CN215725158U - Low-energy-consumption combustion system of gas-state suspension roasting furnace - Google Patents
Low-energy-consumption combustion system of gas-state suspension roasting furnace Download PDFInfo
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- CN215725158U CN215725158U CN202121943982.XU CN202121943982U CN215725158U CN 215725158 U CN215725158 U CN 215725158U CN 202121943982 U CN202121943982 U CN 202121943982U CN 215725158 U CN215725158 U CN 215725158U
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E20/00—Combustion technologies with mitigation potential
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Abstract
The utility model relates to the field of roasting furnaces, in particular to a low-energy-consumption combustion system of a gaseous suspension roasting furnace, which comprises a roasting furnace, a combustion station, a centrifugal fan, a four-stage cooling cyclone cylinder and a spiral air pipeline spirally wound on the outer wall of the four-stage cooling cyclone cylinder, wherein the air inlet of the centrifugal fan is communicated with the outside air, the air outlet of the centrifugal fan is communicated with the air inlet of the spiral air pipeline, the air outlet of the spiral air pipeline is connected with the air inlet of the combustion station, the fuel inlet of the combustion station is communicated with a gas pipeline, and the fuel outlet of the combustion station is communicated with the fuel inlet of the roasting furnace. The utility model can preheat the heat released by the finished product alumina in the four-stage cooling cyclone cylinder into the air for combustion in the combustion station, thereby reducing the energy consumption of the combustion system.
Description
Technical Field
The utility model relates to the technical field of roasting furnaces, in particular to a low-energy-consumption combustion system of a gaseous suspension roasting furnace.
Background
At present, the gas suspension roasting furnace is a conical bottom cylindrical container built with a lining. The whole calcining system of the gaseous suspension roaster consists of a Venturi current-carrying dryer, a two-stage cyclone preheater, a gaseous suspension roaster with cyclone separation, a four-stage cyclone cooler, a secondary fluidized bed cooler and an electric dust collection and dust return system. The whole device adopts the technology of negative pressure operation and dilute phase fluidization roasting furnace. Wet aluminium hydroxide is firstly dried in a Venturi current-carrying dryer, the dried material is preheated in a secondary cyclone preheater after gas-solid separation in a primary cyclone preheater and part of crystal water is removed, the preheated material enters a roasting furnace along the direction parallel to a cone bottom, finally roasting is completed in the roasting furnace, and the roasted finished product aluminium oxide is cooled by a four-stage cooling cyclone cylinder and then is sent to the next stage. Preheated air for combustion enters from the bottom of the furnace through a single tube at a velocity of 5m/s, and the gas mixes with the preheated air and is ignited in the cone of the furnace. In the roasting furnace, the aluminum hydroxide is roasted at the high temperature of about 1050 ℃, the gas-solid contact is good, the heat transfer speed is high, and the heat transfer coefficient between gas and solid is high. Therefore, the roasting process can be completed within 1-2 s.
The original design production capacity of the roasting furnace is 1850t/d, the continuous and stable production capacity is 2300t/d, and the production capacity of the alumina roasting furnace is required to be continuously improved along with the increasing expansion of the production scale. Because the air volume of the centrifugal fan has a margin, the capacity of the roasting furnace is increased by about 400t/d through the adjustment of the separator and the dust removal and ash return amount, but the improvement of the capacity can cause the lining of the roasting furnace to be washed away, so that the heat preservation and heat insulation effect of the lining is poor, and the heat loss is serious. Meanwhile, the combustion station of the roasting furnace is provided with an independent centrifugal fan to directly blow air into the combustion station, namely the air temperature is about 35 ℃, the air directly enters the combustion station to be mixed with gas, and the air temperature is low, so that the temperature in the roasting furnace is not influenced, the quality of products is not influenced, and more gas is consumed to increase the temperature in the furnace. The surface temperature of the fourth-stage cooling cyclone of the roasting furnace C04 is about 200 ℃, the internal alumina temperature is up to 360 ℃, the heat recovery is incomplete only by external heat preservation, the heat is not completely recovered and utilized, the heat source loss is caused, and the service life of alumina conveying equipment is influenced by the high discharge temperature.
SUMMERY OF THE UTILITY MODEL
The utility model aims to solve the problems and provides a low-energy-consumption combustion system of a gaseous suspension roasting furnace, which can preheat air entering a combustion station for combustion from heat released by finished alumina in a four-stage cooling cyclone and reduce the energy consumption of the combustion system.
