CN216668340U - Waste heat recovery device of high-temperature alumina roasting furnace - Google Patents
Waste heat recovery device of high-temperature alumina roasting furnace Download PDFInfo
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- CN216668340U CN216668340U CN202123423230.3U CN202123423230U CN216668340U CN 216668340 U CN216668340 U CN 216668340U CN 202123423230 U CN202123423230 U CN 202123423230U CN 216668340 U CN216668340 U CN 216668340U
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Abstract
The utility model provides a waste heat recovery device for a high-temperature alumina roasting furnace, and belongs to the technical field of energy chemical waste heat recovery. The problems that waste heat of the roasting furnace shell is dissipated to the air environment to cause energy waste and the operation environment of workers is deteriorated are solved. The high-temperature aluminum oxide roasting furnace comprises a shell heat conduction device, a circulation pipeline system and a heat user, wherein the shell heat conduction device is arranged on the outer side of the lower conical cylinder of the first roasting furnace, and two ends of the circulation pipeline system are respectively communicated with the shell heat conduction device and the heat user. The waste heat utilization device is mainly used for utilizing waste heat of the outer shell of the roasting furnace, heating residents near a plant area, or heating gas of the roasting furnace, so that the combustion efficiency of the roasting furnace is improved, and the waste heat utilization device can also be used for providing domestic hot water of the plant area.
Description
Technical Field
The utility model belongs to the technical field of energy chemical waste heat recovery, and particularly relates to a waste heat recovery device of a high-temperature alumina roasting furnace.
Background
At present, the suspension state roasting furnace is mainly used as an aluminum hydroxide roasting furnace in China, natural gas and low-calorific-value gas are subjected to diffusion combustion at the preheated air temperature of 600-750 ℃, the temperature of flue gas after combustion is 950-1100 ℃, and the adhering water and crystal water of aluminum hydroxide are removed from high-temperature flue gas, so that aluminum oxide meeting the electrolysis requirement and other purposes is produced. Because a high-temperature roasting process is adopted, the local high-temperature area in the combustion chamber is as high as 1700 ℃, the combustion heat insulation and preservation structure is a heat preservation firebrick and a carbon steel plate from inside to outside, the external temperature of the carbon steel plate is about 130 ℃ when the equipment runs, the carbon steel plate and air adopt a natural convection heat exchange mode in the combustion process, the convection heat exchange strength completely depends on the natural wind speed, and the external temperature of the carbon steel plate can reach 150 ℃ at most in summer with low wind speed.
Because this structure heat dissipation is limited, the high temperature of high temperature surface constitutes the threat to operation personnel's safety, if carry out the surface heat preservation, then will make structural carbon steel plate be in the high temperature state for a long time, can be higher than the highest service temperature of carbon steel plate, can't satisfy the intensity of structure. Meanwhile, if heat preservation is not carried out, a large amount of waste heat is dissipated to the air environment, so that energy waste is caused, and the operating environment of workers is also deteriorated, so that the method has important practical significance on cooling of the shell structure of the roasting furnace and utilization equipment of the waste heat.
SUMMERY OF THE UTILITY MODEL
In view of this, the present invention is directed to provide a waste heat recovery apparatus for a high temperature alumina calcining furnace, so as to solve the problems of energy waste and deterioration of operating environment of workers caused by the waste heat of the calcining furnace casing being dissipated into the air environment.
In order to achieve the purpose, the utility model adopts the following technical scheme:
the waste heat recovery device comprises a shell heat conduction device, a circulation pipeline system and a heat user, wherein the high-temperature alumina roasting furnace comprises a first roasting furnace, the shell heat conduction device is arranged on the outer side of the lower conical cylinder of the first roasting furnace, and two ends of the circulation pipeline system are respectively communicated with the shell heat conduction device and the heat user.
