Method for coke dry quenching by coal internal heat smouldering

Abstract

The invention discloses a method coke dry quenching by coal internal heat smouldering. In the method, high temperature carbonized coal gas produced by carbonized dry quenched coke is made into cool coal gas by washing and collecting tar; after the cool coal gas passes a circulating fan, part of the coal gas is introduced into a burner to be synthesized with high temperature waste gas into high temperature mixed gas satisfying the coal smouldering requirement; the high temperature mixed gas enters into a carbonization section of a coke oven to be used as a carbonization heat source; the other part of pure coal gas passing the circulating fan is introduced to a coke quenching and cooling section of a carbonization furnace by a booster fan to be used as an inertia medium of Ramsbottom coke and quenched coke; the cool coal gas passing the coke quenching and cooling section of the carbonization furnace absorbs the heat and then passes the carbonization section of the coke oven to carry out nonoxidation heating or weak-oxidation heating towards the coal together with the carbonization heat source to realize combustion-free circulation. The method simplifies the coke dry quenching technology, reduces the water content of the Ramsbottom coke, uses the heat of the Ramsbottom coke before coke quenching effectively, improves the utilization rate of the pure coal gas, reduces the use of combustion-supporting gas and accordingly reduces the energy consumption of the burner.

Description

technical field [0001] The invention relates to the technical fields of coal chemical industry, new energy and environmental protection, and relates to a coal dry distillation method, in particular to a coal internal thermal low-temperature dry distillation dry quenching method, which is suitable for the production process of semi-coke. Background technique [0002] Parts of northern my country are rich in coal resources and of good quality, which are low-ash, low-sulfur, low-phosphorus, and high-volatile weakly sticky and non-sticky coals. Utilizing this non-coking coal low-temperature dry distillation to refine ferroalloy coke (also known as semi-coke or semi-coke) industry is currently the main coal conversion industry in the local area. [0003] For semi-coke production enterprises in Shanxi, Shanxi, Ningmeng and Ningmeng areas of our country, there are currently five main problems. First, the internal heat adopts the method of combustion heating with air and gas in the ...

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Problems solved by technology

[0003] For semi-coke production enterprises in Shanxi, Shanxi, Ningmeng and Ningmeng areas of our country, there are currently five main problems. First, the internal heat adopts the method of combustion heating with air and gas in the furnace, and the combustion exhaust gas is mixed into the gas. It not only reduces the calorific value of the gas, not only increases the processing capacity of the purification system, but also is not conducive to comprehensive utilization; second, the yield of tar is low, and the tar in the gas is washed by circulating water spray condensation method and separated by natural precipitation. The separation of tar is not complete; the third is that there is no reasonable way to use gas, and the gas is mainly discharged through direct combustion; the fourth is that the equipment and operating system have not been optimized; the fifth is that environmental pollution and ecological problems are prominent, and resources are wasted.

[0007] (1) A large amount of physical heat carried by semi-coke cannot be effectively recovered and utilized, resulting in a reduction in energy utilization efficiency;

[0008] (2) Porous semi-coke absorbs a large amount of water. According to relevant statistics, the water absorption of semi-coke can reach more than 45% of the weight of semi-coke, which cannot meet the needs of users. The finished product has to be baked and dehumidified again. The large energy consumption has become an urgent problem to be solved in the production and energy saving of enterprises

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