KR100569535B1 - Solution capturing and circulating type powder drying machine using cyclone - Google Patents

Abstract

The present invention collects the organic and inorganic powder contained in the waste solution generated by the wet chemical process in a very fine state within a very short time and at the same time recover the waste solution without discharging to the outside to prevent environmental pollution by using a cyclone It relates to a recovery type circulation powder drying apparatus.

The present invention is a waste container for storing the waste solution, an air compressor for compressing air, a spray gun for mixing and spraying the waste solution of the waste solution and the compressed air generated in the air compressor, and the spray gun is installed at the bottom A bell-shaped drying chamber, a burner installed upwardly in the lower part of the drying chamber to heat the injected waste solution, and a first blower installed at the lower position of the burner in the drying chamber to blow the waste solution upward, and continuous installation with the drying chamber. The waste solution gas, powder, and compressed air from the drying chamber are flowed in, and the powder is recovered through centrifugation, and the separated waste solution gas and compressed air are transferred to the next stage, and a condensate pipe is placed outside the zigzag flow path. A condenser for condensing the conveyed waste solution gas, which is continuously installed with a cyclone having an installed shape, and Wastewater solution passed to recovery, will be composed of the one component pass through the air condenser with a gas ejector for discharging into the atmosphere.

Description

Solution capturing and circulating type powder drying machine using cyclone}

1 is a block diagram of a powder drying apparatus according to the present invention.

Figure 2 is an external configuration of the powder drying apparatus according to the present invention.

Figure 3 is an experimental value graph using the powder drying apparatus according to the present invention.

*** Explanation of symbols for the main parts of the drawing ***

1 waste solution container 2 air compressor 3 spray gun

4: drying chamber 5: burner 6: first blower

7: cyclone 7a: powder reservoir 8: condenser

8a: flow path 8b: condensate pipe 9: waste solution recovery container

10 gas discharge machine 11 second blower 12 control panel

13 case 14 powder recovery port 15 waste solution inlet

16: waste solution recovery port 17: burner fuel input door

The present invention relates to a solution recovery type cyclic powder drying apparatus using a cyclone, and collects organic and inorganic powders contained in the waste solution generated through a wet chemical process in a very fine state within a short time, and at the same time the external waste solution It is to prevent environmental pollution by collecting without discharging.

As is well known, the waste solution that is inseparably generated during the wet chemical process contains more than 20% by weight of organic and inorganic powders, so that these powders are dried, collected and reused. To this end, a spray dryer is conventionally used. This spray dryer is a device that sprays waste solution in hot air to evaporate the solution components and to dry the powder to be collected through the dust collecting filter.

However, when the spray dryer is used, the exhaust gas generated after drying is treated as it is or once in the air, and when the spray dryer is used in the food manufacturing process, the exhaust gas is not particularly harmful to the environment. The waste solution generated through the chemical process contains various types of environmentally harmful organic solvents and various catalyst components, and when the spray dryer is applied, the exhaust gas that is dried and evaporated is harmless to the environment. Processing costs were high because they had to be discharged to the atmosphere, which in some cases accounted for more than 30% of the cost of production.

In addition, since most of the dust collecting filters used in the spray dryer are focused on collecting and drying the powder of several micrometers or more, the particle size of the powder produced through this is inevitably increased, and there is a limit in that it is impossible to produce high quality ultra fine powder. Although the mesh size of the dust collecting filter can be configured to be able to produce powders of 100 nm or less, in this case, the air passage of the dust collecting filter is blocked by fine powder, which requires frequent replacement and thus the production efficiency decreases, and the use of expensive filters increases. There is.

Therefore, when the organic and inorganic powder having a size of 100 nm or less is manufactured by the wet chemical process, the work is usually performed in batch units, which causes a chemical reaction and dries the solution to collect the powder. This unit is applied to the output of one unit, and a new unit goes through this process again, and this method also has a limitation in powder production, and there is no difference in product quality for each unit. And quality control.

The present invention has been proposed in view of this point, and the waste solution generated through the wet chemical process is injected into the bell-shaped drying chamber together with the compressed air, and a burner is installed at the lower portion of the drying chamber so that the fire is directly applied to the waste solution. In the lower part of the drying chamber, a blower is installed to prevent the waste solution from sinking to the lower part. The cyclone is continuously provided with the discharge part of the drying room so that the powder is collected in the powder recovery container at the lower part by centrifugation of the cyclone. Is discharged to the upper part, and the condenser equipped with a condensate pipe is installed outside the cyclone and the flow path of the gas is zigzag, and the condensed waste solution is collected in the waste solution collecting container at the lower part. The air component is configured to be recycled to the drying chamber through a blower to collect high precision organic and inorganic powders as well as waste solution. It is to provide a solution recovery type cyclic powder drying apparatus using a cyclone that is harmless to the environment because the gas does not leak to the outside.

