CN110624494A - Gas-liquid reactor for improving titanium white waste acid concentration - Google Patents
Gas-liquid reactor for improving titanium white waste acid concentration Download PDFInfo
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- CN110624494A CN110624494A CN201911052591.6A CN201911052591A CN110624494A CN 110624494 A CN110624494 A CN 110624494A CN 201911052591 A CN201911052591 A CN 201911052591A CN 110624494 A CN110624494 A CN 110624494A
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Abstract
The invention belongs to the field of chemical equipment, and particularly discloses a gas-liquid reactor which is low in energy consumption and can effectively improve the concentration of titanium white waste acid. The gas-liquid reactor comprises at least three sub-reactors which are arranged in a grading manner from low to high in sequence, wherein each sub-reactor comprises a reaction cylinder and a waste acid storage tank which are connected in a circulating manner. When the titanium dioxide waste acid recycling device is used, titanium dioxide waste acid introduced into the reactor can circulate in the reaction cylinder and the waste acid storage tank and fully reacts with acidolysis tail gas introduced into the reaction cylinder so as to effectively absorb acid mist and sulfides in the acidolysis tail gas to improve the concentration, more water vapor can be generated by absorbing heat of the acidolysis tail gas and is taken away by the acidolysis tail gas to further improve the concentration, and compared with direct distillation concentration, the energy consumption is lower; in addition, the plurality of sub-reactors are arranged in a grading manner, so that titanium white waste acid can sequentially enter the sub-reactors at all levels for concentration treatment, the concentration of the titanium white waste acid can be effectively improved, the single-stage treatment time can be shortened, and the production efficiency is greatly improved.
Description
Technical Field
The invention belongs to the field of chemical equipment, and particularly relates to a gas-liquid reactor for improving the concentration of titanium white waste acid.
Background
At present, most of titanium dioxide production adopts a sulfuric acid method, but the environmental pollution problem brought by the sulfuric acid method seriously restricts the development of the titanium dioxide industry. The biggest defect of preparing titanium dioxide by a sulfuric acid method is that the three wastes are more, and particularly the waste acid amount is large; in the production process, titanium white waste acid with different concentrations is produced in different processes, and waste acid with the concentration of 17-22% is obtained by filter pressing after hydrolysis, and is also called hydrolysis waste acid or concentrated waste acid. According to incomplete statistics, 6-8 t of titanium white waste acid with the concentration of about 20% is produced in each ton of titanium white powder on average; about 20 percent of the titanium dioxide waste acid can be directly returned to the acidolysis process for acidolysis or leaching, and most of the titanium dioxide waste acid is remained to be treated. There are two main utilization routes formed from the industrialization of the sulfuric acid method for preparing titanium white in 1918 to date: direct utilization and comprehensive utilization. However, both direct utilization and comprehensive utilization indicate that the application field is wider when the waste acid concentration is higher, and the recovery value of the titanium white waste acid with lower visible concentration is not high, so that the titanium white waste acid concentration needs to be improved. The existing main method for improving the concentration of titanium white waste acid is concentration treatment, namely, evaporation equipment is adopted to evaporate water in the waste acid to concentrate the titanium white waste acid. However, the concentration treatment method has the problems of huge equipment investment, expensive equipment use and maintenance cost, high energy consumption in the concentration process and the like, so that the production cost of the product is high and the product is difficult to accept by manufacturers.
Disclosure of Invention
The invention aims to solve the technical problem of providing a gas-liquid reactor which has lower energy consumption and can effectively improve the concentration of titanium white waste acid.
