EXHAUST GAS TREATMENT DEVICE AND WASTE WATER TREATMENT METHOD FOR EXHAUST GAS TREATMENT DEVICE

摘要

In order to reduce energy consumed for waste water treatment, in a scrubber, an exhaust gas is purified into a purified gas by bringing SO2 contained in the exhaust gas into contact with cleaning seawater and SO2-absorbed cleaning seawater is discharged as waste water. Then, a flow rate and a concentration of SO2 of the exhaust gas and a concentration of SO2 of the purified gas are measured. These measurement values are used as a basis to calculate an amount of HSO3− obtained by being absorbed into the cleaning seawater, and an amount of dilution seawater in accordance with this calculation result is supplied to the waste water.

主权项

1. An exhaust gas treatment device comprising:
a scrubber configured to purify an exhaust gas into a purified gas by bringing SO2 contained in the exhaust gas into contact with cleaning seawater to form SO2-absorbed cleaning seawater, the scrubber further configured for discharging the SO2-absorbed cleaning seawater as waste water; a first measurer configured to measure a flow rate of the exhaust gas before the exhaust gas is charged into the scrubber to determine a first measurement value; a second measurer configured to measure a concentration of the SO2 of the exhaust gas before the exhaust gas is charged into the scrubber to determine a second measurement value; a third measurer configured to measure a concentration of SO2 of the purified gas to determine a third measurement value; and a controller configured to calculate an amount of HSO3− of the waste water based on the first, second and third measurement values of the first through third measurers to thereby obtain a calculation result, and configured to supply an amount of an alkaline substance, in accordance with the calculation result, to the waste water.