In order to achieve the purpose, the technical scheme adopted by the utility model is as follows: a combustion system of a low-energy-consumption gas-state suspension roasting furnace comprises a roasting furnace, a combustion station, a centrifugal fan, a four-stage cooling cyclone cylinder and a spiral air pipeline spirally wound on the outer wall of the four-stage cooling cyclone cylinder, wherein an air inlet of the centrifugal fan is communicated with outside air, an air outlet of the centrifugal fan is communicated with an air inlet of the spiral air pipeline, an air outlet of the spiral air pipeline is connected with an air inlet of the combustion station, a fuel inlet of the combustion station is communicated with a gas pipeline, and a fuel outlet of the combustion station is communicated with a fuel inlet of the roasting furnace.
Furthermore, a first control valve is arranged on a connecting pipeline of an air inlet of the combustion station.
Furthermore, a second control valve is arranged on a connecting pipeline of a fuel inlet of the combustion station.
Furthermore, the first control valve and the second control valve are both electric or pneumatic butterfly valves.
Furthermore, an insulating layer is arranged on the inner wall of the roasting furnace.
Further, the heat preservation includes the follow the cotton layer of heat preservation, aluminium silicate fiberboard/blanket layer and the plastic material layer that the inner wall of burning furnace outwards set gradually, the cotton layer of heat preservation, aluminium silicate fiberboard/blanket layer and plastic material layer paste as an organic wholely each other, a plurality of Y shapes of having arranged at intervals in heat preservation cotton, aluminium silicate fiberboard/blanket and the plastic material layer are grabbed the nail, each the nail is grabbed to Y shape follows the cotton layer of heat preservation extends to but plastic layer and its V-arrangement portion arrange in the plastic material is in situ, the tip of the nail is grabbed to Y shape "I" shape portion with the furnace body welding of burning furnace is as an organic whole.
Further, the heat insulation cotton layer is made of nanocrystal heat insulation cotton.
Further, the plastic layer is corundum wear-resistant refractory plastic.
Further, the thickness of the plastic layer is 15 cm.
Due to the adoption of the technical scheme, the utility model has the following beneficial effects:
according to the utility model, the spiral air pipeline is wound on the outer wall of the four-stage cooling cyclone cylinder, air at the air outlet of the centrifugal fan is introduced into the spiral air pipeline, so that cold air is directly contacted with the outer wall of the four-stage cooling cyclone cylinder for heat exchange, heat released by finished product alumina in the four-stage cooling cyclone cylinder is used for preheating air entering a combustion station for combustion, the air temperature is increased to about 90 ℃ from about 35 ℃, the air temperature entering the combustion station is increased, fuel gas and preheated air for combustion are mixed in the combustion station and enter a roasting furnace to be ignited at the conical part of the roasting furnace, and because the air temperature entering the combustion station is increased, the cold air is reduced to directly enter the furnace for roasting, the fuel gas consumption is reduced, and the energy consumption of a combustion system is reduced; meanwhile, under the condition of the same blanking amount, the temperature of the materials in the four-stage cooling cyclone is reduced to about 300 ℃ from 360 ℃ after heat exchange, the discharging temperature is reduced, and the service life of the alumina conveying equipment is prevented from being influenced by the high discharging temperature.
Drawings
FIG. 1 is a schematic structural diagram of a combustion system of a low-energy consumption gaseous suspension roaster according to the present invention;
FIG. 2 is a schematic sectional structure view of the insulating layer on the inner wall of the roasting furnace according to the present invention;
the reference numbers in the figures are: 1-roasting furnace, 11-furnace body, 12-heat preservation cotton layer, 13-aluminum silicate fiber board/blanket, 14-plastic layer, 2-four-stage cooling cyclone cylinder, 3-centrifugal fan, 4-combustion station, 5-spiral air pipeline, 6-first valve, 7-second valve and 8-gas pipeline.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
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 a component is referred to as being "connected" to another component, it can be directly connected to the other component or intervening components may also be present. When a component is referred to as being "disposed on" another component, it can be directly on the other component or intervening components may also be present. The terms "vertical," "horizontal," "left," "right," and the like as used herein are for illustrative purposes only.
