SU63093A1 - Catalytic oven - Google Patents

Description

Known catalytic heaters, mainly for aircraft engines, have a number of drawbacks, the main reason for which is their lack of thermal conductivity, the scarcity of the used contact mass (usually, asbestos) and so on. The purpose of the furnace is a catalyst in the form of asbestos-fiber coated with oxides of some metals; it is deposited on a hollow tribrach, which is placed with an annular gap between the inner casing (tube) and the outer casing that protects the furnace from external influence. of air. The inner casing, the surface of which is supplied with fuel from the inside, is heat-conducting. The outer heat insulating jacket has a shiny surface on the inside to increase the reflecting effect and improve the working conditions of the catalyst.

The schematic drawing shows a longitudinal section of a catalytic furnace.

In the proposed catalytic furnace, there are three (vertical surfaces covering each other: outer casing 1, catalytic surface (catcher, deposited on the tribrach) 2 and the inner pipe - casing 3. The catalytic surface is carried out by placing the catalytic mass in the space between the iron-ml grids treger (for greater rigidity of the structure, three grids are used.) The space between the catalytic surface and the inner pipe 3 is filled with fuel vapors; in the space between the casing 1 and the catalytic The air surface and the inside of the casing 3 move under the action of natural air. The oxygen from the air and the fuel vapor diffuse towards each other in the catalytic mass and the reaction takes place. It maintains the catalyst in the hot state. Radiation from the inner surface of the catalyst is internalized a casing which, in turn, heats up the air moving inside the casing and is heated by the HI CBioio. Radiation from the outer surface of the catalyst is reflected by the shiny inner surface of the casing 1 back to Hai Kata izator. The air passing over the outer surface of the catalyst is heated over the top of the catalyst, and also partially, inside the casing 1, and more effectively mixed with the hot air coming out of the inner pipe 3. This way: m gets a stream of heated air, which can be directed to the heated object. To reduce heat from the side, the COZHUZH 1 is double-walled or covered with thermal insulation.

Thus, the air is heated not only by the catalyst surface, but also by the surfaces of the inner pipe 3 and the casing 1. Due to this, the heat content of the air is expelled, which can be directed into the hatch of the heater and used for heating.

The cylindrical or conical shape of the catalytic surface gives the POSSIBILITY to obtain a large surface with a small furnace size.

In the proposed furnace, fuel (gasoline) is placed in reservoir 4 with an injection air pump 5. Gasoline is supplied through a pipe and through a series of apertures it is sprayed on the surface of the internal pipe 3, where it is evaporated, unlike those used in previous gasoline supply structures. using a wick. The device described makes it easy to regulate the flow of gasoline by changing the pressure in the tank.

To actuate the furnace

(ignition) serves as a burner 6 of a primus type, placed inside the pipe 3 and connected with the reservoir 4. During ignition, a certain amount of gasoline is fed through the pipe to the internal pipe. Gasoline drains and soaks into the wick, the bottom: the bottom of the hole. Then, by means of the crane switch the supply of gasoline to the burner for the time of heating the inner tube. Further, under the action of radiation from the inner tube, free burning of gasoline evaporated from the wick begins on the catalyst. After that, the supply of gasoline; The burner is stopped and the bvigine feed is switched on through the tube to the inner tube.

With this ignition method, there is no external flame. The intensity of the furnace can be significantly increased; by connecting to the bottom of the extension pipe to increase traction.

Subject invention

Claims (3)

1. Catalytic furnace, mainly for heating aviation engines, characterized in that the catalyst is deposited on a cylindrical or truncated cone with a hollow treger, located with an annular gap between the inner and outer casings, of which the outer one is heat-insulated, and the inner one is heat-treated shim. 2. The form of the furnace pop. 1. characterized in that the inner surface of the outer casing-a is made shiny, in order to increase the reflecting effect. 3. Catalytic furnace according to claims. 1 and 2, characterized in that an annular perforated tube is used to supply fuel, through which fuel is supplied to the surface of the inner casing.