A method for installing a clean heat recovery coke oven gas collecting pipe

Abstract

A method for installing a clean heat recovery coke oven gas collecting pipe is characterized by comprising the following steps: a. deepening the roof structure of the permanent greenhouse according to the design, b. segmenting the gas collecting pipe, c. preparing for the installation and construction of the gas collecting pipe, d. performing gas collecting pipe installation operations, e. repeating the steps of dismantling the roof of the corresponding hoisting area of ​​the gas collecting pipe segment and installing the gas collecting pipe, f. welding all pipe segments after hoisting is completed; g. completing the opening of the connection between the gas collecting pipe and the bridge pipe according to the relative positions of the pipe, furnace body, and riser. The method for installing a clean heat recovery coke oven gas collecting pipe of the present invention has the advantages of deepening the design of the roof of the hoisting area in the early stage of installation, not dismantling the coke oven greenhouse on a large scale, facilitating timely dismantling and installation, saving construction time and cost, not using large cranes, convenient allocation of construction resources, high safety factor, and improving the accuracy and quality of the opening of the connection between the gas collecting pipe and the bridge pipe.

Description

Technical Field

[0001] The invention belongs to the technical field of steel structure installation, and in particular relates to a method for installing a clean heat recovery coke oven gas collecting pipe. Background Art

[0002] Heat recovery coke oven gas collectors are located on both the engine and coke sides. They are generally circular tubes welded from steel plates with a refractory lining. They are mounted on brackets at the top of the furnace columns and connected to the coke oven's carbonization chamber via risers and bridge pipes. High-temperature flue gas from the carbonization chamber is collected in the gas collectors and then transported to the boiler.

[0003] Existing technology has little experience in constructing heat recovery coke oven gas collecting pipes. Therefore, taking a similar "vertical coke oven" as an example, the gas collecting pipes can be hoisted in the following ways: ① Hoisting after assembly beneath the oven. Large coke ovens are generally assembled in pairs beneath the oven. Several assembly brackets are placed on a flat surface, and the gas collecting pipes are welded and assembled. After the roof on top of the coke oven is removed, a crane is used for segmented hoisting. For shorter gas collecting pipes, integral hoisting can be selected. ② Segmented hoisting using a crane in a masonry greenhouse. If the greenhouse crane has sufficient height and rated weight, a crane can be used for segmented hoisting. However, because the heat recovery coke oven structure differs slightly from that of a vertical coke oven, a permanent coke oven greenhouse is used for masonry installation. Whether hoisting in whole or in segments is affected by the greenhouse columns and roof panels, requiring the removal of large areas of the permanent greenhouse columns or roof, rain protection of the coke oven body is difficult to ensure, and the construction period is long. Furthermore, the greenhouse lacks a crane, making segmented hoisting impossible using a crane. Through analysis, it can be seen that the existing technology for the installation of heat recovery coke oven gas collecting pipes has various shortcomings. Therefore, it is very necessary to propose an installation method with high safety factor, low operation difficulty, fast construction speed and low construction cost. Summary of the Invention

[0004] The purpose of the present invention is to provide a safe, reliable and clean method for installing a heat recovery coke oven gas collecting pipe.

[0005] To achieve the above objectives, the technical solution of the present invention is:

[0006] A method for installing a clean heat recovery coke oven gas collecting pipe comprises a gas collecting pipe on the coke oven machine side and a coke oven side, a gas collecting pipe support bracket being provided at the bottom of the gas collecting pipe, a side surface of the gas collecting pipe being radially connected to a plurality of bridge pipes, a side surface of the bridge pipe being radially connected to a riser pipe, and a riser pipe being connected to a coke oven carbonization chamber. The method is characterized by comprising the following steps:

[0007] a. According to the design of the permanent greenhouse roof structure, the roof of the planned hoisting area is integrated;

[0008] b. The gas collecting pipe is manufactured in sections, and the lifting length of the section nodes should be reasonably distributed, while avoiding the connection with the bridge pipe;

[0009] c. Preparation for gas collecting pipe installation, including the following steps:

[0010] (1) Demolition of the secondary span of a permanent greenhouse;

[0011] (2) The installation of gas gathering pipe supports and riser pipes, and bridge pipes should be carried out after the holes are opened;

[0012] (3) Remove the entire roof of the hoisting area corresponding to the gas collecting pipe section;

[0013] d. Gas collecting pipe installation operation includes the following steps:

[0014] (1) The gas collecting pipe section is hoisted vertically through the ridge line of the greenhouse and hoisted into the greenhouse through the hoisting area;

[0015] (2) The gas collecting pipe section rotates 90° and then falls onto the pipe support;

[0016] (3) Reinstall the gas collecting pipe section to the roof of the corresponding hoisting area as a whole;

[0017] e. Repeat the steps of dismantling the roof and installing the gas collecting pipes in the corresponding hoisting area to complete the installation of all pipe sections.

