Construction method of desulfurization and denitrification flue gas pipeline and purification tower body connector

Abstract

The application is a construction method of a desulfurization and denitration flue gas pipeline and a purification tower body connecting piece; characterized by comprising determining the position of the connecting point of the purification tower body and the bell mouth; installing the bell mouth, segmenting the vertical pipe according to the diameter, and installing the flue gas vertical pipe by using a truck crane; after the installation of the bell mouth and the flue gas pipeline vertical pipe is completed, the connecting part is reinforced and supplemented, kerosene penetration test is conducted on all the welds to ensure that all the welds meet the design requirements; after the weld construction is completed, the steel plate at the connecting position of the vertical pipe and the bell mouth needs to be cut off, and the cutting sequence of the steel plate is from top to bottom; after the steel plate at the connecting position of the bell mouth and the purification tower body is cut off, the construction of the flue gas pipeline and the purification tower body connecting piece is completed, and all the welds are detected to ensure that the weld quality meets the design requirements.

Description

TECHNICAL FIELD

[0001] The present application relates to the construction technology field of industrial furnaces, in particular to the connecting component of the two independent units of the flue gas pipeline and the tower body of the purification tower, and specifically relates to a construction method of a desulfurization and denitrification flue gas pipeline and a purification tower body connecting component. BACKGROUND

[0002] The coking industry is an important part of the coal chemical industry and is one of the most important upstream industries in the steel industry. The main pollutants of the coking industry are sulfur dioxide and ammonia oxides. The main removal method is solid adsorption (activated carbon adsorption).

[0003] The principle of the solid adsorption (activated carbon adsorption) method is to discharge the flue gas through the flue gas pipeline into the purification tower, and the activated carbon in the tower performs adsorption to achieve the purpose of desulfurization and denitrification. The rapid communication of the flue gas pipeline and the purification tower determines the ventilation of the flue gas, which indirectly affects the production of the coke oven. The traditional construction method is to first weld the flue gas pipeline standpipe and the standpipe and tower body connecting component (hereinafter referred to as the bell mouth) and then perform butt welding with the purification tower body. Due to the construction error, the construction position of the connecting component deviates from the design position, which causes the actual construction on site to fail to meet the design requirements, and there are many rework phenomena, which affects the construction efficiency and causes waste of construction cost. The construction method of the desulfurization and denitrification flue gas pipeline and the purification tower body connecting component can effectively avoid the above problems. SUMMARY

[0004] The purpose of the present application is to solve the problem of difficult air butt joint construction of the desulfurization and denitrification flue gas pipeline standpipe and the purification tower body.

[0005] In order to achieve the above purpose, the present application is implemented as follows: a construction method of a desulfurization and denitrification flue gas pipeline and a purification tower body connecting component, comprising

[0006] Step 1, determining the position of the connecting point of the purification tower body and the bell mouth according to the requirements of the flue gas pipeline plan layout, elevation layout and design drawing;

[0007] Step 2, installing the bell mouth according to the installation schematic diagram of the bell mouth, and sequentially constructing the bell mouth from bottom to top using a 25t automobile crane; wherein,

[0008] Step 2.1, according to the drawing, dividing the bell mouth into three layers from top to bottom at the corresponding position of the purification tower body, with 4 bell mouths in the uppermost layer, 5 bell mouths in the middle layer, and 5 bell mouths in the lowermost layer, totaling 14 bell mouth positions;

[0009] Step 2.2, preferentially positioning the bell mouth at the position of the purification tower body;

[0010] Step 2.3, using a 25t truck crane to hoist the trumpet from the ground to the air trumpet at the position of the purification tower body, and weld it together with the purification tower body;

[0011] Step 3, when the flue gas pipe riser is a variable-diameter riser, the riser is segmented according to the diameter, specifically, the flue gas pipe riser is processed according to the design drawings, and the riser is segmented 200mm upward at the variable-diameter position during deepening; a 50t truck crane is used to install the flue gas riser; wherein,

[0012] Step 3.1, according to the drawings, the flue gas pipe is installed in sections, divided into 3 sections;

[0013] Step 3.2, the flue gas pipe installation sequence is from bottom to top and section by section,

[0014] Step 3.3, using a 50t truck crane to hoist the first section of the flue gas riser from the ground to the air, change it to a vertical state, and butt joint and weld with the horizontal main pipe, and weld the vertical direction with the lowermost trumpet to form a stable unit;

[0015] Step 3.4, the second section of the flue gas riser is hoisted from the ground to the air, changed to a vertical state, butt joint and welded with the first section of the riser, and welded with the intermediate layer trumpet in the vertical direction to form a stable unit;

[0016] Step 3.5, the third section of the flue gas riser is hoisted from the ground to the air, changed to a vertical state, butt joint and welded with the second section of the riser, and welded with the uppermost trumpet in the vertical direction to form a stable unit. After installation is completed, kerosene penetration test is conducted on all welds to detect the quality of the welds;

