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A device and method for generating electricity using igcc low-grade waste heat

A waste heat power generation, low-grade technology, applied in steam generation methods using pressure combustion, steam engine devices, steam superheating, etc., can solve the problems of low-grade heat that is difficult to use up, energy waste, etc., to reduce coal consumption, reduce water consumption, The effect of improving power generation efficiency

Active Publication Date: 2018-07-10
HUANENG TIANJIN COAL GASIFICATION POWER CO LTD
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  • Abstract
  • Description
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AI Technical Summary

Problems solved by technology

Usually the heat is used to preheat the fuel gas at the inlet of the gas turbine or the condensed water in the bottom cycle of the steam preheating. However, due to the large amount of low-grade heat in IGCC, it is difficult to use up the low-grade heat
These low-grade heat are taken away by the cooling water and released to the environment by the cooling tower, resulting in a large waste of energy

Method used

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  • A device and method for generating electricity using igcc low-grade waste heat

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Embodiment

[0017] Such as figure 1 As shown, the present invention utilizes the method for generating electricity with low-grade waste heat of IGCC. After the raw coal is processed into pulverized coal in the coal processing equipment 1, it is transported to the gasifier 2; the pure oxygen produced by the air separation system 3 and another steam are used as The oxidant and reaction medium of the gasification furnace 2 enter the gasification furnace 2; the synthesis gas produced by the gasification furnace 2 enters the waste heat boiler 4, and the slag produced by the gasification furnace 2 is discharged; after the synthesis gas releases high-temperature sensible heat in the waste heat boiler 4, Enter the gas-gas heat exchanger 5, and the high-pressure steam generated by the waste heat boiler 4 enters the waste heat boiler 12 for superheating; the syngas cools down in the gas-gas heat exchanger 5 and releases heat to the fuel gas, and then enters the washing and dust removal equipment 6; ...

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Abstract

The invention discloses a device and method for achieving low-grade cogeneration by means of an IGCC. The method comprises the steps that saturated synthesis gas is adopted as a heat source for heating a pressurized organic working medium into the superheated steam state from the liquid state, expansion working electricity generation is performed inside an expansion machine, then, the organic working medium enters a condenser to become liquid, and the liquid organic working medium is boosted through a pump, so that an organic working medium Rankine cycle is formed. The device and method are used for reducing heat losses inside a gasification island cooling tower, and the system electricity generation efficiency is improved by means of low temperature exhaust heat in a gasification island.

Description

technical field [0001] The invention belongs to the field of advanced energy technologies, and in particular relates to a device and method for generating electricity by using IGCC low-grade waste heat. Background technique [0002] Integrated Gasification Combined Cycle (IGCC) is an advanced power generation system that combines clean coal gasification technology and efficient gas-steam combined cycle. It has high power generation efficiency and excellent environmental performance. IGCC implements CO 2 The energy consumption loss after capture is lower than that of conventional coal-fired power generation technology. IGCC consists of two parts, namely the coal gasification part and the gas-steam combined cycle part. The main equipment of the coal gasification part includes gasifier, air separation system, gas purification equipment, CO 2 Capture devices, etc.; the main equipment of the gas-steam combined cycle part includes gas turbines, waste heat boilers, steam turbines...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F01K27/02F01D15/10F22B1/22F22G1/16
CPCY02E20/16Y02E20/18Y02P80/15
Inventor 周贤彭烁王保民李明亮
Owner HUANENG TIANJIN COAL GASIFICATION POWER CO LTD
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