Production technique for improving heat exchange efficiency of heat pipe type preheater of hot air furnace

Abstract

The invention relates to a production technique for improving the heat exchange efficiency of a heat pipe type preheater of a hot air furnace. The production technique for improving the heat exchange efficiency of the heat pipe type preheater of the hot air furnace comprises the technological steps that firstly, the reason for the reduction of the heat exchange effect is found out; secondly, the reduction of the heat exchange efficiency is confirmed; thirdly, the operation condition of working media in a heat pipe is confirmed; fourthly, a large amount of non-condensable gas in the heat pipe is exhausted; fifthly, fluid working media are supplemented; and finally, the maintenance effect is evaluated. According to the production technique, the operation is easy and convenient; the investment is small; the high benefits can be achieved continuously; the environment friendliness, equipment and wind temperature quality are not affected; the highly-efficient application of the preheater can be prolonged; and the investment for replacing the heat pipe or the whole preheater equipment is reduced.

Description

Technical field [0001] The invention belongs to the technical field of blast furnace hot blast stove production technology, and relates to a production process for improving the heat exchange efficiency of the heat pipe preheater of the hot blast stove. Background technique [0002] At present, most hot blast stoves adopt flue gas waste heat recovery to preheat combustion-supporting air and coal gas. The heat pipe type accounts for about 70% of the types of heat exchangers used. However, after a period of operation of the heat pipe preheater, the Changes in thermal principle factors usually result in a decrease in heat exchange efficiency, resulting in a decrease in blast furnace air temperature or an increase in the amount of mixed gas used to increase the calorific value of the gas, and an increase in fuel costs and iron costs. [0003] After the heat exchange efficiency of the previous preheater decreased, because I did not find the reason from the heat exchange principle and ot...

AI Technical Summary

Problems solved by technology

[0002] At present, most hot blast stoves adopt waste heat recovery from flue gas to preheat combustion-supporting air and gas. Heat pipe type accounts for about 70% of the types of heat exchangers used. Changes in thermal principle factors usually lead to a decrease in heat transfer efficiency, resulting in a decrease in blast furnace air temperature or an increase in the amount of mixed gas mixed to increase the calorific value of gas, increasing fuel costs and iron costs

[0003] After the heat exchange efficiency of the preheater decreased, no solution was found because the heat exchange principle and other aspects were not found. After the preheating, the temperature of the gas and air decreased, the air temperature decreased, and the fuel consumption and iron cost increased. Wait until the preheater is used for 3 to 4 years to replace a complete set of heat pipes or preheaters, resulting in the long-term waste heat of the hot blast stove exhaust gas not being effectively recovered, low return on investment and increased reinvestment