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Industrial fire protection for belt dryers – detecting fires at an early stage and extinguishing them effectively

When hot air comes into contact with flammable material, every second counts.

Belt dryers are indispensable in many industrial production processes. However, wherever flammable materials are dried using high temperatures and large volumes of air, there is a risk of fire. Sparks, embers or over-dried material can trigger fires that spread within the plant and cause considerable damage.

With the GreCon PROTECTOR BELT DRYER, we detect critical fire incidents at an early stage and activate targeted fire-extinguishing measures in the affected areas of the dryer. Through intelligent detection and section-by-section extinguishing, water usage can be minimised whilst protecting unaffected areas of the plant. This reduces potential consequential damage and unplanned production downtime.

  • Detect sparks, embers and fires at an early stage
  • Targeted extinguishing of affected dryer sections and minimisation of water damage
  • Monitor plant during operation and when shut down

Risks and challenges

Belt dryers – an underestimated fire risk

In belt dryers, moisture is removed from the material by feeding in heated air. This process involves high temperatures coming into contact with products that are often flammable. The continuous movement of material and strong air flows can contribute to sparks and embers spreading within the plant.

Fires that start unnoticed inside the dryer are particularly dangerous. Without early detection, localised fires can spread to other areas and cause significant damage to conveyor belts and other plant components.

Spread of smouldering embers

Pockets of embers can be carried further along the conveyor belts and by air currents within the dryer. As a result, a fire that was initially localised can spread to other areas of the dryer or to the material discharge point.

Over-drying and overheating

If material is heated too much or over-dried, the risk of ignition increases. Technical defects or faults in the drying process can also cause critical temperature rises and lead to the formation of pockets of embers.

Entry of sparks and hot particles

Sparks or smouldering particles may be generated as early as in upstream production processes and enter the belt dryer via the material feed. If they come into contact with combustible material there, they may trigger a fire.

GreCon PROTECTOR BELT DRYER: Industrial fire protection that intervenes where danger arises

An effective protection concept monitors the belt dryer in those areas where fire hazards can arise and spread. These include the material inlet and outlet, turning mechanisms, belt ends, and extraction and air ducting areas.

GreCon PROTECTOR BELT DRYER combines intelligent detection, rapid signal processing and automatic fire-suppression measures in a modular fire protection system.

The key principle: fire incidents are detected at an early stage and pinpointed to the affected areas of the dryer. Instead of flooding the entire dryer, individual extinguishing sections can be activated in a targeted manner. This reduces water consumption and protects adjacent areas of the plant from unnecessary water exposure.

Detecting fire hazards early and reliably

The SCOUT detectors monitor critical areas of the belt dryer for sparks, hot particles and flames.

These include, for example, the material inlet and outlet, turning mechanisms, belt ends, fans in extraction systems, and return and exhaust air areas. Daylight-insensitive spark detectors such as the GreCon SCOUT DLD 1/9 reliably detect ignition sources – even under changing light conditions.

Additional monitoring functions ensure that fire hazards can be detected even whilst the plant is shut down.

Process signals. Control protective measures locally.

GreCon MISSION CONTROL consolidates the information from the connected detectors, monitors the fire protection system and coordinates the specified protective measures.

The GreCon RANGER handles decentralised signal processing in the vicinity of the detection and suppression components. It processes signals on-site and triggers the necessary responses within milliseconds. This shortens signal paths and reduces the amount of cabling required.

Together, MISSION CONTROL and RANGER form an intelligent, distributed system architecture. The assignment of detectors to extinguishing sections enables a targeted response to fire incidents in individual dryer areas.

Targeted extinguishing rather than flooding the entire dryer

HUNTER fire suppression components direct the water precisely to where a fire has been detected. Instead of flooding a large area, the designated suppression sections are activated.

Special fine spray nozzles and extinguishing lances distribute the water within the affected areas. The extinguishing valves are situated close to the process, eliminating the need for long dry pipes. As a result, the water reaches the extinguishing area quickly, and hardly any air is blown out, which could further fan the flames.

This allows water usage to be limited, whilst unaffected areas of the dryer are protected from unnecessary water exposure. This reduces potential consequential damage to conveyor belts, plant components and material.

GreCon PROTECTOR system components
The components of the GreCon PROTECTOR BELT DRYER: from spark detection through signal processing to automatic extinguishing.

Tailored equipment protection with Plan

Every belt dryer has its own specific fire protection requirements. With GreCon PROTECTOR BELT DRYER, we combine the appropriate detection, control and suppression components to create a bespoke protective system – for both new and existing plants.

