Central spiral limited elasticity superheater

Abstract

The utility model relates to the technical field of energy conservation and environmental protection, in particular to a central spiral limited elastic superheater which comprises a central downcomer, a steam head, a spiral turbulent flow heat exchange tube and a plurality of elastic support turbulent flow pieces. The central downcomer and the spiral turbulent flow heat exchange tube are connected with the steam head; the plurality of elastic bracket turbulent flow sheets are fixed on the spiral turbulent flow heat exchange tube; the spiral heat exchange tube comprises a plurality of circles of spiral tubes; the elastic support spoiler comprises a large arc piece, the two ends of the large arc piece extend outwards along the same horizontal plane to form a first straight plate and a second straight plate, and the first straight plate and the second straight plate are welded and fixed to every two adjacent spiral pipes respectively. Saturated steam flows into the central downcomer through the saturated steam pipeline, flows out through the steam head and the spiral turbulent flow heat exchange pipe, and is changed into superheated steam to be output. According to the utility model, the superheater is arranged in the riser to recover sensible heat of high-temperature airflow in the center of the raw gas, and saturated steam is heated into superheated steam to be output and utilized, so that the waste heat utilization efficiency of the raw gas is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of energy conservation and environmental protection, in particular to a central spiral limited elastic superheater. Background Art

[0002] During the coke oven production process, a large amount of raw gas is generated in the carbonization chamber. This raw gas contains organic compounds such as tar, benzene, and naphthalene. Each carbonization chamber corresponds to a riser. The raw gas temperature ranges from 650°C to 750°C. The current method for recovering heat energy is to replace ordinary risers with riser heat exchangers. This typically reduces the raw gas temperature to 500°C, recovering some of the heat for use. However, the surrounding hot air flow recovered by the riser is high-temperature sensible heat, and the heat energy in the center of the air flow remains unused, resulting in a waste of resources and low efficiency in utilizing the waste heat of the raw gas. Utility Model Content

[0003] In response to the deficiencies in the prior art, the utility model provides a central spiral limited elastic superheater that can recover the sensible heat of the central high-temperature airflow of raw gas, heat the saturated steam into superheated steam for output utilization, and improve the utilization efficiency of the waste heat of raw gas.

[0004] To achieve the above objectives, the specific technical solutions are as follows:

[0005] A central spiral limited elastic superheater includes a central downcomer, a steam header, a spiral turbulent heat exchange tube and a plurality of elastic support spoilers; the central downcomer and the spiral turbulent heat exchange tube are both connected to the steam header, and the plurality of elastic support spoilers are fixed on the spiral turbulent heat exchange tube.

[0006] Furthermore, the steam head is cylindrical, including an upper ball head and a lower ball head, and the upper ball head is provided with two openings, a first opening located directly above, and a second opening located slightly to the left.

[0007] Furthermore, the central downcomer includes a steam inlet pipe and a downcomer straight pipe, which are integrally arranged to form a whole. The lower outlet of the downcomer straight pipe leads to the first opening of the steam head, close to the lower spherical head.

[0008] Furthermore, the spiral turbulent heat exchange tube includes a connecting tube, a spiral heat exchange tube, a vertical tube and a steam outlet pipe which are connected in sequence; the end outlet of the connecting tube leads to the second opening of the steam head.

[0009] Furthermore, the spiral heat exchange tube includes multiple turns of spiral tubes, and the distance between the spiral tubes is 114-152 mm.

[0010] Furthermore, the spiral heat exchange tube is coiled outside the descending straight tube, the lower part of the steam inlet pipe is arranged parallel to the vertical pipe, and a fixing plate is fixed between the lower part of the steam inlet pipe and the vertical pipe; the upper pipe opening of the steam inlet pipe and the pipe opening of the steam outlet pipe are arranged in different directions.

[0011] Furthermore, the elastic support spoiler is integrally arranged, including a large arc piece, and straight plates 1 and 2 are extended outward at both ends of the large arc piece along the same horizontal plane. The straight plates 1 and 2 have the same structure, and the large arc piece forms an arc-shaped transition with the straight plates 1 and 2 respectively; the straight plates 1 and 2 of the elastic support spoiler are respectively vertically fixedly connected to each two adjacent spiral tubes, and the angle between the two ends of the large arc piece and the plane where the spiral tube is located is 60°; the multiple elastic support spoilers are arranged in two straight lines and fixed on the spiral heat exchange tube symmetrically with the center.

