Komatsu Excavator Parts Evaporation Box ND446600-0990

Komatsu Excavator Parts Evaporation Box ND446600-0990

The evaporation box in an excavator is a component of the machine's emissions control system, specifically in modern diesel engines equipped with selective catalytic reduction (SCR) technology. Here's an overview:

Function of the Evaporation Box

1. DEF Storage: The primary function of the evaporation box is to store Diesel Exhaust Fluid (DEF), also known as AdBlue or urea solution.
2. Emissions Reduction: DEF is injected into the exhaust stream of diesel engines equipped with SCR systems to reduce harmful emissions of nitrogen oxides (NOx).
3. Fluid Heating: In cold weather conditions, the evaporation box may include a heating element or system to prevent DEF from freezing and ensure proper operation of the SCR system.
4. Fluid Distribution: The evaporation box contains components such as pumps, sensors, and valves to control the distribution and injection of DEF into the exhaust system.

Components of the Evaporation Box

1. DEF Tank: The main storage tank for Diesel Exhaust Fluid.
2. Heating System: Includes elements such as electric heaters or coolant lines to maintain DEF temperature and prevent freezing.
3. Pumps: Transfer DEF from the tank to the injection system.
4. Sensors: Monitor DEF level, temperature, and quality to ensure proper operation.
5. Valves: Control the flow of DEF to the injection system and regulate fluid pressure.

Operation of the Evaporation Box

1. DEF Injection: During engine operation, DEF is injected into the exhaust stream downstream of the diesel oxidation catalyst (DOC) and diesel particulate filter (DPF).
2. SCR Catalyst: In the SCR catalyst, DEF undergoes a chemical reaction with nitrogen oxides (NOx) in the exhaust gas, converting them into harmless nitrogen and water vapor.
3. Emission Compliance: By reducing NOx emissions, the SCR system helps diesel engines comply with emissions regulations, such as Tier 4 Final or Stage V standards.
4. Temperature Control: The evaporation box ensures that DEF remains at the optimal temperature range for effective catalytic conversion, even in varying environmental conditions.

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