SU756136A1 - Radiation-heater - Google Patents

Description

The invention relates to radiation. Heaters can also be used to heat continuous roller, pusher, conveyor, chamber heat-treatment furnaces with 5 protective controlled atmosphere.

Radiation heaters are known that contain a radiating tube with a mixer coaxially mounted at the inlet, forming an annular air supply channel with the radiating pipe, at the outlet of which a conical stabilizer mounted on the mixer and a heat exchanger located in the outlet section of the tube [ί] are placed. 15

However, this device is characterized by insufficient heating uniformity and low control limits.

The purpose of the invention is an increase of 20

heating uniformity and expansion of regulation limits.

This goal is achieved by the fact that the mixer at the outlet is equipped with a hemispherical perforated 25 nozzle nozzle, in the annular channel for supplying air to the coaxial mixer is installed a shell with confusable at the entrance and diffuser at the exit, tightly adjoining}

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to the walls of the radiating tube, and the heat exchanger is made in the form of Field tubes, tightly interconnected by plates.

FIG. 1 shows a radiation heater, a longitudinal section ’,’ in FIG. 2 shows section A-A in FIG. one; in fig. 3 - torch of the radiation heater, longitudinal section.

Radiation heater contains a radiating pipe 1 with a gas pipe 2 and the pipe 3 air supply. At the entrance to the pipe 1, a mixer 4 is installed, forming with the gas pipe 2 an annular channel 5 for supplying primary air to the mixer 4, and with a pipe 2 - an annular channel 6 for supplying secondary air to the combustion zone.

At the exit of the channel 5 is mounted mounted on the mixer 4 conical stabilizer 7.

The mixer 4 at the outlet is equipped with a hemispherical perforated nozzle nozzle 8. In the annular channel 6 for supplying air to the coaxial mixer 4 there is a shell 9 with confusable at the inlet and diffuser at the exit. Shell 9 tightly adjacent to the walls of the radiating

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756136

four

pipes 1. At the outlet of pipe 1, a heat exchanger 10 is installed, made in the form of Field 11 pipes, tightly interconnected by plates 12.

For removal of combustion products, a nozzle 13 is provided, mounted on the pipe 1. To enter the pilot in the pipe 1 from the side of the heat exchanger 10 a pipe 14 is installed.

Radiation heater works as follows.

Gas through the pipe 2 is fed into the mixer 4, where it is mixed with air entering the mixer 4 through the annular channel 5 formed between the gas pipe 2 to the walls of the mixer 4, and the amount of air entering the mixer 4 is 40% of the theoretically necessary for complete combustion of gas. Before entering the mixer 4, the air is heated in the recuperator 10, where it is supplied through the nozzle 3. The air required for complete gas combustion is supplied to the annular channel 6 formed between the mixer 4 and the shell 9 and further, bypassing the confused portion of the shell 9, falls into combustion zone. The products of combustion are washed by the heat exchanger 10 and are discharged to the outside through the nozzle 13 for removal of the products of combustion.

Ignition of the radiation heater is carried out using an igniter introduced through pipe 14. The design of the burner of the radiation heater provides a constant gas burnout along the length of the radiating pipe 1 without soot formation and local overheating of the elements with an overall air flow rate of 1.05-1.07

within fuel control 1: 8.

The implementation of the heat exchanger 10 in the form of Field's pipes 11, which are tightly interconnected by the plates 12, contributes to a deeper heat recovery of the leaving combustion products, thereby increasing the fuel efficiency and service life of the heat exchanger and other elements of the radiation heater.

Claims (1)

Claim A radiation heater containing a radiating tube with a mixer coaxially mounted at the inlet, forming an annular air supply channel with the radiating tube, at the outlet of which there is a conical stabilizer fixed on the mixer and a recuperator located in the outlet section of the tube that in order to increase the uniformity of heating ordering and extending the limits of regulation, the mixer is equipped with a hemispherical perforated nozzle nozzle in the annular air supply channel, the coaxial shell with a confuor inlet and outlet diffuser sections tightly attached to the walls of the radiating pipe is installed to the coaxial mixer tightly interconnected by plates. 35