阅读说明：本技术 一种处理氢氧化铝焙烧炉烟气余热回收装置 (Flue gas waste heat recovery device for aluminum hydroxide roasting furnace ) 是由 胡克荣 尹德明 于 2020-03-24 设计创作，主要内容包括：本发明涉及一种烟气余热回收装置,尤其涉及一种处理氢氧化铝焙烧炉烟气余热回收装置。一种处理氢氧化铝焙烧炉烟气余热回收装置,焙烧炉的出口与电收尘器的进口连接,电收尘器的出口通过风机与换热设备的烟气进口连接,换热设备的烟气出口与烟囱连接；其中换热设备包括壳体,在壳体内设有换热管道,换热管道的外壁上设有翅片,换热管道的循环水进口和循环水出口设在壳体上,烟气进口和烟气出口设在壳体上。本发明的优点效果：高温烟气在换热设备内进行热交换,烟气进口设置于壳体的下部,烟气出口设置于壳体的上部,这样可以保证烟气排出具有良好的流通性；翅片设置于换热管道上,能增加换热效果,支架固定在壳体上,起支撑换热管道的作用。(The invention relates to a flue gas waste heat recovery device, in particular to a flue gas waste heat recovery device for an aluminum hydroxide roasting furnace. A flue gas waste heat recovery device for an aluminum hydroxide roasting furnace is characterized in that an outlet of the roasting furnace is connected with an inlet of an electric dust collector, an outlet of the electric dust collector is connected with a flue gas inlet of heat exchange equipment through a fan, and a flue gas outlet of the heat exchange equipment is connected with a chimney; the heat exchange equipment comprises a shell, a heat exchange pipeline is arranged in the shell, fins are arranged on the outer wall of the heat exchange pipeline, a circulating water inlet and a circulating water outlet of the heat exchange pipeline are arranged on the shell, and a flue gas inlet and a flue gas outlet are arranged on the shell. The invention has the advantages and effects that: the high-temperature flue gas is subjected to heat exchange in the heat exchange equipment, the flue gas inlet is arranged at the lower part of the shell, and the flue gas outlet is arranged at the upper part of the shell, so that the flue gas can be ensured to be discharged with good circulation; the fin sets up on heat transfer pipeline, can increase the heat transfer effect, and the support is fixed on the casing, plays the effect of supporting heat transfer pipeline.)

1. A device for treating the waste heat of flue gas of an aluminum hydroxide roasting furnace is characterized in that the device is used for roasting the furnace

The outlet of the electric dust collector is connected with the inlet of the heat exchange device through a fan, and the flue gas outlet of the heat exchange device is connected with a chimney; the heat exchange equipment comprises a shell, a heat exchange pipeline is arranged in the shell, fins are arranged on the outer wall of the heat exchange pipeline, a circulating water inlet and a circulating water outlet of the heat exchange pipeline are arranged on the shell, and a flue gas inlet and a flue gas outlet are arranged on the shell.

2. The apparatus of claim 1, wherein the circulating water outlet is disposed at the lower portion of the side wall of the casing, and the circulating water inlet is disposed at the upper portion of the side wall of the casing.

3. The apparatus of claim 2, wherein the circulating water outlet and the circulating water inlet are disposed on the same side.

4. The apparatus of claim 1, wherein the circulating water outlet, the circulating water inlet and the flue gas inlet are disposed on the same side.

5. The apparatus of claim 1 wherein the heat exchange conduit is serpentine in shape within the housing.

6. The apparatus for recovering the residual heat from the flue gas of an aluminum hydroxide roasting furnace according to claim 5, wherein a support is disposed at the bottom of the inner upper tube at the bend of the serpentine heat exchange tube, the support is disposed in the casing, and the end of the support is fixed to the inner wall of the casing.

7. The apparatus of claim 1 wherein the fins are disposed on the outer wall of the heat exchange tube in a spiral, tube or flake shape.

8. The apparatus of claim 1, wherein the flue gas inlet is disposed at a lower portion of a side wall of the casing, and the flue gas outlet is disposed at an upper portion of another side wall of the casing.

9. The apparatus for recovering the residual heat from the flue gas of the aluminum hydroxide roasting furnace according to claim 1, 5 or 6, wherein the number of the heat exchange pipes is at least two.

Technical Field

The invention relates to a flue gas waste heat recovery device, in particular to a flue gas waste heat recovery device for an aluminum hydroxide roasting furnace.

Background

In industrial production, particularly in the production of alumina, an aluminum hydroxide roasting furnace is an important large-scale equipment. The roasting furnace comprises a Venturi dryer (AO 2), a primary cyclone preheater (PO 1), a secondary cyclone preheater (PO 2), a tertiary cyclone preheater (PO 3), a quaternary cyclone preheater (PO 4), a primary cyclone cooler (CO 1), a secondary cyclone cooler (CO 2), a tertiary cyclone cooler (CO 3) and a quaternary cyclone cooler (CO 4). The alumina obtained after the aluminum hydroxide is roasted and cooled by the roasting furnace is discharged from a four-stage cyclone cooler (CO 4), and the flue gas generated in the roasting process is discharged from a primary cyclone preheater (PO 1). The flue gas then enters an electric dust collector, is discharged into a chimney by a fan after dust collection and then is discharged into the atmosphere. The temperature of flue gas discharged into the atmosphere in the existing alumina production can reach 140-170 ℃, and the operation stability and the service life of a dust collector can be influenced when the temperature is too high, and the waste heat is more when the temperature is higher.

Disclosure of Invention

The invention provides a device for treating the flue gas waste heat of an aluminum hydroxide roasting furnace, aiming at solving the technical problems of reasonable structure, low investment cost, energy conservation and consumption reduction.

