System for preheating coal gas or air of blast furnace hot blast stove by using waste heat of ascending pipe

Abstract

The system comprises a pipe body, a waste heat exchanger and a gas-liquid diverter, the interior of the pipe body can be divided into a heated chamber through a partition plate, and the upper portion of the interior of the pipe body is divided into a gas preheating chamber and an air preheating chamber through a partition plate at the top of the partition plate; a heat pipe penetrating through the coal gas preheating chamber, the air preheating chamber and the heated chamber is installed in the pipe body, a steam pipe is installed at the bottom in the heat pipe, a liquid chamber is arranged between the steam pipe and the heat pipe, and fins are installed on the outer side of the heat pipe in a graded mode. Heat is transferred to liquid stored in the liquid chamber through the wall of the heat pipe, the liquid is boiled and evaporated after absorbing the heat and is converted into steam, the steam releases latent heat of vaporization outwards, coal gas or air obtains the heat, the purpose of preheating the coal gas and the air at the same time is achieved, and heat transfer of the cold section and the hot section of the heat pipe can be enhanced according to the fins. And the defect of low gas-gas heat exchange coefficient is overcome.

Description

technical field [0001] The invention relates to the technical field of blast furnace hot blast preheating, in particular to a system for double preheating blast furnace hot blast stove gas or air by utilizing the waste heat of a rising pipe. Background technique [0002] When the coke oven exhausts smoke, it will be discharged through the riser, and the flue gas in the riser contains a lot of waste heat, so it is necessary to recycle the waste heat of the flue gas in the riser, but the existing blast furnace hot blast stove gas or air double The preheating system can only perform a single heat exchange, and cannot preheat the gas and air at the same time, resulting in low heat exchange efficiency. At the same time, the existing preheating device is limited by the heat exchange area, resulting in a low heat exchange coefficient between gas and air. , At the same time, because the flue gas contains a large amount of dust, and a large amount of ash not only easily causes fire, ...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a system for double preheating the gas or air of the blast furnace hot blast stove by using the waste heat of the riser tube, so as to solve the problem that the gas and air cannot be preheated at the same time in the above background technology, resulting in low heat exchange efficiency and low heat transfer efficiency. Ash is not only easy to cause fire, but also reduces the heat transfer efficiency of the preheater and increases the resistance of heat exchange

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