CN217110220U - Energy-saving titanium dioxide flash drying system - Google Patents
Energy-saving titanium dioxide flash drying system Download PDFInfo
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- CN217110220U CN217110220U CN202123342458.XU CN202123342458U CN217110220U CN 217110220 U CN217110220 U CN 217110220U CN 202123342458 U CN202123342458 U CN 202123342458U CN 217110220 U CN217110220 U CN 217110220U
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Abstract
The utility model discloses an energy-saving titanium white powder flash drying system belongs to titanium white powder production technical field. Including flash dryer, hot-blast furnace and flash dry bag filter, still include air heater, last tail gas import, tail gas export, fresh air import and the fresh air export of being provided with of air heater, the tail gas import communicates with the air outlet of flash dry bag filter, the tail gas exit linkage has flash dry tail gas fan, the fresh air access connection has the air-blower, the fresh air exit linkage has combustion-supporting air system, combustion-supporting air system is connected with the hot-blast furnace, the hot-blast furnace is connected with the air supply, the air outlet of hot-blast furnace and flash dryer's air intake intercommunication, flash dryer's discharge gate and flash dry bag filter's feed inlet are connected, and flash dry bag filter's discharge gate is connected with the flash dry storage tank. The system recovers the waste heat in the tail gas of the flash dry bag filter, improves the temperature of combustion-supporting air, greatly reduces the cost of flash dry gas, and does not influence the product quality.
Description
Technical Field
The utility model belongs to the technical field of titanium white powder production, concretely relates to energy-saving titanium white powder flash drying system.
Background
The flash evaporation drying production of the titanium dioxide is that hot air enters the bottom of a dryer and forms a powerful rotary wind field under the drive of a stirrer. The wet titanium dioxide (three-washing filter cake) is put on a belt conveyer from a storage bin and then is sent into a dryer from a spiral feeder, and under the action of a stirrer, the wet titanium dioxide is dispersed and crushed, and is fully contacted with hot air, heated and dried. And under the action of a draught fan, the dried titanium dioxide is brought to a flash evaporation bag for dust collection treatment.
In the current titanium dioxide industry, the water content of the three-washing filter cake is about 35%, the three-washing filter cake is dried and crushed by using heat generated by mixed combustion of primary combustion-supporting air, secondary combustion-supporting air and coal gas in flash drying, and then the three-washing filter cake enters a flash drying bag filter for dust collection treatment. The inlet temperature of the flash-dry bag filter is about 130 ℃, the outlet temperature of the flash-dry bag filter is about 100 ℃, and the working condition air quantity is 50000m 3 H is used as the reference value. In the prior art, the flash-dried tail gas discharged by the flash-dried bag filter is directly discharged into the atmosphere without any waste heat recovery, so that energy is seriously wasted, and a large amount of heat sources are wasted. On the other hand, in the prior art, because normal-temperature air is used as the flash-dry combustion-supporting air, the temperature of the mixed fresh air of the gas hot blast stove is very low (namely, the normal temperature is about 16.3 ℃), the gas consumption is large, and the cost is high.
But because the oxygen content is less than the air in the flash dry tail gas, water vapor content is higher, if the flash dry tail gas directly uses as combustion-supporting wind, can influence flash dry coal gas combustion efficiency, when the damage appears in flash dry bag filter bag in addition, the dust can get into the tail gas, directly uses the tail gas as combustion-supporting wind can influence product quality.
SUMMERY OF THE UTILITY MODEL
To the atmosphere is directly discharged into to flash drying tail gas among the prior art, the serious extravagant problem of energy, the utility model provides an energy-saving titanium dioxide flash drying system, its aim at: the waste heat of the flash drying tail gas is recycled, so that the consumption of flash drying gas is reduced, energy is saved, and the product quality is improved.
The utility model adopts the technical scheme as follows:
the utility model provides an energy-saving titanium white powder flash drying system, includes flash dryer, hot-blast furnace and flash bag filter, still includes air heater, last tail gas import, the tail gas export of being provided with of air heater, fresh air import and the fresh air export, the tail gas import communicates with the air outlet of flash bag filter, the tail gas export is connected with flash tail gas fan, the fresh air access connection has the air-blower, the fresh air exit linkage has combustion-supporting air system, combustion-supporting air system is connected with the hot-blast furnace, the hot-blast furnace is connected with the air supply, the air outlet of hot-blast furnace and flash dryer's air intake intercommunication, flash dryer's discharge gate and flash bag filter's feed inlet are connected, and flash bag filter's discharge gate is connected with the flash storage tank.
