Double-helix-tube steam cooler for carbon calcined coke
The heat from the calcined coke is converted into steam through a double-spiral steam cooler, which solves the problems of waste heat waste and unbalanced heat exchange in the jacketed heat exchanger, and achieves efficient waste heat utilization and equipment safety improvement.
Patent Information
- Application Number
- CN202420954177.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-04-30
- Publication Date
- 2024-12-24
- Estimated Expiration
- 2034-04-30
AI Technical Summary
In the existing carbon calcined coke cooling process, jacketed heat exchangers lead to waste heat and unbalanced heat exchange, resulting in local high temperatures and equipment damage.
The double-helix tube steam cooler is used to convert the heat from the calcined coke into steam through two double-helix heat exchange tube bundles, achieving efficient waste heat utilization and improving equipment safety.
Effective utilization of high-quality waste heat improves equipment safety and operating performance, avoids local high temperatures and equipment damage, and enhances heat exchange effect and economic returns.
Smart Images
Figure CN222230512U_ABST
Abstract
Description
Technical Field
[0001] The invention relates to the technical field of waste heat utilization, and more specifically to a carbon calcined coke double helical tube steam cooler. Background Art
[0002] The electrolytic aluminum industry needs anode materials as electrodes during the aluminum smelting process. The composition of the anode materials is carbon. At present, petroleum coke is generally calcined at high temperature to remove moisture, volatiles and other chemical residues, and to improve the density, mechanical strength and electrical conductivity of the raw materials. The calcination temperature is 1200-1300℃. After the petroleum coke is calcined in a pot calciner, it is called calcined coke. Due to the high temperature of calcined coke, in the current production process, circulating water is generally used to cool the calcined coke through a jacketed heat exchanger, so that the material is discharged and collected after it is lower than 100℃. After the circulating water is heated, it is cooled by a cooling tower and can be recycled. The jacketed heat exchanger is a heat exchanger made into a sandwich structure. The calcined coke passes through the space surrounded by the inner wall of the sandwich, and cooling water flows between the inner wall and the outer wall of the sandwich.
[0003] The temperature of calcined coke is higher than 1000℃, and the quality of waste heat is high. The current production process only produces hot water, and the hot water also dissipates the absorbed heat into the air in the cooling tower, resulting in a large waste of waste heat. At present, in order to make use of high-quality waste heat, the technical development direction in the industry is to upgrade the jacketed heat exchanger that produces hot water to a tubular heat exchanger that can produce steam.
[0004] The utility model patent CN 210802082 U "A calcined coke hopper steam generator" has the following structure: the water-cooled jacket is provided with an upper header and a lower header, and the upper header and the lower header are connected by dozens of heat exchange tube risers. The calcined coke passes through the hollow structure surrounded by the heat exchange tubes to transfer the heat to the heat exchange tubes. However, this technology has a defect, that is, when the calcined coke is not evenly fed, the heat exchange tubes are heated differently, resulting in different degrees of water vaporization in the heat exchange tubes, resulting in uneven steam-water flow rates, resulting in uneven resistance of each heat exchange tube, resulting in steam-water stagnation in some heat exchange tubes, and the steam-water stagnation cannot take away the heat of the calcined coke in time, causing some heat exchange tubes to generate local high temperatures. In actual production, there have been many cases of local overheating of individual heat exchange tubes, resulting in carbonization of the heat exchange tubes and equipment damage accidents. Utility Model Content
[0005] In view of the above situation, this utility model patent provides a carbon calcined coke double helix tube steam cooler, which converts the heat of calcined coke into steam through two double helical heat exchange tube bundles, thereby achieving energy saving and consumption reduction and promoting production. This utility model can solve the problem of high-quality utilization of waste heat and improve the safe operation performance of equipment.
