WO2012118242A1 - Apparatus and method for re-treating a solid propellant for a propulsion system - Google Patents

Abstract

The present invention relates to an apparatus and method for retreating a solid propellant for a propulsion system, which can enable the recovery of resources using the difference in solubility of the main components (inorganic salts, polymer materials, metals, and the like) of the solid propellant within the propulsion system without using a separate solvent, such as an interfacial active agent or water, and without incinerating the solid propellant. To this end, the apparatus for retreating the solid propellant includes: a propellant extraction part for extracting the solid propellant from the propulsion system in the shape of a chip; a micro-pulverization part receiving a propellant mixture in which the chip-shaped solid propellant and cooling water used for extracting the solid propellant are mixed together from the propellant extraction part to pulverize the propellant contained in the propellant mixture into particles having a size of about 1 μm or less while maintaining a preset temperature; a solid-liquid separation part receiving the propellant mixture containing the propellant pulverized into particles from the micro-pulverization part so as to separate the solids in which the polymers and metals are mixed from the propellant mixture, thereby separating a liquid inorganic-salt solution; a concentrating part receiving the inorganic-salt solution from the solid-liquid separation part so as to remove a predetermined amount of water contained in the inorganic-salt solution, thereby increasing the concentration of the inorganic-salt solution; and a drying part receiving the inorganic-salt solution from the concentrating part so as to dry the inorganic-salt solution, thereby obtaining crystalline inorganic-salt powder.

Description

Reprocessing device and reprocessing method of solid propellant for propulsion engine

The present invention relates to a reprocessing apparatus and a reprocessing method of a solid propellant for a propulsion engine to be reprocessed and recycled from a solid propellant extracted from a propulsion engine such as a rocket or a shell.

In general, rockets are classified into a propulsion engine, a warhead, and a fuse, wherein the propulsion engine is composed of a mixed solid propellant composed of various compounds in an aluminum combustion tube.

In this case, the solid propellant refers to a drug made by mixing an oxidant with a fuel as a solid propellant and showing a propelling effect by burning an oxidant without the aid of oxygen.

When the rocket propulsion engine is aged, it is processed through its own disposal process. During the disposal process, the solid propellant charged in the propulsion engine is extracted through an extraction process and then processed through incineration, or through a reprocessing process. Recycled.

Here, the reprocessing process is a process of separating and recovering ammonium perchlorate (NH 4 ClO 4), which is used as an oxidant of the solid propellant, from the extract of the solid propellant and treating it for reuse.

In US Patent No. 4198209 (hereinafter referred to as “Prior Art 1”), the above reprocessing process separates the waste solid propellant from the propulsion engine and grinds it to 1/8 inch thickness, which is 65-82 ° C. While propellant was granulated to 0.15 cm or less while heating and stirring at a high temperature of about 30 minutes, the inorganic salt was dissolved, and the solid and the liquid were separated. Then, by cooling the separated liquid, the oxidant crystals were leached and separated and recovered. It suggests that it can be reprocessed.

However, the above-described prior art 1 is not only enormous in power consumption and time consuming since the stirring and pulverization of the solid propellant in a high temperature environment, but also in a substantially high temperature environment causes the solid propellant to form a large mass with stronger adhesion. Since the dissolution of the oxidant is prevented by causing the phenomenon, the stirring and grinding time is inevitably longer, and there is a problem in that the addition of the surfactant is necessary.

In addition, the above-described prior art 1 is added to the surfactant to prevent the solid propellant from sticking together in the granulation process by heating and stirring the solid propellant, the process due to the addition of the surfactant and recovery of the surfactant Not only this troublesome problem is caused but also the purity of the oxidant recovered due to the addition of the surfactant is likely to be lowered.

In addition, U.S. Patent No. 4854982 (hereinafter referred to as "Prior Art 2") shows that the above reprocessing process makes gaseous ammonia into a liquid phase at high pressure to pulverize the solid propellant using a multijet. At the same time, the oxidant is dissolved and filtered, the liquid portion is separated, and then the high pressure held therein is released to make ammonia into a gaseous state and separated from the solid oxidant, thereby recovering only the solid oxidant.

