High-moisture coal segmental dehydration drying system and its application method

Abstract

The invention discloses a segmented water removing and drying system for high-humidity coal and an application method for the segmented water removing and drying system. The system comprises a discharging mechanism. A first microwave drying mechanism is arranged below the discharging mechanism and internally provided with a first conveying mechanism. A solid-liquid separation mechanism is arranged at the tail end of the first conveying mechanism. A second conveying mechanism is arranged at an outlet of the solid-liquid separation mechanism. A second microwave drying mechanism is arranged at the tail end of the second conveying mechanism. The segmented water removing and drying system has the beneficial effects that a microwave heating manner and a non-heating manner are combined with the water removing and drying technology, a heat water removing manner and a non-heat water removing manner are organically combined, water in coal is removed in the form of a liquid state on the basis of low-rank coal microwave drying, and energy consumption of a microwave drying system is greatly reduced; raw coal is heated through the reutilization of residual heat and waste heat generated by the drying system, and the economical efficiency of the whole drying system is improved; and after deep drying is carried out, utilization of later finished coal is more flexible and safer, and the processing cost is reduced.

Description

technical field [0001] The invention relates to coal drying, in particular to a segmental dehydration drying system for high-humidity coal and its application method. Background technique [0002] In recent years, from the perspective of my country's primary energy consumption structure and trends, although the proportion of low-rank coal in my country's primary energy consumption has declined, its production and consumption continue to increase, and the shortage of high-rank coal resources has gradually become a problem that my country must face. outstanding issues. The low-rank coal reserves in my country account for 40% of the total coal reserves, of which lignite accounts for about 12.8% of the total coal reserves in my country. Low-rank coal is playing an increasingly important role in the energy supply process. [0003] High-moisture coal mainly refers to (low-rank coal with high moisture content (30%-65%)) which is not conducive to long-distance transportation and sto...

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Problems solved by technology

The patent with application number CN201210221818.7 uses microwave drying to dry the filter cake with a moisture content of 30%. However, the moisture is removed in gaseous form, which obviously consumes a lot of energy, and the filter cake will be broken and changed during the dehydration process. some physical properties of the filter cake

In addition, the patent application number CN200910259256.3 uses microwaves to heat and dehydrate pre-dried coal, and uses the waste heat of drying to perform hot pressing or thermoplastic molding. However, this patent mainly emphasizes hot pressing or thermoplastic molding processes and waste heat At the same time, the moisture in coal is also removed in gaseous form, which consumes a lot of energy

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