[0006] Specifically, this utility model patent is implemented through the following technical solutions:
[0007] A carbon calcined coke double helix tube steam cooler is composed of a steam cooler body; the carbon calcined coke double helix tube steam cooler is a trapezoidal shell, the upper part of the shell is provided with a first flange, and the bottom of the shell is provided with a second flange; the inner wall of the shell is connected with a double helix heat exchange tube through a tube clamp; the double helix heat exchange tube is composed of a 1# heat exchange tube bundle and a 2# heat exchange tube bundle; the 1# heat exchange tube bundle is provided with a 1# heat exchange tube bundle water inlet and a 1# heat exchange tube bundle steam outlet; the 2# heat exchange tube bundle is provided with a 2# heat exchange tube bundle water inlet and a 2# heat exchange tube steam outlet; wherein:
[0008] The 1# heat exchange tube bundle water inlet and the 2# heat exchange tube bundle water inlet are both arranged at the lower part of the steam cooler. Cold water enters the heat exchange tube bundle from the 1# heat exchange tube water inlet and the 2# heat exchange tube water inlet at the lower part. The calcined coke enters from the first flange side of the steam cooler, moves from top to bottom by its own weight, and exits the steam cooler from the second flange side after heat exchange with the double helix heat exchange tube, and then enters the subsequent material conveying and collection equipment.
[0009] The water inlet of the 1# heat exchange tube bundle and the 2# heat exchange tube bundle are both arranged at the upper part of the steam cooler. After the working medium water exchanges heat with the calcined coke in the 1# heat exchange tube bundle and the 2# heat exchange tube bundle, it is vaporized into steam and is led out from the steam outlet of the 1# heat exchange tube and the steam outlet of the 2# heat exchange tube to enter the subsequent steam collection equipment.
[0010] Furthermore, the 1# heat exchange tube bundle and the 2# heat exchange tube bundle are flat vertical tube structures; the 1# heat exchange tube bundle and the 2# heat exchange tube bundle are Φ38×4, made of 20G, and the tube center distance between the 1# heat exchange tube bundle and the 2# heat exchange tube bundle is 40mm to 70mm.
[0011] Furthermore, the first flange and the second flange are both made of heat-resistant steel; and the thickness of the first flange and the second flange are both 20 mm to 40 mm.
[0012] Furthermore, the inner diameter width of the first flange is the same as the inner diameter width of the second flange; and the inner diameter length of the first flange is greater than the inner diameter length of the second flange.
[0013] Furthermore, the inner layer of the steam cooler is provided with a heat-insulating layer; the heat-insulating layer is a 140 mm to 160 mm thick aluminum silicate blanket.
[0014] Beneficial Effects
[0015] 1. For the cooling of calcined coke, a jacket-type cooling device was originally used, and circulating water was used to cool the calcined coke. First, the waste heat was not utilized, resulting in energy waste, and second, the problem of efficient utilization of waste heat was not even mentioned. The double helix tube steam cooler described in the present invention is conducive to the efficient utilization of high-quality waste heat. The produced steam can be subsequently used for power generation, heating, air conditioning and refrigeration, and even steam takeaway, turning waste into treasure and obtaining a higher economic return. The utility model adopts a double helix tube heat exchange bundle. Compared with the heat exchanger using dozens of risers, the thermal expansion performance is greatly improved, the thermal stress is reduced, and the safety is improved. Compared with the heat exchanger using dozens of risers, the double helix tube heat exchange bundle is easier to balance the pressure in the bundle, avoiding the possibility of pressure imbalance causing steam and water stagnation in individual bundles, causing local overheating and damage to individual bundles.
[0016] 2. The utility model can greatly improve the safety of equipment operation. Compared with CN 210802082 U "A calcined coke hopper steam generator" which has dozens of heat exchange tubes, only two heat exchange tubes are currently set, which is conducive to maintaining pressure balance. In actual operation, whether the working medium in the two heat exchange tubes is water, a steam-water mixture or steam, when designing the system, as long as the water supply pressure is ensured, the working medium in the heat exchange tube can flow smoothly. As long as the working medium flows smoothly, the heat of the calcined coke can be taken away in time, and local high temperature will not occur, ensuring safety.
[0017] 3. Compared with CN 210802082 U "A calcined coke hopper steam generator", the utility model has dozens of riser heat exchange tubes. When the riser heat exchange tubes expand due to heat, large stress will appear at the connection between the riser and the upper and lower headers. If the welding quality is not up to standard, safety accidents are more likely to occur. The utility model adopts double helical tubes, which will have a certain flexibility when expanded due to heat, and can greatly reduce the expansion stress.
