Ammonia Waste Fluid Neutralization System With pH-Based Dosing

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Solution Overview

Problem

The challenge of efficiently neutralizing ammonia-containing waste fluids, particularly from lubricating oils in engines using liquid ammonia fuel, due to limited installation space in ships and land power plants, leading to corrosion and disposal issues.

Innovation Solution

A neutralization processing system comprising a sludge tank, neutralizer supply line, and pH/ammonia concentration sensor, along with a neutralizer addition based on measured values, to efficiently neutralize ammonia-containing waste fluids.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If a recovery tank is used to store ammonia-containing waste fluid, then the waste fluid can be recovered and neutralized, but the installation space requirement increases

Engineering Contradiction:
Improvewaste fluid recovery capabilityVSAvoidinstallation space
Core Design Contradiction:
ReliabilityVSVolume of stationary object

Solution Approach 1:

The invention combines the waste fluid tank and sludge tank into a single integrated tank structure. The waste fluid tank is positioned above the sludge tank, with the sludge discharge line extending from the bottom of the waste fluid tank into the sludge tank below. This vertical integration allows both functions to coexist in a compact footprint, significantly reducing the installation space required while maintaining the ability to recover and neutralize ammonia-containing waste fluid.

Inventive Principle:
Principle #5Merging (Combining)

2Object-affected harmful factors

If ammonia-containing waste fluid is not neutralized, then material corrosion occurs, but neutralization requires additional processing equipment and space

Engineering Contradiction:
Improvematerial corrosionVSAvoidprocessing equipment
Core Design Contradiction:
Object-affected harmful factorsVSDevice complexity

Solution Approach 1:

The system enables self-service neutralization by equipping the sludge tank with pH sensors and automated neutralizer injection capabilities. The sensor continuously monitors the pH level of the waste fluid, and when corrosion risk is detected (pH outside safe range), the system automatically adds neutralizing agents to adjust the pH. This automated self-regulation eliminates the need for complex external processing equipment while effectively preventing material corrosion.

Inventive Principle:
Principle #25Self-service

Solution Approach 2:

The invention implements a feedback control mechanism where pH sensors monitor the chemical properties of the waste fluid in real-time. The sensor data is fed back to the control system, which automatically adjusts neutralizer dosage to maintain pH within safe operating ranges. This closed-loop feedback system ensures corrosion prevention through continuous monitoring and automatic correction without requiring complex manual intervention or additional processing equipment.

Inventive Principle:
Principle #23Feedback

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

The system effectively neutralizes ammonia-containing waste fluids by using sensors to measure pH and ammonia concentration, allowing precise neutralizer addition, thereby reducing corrosion and facilitating safe disposal.

Implementation Method 1

a sensor configured to measure pH of the waste fluid or an ammonia concentration of the waste fluid

Methodology Applied
Scientific EffectpH measurement:

Implementation Method 2

neutralizing the waste fluid by adding a neutralizer to the waste fluid

Methodology Applied
Scientific EffectNeutralization reaction: Chemical Bonding

Data Source

PatentUS12441639B2Neutralization processing system for ammonia-containing waste fluid and neutralization processing method for ammonia-containing waste fluid
Publication Date: 2025.10.14 MITSUBISHI KAKOKI KAISHA LTD
  • US12441639B2 patent drawing
  • US12441639B2 patent drawing
  • US12441639B2 patent drawing

AI summary

A neutralization processing system for an ammonia-containing waste fluid, includes: one or more sludge tanks; a sludge discharge line configured to supply the waste fluid to the sludge tank; a neutralizer supply line configured to supply a neutralizer to the sludge tank; and a sensor configured to measure pH of the waste fluid or an ammonia concentration of the waste fluid.