KR200457166Y1 - A drying apparatus for particles - Google Patents

Abstract

The present invention relates to a powder drying apparatus that can perform drying and pyrolysis of droplets without lengthening a drying furnace at the same time, so that the surface of ceramic or metal powder can be easily coated with an oxide-like material.

Powder drying apparatus according to the present invention comprises a means for spraying the liquid containing the fine particles, and a drying means for drying the sprayed droplets, the drying means is a cylindrical crucible with an open top, the cylindrical of the crucible A heating means arranged to surround the outer circumference, wherein the heating means is separated into a first heating jacket and a second heating jacket, and one end of the first heating jacket and the second heating jacket is rotatable through a hinge means. It is characterized in that it is fixed.

Powder dryer

Description

Powder Drying Equipment {A DRYING APPARATUS FOR PARTICLES}

The present invention relates to an apparatus capable of drying a powder, and more particularly, to a powder drying apparatus for pyrolyzing and coating other materials on a surface of ceramic or metal powder dispersed in a liquid, and easily extracting dried powder. The present invention relates to a powder drying apparatus that is easy to maintain and manage a crucible for drying.

A spray dryer generally refers to an apparatus for removing moisture in a droplet in a short time by spraying a liquid containing a component to be powdered or fine particles dispersed in the liquid in a droplet state and passing it through a high temperature dryer.

Such a spray dryer is a method of making a liquid into a liquid state, a method of making a liquid state using ultrasonic waves, a method of spraying a liquid on a spinning disk at high speed to make a liquid state by a mechanical force, and pressurizing the liquid at a high pressure. To pass the nozzle into a droplet state.

Ultrasonic method can obtain a fine particle of about 1 ~ 5㎛ using a vibrator, but there is a disadvantage that mass production is difficult, centrifugal spray method is a method of spraying the stock solution to the spinning disk rotating at 8000 to 15000rpm as 30 ~ 120㎛ On the other hand, the degree of particles can be obtained, but the spraying form is horizontal, so that the size of the furnace is relatively large.

On the other hand, the method of using the nozzle can be used because it can obtain a variety of particle size distribution of 5 to 500㎛ depending on the type of the nozzle, but because the injection form is vertical direction, the height of the device is high, the nozzle must be installed in the furnace of high temperature Due to the deterioration and clogging phenomenon of the use of a long time there is a lot of inconvenience.

Conventional nozzle-type spray dryers, as shown in FIG. 4, have a high pressure spray gas supply device for making a liquid into a liquid state, a supply device for supplying a liquid, and a nozzle for dropping liquid loaded on the spray gas. And a storage unit for collecting and storing the drying furnace and the dried powder of the droplets sprayed through the nozzle, and an exhaust device for removing evaporated water. On the other hand, the drying furnace consists of a cylindrical crucible having a lower portion of the funnel type and a recovery hole for recovering the dried powder and a heating device surrounding the outer peripheral portion of the crucible.

However, such a conventional nozzle spray dryer may be suitable for drying the droplets up to the dropping point of the vertically formed furnace, but drying the droplets containing fine particles and proceeding to pyrolysis of the dried material. There is a lack of residence time within. Accordingly, it is necessary to perform a separate process using a calcination furnace for pyrolysis. In addition, when the length of the drying furnace is increased in order to increase the residence time enough to pyrolyze, there is a problem in that the operating cost for operating the equipment cost and the drying furnace increases.

The present invention was devised to solve the above-mentioned problems of the prior art, and it is possible to simultaneously perform drying and pyrolysis of droplets without lengthening the drying furnace, thereby coating the surface of ceramic or metal powder with an oxide-like material. It is an object of the present invention to provide an easy to dry powder drying apparatus.

In addition, another object of the present invention is to provide a drying apparatus that is easy to take out dried and pyrolyzed powders and to maintain and manage the crucible constituting the drying furnace.

