CN212058351U - Aluminum hydroxide roasting furnace flue gas phase change dust removal waste heat recovery device - Google Patents
Aluminum hydroxide roasting furnace flue gas phase change dust removal waste heat recovery device Download PDFInfo
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- CN212058351U CN212058351U CN202020743920.3U CN202020743920U CN212058351U CN 212058351 U CN212058351 U CN 212058351U CN 202020743920 U CN202020743920 U CN 202020743920U CN 212058351 U CN212058351 U CN 212058351U
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Abstract
The utility model belongs to the technical field of energy-concerving and environment-protective, have and relate to an aluminium hydroxide bakes burning furnace flue gas phase transition dust removal waste heat recovery device over a slow fire, cool down the heat transfer to the roasting furnace flue gas through setting up phase transition dust removal heat exchanger, behind cold medium and the flue gas waste heat transfer in the heat exchanger, can separate out the dust-laden little liquid drop when cooling down the flue gas, along with the continuous grow of liquid drop size, begin to drip and discharge by first drain outlet, on the other hand, flue gas after the heat transfer cooling continues to let in the cyclone, through the solid particle in the further separation flue gas after the washing, and then realize the recovery to solid particle, adopt earlier heat transfer phase transition dust removal, the mode of back washing dust removal can be when saving the water resource, to the comprehensive recycle of dust particle in the flue gas, the dust removal rate to the flue gas has been, Saving energy.
Description
Technical Field
The utility model belongs to the technical field of energy-concerving and environment-protective, have and relate to an aluminium hydroxide bakes burning furnace flue gas phase transition dust removal waste heat recovery device over a slow fire.
Background
In the industrial production of aluminum oxide, a gaseous suspension roasting furnace is mainly used for roasting aluminum hydroxide, and the roasted flue gas is usually treated by an electrostatic dust collector. The temperature of the roasting flue gas entering the electrostatic dust collector is about 160 ℃, the temperature is about 130 ℃ and 150 ℃ after dust removal, the volume ratio of water vapor is about 40%, and the roasting flue gas is discharged into the atmosphere. On the one hand, the dust remover is comparatively general smoke and dust recovery unit, the aluminium hydroxide of dust remover entrapment is sent first order cyclone to the cooler entering calcination circulation flow through returning ash conveying system, it mainly includes the pnematic chute of transported substance material to return ash conveying system, a high pressure centrifugal fan for providing wind-force, a pneumatic lift pump and roots's fan for promoting gas-solid mixture pressure etc., this processing flow though can retrieve the aluminium hydroxide in the flue gas, but the flue gas temperature after handling is higher, the waste heat is not utilized, cause the energy extravagant, and it adopts the pneumatic lift pump to return the ash system, roots's fan, centrifugal fan etc., the energy consumption is high, and cause easily that to get into first order cyclone cooler air current unstable. On the other hand, China is strongly advocating the establishment of an energy-saving society, and the development of enterprises is required to further save energy and reduce cost, and the energy saving not only comprises the recycling of heat energy and dust, but also comprises the realization of the maximum recycling of the heat energy and the dust by adopting the minimum energy consumption, namely the reduction of the energy consumption required by a recycling device.
In the prior art, patent document with the publication number of CN203672160U provides a dust recovery device in flue gas of an aluminum hydroxide roasting furnace, which comprises a flue gas waste heat recovery heat exchanger, the bottom of the flue gas waste heat recovery heat exchanger is a cone bottom, an underflow pipeline at the bottom of the cone bottom is connected with a filter press through an underflow pump, a flue gas pipeline connected with an electric dust collection device is arranged above the cone bottom, and cold water in a cold water pipe sprays the flue gas in the flue gas waste heat recovery heat exchanger.
The patent document with the application publication number of CN106492545A provides a device and a method for recovering aluminum hydroxide and residual energy in aluminum hydroxide roasting flue gas, which comprises a flue gas-water heat exchanger and a flue gas-air heat exchanger, wherein the technical scheme can sufficiently recover preheating, but the aluminum hydroxide roasting flue gas contains not only solid dust but also water vapor, and in the step of the flue gas-water heat exchanger, the water vapor and the dust are condensed together, but the dust is difficult to be sufficiently recovered and utilized in the flue gas-water heat exchanger.
