Radiation-convection heat exchanger spiral type

 

Radiation-convection heat exchanger spiral type is intended primarily for waste heat recovery furnace and the furnace gases (fumes) with a high degree of dust. The heat exchanger contains a cone-shaped housing with connections for supplying heating and heated environments. In the body wall of the housing has a channel L-shaped (angular) cross section in the form of a conical spiral around the inner heat transfer surface of the shell which is formed by the two tape spiral surfaces, forming a parallel respectively to form two adjacent spiral heat transfer surfaces that belong to the specified channel in the housing wall. During its movement through the heat exchanger heating the gaseous environment, interacting with a spiral heat-transfer surfaces, is twisted into the form of a whirlwind, making intensified mass-heat transfer from the middle part of the flow of heating medium to its periphery and intense turbulent washing of the entire heat transfer surface. 2 Il.

The invention relates to heat exchange apparatus, primarily for waste heat recovery furnace and the furnace gases (fumes) with visi case with connections to inlet and outlet of heating and heated environment and placed in it the coil is in the form of a cylindrical helix of round tubes (B. P. Tebenkov. Heat exchangers for industrial furnaces. M.: metallurgy, 1975, page 142, Fig. 75).

The disadvantage of this known heat exchanger is that it is a device mainly radiative heat transfer with negligible convective component, for deeper heat recovery is required to link it with the subsequent convective stage of heat exchange of the number of known structures is a needle, a tube of smooth tubes, thermal blocks, etc. in full all of them high blocking in combination with very difficult access to remove deposits from the surfaces of the heat transfer walls during operation.

An object of the invention is the design of radiation-convective heat exchanger, providing a deeper waste heat of exhaust gases due to the intensification of convective heat transfer with simultaneous decrease of securemote surfaces of the heat transfer walls and facilitating their cleaning during operation.

This is achieved in that the radiation-convection heat exchanger spiral type, comprising a housing with a nozzle inlet and outlet of heating and heated environments, has a body coocooboonah spiral, and the inner surface of the housing formed by the two belt surfaces in the form of conical helices, forming a parallel respectively to form two adjacent spiral heat transfer surfaces that belong to the specified channel L-shaped section in the housing wall.

In Fig. 1 shows a radiation-convection heat exchanger spiral type in a partial section, Fig. 2 is a view of A.

The heat exchanger includes a housing 1 with the channel L-shaped (angular) of section 2 in the body of the housing, a nozzle inlet 3 and outlet 4 of the heated medium, inlet 5 and outlet 6 of the heat medium.

The heat exchanger works as follows: the heating medium is supplied through the pipe 5 and out through the pipe 6, and the heating medium respectively through tubes 3 and 4; when driving the heating environment, interacting with spiral surfaces 1-1 and 1-2, twists, thanks to intensified mass-heat transfer from the middle of the flow of heating medium to its periphery and is turbulent flushing of the entire heat transfer surface. Thus, in this heat exchanger through the same heat transfer surface with radiation is very intense convective heat transfer benefit is heated environments.

The necessary heat resistance and durability of the heat exchanger with variable heat mode and high pressure environments provides practical possibility of making it in celolita performance of heat-resistant alloys, i.e., without welds.

The configuration of the heat transfer surface of the heat exchanger determines the decrease in the degree of pollution and nastrugannoy cleaning this surface during operation.

Claims

Radiation-convection heat exchanger spiral type, comprising a housing with a nozzle inlet and outlet of heating and heated environments, characterized in that the housing has a tapered spiral-step form, in the body wall of the housing has a channel L-shaped (angular) cross section in the form of a conical spiral and an inner surface of the housing formed by the two belt surfaces in the form of conical helices, forming a parallel respectively to form two adjacent heat spiral surfaces that belong to the specified channel L-shaped section in the housing wall.

 

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