Furthermore, the shell heat conduction device is an interlayer water tank and water-cooling coil pipe structure, the water-cooling coil pipe is located in the interlayer water tank, two ends of the water-cooling coil pipe are respectively communicated with an upper header and a lower header, the interlayer water tank is fixedly connected to the outer side of the first roasting furnace shell, a second safety valve and a second exhaust valve are arranged on the interlayer wall of the interlayer water tank, the interlayer thickness of the interlayer water tank 9 can be designed to be 50-1000mm according to the actual heat dissipation condition, the interlayer can be a normal pressure or a closed water tank, the internal pressure can be judged according to the temperature of the roasting furnace wall at different positions, and the internal pressure is not higher than 3.8 Mpa.
Furthermore, the shell heat conduction device is a heat conduction reinforced contact surface and water-cooling coil pipe structure, the outer wall of the first roasting furnace shell is annularly provided with a surrounding type or vertical type water-cooling coil pipe, a heat conduction reinforced contact surface is arranged between the water-cooling coil pipe and the first roasting furnace shell, the heat conduction reinforced contact surface is tightly pressed by a simple bolt, heat conduction silicone grease is filled in the middle of the heat conduction reinforced contact surface, two ends of the water-cooling coil pipe are respectively communicated with an upper header and a lower header, and the upper header and the lower header are respectively communicated with two ends of the circulation pipeline system.
Furthermore, the shell heat conduction device is of an integral membrane water cooling structure, the first roasting furnace shell structure is a membrane water cooling wall, the refractory insulating bricks in the first roasting furnace are designed according to the surface structure of the water cooling wall, an upper header and a lower header are arranged on the membrane water cooling wall, and the upper header and the lower header are respectively communicated with two ends of the circulating pipeline system.
Furthermore, a temperature measuring device is arranged on the inner wall surface of the shell heat conduction device, and a first safety valve and a first exhaust valve are arranged on the upper header.
Furthermore, a utilization rate adjusting device is arranged on the outer side of the shell heat conduction device.
Furthermore, the circulation pipeline system comprises a user water supply pipeline, a user water return pipeline, an adjusting valve, a third safety valve, a third exhaust valve and a pressurizing circulation pump, one ends of the user water supply pipeline and the user water return pipeline are communicated with a hot user, the other end of the user water supply pipeline is communicated with an upper header, the other end of the user water return pipeline is communicated with a lower header, the adjusting valve, the third safety valve and the third exhaust valve are arranged on the user water supply pipeline, and the adjusting valve and the pressurizing circulation pump are arranged on the user water return pipeline.
Furthermore, the utilization rate adjusting device is partially or completely designed into a variable blind structure.
Furthermore, the high-temperature alumina roasting furnace also comprises a second roasting furnace, the second roasting furnace is connected with the first roasting furnace, and a burner is arranged at the lower end of the second roasting furnace.
Furthermore, the heat user is a gas heater of the roasting furnace.
Compared with the prior art, the utility model has the beneficial effects that:
1. the utility model can utilize the waste heat of the outer shell of the roasting furnace, heat residents nearby a plant area, or heat the fuel gas of the roasting furnace to improve the combustion efficiency of the roasting furnace, and can also be used for providing domestic hot water of the plant area.
2. The utility model transfers the heat of the roasting furnace shell to a heat user through the shell heat conduction device, and the outer part of the shell is provided with the adjustable heat insulation structure, so that the temperature of the final outer surface of the roasting furnace is greatly reduced, the working environment near the equipment is greatly improved, a high-temperature hazard source is eliminated, and the health of operators near the roasting furnace is ensured.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate an embodiment of the utility model and, together with the description, serve to explain the utility model and not to limit the utility model. In the drawings:
FIG. 1 is a schematic view of a waste heat recovery device of a high-temperature alumina roasting furnace according to the present invention;
FIG. 2 is a schematic view of a shell heat transfer device of the sandwich tank and water coil configuration of the present invention;
FIG. 3 is a schematic view of an open state of the variable blind structure;
FIG. 4 is a schematic view of a closed state of the variable blind structure;
FIG. 5 is a schematic view of a circulation line system.
