High temperature heat exchanger

Abstract

The invention discloses a high temperature heat-exchanger for recovering the heat quantity for the high temperature smoke, which comprises the following parts: a heat-exchanger body, a high temperature smoke intake at the front end of the heat-exchanger body, a high temperature smoke exit at the back end of the heat-exchanger body. The heat-exchanger body comprises the following parts: a high temperature region heat-exchanger in the front portion, a low temperature region heat-exchanger with shell pass intake element communicated with the high temperature region heat-exchanger in the back portion. The high temperature region heat-exchanger comprises the following parts: the first high temperature section in the front, the second high temperature section at the back communicated with the first high temperature section, wherein the first, second high temperature section and the front and back end of the low temperature region heat-exchanger are equipped with the tube plate, the first temperature section and the second high temperature section are connected with the hollow intermediate connector, the first high temperature section is equipped with the shell pass exit element. The invention only needs changing the first high temperature section and doesn't need changing the total high temperature region heat-exchanger when the short life first high temperature section damages, which maintains easily and saves the cost.

Description

High temperature heat exchanger 【Technical field】 The invention relates to a high-temperature heat exchanger, in particular to a high-temperature heat exchanger for recovering heat from high-temperature flue gas. 【Background technique】 The high-temperature heat exchanger is a device used for cooling and recovering heat from the large flow of high-temperature flue gas generated from the incinerator. Usually, in the production line of colored coated steel sheets, the gas generated by the spraying process in the spray curing room is mixed with combustible substances that are harmful to the environment, so it needs to be treated harmlessly before being discharged into the atmosphere, usually after the harmful gas is drawn , add a certain proportion of coal gas, mix and enter the incinerator for combustion, the generated high-temperature flue gas (about 800 ℃) enters the high-temperature heat exchanger tube side for heat recovery, and then passes through the high-temperature z...

AI Technical Summary

Problems solved by technology

The high-temperature flue gas drops from about 800°C at the inlet to about 300°C at the outlet, and the high-temperature heat exchanger expands due to heat expansion. The amount of elongation will lead to the phenomenon of tube breakage, crack deformation of the tube sheet, and deformation of the pipeline due to thermal expansion, which seriously develops to the point that the heat exchange effect cannot be guaranteed.

Due to the constraints of the above factors, when the commonly used high-temperature heat exchangers are applied to the color coating production line, the stability of continuous operation is poor, and the service life is not ideal.

In some cases, the equipment has not been put into production for a long time, and problems such as cracks in the tube plate, cracks in the tube plate, and deformation of the pipeline have occurred, and the maintenance time is long, which greatly affects the normal and stable operation of the color coating production line.

The above-mentioned tube breakage, crack deformation of the tube sheet, and deformation of the pipeline due to thermal expansion mainly occur at the front of the heat exchanger in the high temperature area. Poor, and the maintenance process often needs to replace the entire heat exchanger in the high temperature area, resulting in difficult and complicated maintenance and high cost

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