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US 2017/0001143 A1Published application
Exhaust gas treatment device and waste water treatment method for exhaust gas treatment device
AssigneeFuji Electric Co., Ltd.
InventorHiroyuki TOUYAMA
Life of this patent
Estimating the term…
Abstract
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.
Claims15
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.
3 more elements
A waste water treatment method for an exhaust gas treatment device, comprising:
- purifying an exhaust gas charged in a scrubber into a purified gas by bringing SO2 contained in the exhaust gas into contact with cleaning seawater so that the cleaning seawater absorbs SO2 from the exhaust gas;
- discharging the SO2-absorbed cleaning seawater as waste water;
- measuring a flow rate and a concentration of SO2 of the exhaust gas before the exhaust gas is charged into the scrubber, a concentration of SO2 of the purified gas, and a flow rate of the cleaning seawater to be supplied to the scrubber;
- calculating an amount of HSO3− of the waste water based on measurement values used in said measuring to thereby obtain a calculation result;
- and
- supplying an amount of alkaline substance in accordance with the calculation result to the waste water.
3 more elements
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 so that the cleaning seawater absorbs SO2 from the exhaust gas, and 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 the cleaning seawater, in accordance with the calculation result, to the scrubber.
3 more elements
A waste water treatment method for an exhaust gas treatment device, comprising:
- purifying an exhaust gas charged in a scrubber into a purified gas by bringing SO2 contained in the exhaust gas into contact with cleaning seawater so that the cleaning seawater absorbs SO2 from the exhaust gas;
- discharging the SO2-absorbed cleaning seawater as waste water;
- measuring a flow rate and a concentration of SO2 of the exhaust gas before the exhaust gas is charged into the scrubber, a concentration of SO2 of the purified gas, and a flow rate of the cleaning seawater to be supplied to the scrubber;
- calculating a desulfurization rate based on measurement values in said measuring to thereby obtain a first calculation result;
- supplying a flow rate of cleaning seawater, in accordance with the first calculation result, to the scrubber;
- calculating an amount of HSO3− of the waste water based on measurement values in said measuring to thereby obtain a second calculation result;
- and
- supplying an amount of alkaline substance, in accordance with the second calculation result, to the waste water.
5 more elements
Dependencies are inferred from the claim text.