Pillow Plate Jackets for Tanks and Reactors: Better Heating and Cooling with Less Space

Tanks and reactors are used in many industrial processes, including chemical production, food and beverage processing, fermentation, crystallization, polymerization, and solvent recovery. In these systems, temperature control is often essential for product quality, reaction rate, safety, and energy efficiency. A tank jacket or reactor jacket is one of the most common ways to heat or cool the process medium.

Traditional jacket types include conventional dimple jackets, half-pipe coils, and external coils. For many modern process systems, pillow plate jackets provide another efficient option. By using laser-welded pillow plate technology, the jacket can create a strong, compact, and high-performance heat transfer surface around the tank or reactor.

 What is a pillow plate jacket?

A pillow plate jacket is made from two metal sheets welded together in a designed pattern and expanded to form an internal flow channel. Heating or cooling medium flows through this channel, transferring heat through the tank wall or jacket surface. The inflated structure creates a pillow-like shape that improves strength and promotes turbulent flow.

Pillow plate jackets can be installed on cylindrical tanks, conical sections, flat surfaces, reactors, vessels, and customized process equipment. They can be designed for heating, cooling, temperature holding, or heat recovery duties.

Why temperature control matters in tanks and reactors

In many processes, a small temperature deviation can affect the final product. For example, reaction temperature can influence conversion rate and byproduct formation. In crystallization, cooling rate can affect crystal size and purity. In food processing, heating and cooling conditions can influence viscosity, texture, and safety. In polymer or resin processes, heat removal can be critical because the reaction may release significant heat.

Poor jacket performance can cause:

- Slow heating or cooling

- Uneven temperature distribution

- Hot spots or cold spots

- Longer batch time

- Higher energy consumption

- Fouling on the process side

- Difficulty controlling exothermic reactions

A well-designed pillow plate jacket helps improve heat transfer while keeping the system compact.

Pillow plate jackets vs conventional jackets

Heat transfer performance

The pillow-shaped channel promotes turbulence in the heating or cooling medium. This can improve heat transfer compared with simple flat jackets where flow distribution is weak. Better heat transfer can reduce heating or cooling time and support more stable process control.

Compact structure

Pillow plate jackets are usually compact and can be integrated closely with the vessel surface. This is helpful when installation space is limited or when the process equipment needs a clean external structure.

 Mechanical strength

The welded pillow structure can provide good pressure-bearing capability when designed correctly. Compared with some conventional jacket structures, pillow plate jackets can offer a strong and lightweight solution for industrial process vessels.

Customization

The flow path, welding pattern, connection position, material, plate thickness, and jacket coverage area can be customized according to the process requirement. This flexibility is important for non-standard tanks and reactors.

 Common applications

Pillow plate jackets are suitable for many heating and cooling duties, including:

- Reactor cooling for exothermic processes

- Tank heating for viscous materials

- Crystallizer cooling

- Fermentation tank temperature control

- Solvent recovery and distillation support

- Food and beverage process tanks

- Chemical storage tanks requiring temperature holding

- Polymer and resin production

They are especially useful when uniform heat transfer, compact construction, and customized design are important.

 Design points for pillow plate jackets

1. Heating or cooling duty

The first step is to calculate the heat duty required by the process. This depends on batch volume, medium properties, temperature change, time requirement, and whether heat is generated or absorbed during the process.

2. Jacket coverage area

The jacket can cover part of the tank, the full side wall, the bottom cone, or special zones. The best coverage depends on the liquid level, mixing condition, heat duty, and process control needs.

 3. Utility medium

Common utility media include water, hot water, steam, thermal oil, chilled water, glycol solution, or other heat transfer fluids. The utility side pressure, temperature, flow rate, and corrosion characteristics must be checked.

4. Material compatibility

Material selection should consider both process side and utility side conditions. Stainless steel is widely used, but special materials may be needed for corrosive or high-temperature service.

5. Cleaning and maintenance

The jacket side should be designed with proper inlet, outlet, drain, and vent positions. This helps commissioning, operation, and maintenance.

What information is needed for quotation?

For a pillow plate jacket project, prepare the following information:

- Tank or reactor drawing

- Diameter, height, and shape

- Required jacket coverage area

- Process medium and operating temperature

- Utility medium and utility temperature

- Heating or cooling time requirement

- Operating pressure

- Material requirement

- Connection standard

- Installation restrictions

With these details, the manufacturer can design the jacket pattern, heat transfer area, thickness, and connection layout.

Conclusion

Pillow plate jackets are a practical solution for tanks and reactors that require efficient heating, cooling, or temperature control. Their welded pillow structure provides compact heat transfer area, good flow turbulence, and flexible customization for industrial process equipment.

Zhongzheng Thermal Technology Co.,Ltd manufactures pillow plate jackets and pillow plate heat exchangers for chemical, food, crystallization, purification, waste heat recovery, and other industrial applications. If you need a customized tank jacket or reactor cooling solution, ZZ Thermal can help evaluate the design based on your process data and vessel drawing.

FAQ

 What are pillow plate jackets used for?

Pillow plate jackets are used for heating, cooling, and temperature control of tanks, reactors, vessels, and process equipment.

Can pillow plate jackets be customized?

Yes. The jacket coverage area, flow path, material, plate thickness, and connection positions can be customized according to the tank or reactor design.

Are pillow plate jackets suitable for reactors?

Yes. They can be used for reactor heating or cooling, including exothermic reaction heat removal, when the design matches the process duty and pressure requirements.