After the technical scheme is adopted, the waste heat in the tail gas of the flash drying bag filter can be recovered through the air preheater, the heat in the tail gas is used for heating the fresh air, the fresh air with the temperature of about 17 ℃ is subjected to heat exchange to about 70 ℃, and then the heat is used as the combustion-supporting air of the gas hot blast stove, so that the temperature of the combustion-supporting air is increased, and the cost of flash drying gas is greatly reduced. Reduce gas consumption by 41.3m 3 And/t, the cost is reduced by 14.05 yuan/t, and the annual benefit of a single set of system is 50.58 ten thousand yuan. And the heat exchanger is used for exchanging heat and recovering the waste heat of the tail gas to replace the direct recovery of the tail gas, so that the influence on the product quality can be avoided.
Preferably, the combustion-supporting air system comprises a combustion-supporting fan and a first air filter, the combustion-supporting fan and the hot blast stove are sequentially communicated through a pipeline, and a pipeline between the air filter and the combustion-supporting fan is communicated with a fresh air outlet of the air preheater.
After the optimized scheme is adopted, the preheated fresh air is drained by the combustion fan and then is fully mixed and combusted with the coal gas in the hot blast stove, so that the temperature of the combustion air is increased, and the coal gas consumption of the hot blast stove during combustion is reduced.
Preferably, the hot blast stove is connected with a second air filter.
After the preferred scheme is adopted, impurities in the air can be prevented from entering the system.
Preferably, an air supplementing valve is arranged on a pipeline between the flash dryer and the flash bag filter.
After the preferred scheme is adopted, the air inlet amount can be adjusted through the air supplementing valve, so that the temperature in the flash drying bag filter can be adjusted.
Preferably, the flash-dry tail gas fan is connected with a spray tower, a spray device is arranged in the spray tower, the spray tower is connected with a washing circulation tank, a discharge port of the washing circulation tank is connected with a titanium recovery device, and an overflow port of the washing circulation tank is connected with the spray device.
After the preferred scheme is adopted, the flash-dried tail gas is treated by the spray tower and the washing circulation tank, and then enters the titanium recovery device to recover titanium in the tail gas, so that the resource is recycled, the spray water can be recycled, and the waste of water resources is reduced.
Preferably, the air inlet of the flash dry bag filter is connected with an air storage tank, and the air storage tank is connected with an air compression station.
After the optimal selection scheme is adopted, the flash dry bag filter can be subjected to back blowing through compressed air, materials attached to the surface of the filter bag are blown down, and the influence on the normal operation of the system due to the fact that the air permeability of the filter bag is reduced due to the attachment of the materials is avoided.
Preferably, an air chute or a screw conveyor is arranged between the discharge port of the flash drying bag filter and the flash drying storage tank.
After the preferred scheme is adopted, products of different models can be conveyed to different flash drying storage tanks through an air chute or a screw conveyor so as to adapt to the different flowability differences of the products of different models.
Preferably, the feed inlet of flash dryer is connected with flash-dry feeding spiral, flash-dry feeding spiral is connected with the feeding chute, the feed inlet of feeding chute is connected with the bin outlet of three-wash pressure filter.
After the preferred scheme is adopted, the three-washing filter cake discharged by the three-washing filter press can be conveyed to the flash evaporation dryer through the feeding chute and the flash drying feeding screw.
Further preferably, the air preheater is a phase change heat exchanger, so that the heat exchange efficiency is higher.
Further preferably, the gas source is coal gas and/or liquefied gas.
To sum up, owing to adopted above-mentioned technical scheme, the beneficial effects of the utility model are that:
1. the utility model discloses an air heater can retrieve the waste heat in the tail gas of flash bag filter, and the heat in the tail gas is used for heating fresh air, with the fresh air heat transfer about 17 ℃ to about 70 ℃, uses as the combustion-supporting wind of coal gas hot-blast furnace again, has improved combustion-supporting wind temperature, greatly reduced flash dry coal gas cost. Reduce gas consumption by 41.3m 3 And/t, the cost is reduced by 14.05 yuan/t, and the annual benefit of a single set of system is 50.58 ten thousand yuan.
