RU271U1 - Vapor burner - Google Patents

Abstract

Evaporative burner containing a diffusion chamber, at the outlet of which the evaporator is coaxially located, and at the inlet there is a device for supplying evaporated fuel, connected by a fuel line to the evaporator, characterized in that the evaporator is circular, and the distance from the outlet cut of the diffusion chamber to the surface of the evaporator facing it equal to 1/5 - 1/6 of the inner diameter of the evaporator, and the ratio of the diameter of the outlet slice of the diffusion chamber to the inner diameter of the evaporator is 1: 1.5.

Description

The technical field to which the utility model belongs.

This utility model relates to the field of energy, namely to burners operating on evaporated liquid fuel.

The utility model with the greatest success can be applied in industrial furnaces designed for the remelting of secondary aluminum and its alloys or other metals with a melting point below 750 C.

The utility model may also find application in boiler furnaces and other heating installations.

BACKGROUND

A typical representative of evaporative burners is a torch device protected by ASSSSR N 302489, MKI F 23D 5/04, 1968.

The burner device includes outer and inner casings, in the last of which a heat pipe is installed, made in the form of a truncated cone with an inlet diffuser, to which a fuel steam pipe is connected, connected to the upper cavity of the inner casing, which serves as a fuel tank. At the same time, holes for supplying air and exhausting combustion products are made on the surface of the outer casing.

This burner has a narrow purpose and is intended only for heating an internal combustion engine. It

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HP makes it possible to ensure high torch temperatures and, therefore, cannot be used for high-temperature heating, which is necessary, for example, for melting and heating metal in metallurgical furnaces or, for example, for firing bricks. In this burner, it is not possible to adjust the shape of the torch, and an open flame reduces safety precautions and worsens environmental conditions. Known Burner for burning liquid fuel, protected and.with.SSSR N 577352, MKI F23D 5/04, 1975 The burner contains an annular evaporation cavity, a coaxially located combustion chamber with an air supply pipe and fuel nozzles connected to the evaporation cavity, and an ignition tray located at the periphery. In this case, the evaporation cavity is installed in the pan with the upper part at 0.4 - 0.6 of its height, and the lower part in the combustion chamber, and the nozzles are made on the inner walls of the evaporation cavity. This burner is characterized by the complexity of the design, it can only be used in an upright position, cannot work without compressed air (autonomously). Due to the use of compressed air, the torch temperature is not high enough for remelting, for example, secondary aluminum. The temperature of the compressed air is lower than the ambient temperature due to its liquefaction. As a result of the supply of compressed air on the cold walls of the burner, condensate will appear which, evaporating, emits oxygen and hydrogen vapors. Hydrogen vapors are actively absorbed by aluminum during its remelting, and this is harmful - cross in the melt. Excess air oxygen in the furnace will additionally oxidize aluminum.,

Yaleya Burner, protected by A.S. USSR N 330305, MKI FC3D 5/04, 1970. - prototype.

The burner contains a mixer with an evaporator at the outlet and a collector located at the inlet for supplying evaporated fuel. At the same time, a flare chamber is provided at the outlet of the mixer, located in a housing configured for longitudinal movement.

The burner is also distinguished by the complexity of the design. The air-gas mixture flow is directed along the axial line of the burner. The confuser shape of the torch chamber narrows the torch, making it aimed at a limited area of the heat-receiving surface. This does not allow the use of this burner for melting, for example, secondary aluminum, since a torch directed to a certain point would burn aluminum scrap, but would not melt it. In addition, the burner does not provide a sufficiently intense evaporation of fuel (heat loss from heating the housing and the outlet section as a whole). Consequently, the density of the torch and its thermal characteristics are not large enough for use,

for example, in the remelting of aluminum and its alloys, the melting temperature of which does not exceed 750 C.

The use of an open spiral-shaped evaporator in burners for remelting aluminum would lead to uneven evaporation of fuel from different turns of the evaporator, and would also reduce the reliability of the structure due to the possible burning of the coil facing the diffusion chamber.