However, the above-described prior art 2 has a problem in that high pressure maintenance equipment is required for maintaining the liquid phase of ammonia from the pulverization of the solid propellant to the dissolution process, which causes high cost and difficulty in maintenance.

In addition, the ammonia is an expensive solvent, and there is a problem that some emissions occur during the recovery process, causing air pollution.

The present invention does not incinerate the solid propellant, and it is possible to recover the resources using the difference in the solubility of the main components (inorganic salts, polymers, metals) of the solid propellant in the propulsion engine without a solvent or a solvent other than water. The present invention provides a reprocessing apparatus and a reprocessing method of a solid propellant for a propulsion engine of the type.

According to an apparatus for reprocessing a solid propellant for a propulsion engine of the present invention, a propellant extracting unit extracts a solid propellant from a propulsion engine in the form of a chip; The propellant extracting unit is provided with a propellant mixture solution containing a solid propellant in the form of a chip and a coolant used in the extraction process of the solid propellant, and maintaining a set temperature while grinding the propellant contained in the propellant mixture into fine particles of 1 μm or less. Grinding unit; A solid-liquid separator which receives a propellant mixture liquid pulverized into the fine particles from the micro-pulverizer and separates a solid mixture of polymer and metal from the propellant mixture liquid to separate a liquid inorganic salt solution; A concentrating part receiving the inorganic salt solution from the solid-liquid separation part and increasing a concentration by removing a predetermined amount of water contained in the inorganic salt solution; And, receiving the inorganic salt solution from the concentrated portion, and drying the inorganic salt solution provided to obtain the inorganic salt powder in a crystalline state, characterized in that it comprises a.

Herein, the micro-pulverizer disperser blade which firstly grinds a hopper for receiving and storing a propellant mixture solution from the propellant extracting unit and a propellant mixture solution in the hopper, and simultaneously grinds a solid propellant in a chip form in the propellant mixture solution. and a micronizer for receiving a propellant mixture liquid subjected to the primary grinding process by the pretreatment grinder and grinding the particles into fine particles of 1 µm or less.

In addition, the solid-liquid separator is characterized by consisting of a drum screen (drum screen).

The concentrating part may include a decompression chamber configured to form a decompression space while the inorganic salt solution is stored, a heating module installed to surround the outer wall surface of the decompression chamber and providing hot heat, and rotatably provided in the decompression chamber. While being characterized in that it comprises a stirring blade for continuously stirring the inorganic salt solution, and a drive motor for driving the stirring blade.

The drying unit may further include a drying chamber sealed from an external space, an atomizer spraying the inorganic salt solution provided from the concentrating unit into the drying chamber, an electric heater generating dry hot air and providing the drying hot air into the drying chamber; And a collecting tank for collecting the inorganic salt powder dried by the drying hot air, wherein the drying unit includes a steam discharge pipe through which water vapor is discharged from the drying chamber and a pipe of the steam discharge pipe. Characterized in that it further comprises a bag filter (bag filter) for collecting a small amount of inorganic salt powder from the water discharged through the steam discharge pipe.

In addition, between the solid-liquid separator and the condensation unit is provided with an inorganic salt solution from which the solid component is removed from the solid-liquid separator to remove finely remaining solid components therefrom to increase the purity of the inorganic salt. Characterized in that the filter unit is further included, the fine filtration unit is configured to filter the solid impurities of 1㎛ or more size.

The preheating unit may further include a preheating unit receiving the concentrated inorganic salt solution from the concentration unit and preheating the condensing unit and the drying unit. It is characterized by consisting of a heat-exchanger (heat-exchanger) to provide heat to increase the temperature of the inorganic salt solution.

And, according to the reprocessing method of the solid propellant for the propulsion engine of the present invention propellant extraction step of extracting the solid propellant from the propellant in the form of a chip; The propellant contained in the propellant mixture solution is provided as a fine particle of 1 μm or less while being provided with a propellant mixture solution containing a solid propellant in the form of chips extracted through the propellant extraction step and a coolant used in the extraction process of the solid propellant and maintaining a set temperature. Propellant grinding step of grinding; A solid-liquid separation step of separating a solid mixed with a polymer and a metal from the propellant mixture liquid pulverized into fine particles through the propellant crushing step to separate a liquid solution of an inorganic salt; A concentration step of increasing the concentration by removing a certain amount of water from the inorganic salt solution separated through the solid-liquid separation step; In addition, the drying step is provided by receiving the concentrated inorganic salt solution through the concentration step to obtain an inorganic salt powder in a crystalline state: characterized in that it comprises a progress.