The technical scheme adopted by the invention for solving the technical problems is as follows: the gas-liquid reactor for improving the concentration of the titanium white waste acid comprises at least three sub-reactors which are arranged in a grading manner from low to high in sequence; the sub-reactor comprises a reaction cylinder and a waste acid storage tank; the bottom of the reaction cylinder is provided with an acidolysis tail gas inlet, and the top of the reaction cylinder is provided with an acidolysis tail gas outlet; a waste acid spraying device with a nozzle facing the bottom of the reaction cylinder is arranged in the reaction cylinder, and a liquid inlet of the waste acid spraying device is connected with a liquid inlet of the reaction cylinder through a pipeline; a liquid inlet of the reaction cylinder is connected with a liquid outlet of a waste acid storage tank through a circulating pump, and a liquid inlet of the waste acid storage tank is connected with a liquid outlet of the reaction cylinder; the acidolysis tail gas outlet of the reaction cylinder of the sub-reactor is connected with the acidolysis tail gas inlet of the reaction cylinder of the sub-reactor at the next stage; the liquid outlet of the reaction cylinder of the sub-reactor is connected with the liquid inlet of the reaction cylinder of the sub-reactor at the previous stage through a liquid feeding pump, and the liquid outlet of the reaction cylinder of the sub-reactor at the highest stage is connected with the liquid inlet of the qualified product storage tank through a liquid discharging pump.
Furthermore, the number of the waste acid spraying devices is at least two, and the waste acid spraying devices are distributed at intervals along the height direction of the reaction cylinder.
Further, a gas distribution plate is arranged in the reaction cylinder, and at least two through holes which are uniformly distributed are formed in the gas distribution plate.
Furthermore, the number of the gas distribution plates is equal to that of the waste acid spraying devices, and each gas distribution plate is respectively positioned at the lower side of each waste acid spraying device.
Furthermore, a flow regulating valve is arranged on the connection between the circulating pump and the liquid outlet of the waste acid storage tank.
Further, still include acidolysis tail gas source and titanium dioxide waste acid source, acidolysis tail gas source passes through the draught fan and is connected with the acidolysis tail gas access of the reaction cylinder that is in the highest level sub-reactor, the titanium dioxide waste acid source is connected with the inlet that is in the reaction cylinder of the lowest level sub-reactor through titanium dioxide waste acid pump.
Further, a liquid feeding valve is arranged on the connection between the liquid feeding pump and the liquid inlet of the reaction cylinder.
Further, a liquid outlet valve is arranged on the connection between the liquid outlet pump and the liquid inlet of the qualified product storage tank.
Further, an acid concentration on-line detector is arranged in a waste acid storage tank of the highest-level sub-reactor.
The device further comprises a controller, wherein the controller is respectively and electrically connected with the acid concentration online detector, the liquid feeding pump, the liquid feeding valve, the liquid outlet pump and the liquid outlet valve; when the acid concentration on-line detector detects that the concentration of the titanium white waste acid in the waste acid storage tank reaches a set range, a signal is fed back to the controller, the controller controls the liquid outlet valve to be opened first, controls the liquid outlet pump to pump the titanium white waste acid in the highest-level sub-reactor to the qualified product storage tank, controls the liquid outlet valve to be closed and controls the liquid feeding valve to be opened, and controls the liquid feeding pump to pump the titanium white waste acid in the next-level sub-reactor to the previous-level sub-reactor.
The invention has the beneficial effects that: the sub-reactor of the gas-liquid reactor comprises a reaction cylinder and a waste acid storage tank which are connected in a circulating manner, and can ensure that titanium white waste acid introduced into the reactor circulates in the reaction cylinder and the waste acid storage tank, is continuously sprayed from top to bottom in the reaction cylinder, and fully reacts with acidolysis tail gas introduced into the reaction cylinder and flowing from bottom to top so as to effectively absorb acid mist and sulfide in the acidolysis tail gas to improve the concentration, can generate more water vapor by absorbing the heat of the acidolysis tail gas and is taken away by the acidolysis tail gas to further improve the concentration, and has lower energy consumption compared with direct distillation concentration; in addition, the number of the sub-reactors is at least three, and the sub-reactors are arranged in a grading manner from low to high in sequence, so that the titanium white waste acid can enter each sub-reactor in sequence for concentration treatment, the concentration of the titanium white waste acid can be effectively improved, the single-stage treatment time can be shortened, and the production efficiency is greatly improved.