Hereinafter, the present invention will be described in detail with reference to the embodiments and the accompanying drawings.

Solution recovery type circulation powder drying apparatus using a cyclone according to the present invention is a device for recovering the powder contained therein by drying the waste solution generated through a wet chemical process, as shown in Figure 1 and 2, A spray for mixing and spraying a waste solution container (1) for storing waste solution, an air compressor (2) for compressing air, and a waste solution of the waste solution container (1) and compressed air generated from the air compressor (2). A bell-shaped drying chamber 4 in which the gun 3, the spray gun 3 is installed in the lower portion, a burner 5 which is installed upward in the lower portion of the drying chamber 4 and heats the injected waste solution, and a drying chamber. The first blower (6) installed at the lower position of the burner (4) to blow the waste solution upwards, and the waste solution gas, powder, and compressed air discharged from the drying chamber (4) continuously installed with the drying chamber (4). The powder is recovered by centrifugation and the separated waste solution gas and compressed air The condenser for condensing the waste solution gas to be transported to the next step and the condensate pipe 8b is installed on the outside of the zigzag flow path (8a) is continuously installed with the cyclone (7) (8), a waste solution recovery container (9) for recovering the waste solution condensed from the condenser (8), and a gas discharger (10) for discharging the air component passing through the condenser (8) to the atmosphere. In addition to (8), a second blower 11 for recycling the air component to the drying chamber 4 is further provided.

In addition, the blowing speed of the first blower 6 and the second blower 11, the number of uses of the burner (5), the feed rate of the fuel flowing into the burner (5), the compressed air injected from the air compressor (2) The control panel 12 is provided to adjust the injection pressure, the nozzle size of the spray gun 3, etc. to an optimum condition according to the type or condition of the waste solution, and although not shown, the control panel 12 is provided with a microcomputer. All processes can be done automatically, and microcomputers can be managed remotely by connecting to production sites, central control rooms, etc.

In the drawing, reference numeral 7a denotes a powder reservoir for collecting powder, 13 denotes a case forming the appearance of the apparatus, 14 denotes a powder recovery port, 15 denotes a waste solution inlet for injecting waste solution, and 16 denotes condensation. The waste solution recovery port for collecting the used waste solution is shown, and 17 represents a burner fuel input door for injecting burner fuel.

Referring to the operation of the solution recovery type circulation powder drying apparatus using a cyclone according to the present invention configured as described above are as follows.

First, the waste solution generated in the wet chemical process is injected into the waste solution container (1) through the waste solution inlet (15), and then compressed air generated from the waste solution and the air compressor (2) through the spray gun (3). To the bell-shaped drying chamber (4) in the upward direction, the burner (5) and the first blower (6) is installed in the lower portion of the drying chamber (4) by the burner (5) It can be dried in a short time while being burned, and can be raised without falling down by the first blower 6.

This method is completely different from the conventional spray dryer which injects the waste solution downward and injects hot air into the spray chamber, and heats the waste solution directly through the burner 5 so that the hot air is heated. It is not compared with the method of the spray dryer which injects into the drying time and the degree of drying. Furthermore, since the waste solution is sprayed upward, the waste solution may be subject to the force to fall under the action of gravity. It is possible to dry quickly.

At this time, the structure of the drying chamber (4) takes the form of a bell (bell), which is to reduce the speed of the initially injected waste solution to stay in the drying chamber (4) for as long as possible to increase the drying efficiency once The dried gas, air, and powder are allowed to escape at a high speed so that they can be efficiently collected while passing through the cyclone 7.

The mixed air of the powder, air and waste solution gas exiting the drying chamber (4) flows into the cyclone (7), and through the centrifugal action, the powder is collected in the lower powder reservoir (7a), the waste solution gas and air It is passed through the upper part of the cyclone (7) and is transferred to the next step. Since the particle diameter of the powder dissolved in the waste solution is usually about several tens of nm to about 100 nm, the powder collected in the powder storage container (7a) is a little as the waste solution gas evaporates. Even if they are aggregated, they may be finely separated in the course of passing through the cyclone (7) to have a particle diameter of 100 nm or less, so that high-precision powders can be collected without using a separate filter, thereby reducing the cost of filter replacement. In addition to saving, it is possible to recover the powder in a continuous process without stopping the operation can greatly increase the amount of powder recovery per unit time.