Along with the continuous high-speed development of Chinese economy, the restriction of energy shortage is more and more serious, and the research and development of a perfect flue gas dedusting waste heat recovery device is very needed.
SUMMERY OF THE UTILITY MODEL
The utility model provides a phase change dedusting waste heat recovery device for flue gas of an aluminum hydroxide roasting furnace, which solves the problems of low dedusting rate and large energy consumption of the flue gas in the prior art.
The utility model discloses an aluminium hydroxide roasting furnace flue gas phase transition dust removal waste heat recovery device adopts following technical scheme:
the utility model provides an aluminium hydroxide roasting furnace flue gas phase transition dust removal waste heat recovery device, includes phase transition dust removal heat exchanger, phase transition dust removal heat exchanger has the first drain hole that is used for discharging the sewage after the cooling, phase transition dust removal heat exchanger's air inlet and the corresponding flue gas discharge port of roasting the stove are connected its characterized in that of roasting: and the gas outlet of the phase-change dust removal heat exchanger is connected with a cyclone scrubber, so that secondary dust removal and heat exchange of the flue gas passing through the phase-change dust removal heat exchanger are realized.
Preferably, a first spraying device for accelerating phase change to separate out dust-containing small liquid drops is arranged in the phase change dust removal heat exchanger.
Preferably, porous plates for enabling flue gas to enter and exit uniformly and stably are arranged at positions, close to the air inlet and the exhaust port, in the phase-change dust removal heat exchanger.
Preferably, a second spraying device for washing the flue gas is arranged in the cyclone scrubber, and a packing layer for prolonging the flue gas washing retention time and the contact area is arranged below the second spraying device in the cyclone scrubber.
Preferably, the filler of the filler layer is a polyhedral hollow sphere.
Preferably, the flue gas phase change dust removal waste heat recovery device for the aluminum hydroxide roasting furnace further comprises a sedimentation tank communicated with the first discharge port, a slurry discharge port for discharging sediments is formed in the bottom of the sedimentation tank, and the slurry discharge port is connected to a filter for filtering and washing slurry through a pipeline so as to realize reutilization.
Preferably, a slurry valve for adjusting the flow rate is arranged on a pipeline between the slurry discharge port and the flat disc filter.
Preferably, a clear water outlet for discharging settled clear water is arranged on the side surface of the settling pond, and the clear water outlet is connected with a clear water tank for storing water through a pipeline.
Preferably, a water outlet of a heat exchange medium of the phase-change dust removal heat exchanger is connected with the clean water tank.
Preferably, the bottom of the cyclone scrubber is provided with a second sewage discharge outlet used for discharging sewage and communicated with the sedimentation tank, and the clean water tank is communicated with the second spraying device through a pipeline, so that the water resource is recycled.
The utility model has the advantages that:
(1) the utility model provides a flue gas phase transition dust removal waste heat recovery device is baked over a slow fire to aluminium hydroxide, cool off the heat transfer to burning over a slow fire through setting up phase transition dust removal heat exchanger, behind cold medium and the flue gas waste heat transfer in the heat exchanger, can separate out the dusty droplet in the time of the flue gas cooling, along with the continuous grow of droplet size, begin to drip and discharge by first drain hole, on the other hand, flue gas after the heat transfer cooling continues to let in cyclone, further separate the solid particle in the flue gas through washing back, and then realize the recovery to solid particle, adopt earlier heat transfer phase transition dust removal, the mode that the back washing was removed dust can be when saving the water resource, comprehensive recycle the dust particle in the flue gas, the dust removal rate to the flue gas has been improved.
(2) The phase change dust removal heat exchanger can recover waste heat in flue gas, and hot water obtained after cold water in the spiral heat exchange tube exchanges heat with the waste heat of the flue gas is collected in the clear water tank and is sent into the cyclone washer through the spray pump to be used as washing water.
(3) The porous fixing plate is arranged in the phase-change dust removal heat exchanger, so that the flue gas can uniformly enter and exit, and the flue gas can promote submicron particles to effectively agglomerate and grow after phase-change condensation, thereby being beneficial to further dust removal, improving the dust removal efficiency and achieving fine dust removal.