Drawings
FIG. 1 is a schematic diagram of an embodiment of the present invention;
labeled as: the device comprises a sub-reactor 100, a reaction cylinder 110, an acidolysis tail gas inlet 111, an acidolysis tail gas outlet 112, a waste acid spraying device 113, a pipeline 114, a gas distribution plate 115, a waste acid storage tank 120, an acid concentration online detector 121, a circulating pump 130, a flow regulating valve 140, a liquid feeding pump 210, a liquid feeding valve 220, a qualified product storage tank 300, a liquid discharging pump 310 and a liquid discharging valve 320.
Detailed Description
The invention will be further explained with reference to the drawings.
As shown in fig. 1, the gas-liquid reactor for increasing the titanium dioxide waste acid concentration comprises at least three sub-reactors 100 which are arranged in a grading manner from low to high in sequence; the sub-reactor 100 comprises a reaction cylinder 110 and a waste acid storage tank 120; the bottom of the reaction cylinder 110 is provided with an acidolysis tail gas inlet 111, and the top of the reaction cylinder 110 is provided with an acidolysis tail gas outlet 112; a waste acid spraying device 113 with a nozzle facing the bottom of the reaction cylinder 110 is arranged in the reaction cylinder 110, and a liquid inlet of the waste acid spraying device 113 is connected with a liquid inlet of the reaction cylinder 110 through a pipeline 114; a liquid inlet of the reaction cylinder 110 is connected with a liquid outlet of the waste acid storage tank 120 through a circulating pump 130, and a liquid inlet of the waste acid storage tank 120 is connected with a liquid outlet of the reaction cylinder 110; an acidolysis tail gas outlet 112 of the reaction cylinder 110 of the sub-reactor 100 is connected with an acidolysis tail gas inlet 111 of the reaction cylinder 110 of the sub-reactor 100 at the next stage; the liquid outlet of the reaction cylinder 110 of the sub-reactor 100 is connected with the liquid inlet of the reaction cylinder 110 of the sub-reactor 100 at the previous stage via a liquid feeding pump 210, and the liquid outlet of the reaction cylinder 110 of the sub-reactor 100 at the highest stage is connected with the liquid inlet of the qualified product storage tank 300 via a liquid discharging pump 310.
When in use, firstly, acidolysis tail gas is introduced into the sub-reactor 100 at the highest level, and titanium white waste acid is introduced into the sub-reactor 100 at the lowest level; the acidolysis tail gas flows through the sub-reactors 100 at the middle stages from the sub-reactor 100 at the highest stage in sequence, and finally enters the sub-reactors 100 at the lowest stage to react with titanium dioxide waste acid; then, the titanium white waste acid reacted with the acidolysis tail gas is conveyed into the upper-stage sub-reactor 100 through the liquid conveying pump 210, so as to react with the acidolysis tail gas; when titanium white waste acid exists in the sub-reactor 100 at the highest level, conveying the titanium white waste acid to each sub-reactor 100 is suspended; then, the titanium white waste acid in each sub-reactor 100 is self-circulated by a circulating pump 130, continuously reacts with the introduced acidolysis tail gas, and monitors the concentration of the titanium white waste acid in the highest sub-reactor 100 on line in real time; when the concentration of the titanium white waste acid in the highest sub-reactor 100 is detected to reach a set range, the titanium white waste acid is judged to be qualified, self-circulation is suspended, and the qualified titanium white waste acid is conveyed into a qualified storage tank 300 through a liquid outlet pump 310; finally, the titanium white waste acid reacted with the acidolysis tail gas is conveyed into the upper-level sub-reactor 100 through the liquid conveying pump 210, and the titanium white waste acid to be treated is introduced into the lowest-level sub-reactor 100, and the process is circulated. The setting range is generally 25 to 30 mass percent.