[0012] Furthermore, it also includes a short circular tube, on both ends of which an upper circular body and a lower circular body are radially arranged; the upper circular body and the lower circular body are circumferentially evenly distributed with multiple bolt holes that cooperate with the flange of the riser; the upper pipe opening of the steam inlet pipe and the pipe opening of the steam outlet pipe respectively pass through the short circular tube to the outside.

[0013] Furthermore, it also includes a high temperature resistant bracket 1 and a high temperature resistant bracket 1; one end of the high temperature resistant bracket 1 and the high temperature resistant bracket 1 are respectively fixed on the lower part of the vertical pipe and the steam inlet pipe, and the other end of the high temperature resistant bracket 1 and the high temperature resistant bracket 1 are both fixed on the inner wall of the short round tube.

[0014] Furthermore, the central downcomer is made of 310S material or TP310 material, with an outer diameter of 38 mm and a wall thickness of 3.5 mm; the spiral turbulent heat exchange tube is made of 310S material or TP310 material; the diameter of the spiral heat exchange tube after coiling is larger than the diameter of the steam head; the metal surface of the superheater is coated with high-temperature resistant infrared paint.

[0015] The beneficial effects of the utility model are:

[0016] The utility model installs a superheater in the riser to recover the sensible heat of the central high-temperature airflow of raw gas, superheats the saturated steam to 400℃~450℃, heats the saturated steam into superheated steam for output utilization, and improves the utilization efficiency of the waste heat of the raw gas; the utility model arranges spiral heat exchange tubes and elastic support spoilers, which can violently disturb the central horizontal flow of the raw gas to form a turbulent flow with high heat exchange effect; the spiral coil has a strong turbulent performance on the central raw gas airflow; the arc elastic deformation support plate between the coils not only has a supporting role, but also plays a turbulent role; the entire superheater surface is painted with high-temperature resistant infrared paint, which can increase radiation heat absorption, increase heat recovery effect, and increase steam temperature; the oxygen temperature in the raw gas is 750℃, and the distance between the spiral tubes will be supported by the elastic deformation of the elastic support spoiler, and will be extended and compressed in a small range, without causing large changes, so that the spiral tube structure is stabilized within a small range. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a structural diagram of a central spiral finite elastic superheater of the utility model;

[0018] Figure 2 This is a schematic structural diagram of the steam head in the present utility model;

[0019] Figure 3 This is a schematic diagram of the structure of the elastic bracket spoiler in the utility model;

[0020] Among them, 1. Upper annular body; 2. Lower annular body; 3. Short circular tube; 4. Steam inlet pipe; 5. Downward straight pipe; 6. Steam head; 61. Upper spherical head; 62. Lower spherical head; 63. Cylinder; 64. First opening; 65. Second opening; 7. Connecting pipe; 8. Spiral heat exchange tube; 9. Elastic bracket spoiler; 91. Straight plate 1; 92. Straight plate 2; 93. Arc transition; 94. Large arc plate; 10. Vertical pipe; 11. Fixed plate; 12. High temperature resistant bracket 1; 13. High temperature resistant bracket 2; 14. Steam outlet pipe. DETAILED DESCRIPTION

[0021] In order to better explain the present invention and facilitate understanding, the technical solutions and effects of the present invention are described in detail below with reference to the accompanying drawings through specific implementation methods.

[0022] Example 1, as Figure 1-Figure 3 As shown in the figure, a 7-meter coke oven in a coking plant has a central spiral limited elastic superheater installed in its riser. Low-pressure saturated steam in the plant is introduced and converted into superheated steam for output through heat exchange with the raw coal gas in the riser.

[0023] A central spiral limited elastic superheater includes a central downcomer, a steam header 6, a spiral turbulent heat exchange tube, and multiple elastic support spoilers 9. The central downcomer and the spiral turbulent heat exchange tube are both connected to the steam header 6, and the multiple elastic support spoilers 9 are fixed to the spiral turbulent heat exchange tube. Saturated steam flows from the saturated steam pipe into the central downcomer, passes through the steam header 6, and then flows out through the spiral turbulent heat exchange tube, becoming superheated steam for output.

[0024] Specifically, the steam header 6 is a cylindrical body 63, comprising an upper spherical head 61 and a lower spherical head 62. The upper spherical head 61 is provided with two openings: a first opening 64 located directly above, and a second opening 65 located slightly to the left. The steam header 6 is cast and can break up the raw gas in the riser, providing a turbulent flow.