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ESSENCE OF A USEFUL MODEL

The task to which the claimed utility model is directed is to create a burner of a simpler design, but which would allow:

a) increase the rate of evaporation of fuel;

b) receive a good quality spray;

c) regulate the geometric and thermal characteristics of the torch.

To do this, the evaporation burner contains a diffusion chamber, at the outlet of which the evaporator is coaxially located, and at the inlet there is a device for supplying evaporated fuel, connected by a fuel line to the evaporator.

The difference from the prototype, according to the utility model, is that the evaporator is circular, and the distance from the outlet slice of the diffusion chamber to the surface of the evaporator facing it is 1/5 - 1/6 of the inner diameter of the evaporator, and the ratio of the diameter of the exit slice of the diffusion chamber to the inner diameter of the evaporator is 1: 1.5.

LIST OF DRAWINGS FIGURES

Subsequently, the present utility model is illustrated by a detailed description of a specific example of its implementation with reference to the accompanying drawing, which shows a longitudinal section: an evaporation burner.

INFORMATION CONFIRMING THE POSSIBILITY OF IMPLEMENTING A USEFUL MODEM The vaporization burner contains a diffusion chamber 1, at the outlet of which an annular evaporator 2 is located coaxially with it, and at the inlet there is a device for supplying evaporated fuel made in the form of a cylindrical nozzle 3. Fuel line 4 connects the evaporator 2 and nozzles 3 which is mounted on the fuel line 4 by means of a thread and installed with the possibility of axial movement in the range of 20-35 mm The nozzles 3 form an annular gap 6 in the diffusion chamber 1. The evaporator 2 is connected by a pipe 5 to a fuel supply tank (not shown in FIG.). The distance from the exit slice of the diffusion chamber to the evaporator surface facing it is equal to 1/5 of the inner diameter of the annular evaporator 2. The ratio of the diameter of the exit slice of the diffusion chamber to the inner diameter of the evaporator is 1: 1.5. The vaporization burner operates as follows: 44 Liquid fuel from the tank (not shown in FIG.) Enters the evaporator 2, where it is heated to a vapor state. The fuel vapor through the fuel line 4 enters and leaves the nozzle 3, ejecting part of the air necessary for combustion (primary air) from the environment through the annular gap 6, forming a vapor-air mixture. Under the influence of this air in the diffusion chamber 1 there is a more intense combustion of the fuel, the torch is longer, and the temperature of the torch is much higher.

changes in the living cross section of the annular gap b by moving the nozzle 3.

In this case, the flow of the vapor-air mixture, moving towards the exit cut of the diffusion chamber 1, is intensively turbulized, which allows for a wide torch at the outlet of the diffusion chamber 1, which heats the evaporator 2 tangentially, releasing the heat necessary to turn liquid fuel into a vapor state.

It was experimentally established that the best evaporation rate of liquid fuel is achieved by installing the surface of the evaporator 2 at a distance from the outlet slice of the diffusion chamber equal to 1/5 - 1/6 of the inner diameter of the evaporator when the ratio of the diameter of the exit slice of the diffusion chamber 1 to the inner diameter of the evaporator is 1: 1 ,5.

For the complete combustion of the vapor-air mixture, secondary air is used, which is contained in the cavity of the furnace or other heating installation in which an evaporative burner is installed.

President of CJSC Russian-American company ACRA

.Zotin

Claims (1)

Evaporative burner containing a diffusion chamber, at the outlet of which the evaporator is coaxially located, and at the inlet there is a device for supplying evaporated fuel, connected by a fuel line to the evaporator, characterized in that the evaporator is circular, and the distance from the outlet cut of the diffusion chamber to the surface of the evaporator facing it equal to 1/5 - 1/6 of the inner diameter of the evaporator, and the ratio of the diameter of the outlet slice of the diffusion chamber to the inner diameter of the evaporator is 1: 1.5.