Ammonia Mixed-Combustion Engine Exhaust Composition Control
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Solution Overview
Problem
Conventional ammonia mixed combustion engines face challenges in controlling the amount and ratio of nitrogen oxides and ammonia in exhaust gases, leading to increased device size and greenhouse gas emissions, and poor exhaust gas properties.
Innovation Solution
An engine device that controls the air excess ratio and injection timing of a hydrocarbon-based auxiliary fuel to achieve a predetermined proportion of unburned ammonia and nitrogen oxides in the exhaust gas, using a selective reduction catalyst and ammonia adsorption catalyst to purify the exhaust.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If the amount of ammonia supplied to the ammonia mixed combustion engine is reduced, then the exhaust gas properties are improved, but the output decreases and requires inputting another fuel which increases greenhouse gas emissions
Solution Approach 1:
The invention changes the air excess ratio parameter to control the combustion process, achieving a state where unburned ammonia and nitrogen oxides are produced in a predetermined proportion that optimizes both exhaust gas properties and engine output without requiring additional fuels
2Object-affected harmful factors
If a device is constructed to purify exhaust gas based on the estimated maximum value of nitrogen oxides and unburned ammonia, then the exhaust gas purification is ensured, but the capacity and size of the device increases
Solution Approach 1:
The invention uses feedback control by detecting the actual proportion of unburned ammonia and nitrogen oxides in the exhaust gas and adjusting the air excess ratio accordingly, allowing for a more compact purification device since the proportions are controlled to match design specifications rather than requiring maximum capacity for worst-case scenarios
Solution Approach 2:
By controlling the air excess ratio to achieve a predetermined proportion of unburned ammonia and nitrogen oxides, the invention optimizes the exhaust gas composition to match the purification device's design parameters, avoiding the need for oversized equipment
3Reliability
If ammonia is mixed and burned with hydrogen to improve incombustibility, then the combustion performance is improved, but the exhaust gas properties deteriorate and require purification
Solution Approach 1:
The invention changes the approach by controlling the air excess ratio and injection timing parameters to achieve optimal combustion of ammonia-hydrogen mixtures, producing exhaust gas with a predetermined proportion of unburned ammonia and nitrogen oxides that can be effectively purified
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
Maintains good exhaust gas properties without increasing device size, reduces greenhouse gas emissions, and effectively purifies exhaust gases by regulating the proportion of unburned ammonia and nitrogen oxides.
Implementation Method 1
a catalyst having a function to reduce nitrogen oxides
Implementation Method 2
an adsorption material which is arranged on the lower stream side of the catalyst and adsorbs ammonia in the exhaust gas
Implementation Method 3
an ammonia cracker device which contains an ammonia cracker catalyst cracking ammonia and cracks ammonia to create hydrogen
Data Source
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AI summary
[Problem] Provided is an engine device in which good exhaust gas properties can be maintained without an increase in size of a device for purifying an exhaust gas exhausted from an ammonia mixed combustion engine. [Solution] An engine device 1 which is an ammonia mixed combustion engine operated by a main fuel containing ammonia and a hydrocarbon-based auxiliary fuel being combusted controls, by a control device 9, at least one of an air excess ratio of an air-fuel mixture of the main fuel and air and an injection timing of the auxiliary fuel so that a proportion of exhausted unburned ammonia and nitrogen oxides contained in an exhaust gas achieves a predetermined proportion.