[0025] The spiral turbulent heat exchange tube comprises a connecting tube 7, a spiral heat exchange tube 8, a vertical tube 10, and a steam outlet pipe 14, all connected in sequence. The outlet end of the connecting tube 7 connects to the second opening 65 of the steam header 6. The central downcomer comprises a steam inlet pipe 4 and a straight descending tube 5, which are integrally arranged to form a single unit. The lower outlet of the straight descending tube 5 connects to the first opening 64 of the steam header 6, near the lower spherical head 62. Saturated steam passes through the straight descending tube 5 of the central downcomer, sprayed toward the lower spherical head 62, passes through the second opening 65, enters the connecting tube 7, and then enters the spiral heat exchange tube 8, gradually forming superheated steam. The central downcomer is made of 310S material, or TP310 material. It has an outer diameter of 38 mm and a wall thickness of 3.5 mm.

[0026] The spiral heat exchange tubes 8 comprise multiple turns of spiral tubes. In this embodiment, the spacing between the tubes is 130 mm. Experimental verification shows that a spacing between 114 and 152 mm achieves optimal flow disturbance, resulting in the highest saturated steam heating temperature. Furthermore, the central flow resistance to the raw gas is 2 Pascals, with a negligible impact on the coke oven gas header pressure. After being broken through the steam header 6, the raw gas is further disturbed by the spiral heat exchange tubes 8, enhancing heat exchange.

[0027] The spiral heat exchange tube 8 is coiled around the outside of the descending straight tube 5. The lower part of the steam inlet pipe 4 is arranged parallel to the vertical pipe 10, and a fixing plate 11 is fixed between the lower part of the steam inlet pipe 4 and the vertical pipe 10 to fix the lower part of the steam pipe 4 and the vertical pipe 10 relative to each other; the upper pipe opening of the steam inlet pipe 4 and the pipe opening of the steam outlet pipe 14 are arranged in different directions.

[0028] The elastic support spoiler 9 is integrally configured and includes a large arc piece 94. Two ends of the large arc piece 94 extend outward along the same horizontal plane, with straight plates 1 and 2, 92, extending outward. Straight plates 1 and 92 are identical in structure, and arc-shaped transitions 93 are formed between the large arc piece 94 and straight plates 1 and 92, respectively. Straight plates 1 and 92 of the elastic support spoiler 9 are welded to each two adjacent spiral tubes, stabilizing the spacing between the spiral tubes. The two ends of the large arc piece 94 form a 60° angle with the plane of the spiral tubes. The large arc piece 94 also has a flow-disturbing effect, improving heat exchange efficiency. The multiple elastic support spoilers 9 are arranged in two straight lines and fixed symmetrically to the spiral heat exchange tube 8. In actual use, under high temperature conditions, the elastic support spoiler 9 will undergo a small degree of elastic deformation, which helps to remove dust from the surfaces of the spiral tubes and the elastic support spoiler 9.

[0029] The superheater also includes a short circular tube 3, with an upper annular body 1 and a lower annular body 2 radially disposed at each end. The upper opening of the steam inlet pipe 4 and the opening of the steam outlet pipe 14 pass through the segmented circular tube 3 to allow steam to enter and exit the exterior. Both the upper annular body 1 and the lower annular body 2 are circumferentially distributed with multiple bolt holes that mate with the flange of the riser. The coke oven riser is equipped with a tee and a water seal base. After the superheater is installed in the riser, the upper annular body 1 is connected to the upper flange of the water seal base, and the lower annular body 2 is connected to the upper flange of the tee, both of which are bolted together through the bolt holes.

[0030] It also includes a high-temperature resistant bracket 12 and a high-temperature resistant bracket 2 13; one end of the high-temperature resistant bracket 12 and the high-temperature resistant bracket 2 13 are respectively fixed on the vertical pipe 10 and the lower part of the steam inlet pipe 4, and the other ends of the high-temperature resistant bracket 12 and the high-temperature resistant bracket 2 13 are both fixed on the inner wall of the short circular tube 3, thereby being able to play the role of fixing the central downcomer and the spiral turbulent heat exchange tube.

[0031] The basic material of the spiral turbulent heat exchange tube is 310S, and TP310 can also be selected. In this embodiment, the diameter of the spiral heat exchange tube 8 after winding is 130 mm, and the diameter of the steam head 6 is 89 mm. The diameter of the spiral turbulent heat exchange tube is larger than the diameter of the steam head 6.