2. The utility model discloses use the heat exchanger heat transfer to retrieve the tail gas waste heat, replace direct recovery tail gas, can avoid influencing product quality.
3. After the flash-dried tail gas is treated by the spray tower and the washing circulation tank, the flash-dried tail gas enters the titanium recovery device to recover titanium in the tail gas, so that the resource is recycled, the spray water can be recycled, and the waste of water resources is reduced.
Drawings
The invention will now be described, by way of example, with reference to the accompanying drawings, in which:
FIG. 1 is a flow chart of the process of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all the embodiments. The components of the embodiments of the present application, generally described and illustrated in the figures herein, can be arranged and designed in a wide variety of different configurations. Thus, the following detailed description of the embodiments of the present application, presented in the accompanying drawings, is not intended to limit the scope of the claimed application, but is merely representative of selected embodiments of the application. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the present application without making any creative effort, shall fall within the protection scope of the present application.
In the description of the embodiments of the present application, it should be noted that the terms "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings or orientations or positional relationships that the products of the present invention are usually placed in when used, and are only used for convenience of description and simplification of the description, but do not indicate or imply that the devices or elements indicated must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present application. Furthermore, the terms "first," "second," "third," and the like are used solely to distinguish one from another and are not to be construed as indicating or implying relative importance.
The present invention will be described in detail with reference to fig. 1.
The utility model provides an energy-saving titanium white powder flash drying system, as shown in figure 1, includes flash dryer, hot-blast furnace and flash bag filter, still includes air heater, last tail gas import, tail gas export, fresh air import and the fresh air export of being provided with of air heater, the tail gas import communicates with the air outlet of flash bag filter, the tail gas exit linkage has flash dry tail gas fan, the fresh air access connection has the air-blower, the fresh air exit linkage has combustion-supporting air system, combustion-supporting air system is connected with the hot-blast furnace, the hot-blast furnace is connected with the air supply, the air outlet of hot-blast furnace communicates with flash dryer's air intake, and flash dryer's discharge gate and flash bag filter's feed inlet are connected, and flash dryer's discharge gate is connected with the flash storage tank.
In this embodiment, the combustion-supporting air system includes a combustion-supporting fan and a first air filter, the combustion-supporting fan and the hot blast stove are sequentially communicated through a pipeline, and a pipeline between the air filter and the combustion-supporting fan is communicated with a fresh air outlet of the air preheater.
The hot blast stove is connected with a second air filter for preventing impurities in the air from entering the system
And an air supplementing valve is arranged on a pipeline between the flash dryer and the flash bag filter and used for adjusting the temperature in the flash bag filter.
The flash-dry tail gas fan is connected with a spray tower, a spray device is arranged in the spray tower, the spray tower is connected with a washing circulation tank, a discharge port of the washing circulation tank is connected with a titanium recovery device, and an overflow port of the washing circulation tank is connected with the spray device.
The air inlet of the flash bag filter is connected with an air storage tank, the air storage tank is connected with an air compression station, compressed air is provided through the air compression station to blow back the flash bag filter, materials attached to the surface of the flash bag filter are blown down, and the problem that the air permeability of the filter bag is reduced due to the attachment of the materials, so that the normal operation of the system is affected is avoided.
And a discharge port of the flash bag filter is connected with a 996 flash storage tank or a 952 flash storage tank, if the flash storage tank is 996 flash storage tank, the product is conveyed through an air chute, and if the flash storage tank is 952 flash storage tank, the product is conveyed through a screw conveyor.
The feed inlet of flash dryer is connected with flash feed spiral, flash feed spiral is connected with the feeding chute, the feed inlet and the bin outlet of three washing pressure filters of feeding chute are connected.
In this embodiment, the air preheater is a phase change heat exchanger, and the gas source is coal gas and liquefied gas.
