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What Is a Jacket Reactor? Heat Transfer & Applications
| MOQ: | 1 Sets |
| Price: | 10000 USD |
| Delivery Period: | 2 months |
| Payment Method: | L/C,T/T |
| Supply Capacity: | 200 sets / days |
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What Is a Jacket Reactor? Heat Transfer & Applications
Answering the core question: What is a jacket reactor, and how does its heat-transfer jacket govern reaction temperature? A jacket reactor is defined by the annular or coil subsystem surrounding the vessel shell that circulates heating or cooling fluid to set the wall temperature within plus or minus 0.5-2 degree C. Jacket design determines the overall coefficient U (50 W/m2K plain up to 500 W/m2K half-pipe coil) and the log-mean temperature difference (LMTD) that drives heat flux of 5-50 kW/m2. Matching fluid velocity above 1.5 m/s and turbulence keeps U high while limiting pressure drop, enabling exothermic control from minus 40 degree C glycol cooling to 350 degree C thermal-oil heating at 0.1-10 MPa.
Core Operating Principles of Jacket Reactors
- LMTD and Heat Flux: Q = U times A times LMTD; a 20 degree C LMTD with U=300 W/m2K yields 6 kW/m2, sizing jackets for 50-200 kW per m3 batch.
- Fluid Velocity and Turbulence: Velocity above 1.5 m/s in half-pipe coils induces turbulent film (Re above 10,000), lifting U and reducing fouling versus laminar flow.
- Cascade Temperature Control: Jacket supply/return sensors modulate a control valve on the thermal-fluid skid to hold reactor setpoint within plus or minus 0.5 degree C.
Major Jacket Configurations
- Dimple Jacket: Laser-welded dimples create turbulent film at 0.3-1.0 MPa; economical for 0.5-20 m3 tanks.
- Half-Pipe Coil: 180 degree pipe sections at 2-6 MPa; highest U (300-500 W/m2K) for severe exotherms.
- Limpet or External Coil: Twin serpentine coils on large 50-200 m3 reactors where full jacketing is structurally costly.
Jacket Reactor Configurations Comparison Matrix
| Jacket Config. | Coolant Pressure | U Range | Best Duty |
|---|---|---|---|
| Dimple | 0.3-1.0 MPa | 200-400 W/m2K | General 0.5-20 m3 |
| Half-Pipe | 2-6 MPa | 300-500 W/m2K | Strong exotherms |
| Limpet Coil | 1-4 MPa | 150-350 W/m2K | 50-200 m3 large |
| Plain Annular | 0.1-1.0 MPa | 50-150 W/m2K | Low-duty heating |
Frequently Asked Questions (FAQ)
Q: What is the difference between a jacket reactor and a jacketed reactor?
A: The terms overlap; a jacket reactor emphasizes the heat-transfer subsystem (coil/dimple/LMTD), while jacketed reactor refers to the whole vessel equipped with that jacket.
Q: How is heat-transfer coefficient U improved?
A: Higher fluid velocity (above 1.5 m/s) and turbulent dimples or coils raise U from 50 to 500 W/m2K, increasing removable heat per unit area.
Q: Which fluid covers the widest temperature range?
A: Thermal oil serves 200-350 degree C; water-glycol covers minus 40 to 120 degree C; steam heats to 200 degree C, so combined loops span minus 40 to 350 degree C.
Q: Why control jacket supply/return rather than just reactor temperature?
A: Dual sensing enables cascade control that anticipates load changes, holding the reactor within plus or minus 0.5 degree C even during fast exotherms.