[0017] Step 4, after the installation of the trumpet and the flue gas pipe riser is completed, the connecting part is reinforced and welded, and kerosene penetration test is conducted on all welds to ensure that all welds meet the design requirements;

[0018] Step 5, after the completion of the weld construction, the steel plate at the connection between the riser and the trumpet needs to be cut off, and the cutting sequence of the steel plate is from top to bottom;

[0019] Step 6, the steel plate at the connection between the trumpet and the purification tower body is cut off. Before the trumpet construction, the purification tower body and the internal structure construction are completed, and the inside of the purification tower cannot be accessed. During the cutting process, the steel plate cutting debris cannot fall into the inside of the purification tower. Before cutting, the steel plate is divided and numbered, and after cutting, the cut steel plate is laid according to needs; ensure that the cut steel plate does not fall into the purification tower;

[0020] Step 7, after the completion of the flue gas pipe and the purification tower body connecting piece construction, all welds are detected to ensure that the weld quality meets the design requirements.

[0021] Compared with the traditional construction method, the installation sequence of the technology is that one end of the bell mouth is first installed on the purification tower body, and then the flue gas vertical pipe is welded in air butt joint with the other end of the bell mouth. The existing method is that the bell mouth is welded with the flue gas vertical pipe on the ground first, and then hoisted up to be welded and installed with the purification tower body in air. The construction method proposed in the application effectively avoids the case that the bell mouth and the flue gas vertical pipe and the purification tower body are deviated from the design due to processing errors; the operation efficiency can be greatly improved, and the one-time qualified rate of the air butt joint construction of the flue gas vertical pipe reaches 100%. When in use, the structure performance and the use performance of the purification tower body and the flue gas pipe are not affected. The construction period is guaranteed, the construction method is optimized, the construction cost is saved, and the high recognition of the owner is obtained. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 Connection point diagram of the purification tower body and the bell mouth.

[0023] Figure 2 Construction diagram of the bell mouth.

[0024] Figure 3 Construction diagram of the flue gas pipe vertical pipe installation.

[0025] Figure 4 Welding seam construction diagram.

[0026] Figure 5 Construction diagram of the bell mouth and the vertical pipe connection steel plate cutting.

[0027] Figure 6 Construction diagram of the bell mouth and the purification tower connection steel plate cutting. DETAILED DESCRIPTION

[0028] The application is further illustrated below through specific embodiments.

[0029] A construction method of a desulfurization and denitrification flue gas pipe and a purification tower body connecting piece, comprising

[0030] Step 1, the position of the bell mouth and the purification tower body connecting point is determined according to the flue gas pipe plane layout, elevation layout and design drawing requirements, see Figure 1 .

[0031] Step 2, the bell mouth is installed according to the bell mouth installation diagram, and the bell mouth is constructed in sequence from bottom to top using a 25t automobile crane. Figure 2

[0032] ​Step 3, the smoke pipe riser of this project is a variable-diameter riser, and the riser diameter is divided into three diameter sections, A1800, A1400, and A1000. According to the design drawings, the smoke pipe riser is processed and deepened; to ensure that the air connection construction of the smoke pipe riser is 100% qualified at one time. When deepening, the smoke pipe riser is segmented upward by 200mm at the variable-diameter position. A 50t truck crane is used to install the smoke riser, and the segmented construction drawing is shown in Figure 3 , in particular:

[0033] Step 3.1, according to the drawings, the smoke pipe is installed in segments, divided into 3 segments;

[0034] Step 3.2, the smoke pipe installation sequence is installed from bottom to top in segments,

[0035] Step 3.3, use a 50t truck crane to lift the first segment of the smoke riser from the ground, change it to a vertical state in the air, and connect and weld with the horizontal mother pipe, weld the vertical direction with the lowermost horn mouth together to form a stable unit;

[0036] Step 3.4, the second segment of the smoke riser is lifted from the ground, changed to a vertical state in the air, connected and welded with the first segment of the riser, and welded together in the vertical direction with the middle layer horn mouth to form a stable unit;

[0037] Step 3.5, the third segment of the smoke riser is lifted from the ground, changed to a vertical state in the air, connected and welded with the second segment of the riser, and welded together in the vertical direction with the uppermost horn mouth to form a stable unit. After installation is completed, kerosene penetration test is performed on all welds to detect the quality of the welds.

[0038] Step 4, after the horn mouth and the smoke pipe riser are installed, the connecting part is reinforced and welded, and kerosene penetration test is performed on all welds to ensure that all welds meet the design requirements. See Figure 4 .