(4) Compared with the traditional ash returning conveying system, the washed aluminum hydroxide slurry is conveyed to the flat disc filter through the slurry pump to be filtered and washed, and then is conveyed to the roasting process, so that the energy consumption can be reduced, the process equipment can be reduced, the problem of unstable ash returning airflow can be solved, and the aluminum hydroxide slurry with the waste heat recovery has a certain temperature and is favorable for filtering.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without inventive exercise.
FIG. 1 is a schematic structural diagram of a specific embodiment of a flue gas phase change dust removal waste heat recovery device of an aluminum hydroxide roasting furnace of the present invention;
reference numerals:
1: a phase-change dust removal heat exchanger; 2: a first spraying device; 3: a perforated plate; 4: a cooling water inlet; 5: a spiral heat exchange tube; 6: a cooling water outlet; 7: a sedimentation tank; 8: a clear water tank; 9: a slurry pump; 10: a flat disc filter; 11: a spray pump; 12: an adjusting plate; 13: a cyclone scrubber; 14: a grid plate; 15: a filler layer; 16: a second spraying device; 17: a demister; 18: an outlet flue; 19: a first drain port; 20: a second sewage draining outlet; 21: a buffer tank.
Detailed Description
In order to make the above objects, features and advantages of the present invention more comprehensible, embodiments of the present invention are described in detail below with reference to the accompanying drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. The invention can be embodied in many other forms than those specifically described herein and similar modifications can be made by one skilled in the art without departing from the spirit and scope of the invention and, therefore, the invention is not limited to the embodiments of the substrate disclosed below.
It will be understood that when an element is referred to as being "secured to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "left," "right," and similar expressions are used herein for illustrative purposes only and do not represent the only embodiments.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
The utility model discloses an embodiment of a phase transition dust removal waste heat recovery device of aluminium hydroxide roasting furnace flue gas. As shown in fig. 1, a phase change dust removal waste heat recovery device for flue gas of an aluminum hydroxide roasting furnace comprises a phase change dust removal heat exchanger 1, wherein the phase change dust removal heat exchanger 1 is provided with a first exhaust port 19 for discharging cooled sewage, an air inlet of the phase change dust removal heat exchanger 1 is connected with a flue gas outlet of a corresponding roasting furnace, an air outlet of the phase change dust removal heat exchanger 1 is connected with a cyclone scrubber 13, and further secondary dust removal is performed on the flue gas passing through the phase change dust removal heat exchanger 1. Through setting up phase change dust removal heat exchanger 1 and carrying out the cooling heat transfer to roasting furnace, behind the cold medium in the heat exchanger and the waste heat transfer of flue gas, can separate out the dust-laden little drop in the time of with the flue gas cooling, along with the continuous grow of drop size, begin to drip and discharge by first drain port 19, on the other hand, flue gas after the heat transfer cooling continues to let in cyclone 13, further separate the solid particle in the flue gas through the washing, and then realize the recovery to solid particle, adopt earlier heat transfer phase change dust removal, the mode of back washing dust removal can be when saving the water resource, comprehensive recycle of dust particle in the flue gas, the dust removal rate to the flue gas has been improved.
In order to further improve the precipitation of dust-containing small liquid drops in the phase-change dust-removal heat exchanger 1, a first spraying device 2 for accelerating the phase-change precipitation of the dust-containing small liquid drops is arranged in the phase-change dust-removal heat exchanger 1, specifically, the first spraying device 2 comprises a spraying pipeline and atomizing nozzles arranged on the spraying pipeline, and the spraying pipeline and the atomizing nozzles are distributed on the central axis and the inner wall of the phase-change dust-removal heat exchanger 1.
It should be noted that in this embodiment, the phase change dust removal heat exchanger 1 employs the spiral heat exchange tube 5 to prolong the contact time and the heating area of the heat exchange medium (i.e., cooling water); in the embodiment, high-temperature flue gas enters from the right side and is discharged from the left side of the phase change dust removal heat exchanger 1, a cold water medium flows in from a cooling water inlet 4 on the upper left side of the phase change dust removal heat exchanger 1 and is discharged from a cooling water outlet 6 on the lower right side of the phase change dust removal heat exchanger 1, and specifically, the flowing direction of the cooling water in the phase change dust removal heat exchanger 1 is opposite to that of the high-temperature flue gas; in the embodiment, the bottom of the phase change dust removal heat exchanger 1 is conical, so that a throat structure is formed at the position of the first sewage discharge port 19, and sewage is conveniently discharged; the spiral heat exchange tube 5 is introduced with cold water from the upper part to exchange heat with high-temperature flue gas, so that the vapor in the high-temperature flue gas is subjected to phase change condensation, the vapor in the flue gas is condensed by taking particulate matters and tube banks as condensation nuclei, the particle size of the particulate matters is promoted to grow rapidly, meanwhile, a liquid film is formed on the tube wall, and the collected particulate matters are carried by a flowing liquid film on the tube wall to flow into a sedimentation tank 7 along with large liquid drops.