1-shell heat conduction device, 2-utilization rate adjusting device, 3-circulation pipeline system, 4-heat user, 5-water cooling coil pipe, 6-upper header, 7-lower header, 8-first exhaust valve, 9-interlayer water tank, 10-second exhaust valve, 11-temperature measuring device, 13-variable shutter structure, 14-user water supply pipeline, 15-user water return pipeline, 16-adjusting valve, 17-third safety valve, 18-third exhaust valve, 19-pressurizing circulating pump, 20-first roasting furnace, 21-second roasting furnace and 22-combustor.
Detailed Description
The technical solution in the embodiments of the present invention will be clearly and completely explained below with reference to the drawings in the embodiments of the present invention. It should be noted that, in the present invention, the embodiments and features of the embodiments may be combined with each other without conflict, and the described embodiments are only a part of the embodiments of the present invention, not all of the embodiments.
Referring to fig. 1-5, in the present embodiment, the shell heat conduction device 1 is disposed outside the lower conical cylinder of the first roasting furnace 20, two ends of the circulation pipeline system 3 are respectively and fixedly connected to and communicated with the shell heat conduction device 1 and the heat consumer 4, an insulating layer is disposed outside the shell heat conduction device 1, the first roasting furnace 20 can no longer radiate heat outwards in an air convection manner, the shell heat conduction device 1 conducts heat of the shell of the first roasting furnace 20, the circulation pipeline system 3 provides heat to the heat consumer 4, and waste heat of the outer shell of the roasting furnace can be utilized, so as to heat residents near the factory.
Furthermore, the shell heat conduction device 1 of the utility model adopts a structure of an interlayer water tank 9 and a water-cooling coil pipe 5, the water-cooling coil pipe 5 is positioned in the interlayer water tank 9, the water-cooling coil pipe 5 is communicated with a circulating pipeline system 3, the outer side of the shell of the first roasting furnace 20 is welded with a shell interlayer with the thickness of 200mm by a 304 steel plate with the thickness of 3mm, water is filled in the interlayer to be used as a reinforced heat transfer medium, the interlayer is designed at normal pressure, a temperature measuring device 11 is arranged in the interlayer and is set to be in remote transmission, the vertical water-cooling coil pipe 5 is adopted in the interlayer, the water in the interlayer exchanges heat in a natural convection mode with the shell of the first roasting furnace 20, then, the heat is transferred to the vertical water-cooling coil pipes 5, the heated medium in the water-cooling coil pipes 5 is collected through the upper header 6, and is conveyed to the heat consumer 4 through the circulating pipeline system 3, so that the waste heat of the shell of the first roasting furnace 20 is utilized.
Furthermore, the shell heat conduction device 1 of the utility model adopts a structure of heat conduction reinforced contact surface and the water cooling coil 5, the diameter of the pipeline of the water cooling coil 5 can be different from phi 20 to phi 80 according to the actual heat exchange condition, the heat conduction reinforced contact surface is arranged between the water cooling coil 5 and the shell of the first roasting furnace 20, and heat conduction silicone grease is filled between the contact surfaces, so that the heat conduction between the shell of the first roasting furnace 20 and the water cooling coil 5 can be reinforced, and the temperature difference can be reduced.
Furthermore, the shell heat conduction device 1 of the utility model is of an integral membrane water cooling structure, the shell structure of the first roasting furnace 20 adopting the structure is a membrane water cooling wall, the refractory heat-preservation bricks in the first roasting furnace 20 are designed according to the surface structure of the water cooling wall, and the upper end and the lower end of the membrane water cooling wall are connected with an upper header 6 and a lower header 7.