In order to achieve the above object, the present invention is realized by: treating aluminum hydroxide roasting furnace smoke

The outlet of the roasting furnace is connected with the inlet of an electric dust collector, the outlet of the electric dust collector is connected with the flue gas inlet of the heat exchange equipment through a fan, and the flue gas outlet of the heat exchange equipment is connected with a chimney; the heat exchange equipment comprises a shell, a heat exchange pipeline is arranged in the shell, fins are arranged on the outer wall of the heat exchange pipeline, a circulating water inlet and a circulating water outlet of the heat exchange pipeline are arranged on the shell, and a flue gas inlet and a flue gas outlet are arranged on the shell.

The circulating water outlet is arranged at the lower part of the side wall of the shell, and the circulating water inlet is arranged at the upper part of the side wall of the shell.

The circulating water outlet and the circulating water inlet are arranged on the same side.

The circulating water outlet, the circulating water inlet and the flue gas inlet are arranged on the same side.

The heat exchange pipeline is in a snake shape in the shell.

The bottom of the inner side upper pipe at the bend of the snake-shaped heat exchange pipeline is provided with a support which is arranged in the shell, and the end part of the support is fixed on the inner wall of the shell.

The shell is internally provided with a bracket, and the end part of the bracket is fixed on the inner wall of the shell.

The fins are spirally arranged on the outer wall of the heat exchange pipeline in a tube sheet or fish scale manner.

The flue gas inlet is arranged at the lower part of the side wall of the shell, and the flue gas outlet is arranged at the upper part of the other side wall of the shell.

The number of the heat exchange pipelines is at least two.

The invention has the advantages and effects that: the high-temperature flue gas is subjected to heat exchange in the heat exchange equipment, the flue gas inlet is arranged at the lower part of the shell, and the flue gas outlet is arranged at the upper part of the shell, so that the flue gas can be ensured to be discharged with good circulation; the fin sets up on heat transfer pipeline, can increase the heat transfer effect, and the support is fixed on the casing, plays the effect of supporting heat transfer pipeline. The water temperature of heat exchange can be 4-5 ℃ higher than that before heat exchange, and the cooling water after temperature rise can be used as sedimentation washing water or flat disc filtration washing water, so that the heat energy in the production of the alumina can be saved.

Drawings

Fig. 1 is a schematic diagram of the connection of the present invention.

FIG. 2 is a schematic diagram of the structure of the heat exchange device.

In the figure: 1. roasting furnace; 2. an electric dust collector; 3. a fan; 4. heat exchange equipment; 5. a chimney; 6.

a circulating water outlet; 7. a flue gas inlet; 8. a circulating water inlet; 9. a housing; 10. a heat exchange conduit; 11. a fin; 12. a flue gas outlet; 13. and (4) a bracket.

Detailed Description

The following detailed description of the embodiments of the present invention is provided in conjunction with the accompanying drawings, but the scope of the present invention is not limited by the embodiments.

A flue gas waste heat recovery device for an aluminum hydroxide roasting furnace is characterized in that an outlet of a roasting furnace 1 is connected with an inlet of an electric dust collector 2, an outlet of the electric dust collector 2 is connected with a flue gas inlet 7 of a heat exchange device 4 through a fan 3, and a flue gas outlet 12 of the heat exchange device 4 is connected with a chimney 5; wherein heat exchange device 4 includes casing 9, is equipped with heat transfer pipeline 10 in casing 9, is equipped with fin 11 on heat transfer pipeline 10's the outer wall, and the circulating water import 8 and the circulating water export 6 of heat transfer pipeline 11 are established on casing 9, and flue gas import 7 and exhanst gas outlet 12 are established on casing 9.

The circulating water outlet 6 is arranged at the lower part of the side wall of the shell 9, and the circulating water inlet 8 is arranged at the upper part of the side wall of the shell 9.

The circulating water outlet 6 and the circulating water inlet 8 are arranged on the same side.

And the circulating water outlet 6, the circulating water inlet 8 and the flue gas inlet 7 are arranged on the same side.

The shape of the heat exchange pipeline 10 in the shell is snake-shaped, a support 13 is arranged at the bottom of an inner side upper pipe at the bend of the snake-shaped heat exchange pipeline, the support 13 is arranged in the shell, and the end part of the support 13 is fixed on the inner wall of the shell 1.

The fins 11 are spirally arranged on the outer wall of the heat exchange pipeline 10 in a tube sheet or fish scale shape.

The flue gas inlet 7 is arranged at the lower part of the side wall of the shell, and the flue gas outlet 12 is arranged at the upper part of the other side wall of the shell 9.

The number of the heat exchange pipes 10 is at least two.

The working principle of the invention is as follows: the material aluminum hydroxide enters from an aluminum hydroxide inlet, enters the roasting furnace 1 for roasting and cooling, the aluminum oxide is discharged from CO4 of the roasting furnace, the flue gas is discharged from a PO1 outlet of the roasting furnace 1, then enters the electric dust collector 2 for dust collection, and the flue gas is sent to the heat exchange device 4 through the fan 3. Cooling water flows into the heat exchange pipeline 10 from a circulating water inlet 8 of the heat exchange device 4, and flue gas entering the heat exchange device 4 exchanges heat with the heat exchange pipeline 10 and the fins. And finally, the flue gas after heat exchange is discharged from a flue gas outlet 12, enters a chimney 5 and is finally discharged into the atmosphere. The cooling water after heat exchange is discharged from a circulating water outlet 6, the water temperature of the cooling water can be 4-5 ℃ higher than that before heat exchange, and the cooling water after temperature rise can be used as sedimentation washing water or flat disc filtration washing water, so that the heat energy in the production of the aluminum oxide can be saved.