipped with a platform, and the climbing units are installed one by one on the tube panels from the manhole platform. During installation, they are installed one by one from the bottom up. First, the two fasteners 1 of the bottom climbing unit are closed on both sides of the outermost superheater tube of the tube panel 5. The limit blocks 3 of the two fasteners 1 are respectively inserted into the corresponding comb grooves 31. Then, they are connected with bolts 5. Under the action of the limit blocks 3 and comb grooves 31, the fasteners 1 can only move horizontally. When the bolts 5 are tightened, the comb-shaped structure and the bolts 5 form a clamping structure similar to that of a pipe wrench, thereby clamping the outermost superheater tube of the tube panel 6.

[0038] After a certain number of climbing units have been installed, the maintenance personnel will climb up from the bottom climbing unit. During the climbing process, the support plate 2, which is subjected to the downward force, will cause the lower part of the fastening assembly to squeeze the superheater tube, further strengthening the fastening effect by applying pressure to it, thereby improving safety. It should be noted that if the emergency repair location is high and it is impossible to install the climbing unit at a high position, it is necessary to first climb up a certain height from the installed climbing unit. Then, the workers will use two support plates 2 as support points and stand on the two support points to install the climbing unit at a higher position, thereby achieving the installation of the climbing unit at a higher position.

[0039] In addition, if Figure 5 As shown, at the position corresponding to the emergency repair height, two parallel climbing units can be installed on other tube panels 6. At this time, a flat plate 7 can be placed on the two parallel support plates 2 as a temporary repair platform for emergency repairs to facilitate emergency repair operations.

[0040] Example 2

[0041] like Figure 6-7 As shown, the diagonal brace 4 is a detachable diagonal brace, the upper end of which is connected to the support plate 2 through a pin shaft, and the lower part is connected to the fastening fastener 1 through a fastener, so that the diagonal brace 4 can be taken away when disassembled.

[0042] The above examples are used to illustrate the present invention, which are only used to help understand the present invention and are not intended to limit the present invention. Those skilled in the art of the present invention can make some simple deductions, modifications or substitutions based on the concept of the present invention.

Claims

1. A climbing device for repairing alkali recovery furnace tube panels, characterized in that: include: A plurality of climbing units, wherein the plurality of climbing units are installed at different heights outside the tube panel (6) to form a climbing ladder from bottom to top; The climbing unit comprises: A fastening assembly is provided on the outside of the tube panel (6) and is connected to the outside of the tube panel (6); A support plate (2) is provided on the fastening assembly and is located outside the tube panel (6). The support plates (2) of the plurality of climbing units form a climbing ladder step from bottom to top.

2. The climbing device for repairing the alkali recovery furnace tube panel according to claim 1, characterized in that: The fastening assembly comprises: Two fastening fasteners (1), the inner sides of the two fastening fasteners (1) are semicircular grooves, and the two fastening fasteners (1) surround and clamp the outermost superheater tubes of the tube panel (6); The two fasteners (1) are connected by bolts (5), and a limiting assembly is provided on the side of the fastener (1) away from the tube panel (6). The limiting assembly is used to limit the fastener (1) so that the fastener (1) only moves axially along the bolt (5), so that the two fasteners (1) clamp the superheater tube from both sides of the outermost superheater tube of the tube panel (6).

3. The climbing device for repairing the alkali recovery furnace tube panel according to claim 2, characterized in that: The limiting assembly comprises: a plurality of limiting blocks (3) provided on the two fastening fasteners (1); the plurality of limiting blocks (3) on the same fastening fastener (1) are arranged in a vertical direction and form a comb-tooth structure in the vertical direction; the limiting blocks (3) on the two fastening fasteners (1) are arranged crosswise so that the limiting blocks (3) move along the comb-tooth grooves (31); The bolt (5) is connected to the limiting block (3) after passing through the comb tooth groove (31).

4. The climbing device for repairing the alkali recovery furnace tube panel according to any one of claims 1 to 3, characterized in that: Two support plates (2) are provided, and the two support plates (2) are respectively located outside the tube panel (6) and between two adjacent tube panels (6).

5. The climbing device for repairing the alkali recovery furnace tube panel according to claim 1, characterized in that: A diagonal brace (4) is provided between the support plate (2) and the fastening fastener (1).

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