[0018] f. After all pipe sections are hoisted and assembled, they are welded;

[0019] g. Complete the opening at the connection between the gas collecting pipe and the bridge pipe according to the relative positions of the pipeline, furnace body and riser.

[0020] The clean heat recovery coke oven gas collecting pipe installation method of the present invention can also be further implemented by adopting the following technical measures.

[0021] In the aforementioned method, an annular refractory lining is provided on the inner wall of the gas collecting pipe.

[0022] In the aforementioned method, the greenhouse roof is removed in the area of ​​the greenhouse roof hoisting passage to serve as a passage for hoisting the gas collecting pipe section.

[0023] In the above-mentioned method, the roof of the hoisting area is integrated into a plurality of greenhouse roof hoisting channel areas and non-demolished roof areas at irregular intervals on both sides of the greenhouse ridge line according to the length and diameter of a single gas collecting pipe.

[0024] In the aforementioned method, the number of the bridge tubes is 21.

[0025] In the aforementioned method, the gas gathering pipe support is a bracket placed on the top of the furnace column.

[0026] In the aforementioned method, the gas collecting pipe is composed of four sections of pipes with different diameters connected together.

[0027] After adopting the above technical solution, the clean heat recovery coke oven gas collecting pipe installation method of the present invention has the following advantages:

[0028] 1. In the early stage of installation, the roof design of the hoisting area is deepened to avoid large-scale demolition of the coke oven shed, which is convenient for timely demolition and installation, saving construction time and costs;

[0029] 2. The length of a single section of the gas collecting pipe is appropriately adjusted, eliminating the need for large cranes, making construction resource allocation convenient and increasing safety.

[0030] 3. Install the riser before installing the gas collecting pipe to improve the accuracy and quality of the opening at the connection between the gas collecting pipe and the bridge pipe. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 Schematic diagram of the gas collecting pipe installation structure according to an embodiment of the present invention.

[0032] In the figure: 1 column, 2 gas collecting pipe, 3 gas collecting pipe opening, 4 lifting area, 5 roof area that will not be demolished. DETAILED DESCRIPTION

[0033] The present invention will be further described below with reference to the embodiments and the accompanying drawings.

[0034] Example 1

[0035] The steel mill's new clean heat recovery ramming coke oven project features 16 coke ovens, each equipped with a gas collector on either side of the coke oven. The collector is a circular tube welded from steel plates with a refractory lining. It is mounted on brackets atop the oven columns and connected to the coke oven's carbonization chamber via risers and bridge pipes. A single collector is 87,410 mm long and consists of four sections of pipe with different diameters: 20,350 mm (φ1,960 mm), 21,010 mm (φ2,380 mm), 21,500 mm (φ2,730 mm), and 24,540 mm (φ2,960 mm). Twenty-one bridge pipe connections are required throughout the collector. The permanent coke oven roof is a 20-span lightweight steel structure supported by columns.

[0036] The clean heat recovery coke oven gas collecting pipe installation method of the present invention describes the specific implementation process by using the machine-side gas collecting pipe hoisting operation.

[0037] Please refer to Figure 1 , Figure 1 The following is a schematic diagram of the gas collecting pipe installation structure according to an embodiment of the present invention. As shown in the figure, the gas collecting pipe installation method includes the following steps:

[0038] Step 1: Deepen the permanent greenhouse roof structure and install the 1st / 4th / 6th / 9th / 11th / 14th / 17th spans of the machine side hoisting area 4 roof as a whole. The roof area 5 corresponding to the hoisting area 4 will not be demolished.

[0039] Step 2: The gas collecting pipe is manufactured in 4 sections, each pipe diameter section is divided into 2 sections, and the entire gas collecting pipe is divided into 8 shell sections.

[0040] Step 3: Dismantle the permanent greenhouse sub-span; install the pipe supports and risers.

[0041] Step 4: Remove the entire first span of the roof in the machine side hoisting area.

[0042] Step 5. The first section of the gas collecting pipe shell is hoisted into the greenhouse through the hoisting area perpendicular to the ridge line of the greenhouse. The first section of the shell is rotated 90° and placed on the pipe bracket.

[0043] Step 6: Reinstall the first span of the roof in the machine side hoisting area as a whole.

[0044] Step 7. Repeat steps 4, 5, and 6 to complete the installation of the second to eighth sections of the gas collecting pipe shell.

