A steam production and collection system utilizing carbon calcined coke waste heat

Abstract

The utility model provides a kind of steam production and collection system using carbon calcined coke waste heat, and the collection system is constituted by steam pocket, circulating pump, heat exchanger and descending pipeline, ascending pipeline, steam pipeline, water replenishing pipeline, the water replenishing pipeline is connected with the water replenishing interface of steam pocket;The steam pipeline is connected with the steam interface of steam pocket;Wherein: the steam pocket is connected with the one end of circulating pump by descending pipeline;The other end of circulating pump is connected with the water inlet of disc heat exchanger by pipeline;The steam outlet of heat exchanger is connected with the steam pocket by ascending pipeline;Wherein: the heat exchanger is composed of the passage type structure of upper flange, lower flange, shell and outer insulating layer, shell upper portion is welded with upper flange, shell bottom is welded with lower flange;Shell outer portion is laid with outer insulating layer;Shell inner wall is provided with disc type heat exchange unit;The utility model can cool carbon calcined coke, meet the process requirement of anode production, the high-temperature waste heat of calcined coke is recovered to generate steam, which is used for power generation or meets the steam demand of other industries and civil use, and good economic benefit can be obtained.

Description

Technical Field

[0001] This utility model relates to the field of waste heat utilization technology, and more specifically, to a steam production and collection system that utilizes the waste heat of carbon calcination coke. Background Technology

[0002] Calcinated coke is an intermediate product in the production of anode materials. Anode materials, essential for the electrolytic aluminum smelting process, are mainly produced through two stages: calcination and roasting. First, petroleum coke is calcined in a calcining furnace to obtain calcined coke. Then, the calcined coke is cooled, crushed, mixed with asphalt, shaped in a mold, and finally roasted in a roasting furnace. The temperature of the calcined coke discharged from the calcining furnace can reach 1100℃, requiring cooling to below 100℃ before being transported to subsequent storage. Currently, the industry typically uses water-cooled jackets to cool the calcined coke. Open-loop circulating cooling water is introduced into the jacket's outer shell, exchanges heat with the calcined coke, and then returns to the cooling tower for further cooling. However, the waste heat from the calcined coke is not effectively recovered.

[0003] In view of the current state of technology in the industry, this utility model patent provides a system and method for efficiently recovering the waste heat of calcined coke. Utility Model Content

[0004] To address the above issues, this utility model patent provides a steam production and collection system utilizing the waste heat from carbon calcination coke. This system comprises a steam generation device—a heat exchanger, a steam collection system—a steam drum, a circulating pump, and related pipelines such as downcomer pipes, upcomer pipes, steam pipes, and water supply pipes. This utility model solves the problem of high-quality utilization of waste heat and also increases the flexibility and safety of equipment and system operation.

[0005] Specifically, this utility model patent is achieved through the following technical solution:

[0006] A steam production and collection system utilizing the waste heat from carbon calcination coke is disclosed. The collection system comprises a steam drum, a circulating pump, a heat exchanger, and downcomer pipes, riser pipes, steam pipes, and a water supply pipe. The water supply pipe is connected to the water supply interface of the steam drum; the steam pipe is connected to the steam interface of the steam drum. The steam drum is connected to one end of the circulating pump via the downcomer pipe; the other end of the circulating pump is connected to the inlet of the disc heat exchanger via a pipe; the steam outlet of the heat exchanger is connected to the steam drum via the riser pipe. The heat exchanger has a channel-type structure consisting of an upper flange, a lower flange, a shell, and an outer insulation layer. The upper part of the shell is welded to the upper flange, and the bottom of the shell is welded to the lower flange. An outer insulation layer is applied to the exterior of the shell; disc heat exchange units are installed on the inner wall of the shell.

[0007] Furthermore, the disc heat exchange unit consists of a heat exchanger inlet, a coil bundle, and a heat exchanger steam outlet. The coil bundle is located between the heat exchanger inlet and the heat exchanger steam outlet. The coil bundle is made of Φ38×4 20G steel pipe, and the center-to-center distance between the tubes in the coil bundle is 40mm~70mm. The coil bundle starts from the heat exchanger inlet, spirals upward along the inner wall of the heat exchanger's channel-type shell, and ends at the heat exchanger steam outlet. The coil bundle is fixed to the inner wall of the shell by pipe clamps. The pipe clamps are made of Φ10 heat-resistant steel.