Here, the propellant pulverization step is a pre-treatment pulverization process of first grinding the solid propellant in the form of chips in the propellant mixture through a pretreatment grinder, and pulverizing the primary pulverized solid propellant into fine particles of 1㎛ or less through a micronizer It characterized in that the progress including the atomization process.

In addition, between the solid-liquid separation step and the concentration step is provided with an inorganic salt solution from which the solid component has been removed from the solid-liquid separation unit, and removes the solid component having a size of 1 µm or more remaining finely therefrom. It is characterized in that the microfiltration further comprises a step for increasing the purity.

In addition, the preheating step of preheating the inorganic salt solution is further included between the concentration step and the drying step.

In addition, the drying step includes the step of spraying the inorganic salt solution in a concentrated state, and the process of producing a mineral salt powder in a crystalline state by supplying and drying a high temperature dry hot air to the sprayed inorganic salt solution. It features.

The reprocessing device and reprocessing method of the solid propellant for the propulsion engine of the present invention is not a method of incineration of the solid propellant of the propulsion engine or by adding a separate chemical additive, so that the solubility of the main component of the solid propellant through the supply of water is determined. It is possible to obtain a more pure inorganic salt because it is a method of recovering through recrystallization after separating between each material by using.

That is, the solid propellant is granulated together with the cooling water to dissolve the inorganic salt which is the only water soluble component of the solid propellant in water, and thereafter, the solid and the liquid are separated from each other, and only the liquid inorganic salt solution is crystallized into the inorganic salt. By recovering, a high purity inorganic salt can be obtained.

In addition, since the reprocessing device and reprocessing method of the solid propellant for the propulsion engine of the present invention uses water, it is possible to prevent the risk of fire with the generation of pollutants, thereby enabling the recycling of environmentally friendly and safe resources. Has an effect.

1 is a process chart showing to explain the reprocessing apparatus of a solid propellant for a propulsion engine according to a preferred embodiment of the present invention.

2 is a block diagram showing the micro-crushing unit of the reprocessing apparatus of the solid propellant for the propulsion engine according to an embodiment of the present invention.

Figure 3 is a block diagram showing a solid-liquid separation unit in the reprocessing apparatus of the solid propellant for the propulsion engine according to a preferred embodiment of the present invention

Figure 4 is a block diagram showing the concentration of the reprocessing apparatus of the solid propellant for the propulsion engine according to a preferred embodiment of the present invention

Figure 5 is a block diagram showing a drying unit of the reprocessing apparatus of the solid propellant for the propulsion engine according to a preferred embodiment of the present invention

Hereinafter, a preferred embodiment of a reprocessing apparatus and a reprocessing method of a solid propellant for a propulsion engine of the present invention will be described with reference to FIGS. 1 to 5.

Attached Figure 1 shows a reprocessing apparatus (hereinafter referred to as "reprocessing device") of the solid propellant for the propulsion engine according to an embodiment of the present invention, as can be seen through this reprocessing according to an embodiment of the present invention The apparatus is largely comprised of a propellant extraction unit 100, a micro grinding unit 200, a solid-liquid separator 300, a concentrator 400 and a drying unit 500.

The reprocessing apparatus according to the embodiment of the present invention described above will be described in more detail for each component as follows.

First, the propellant extracting unit 100 is a series of components for extracting a solid propellant from the propelling engine. In the embodiment of the present invention, the propellant extracting unit 100 is a milling machine.

That is, the propellant extracting unit 100 is configured to extract and extract the solid propellant filled in the propulsion engine with a millig tool (not shown), wherein the extracted solid propellant is a post-process It is desirable to form a chip suitable for performing the grinding process.

In addition, during the extraction of the solid propellant by the propellant extracting unit 100, a coolant having a temperature of about 0 to 10 ° C. is provided to prevent the risk of explosion due to spark generation and frictional heat and to reduce the adhesive force of the solid propellant. It is configured, such cooling water is provided through the water supply unit 800 which will be described again below.