[0045] Step 8: Assemble and weld.

[0046] Step 9: According to the relative position of the gas collecting pipe opening 3 and the furnace body and the riser, the gas collecting pipe and the bridge pipe connection hole are drilled to complete the gas collecting pipe installation.

[0047] The present invention has substantial characteristics and significant technological advancements. The clean heat recovery coke oven gas collecting pipe installation method of the present invention has the following advantages over existing construction methods:

[0048] 1. This installation method does not require large-scale demolition of the permanent greenhouse of the coke oven; it saves construction time and costs.

[0049] 2. This installation method will further design the roof of the intended hoisting area as a whole before the initial installation, which will facilitate the removal and installation of the subsequent gas collecting pipe installation, saving construction time and costs.

[0050] 3. After the gas collecting pipe is divided into sections by this installation method, the length of a single section of the gas collecting pipe is relatively short and the weight is light, so no large crane is required. The construction resource allocation is convenient and the safety factor is high.

[0051] 4. This installation method installs the riser before the gas collecting pipe, which helps to reduce the influence of errors caused by furnace body masonry and riser installation. The gas collecting pipe opening is installed after hoisting and assembly, which helps to improve the accuracy and quality of the opening at the connection between the gas collecting pipe and the bridge pipe.

[0052] 5. This installation method installs the entire roof of the installation area immediately after the gas collecting pipe section is hoisted. This helps to reduce the impact of rain on the furnace refractory materials during the installation process.

[0053] The above embodiments are intended to illustrate the present invention only and are not intended to limit the present invention. Persons skilled in the art may make various modifications or variations without departing from the spirit and scope of the present invention. Therefore, all equivalent technical solutions are intended to fall within the scope of the present invention and are defined by the claims.

Claims

1. A method for installing a clean heat recovery coke oven gas collecting pipe, comprising a gas collecting pipe on the coke oven machine side and a coke oven side, with a gas collecting pipe support bracket provided at the bottom of the gas collecting pipe, the side surfaces of the gas collecting pipe being radially connected to a plurality of bridge pipes, the side surfaces of the bridge pipes being radially connected to riser pipes, and the riser pipes being connected to the coking chamber of the coke oven, characterized in that The following steps are involved: a. According to the design of the permanent greenhouse roof structure, the roof of the planned hoisting area is integrated; b. The gas collecting pipe is manufactured in sections, and the lifting length of the section nodes should be reasonably distributed, while avoiding the connection with the bridge pipe; c. Preparation for gas collecting pipe installation, including the following steps: (1) Demolition of the secondary span of a permanent greenhouse; (2) The installation of gas gathering pipe supports and riser pipes, and bridge pipes should be carried out after the holes are opened; (3) Remove the entire roof of the hoisting area corresponding to the gas collecting pipe section; d. Gas collecting pipe installation operation includes the following steps: (1) The gas collecting pipe section is hoisted vertically through the ridge line of the greenhouse and hoisted into the greenhouse through the hoisting area; (2) The gas collecting pipe section rotates 90° and then falls onto the pipe support; (3) Reinstall the gas collecting pipe section to the roof of the corresponding hoisting area as a whole; e. Repeat the steps of dismantling the roof and installing the gas collecting pipes in the corresponding hoisting area to complete the installation of all pipe sections. f. After all pipe sections are hoisted and assembled, they are welded; g. Complete the opening at the connection between the gas collecting pipe and the bridge pipe according to the relative positions of the pipeline, furnace body and riser.

2. The clean heat recovery coke oven gas collecting pipe installation method according to claim 1, characterized in that: An annular refractory lining is provided on the inner wall of the gas collecting pipe.

3. The clean heat recovery coke oven gas collecting pipe installation method according to claim 1, characterized in that: The greenhouse roof hoisting passage area is dismantled to serve as a passage for hoisting the gas collecting pipe section.

4. The clean heat recovery coke oven gas collecting pipe installation method according to claim 1, characterized in that: The roof of the hoisting area is integrated into a plurality of greenhouse roof hoisting channel areas and non-dismantled roof areas at irregular intervals on both sides of the greenhouse ridge line according to the length and diameter of a single gas collecting pipe.

5. The clean heat recovery coke oven gas collecting pipe installation method according to claim 1, characterized in that: The number of the bridge pipes is 21.

6. The clean heat recovery coke oven gas collecting pipe installation method according to claim 1, characterized in that: The gas collecting pipe support is a bracket placed on the top of the furnace column.

7. The clean heat recovery coke oven gas collecting pipe installation method according to claim 1, characterized in that: The gas collecting pipe is composed of four sections of pipes with different diameters.

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