After the powder has been recovered, the remaining exhaust gas, that is, waste solution gas and air, flows into the condenser 8 and passes through a zigzag flow passage 8a, and heat-exchanges with water in the condensate pipe 8b installed outside to condense into a liquid phase. The condensed waste solution is collected and collected in the waste solution collection container 9, and the recovery amount is more than 90% of the first injected waste solution gas, so that most of the waste solution is substantially except compressed air. In this way, if most of the waste solution is recovered, the harmful components of the human body are hardly distributed in the discharged air, and the recovered waste solution can be safely discharged after being treated by methods such as neutralization and wastewater treatment.

The air discharged from the condenser 8 is discharged to the atmosphere through the gas discharger 10, and since there is almost no waste solution contained in the air, there is no environmental problem.

However, in the present invention, not all of the air components that are not condensed are discharged to the atmosphere, and some of them are recycled to the drying chamber 4 according to the blowing of the second blower 11, so that the amount of harmful components that may be included in the air components. It is possible to further reduce the cause of air pollution, and the air component introduced into the drying chamber 4 can float the mixture of the waste solution, air, and powder injected into the drying chamber 4 so as not to fall and dry. It can improve performance further.

On the other hand, depending on the type or condition of the waste solution, the optimum carrier gas, that is, the moving speed of the compressed air for transferring the waste solution, the number of operation of the burner 5, the temperature of the drying chamber 4, the amount of the waste solution sprayed, etc. It is necessary to adjust the state, for this purpose is provided with a control panel 12 on the outside of the case (13).

At this time, the movement speed of the carrier gas is necessary to control the drying efficiency, and moving the carrier gas quickly may improve the powder collection performance in the cyclone (7), but too fast movement reduces the residence time of the powder in the drying chamber. Since it gives a disadvantage that can reduce the drying efficiency.

The temperature control of the drying chamber 4 can be controlled by controlling the number of operation of the burner 5 or the supply speed of the fuel.If too much fuel is supplied, there is a risk of powder contamination due to incomplete combustion. In order to establish, the function which can adjust temperature and the number of burners 5 appropriately is needed.

It is possible to adjust the amount of the sprayed solution by adjusting the injection pressure of the compressed air, and by adjusting the nozzle diameter of the spray gun 3, adjusting the mixing ratio of the solution and air, adjusting the spraying speed, Both adjustments and the like become possible.

That is, the operation of each device can be set through the control panel 12 according to the type and state of the waste solution generated through the wet chemical process, and automatically operated by the microcomputer provided in the control panel 12 according to the setting. The whole device can be made in a continuous process, and the characteristics of the powder during the operation of the device can be grasped in real time, so that the necessary device can be adjusted to the optimum state, enabling efficient production management.

In addition, since the microcomputer provided in the control panel 12 automatically manages the operation of the device, the drying device can be automatically operated. When the microcomputer is connected to a production site, a central control room, or the like, the operation state and process of the drying device can be operated at a long distance. Monitoring of variables becomes possible.

In the following, to capture the actual powder by applying the present invention will be described as an example.

Example 1

The powder contained therein was collected using a waste solution in the form of a suspension in which a powder and a solution of water, ethanol and ammonia were mixed, wherein the particle size of the powder was about 30 nm to 100 nm, and the waste solution was used. The mixing ratio of the heavy powder was about 20% by weight.

In order to compare the drying performance, the weight of the dry powder per hour according to the present invention and the weight of the dry powder during drying of the conventional batch method was compared, the results are shown in Table 1 below.

TABLE 1

system Batching method (㎏ / h) Invention (kg / h) Maximum dry performance 0.5 5 Optimal Drying Performance 0.2 3

As summarized in Table 1, it can be seen that the drying efficiency of the two methods shows a remarkable difference. In the case of the batch method, the drying apparatus according to the present invention can be obtained by drying up to 500 g of powder per hour. It was possible to dry up to 5kg of powder per hour, and in addition to the maximum drying performance, the conventional batch method dries 200g of powder per hour, while the drying apparatus according to the present invention enables drying of 3kg of powder per hour. Could confirm.