Next, the micro-crusher 200 is a series of components for receiving a chip-shaped solid propellant extracted through the propellant extraction unit 100 to finely grind them while maintaining a set temperature. In this case, the set temperature is a temperature at which the inorganic salt can be dissolved even though the temperature is lower than room temperature. In the embodiment of the present invention, the set temperature is 5 to 15 ° C.

The micro-pulverization unit 200 is configured to receive a mixture of the propellant extractor 100 and the coolant used in the extraction process of the solid propellant (hereinafter, referred to as “propellant mixture”).

In particular, in the embodiment of the present invention, as shown in FIG. 2 to which the micro-pulverization unit 200 is attached, it is composed of a double-pulverization structure including a pre-treatment mill 210 and a micronizer 220. present. This is for the purpose of more smoothly grinding the fine propellant in the propellant mixture through the pretreatment mill 210 to fine particles of 1 μm or less by the micronizer 220.

Here, the pretreatment grinder 210 agitates the hopper 211 for receiving and storing the propellant mixture solution from the propellant extraction unit 100 and the propellant mixture solution in the hopper 211 and at the same time in the form of a chip in the propellant mixture solution. And a disperser blade 212 that primarily crushes the solid propellant.

At this time, the disperser blade 212 is rotated by the driving force of the disperser motor 214 by the disperser shaft 213 to give flow to the propellant mixture liquid to form a turbulent flow by propellant It is configured to remove the stagnation time for the solid propellant in the mixed solution so as not to stick to each other, thereby enabling a smooth atomization operation. The disperser motor 214 is provided on the upper surface of the hopper 211. In addition, the hopper 211 is connected to the mixed solution inlet pipe 215 and the mixed solution outlet pipe 216, respectively.

In addition, the micronizer 220 includes a micronizer motor 221, a rotor 222, and a stator 223 as a conventional ultra fine grinding machine, and includes the pretreatment grinder. While serving to grind the propellant mixture solution is made of the primary grinding operation provided by 210 again to serve to grind the solid propellant into fine particles of 1㎛ or less.

In particular, the rotor 222 and the stator 223 constituting the micronizer 220 is a low-friction coefficient of a magnetic material (67% nickel, 16% chromium, other silicon, boron, copper, molybdenum, iron, carbon) In addition to the coating with) the other micronizer 220 inside the Teflon coating is preferably to be affected to the least impact on the adhesion of the polymer.

Next, the solid-liquid separator 300 is provided with a propellant mixture liquid which is pulverized into fine particles from the micro-pulverizing unit 200, and separates the solid mixture of polymer and metal from the propellant mixture liquid to form a liquid inorganic salt (Inorganic) salt) (hereafter referred to as "inorganic salt solution") is a series of configurations to separate.

In the exemplary embodiment of the present invention, as shown in FIG. 3 to which the solid-liquid separator 300 is attached, the storage tank 310 in which the propellant mixture is stored, and the upper space in the storage tank 310 are rotatable. It is installed in the mesh structure, the screen drum (320) and the screen drum (320) through which the propellant mixture solution provided from the micro-crushing unit 200 passes, and provided along the inner circumferential surface of the screen drum (320) And a drum screen including a drum wedge 330 for moving the propellant mixture according to the rotation of the 320 and a water supply pipe 340 for spraying water into the screen drum 320. To present.

At this time, the mesh formed by the screen drum 320 is configured to be formed to 0.15 mm or less so that a solid of 0.15 mm or more can be filtered out.

Next, the concentrator 400 is provided with the inorganic salt solution from the solid-liquid separator 300 and is a series of components for increasing the concentration by removing a certain amount of water contained in the inorganic salt solution.

As shown in FIG. 4, the concentrator 400 is installed at a high pressure while being wrapped around the outer wall surface of the decompression chamber 410 and the decompression chamber 410 to form a decompression space while the inorganic salt solution is stored. Heating module 420 to provide the heat of, a stirring blade 430 rotatably provided in the decompression chamber 410 and continuously stirring the inorganic salt solution, and a drive motor for driving the stirring blade 430 And 440.