Furthermore, in the three structures, the temperature measuring devices 11 are arranged on the inner wall surface of the shell heat conduction device 1, and the temperature of the inner wall surface of the shell is kept unchanged after the final device is used by adjusting means such as water circulation quantity, heat preservation area and the like.
Furthermore, a utilization rate adjusting device 2 is arranged on the outer side of the shell heat conduction device 1, the available heat quantity can be adjusted through the utilization rate adjusting device 2, the utilization rate adjusting device 2 can be used for heat preservation of the shell heat conduction device 1 and can also adjust the available heat quantity proportion in heat conduction, a light heat preservation and insulation material with the thickness of 50mm-200mm is laid on the outer side of the shell heat conduction device 1, a heat preservation iron sheet enclosure structure is arranged on the outermost side, the working temperature of the shell heat conduction device 1 can be maintained at different temperature levels according to different thicknesses of the heat preservation layers, the temperature can be changed between the outdoor environment temperature and the shell wall surface temperature, when the heat quantity used by a heat user 4 is low, in order to ensure that the shell heat conduction device 1 does not exceed the temperature, in the outer wall heat preservation structure, part or all position structures can be designed into a variable shutter structure 13 made of hard heat preservation materials, when the heat radiator is started, the original heat radiation way of air convection heat radiation can be reused, and the utilization rate of waste heat is adjusted.
Further, the heat consumer 4 is a gas heater of the roasting furnace, and the heat consumer includes a user water supply pipeline 14, a user water return pipeline 15, a regulating valve 16, a third safety valve 17, a third exhaust valve 18 and a pressurizing circulation pump 19, and since the heat consumer 4 is the gas heater of the roasting furnace, cold water coming out of the heat consumer 4 passes through the user water return pipeline 15, is pressurized by the pressurizing circulation pump 19, and is conveyed to the lower collection tank 7 to be dispersed to the water cooling coil pipe 5 for heating again.
Further, in the use process of the whole equipment, the temperature of the heat source end is regulated through a variable shutter structure 13 arranged in a heat preservation layer in the utilization rate regulating device 2, a regulating valve 16 in a circulating pipeline system and a pressurizing circulating pump 19, so that the temperature in the interlayer water tank 9 is maintained below 95 ℃, and local boiling is avoided.
The embodiments of the utility model disclosed above are intended merely to aid in the explanation of the utility model. The examples are not intended to be exhaustive or to limit the utility model to the precise forms disclosed. Many modifications and variations are possible in light of the above teaching. The embodiments were chosen and described in order to best explain the principles of the utility model and the practical application, to thereby enable others skilled in the art to best utilize the utility model.
Claims (10)
1. The utility model provides a waste heat recovery device of high temperature alumina roasting furnace which characterized in that: the high-temperature aluminum oxide roasting furnace comprises a shell heat conduction device (1), a circulation pipeline system (3) and a heat user (4), wherein the high-temperature aluminum oxide roasting furnace comprises a first roasting furnace (20), the shell heat conduction device (1) is arranged on the outer side of the lower conical cylinder position of the first roasting furnace (20), and two ends of the circulation pipeline system (3) are respectively communicated with the shell heat conduction device (1) and the heat user (4).
2. The waste heat recovery device of the high-temperature alumina roasting furnace according to claim 1, characterized in that: the shell heat conduction device (1) is of an interlayer water tank (9) and water-cooling coil pipe (5) structure, the water-cooling coil pipe (5) is located in the interlayer water tank (9), an upper header (6) and a lower header (7) are arranged at two ends of the water-cooling coil pipe (5) respectively, the interlayer water tank (9) is fixedly connected to the outer side of a shell of a first roasting furnace (20), a second safety valve and a second exhaust valve (10) are arranged on an interlayer wall of the interlayer water tank (9), and the upper header (6) and the lower header (7) are communicated with two ends of a circulating pipeline system (3) respectively.
