Control system and method for reducing oxynitride in coke oven waste gas

Abstract

A control system and method for reducing oxynitride in coke oven waste gas are disclosed. The control system comprises a coke oven, a temperature detection system, a heating automatic control system, a coking end time automatic judging model, a coking coal maturity model, a target coke oven flue temperature model, a gas flow control unit, and a sub-flue suction control system. The control method comprises the following steps: detecting the temperature of raw gas in a coke oven, the online flue temperature, and coke cake temperature by a temperature sensing probe, sending the raw gas temperature to the coking end time automatic judging model and coking coal maturity model; sending the CI and K values to the target coke oven flue temperature model by the coking end time automatic judging model and coking coal maturity model, sending the target coke oven flue temperature (Ts) to the heating automatic control system by the target coke oven flue temperature model; and controlling the heating automatic control system to control the gas flow control unit and the sub-flue suction control system to feed gas and sub-flue waste gas into the coke oven. The provided control system and method can prominently reduce the oxynitride discharge, and have the advantages of easy promotion and application, and low investment and operation cost.

Description

technical field [0001] The invention belongs to the technical field of coke oven coking automation, and in particular relates to a control system and a control method for reducing nitrogen oxides. Background technique [0002] Nitrogen oxides, as pollutant emissions, have had a huge impact on human health and the ecological environment. In terms of human health, nitrogen oxides will have a strong stimulating effect on human eyes and respiratory tract, and in severe cases, it will cause bronchitis and produce rotten candles to the lungs. In terms of the ecological environment, nitrogen oxides are one of the main substances that cause acid rain, the greenhouse effect, and the destruction of the ozone layer. At the same time, nitrogen oxides are also the main component of the current smog in my country. [0003] The rapid development of my country's iron and steel metallurgical industry for decades has led to the rapid development of the coking industry, which provides importa...

AI Technical Summary

Problems solved by technology

The main technical means of post-combustion control is flue gas denitrification, that is, the coke oven flue gas is extracted, heated to 400-500°C, and then chemically reacts with ammonia under the action of a catalyst to remove NOx in the flue gas. The one-time investment of this method is very large, about 30 million yuan or more, and the operating cost is also very high, the annual operating cost is not less than 5 million yuan, which is unbearable for coking enterprises currently struggling on the profit / loss line cost of

Images