Pulverized coal suspension combustion characteristic trial furnace for cement kiln

Abstract

The invention discloses a pulverized coal suspension combustion characteristic trial furnace for a cement kiln. The pulverized coal suspension combustion characteristic trial furnace comprises an air source system, a hot air gun, an L-shaped quartz tube, a furnace body heating system and a suspension furnace body temperature monitoring and collecting system, wherein air with proper pressure flow velocity is supplied through the air source system, and is pre-heated through the hot air gun and then the pre-heated air is introduced into the furnace body heating system from the L-shaped quartz tube, so that the input pulverized coal is combusted in a suspension state; the data of temperature changingalong with timein a pulverized coalcombustion process can be acquired by virtue of the suspension furnace body temperature monitoring and collecting system; a curve of the temperature changing along with time of the pulverized coal in the suspension and combustion state is drawn, so that the combustion thermal characteristic of the pulverized coal can be evaluated according to the curve. Compared with the general thermoanalysis technology of the pulverized powder, the trial furnace has the advantages that when the required testing temperature is reached and the heat balance is achieved,the test and calculation of samples to be tested can be completed for only 10 minutes, so that the trial furnace is quick and convenient to operate, and high in accuracy; meanwhile, continuous experiment can also be carried out without generally needing to wait the reduction of the temperature to the room temperature like thermogravimetric analysis, and therefore, a large amount of time can be saved.

Description

technical field [0001] The invention relates to the field of thermal analysis instruments, in particular to a test furnace for coal powder suspension combustion characteristics used in cement kilns. Background technique [0002] The combustion characteristics of pulverized coal are one of the important contents of the theoretical research on coal combustion. For the coal used in the cement industry, the combustion of fuel is the key to the operation of the new dry process production line. Therefore, in-depth research on the combustion characteristics of coal pulverized The evaluation and analysis of various pulverized coal is of positive significance for optimizing the combustion conditions of pulverized coal, improving the working conditions of the cement production line, improving the quality of cement production, and reducing the cost of cement production. [0003] In the early days, the research on the ignition of pulverized coal particles mainly used the horizontal tube...

AI Technical Summary

Problems solved by technology

In the early days, researchers used thermobalances to study the combustion characteristics of pulverized coal, but there were many factors that were affected, and the burnout time obtained from different thermobalance experiments was not the same. Different results will be obtained depending on the amount of powder, the speed of heating, etc.

At the same time, because the heating rate is too low, it is quite different from the actual working conditions in the furnace.

[0004] These coefficients are all based on the static combustion of pulverized coal. Although the combustion of pulverized coal in the cement industry can be evaluated and predicted to a certain extent, there is still a big difference between the combustion state and the actual cement production.

Moreover, due to the particularity of the combustion conditions of coal used in cement industry production, these evaluation methods for combustion characteristics are not necessarily suitable for the actual production needs of the cement industry.

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