[0032] The entire superheater surface of this embodiment is coated with a high-temperature infrared paint, which increases radiant heat absorption, enhances heat recovery, and raises steam temperature. Finally, a high-temperature stress-relief annealing process is performed in an annealing furnace to eliminate welding and processing stresses and prevent stress-induced deformation of the equipment. The paint cures at high temperatures and does not peel. It also remains resistant to shedding even when stored outdoors, even in rain or snow. The raw gas and saturated steam exchange heat through heat conduction. The spiral tube and elastic support spoiler 9 strongly disturb the central advection of the raw gas, creating a turbulent flow with high heat exchange efficiency.

[0033] The working process of the utility model is as follows: low-temperature steam enters from the steam inlet pipe 4, flows in the central downcomer and the spiral turbulent heat exchange tube, first passes through the central downcomer, then enters the steam header 6, and then moves upward through the spiral turbulent heat exchange tube; the high-temperature heat energy of the central raw gas passes through the central downcomer and the spiral turbulent heat exchange tube, transfers heat to the low-temperature steam, and converts the low-temperature steam into superheated steam for output use.

Claims

1. A central spiral finite elastic superheater, characterized by: It includes a central downcomer, a steam head, a spiral turbulent heat exchange tube and multiple elastic bracket spoilers; the central downcomer and the spiral turbulent heat exchange tube are connected to the steam head, and multiple elastic bracket spoilers are fixed on the spiral turbulent heat exchange tube.

2. A central spiral finite elastic superheater according to claim 1, characterized in that: The steam head is cylindrical and includes an upper ball head and a lower ball head. The upper ball head is provided with two openings, a first opening located directly above, and a second opening located slightly to the left.

3. The central spiral finite elastic superheater according to claim 2, characterized in that: The central downcomer includes a steam inlet pipe and a downcomer straight pipe, which are integrally arranged to form a whole. The lower outlet of the downcomer straight pipe leads to the first opening of the steam head, close to the lower ball head.

4. The central spiral finite elastic superheater according to claim 3, characterized in that: The spiral turbulent heat exchange tube includes a connecting tube, a spiral heat exchange tube, a vertical tube and a steam outlet pipe which are connected in sequence; the end outlet of the connecting tube leads to the second opening of the steam head.

5. The central spiral finite elastic superheater according to claim 4, characterized in that: The spiral heat exchange tube comprises a plurality of spiral tubes, and the spacing between the spiral tubes is 114-152 mm.

6. The central spiral finite elastic superheater according to claim 5, characterized in that: The spiral heat exchange tube is coiled outside the descending straight tube, the lower part of the steam inlet pipe is arranged parallel to the vertical pipe, and a fixing plate is fixed between the lower part of the steam inlet pipe and the vertical pipe; the upper pipe opening of the steam inlet pipe and the pipe opening of the steam outlet pipe are arranged in different directions.

7. The central spiral finite elastic superheater according to claim 5, characterized in that: The elastic support spoiler is integrally arranged, including a large arc piece, and straight plates 1 and 2 are extended outward along the same horizontal plane at both ends of the large arc piece. The straight plates 1 and 2 have the same structure, and the large arc piece forms an arc transition with the straight plates 1 and 2 respectively; the straight plates 1 and 2 of the elastic support spoiler are respectively vertically fixedly connected to every two adjacent spiral tubes, and the angle between the two ends of the large arc piece and the plane where the spiral tube is located is 60°; the multiple elastic support spoilers are arranged in two straight lines and fixed on the spiral heat exchange tube symmetrically.

8. The central spiral finite elastic superheater according to claim 6, characterized in that: It also includes a short circular tube, with an upper circular body and a lower circular body radially arranged at both ends of the short circular tube; multiple bolt holes that cooperate with the flange of the riser are evenly distributed circumferentially on the upper circular body and the lower circular body; the upper pipe opening of the steam inlet pipe and the pipe opening of the steam outlet pipe respectively pass through the short circular tube to the outside.

9. The central spiral finite elastic superheater according to claim 8, characterized in that: It also includes high temperature resistant bracket 1 and high temperature resistant bracket 2; one end of high temperature resistant bracket 1 and high temperature resistant bracket 2 are respectively fixed on the vertical pipe and the lower part of the steam inlet pipe, and the other end of high temperature resistant bracket 1 and high temperature resistant bracket 2 are fixed on the inner wall of the short round tube.

10. The central spiral finite elastic superheater according to claim 6, characterized in that: The central downcomer is made of 310S material or TP310 material, with an outer diameter of 38 mm and a wall thickness of 3.5 mm; the spiral turbulent heat exchange tube is made of 310S material or TP310 material; the diameter of the spiral heat exchange tube after spiraling is larger than the diameter of the steam head; the metal surface of the superheater is coated with high-temperature resistant infrared paint.

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