As shown in fig. 1 and 2, a low-energy consumption combustion system of a gaseous suspension roasting furnace includes a roasting furnace 1, a combustion station 4, a centrifugal fan 3, a four-stage cooling cyclone 2, and a spiral air duct 5 spirally wound on an outer wall of the four-stage cooling cyclone 2, an air inlet of the centrifugal fan 3 is communicated with outside air, an air outlet of the centrifugal fan 3 is communicated with an air inlet of the spiral air duct 5, an air outlet of the spiral air duct 5 is connected with an air inlet of the combustion station 4, a fuel inlet of the combustion station 4 is communicated with a gas duct 8, and an air outlet of the combustion station 4 is connected with a fuel inlet of the roasting furnace 1.
During the roasting process, the gas and the preheated air for combustion are mixed in the combustion station 4 and enter the roasting furnace 1 and are ignited in the cone of the roasting furnace 1. A combustion station 4 of an original roasting furnace 1 is provided with an independent centrifugal fan 3 for blowing air to the combustion station 4 for combustion supporting, namely, the air temperature is about 35 ℃, the air directly enters the combustion station 4 to be mixed with gas, and the air temperature is low, so that the temperature in the roasting furnace 1 is not influenced, the quality of products is not influenced, and the temperature in the furnace is increased by consuming more gas. The cold air at the outlet of the centrifugal fan 3 is led to the spiral air pipeline 5 wound on the outer wall of the four-stage cooling cyclone cylinder 2, so that the cold air is directly contacted with the outer wall of the four-stage cooling cyclone cylinder 2 for heat exchange, the heat released by the finished product alumina in the four-stage cooling cyclone cylinder 2 is used for preheating the air entering the combustion station for combustion, the temperature of the air entering the combustion station 4 is increased from about 35 ℃ to about 90 ℃, and the cold air is reduced from directly entering the roasting furnace 1 due to the increase of the temperature of the preheated air in the combustion station 4, so that the using amount of fuel gas is reduced. Meanwhile, under the condition of the same blanking amount, the temperature of the materials in the four-stage cooling cyclone 2 is reduced to about 300 ℃ from 360 ℃ after heat exchange, the discharging temperature is reduced, and the service life of the alumina conveying equipment is prevented from being influenced by the high discharging temperature.
And a first control valve 6 is arranged on a connecting pipeline of an air inlet of the combustion station 4. And a second control valve 7 is arranged on a connecting pipeline of a fuel inlet of the combustion station 4. The first control valve 6 and the second control valve 7 adopt electric or pneumatic butterfly valves. The first and second control valves are respectively used for controlling the flow of combustion air entering the combustion station 4 and the flow of gas entering the combustion station 4.
And the inner wall of the roasting furnace 1 is also provided with a heat-insulating layer. Through set up the heat preservation on the oven, improve the oven heat preservation effect, reduce heat energy loss, reduce the fuel quantity, further reduce the energy consumption. Preferably, the heat preservation layer comprises a heat preservation cotton layer 12, an aluminum silicate fiber board/blanket layer 13 and a plastic layer 14 which are sequentially arranged from the inner wall of the roasting furnace 1 to the outside, the heat preservation cotton layer 12, the aluminum silicate fiber board/blanket layer 13 and the plastic layer 14 are adhered to each other into a whole, a plurality of Y-shaped gripping nails 15 are arranged in the heat preservation cotton layer 12, the aluminum silicate fiber board/blanket layer 13 and the plastic layer 14 at intervals, each Y-shaped gripping nail 15 extends from the heat preservation cotton layer 12 to the plastic layer 14, the V-shaped portion of each Y-shaped gripping nail 15 is arranged in the plastic layer 14, and the end of the I-shaped portion of each Y-shaped gripping nail 15 is welded with the furnace body 11 of the roasting furnace 1 into a whole. The heat-insulating layer is fixed with the furnace wall by Y-shaped gripping nails 15. Preferably, the heat insulation cotton layer 12 is nanocrystal heat insulation cotton. The plastic layer 14 is corundum wear-resistant refractory plastic. The thickness of the plastic layer 14 is 15 cm.
The heat preservation comprises heat preservation cotton layer 12, aluminium silicate fiberboard/blanket layer 13 and plastic layer 14, and the aluminium silicate fiber in intermediate level has better toughness, can prevent the hot impact force in the furnace, and the aluminium silicate fiber has light in weight, the stable and low coefficient of heat conductivity's of chemical property advantage, light in weight easy to assemble, and the chemical property is stable guarantees that it can not cause the harm to the fibre in rapid heating and cooling, has good heat stability: the low heat conductivity coefficient can greatly reduce the heat transfer area, increase the thermal resistance and improve the heat preservation effect.