Sub-reactionsThe reactor 100 comprises a reaction cylinder 110 and a waste acid storage tank 120, wherein the reaction cylinder 110 and the waste acid storage tank 120 are circularly connected through a circulating pump 130; titanium white waste acid led into the sub-reactor 100 can circulate in the reaction cylinder 110 and the waste acid storage tank 120, is continuously sprayed from top to bottom in the reaction cylinder 110 through the waste acid spraying device 113, and fully reacts with acidolysis tail gas led into the reaction cylinder 110 from bottom to top from the acidolysis tail gas inlet 111, so that the titanium white waste acid can absorb acid mist and sulfide in the acidolysis tail gas to improve the concentration, can generate more water vapor by absorbing heat of the acidolysis tail gas to be taken away by the acidolysis tail gas to improve the concentration, has lower energy consumption compared with direct distillation concentration, and can treat the acidolysis tail gas to a certain extent; the acidolysis tail gas mainly comprises water vapor, acid mist and H2S、SO2And SO3And the tail gas generated in the acidolysis process of preparing titanium dioxide by a sulfuric acid method is generally selected to improve the concentration of titanium dioxide waste acid.
This a gas-liquid reactor for improving titanium white spent acid concentration, including at least three sub-reactor 100 that sets up according to rank in proper order from low to high in grades, can make titanium white spent acid get into in proper order and carry out the concentrated processing in sub-reactor 100 at different levels, not only can effectively improve the concentration of titanium white spent acid, can shorten single-stage processing time moreover, improve production efficiency greatly.
The reaction cylinder 110 is mainly used for fully reacting titanium dioxide waste acid with acidolysis tail gas and exchanging heat and mass; the reaction cylinder 110 is generally vertically arranged, and the cross section of the reaction cylinder can be in various structures such as a circle, a rectangle, a polygon or an abnormity; the acidolysis tail gas inlet 111 is used for introducing acidolysis tail gas, and the acidolysis tail gas inlet 111 of the reaction cylinder 110 of the highest sub-reactor 100 is usually connected with an acidolysis tail gas source; the acidolysis tail gas outlet 112 is used for discharging acidolysis tail gas after reaction, and the acidolysis tail gas outlet 112 of the reaction cylinder 110 of the sub-reactor 100 at the lowest level is generally connected with a tail gas treatment device. The waste acid spraying device 113 is used for spraying titanium dioxide waste acid, which can be various, and is preferably a shower head.
In order to disperse the titanium white waste acid in the reaction cylinder 110 sufficiently, as shown in fig. 1, at least two waste acid spraying devices 113 are arranged and distributed at intervals along the height direction of the reaction cylinder 110.
On the basis, in order to make the introduced acidolysis tail gas more dispersed, a gas distribution plate 115 is further arranged in the reaction cylinder 110, and at least two through holes which are uniformly distributed are formed in the gas distribution plate 115.
Preferably, the number of the gas distribution plates 115 is equal to the number of the waste acid spray devices 113, and each gas distribution plate 115 is positioned at the lower side of each waste acid spray device 113.
In order to effectively control the process of the titanium dioxide waste acid and the acidolysis tail gas in the sub-reactor 100 for more sufficient reaction and efficiency, as shown in fig. 1, a flow control valve 140 is disposed on the connection between the circulation pump 130 and the liquid outlet of the waste acid storage tank 120. The flow control valve 140 is generally electrically connected to the controller, and the controller controls the operation state thereof.