[0018] 4. The heat exchange tubes in the utility model are all Φ38×4, with a net distance of 20mm between tubes. The beneficial effects of this design are: the heat exchange tube diameter is small, and the tube spacing is small, which can increase the heat exchange effect, and can also avoid the accumulation of calcined coke between the heat exchange tubes. The double helical tube steam cooler in the utility model is a flat vertical tube structure, which is conducive to heat transfer and enhances the heat exchange effect. The utility model is firstly conducive to the heat exchange between the calcined coke and the heat exchange tube, and secondly, the inner diameter width of the upper and lower ports is consistent, which ensures that the calcined coke is discharged smoothly and without bulking from the structure, and avoids the accumulation of high-temperature calcined coke, which leads to local high temperature of the heat exchange tube and damages the heat exchange tube; the utility model improves the safety performance of the double helical tube steam cooler.
[0019] 5. The utility model adopts a double spiral tube heat exchange tube bundle. Compared with the heat exchanger using dozens of vertical tubes, the thermal expansion performance is greatly improved, the thermal stress is reduced, and the safety is improved; the pressure in the tube bundle is easier to balance, avoiding the possibility of local overheating and damage to the tube bundle caused by pressure imbalance and steam-water stagnation in the tube bundle.
[0020] 6. The double-helix tube heat exchange bundle of the utility model adopts a flat vertical tube structure, which is conducive to heat transfer and enhances the heat exchange effect; at the same time, the utility model ensures smooth discharge of calcined coke and improves safety performance. BRIEF DESCRIPTION OF THE DRAWINGS
[0021] Figure 1 This is a schematic diagram of the structure of a double-helix tube steam cooler for carbon calcined coke of the utility model;
[0022] Figure 2 It is a top view of the double helical tube steam cooler in the utility model.
[0023] Reference numerals:
[0024] 101, first flange; 102, second flange; 103, shell; 104, pipe clamp; 401, outer insulation layer;
[0025] 201, water inlet of 1# heat exchange tube; 202, tube bundle of 1# heat exchange tube; 203, steam outlet of 1# heat exchange tube;
[0026] 301, water inlet of 2# heat exchange tube; 302, tube bundle of 2# heat exchange tube; 303, steam outlet of 2# heat exchange tube. DETAILED DESCRIPTION
[0027] The following is combined with Figures 1-2 This utility model patent is further elaborated.
[0028] A carbon calcined coke double helix tube steam cooler has the main purpose of cooling the calcined coke from a carbon calcining furnace to meet the production process requirements and further recovering high-quality waste heat to produce steam to obtain greater economic benefits.
[0029] like Figure 1 As shown; the present invention provides a carbon calcined coke double helical tube steam cooler, which is composed of a steam cooler body, wherein the steam cooler is provided with double helical heat exchange tubes and a containment mechanism. The double helical heat exchange tubes include a 1# heat exchange tube water inlet 201, a 1# heat exchange tube bundle 202, a 1# heat exchange tube steam outlet 203, a 2# heat exchange tube water inlet 301, a 2# heat exchange tube bundle 302, and a 2# heat exchange tube steam outlet 303; the containment mechanism includes a first flange 101, a shell 103, a second flange 102, a pipe clamp 104, and an outer insulation layer 401.
[0030] The double helix heat exchange tube is composed of two tube bundles, namely, the 1# heat exchange tube bundle 202 and the 2# heat exchange tube bundle 203. The water inlets (201, 301) of the two heat exchange tube bundles are both arranged at the lower part of the steam cooler. Cold water enters the heat exchange tube bundle (202, 302) from the lower 1# heat exchange tube water inlet 201 and the 2# heat exchange tube water inlet 301. The calcined coke enters from the first flange 101 side of the steam cooler, moves from top to bottom by its own weight, and leaves the steam cooler from the second flange 102 side after heat exchange with the double helix heat exchange tube, and then enters the subsequent material conveying and collecting equipment. After the working medium water exchanges heat with the calcined coke in the 1# heat exchange tube bundle 202 and the 2# heat exchange tube bundle 302, it is vaporized into steam, and is drawn out from the 1# heat exchange tube steam outlet 203 and the 2# heat exchange tube steam outlet 303 to enter the subsequent steam collecting equipment.