3. The waste heat recovery device of the high-temperature alumina roasting furnace according to claim 1, characterized in that: the shell heat conduction device (1) is of a heat conduction reinforced contact surface and water cooling coil (5) structure, the outer wall of the shell of the first roasting furnace (20) is annularly provided with a surrounding or vertical water cooling coil (5), the heat conduction reinforced contact surface is arranged between the water cooling coil (5) and the shell of the first roasting furnace (20), the heat conduction reinforced contact surface is compressed by bolts, heat conduction silicone grease is filled in the middle of the heat conduction reinforced contact surface, two ends of the water cooling coil (5) are respectively communicated with an upper header (6) and a lower header (7), and the upper header (6) and the lower header (7) are respectively communicated with two ends of a circulation pipeline system (3).
4. The waste heat recovery device of the high-temperature alumina roasting furnace according to claim 1, characterized in that: the shell heat conduction device (1) is of an integral membrane type water cooling structure, the shell structure of the first roasting furnace (20) is a membrane type water cooling wall, an upper header (6) and a lower header (7) are arranged on the membrane type water cooling wall, and the upper header (6) and the lower header (7) are respectively communicated with two ends of the circulation pipeline system (3).
5. A high temperature alumina roasting furnace waste heat recovery device according to claim 2, 3 or 4, characterized in that: the shell heat conduction device (1) is characterized in that a temperature measuring device (11) is arranged on the inner wall surface of the shell, and a first safety valve and a first exhaust valve (8) are arranged on the upper header (6).
6. The waste heat recovery device of the high-temperature alumina roasting furnace according to claim 1, characterized in that: and a utilization rate adjusting device (2) is arranged on the outer side of the shell heat conduction device (1).
7. The waste heat recovery device of the high-temperature alumina roasting furnace according to claim 2, characterized in that: the circulation pipeline system (3) comprises a user water supply pipeline (14), a user water return pipeline (15), a regulating valve (16), a third safety valve (17), a third exhaust valve (18) and a pressurizing circulation pump (19), one ends of the user water supply pipeline (14) and the user water return pipeline (15) are communicated with a hot user (4), the other end of the user water supply pipeline (14) is communicated with an upper header (6), the other end of the user water return pipeline (15) is communicated with a lower header (7), the regulating valves (16) are arranged on the user water supply pipeline (14) and the user water return pipeline (15), the third safety valve (17) and the third exhaust valve (18) are further arranged on the user water supply pipeline (14), and the pressurizing circulation pump (19) is further arranged on the user water return pipeline (15).
8. The waste heat recovery device of the high-temperature alumina roasting furnace of claim 6, wherein: the utilization rate adjusting device (2) is partially or wholly designed into a variable shutter structure (13).
9. The waste heat recovery device of the high-temperature alumina roasting furnace according to claim 1, characterized in that: the high-temperature aluminum oxide roasting furnace further comprises a second roasting furnace (21), the second roasting furnace (21) is connected with the first roasting furnace (20), and a burner (22) is arranged at the lower end of the second roasting furnace (21).
10. The waste heat recovery device of the high-temperature alumina roasting furnace according to claim 1, characterized in that: the heat user (4) is a gas heater of the roasting furnace.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202123423230.3U CN216668340U (en) | 2021-12-31 | 2021-12-31 | Waste heat recovery device of high-temperature alumina roasting furnace |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202123423230.3U CN216668340U (en) | 2021-12-31 | 2021-12-31 | Waste heat recovery device of high-temperature alumina roasting furnace |
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| Publication Number | Publication Date |
|---|---|
| CN216668340U true CN216668340U (en) | 2022-06-03 |
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| CN202123423230.3U Active CN216668340U (en) | 2021-12-31 | 2021-12-31 | Waste heat recovery device of high-temperature alumina roasting furnace |
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| CN (1) | CN216668340U (en) |
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2021
- 2021-12-31 CN CN202123423230.3U patent/CN216668340U/en active Active
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