Exhaust Gas Scrubber Alkaline Dosing Control
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Solution Overview
Problem
Existing exhaust gas treatment devices for removing sulfur dioxide (SO2) from fossil fuel-based engines and boilers consume excessive energy due to the large amount of dilution seawater required for waste water treatment, particularly in ships and vessels where energy is limited.
Innovation Solution
An exhaust gas treatment device with measurement sections to monitor flow rates and SO2 concentrations, and a control section that calculates and optimally supplies alkaline substances to the waste water, reducing the amount of dilution seawater needed and minimizing energy consumption by controlling the pH of the treated water for efficient discharge.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a large amount of dilution seawater is used for waste water treatment, then the pH of waste water increases and discharge quality improves, but the energy consumed by the seawater pump becomes large
Solution Approach 1:
The invention changes the chemical parameters of the waste water by adding alkaline substances (such as seawater, sodium hydroxide solution, magnesium hydroxide slurry, calcium hydroxide slurry, or calcium carbonate slurry) to neutralize the acidic waste water. This chemical parameter change allows for effective pH adjustment without requiring large amounts of dilution seawater, thereby reducing the energy consumption of the seawater pump while still achieving discharge quality standards.
2Use of energy by moving object
If measurement sections and control sections are added to optimize alkaline substance supply, then energy consumption and treatment efficiency improve, but device complexity increases
Solution Approach 1:
The invention incorporates measurement sections that monitor waste water properties (such as pH, flow rate, or sulfur dioxide content) and feeds this information back to the control section. The control section automatically adjusts the supply of alkaline substances based on the measured parameters, optimizing the treatment process. This feedback mechanism improves energy efficiency and treatment effectiveness while maintaining relatively simple device complexity through automated control.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach reduces energy consumption for waste water treatment and minimizes the amount of waste water treated, while ensuring the treated water meets quality standards for sea release, thereby conserving energy and optimizing treatment processes.
Implementation Method 1
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 and for discharging SO2-absorbed cleaning seawater as waste water
Implementation Method 2
a first measurement section configured to measure a flow rate of the exhaust gas before the exhaust gas is charged into the scrubber; a second measurement section configured to measure a concentration of SO2 of the exhaust gas before the exhaust gas is charged into the scrubber; a third measurement section configured to measure a concentration of SO2 of the purified gas
Implementation Method 3
a control section configured to calculate an amount of HSO3- ions based on measurement values of the first to third measurement sections and to control a supply of an alkaline substance, in accordance with the calculated amount of HSO3- ions
Data Source
Figure 1
Figure 2~3
Figure 4
AI summary
In order to reduce energy consumed for waste water treatment, in a scrubber (10), an exhaust gas (g1) is purified into a purified gas (g2) by bringing SO2 contained in the exhaust gas (g1) into contact with cleaning seawater (a1) and SO2-absorbed cleaning seawater is discharged as waste water (a2). 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 (a3) in accordance with this calculation result is supplied to the waste water.