[0008] Furthermore, the outer insulation layer is an aluminum silicate blanket with a thickness of 150 mm to 200 mm.

[0009] Furthermore, both the upper flange and the lower flange are made of heat-resistant steel, and the flange thickness is 20mm~40mm.

[0010] Beneficial effects

[0011] 1. Compared with the conventional use of jacketed water cooling jackets to cool calcined coke in the industry, this utility model uses a heat exchanger to recover the waste heat of calcined coke and generate steam, which can effectively utilize the waste heat. The generated steam can be used for power generation, industrial use or civil use, and can obtain economic benefits.

[0012] 2. The temperature of the calcined coke reaches 1100℃. Due to the better flexibility of the heat exchanger, this device can better adapt to the temperature changes of the calcined coke.

[0013] 3. This utility model uses a circulating pump, which can provide power for the steam-water circulation of the heat exchanger, avoid air blockage, and ensure the safe operation of the heat exchanger.

[0014] 4. This invention utilizes the power provided by the circulating pump to enable the coil heat exchanger to generate steam, a steam-water mixture, or hot water, thus improving the heat exchanger's adaptability. Simultaneously, the pressure provided by the circulating pump is greater than the pressure inside the steam drum. Therefore, the steam-water mixture or hot water generated by the heat exchanger, upon returning to the steam space of the steam drum, experiences a rapid pressure drop, causing flash evaporation and increasing steam production.

[0015] 5. Because the circulating pump provides sufficient power, the medium in the coil bundle will always be in a flowing state regardless of its state. This will promptly remove the heat from the calcined coke and ensure that the coil bundle does not overheat, thus preventing damage to the coil bundle due to localized high temperatures.

[0016] 6. Because the circulating pump provides sufficient power, this utility model can increase the circulation rate of steam and water in the heat exchanger, which is beneficial to the generation of steam.

[0017] 7. This utility model adopts a steam drum, the lower space of which can store a large amount of water to supply water to the heat exchanger, while the upper space of the steam drum collects steam, making the system more adaptable to changes in the operating conditions of calcined coke. Attached Figure Description

[0018] Figure 1 This is a system diagram of a steam production and collection system utilizing the residual heat of carbon calcination coke according to this utility model.

[0019] Figure 2 This is a top view of a heat exchanger in a steam production and collection system utilizing the waste heat of carbon calcination coke, according to this utility model.

[0020] Figure label:

[0021] 11. Steam drum; 12. Circulating pump; 13. Heat exchanger;

[0022] 21. Downflow pipe; 22. Upflow pipe; 23. Steam pipe; 24. Water supply pipe;

[0023] 131. Heat exchanger inlet; 132. Coil tube bundle; 133. Heat exchanger steam outlet; 134. Coil tube clamp;

[0024] 135. Upper flange; 136. Lower flange; 137. Shell; 138. External insulation layer. Detailed Implementation

[0025] The following is in conjunction with the appendix Figures 1-2 This utility model patent will be further described.

[0026] A steam production and collection system utilizing the waste heat of carbon calcined coke has two main purposes: first, to cool the calcined coke in the carbon calcining furnace to meet the process requirements of anode production; and second, to recover the high-temperature waste heat of the calcined coke to generate steam for power generation or to meet the steam needs of other industries and civil use, thus achieving good economic benefits.

[0027] like Figure 1 As shown, this utility model provides a steam production and collection system that utilizes the waste heat of carbon calcined coke, which consists of a steam drum 11, a circulating pump 12, a heat exchanger 13, and a downcomer pipe 21, an upcomer pipe 22, a steam pipe 23, and a water supply pipe 24.

[0028] The steam drum 11 is a pressure vessel, with water stored in the lower space and steam collected in the upper space. The working pressure of the steam drum can be set from 0.6 to 1.2 MPa, depending on the purpose of the steam and the requirements of the steam user. Steam is delivered to subsequent users via steam pipeline 23, which is connected to the steam interface at the top of the steam drum. When the water level in the steam drum is lower than the design value, external water is supplied to the steam drum via water supply pipeline 24 and the water supply port interface.

[0029] The steam drum 11 is also provided with a downcomer pipe interface. The water at the bottom of the steam drum is connected to the inlet of the circulating pump 12 via the downcomer pipe 21, and the outlet of the circulating pump 12 is connected to the heat exchanger inlet 131 of the heat exchanger 13 via a pipe.