The present invention as a means for solving the above problems, an apparatus for drying a liquid containing fine particles, comprising means for spraying the liquid containing the fine particles, and drying means for drying the sprayed droplets, The drying means includes a cylindrical crucible having an upper opening and heating means disposed to surround the cylindrical outer circumference of the crucible, wherein the heating means is separated into a first heating jacket and a second heating jacket. One end of the first heating jacket and the second heating jacket provides a powder drying apparatus, wherein the one end of the first heating jacket and the second heating jacket are rotatably fixed.

In the powder drying apparatus, a lid may be disposed on an upper portion of the cylindrical crucible and a heating means may be disposed on a lower portion thereof.

In addition, in the powder drying apparatus, a variety of materials of the crucible may be used, but it is preferable to use Inconel when it is necessary to dry the powder and thermally decompose the substance attached to the surface of the powder.

Further, in the powder drying apparatus, the means for heating the lower part of the crucible is characterized in that the hot plate.

In the powder drying apparatus according to the present invention, since the powder is carried out by the crucible itself without carrying out the dried powder from the lower part, the droplets fall from the upper part to the lower part and the water is evaporated and accumulated in the lower part of the crucible in a dried state. By maintaining for a predetermined time in this stacked state, the components adhered to the surface of the powder can be completely pyrolyzed. Therefore, it is not necessary to lengthen the length of the drying furnace for pyrolysis.

In addition, the powder drying apparatus according to the present invention has a form in which the first heating jacket and the second heating jacket are rotated to open and close, so that the powder dried and thermally decomposed by the method of replacing the crucible disposed therein is replaced. Since carrying out is carried out, maintenance of a crucible becomes very convenient.

In addition, in the case of a heating jacket that is heated to a temperature high enough to cause pyrolysis, damage may easily occur. In the apparatus according to the present invention, not only the heating jacket can be easily replaced, but also the first heating jacket and the second heating. Since the jacket is separated, maintenance costs can be reduced because only the problem part is replaced without having to replace the whole.

The singular forms used to describe the embodiments of the present invention are intended to include the plural forms as well, unless the phrases clearly indicate the opposite. And “comprises” means specific features, domains, integers, steps, actions, elements and / or components, and the presence or addition of other specific features, domains, integers, steps, actions, elements, components and / or groups. It is not excluded.

Hereinafter, a powder drying apparatus according to a preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings, but the present invention is not limited to the following examples. Therefore, it will be apparent to those skilled in the art that the present invention may be variously modified without departing from the technical spirit of the present invention.

As shown in Figures 1 and 2, the powder drying apparatus according to the present invention, the spray device 100 for spraying the liquid containing the fine powder largely, and the drying furnace 200 for drying and pyrolyzing the sprayed droplets Is done.

The spraying apparatus 100 is formed with a first supply port 110 through which a liquid in which powder is dispersed is formed on one side, and a second supply port through which nitrogen gas for spraying the liquid is supplied to the opposite side. 120 is formed, the nozzle is disposed in the center, the nozzle 130 to mix the liquid and nitrogen gas supplied from the first supply port 110 and the second supply port 120 to spray at a high pressure ) Is formed. This spray device is disposed in the center of the upper surface of the drying furnace (200).

The drying furnace 200 includes a crucible 210 and first and second heating jackets 220a and 220b surrounding the outer circumference of the crucible 210 and a cover 230 covering the upper opening of the crucible 210. And the crucible 210 is placed and consists of a hot plate 240 for heating the lower portion of the crucible 210.

The crucible 210 may be a variety of materials depending on the final purity or characteristics and drying temperature of the powder to be dried and pyrolyzed, Inconel was used in the embodiment of the present invention. Inconel is a heat-resistant alloy containing 15% chromium, 6-7% iron, 2.5% titanium, 1% aluminum, manganese, and silicon mainly composed of nickel. Because it does not have oxidation resistance, it is a material suitable for drying droplets and thermal decomposition of dried components. In addition, when a high purity material is required, a crucible of a material such as alumina (Al ₂ O ₃ ) or quartz may be used. Crucible 210 according to an embodiment of the present invention is made of a cylindrical shape with an open top and the bottom is closed, the work is made in a batch (batch) method. The first handle 211 is formed on both sides of the upper end of the crucible 210 is to be easily handled.

