Ozone Decomposition Unit for Rotary Electric Machine Cooling
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Solution Overview
Problem
Existing methods for reducing ozone and nitric acid concentrations in the cooling air of rotary electric machines increase pressure loss and require frequent replacement or regeneration of adsorbents, leading to suboptimal cooling performance and operational efficiency.
Innovation Solution
Incorporating an ozone decomposition unit with a catalyst in the circulating airflow path to decompose ozone, thereby reducing nitric acid production and maintaining effective cooling performance without increasing pressure loss.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If activated carbon and chemical adsorbent are used to remove ozone and nitric acid separately, then concentrations of ozone and nitric acid gas are reduced, but pressure loss in the circulating airflow path increases and cooling performance decreases
Solution Approach 1:
The patent combines the functions of ozone removal and nitric acid removal into a single integrated adsorption device. The adsorption tower contains both activated carbon (for ozone removal) and chemical adsorbent (for nitric acid removal) arranged in sequence, allowing both harmful gases to be removed simultaneously without requiring separate devices, thereby avoiding the cumulative pressure loss that would result from multiple separate removal systems.
Solution Approach 2:
The adsorption tower is designed as a multi-functional device that performs both ozone adsorption and nitric acid adsorption within a single structure. By incorporating multiple adsorbents with different functions into one tower, the system achieves universal removal capability for various harmful gases (ozone, nitric acid, and their mixed forms) while maintaining a single airflow path, thus preventing excessive pressure loss.
2Object-affected harmful factors
If chemical adsorbent is used to adsorb and remove nitric acid, then nitric acid concentration is reduced, but performance is lowered in a relatively short period of time requiring frequent replacement or regeneration
Solution Approach 1:
The patent positions the activated carbon layer upstream (before) the chemical adsorbent layer in the airflow path. The activated carbon first adsorbs ozone and prevents it from reaching the chemical adsorbent, thereby preventing the formation of nitric acid from the reaction between ozone and nitrogen dioxide. This preliminary protection extends the service life of the chemical adsorbent by reducing its degradation from ozone exposure and nitric acid formation.
Solution Approach 2:
The patent utilizes the chemical adsorbent's ability to adsorb both nitric acid and ozone, but more importantly, it benefits from the activated carbon's ozone removal function which prevents harmful side reactions. The combination transforms the potential harm of ozone (which degrades adsorbents) into a benefit by removing it beforehand, thereby extending the operational duration of the adsorption system.
3Object-affected harmful factors
If multiple stages of adsorption tower and catalyst tower are disposed in series, then nitric acid and ozone are removed, but pressure loss is increased
Solution Approach 1:
The patent merges the functions of multiple separate towers (adsorption tower and catalyst tower) into a single integrated adsorption tower. By combining multiple removal stages into one unified structure with sequentially arranged adsorbents, the system achieves the same harmful gas removal effectiveness while maintaining a single airflow path, thereby avoiding the cumulative pressure loss that would result from multiple separate towers in series.
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 ozone decomposition unit effectively reduces ozone and nitric acid concentrations over a long period, preventing corrosion and maintaining continuous operation without the need for frequent adsorbent replacement or regeneration.
Implementation Method 1
a circulating airflow path 4 in which cooling air circulates; an ozone decomposition unit 7 disposed in the circulating airflow path 4, the ozone decomposition unit 7 having an ozone decomposition catalyst
Implementation Method 2
decompose ozone and to suppress production of nitric acid
Data Source
AI summary
The present invention provides a method for reducing concentrations of ozone and nitric acid produced in cooling air flowing through a circulating airflow path of a rotary electric machine, the method including: disposing an ozone decomposition unit containing an ozone decomposition catalyst in the circulating airflow path; and allowing the cooling air to pass through the ozone decomposition unit so as to decompose ozone and to suppress production of nitric acid. According to the present invention, the method and device are capable of reducing the concentrations of ozone and nitric acid produced in the cooling air flowing through the circulating airflow path of the rotary electric machine for a long period of time while preventing pressure loss.