Biomass Pellets for Ceramic Industry: Kiln Firing with Agro-Waste Fuel in Gujarat

Gujarat's ceramic corridor — stretching from Morbi to Ahmedabad — is one of the world's largest tile and sanitary ware manufacturing clusters. Ceramic kilns are energy-intensive, consuming enormous quantities of fuel to achieve the 1000°C–1300°C temperatures needed for firing. Natural gas now fires most Morbi roller kilns, with propane or LPG used by some units, and biomass pellets are being evaluated as an alternative only where the equipment and process allow.

Temperature Requirements of Ceramic Kilns

Ceramic tile kilns operate in a precisely controlled temperature profile — from initial drying (100°C–200°C) through bisque firing (900°C–1050°C) to glaze firing (1100°C–1300°C). The fuel must burn cleanly, without excessive soot or sulfur, which can discolour the ceramic surface. BBI's biomass pellets have sulphur below 0.1%, which helps, but confirm suitability for your glaze process in a trial.

Why Ceramic Manufacturers Evaluate Biomass

The main driver is exposure to volatile gas and oil prices, while coal brings ash that can contaminate kiln atmospheres. BBI's biomass pellets are listed at ₹8–₹12/kg ex-factory for bulk orders (confirm in a written quotation). Points to assess:

• Compare delivered fuel costs using the buyer's current prices, batch GCV and measured equipment performance.
• Assess fuel compatibility and any required burner or handling changes with the kiln OEM or a qualified engineer.
• BBI agro-pellets are specified at sulphur below 0.1% and ash below 10% (typically 2–8%, depending on feedstock); batch lab reports are available on request.
• Confirm emissions, ash handling and product quality requirements through the plant's own testing and applicable consent conditions.

Kiln Compatibility and Modifications

Most roller kilns and tunnel kilns in the Morbi cluster are fired on natural gas burners. Using pellets in firing would normally mean a gasification arrangement or indirect heating designed by the equipment maker, so any conversion needs the following to be assessed:

• Fuel feed system: The required feeder and any installation work depend on the kiln and burner design. Obtain a site-specific proposal from the OEM or a qualified engineering contractor.
• Air-fuel settings: Determine operating settings during an OEM-reviewed commissioning trial using the selected fuel and measured combustion results.
• Economics: Estimate costs and payback only from written project quotations, delivered fuel prices and measured operating data for the specific kiln.

Typical buyer question: Can ceramic units run kilns or dryers on pellets, and what should we confirm about stack testing?

GPCB Compliance for Ceramic Units

Ceramic units operate under GPCB consent conditions that set stack emission norms for SPM (Suspended Particulate Matter) and SO₂. Compliance depends on kiln design, combustion and any emission control equipment. Low-sulphur, lower-ash pellets help, but stack testing decides.

Separate the Kiln From the Dryer and the Atomiser

A tile or sanitaryware plant uses heat in several very different places, and biomass does not suit all of them equally. Spray dryers (atomisers) that dry the ceramic slurry, vertical or horizontal dryers for formed tiles, and kilns for firing each have different temperature levels and different tolerance for particulates. Mapping these first prevents expensive mistakes.

Where pellets are commonly evaluated

• Hot air generators feeding spray dryers and tile dryers, where a solid-fuel furnace heats air through a clean exchange or a filtered path.
• Thermic fluid or steam units for utilities and smaller process heat.

Where care is needed

• Direct firing of kilns at glost or glaze temperatures, where flame characteristics, ash carry-over and atmosphere control are tightly managed.
• Any point where flue gas touches the product, since ash or fine particulate can affect surface quality.

Be cautious about any claim that pellets can simply replace gas in a roller kiln. A pellet cannot supply the instantly adjustable flame that a gas burner does, so any use in firing normally means indirect heating or a gasification arrangement designed by the equipment maker. Discuss your own kiln design with its supplier before spending on trials. For the gas side of the comparison, see biomass pellets versus natural gas in Morbi.

Why Spray Dryer Hot Air Is the Natural Starting Point

Spray drying is one of the heaviest heat users in a ceramic plant and runs with a comparatively moderate air temperature. A solid-fuel hot air generator needs stable feeding and a clean path for the air. Your questions for the equipment supplier include how fines in the pellet lot affect feeder behaviour, how the system reacts if the feed rate varies, and whether any particulate filtering is present before the air reaches the slurry. Pellets with consistent size and low dust help here, so ask for details of durability and look at our pellet durability guide when preparing your acceptance checks.

Specification Points Worth Writing Down

BBI briquettes and agro pellets are specified at GCV 3800 to 4200 Kcal/kg, moisture below 10%, ash below 10% (typically 2 to 8% by feedstock) and sulphur below 0.1%, confirmed by the batch lab report available on request. For ceramics, the practical interest is ash, since it can end up in the furnace, the air stream or the dried body. Ask which feedstock sits behind each lot and compare ash against your own limit. Premium wood pellets have a separate specification, GCV 4400 to 4800 Kcal/kg and ash below 1%, and may be worth discussing where cleanliness matters most.

Trial Design for a Ceramic Unit

1. Pick one hot air generator or one utility boiler, not the whole plant.
2. Record fuel consumed per tonne of dried product or per unit of heat delivered, from your own metering.
3. Inspect product at the dryer outlet for surface defects, dust deposits or discolouration during and after the trial.
4. Log ash removal and any clinker, then agree a de-ashing routine from observation.
5. Take stack readings with your regular testing agency; test results, not fuel labels, decide whether limits are met.

The 25 MT minimum is sized for this purpose. If results look promising, you can discuss the 50 MT per month standard contract. Our note on pellets for glass plants covers a neighbouring high-temperature sector with similar concerns, and the fuel cost calculator will let you compare against your current gas or coal bill using your own delivered prices.