1

Analysing risks

We inspect materials, possible ignition sources and the plant layout. In doing so, we take into account critical areas of the dryer as well as fire hazards both during operation and when the plant is shut down.

2

Combining protective measures

We tailor the fire detection and section-by-section extinguishing systems to your facility. This results in a comprehensive fire safety concept with targeted use of water.

3

Integrate and support

We integrate the GreCon PROTECTOR BELT DRYER into your plant and expand the system as required. Regular servicing and maintenance help to ensure long-term operational reliability.

Flowsheet for a belt dryer
Flowsheet for a preventative safety concept, specifically tailored to a belt dryer with a reversing mechanism.

Illustration of a belt dryer

Preventative dryer protection with the proven GreCon concept

The GreCon formula for success in machine fire protection can be easily illustrated using a general belt dryer flowchart. It describes the interplay between the individual plant configuration and a bespoke protection concept based on high-precision GreCon technology.

Critical monitoring points include, for example, the feed and discharge sections, fans in extraction systems, the turning mechanism and the end of the dryer belt. Here, sensors that are insensitive to daylight, such as the GreCon DLD 1/9, provide a solution and reliably detect the initial stages of ignition. With the help of this sensor concept, which is individually tailored to your plant, Fagus-GreCon enables the precise localisation of the fire hazard within the dryer, thereby effectively preventing the belt dryer from being completely flooded.

The result: a significantly reduced danger of protracted production stoppages thanks to minimal, sequential use of water and the resulting reduction in damage to, for example, conveyor belts.

Even during downtime, the GreCon protection concept ensures safe plant monitoring – individually tailored to the plant’s requirements with spark or flame detectors. A transition from the production process to downtime is therefore possible at any time.

Should system flushing nevertheless be initiated, this is carried out using specially developed fine spray nozzles – a production-friendly and efficient method for practical, sequential flushing of individual dryer sections. The extinguishing system is designed to avoid long dry pipes. Instead, the extinguishing valves are located close to the process, thereby supplying the extinguishing area with water quickly and precisely. This minimises the blow-out of air in the drying duct area, so as not to fan the flames unnecessarily.

Experience you can rely on

For over 50 years, we have been developing solutions for preventative industrial fire protection. Our systems protect production lines across a wide range of industries and under demanding operating conditions.

Our experience, gained from over 400 protected belt dryers, is incorporated into every new protection concept. With the GreCon PROTECTOR BELT DRYER, we combine tried-and-tested protection principles with intelligent detection, modular system architecture and targeted extinguishing measures.

+400
protected belt dryers
+50
Years of experience in industrial fire protection
75,000
bespoke protection plans
+200,000
protected production lines worldwide

Fire protection for belt dryers: Frequently asked questions

Yes. The modular architecture allows it to be adapted to different plant configurations. Detectors, extinguishing zones and control components are configured to suit the layout and requirements of the respective belt dryer.

Yes. Fire hazards may persist even after the plant has been disabled. The GreCon PROTECTOR BELT DRYER therefore enables monitoring tailored to shutdown conditions – using sparks or flame detectors, depending on the plant’s requirements. This means that a transition from production to shutdown is possible at any time.

This allows critical events to be detected even outside regular production operations and appropriate protective measures to be triggered.

Large volumes of water used for extinguishing fires can cause further damage to conveyor belts, plant components and the material being processed. Targeted extinguishing directs the required water to the affected area and limits the amount of water reaching other parts of the plant.

The belt dryer is divided into individual, monitored extinguishing areas. If the system detects a critical fire incident, the affected extinguishing sections are activated. Special fine spray nozzles distribute the extinguishing water precisely within the respective area. This allows water usage to be reduced compared with flooding a large area.

The GreCon PROTECTOR BELT DRYER monitors critical areas of the plant using optical detectors that detect sparks, hot particles or flames. The signals are processed and assigned to the relevant protection areas. This enables the designated fire-suppression measures to be activated early and in a targeted manner.

Particularly at risk are the material inlet and outlet, turning mechanisms, belt ends, as well as extraction systems and air ducts. Accumulations of material or technical defects can also give rise to sources of fire inside the plant.

During the drying process, materials are exposed to heated air for an extended period. If these materials are flammable, high temperatures, sparks or embers can cause an ignition. Technical faults, over-drying or the ingress of hot particles further increase the risk.

Industrial dryer on a production line
Where high temperatures and large volumes of air come into contact with combustible materials, fire protection is required that intervenes in a targeted manner.

Detect fires at an early stage. Limit damage in a targeted manner.

Find the right protection solution with the GreCon PROTECTOR BELT DRYER. Our experts will develop a fire protection concept tailored to your plant and production process.