Open lower temperature waste heat utilization system of ultra-clean emission coal-fired unit

Abstract

The invention discloses an open lower temperature waste heat utilization system of ultra-clean emission coal-fired unit, and relates to a steady controllable open MGGH system. A water outlet of a gas cooler is communicated with a gas-gas heater and a water inlet of waste heat recovery hot water mixer through pipeline systems with valves respectively, and the water inlet pipeline of the gas-gas heater is also provided with an auxiliary steam heater; the water outlet of the gas-gas heater is communicated with the water inlet of the gas cooler through a circulating water and make-up water mixer, a variable frequency booster pump and the pipeline systems with the valves; the water inlet of the circulating water and make-up water mixer is also communicated with a condensation water pipeline, and the water outlet of the waste heat recovery hot water mixer is communicated with a low-temperature heating system pipeline through at least two pipelines with the valves. In the invention, the problems that the inlet gas temperature of an electrostatic precipitator and chimney inlet gas temperature are difficult to control, the low-temperature heating adjustment of the unit is difficult to control and the disturbance is severe due to poor heat exchange effect of a plate heat exchanger in the existing MGGH technology are solved.

Description

technical field [0001] The invention relates to an open MGGH system that can be stably adjusted, and belongs to the technical field of low-temperature waste heat utilization of ultra-clean emission coal-fired units. Background technique [0002] Following the implementation of GB 13223-2011 "Emission Standards of Atmospheric Pollutants for Thermal Power Plants" and GB3095-2012 "Ambient Air Quality Standards", the state has promulgated the "Coal Power Energy Conservation and Emission Reduction Upgrading and Transformation Action Plan (2014-2020)", showing that This has confirmed the government's determination to control the pollution emissions of coal-fired units, and the implementation of this series of policies and standards has put forward higher requirements for the pollution control technology of coal-fired units. [0003] At present, the wet flue gas desulfurization process of coal-fired power plants in my country generally has an inlet flue temperature of 120-150°C and...

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Problems solved by technology

[0006] The purpose of the present invention is to solve the problem that the comprehensive environmental protection process route of domestic thermal power units is still relatively simple, and the simple dust removal and desulfurization process route can no longer meet the requirements of future environmental protection standards development and changes, and can not achieve the comprehensive effect of energy saving and emission reduction. The existing MGGH technology has problems such as difficulty in controlling the smoke temperature at the inlet of the electrostatic precipitator and the smoke temperature at the inlet of the chimney, and insufficient heat transfer effect of the plate heat exchanger, which causes difficulty in adjusting and controlling the unit's low load and large disturbances.

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