Delta Pre Heater for Curing Delta Monolithic Lining

Therm process Engineering Pvt. Ltd. supplies a delta pre heater system designed specifically for curing delta monolithic refractory linings in steel melt shops (SMS). A freshly cast delta must be dried and cured under a controlled heating schedule before it goes into service. The Therm process system does this on site. The lined delta is placed on a circular support casing above a combustion chamber and heated through the curing cycle specified by the refractory supplier, typically 36 to 48 hours. The installation needs only about 12 square metres and can sit inside the SMS bay.

What Is a Delta and Why Does It Need Curing?

In an electric arc furnace or ladle furnace roof, the delta is the central refractory section through which the electrodes pass. It is exposed to intense heat from the arc, so it is commonly made from monolithic refractory: a castable or rammed mass rather than individual bricks.

A newly cast monolithic delta contains water, both free moisture and chemically bound water, from the castable mix. If it is heated too quickly in service, that water turns to steam inside the refractory. This can cause cracking, spalling or even explosive failure. The delta must therefore be cured and dried under a controlled temperature schedule before use. The schedule, and the total time, is set by the refractory manufacturer.

A dedicated delta pre heater lets the melt shop carry out this curing reliably and repeatably, without relying on improvised heating.

Therm process Delta Pre Heater

The Therm process delta pre heater is a purpose-built curing system:

• Circular support casing: The duly lined delta is placed on a circular support casing.
• Combustion chamber: Located beneath the support, it supplies heat to the delta.
• Compact footprint: The complete installation needs about 12 m of space.
• SMS bay location: It can be conveniently located in the steel melt shop bay, close to where deltas are relined and used.
• Curing cycle: Typically 36-48 hours, as recommended by the refractory supplier.

Therm process manufactures its own burners and combustion blowers, and can supply the combustion system matched to the pre heater.

Technical Specifications

Parameter	Specification
Purpose	Curing of delta monolithic lining
Arrangement	Lined delta placed on circular support casing with combustion chamber
Space Required	About 12 m
Location	Steel melt shop (SMS) bay
Curing Cycle	Typically 36-48 hours, as recommended by refractory supplier
Heating	Burner fired (Therm process combustion system)
Fuel	As per site availability
Control	As per curing schedule requirement

Key Features

• Dedicated to delta curing, not a general-purpose heater.
• Small 12 m footprint.
• Located in the SMS bay, reducing delta handling.
• Follows refractory supplier curing schedules.
• In-house combustion equipment.

How Delta Curing Works

• Placement: The freshly lined delta is placed on the circular support casing.
• Low-temperature drying: Firing starts gently to drive off free moisture.
• Controlled ramp: Temperature is raised in stages as per the refractory supplier's schedule.
• Holding: It is held at specified temperatures to remove chemically bound water.
• Completion: After the 36-48 hour cycle, the cured delta is ready for installation.

Applications

• Curing new delta monolithic linings.
• Curing relined or repaired deltas.

Industries Served

• Steel melt shops (EAF and ladle furnace operations)
• Integrated and secondary steel plants

Benefits

• Reduced risk of cracking and spalling from uncontrolled heating.
• Repeatable curing to the refractory maker's schedule.
• Longer delta service life through proper curing.
• Space-efficient installation.

Why Choose Thermprocess?

• Since 1997, Mumbai.
• Steel plant equipment experience: reheating furnaces, ladle preheaters, porous plug cleaning systems.
• In-house burners and blowers.
• ISO 9001 & ISO 14001 certified, as stated by the company.

Related Therm process Products

• Porous Plug Cleaning System
• Ladle Preheater
• Industrial Burners
• Combustion Blower
• Accessories

Frequently Asked Questions

Q1. What is a delta pre heater?
It is a burner-fired system for curing and drying delta monolithic refractory linings before they are used in steel melt shop furnace roofs.
Q2. Why does a delta monolithic lining need curing?
Fresh monolithic refractory contains water. Heating it too fast in service can turn that water to steam inside the lining and cause cracking or spalling. Controlled curing removes the water safely.
Q3. How long does delta curing take?
A typical curing cycle is 36-48 hours, following the schedule recommended by the refractory supplier.
Q4. How much space does the Therm process delta pre heater need?
About 12 square metres. It can be located in the steel melt shop bay.
Q5. What information is needed for a quotation?
Share the delta dimensions and weight, the refractory supplier's curing schedule, fuel available, and the proposed location in the SMS.

Need a Delta Curing System?

Share your delta size, refractory curing schedule and available fuel. Therm process will propose a delta pre heater for your melt shop.

Request a Quote