System Overview

The so-called dry quenching refers to a method of quenching red coke by using inert gas to cool it down. During the dry quenching process, red coke is loaded from the top of the dry quenching furnace, and low-temperature inert gas is blown into the red coke layer in the cooling section of the dry quenching furnace by the circulating fan, absorbing the moisture and heat of the red coke. The cooled coke is discharged from the bottom of the dry quenching furnace, and the high-temperature inert gas from the annular flue of the dry quenching furnace flows through the dry quenching boiler for heat exchange. The boiler produces steam, and the cooled inert gas is blown back into the dry quenching furnace by the circulating fan. The inert gas is circulated and used in a closed system.

During dry quenching operation, a small amount of air may leak into the negative pressure section of the gas circulation system, O₂Through the red coke layer, it will react with coke to generate C0₂. CO₂In the high-temperature zone of the coke layer, it will be reduced to CO again. As the number of cycles increases, the concentration of CO in the circulating gas becomes higher and higher. In addition, the residual volatile components of coke are always precipitating, and the H generated by coke pyrolysis₂, CO、 CH₄All of them are flammable and explosive components, so controlling the concentration of flammable components in the circulating gas below the explosive limit is a necessary condition for safe production during dry quenching operation.

System Introduction

The ZN-CDQ online analysis system is installed on the flue from the fan outlet to the quenching chamber to analyze the oxygen content in the circulating gas online₂The CO、CO₂、 H₂The content of the product provides a guarantee for optimizing the process and preventing safety accidents. Due to the presence of tar, dust, benzene, and naphthalene in dry quenching gas H₂S and pollutants such as water vapor make the sample gas pretreatment system the core of the entire analysis system.

〓pretreatment system

Regarding the dry quenching flue gas containing tar, dust, benzene, naphthalene H₂We adopt a dual filtration sampling device to effectively filter impurities in the sample gas, such as S and water vapor pollutants. Cooperate with regular nitrogen purging to ensure that the sampling device is not blocked and the system runs stably.

▲ Characteristics of sample gas pretreatment system:

Cascade combination of stainless steel preprocessor and precision processor

Directly installed at the sampling point together with the sampling probe

Blow off the exhaust gas and directly recycle it into the flue

High temperature resistant, anti erosion and anti blocking sampling probe

Hold your breath and blow to ensure the smooth operation of the sample gas pretreatment system without blockage