Method for smoke discharge, condensation and dust removal of supercharged oxygen-enriched coal-fired boiler

Abstract

The invention relates to a method for smoke discharge, condensation and dust removal of a supercharged oxygen-enriched coal-fired boiler. The method comprises the following steps of: introducing smoke into a high-pressure water cooling cyclone dust removal and condensation device; exchanging heat between the smoke and a water cooling wall in the device and condensing; dumping dust and liquid dropin the smoke to an inner wall of the water cooling wall; downwards flowing a liquid film formed by condensation under the action of gravity and washing the dust on an inner wall surface; condensing sulfuric acid steam in the smoke and flowing the sulfuric acid steam to the bottom part of a conical chamber arranged on the lower part of the device; discharging the treated smoke through an air outlet pipe; discharging ash gathered on the bottom part of the device through an ash discharging valve; discharging acid liquid to an acid liquid treatment and recovery device for separation of dilute sulphuric acid; sending separated water to a spraying pipe of the dust removal and condensation device; blowing the ash from the dust removal and condensation device; sending cooling water subjected to heat exchange to a water feeding heating system of the boiler. The method is characterized in that: equipment is simple and reliable, energy consumption is low, a CO2 collection process is simplified, and a good effect of smoke dehydration and dust removal can be achieved.

Description

Technical field [0001] The invention relates to a boiler flue gas condensation and dust removal method, in particular to recovering sensible heat and moisture condensation heat in low-temperature flue gas of a pressurized oxygen-enriched coal-fired boiler, removing moisture and dust, avoiding ash accumulation, and recovering dilute sulfuric acid solution And the method of self-supplied water soot blowing function belongs to the technical field of boilers. Background technique [0002] To capture CO 2 The purpose-built pressurized oxy-fuel combustion integrated power generation system enables the boiler to burn and capture CO 2 The whole process is completed under the pressure of about 6.0-8.0MPa. Under this high pressure, the moisture condensation temperature in the boiler exhaust flue gas is increased to about 200°C. Therefore, it can recover the moisture condensation heat that could not be used, heat the steam turbine condensate, reduce the loss of boiler exhaust smoke, and...

AI Technical Summary

Problems solved by technology

The traditional tube-and-tube smoke exhaust condenser, in the process of recovering the condensation heat of the flue gas moisture in the pressurized oxygen-enriched coal-fired boiler, cannot avoid ash blocking and corrosion between the tubes, which brings great confusion to the industry

Images