JPH0574634U - Spray pyrolysis device with pressure vent - Google Patents

Abstract

(57) [Summary] [Structure] A spray pyrolysis apparatus 1 comprising a reaction chamber 2, a heating furnace 3 surrounding the outside of the reaction chamber 2, and a sprayer 4 arranged above the reaction chamber 2. A spray pyrolysis apparatus with a pressure diffusion port, in which the pressure diffusion port 5 is provided in the reaction chamber 2. [Effect] When the gas generated by the reaction with the introduced gas undergoes rapid thermal expansion and the reaction chamber becomes positive pressure, flammable solvents such as methanol and ethanol are added to the stock solution to be thermally decomposed, and the carrier gas is used as a carrier gas. If the O ₂ gas is used and the risk becomes high, or if there is an abnormal reaction, an operation error, or the stock solution accidentally leaks and accumulates in the reaction chamber, the pressure inside the reaction chamber becomes abnormal. Even when it is predicted that the pressure will rise and cause an explosion, it is possible to prevent the pressure inside the reaction chamber from rising abnormally and prevent the occurrence of abnormal circumstances.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a spray pyrolysis apparatus with a pressure outlet.

[0002]

[Prior Art]

 Finer properties of fine ceramics can be obtained only by controlling the purity, chemical composition and fine structure of the raw materials. The manufacturing process, especially the method of synthesizing raw materials, often holds the key to product development. It is common for all raw material powders to have a high degree of purity, high compositional uniformity in the case of compounds and mixtures, and fineness and high reaction activity. Although various synthesis methods have been devised to obtain ceramic powders having such properties, as a synthesis method for satisfying the requirements for fineness, high purity, and high composition uniformity, synthesis via a gas phase or a liquid phase is performed. There is a law. Unlike the conventional case where a solid phase is used, it is considered that each constituent element is mixed in atomic order in the synthesis method via the liquid phase. The liquid phase method is a method of precipitating metal elements present in a solvent into hydroxides, nitrates, sulfates, carbonates, etc., and thermally decomposing them to synthesize oxide fine powders. Many liquid phase methods have been developed due to differences in the method of precipitating a metal salt and the method of thermal decomposition, and the spray thermal decomposition method is one of them.

In the spray pyrolysis method, a metal salt solution is sprayed as fine droplets in an atmosphere maintained at a temperature higher than the temperature at which pyrolysis occurs, and the solvent is vaporized and the metal salt is precipitated in an extremely short time. It is a method of synthesizing oxide (non-oxide is also possible) fine powder by performing the thermal decomposition. The powder produced by this method has the advantages of compositional uniformity on an atomic scale and uniform dispersibility of trace constituent elements, and fine particles with good dispersibility can be obtained. Even if there is compositional non-uniformity due to drying or thermal decomposition, it is physically limited within the divided fine particles, so that composition separation due to rearrangement of components is small. Also, the proportion of the components contained in the individual sprayed solutions is very close to that of the conditioned solution, so that the dispersion of the components can be tightly controlled.

As described above, in the spray pyrolysis method, a metal salt solution as a raw material for fine ceramics or oxide superconducting material is atomized into a pyrolysis device at a high temperature of, for example, 500 to 1300 ° C. to form an extremely short time. It is a method of producing fine powder by performing thermal decomposition / reaction or synthesis in time.

[0005]

[Problems to be solved by the device]

 However, such conventional spray pyrolysis method is still in a laboratory stage, and specific heating conditions of the reaction chamber, detailed strength design of the reaction chamber, control of spray thermal decomposition conditions, etc. At present, the data necessary for the industrialization of is not yet clarified or clarified. Since spray pyrolysis in the reaction chamber is usually carried out in a high temperature atmosphere of 500 to 1300 ° C as described above, it may vary depending on operating conditions, but if adverse conditions such as the use of a large amount of solvent overlap, the reaction chamber inside the reaction chamber There is a risk of abnormal pressure rise.

The present invention solves the above-mentioned conventional problems and provides a pressure vent in the upper part of the reaction chamber to avoid the risk of abnormal pressure rise in the reaction chamber which may occur depending on operating conditions. Then, it aims at ensuring the safe operation of the spray pyrolyzer.

[0007]

[Means for Solving the Problems]

 The object of the present invention is to provide a spray pyrolysis apparatus comprising a reaction chamber and an atomizer arranged above the reaction chamber according to the present invention, wherein the reaction chamber is provided with a pressure release port. Can be achieved by a spray pyrolysis device. In addition, in the spray pyrolysis apparatus of the present invention, it is generally preferable to provide a heating furnace surrounding the outside of the reaction chamber, but in addition, when hot hot air is blown into the reaction chamber for thermal decomposition, or a solution and gas It is not necessary to provide a heating furnace when, for example, reacts to generate reaction heat. Further, the pressure vent port is provided in the reaction chamber, but its position is not particularly limited, and it can be provided in the upper part, side face part or lower part of the reaction chamber.