In this case, the heating module 420 is configured as a structure of a hot water jacket in which a high-temperature fluid flows to receive the high-temperature fluid and conducts heat of the fluid to the decompression chamber 410, but the heating as necessary The module can also be configured as a conventional electric heater.

Next, the drying unit 500 is provided with an inorganic salt solution from the concentrating unit 400, and the inorganic salt solution is dried in a high temperature state to obtain a series of inorganic salt crystals.

As shown in FIG. 5, the drying unit 500 sprays the drying chamber 510 sealed from the external space and the inorganic salt solution provided from the concentrating unit 400 into the drying chamber 510. Disc type atomizer (520), an electric heater (530) for generating a dry hot air into the drying chamber 510, and an inorganic salt in powder form dried by the dry hot air ( Hereinafter, the "inorganic salt powder" is configured to include a collecting container 540 is collected.

At this time, the drying unit 500 is provided on the steam discharge pipe 550 for discharging the water vapor in the drying chamber 510 and the water discharged through the steam discharge pipe 550 while being provided on the pipeline of the steam discharge pipe 550. A bag filter 560 for collecting a small amount of inorganic salt powder is further included.

Of course, the cyclone dust collector 570 that can filter the fine inorganic salt powder from the steam by using the cyclone method as shown in the accompanying FIG. It may be.

On the other hand, the embodiment of the present invention suggests that the micro-filtration unit 600 is further included between the solid-liquid separation unit 300 and the concentration unit 400.

The fine filtration unit 600 is provided with an inorganic salt solution from which the solid component is removed from the solid-liquid separator 300 to remove the solid component remaining finely therefrom, thereby improving the purity of the inorganic salt. It is structure to raise.

At this time, the fine filtration unit 600 is proposed to be composed of a 1㎛ line filter (filter) to filter the solid impurities of 1㎛ or more size.

In addition, the embodiment of the present invention suggests that the preheating unit 700 is further included between the concentrating unit 400 and the drying unit 500.

The preheating unit 700 is a series of configurations in which the inorganic salt solution, which has been concentrated in the concentrating unit 400, is preheated before being provided to the drying unit 500. It consists of a heat-exchanger that provides heat and raises the temperature of the inorganic salt solution.

Of course, the preheater 700 as described above may be further provided between the solid-liquid separator 300 and the concentrator 400, the fine filtration unit 600 is the concentrator 400 ) And the drying unit 500 may be further provided, as shown in FIG. 1.

In addition, the embodiment of the present invention suggests that the water supply unit 800 is further included.

At this time, the water supply unit 800 serves to provide the cooling water used for the extraction of the solid propellant by the propellant extraction unit 100, and provides the water used for the preheating operation of the preheater 700. In addition, it is configured to further perform the role of providing water to the water supply pipe 340 of the solid-liquid separator 300.

In the following, the reprocessing method of the solid propellant using the reprocessing apparatus of the present invention having the above described series will be described in more detail based on the reprocessing process.

First, the waste propulsion engine to be recycled is provided to the propellant extracting unit 100, and the solid propellant filled in the waste propulsion engine is extracted from the propellant extracting unit 100.

At this time, the solid propellant is mixed with a polymer binder, an oxidant which is a kind of metal fuel and an inorganic salt. The double binder is tacky as an amorphous polymer that is not fully crosslinked, and this property remains the same in the solid propellant mixture.

Therefore, during the extraction of the solid propellant by the propellant extracting part 100, the cooling water (cooling water of 0 to 10 ° C.) is provided through the water supply part 800 to lower the adhesiveness, thereby preventing the interruption of the cutting operation. To be able.

Particularly, in the extraction of the solid propellant by the propellant extracting part 100 as described above, the milling tool extracts the solid propellant into a chip shape having a size of about 2 to 3 mm, and the solid propellant extracted in the form of chips. The cooling water used during the extraction of the solid propellant is returned to the micro grinding unit 200 in a mixed state with each other.

Next, the micro-crusher 200 finely grinds the propellant mixture solution (a mixture of the coolant used for extracting the solid propellant in the form of a chip and the solid propellant) provided from the propellant extraction unit 100.