[0031] The enclosure mechanism is composed of a first flange 101, a shell 103, a second flange 102, a pipe clamp 104 and an outer insulation layer 401. The size of the first flange 101 corresponds to the size of the discharge port of the calcining furnace after calcination of coke, and is approximately rectangular. The inner diameter width of the second flange 102 is consistent with the inner diameter width of the first flange 101, and the inner diameter length of the second flange 102 is slightly shorter than the inner diameter length of the first flange 101. The shell 103 is surrounded by a 30mm thick heat-resistant steel plate. According to the specific layout of the carbon calcining furnace, the height of the shell 103 is generally 1.8 to 2.5m. The pipe clamp 104 is a Φ10 heat-resistant steel bar, which fixes the 1# heat exchange tube bundle 202 and the 2# heat exchange tube bundle 302 on the shell 103 near the midpoint of the long side of the double helical tube steam cooler. The outer insulation layer 104 is an aluminum silicate blanket, 150mm thick.
[0032] The carbon calcined coke double helical tube steam cooler comprises double helical heat exchange tubes and enclosures; the double helical heat exchange tubes comprise a 1# heat exchange tube water inlet 201, a 1# heat exchange tube bundle 202, a 1# heat exchange tube steam outlet 203, a 2# heat exchange tube water inlet 301, a 2# heat exchange tube bundle 302, and a 2# heat exchange tube steam outlet 303; the enclosure comprises a first flange 101, a shell 103, a second flange 102, a tube clamp 104, and an outer insulation layer 401. The bottom end of the 1# heat exchange tube bundle 202 is welded to the 1# heat exchange tube water inlet 201, and the top end is welded to the 1# heat exchange tube steam outlet 203; the bottom end of the 2# heat exchange tube bundle 302 is welded to the 2# heat exchange tube water inlet 301, and the top end is welded to the 2# heat exchange tube steam outlet 303. The top of the shell 103 is welded to the first flange 101, and the bottom is welded to the second flange 102, together forming the framework of the double helical tube steam cooler. The outer insulation layer 401 is laid along the outer surface of the shell 103 and has a thickness of 150 mm. The 1# heat exchange tube bundle 202 and the 2# heat exchange tube bundle 302 are fixed to the inner wall of the shell 103 at the midpoint of the long side of the double helical tube steam cooler with a heat-resistant steel pipe clamp 104. The end of the pipe clamp 104 is welded to the shell 103. The pipe clamp is a Φ10 heat-resistant steel bar, such as Figure 2 shown.
[0033] The double helix heat exchange tube is composed of two tube bundles, namely, the 1# heat exchange tube bundle 202 and the 2# heat exchange tube bundle 302. The water inlets (201, 301) of the two heat exchange tube bundles are both arranged at the lower part of the steam cooler. Cold water enters the heat exchange tube bundle from the lower 1# heat exchange tube water inlet and the 2# heat exchange tube water inlet. The calcined coke enters from the first flange 101 side of the steam cooler, moves from top to bottom by its own weight, and leaves the steam cooler from the second flange 102 side after heat exchange with the double helix heat exchange tube, and then enters the subsequent material conveying and collecting equipment. After the working medium water exchanges heat with the calcined coke in the 1# heat exchange tube bundle and the 2# heat exchange tube bundle, it is vaporized into steam, and is led out from the 1# heat exchange tube steam outlet and the 2# heat exchange tube steam outlet to enter the subsequent steam collecting equipment.
[0034] The enclosure mechanism is composed of a first flange 101, a shell 103, a second flange 102, a pipe clamp 104 and an outer insulation layer 401. The size of the first flange 101 corresponds to the size of the discharge port of the calcining furnace after calcination of coke, and is approximately rectangular. The inner diameter width of the second flange 102 is consistent with the inner diameter width of the first flange 101, and the inner diameter length of the second flange 102 is slightly shorter than the inner diameter length of the first flange 101. The shell is surrounded by a 30mm thick heat-resistant steel plate. According to the specific layout of the carbon calcining furnace, the height of the shell 103 is generally 1.8 to 2.5m. The pipe clamp is a Φ10 heat-resistant steel bar. The outer insulation layer 401 is an aluminum silicate blanket, 150mm thick.
[0035] The carbon calcined coke double spiral tube steam cooler has two heat exchange tube bundles to complete the main heat exchange process. The water inlet of the 1# heat exchange tube bundle 201 and the water inlet of the 2# heat exchange tube bundle 301 are along the long side of the steam cooler and enter the cooler shell from both sides. After that, the two heat exchange tube bundles (201, 301) are arranged side by side and spirally rise to exchange heat with the calcined coke. The final steam outlets of the two heat exchange tube bundles are also along the long side of the steam cooler to discharge steam from both sides. Both heat exchange tube bundles are Φ38×4, made of 20G, and the tube center distance between the 1# heat exchange tube bundle 201 and the 2# heat exchange tube bundle 301 is 58mm.
