Heat exchanger suitable for jet heating technology

Abstract

The invention discloses a heat exchanger suitable for a jet heating technology. The heat exchanger is internally arranged in a jet air box of a preheating section, and comprises a box body, an upper pipe plate, a lower pipe plate and heat exchanger pipe bundles; the upper pipe plate is horizontally arranged above the interior of the box body, the lower pipe plate is horizontally arranged below theinterior of the box body, the multiple heat exchanger pipe bundles are provided and arranged between the upper pipe plate and the lower pipe plate, the upper ends of the heat exchanger pipe bundles are connected with the upper pipe plate, and the lower ends of the heat exchanger pipe bundles are connected with the lower pipe plate; and multiple jet nozzles are connected to the lower end of the box body, an upper pressure equalizing cavity is formed in the upper ends of the heat exchanger pipe bundles, and a circulating gas inlet is formed between the upper pressure equalizing cavity and the upper end of the interior of the box body. According to the heat exchanger, the pipeline of the preheating section can be greatly shortened, and the heat efficiency of comprehensive utilization of residual heat energy of the combustion waste gas of a radiant pipe can be improved.

Description

technical field [0001] The invention relates to the field of continuous heat treatment of cold-rolled steel strips, and more specifically relates to a heat exchanger suitable for jet heating technology. Background technique [0002] In order to reduce energy consumption, the traditional practice of continuous heat treatment technology of cold rolled strip is to preheat it with preheating device before the strip heat treatment area. At present, the gas used in the preheating section of large-scale vertical continuous annealing furnace is generally nitrogen-hydrogen protective gas, and the combustion exhaust gas of radiant tube is rarely used to directly heat strip steel. [0003] At present, the commonly used heating methods in the preheating section are as follows: figure 1 As shown, the combustion exhaust gas from the radiant tube 1 enters the gas collection chamber 2 and is pressurized by the exhaust fan 3, then flows through the main valve 4 and enters the heat exchanger...

AI Technical Summary

Problems solved by technology

The disadvantage of this design method is: the installation of the heat exchanger outside the preheating furnace will make the piping layout of the entire preheating section more complicated, and the pressure and heat loss along the way will be relatively large, which will affect the waste heat recovery efficiency of the preheating section. This design is suitable for situations where the residual heat energy of the exhaust gas is high

However, in many cases, the residual heat energy of the exhaust gas is low. If the traditional method is used, the amount of waste heat recovery will be very limited.

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