Lump coal pyrolysis experimental method for melting gasification furnace

Abstract

The invention belongs to the field of test of lump coal properties and particularly relates to a lump coal property test method for a melting gasification furnace. A lump coal pyrolysis experimental method for the melting gasification furnace comprises three steps, namely lump coal mechanical strength experiment, lump coal coking characteristic experiment and lump coal semicoking strength experiment; a coal sample with the particle size of over 6 millimeters is used as a sample and prepared into 5 to 20 kilograms of samples; and a large-sized coking experiment coke furnace is used. In the lump coal pyrolysis experimental method for the melting gasification furnace, the experiment coke furnace, the sample and the process can better simulate states of lump coals in the melting gasification furnace, so that the problem of low discrimination of the conventional heat stability experiment can be solved; furthermore, the lump coal species for the melting gasification furnace, which are suitable for a COREX process can be selected accurately and effectively, the selection range of the lump coals for the COREX is expanded, and the iron-making cost of the COREX process is reduced.

Description

technical field [0001] The invention belongs to the field of lump coal performance testing, in particular to a method for testing the lump coal performance of a melting gasifier. Background technique [0002] COREX is a typical two-step smelting reduction ironmaking process. It consists of a melter-gasifier and a shaft furnace. Coal and oxygen are used to burn coal and oxygen in the lower tuyere circulation area of ​​the melter-gasifier to supply heat for the metallurgical process. Iron ore pellets, Lump ore is added from the top of the reduction shaft furnace and is reduced to sponge iron by the reducing gas of the melter-gasifier during the process of falling in the shaft furnace. This process was developed by VAI. It is different from the traditional blast furnace process based on coking coal. It can directly use non-coking coal, natural lump ore and pellets as raw materials to produce molten iron. The COREX process directly uses non-caking or weakly cohesive lump coal, ...

AI Technical Summary

Problems solved by technology

[0007] The test methods mentioned above have disadvantages for COREX process coal preparation. Facts show that the thermal stability test method of lump coal currently used is not good in discrimination. The results of several lump coal samples of different varieties and origins are basically the same, but different The performance of the lump coal in the melter gasifier is definitely different, which is caused by the irrationality of the test method

[0008] The heat storage capacity of the muffle furnace is small, and the temperature in the furnace will be affected by the addition of coal lumps in the test. In the test, the heating rate and the particle size of the coal sample play a key role in the results. In addition, the particle size of the lump coal used in the test is 16. ~20mm, which is too different from the actual particle size of 5~50mm into the furnace. The larger the particle size, the easier it is to burst, so the existing test methods cannot correctly evaluate the actual application value of the lump coal in the melting and gasifier

Images