Control accuracy
Exothermic reactions need fast response, typically ±1–3 °C, which depends on PID tuning and sensible splitting of heating power.
DIANREZHANELECTRIC HEATINGIndustry Solutions中文INDUSTRY SOLUTION · S4
Thermal oil heat,
to the duty.
Indirect heating and constant control through a thermal-oil loop. Fix the temperature band, circulation rate and heat consumers.
- Reactor volume and jacket type
- Target temperature band
- Heating / cooling rate requirement
- Thermal oil circulation rate
- Number and layout of heat consumers
- Cooling method
SCENARIO
Typical duty
Read the process, then the equipment
Synthesis, resin, rubber calendering and composite moulding hold reactor jackets, rolls or moulds at a constant 150–350 °C. Direct element heating easily creates hot spots, so a thermal-oil loop transfers heat indirectly for even control, with a cooling changeover to cover exothermic reactions.
System pressure
Hot oil generates vapour pressure and thermal expansion, so expansion-tank volume, venting and relief design must be calculated.
Oil ageing
Local overheating accelerates coking and ageing of the heat-transfer oil; keep surface load and velocity in range and test the oil periodically.
Splitting several consumers
One heater serving several reactors or rolls needs separate oil branches with individual control valves so the circuits do not disturb each other.
SOLUTION PATH
From duty to equipment,
four steps
- 01
Fix the band and duty
Establish reactor volume, jacket heat-transfer area, target band and ramp-rate requirement, then calculate heating and cooling power.
- 02
Set circulation parameters
Derive oil flow and pump arrangement from heat duty and temperature difference, checking line resistance and velocity.
- 03
Build the control system
Staged heating plus continuous PID; where cooling is required add cold-oil substitution or a cooler so the system switches automatically between heating and cooling.
- 04
Safety accessories
Expansion tank, storage tank, over-temperature protection, pressure monitoring and low-level alarm, meeting fire and discharge requirements.
RECOMMENDED EQUIPMENT
Equipment directions
FAQ
Common questions
01What is the highest stable temperature?+
Common thermal-oil systems run steadily around 300 °C. Higher bands need synthetic heat-transfer oil and a pressure check of the system, governed by the oil’s permitted service temperature.
02The reaction is exothermic and needs cooling — how?+
The design can include a cold-oil substitution circuit or a plate cooler, with the controller switching automatically between heating and cooling on temperature deviation to hold the set point.
03How big should the expansion tank be?+
Expansion-tank volume depends on total oil charge and temperature rise; it is generally sized at 1.5–2 times the oil expansion with a safety reserve, finalised at design stage.
INQUIRY PREP
Come prepared,
decide faster on Reactor Oil Control
Have these parameters ready — they feed directly into model selection, power sizing and mechanical design review.- Reactor volume and jacket type
- Target temperature band
- Heating / cooling rate requirement
- Thermal oil circulation rate
- Number and layout of heat consumers
- Cooling method
Other solutions
S1Chemical & process pipeline heatingHeat-up, trace heating and temperature holding for process media. Fix medium, pressure, corrosivity and Ex requirements first.S2Waste gas & VOC treatment heatingWaste-gas pre-heating and duct boosting before catalytic oxidation. Fix air volume, rise, pressure drop and fan interlocks.S3Industrial drying & hot airStable hot air for drying rooms, lines and fresh-air systems. Judge velocity, temperature uniformity and staged control.S5Tank & liquid heatingLiquid heat-up through flanged immersion elements or an external loop. Watch level, scaling, material and surface load.S6Hazardous-area electric heatingHeating for flammable or explosive atmospheres: zone, Ex level, temperature class, isolation and over-temperature protection.