Drying gas temperature and flow self-regulating control device and method in coke drying system

Abstract

The invention discloses a coke drying system dry gas temperature and flow self-adjustment control device and method. A high-temperature waste gas branch pipe and a low-temperature waste gas branch pipe are arranged at the front end and the rear end of a heat exchanger, flow control valves are arranged on the branch pipes, a temperature sensor is arranged on a dry gas header pipe behind an induced draft fan, and high-temperature waste gas and low-temperature waste gas are controlled by the temperature sensor and the flow control valves on the two branch pipes to be mixed to reach the temperatures needed by the coke drying process. The high-temperature hot blast stove flue waste gas branch pipe and the low-temperature hot blast stove flue waste gas branch pipe are arranged at the front position and the rear position of the hot blast stove flue waste gas heat exchanger, flow of the two branch pipes is controlled through feedback of the temperature sensor, the dry gas temperature self-adjustment function can be achieved, graded recycling of hot blast stove flue waste flue gas heat can also be achieved, waste of waste gas heat is avoided, and remarkable economic benefits and energy-saving benefits are achieved.

Description

technical field [0001] The invention belongs to the technical field of adjustment and control, and can be used for adjusting and controlling the temperature and flow of drying gas in a coke drying system in the iron and steel smelting industry, and in particular relates to a self-adjusting control device and method for drying gas temperature and flow in a coke drying system. Background technique [0002] Coke is an essential raw material in the blast furnace ironmaking process, and its quality is crucial to the stability of blast furnace production, technical and economic indicators, and the life of the blast furnace hearth. Because the moisture content of coke changes greatly during the process of production, storage, transportation, etc., the moisture content of coke entering the furnace is relatively high, and the fluctuation of coke moisture will cause inaccurate weighing, thus affecting the stability of furnace conditions. Studies have shown that every 1% increase in co...

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Problems solved by technology

However, during the implementation of the above method, the following negative effects caused by cold air entering the coke drying system were not considered: (1) Coke is a fuel for blast furnace ironmaking to provide heat, and cold air will reduce the oxygen content of the drying gas. As a result, there is a safety hazard of spontaneous combustion of coke in an environment with high temperature and high oxygen content; (2) Using cold air to adjust the temperature of the drying gas will waste the precious heat of the exhaust gas of the hot blast stove to a certain extent

In addition, because the above method lacks the means to adjust the exhaust gas flow, it cannot meet the stable operation under variable working conditions, and cannot realize the economical and reasonable utilization of the exhaust gas heat.

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