The invention relates to a post-desulphurization
flue gas
moisture content determination method and apparatus. The apparatus comprises a sampling tube, a heat tracing ventilation
pipe, a gas suction pump, a flow regulating valve, a flow meter, a three-way valve, a temperature
measuring instrument, a pressure
measuring instrument, and a Karl Fischer titrator, which are connected sequentially. The determination method comprises the steps that: (1) 100ml of
anhydrous methanol is added into a
titration cup, and the titrator is reset to a
system blank value. (2) standard water is accurately measured, and is injected into the
titration cup; and the concentration of a Karl Fischer
reagent is measured by using the titrator; (3) the pipeline is washed by using
flue gas for 10-15min; (4) a
flue gas flow rate is controlled at 50-100mL / min, and a ventilation time is 2-5min; and
titration is carried out by using the titrator; and (5) with the titrator, the post-desulphurization
flue gas moisture content is automatically calculated. According to the post-desulphurization
flue gas moisture content determination apparatus provided by the invention, a Karl Fischer titration method is used in
flue gas moisture
content determination, the analysis operation is simple and fast, and analysis result is accurate and reliable. Therefore, an instant and accurate basis can be provided for production operation adjustment and data calculation.