[0030] The steam drum 11 is also provided with a rising pipe interface, and the heat exchanger outlet 133 of the heat exchanger is connected to the rising pipe interface of the steam drum via the rising pipe 22.

[0031] The heat exchanger 13 has a channel-type structure consisting of an upper flange 135, a lower flange 136, a shell 137, and an outer insulation layer 138. The upper part of the shell 137 is welded to the upper flange 135. The calcined coke enters the heat exchanger 13 from the upper part of the shell 137 and exchanges heat with the coil bundle 132 inside the heat exchanger 13. The bottom of the shell 137 is welded to the lower flange 136. The calcined coke leaves the heat exchanger 13 from the lower part of the shell 137 by gravity. An outer insulation layer 138 is applied to the outside of the shell.

[0032] The disc heat exchanger 13 consists of a heat exchanger inlet 131, a coil bundle 132, and a heat exchanger outlet 133. The coil bundle 132 is located between the heat exchanger inlet 131 and the heat exchanger outlet 133. The coil bundle 132 is a Φ38×4 20G steel pipe. This steel pipe starts from the heat exchanger inlet 131, extends along the inner wall of the heat exchanger's channel structure—the shell 137, and spirals upwards to the heat exchanger outlet 133.

[0033] The coiled tube bundle 132 is fixed to the inner wall of the housing 137 by the coiled tube clamp 134.

[0034] The shell 137 is made of 30mm thick heat-resistant steel plate. Depending on the specific layout of the carbon calcining furnace, the height of the shell 137 is generally 1.8~3.0m. The coiled pipe clamps 134 are made of Φ10 heat-resistant steel bars. The outer insulation layer 138 is an aluminum silicate blanket, 150~200mm thick.

[0035] The above description is only a preferred embodiment of the present utility model patent, but the present utility model patent is not limited to the specific embodiments described above. For those skilled in the art, several modifications and improvements can be made without departing from the inventive concept, and these all fall within the protection scope of the present utility model patent.

Claims

1. A steam production and collection system utilizing the waste heat from carbon calcination coke, characterized in that: The collection system consists of a steam drum (11), a circulating pump (12), a heat exchanger (13), and a downcomer pipe (21), an upcomer pipe (22), a steam pipe (23), and a water supply pipe (24). The water supply pipe (24) is connected to the water supply interface of the steam drum (11); the steam pipe (23) is connected to the steam interface of the steam drum (11); wherein: the steam drum (11) is connected to one end of the circulating pump (12) through the downcomer pipe (21); the other end of the circulating pump (12) is connected to the inlet of the heat exchanger (13) through a pipe. Water inlet connection; the steam outlet of the heat exchanger (13) is connected to the steam drum (11) through the rising pipe (22); wherein: the heat exchanger (13) is a channel structure composed of an upper flange (135), a lower flange (136), a shell (137) and an outer insulation layer (138), the upper part of the shell (137) is welded to the upper flange (135), and the bottom of the shell (137) is welded to the lower flange (136); an outer insulation layer (138) is laid on the outside of the shell (137); a disc heat exchange unit is provided on the inner wall of the shell (137).

2. A steam production and collection system utilizing waste heat from carbon calcination coke according to claim 1, characterized in that: The heat exchanger (13) consists of a heat exchanger inlet (131), a coil tube bundle (132), and a heat exchanger steam outlet (133). The coil tube bundle (132) is located between the heat exchanger inlet (131) and the heat exchanger steam outlet (133). The coil tube bundle (132) is made of Φ38×4 20G steel pipe. The center-to-center distance of the coil tube bundle (132) is 40mm~70mm. The coil tube bundle (132) starts from the heat exchanger inlet (131), extends along the inner wall of the heat exchanger's channel-type shell (137), and spirals upward to the heat exchanger steam outlet (133). The coil tube bundle (132) is fixed to the inner wall of the shell (137) by pipe clamps (134). The pipe clamps are made of Φ10 heat-resistant steel.

3. A steam production and collection system utilizing the waste heat of carbon calcination coke according to claim 1, characterized in that: The outer insulation layer (138) is an aluminum silicate blanket with a thickness of 150mm~200mm.

4. A steam production and collection system utilizing the waste heat of carbon calcination coke according to any one of claims 1-3, characterized in that: The upper flange (135) and the lower flange (136) are both made of heat-resistant steel, and the flange thickness is 20mm~40mm.

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