In order to ensure that the flue gas can uniformly enter and exit the phase-change dust-removal heat exchanger 1, porous plates 3 used for enabling the flue gas to stably enter and exit are arranged at positions, close to the air inlet and the exhaust outlet, in the phase-change dust-removal heat exchanger 1, and the spiral heat exchange tubes 5 and the spray pipes are fixed on the porous plates 3.
A second spraying device 16 used for washing the flue gas is arranged in the cyclone washer 13, a nozzle on the second spraying device 16 is a mechanical nozzle, a packing layer 15 used for prolonging the flue gas washing retention time and the contact area is arranged below the second spraying device 16 in the cyclone washer 13, and the bottom of the packing layer 15 is fixed by a porous grid plate 14 for uniformly entering the flue gas, specifically, the packing of the packing layer 15 is a polyhedral hollow sphere; a demister 17 is further arranged above the second spraying device 16 in the cyclone scrubber 13, mist drops in the gas after spraying and washing are removed through the demister 17, and finally the gas enters a chimney through an outlet flue 18 and is discharged into the atmosphere.
In this embodiment, the inlet flue of the filler spray cyclone scrubber 13 is provided with an adjusting plate 12, so that the flue gas enters the cyclone scrubber 13 tangentially, and the liquid drops carrying dust particles are thrown to the wall of the cyclone scrubber 13 and then sink to the bottom of the cyclone scrubber along the wall.
Bear the aluminium hydroxide bakes burning furnace flue gas phase transition dust removal waste heat recovery device still includes the sedimentation tank 7 with 19 intercommunications of first drain hole, the bottom of sedimentation tank 7 is equipped with and is used for arranging the thick liquid mouth with the precipitate exhaust, the bottom of sedimentation tank 7 is the toper bottom, be convenient for arrange the thick liquid mouth and discharge the precipitate (promptly ground paste), it is used for filtering the washing and then realize the filter of reuse with the ground paste through pipe connection to arrange the thick liquid mouth, the filter in this embodiment is flat-disc filter 10, specifically, ground paste after the sediment is sent to flat-disc filter 10 through material thick liquid pump 9. A slurry valve for adjusting the flow is arranged on a pipeline between the slurry discharge port and the flat disc filter 10, and specifically, the slurry valve is a Y-shaped slurry valve.
In this embodiment, a clear water outlet for discharging the clear water after precipitation is formed in the side surface of the sedimentation tank 7, and the clear water outlet is connected with a clear water tank 8 for storing water through a pipeline.
The water outlet of the heat exchange medium of the phase change dust removal heat exchanger 1 is connected with the clean water tank 8, and specifically, hot water obtained through heat exchange in the spiral heat exchange tube 5 is discharged into the clean water tank 8 for temperature rise.
The bottom of cyclone scrubber 13 is equipped with and is used for discharging sewage and with the second drain 20 of sedimentation tank 7 intercommunication, clear water tank 8 through the pipeline with second spray set 16 intercommunication, in this embodiment, be provided with spray pump 11 on the water route between clear water tank 8 and the second spray set 16, and then realize the recycling of water resource, its advantage lies in preventing that the scrubber from freezing in winter, saves the antifreeze measure to but this hot water cyclic utilization, energy-concerving and environment-protective.
In this embodiment, a buffer tank 21 is provided between the slurry pump 9 and the flat disc filter 10.
It should be noted that, in other embodiments of the present invention, the heat exchange tube in the phase change dust removal heat exchanger may be a straight tube; the first spraying devices can be only arranged at the upper half part of the phase change dust removal heat exchanger, and can also be uniformly distributed in the circumferential direction of the inner wall of the phase change dust removal heat exchanger; the second spraying device and the packing layer can be distributed in one layer in the cyclone scrubber or can be distributed in two layers alternately; the filter can also be a drum filter or a belt filter.
