Lignite-drying and quality-improving process for preparing superheated steam from waste heat steam

Abstract

The invention relates to a lignite-drying and quality-improving process for preparing superheated steam from waste heat steam. The process comprises the following operation steps of: firstly, providing a heat source for a heat energy device for preparing the superheated steam from the waste heat steam by using high-temperature flue gas produced by a hot-blast stove; secondly, recycling, purifyingand refining waste heat steam produced by a normally-running energy-saving cylindrical lignite-drying and quality-improving device; thirdly, preparing high-temperature superheated steam by using the heat energy device for preparing the superheated steam from the waste heat steam; fourthly, drying wet-based lignite and improving quality by using the energy-saving cylindrical lignite-drying and quality-improving device; and finally, recycling the waste heat steam produced in a drying process by the recycling, purifying and refining steps. The process uses the waste heat steam to dry the ligniteand has the characteristics of reasonable design and simple, convenient and smooth route. The device has the characteristics of optimized design, compact structure, small floor area, a small amount of investment, low running cost, high yield, large dehydrating range, safe running, energy conservation, capability of saving power, lowering consumption and reducing emission, wide application range of quality-improved lignite and the like.

Description

technical field [0001] The invention provides a drying and upgrading process for low calorific value fuels, especially a lignite drying and upgrading process using waste heat gas to prepare superheated steam, which is not only suitable for drying and upgrading lignite and other low calorific value fuel resources, It is also suitable for drying and upgrading low-viscosity materials of different shapes and properties in food processing industry, meat processing industry, pharmaceutical industry, industry, agriculture, light industry, chemical industry, aquatic product processing industry and military industry. All kinds of drying machinery and equipment for body resources. Background technique [0002] my country has abundant reserves of lignite resources, but high-quality coal resources such as bituminous coal and anthracite are scarce. High-moisture moisture-based lignite can only be widely used after drying and upgrading. For this reason, enterprises such as domestic coal ...

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Problems solved by technology

[0004] The object of the present invention is to provide a lignite drying and upgrading process using waste heat gas to prepare superheated steam, which effectively solves the problem of drying low-grade low-calorific value fuel resources and adopts superheated steam produced by high-calorific value fuel and high-pressure container boilers as an uneconomical heat source It solves the problem of using high-temperature flue gas as a heat source, although it is economical, but there are fire or explosion hazards

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