[0036] The enclosure structure has a first flange 101 that is approximately rectangular, 30 mm thick, and made of heat-resistant steel. The inner diameter width of the second flange 102 is consistent with the inner diameter width of the first flange 101, and the inner diameter length of the second flange 102 is slightly shorter than the inner diameter length of the first flange 101. The second flange is 30 mm thick and made of heat-resistant steel. The shell 103 is surrounded by a 30 mm thick heat-resistant steel plate, and the shell height is 1.8 to 2.5 m. The pipe clamp is a Φ10 heat-resistant steel bar. The outer insulation layer 401 is a 150 mm thick aluminum silicate blanket.
[0037] The parameters of the carbon calcined coke double helical tube steam cooler are as follows:
[0038] The temperature of calcined coke at the cooler inlet is 1100℃, the temperature of calcined coke at the cooler outlet is 350℃, and the water supply pressure of the cooler is 1.2MPa. The water supply temperature of the cooler is less than 100℃, and the steam pressure at the cooler outlet is 0.8~1.2MPa. When designing the external thermal system, the water supply pressure must be ensured.
[0039] The above is only the preferred implementation of the utility model patent, but the utility model patent is not limited to the above specific implementation. For ordinary technicians in this field, several modifications and improvements can be made without departing from the creative concept, which all fall within the scope of protection of the utility model patent.
Claims
1. A carbon calcined coke double helical tube steam cooler, consisting of a steam cooler body; characterized in that: The carbon calcined coke double helical tube steam cooler is a trapezoidal shell, the upper part of the shell is provided with a first flange, and the bottom part of the shell is provided with a second flange; The inner wall of the shell is connected with a double-helix heat exchange tube through a tube clamp; the double-helix heat exchange tube is composed of a 1# heat exchange tube bundle and a 2# heat exchange tube bundle; the 1# heat exchange tube bundle is provided with a 1# heat exchange tube bundle water inlet and a 1# heat exchange tube bundle steam outlet; the 2# heat exchange tube bundle is provided with a 2# heat exchange tube bundle water inlet and a 2# heat exchange tube steam outlet; wherein: The 1# heat exchange tube bundle water inlet and the 2# heat exchange tube bundle water inlet are both arranged at the lower part of the steam cooler. Cold water enters the heat exchange tube bundle from the 1# heat exchange tube water inlet and the 2# heat exchange tube water inlet at the lower part. The calcined coke enters from the first flange side of the steam cooler, moves from top to bottom by its own weight, and exits the steam cooler from the second flange side after heat exchange with the double helix heat exchange tube, and then enters the subsequent material conveying and collection equipment. The water inlet of the 1# heat exchange tube bundle and the 2# heat exchange tube bundle are both arranged at the upper part of the steam cooler. After the working medium water exchanges heat with the calcined coke in the 1# heat exchange tube bundle and the 2# heat exchange tube bundle, it is vaporized into steam and is led out from the steam outlet of the 1# heat exchange tube and the steam outlet of the 2# heat exchange tube to enter the subsequent steam collection equipment.
2. The carbon calcined coke double helical tube steam cooler according to claim 1, characterized in that: The 1# heat exchange tube bundle and the 2# heat exchange tube bundle are flat vertical tube structures; the 1# heat exchange tube bundle and the 2# heat exchange tube bundle are both Φ38×4, made of 20G, and the tube center distance between the 1# heat exchange tube bundle and the 2# heat exchange tube bundle is 40mm to 70mm.
3. The carbon calcined coke double helical tube steam cooler according to claim 1, characterized in that: The first flange and the second flange are both made of heat-resistant steel; the thickness of the first flange and the second flange are both 20 mm to 40 mm.
4. The carbon calcined coke double helical tube steam cooler according to claim 1, characterized in that: The inner diameter width of the first flange is the same as the inner diameter width of the second flange; the inner diameter length of the first flange is greater than the inner diameter length of the second flange.
5. A carbon calcined coke double helical tube steam cooler according to any one of claims 1 to 4, characterized in that: The inner layer of the steam cooler is provided with a heat-insulating layer; the heat-insulating layer is a 140mm-160mm aluminum silicate blanket.