[0008]

[Action]

 Since the reaction inside the reaction chamber of the spray pyrolysis apparatus is carried out in an atmosphere of 500 to 1300 ° C., the inventor of the present invention suddenly thermally expands the introduced gas and the gas generated by the reaction, and the reaction chamber has a positive pressure. I confirmed that there is something. A flammable solvent such as methanol or ethanol is added to the stock solution to be thermally decomposed, or O is added to the carrier gas. ₂ Since gas is used, the risk is high. Therefore, it is expected that the pressure in the reaction chamber will rise abnormally and lead to an explosion at the time of abnormal reaction, at the time of operation error, or when the stock solution is accidentally leaked and accumulated in the reaction chamber. Even if the pressure in the reaction chamber rises abnormally, it is possible to prevent the occurrence of the abnormal situation by providing the reaction chamber with a pressure outlet for releasing the pressure. The release pressure of the pressure outlet, that is, the value at which the pressure in the reaction chamber (inside the system) is released, is appropriately determined depending on the conditions such as the type of stock solution and the heating temperature. System pressure) 0.1-1.0 kg / cm²When it reaches the temperature, it is formed so as to automatically release the gas to the outside of the system.

[0009]

【Example】

 Next, embodiments of the present invention will be described in more detail with reference to the drawings, but the present invention is not limited to these embodiments. FIG. 1 is a schematic cross-sectional view showing an example of a spray pyrolysis apparatus with a pressure outlet according to the present invention. In FIG. 1, the spray pyrolysis apparatus 1 comprises a reaction chamber 2, a furnace 3 surrounding the outside of the reaction chamber 2, and a sprayer 4 arranged above the reaction chamber 2. Further, a pressure dissipation port 5 is provided in the upper part of the reaction chamber 2. The stock solution 6 is atomized into the reaction chamber 2 by the atomizing air 7 via the atomizer 4. The sprayed stock solution 6 is instantly solidified in the reaction chamber 2 and is entrained by the carrier gas (air) 8 toward the powder outlet 9 in the lower part of the reaction chamber.

FIG. 2 and FIG. 3 are explanatory views showing an example in which the pressure diffusion port 5 is provided in the ceiling portion of the reaction chamber 2, and a lid 21 that can be opened and closed via a hinge 22 near the sprayer mounting seat 23. This is an example of mounting. In this example, the reaction chamber is hermetically closed by the gravity of the lid 21.

FIG. 4 and FIG. 5 are explanatory views showing another example in which the pressure diffusion port 5 is similarly provided in the ceiling portion of the reaction chamber 2. In this example, the lid 41 is merely placed on the pressure diffusion port 5, and is connected to the ceiling of the reaction chamber 2 by a chain 42 in order to prevent scattering during pressure diffusion.

FIG. 6 is an explanatory view showing an example in which the pressure diffusion port 5 is provided on the side surface portion of the reaction chamber 2. In this example, a lid 61 is attached to the side surface of the reaction chamber 2 via a hinge 62 so as to be openable and closable, and a waveguide 63 is provided surrounding the pressure dissipation port 5. In this case, the pressurized gas ejected from the pressure diffusion port 5 through the lid 61 is guided to a position apart from the pyrolysis device by a predetermined distance via the waveguide 63, so that the danger is further avoided.

[0013]

[Effect of the device]

As described above, according to the spray pyrolysis apparatus with pressure vent of the present invention, when the gas generated by the reaction with the introduced gas undergoes rapid thermal expansion and the reaction chamber becomes positive pressure, the thermal decomposition is Inflammable solvents such as methanol and ethanol are added to the stock solution, or O ₂ gas is used as the carrier gas, which increases the risk, or during abnormal reactions, when operating mistakes occur, or Even if the stock solution is mistakenly leaked and accumulated in the reaction chamber and the pressure inside the reaction chamber rises abnormally, and it is predicted that an explosion will occur, by providing a pressure release port to release the pressure, the reaction chamber This has the effect of suppressing an abnormal increase in the pressure of the vehicle and preventing an abnormal situation from occurring.

[Brief description of drawings]

FIG. 1 is a schematic cross-sectional view showing an example of a spray pyrolysis apparatus with a pressure outlet according to the present invention.

FIG. 2 is a plan view showing an example in which a pressure outlet is provided in a ceiling portion of a reaction chamber.

FIG. 3 is a cross-sectional view showing an example in which a pressure diffusion port is provided in a ceiling portion of a reaction chamber.

FIG. 4 is a plan view showing another example in which a pressure outlet is provided on the ceiling of the reaction chamber.

FIG. 5 is a cross-sectional view showing another example in which a pressure outlet is provided on the ceiling of the reaction chamber.

FIG. 6 is an explanatory diagram showing an example in which a pressure outlet is provided on a side surface portion of a reaction chamber.

[Explanation of symbols]

 1 Spray Pyrolysis Device with Pressure Dispersion Port 2 Reaction Chamber 3 Heating Furnace 4 Atomizer 5 Pressure Dispersion Port 6 Undiluted Liquid 7 Air for Atomization 8 Carrier Gas (Air) 9 Powder Outlet 21, 41, 61 Lid, 22, 62 Hinge, 42 chains 63 waveguide

Continuation of front page (51) Int.Cl. ⁵ Identification number Reference number within the agency FI technical display location // C01B 13/34 ZAA 8516-4G (72) Creator Takashi Ito 3847 Ikebe-cho, Midori-ku, Yokohama-shi, Kanagawa Prefecture Koki Co., Ltd.

Claims (2)

[Scope of utility model registration request] 1. A spray pyrolysis apparatus comprising a reaction chamber and an atomizer arranged above the reaction chamber, wherein the reaction chamber is provided with a pressure diffusion port. 2. The spray pyrolysis apparatus according to claim 1, further comprising a heating furnace surrounding the outside of the reaction chamber.