Enclosed Cement Plant Assemblies Preventing Nitrous Gas Formation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In modern cement clinker production plants using the oxy-fuel method, infiltrated atmospheric air can enter the plant, leading to the formation of nitrous gases and increased compression work, especially in retrofitted plants without measures to prevent nitrous gases.
Innovation Solution
The method involves enclosing plant assemblies with a second shell to create a negative pressure environment using compressed process gas, ensuring that any infiltrated air is composed of the process gas itself, thereby preventing the formation of nitrous gases.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-generated harmful factors
If the oxy-fuel method is used to replace nitrogen-containing carrier air with carbon dioxide, then nitrous gases are eliminated and compression work is reduced, but infiltrated atmospheric air can enter the plant and form nitrous gases again
Solution Approach 1:
The patent applies the inert atmosphere principle by creating a protected environment within the plant using process gas (carbon dioxide-rich atmosphere) that prevents atmospheric air from entering and reacting to form nitrous gases. The enclosure maintains a nitrogen-free atmosphere that inhibits the formation of harmful nitrous gases while allowing the oxy-fuel method to function effectively.
Solution Approach 2:
The patent uses process gas as an intermediary substance that fills the space between the plant components and the external atmosphere. This intermediary process gas prevents direct contact between atmospheric air and the plant interior, thereby preventing the formation of nitrous gases while maintaining the efficiency of the oxy-fuel process.
2Productivity
If high gas flow velocities are used in the plant, then productivity is improved, but infiltrated atmospheric air is sucked in leading to increased compression work
Solution Approach 1:
The patent creates an inert atmosphere using process gas that prevents atmospheric air from being drawn in even when high gas flow velocities create negative pressure. This ensures that only process gas is present in the plant, eliminating the need for additional compression work to handle infiltrated air while maintaining high productivity.
3Reliability
If plant assemblies are enclosed with a second shell, then infiltrated air is prevented from entering, but device complexity increases
Solution Approach 1:
The patent applies the nested doll principle by placing a second shell (enclosure) around existing plant assemblies. This nested structure creates a protected atmosphere within the existing equipment without requiring complete redesign, thereby preventing infiltrated air entry while minimizing the increase in device complexity.
Solution Approach 2:
The enclosure structure serves multiple functions: it prevents infiltrated air from entering, maintains the inert atmosphere, and can be integrated with existing plant assemblies. This multi-functionality reduces the need for additional separate systems, thereby limiting the increase in device complexity while achieving reliable prevention of air infiltration.
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 effectively prevents the inflow of atmospheric air into the plant, reducing the formation of nitrous gases and minimizing compression work, thereby enhancing the operational efficiency and environmental sustainability of cement clinker production plants.
Implementation Method 1
process gas is applied to the enclosure in the form of a shell via a compressor
Implementation Method 2
the plant assembly has a second shell with respect to the atmosphere, and wherein process gas is applied to the enclosure in the form of a shell via a compressor
Data Source
AI summary
A method for operating a plant for producing cement clinker, wherein the plant comprises as plant units, in the direction of gas flow, at least one clinker cooler, at least one rotary kiln, at least one calciner, at least one heat-exchanger line including heat-exchanger cyclones, and at least one device for crushing raw meal and/or cement clinker, and also a corresponding plant for producing cement clinker. At least one plant unit is enclosed, whereby the plant unit is provided with a second covering with respect to the atmosphere, and the enclosure is subjected to process gas from a compressor.