The above-mentioned embodiments only represent some embodiments of the present invention, and the description thereof is specific and detailed, but not to be construed as limiting the scope of the present invention. It should be noted that, for those skilled in the art, without departing from the spirit of the present invention, several variations and modifications can be made, which are within the scope of the present invention. Therefore, the protection scope of the present invention should be subject to the appended claims.
Claims (10)
1. The utility model provides an aluminium hydroxide roasting furnace flue gas phase transition dust removal waste heat recovery device, includes phase transition dust removal heat exchanger, phase transition dust removal heat exchanger has the first drain hole that is used for discharging the sewage after the cooling, phase transition dust removal heat exchanger's air inlet and the corresponding flue gas discharge port of roasting the stove are connected its characterized in that of roasting: and the gas outlet of the phase-change dust removal heat exchanger is connected with a cyclone scrubber, so that secondary dust removal and heat exchange of the flue gas passing through the phase-change dust removal heat exchanger are realized.
2. The aluminum hydroxide roaster flue gas phase change dust removal waste heat recovery device of claim 1, characterized in that: and a first spraying device for accelerating the phase change to separate out dust-containing small liquid drops is arranged in the phase change dust removal heat exchanger.
3. The aluminum hydroxide roasting furnace flue gas phase change dust removal waste heat recovery device of claim 2, characterized in that: and porous plates for enabling smoke to uniformly and stably enter and exit are arranged at positions, close to the air inlet and the exhaust port, in the phase-change dust removal heat exchanger.
4. The aluminum hydroxide roaster flue gas phase change dust removal waste heat recovery device as claimed in any one of claims 1 to 3, wherein: and a second spraying device for washing the flue gas is arranged in the cyclone washer, and a packing layer for prolonging the flue gas washing retention time and the contact area is arranged below the second spraying device in the cyclone washer.
5. The aluminum hydroxide roaster flue gas phase change dust removal waste heat recovery device of claim 4, wherein: the filler of the filler layer is a polyhedral hollow sphere.
6. The aluminum hydroxide roaster flue gas phase change dust removal waste heat recovery device of claim 4, wherein: the aluminum hydroxide roaster flue gas phase change dust removal waste heat recovery device further comprises a sedimentation tank communicated with the first drainage port, a slurry discharge port for discharging sediments is formed in the bottom of the sedimentation tank, and the slurry discharge port is connected to a filter for filtering and washing slurry through a pipeline so as to realize reutilization.
7. The aluminum hydroxide roaster flue gas phase change dust removal waste heat recovery device of claim 6, characterized in that: and a slurry valve for adjusting the flow is arranged on a pipeline between the slurry discharge port and the filter.
8. The aluminum hydroxide roaster flue gas phase change dust removal waste heat recovery device of claim 6, characterized in that: and a clear water outlet for discharging clear water after precipitation is arranged on the side surface of the sedimentation tank, and the clear water outlet is connected with a clear water tank for storing water through a pipeline.
9. The aluminum hydroxide roasting furnace flue gas phase change dust removal waste heat recovery device of claim 8, characterized in that: and a water outlet of a heat exchange medium of the phase change dust removal heat exchanger is connected with the clean water tank.
10. The aluminum hydroxide roaster flue gas phase change dust removal waste heat recovery device of claim 9, wherein: the bottom of the cyclone scrubber is provided with a second sewage discharge outlet which is used for discharging sewage and communicated with the sedimentation tank, and the clean water tank is communicated with the second spraying device through a pipeline, so that the water resource can be recycled.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020743920.3U CN212058351U (en) | 2020-05-08 | 2020-05-08 | Aluminum hydroxide roasting furnace flue gas phase change dust removal waste heat recovery device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020743920.3U CN212058351U (en) | 2020-05-08 | 2020-05-08 | Aluminum hydroxide roasting furnace flue gas phase change dust removal waste heat recovery device |
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| CN212058351U true CN212058351U (en) | 2020-12-01 |
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| CN202020743920.3U Active CN212058351U (en) | 2020-05-08 | 2020-05-08 | Aluminum hydroxide roasting furnace flue gas phase change dust removal waste heat recovery device |
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