At this time, the propellant mixture is first pulverized through the pretreatment grinder 210 constituting the micro pulverizer 200 and then pulverized again through the micronizer 220 to be pulverized into fine particles of 1 μm or less. .

That is, the propellant mixture solution is provided into the hopper 211 constituting the pretreatment grinder 210, and then the primary grinding is performed on the solid propellant in the propellant mixture solution by driving the disperser blade 212. The propellant mixture liquid in which the grinding operation is performed is provided to the micronizer 220 so that the solid propellant in the propellant mixture liquid is pulverized into fine particles of 1 μm or less by the micronizer 220.

Here, since the adhesion is strong due to the material properties of the solid propellant during the first grinding of the propellant mixture by the pretreatment grinder 210, if the stagnation time occurs, the micronizer 220, which is a subsequent process, by the adhesiveness described above The efficiency of the work can be reduced. However, turbulence is formed by the rotation of the disperser blade 212 constituting the pretreatment grinder 210, and the subsequent process by removing the stagnation time for the solid propellant through the turbulence of the propellant mixture solution to prevent them from sticking to each other. The atomization work by the micronizer 220 can be made smoothly.

In particular, in the embodiment of the present invention, when the atomizing operation of the propellant mixture by the micro-pulverization unit 200 described above, the propellant mixture is not heated as in the conventional art, while maintaining the temperature between 5 ° C and 15 ° C. It suggests performing the work.

This is because dissolution of inorganic chloride in general water is an endothermic reaction, so that it can increase the solubility of inorganic salts when heated, but in the case of solid propellants for propulsion engines, the inorganic salts are released while the temperature increases. This is because the inorganic salt dissolution rate is lowered, and the dissolution efficiency is also lowered. In particular, the dissolution rate of the inorganic salt is drastically reduced when the temperature is 5 ° C. or lower, and the adhesion of the solid propellant is high when the temperature is 15 ° C. or higher. The present invention suggests that the propellant mixture is performed while maintaining the temperature between 5 ° C. and 15 ° C. because the inorganic salts are prevented from coming out.

Although the method of maintaining the propellant mixture at a set temperature may be various, in the embodiment of the present invention, the propellant mixture is maintained at the set temperature by adjusting the amount of cooling water provided during the extraction process of the propellant by the propellant extractor. Suggest that possible. That is, a sufficient amount of cooling water is supplied so that the temperature of the propellant mixture can be maintained at the set temperature.

At this time, the sufficient amount is preferably determined in consideration of the solubility curve of the inorganic salt. That is, when the temperature of the propellant mixture is too low (eg 5 ° C. or less), the inorganic salts may not be smoothly dissolved, and the amount of the inorganic salts and the cooling water of 0 to 10 ° C. may be sufficient to dissolve the propellant extraction unit. It is preferable to determine the supply amount of the cooling water in consideration of the temperature which is increased by heat exchange as the temperature of the working part is reduced while extracting the solid propellant at 100.

Then, when the grinding operation of the solid propellant into fine particles is completed through the above-described process, the propellant mixture is provided to the solid-liquid separator 300.

In this case, the solid-liquid separator 300 separates the solid and liquid inorganic salt (Inorganic slat) solution mixed with the polymer and the metal from the provided propellant mixture.

This means that the inorganic salt solution passes through the screen drum 320 to the bottom space in the storage tank 310 while the propellant mixture passes through the screen drum 320 constituting the solid-liquid separator 300. The solid component which is dropped and mixed with the polymer and the metal is discharged to the outside of the storage tank 310 by being guided by the drum wedge 330 according to the rotation of the screen drum 320.

In addition, water is supplied through the water supply pipe 340 by the operation of the water supply unit 800 while the above process is performed, so that the solid component and the inorganic salt solution can be separated more smoothly.

Next, the inorganic salt solution flowed to the bottom space in the storage tank 310 of the solid-liquid separator 300 is provided to the micro filtration unit 600, wherein the micro filtration unit 600 is 1㎛ or more Considering that it is a line filter configured to filter solid impurities of a size, the solid component remaining finely in the inorganic salt solution is further filtered out while the inorganic salt solution passes through the microfiltration unit 600. This results in a higher purity of the inorganic salt solution.