The working principle of the utility model is as follows:
cold air at the outlet of the centrifugal fan 3 enters a spiral air pipeline 5 wound on the outer wall of the cooling cyclone cylinder 2, the cold air directly contacts with the outer wall of the four-stage cooling cyclone cylinder 2 to exchange heat, the air temperature is increased to about 90 ℃ from about 35 ℃, the cold air enters the combustion station 4 to support combustion after the flow is controlled by the first control valve 6, and gas enters the combustion station 4 to be mixed after the flow is controlled by the second control valve 7 and enters the roasting furnace 1 to be ignited at the cone part of the roasting furnace 1. Because the cold air of the centrifugal fan 3 is heated by reducing the waste heat of the outer wall of the four-stage cooling cyclone cylinder 2, the temperature of the combustion air entering the combustion station 4 is improved, and the cold air is prevented from directly entering the combustion station 4, thereby reducing the consumption of fuel gas and reducing the energy consumption of a combustion system. Meanwhile, under the condition of the same blanking amount, the temperature of the materials in the four-stage cooling cyclone 2 is reduced from 360 ℃ to about 300 ℃ after heat exchange, the discharging temperature is reduced, and the service life of the alumina conveying equipment is prolonged. In addition, the heat preservation layer is arranged on the furnace wall of the combustion furnace 1, so that the heat preservation effect of the furnace wall is improved, the loss of heat in the combustion furnace is reduced, the use of fuel gas is reduced, and the energy consumption of a combustion system is further reduced.
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 utility model herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the utility model. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
Claims (9)
1. The utility model provides a burning system of low energy consumption gaseous suspension roasting furnace, includes the roasting furnace, the burning station, centrifugal fan and the level four cooling cyclone, its characterized in that: the air outlet of the spiral air pipeline is connected with the air inlet of the combustion station, the fuel inlet of the combustion station is communicated with the fuel gas pipeline, and the fuel outlet of the combustion station is communicated with the fuel inlet of the roasting furnace.
2. A low energy consumption combustion system for a gaseous suspension roaster according to claim 1, wherein: and a first control valve is arranged on a connecting pipeline of an air inlet of the combustion station.
3. A low energy consumption combustion system for a gaseous suspension roaster according to claim 2, wherein: and a second control valve is arranged on a connecting pipeline of a fuel inlet of the combustion station.
4. A low energy consumption combustion system for a gaseous suspension roaster according to claim 3, wherein: the first control valve and the second control valve are both electric or pneumatic butterfly valves.
5. A low energy consumption combustion system for a gaseous suspension roaster according to claim 1, wherein: and the inner wall of the roasting furnace is also provided with a heat-insulating layer.
6. A low energy consumption combustion system for a gaseous suspension roaster according to claim 5, wherein: the heat preservation includes the follow the cotton layer of heat preservation, aluminium silicate fiberboard blanket layer and the plastic material layer that the inner wall of burning furnace outwards set gradually, it is as an organic whole that cotton layer, aluminium silicate fiberboard blanket layer and the plastic material layer of heat preservation paste each other, a plurality of Y shape nails of having arranged at intervals in cotton, aluminium silicate fiberboard blanket and the plastic material layer of heat preservation, each the Y shape nail of grabbing follows the cotton layer of heat preservation extends to but plastic layer and its V-arrangement portion arrange in the plastic material is in situ, the tip of the nail is grabbed to Y shape "I" shape portion with the furnace body welding of burning furnace is as an organic whole.
7. The combustion system of the low energy consumption gaseous suspension roaster of claim 6, wherein: the heat preservation cotton layer is made of nanocrystal heat preservation cotton.
8. The combustion system of the low energy consumption gaseous suspension roaster of claim 6, wherein: the plastic layer is corundum wear-resistant refractory plastic.
9. The combustion system of the low energy consumption gaseous suspension roaster of claim 6, wherein: the thickness of the plastic layer is 15 cm.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121943982.XU CN215725158U (en) | 2021-08-18 | 2021-08-18 | Low-energy-consumption combustion system of gas-state suspension roasting furnace |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202121943982.XU CN215725158U (en) | 2021-08-18 | 2021-08-18 | Low-energy-consumption combustion system of gas-state suspension roasting furnace |
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| CN215725158U true CN215725158U (en) | 2022-02-01 |
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| CN202121943982.XU Active CN215725158U (en) | 2021-08-18 | 2021-08-18 | Low-energy-consumption combustion system of gas-state suspension roasting furnace |
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- 2021-08-18 CN CN202121943982.XU patent/CN215725158U/en active Active
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