The working principle of the utility model is as follows:
and the three-washing filter cakes generated by the three-washing filter press enter the flash evaporation drying agent to be crushed and dried through the feeding chute and the flash evaporation feeding screw in sequence. And sending the dried titanium dioxide into a flash-dry belt filter for dust collection treatment. And the titanium dioxide after dust collection enters an air chute or a spiral conveyer through a discharge hole of the flash drying belt filter and is conveyed to a flash drying storage tank for storage. Tail gas of the flash drying belt filter enters an air preheater to preheat fresh air fed by a blower separately, the temperature of the fresh air is preheated to about 70 ℃ from normal temperature, the preheated fresh air is taken as a combustion-supporting seal and enters a hot air furnace through a combustion-supporting fan to be mixed with coal gas, the temperature of the coal gas is increased, and therefore the coal gas consumption during combustion of the hot air furnace is reduced. And a tail gas outlet of the air preheater is drained by a flash-dry tail gas fan and then enters a spray tower for treatment, the treated clean gas is discharged into the air, and meanwhile, the titanium element in the spray water is recovered, and the spray water can be recycled.
The above-mentioned embodiments only express the specific embodiments of the present application, and the description thereof is more specific and detailed, but not construed as limiting the scope of the present application. It should be noted that, for those skilled in the art, without departing from the technical idea of the present application, several changes and modifications can be made, which are all within the protection scope of the present application.
Claims (7)
1. An energy-saving titanium dioxide flash drying system comprises a flash dryer, a hot blast stove and a flash bag filter, and is characterized by further comprising an air preheater, wherein the air preheater is provided with a tail gas inlet, a tail gas outlet, a fresh air inlet and a fresh air outlet, the tail gas inlet is communicated with an air outlet of the flash bag filter, the tail gas outlet is connected with a flash tail gas fan, the fresh air inlet is connected with a blower, the fresh air outlet is connected with a combustion-supporting air system, the combustion-supporting air system is connected with the hot blast stove, the hot blast stove is connected with an air source, an air outlet of the hot blast stove is communicated with an air inlet of the flash dryer, a discharge port of the flash dryer is connected with a feed inlet of the flash bag filter, and a discharge port of the flash bag filter is connected with a flash storage tank; the combustion-supporting air system comprises a combustion-supporting fan and a first air filter, the combustion-supporting fan and the hot blast stove are sequentially communicated through a pipeline, the pipeline between the air filter and the combustion-supporting fan is communicated with a fresh air outlet of the air preheater, and the hot blast stove is connected with a second air filter.
2. The flash drying system for titanium dioxide powder with energy saving function as claimed in claim 1, wherein: and an air supplementing valve is arranged on a pipeline between the flash dryer and the flash bag filter.
3. The energy-saving titanium dioxide flash drying system according to claim 1, characterized in that: the flash-dry tail gas fan is connected with a spray tower, a spray device is arranged in the spray tower, the spray tower is connected with a washing circulation tank, a discharge port of the washing circulation tank is connected with a titanium recovery device, and an overflow port of the washing circulation tank is connected with the spray device.
4. The energy-saving titanium dioxide flash drying system according to claim 1, characterized in that: and an air inlet of the flash dry bag filter is connected with an air storage tank, and the air storage tank is connected with an air compression station.
5. The energy-saving titanium dioxide flash drying system according to claim 1, characterized in that: an air chute or a screw conveyor is arranged between the discharge port of the flash drying bag filter and the flash drying storage tank.
6. The energy-saving titanium dioxide flash drying system according to claim 1, characterized in that: the feed inlet of flash dryer is connected with flash feed spiral, flash feed spiral is connected with the feeding chute, the feed inlet and the bin outlet of three washing pressure filters of feeding chute are connected.
7. The energy-saving titanium dioxide flash drying system according to claim 1, characterized in that: the air preheater is a phase change heat exchanger.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202123342458.XU CN217110220U (en) | 2021-12-28 | 2021-12-28 | Energy-saving titanium dioxide flash drying system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202123342458.XU CN217110220U (en) | 2021-12-28 | 2021-12-28 | Energy-saving titanium dioxide flash drying system |
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| Publication Number | Publication Date |
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| CN217110220U true CN217110220U (en) | 2022-08-02 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202123342458.XU Active CN217110220U (en) | 2021-12-28 | 2021-12-28 | Energy-saving titanium dioxide flash drying system |
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| CN (1) | CN217110220U (en) |
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- 2021-12-28 CN CN202123342458.XU patent/CN217110220U/en active Active
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