High-capacity cyclic heating and drying system and heating and drying method thereof

Abstract

The invention discloses a high-capacity cyclic heating and drying system and a heating and drying method thereof, is suitable for heating and drying all kinds of coal samples, is used for detecting the moisture content in the coal samples or enabling the coal samples to reach an air balance state, and belongs to the field of coal quality inspection and acceptance. The system involves a gas conveying and pretreating device, a heating and drying device and a gas purifying and circulating device, and every two of the three devices are connected through a gas pipeline so as to form a loop. By selecting three gas adjusting modes, the dual-purpose functions of nitrogen introduction drying and air drying are achieved, meanwhile, the heating and drying test efficiency can be achieved to the maximum extent, and nitrogen can be recycled after being treated, so that the nitrogen use cost is effectively reduced.

Description

technical field [0001] The invention relates to a large-capacity circulating heating and drying system and a heating and drying method thereof, which are suitable for heating and drying all kinds of coal samples to detect the moisture content in the coal samples or to make the coal samples reach an air equilibrium state, belonging to the coal quality Inspection area. Background technique [0002] In the coal quality inspection and acceptance work, moisture is one of the important coal quality analysis parameters. For coal entering the factory, excessive moisture will not only affect the coal quantity and quality acceptance of power generation enterprises, but may also cause oxidation and spontaneous combustion of coal stored in the open air; for coal entering the furnace, water evaporation consumes heat, and water vapor increases the amount of flue gas. The heat loss of exhaust smoke and the power consumption of induced draft fan are increased. At the same time, the furnace...

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Problems solved by technology

[0004] The purpose of the present invention is to overcome the deficiencies in the prior art, and provide a large-capacity circulating heating and drying system and its heating and drying method with reasonable structure design and simple and reliable test method, which are suitable for heating and drying all kinds of coal samples , to detect the moisture content in the coal sample or to make the coal sample reach an air equilibrium state, so as to solve the problem of high cost due to the large waste of nitrogen in the heating and drying process of the coal sample, the change of the temperature field in the device affects the test results, and the volume of the equipment Problems such as small test efficiency underground, single gas path, unable to carry out nitrogen / air dual-function heating and drying, etc.

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