Here, the maximum drying performance means the maximum drying capacity that can be dried per hour regardless of the powder collecting performance, the optimum drying performance is the maximum drying performance that can be obtained without lowering the powder collecting performance of the present invention The optimum operating performance of the drying device will be 3kg / h.

3 is a graph showing the recovery rate of powder and solution under the above conditions.

The recovery rate of the powder refers to the ratio of the powder actually collected to the amount of powder injected. In the case of the batch method, the total amount of the injected powder can be recovered unless the solution is actually lost. As a result of measuring the powder collection performance by comparing the amount of powder obtained by the drying apparatus according to the present invention, the collection performance was slightly different depending on the drying capacity per hour, but the optimum drying performance of drying the powder of 3 kg per hour The collection performance is 98, which is almost no difference compared to the case of drying in a batch method.

This means that even when the powder is collected by using the cyclone (7), the recovery rate can be very high and made effective. Thus, when using the cyclone (7), there is no need for a separate filter, which has significant advantages. Self-explanatory

In addition, the solution recovery rate is also very important from an environmental point of view, showing the ratio of the solution recovered through the condenser when the amount of the initially added solution is 100.

The waste solution used in this experiment is water, ethanol, ammonia water, and the solution contains ethanol which has considerable volatility. Therefore, the information obtained through the experiment of the present invention may be equally applicable to many volatile solutions.

As shown in FIG. 3, even when the drying capacity is up to 5 kg, it can be seen that the ratio of the recovered solution is maintained at about 95. The alcohol component in the volatilized solution at high temperature meets a high temperature flame and partially burns. Most of the remaining unburned alcohol was reduced back to the liquid alcohol in the condenser. In fact, the alcohol concentration in the gas was measured using an alcohol sensor at the gas outlet, and the value remained almost zero. Therefore, it can be seen that even in the case of volatile alcohol, it does not mix in the exhaust gas at all.

In addition, no ammonia odor could be detected near the gas outlet during the performance evaluation, which condensed and recovered all environmentally harmful components in the exhaust gas, and only the remaining air components were discharged into the atmosphere to prevent air pollution. It means that there is.

As described above, the present invention is the waste solution and the compressed air is injected upward in the bell-shaped drying chamber, the lower portion is provided with a burner and a blower can directly heat dry the sprayed waste solution and fall to the bottom Since it is not suspended, the drying performance is greatly improved, and after it exits the drying chamber, it immediately flows into a cyclone and is separated into powder and waste gas by centrifugation, so that organic and inorganic powders of fine particles can be recovered in a short time without a separate filter. In addition, all the processes can be carried out continuously without shutting down to increase the powder recovery per unit time.

In addition, the waste solution containing powder can be recovered mostly in the order of spraying, evaporation, and condensation, instead of being discharged to the atmosphere in the form of waste gas, thereby fundamentally preventing air pollution, and all devices can be controlled through the control panel. There is a very useful effect that the operation of the device is easy, and the management is easy.

Claims (3)

In the device for drying the waste solution generated by the wet chemical process to recover the powder contained therein, A waste solution container (1) for storing waste solution, an air compressor (2) for compressing air, and a mixture of waste solution of the waste solution container (1) and compressed air generated by the air compressor (2) are sprayed. A spray gun 3 to be installed, a bell-shaped drying chamber 4 in which the spray gun 3 is installed at a lower portion thereof, and a burner 5 which is installed upward in a lower portion of the drying chamber 4 to heat the injected waste solution. ), A first blower (6) installed at the lower position of the burner of the drying chamber (4) to blow the waste solution upwards, and the waste solution from the drying chamber (4) continuously installed with the drying chamber (4). The cyclone (7) for receiving the gas, powder, and compressed air to recover the powder through centrifugation, and separating the separated waste gas and the compressed air to the next stage, and the condensate pipe outside the zigzag flow path (8a) 8b) having a shape in which it is installed and continuously installed with the cyclone 7 for the conveyed waste A condenser (8) for condensing gas, a waste solution collection vessel (9) for recovering the waste solution condensed from the condenser (8), and a gas discharger for discharging the air component passing through the condenser (8) to the atmosphere ( Solution recovery type circulation powder drying apparatus using a cyclone, characterized in that consisting of 10). The method of claim 1, Solution recovery type circulation type powder drying apparatus using a cyclone, characterized in that the second blower (11) for recirculating the air component to the drying chamber (4) is installed in the condenser (8). delete

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