SU1093883A1 - Recirculation furnace - Google Patents

Abstract

A RECIRCULATION OVEN, containing a working chamber, burners with fuel supply pipe, a smoke outlet channel, a recuperator, an air supply channel, a mixing chamber of recirculation with air, and a device that is different in that in order to reduce specific fuel consumption and improve heating quality metal, it is equipped with an additional mixing chamber located between the thrusting device and the mixing chamber recirculating with air and connected to the fuel supply pipe.

Description

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The invention relates to metallurgy and can be used in recirculation furnaces for heating and heat treating a metal.

A device for a recirculating furnace is known, which contains a working space, burners, a heat exchanger, and an injection device, supply and exhaust ducts for flue gases and air 1.

The disadvantages of this design are the high energy consumption for the organization of the circulation of gases and the increased fuel consumption associated with the presence of excess air in the recirculation.

Also known is the design of a recirculating furnace, comprising a working chamber, a burner, a recuperator, an exhauster, a mixing chamber, and recirculated combustion products with atmospheric air. An exhauster with a mixing chamber at the inlet is connected to the section of the smoke path between the recuperator and the chimney, and at the outlet it is connected to the recuperator on the air side. After mixing with cold atmospheric air and additional heating in the heat exchanger, the flue gases are supplied to the burner 2.

The disadvantages of this design of the recirculation furnace are a decrease in the degree of heat utilization in the heat exchanger due to a decrease in the temperature gradient, which leads to an increase in the temperature of the leaving smoke and heat loss with it, high energy consumption for recirculation due to the large extent of the recirculation circuit and the presence of significant flow resistances in the gas path.

Closest to the invention of the technical essence is a recirculation furnace comprising a working chamber, a burner, a recuperator, a mixing chamber, recirculating combustion products with air, an injector. The injecting medium is the ZZ compressor air.

The disadvantage of an honest furnace is the content of excess air entering the heating system, which leads to an increase in the volume of combustion products removed into the chimney, heat loss with it, a decrease in the fuel utilization rate and an increase in its consumption.

The purpose of the invention is to reduce specific fuel consumption and improve the quality of metal heating.

This goal is achieved by the fact that in a recirculation furnace containing a working chamber, burners with a fuel supply pipe, a smoke exhaust channel, a heat exchanger, a supporting channel, a mixing chamber, air recirculation and a trash device, the furnace is equipped with an additional mixing chamber located between the device and the mixing chamber is recirculated with air and connected to the fuel feed pipe.

The drawing shows a diagram of this furnace.

The device includes a working chamber 1, burners 2, fuel supply channels 3, a heat exchanger 4, an exhauster 5, a mixing chamber 6 for recirculating combustion products with air, an additional chamber 7 for mixing fuel with an air-smoke mixture, a feed supply channel 8 for the combustion products from the working chamber, feed channel 9 is recirculated to the mixing chamber with air, channel 10 for supplying heated air in the heat exchanger to the mixing chamber, channel 11 for supplying the fuel-air mixture to the burner, channel 12 for supplying fuel to the mixing chamber for the fuel from the smoke-air mixture Strongly

The device works as follows.

The spent combustion products from the working chamber enter the smoke side of the heat exchanger through the duct, release heat to the heated air and are removed to the chimney. It is recirculated through the channel and the air heated in the recuperator enters the mixing chamber through the channel, where the formation of the smoke-air mixture takes place. Due to the discharge created by the exhauster, this mixture moves into the mixing chamber, where the fuel flows through the channel. The prepared fuel-air mixture is exhausted from the mixing chamber to the burner through the channel. The burner also goes to the combustion of unmixed with the smoke

3 10938834

a mixture of fuel from the hearth-reduce the length of the torch, thereby

chi fuel. exclude the possibility of contact

Smoke-air mixture supplied to the torch with the metal and melting it. The chamber that mixes it with the fuel has the combustion of the fuel at a pre-temperature below the temperature of the self-5 working volume, which leads to micro-ignition of the fuel. The fuel is charged to the loss due to the underburning is topped into the mixing chamber in the amount of liv.

In order to obtain a composition, in the proposed device it is possible to use a fuel / air mixture with a content that achieves a higher combustible component below the lower 10 recirculation, a decrease in the ignition limit of oxygen in the furnace atmosphere, which

Pre-mixing fuel provides better quality

smoke mixture allows heating of the metal.

Claims (1)

A RECIRCULATING FURNACE containing a working chamber, burners with a fuel supply pipe, a smoke exhaust channel, a recuperator, an air supply channel, a mixing chamber for recirculated air and a draft device, characterized in that, in order to reduce specific fuel consumption and improve the quality of heating the metal, it is equipped with an additional a mixing chamber located between the draft device and the mixing chamber of the recirculated air and connected to the water. with fuel supply pipe Fuel