Process Gas Injection Device With Passive Furnace Heat Exchange
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Solution Overview
Problem
Existing apparatuses and processes for calcining battery cathode materials suffer from inefficient heat transfer and gas mixing, leading to incomplete reactions and increased wear on furnace components due to temperature fluctuations.
Innovation Solution
An injection device with a heat exchanger that utilizes the existing process space atmosphere to efficiently heat the process gas, featuring a meandering flow path and core structures to enhance heat transfer, allowing for passive and energy-efficient heat transfer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If the process gas is actively heated by heating units before being conveyed to the material, then the process gas temperature can be maintained, but energy consumption increases and the system becomes more complex
Solution Approach 1:
The process gas heats itself by passing through the heat exchanger that is thermally coupled to the furnace interior. The heat exchanger utilizes the thermal energy already present in the furnace to preheat the incoming process gas, eliminating the need for external active heating units and reducing energy consumption.
Solution Approach 2:
The heat exchanger acts as an intermediary between the hot furnace interior and the cooler incoming process gas. It transfers thermal energy from the furnace atmosphere to the process gas through its walls, enabling passive heating without direct contact between the hot and cold gas streams.
2Temperature
If the process gas is heated actively by heating units, then temperature control is achieved, but the device complexity and cost of insulation increase
Solution Approach 1:
The system uses the furnace's own thermal energy to heat the process gas, making the heating function self-contained and eliminating the need for external heating units, control systems, and associated insulation infrastructure.
Solution Approach 2:
The heat exchanger serves as a mediator that enables thermal energy transfer from the furnace interior to the process gas conduit, simplifying the overall system by replacing complex active heating mechanisms with a passive thermal coupling structure.
3Loss of energy
If the process gas temperature is lower than the process space atmosphere temperature, then energy saving is achieved, but incomplete reactions occur and thermal stresses increase
Solution Approach 1:
The process gas is preheated in the heat exchanger before entering the furnace atmosphere. This preliminary heating action ensures that the gas reaches an adequate temperature for complete reactions and minimizes thermal shocks to furnace components, while still maintaining overall energy efficiency by utilizing waste heat.
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 solution enables improved heat transfer efficiency, ensuring the process gas is adequately heated before reaching the material, reducing the risk of incomplete reactions and minimizing thermal stresses on furnace components.
Implementation Method 1
the heat exchanger having a heat exchanger housing which is accessible to an ambient atmosphere from the outside and in which a channel arrangement is accommodated
Implementation Method 2
optimally transfer heat present in the process space passively and in an energy-efficient manner to the gas/process gas
Data Source
AI summary
Injection device (56) for discharging a gas (54), in particular a process gas (54), onto a material (12), in particular onto a battery cathode material (14) that is to be calcined, having at least one inlet (58) through which the gas (54) can be supplied to the injection device (56), and at least one outlet (60) through which the gas (54) can be discharged from the injection device (56), the inlet and outlet being connected to one another by a flow path (62) for the gas (54). According to the invention, the flow path (62) has a heat exchanger (64) with a heat exchanger housing (68) which is accessible from the outside for an ambient atmosphere (66) and in which a duct arrangement (70) is integrated. The duct arrangement (70) comprises a first flow duct (72.1) and a second flow duct (72.2) between which there is formed a redirection region (74.1) such that the gas (54) can flow through the first and second flow duct (72.1, 72.2) in different main flow directions. The invention further relates to a process gas system (52) for supplying a gas (54) and to a device (10) and a method for the thermal or thermo-chemical treatment of material.