In this case, when the solid component filtered through the solid-liquid separator 300 is mostly a polymer binder, it may be recycled to, for example, rubber.

Next, the inorganic salt solution is provided into the decompression chamber 410 constituting the concentrating unit 400 to proceed with its concentration process.

The concentration process is a process for controlling the particle size during crystallization by increasing the concentration of the solution, and considering that the size of the crystals to be dried in the drying process, which is a post-process depends on the concentration of the inorganic salt from the above-described inorganic salt solution It removes a certain amount of water to increase the concentration.

This concentration process is carried out by evaporating a certain amount of the water in the inorganic salt solution through the high temperature heat supply and continuous stirring of the inorganic salt solution provided into the decompression chamber 410.

At this time, the internal space of the decompression chamber 410 to reduce the boiling point for the inorganic salt solution by performing a decompression, the hot air is heated module 420 surrounding the outer wall surface of the decompression chamber 410 Provided via heat conducted from, the continuous stirring is performed through the rotation of the stirring blade 430 through the drive of the drive motor 440.

In addition, in the above-described concentration process, water evaporated from the inorganic salt solution is generated in the form of steam, which is discharged outside the decompression chamber 410 and then returned to the water supply unit 800 through the condensation.

On the other hand, when the concentration is completed to reach the set concentration of the inorganic salt solution through the above-described concentration process, the concentrated inorganic salt solution passes through the preheating unit 700 and after the preheating is completed drying unit 500 Is provided.

In this case, the drying unit 500 is operated to obtain an inorganic salt powder in a crystalline state by drying the inorganic salt solution provided from the concentration unit 400 in a high temperature state.

The crystallization process may be various, but in the embodiment of the present invention, the above-described crystallization process simultaneously sprays the inorganic salt solution into the upper space in the drying chamber 510 through a disc atomizer 520. By providing the drying hot air generated through the heater 530 to the upper space in the drying chamber 510, the inorganic salt in the drop state is dried in the upper space in the drying chamber 510 by the drying hot air, and then the drying The powder is dropped to the bottom of the drying chamber 510 by gravity and accumulated in the drying chamber 510.

At this time, the moisture evaporated from the inorganic salt in the drop state by the drying hot air is discharged to the outside of the drying chamber 510 through the steam discharge pipe 550 with the dry air in the vapor state, during the steam discharge pipe 550 The bag filter 560 provided on the conduit is collected so that a small amount of inorganic salt powder discharged together with the dry air and water vapor is not discharged to the outside.

As a result, the solid propellant filled in the waste propulsion engine through the series of processes described above is in a state in which the inorganic salt powder in the crystalline state can be recovered and reused.

Claims (15)

1. Propellant extraction unit for extracting a solid propellant from the propellant in the form of a chip;

   The propellant extracting unit is provided with a propellant mixture solution containing a solid propellant in the form of a chip and a coolant used in the extraction process of the solid propellant, and maintaining a set temperature while grinding the propellant contained in the propellant mixture into fine particles of 1 μm or less. Grinding unit;

   A solid-liquid separator for receiving a propellant mixed solution pulverized into the fine particles from the micro-pulverizing unit, and separating a solid mixed with a polymer and a metal from the propellant mixed solution to separate a liquid inorganic salt solution;

   A concentrating part receiving the inorganic salt solution from the solid-liquid separation part and increasing a concentration by removing a predetermined amount of water contained in the inorganic salt solution; And,

   Receiving an inorganic salt solution from the concentration unit, the drying unit for drying the provided inorganic salt solution to obtain the inorganic salt powder in a crystalline state: a solid propellant reprocessing apparatus comprising a.
2. The method of claim 1,

   The micro grinding unit

   A pretreatment grinder having a hopper for receiving and storing a propellant mixture from the propellant extraction unit and a disperser blade for firstly grinding a solid propellant in the form of chips in the propellant mixture while stirring the propellant mixture in the hopper. Wow,

   And a micronizer for receiving a propellant mixture solution subjected to a primary grinding process by the pretreatment mill to pulverize the particles into particles of 1 μm or less.
3. The method of claim 1,

   The solid-liquid separator

   Apparatus for reprocessing a solid propellant for a propulsion engine, characterized in that it comprises a drum screen.
4. The method of claim 1,