As a preferable scheme of the present invention, the gas-liquid reactor for increasing the titanium dioxide waste acid concentration further comprises an acidolysis tail gas source and a titanium dioxide waste acid source, the acidolysis tail gas source is connected to the acidolysis tail gas inlet 111 of the reaction cylinder 110 of the sub-reactor 100 at the highest level through an induced draft fan, and the titanium dioxide waste acid source is connected to the liquid inlet of the reaction cylinder 110 of the sub-reactor 100 at the lowest level through a titanium dioxide waste acid pump. The acidolysis tail gas source may be various, for example: the equipment used in the acidolysis process for preparing titanium dioxide by a sulfuric acid method. The titanium white waste acid source is generally equipment for preparing titanium dioxide by a sulfuric acid method. The induced draft fan is used for regulating and controlling the flow velocity of the acidolysis tail gas so as to improve the reaction sufficiency of the titanium dioxide waste acid and the acidolysis tail gas in the reaction cylinder 110 and take away the effect of water vapor.
In order to facilitate the titanium white waste acid in the next sub-reactor 100 to be conveyed into the previous sub-reactor 100, as shown in fig. 1, a liquid conveying valve 220 is disposed on a connection between the liquid conveying pump 210 and the liquid inlet of the reaction cylinder 110.
In order to facilitate the transfer of the qualified titanium dioxide waste acid in the highest-level sub-reactor 100 into the qualified product storage tank 300, as shown in fig. 1, a liquid outlet valve 320 is provided on the connection between the liquid outlet pump 310 and the liquid inlet of the qualified product storage tank 300.
In order to facilitate online real-time monitoring of the titanium dioxide waste acid concentration in the highest sub-reactor 100, as shown in fig. 1, an acid concentration online detector 121 is disposed in the waste acid storage tank 120 of the highest sub-reactor 100. The acid concentration on-line detector 121, also called an intelligent on-line concentration meter or an on-line concentration transmitter, is a device for continuously measuring the concentration of liquid on line, and can be directly used in the industrial production process.
As another preferred scheme of the present invention, the gas-liquid reactor for increasing the titanium dioxide waste acid concentration further comprises a controller, wherein the controller is electrically connected to the acid concentration on-line detector 121, the liquid feeding pump 210, the liquid feeding valve 220, the liquid discharging pump 310 and the liquid discharging valve 320, respectively; when the acid concentration on-line detector 121 detects that the concentration of titanium dioxide waste acid in the waste acid storage tank 120 reaches a set range, a signal is fed back to the controller, the controller first controls the liquid outlet valve 320 to open, controls the liquid outlet pump 310 to pump titanium dioxide waste acid in the highest-level sub-reactor 100 to the qualified product storage tank 300, then controls the liquid outlet valve 320 to close, controls the liquid inlet valve 220 to open, and controls the liquid inlet pump 210 to pump titanium dioxide waste acid in the next-level sub-reactor 100 to the previous-level sub-reactor 100. Through adopting the controller to control, can improve this a gas-liquid reactor's for improving titanium white waste acid concentration degree of automation, reduce artifical intensity of labour, practice thrift the human cost.
The gas-liquid reactor for improving the concentration of the titanium white waste acid is simple and practical and has strong operability, the concentration of the titanium white waste acid can be effectively improved through acidolysis of tail gas, and the field is widened for the reutilization of the titanium white waste acid; and compared with the existing direct distillation concentration treatment mode, the energy consumption is lower, and the acidolysis tail gas can be purified.
Claims (10)
1. A gas-liquid reactor for improving titanium dioxide spent acid concentration which characterized in that: comprises at least three sub-reactors (100) which are arranged in a grading way from low to high in sequence; the sub-reactor (100) comprises a reaction cylinder (110) and a waste acid storage tank (120); an acidolysis tail gas inlet (111) is formed in the bottom of the reaction cylinder (110), and an acidolysis tail gas outlet (112) is formed in the top of the reaction cylinder (110); a waste acid spraying device (113) with a nozzle facing the bottom of the reaction cylinder (110) is arranged in the reaction cylinder (110), and a liquid inlet of the waste acid spraying device (113) is connected with a liquid inlet of the reaction cylinder (110) through a pipeline (114); a liquid inlet of the reaction cylinder (110) is connected with a liquid outlet of a waste acid storage tank (120) through a circulating pump (130), and a liquid inlet of the waste acid storage tank (120) is connected with a liquid outlet of the reaction cylinder (110); an acidolysis tail gas outlet (112) of the reaction cylinder (110) of the sub-reactor (100) is connected with an acidolysis tail gas inlet (111) of the reaction cylinder (110) of the sub-reactor (100) at the next stage; the liquid outlet of the reaction cylinder (110) of the sub-reactor (100) is connected with the liquid inlet of the reaction cylinder (110) of the sub-reactor (100) at the previous stage through a liquid feeding pump (210), and the liquid outlet of the reaction cylinder (110) of the sub-reactor (100) at the highest stage is connected with the liquid inlet of the qualified product storage tank (300) through a liquid outlet pump (310).