The first and second heating jackets 220a and 220b are formed in an arc shape so as to fit the outer circumference of the crucible 210 and the first and second presses are bent so that both ends are bent into a "c" shape. It consists of a plate (221a, 221b), and the first and second heating elements (222a, 222b) accommodated inside the first and second plate (221a, 221b) and fixed by the "c" shaped bend. have. The first and second heating elements 222a and 222b are heated by electrical resistance heat, and those capable of heating up to 600 ° C. were used. In addition, second handles 223a and 223b are formed at outer center portions of the first and second plate members 221a and 221b to easily open and close the first and second heating jackets 220a and 220b. 1 and 2, hinges 224 are formed on one side of opposite ends of the first and second heating jackets 220a and 220b, and fixing means 225 are formed on the other side. The first and second heating jackets 220a and 220b may be opened and closed through the second handles 223a and 223b.

The cover 230 is formed of a circular plate formed to completely seal the upper opening of the crucible 210, the one side is formed with a third handle 231 for opening and closing the cover 230, In the center is formed an insertion hole (not shown) for inserting the nozzle of the spray device 100.

The hot plate 240 is heated by using an electric resistance heat, the capacity of which can be heated up to 600 ℃ was used.

Next, a process of drying the powder dispersed in the dispersion using the powder drying apparatus according to the embodiment of the present invention having the above configuration will be described.

First, the dispersion in which the powder is evenly dispersed is pressurized by the pump and sent to the first supply port 110 of the spraying apparatus 100. Then, the nitrogen gas pressurized from the nitrogen tank is sent to the second supply port 120. The dispersion and the nitrogen gas mixed in the spraying device 100 are sprayed through the nozzle is made of small droplets of several to several tens of micrometers.

As the droplets of the dispersion liquid thus formed fall inside the heating furnace heated to 500 ° C., the moisture contained in the dispersion is evaporated, and only the substances contained in the dispersion precipitate on the surface of the powder and remain fixed.

Since the powder dried as described above falls on the bottom of the crucible 210 and is continuously heated while being accumulated, organic matter in the solidified material on the surface of the powder may be removed through pyrolysis. This eliminates the need for lengthening the drying furnace for pyrolysis.

When the drying and pyrolysis are completed, the worker loosens the fixing means 250 for fixing the first and second heating jackets 220a and 220b and rotates the two heating jackets using the second handles 223a and 223b. Open it.

Then, using the first handle 211 formed in the crucible 210, the crucible 210 is separated from the drying furnace and taken out to the outside, and a new crucible is mounted and used.

In the drying apparatus according to the present invention, since the crucible can be easily mounted or removed by rotating the two separate heating jackets, it becomes easy to handle the dried powder in the crucible. In addition, since the heating jacket is separated, when a problem occurs in a specific part, only the heating jacket needs to be replaced, thereby reducing maintenance costs.

1 is a front view of a powder drying apparatus according to an embodiment of the present invention.

2 is a rear view of the powder drying apparatus according to the embodiment of the present invention.

3 is a partially enlarged perspective view of a powder drying apparatus according to an embodiment of the present invention.

4 is a schematic view of a conventional powder drying apparatus.

Claims (4)

An apparatus for drying a liquid containing fine particles, Means for spraying the liquid containing the fine particles and drying means for drying the sprayed droplets, The drying means includes a cylindrical crucible having an upper opening and heating means disposed to surround the cylindrical outer circumference of the crucible, wherein the heating means is separated into a first heating jacket and a second heating jacket. One end of the first heating jacket and the second heating jacket is rotatably fixed through the hinge means formed in the drying means, and includes fixing means for fixing the first heating jacket and the second heating jacket, When drying is completed, the fixing means 250 for fixing the first and second heating jackets is released, and the first and second heating jackets are rotated and opened, and the crucible can be replaced. Powder drying device. The powder drying apparatus according to claim 1, wherein a cover is disposed on an upper portion of the cylindrical crucible and a heating means is disposed on a lower portion thereof. The powder drying apparatus according to claim 1 or 2, wherein the crucible is made of Inconel. 3. Drying means according to claim 2, wherein the heating means is a hot plate.

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