   The concentrate part

   A decompression chamber configured to form a decompression space while the inorganic salt solution is stored;

   A heating module installed to surround the outer wall of the decompression chamber and providing high temperature heat;

   A stirring blade rotatably provided in the decompression chamber and continuously stirring the inorganic salt solution;

   Reproducing apparatus for a solid propellant for a propulsion engine, characterized in that it comprises a drive motor for driving the stirring blades.
5. The method of claim 1,

   The drying unit

   A drying chamber sealed from the outer space,

   An atomizer for spraying the inorganic salt solution provided from the concentrating unit into the drying chamber;

   An electric heater generating dry hot air and providing it into the drying chamber;

   Recycling apparatus for a solid propellant for a propulsion engine, characterized in that it comprises a collecting tank for collecting the inorganic salt powder dried by the drying hot air.
6. The method of claim 5,

   The drying section

   A steam discharge pipe through which water vapor in the drying chamber is discharged;

   And a bag filter provided on the conduit of the steam discharge pipe to collect a small amount of inorganic salt powder from the water discharged through the steam discharge pipe, wherein the bag filter further comprises a bag filter.
7. The method of claim 1,

   Between the solid-liquid separator and the concentrator

   The solid propellant for propelling engines, further comprising a microfiltration unit for receiving an inorganic salt solution from which the solid component has been removed from the solid-liquid separation unit to remove finely remaining solid components therefrom to increase the purity of the inorganic salt. Reprocessing device.
8. The method of claim 7, wherein

   The fine filtration unit is a reprocessing apparatus for a solid propellant for a propulsion engine, characterized in that configured to filter the solid impurities of 1㎛ or more size.
9. The method of claim 1,

   Between the concentrating part and the drying part

   Re-treatment apparatus for a solid propellant for a propulsion engine, characterized in that the pre-heating unit for receiving the inorganic salt solution of the concentrated state from the concentrated section further comprises.
10. The method of claim 9,

    The preheating unit

    And a heat-exchanger configured to increase the temperature of the inorganic salt solution by providing a high temperature heat to the pipeline through which the inorganic salt solution passes.
11. Propellant extraction step of extracting the solid propellant from the propellant in the form of a chip;

    The propellant contained in the propellant mixture solution is provided as a fine particle of 1 μm or less while being provided with a propellant mixture solution containing a solid propellant in the form of chips extracted through the propellant extraction step and a coolant used in the extraction process of the solid propellant and maintaining a set temperature. Propellant grinding step of grinding;

    A solid-liquid separation step of separating a solid mixed with a polymer and a metal from the propellant mixture liquid pulverized into fine particles through the propellant crushing step to separate an inorganic slat solution in a liquid state;

    A concentration step of increasing the concentration by removing a certain amount of water from the inorganic salt solution separated through the solid-liquid separation step; And,

    Receiving the inorganic salt solution in a concentrated state through the concentration step of drying to obtain a inorganic salt powder in a crystalline state: drying step of reprocessing the solid propellant for a propulsion engine, characterized in that the progress.
12. The method of claim 11,

    The propellant grinding step

    A pretreatment pulverization process for first grinding the solid propellant in the form of chips in the propellant mixture through a pretreatment grinder,

    Reprocessing of the solid propellant for the propulsion engine comprising a micronization process for grinding the first pulverized solid propellant through a micronizer into fine particles of 1㎛ or less.
13. The method of claim 11,

    Between the solid-liquid separation step and the concentration step

    It is characterized in that it further comprises a fine filtration step to increase the purity of the inorganic salt by receiving the inorganic salt solution from which the solid component is removed from the solid-liquid separator and finely removing the solid component having a size of 1 µm or more. Reprocessing method of solid propellant for propulsion engines.
14. The method according to claim 11 or 13,

    Between the concentration step and the drying step

    Re-treatment method of a solid propellant for a propulsion engine further comprising a preheating step of preheating the concentrated inorganic salt solution through the concentration step.
15. The method of claim 11,

    The drying step

    Spraying the inorganic salt solution in a concentrated state,

    And a process of generating inorganic salt powder in a crystalline state by supplying and drying a high temperature dry hot air to the sprayed inorganic salt solution.

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