[0039] Step 5, after the weld construction is completed, the steel plate at the connection between the riser and the horn mouth needs to be cut off to facilitate the later smoke penetration. Due to the limited construction space of the horn mouth with a height of only 800mm, there is a certain safety risk. Therefore, when cutting the steel plate, an air blower needs to be set up inside the horn mouth to ensure air circulation and personnel safety. The sequence of cutting the steel plate is from top to bottom (see Figure 5 ), and during construction, no one is allowed to work inside the smoke pipe to prevent personnel injury during construction.

[0040] Step 6, after the steel plate at the connection between the riser and the bell mouth is cut, before the bell mouth is constructed, the tower body and the internal structure of the purification tower are constructed, and the inside of the purification tower cannot be accessed. The steel plate at the connection between the bell mouth and the tower body of the purification tower is cut, and it is necessary to pay attention to that the cut pieces of the steel plate cannot fall into the inside of the purification tower during the cutting process. The steel plate is divided and numbered before cutting, and the cut steel plate is laid according to the requirement after cutting. It is ensured that the cut steel plate does not fall into the inside of the purification tower. The area of the cut steel plate is shown in Figure 6 .

[0041] Step 7, after the flue gas pipeline and the tower body connecting piece of the purification tower are constructed, all the welds are detected to ensure that the weld quality meets the design requirement.

[0042] Compared with the traditional construction method, the installation sequence of the construction method is that one end of the bell mouth is first installed on the tower body of the purification tower, and then the flue gas riser is welded in the air at the other end of the bell mouth. The existing method is that the bell mouth is welded on the ground before the flue gas riser, and then hoisted to be welded and installed on the tower body of the purification tower in the air.

[0043] The construction method can effectively avoid the situation that the connection between the bell mouth and the flue gas riser and the tower body of the purification tower deviates from the design requirement due to the machining error, can greatly improve the work efficiency, and the one-time qualified rate of the air butt joint construction of the flue gas riser reaches 100%. When in use, the structure performance and the use performance of the tower body of the purification tower and the flue gas pipeline are not affected. The construction period is ensured, the construction method is optimized, the construction cost is saved, and the owner highly recognizes it.

Claims

1. A construction method for connecting the desulfurization and denitrification flue gas pipeline to the purification tower body, characterized in that: include Step 1: Determine the location of the connection point between the purification tower body and the bell mouth according to the requirements of the flue gas duct layout plan, elevation layout plan and design drawings; Step 2: Install the flared end according to the installation diagram. Use a 25t truck crane to install the flared end sequentially from bottom to top. in, Step 2.1: According to the drawings, divide the positions of the horn openings on the purification tower body into three layers from top to bottom: 4 on the top layer, 5 in the middle layer, and 5 on the bottom layer, for a total of 14 horn opening positions. Step 2.2: Prioritize locating the position of the horn opening within the purification tower body; Step 2.3: Use a 25t truck crane to lift the horn from the ground to the air position where the horn is located on the purification tower body, and weld it together with the purification tower body; Step 3: When the flue gas riser is a reducing riser, the riser is divided into sections according to the diameter. Specifically, the flue gas riser is processed in detail according to the design drawings. During the processing, the riser is divided into sections 200mm upwards at the diameter change point. A 50t truck crane is used to install the flue gas riser. in, Step 3.1: Install the flue gas duct in sections according to the drawings, dividing it into 3 sections; Step 3.2: The flue gas duct is installed section by section from bottom to top. Step 3.3: Use a 50t truck crane to lift the first section of flue gas riser from the ground, so that it becomes vertical in the air, connects and welds it to the horizontal main pipe, and welds it vertically to the lowest bell mouth to form a stable unit. Step 3.4: The second flue gas riser is hoisted from the ground and becomes vertical in the air. It is then connected and welded to the first riser and welded vertically to the flared end of the middle layer to form a stable unit. Step 3.5: The third flue gas riser is hoisted from the ground and becomes vertical in the air. It is then connected and welded to the second riser and welded vertically to the uppermost bell mouth to form a stable unit. After installation, a kerosene penetration test is conducted on all welds to check the weld quality. Step 4: After the bell mouth and flue gas riser are installed, reinforce the connection parts by welding, and conduct kerosene penetration test on all welds to ensure that all welds meet the design requirements. Step 5: After the weld construction is completed, the steel plate at the connection between the riser and the bell mouth needs to be cut off. The steel plate should be cut off in the order of construction from top to bottom. Step 6: Cut off the steel plate at the connection between the bell mouth and the purification tower body. Before the bell mouth construction, the purification tower body and internal structure must be completed, and the inside of the purification tower must be inaccessible. During the cutting process, steel plate fragments must not fall into the purification tower. Before cutting, the steel plates should be divided and marked with serial numbers. After cutting, the cut steel plates should be laid out as needed. Ensure that the cut steel plates do not fall into the purification tower. Step 7: After the construction of the connection between the flue gas duct and the purification tower body is completed, all welds are inspected to ensure that the weld quality meets the design requirements.

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