Thermal compensation type superheated steam coal upgrading system with thermoelectric power generation function

Abstract

The invention belongs to the technical field of superheated steam coal upgrading of semiconductor thermoelectric power generation, and particularly relates to a thermal compensation type superheated steam coal upgrading system with the thermoelectric power generation function. Raw coal enters the superheated steam fluidized bed through the coal bunker after being crushed and screened by the coal crusher, flows out from the bottom of the fluidized bed after heat and mass transfer, and becomes upgraded coal after passing through the coal cooler; the superheated steam source is from an electric superheated steam generator and a superheated steam exhaust, and heat sources of the waste heat exchanger and the solar heat exchanger are used for carrying out heat compensation on superheated steam production; water contained in the raw coal is heated and evaporated in the fluidized bed, is mixed with superheated steam after being sprayed through a nozzle to form secondary steam, is introduced into the secondary steam heat exchanger tube bank after passing through the circulating fan, exchanges heat with the raw coal again, and is condensed into separated water; the flue gas, the blowdown waste heat source, the solar heat source and the circulating superheated steam are used as a high-temperature side heat source for thermoelectric power generation, and the cooling water and the separatedwater passing through the buried pipe group in the coal bunker are used as a 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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