Method and equipment for detecting burning rate of pulverized coal

Abstract

The invention relates to a method and equipment for detecting burning rate of pulverized coal, belonging to the technical field of physical and chemical detection in metallurgical engineering. The method comprises the steps of: preparing coal samples, continuously blowing air, collecting unburned pulverized coal, collecting mixed gas, detecting by using a gas analyzer, burning in a muffle furnace and calculating burning rate. The equipment comprises a hot air furnace (1), a coal injection bottle (8), a burning furnace (3), an N2 gas source, a three-way ash collection groove (5), a gas collection bag (6) and a dust collector (7). The method and the equipment for detecting the burning rate of pulverized coal solve the problems that the burning rate of the equipment of the background technique is generally low and the unburned pulverized coal is difficult to collect, continuous injection is realized, and enough unburned pulverized coal (1g required by the national standard) and mixed gas can be collected. The accuracy of the detected burning rate of pulverized coal is high, the operation is simple and convenient, the repeatability is good, reference data for flammability of the kind of the injected pulverized coal can be provided for a blast furnace, and on the premise that the condition of the blast furnace is smooth, the benefit of coal injection is maximized by improving the burning rate of the pulverized coal.

Description

technical field [0001] The invention relates to a method and equipment for detecting the combustion rate of pulverized coal, belonging to the technical field of metallurgical engineering physical and chemical detection. Background technique [0002] Blast furnace pulverized coal injection is a technology developed in the 1980s, and it has become one of the main technical means adopted by blast furnaces in various countries to reduce the cost of pig iron and optimize the process structure. However, excessive injection of pulverized coal into the blast furnace will reduce the combustion rate of pulverized coal before the tuyere and increase the amount of unburned pulverized coal, which will bring a series of adverse effects to the normal smelting of the blast furnace. Therefore, the combustion rate of pulverized coal must be considered in the process of pulverized coal injection in the blast furnace, and the combustion rate should be increased as much as possible to maximize t...

AI Technical Summary

Problems solved by technology

At present, the method of detecting the combustion rate of pulverized coal can roughly measure the level of the combustion rate, but there are the following shortcomings: 1. The combustion rate is low

The combustion rate of pulverized coal obtained by existing means is all low, generally only about 40%~50%

2. During the detection process, the injection of pulverized coal is mostly intermittent, the stability of coal injection rate and carrier gas flow cannot be guaranteed, and the combustion time is not easy to control, so the measured combustion rate has a large error

3. It is difficult to collect pulverized coal and gas by existing test methods, and even if pulverized coal can be collected, its quality cannot meet the requirements (the national standard is 1g)

At the same time, the unburned pulverized coal in the system has a high temperature and cannot be collected directly. It needs to be cooled with water, filtered, and dried before being collected. The operation procedure is cumbersome and the error is large.

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