Product  |  Description  |  Features
Description

The HORN® Forehearth GCS 300 system works with Centreline Air Cooling and represents a today’s  most advanced technology in the areas of forehearth design for high pull forehearth and highest temperature homogeneity requirements. The refractory structure design is up to date modern construction employing all today’s techniques to achieve optimum thermal homogeneity combined with minimum energy requirement.

High quality refractory material is used for channel blocks. All channel block joints are backed up with zircon mullite split tiles and are surrounded with suitably graded insulation material.

The roof blocks of the superstructure in the cooling sections are of a special shape to ensure the best possible heating of the glass. The blocks are shaped like flat roof blocks with the central portion lowered towards the glass surface. The lowered part of the roof block provides a turbulent waste gases coming from the burners. The heating of the outer edges is also assisted by reflected flame radiation, due to the inclined design of parts of the roof block. This design provides a reduction in the temperature difference in the glass between the centre and the outer edges of the channel.

The combustion system is characterized by its long-lasting reliability in any operational situation and includes the constant gas/air ratio CORA system for stable firing by small pencil burners along the whole length of the forehearth.

Centreline Indirect Air Cooling
There are several openings in the centre part of the roof block along app. 75% of the length of each cooling zone. These openings are covered with a thin refractory tile lying on the top of the roof block. Cooling wind provided by a separate blower is fed in by a special opening into a small channel above the covering tiles and providing effective centre line cooling. The cooling air is leaving the cooling channel on via an opening on the opposite site of the cooling zone. The cooling airflow is controlled by a blower with inverter or butterfly flap with actuator.

One radiation cooling opening is foreseen in the superstructure cover blocks of the cooling zone. This opening is sized and located according to the cooling requirement. This opening is used in the case of low forehearth throughput were no centre cooling is required. The movement of the damper block, which is used to open or close the opening, varies the actual heat loss through the opening. In closed mode the waste gas leaves the forehearth via separate openings, which are located in the centre of the zone laterally on both sides.

Centreline Direct Air Cooling
For quick temperature adjustment after job changes HORN provide optionally a most effective cooling system containing a direct air cooling. For this purpose a special nozzle block is installed at the end of the first cooling section to blow cooling air into the atmosphere of the forehearth short above the glass surface. This reduces the glass temperature rapidly. After temperature adjustment the direct air cooling can be turned off and the parallel available indirect air cooling system can be turned on.

Centreline Indirect Bottom Cooling
An additional bottom cooling can be provided at the first cooling section. At this part a blower provides cooling air which is fed in to a small channel below the channel block and the flow of air is controlled manually.

 

Features

 for highest temperature homogeneity requirements
 for high capacity forehearths
 quantity of cooling air according to cooling requirements
 manual or automatic controlled cooling
 individual design according local conditions and specific glass requirement
 equipped with precise gas/air-mixture heating system “CORA”
 left and right side temperature control possible
 optional Lambda-control available
 optional equipped with Zirconium rope drain system
 optional equipped with boosting system in equalizing section

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