A large-capacity circulating heating and drying system and a heating and drying method thereof

Abstract

The invention discloses 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, and are used to detect the moisture content in the coal samples or make the coal samples reach an air balance state, belonging to coal The field of quality inspection and acceptance. The system of the invention includes a gas delivery and pretreatment device, a heating and drying device, and a gas purification and circulation device, and the three devices are connected in pairs through gas pipelines to form a loop. Through the selection of three gas adjustment modes, the dual-purpose functions of nitrogen drying and air drying are realized. At the same time, it can not only achieve the maximum heating and drying test efficiency, but also process nitrogen for recycling and reuse, effectively reducing nitrogen. The cost.

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 field. 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 furnac...

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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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