Heat-compensated superheated steam coal upgrading system with temperature difference power generation

Abstract

The invention belongs to the technical field of superheated steam coal upgrading for semiconductor temperature difference power generation, in particular to a thermal compensation type superheated steam coal upgrading system for power generation with temperature difference. After the raw coal is crushed and screened by the coal crusher, it enters the superheated steam fluidized bed through the coal bunker, flows out from the bottom of the fluidized bed after heat and mass transfer occurs, and becomes upgraded coal after passing through the coal cooler; the superheated steam source comes from electric superheating The steam generator and superheated steam extract air, and the heat source of waste heat exchanger and solar heat exchanger performs thermal compensation for the production of superheated steam; the moisture contained in raw coal is heated and evaporated in the fluidized bed, and mixed with superheated steam into two Secondary steam, after passing through the circulating fan, enters the secondary steam heat exchanger tube group, heat exchange with the raw coal again, and condenses into precipitated water; the flue gas and sewage waste heat source, solar heat source and circulating superheated steam are used as high-temperature power for thermoelectric power generation The side heat source, the cooling water and the precipitated water after passing through the buried pipe group in the coal bunker are used as the low-temperature side cold source for thermoelectric power generation.

Description

technical field [0001] The invention belongs to the technical field of superheated steam coal upgrading for semiconductor temperature difference power generation, in particular to a thermal compensation type superheated steam coal upgrading system for power generation with temperature difference. Background technique [0002] Superheated steam coal upgrading is a clean coal utilization technology. After the raw coal particles are crushed, screened and distributed, they are directly and indirectly contacted with superheated steam to exchange heat. After the secondary steam cycle condenses, the moisture contained in the coal is condensed and precipitated, so that the coal removes moisture and a part of ash, so that the coal quality is effectively improved. Using superheated steam as the heat transfer medium, using the secondary steam cycle to make full use of the latent heat of superheated steam, with low energy consumption, high thermal efficiency, no dust pollution, preventi...

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Problems solved by technology

In the existing technology, the actual energy consumption is about 800kJ / kg.H because the superheated steam and the secondary steam cannot be intelligently matched. 2 O or above, although the energy consumption of flue gas and hot air as a medium has a technical comparative advantage, it does not reflect the energy consumption advantages of superheated steam coal upgrading technology, the improvement of coal quality treatment properties, and the effects of combustion optimization.

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