2. The gas-liquid reactor for increasing titanium dioxide waste acid concentration according to claim 1, wherein: the number of the waste acid spraying devices (113) is at least two, and the waste acid spraying devices are distributed at intervals along the height direction of the reaction cylinder (110).
3. The gas-liquid reactor for increasing titanium dioxide waste acid concentration according to claim 2, wherein: the reaction cylinder (110) is also internally provided with a gas distribution plate (115), and the gas distribution plate (115) is provided with at least two through holes which are uniformly distributed.
4. The gas-liquid reactor for increasing titanium dioxide waste acid concentration according to claim 3, wherein: the number of the gas distribution plates (115) is equal to that of the waste acid spraying devices (113), and each gas distribution plate (115) is respectively positioned at the lower side of each waste acid spraying device (113).
5. The gas-liquid reactor for increasing titanium dioxide waste acid concentration according to claim 1, wherein: and a flow regulating valve (140) is arranged on the connection between the circulating pump (130) and the liquid outlet of the waste acid storage tank (120).
6. The gas-liquid reactor for increasing titanium dioxide waste acid concentration according to claim 1, wherein: still include acidolysis tail gas source and titanium dioxide waste acid source, acidolysis tail gas source passes through the draught fan and is connected with acidolysis tail gas import (111) that is in reaction cylinder (110) of the sub-reactor (100) of the highest level, the titanium dioxide waste acid source is connected with the inlet that is in reaction cylinder (110) of the sub-reactor (100) of the lowest level through titanium dioxide waste acid pump.
7. The gas-liquid reactor for increasing titanium dioxide waste acid concentration according to claim 1, 2, 3, 4, 5 or 6, wherein: and a liquid feeding valve (220) is arranged on the connection between the liquid feeding pump (210) and the liquid inlet of the reaction cylinder (110).
8. The gas-liquid reactor for increasing titanium dioxide waste acid concentration according to claim 7, wherein: a liquid outlet valve (320) is arranged on the connection between the liquid outlet pump (310) and the liquid inlet of the qualified product storage tank (300).
9. The gas-liquid reactor for increasing titanium dioxide waste acid concentration according to claim 8, wherein: an acid concentration on-line detector (121) is arranged in the waste acid storage tank (120) of the sub-reactor (100) at the highest level.
10. The gas-liquid reactor for increasing titanium dioxide spent acid concentration of claim 9, wherein: the device also comprises a controller which is respectively electrically connected with the acid concentration on-line detector (121), the liquid feeding pump (210), the liquid feeding valve (220), the liquid outlet pump (310) and the liquid outlet valve (320); when the acid concentration on-line detector (121) detects that the concentration of titanium white waste acid in the waste acid storage tank (120) reaches a set range, a signal is fed back to the controller, the controller firstly controls the liquid outlet valve (320) to be opened, controls the liquid outlet pump (310) to pump the titanium white waste acid in the highest-level sub-reactor (100) to the qualified product storage tank (300), then controls the liquid outlet valve (320) to be closed, controls the liquid delivery valve (220) to be opened, and simultaneously controls the liquid delivery pump (210) to pump the titanium white in the next-level sub-reactor (100) to the previous-level waste acid sub-reactor (100).
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Application publication date: 20191231 |
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