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Sinter Plant Fans
Howden have been supplying fan products for the Sintering process since the early 1950’s. Our application knowledge and experience in these difficult applications ensures we can design fan solutions that fully meet all of process requirements.Engineered specifically to meet the challenge of the steel industry, each fan is custom designed and built to the most demanding standards.

Key benefits

Iron Ore Fines (dust) cannot be placed directly into the blast furnace to make Iron as it would block the passage of gasses inside the smelting vessel and snuff out the combustion process. To prevent this Iron ore is first processed into a material called Sinter.

Sinter is manufactured by mixing iron ore dust with coke and some other mineral additives. This mixture is then burnt at a relatively low temperature, in a sintering machine. This process causes the materials to fuse together into a porous “clinker” type material.

The fans that Howden engineer for the sinter plant applications are designed to specifically for the arduous conditions of the plant environment. High reliability and low maintenance are the main design considerations although there is increased client focus on plant efficiency.

 

Detailed specifications
The Howden fans used in the sinter production process are designed to give a stable volume characteristic with a self-limiting power curve. Erosion is a significant challenge in this application and Howden design features such as a cut-away centre-plate are used to reduce erosion effects.

Modern plants have efficient dust removal system before the fan, however a quantity of highly abrasive particles will remain in the gas. Although the dust composition will vary according to the ores being used and the plant operating conditions, the result is always erosion of the impeller surfaces.

Howden methodically assesses the protection required and our designs include replaceable wear plates to protect all vulnerable areas on the impeller. Typically, these plates will be made from a wear resistant steel material. In extreme cases they will include steel plates with a hard surface coating of chrome carbide or tungsten carbide. Different areas of the impeller blade will experience different degrees of attack. Therefore Howden fan designs use various types of protection within the impeller to balance wear protection effectiveness and cost.

Waste gas fan wear plates are designed to give a sacrificial protection to the main impeller structure. The use of bolts to attach the major wear plates ensures that on-site replacement is straightforward, with minimal downtime. The careful design of the Howden wear plates ensures that the aerodynamic performance of the fan is maintained with high efficiency.

Applications

Sinter Waste Gas Fan

The main waste gas exhaust fans are located downstream of a dust cleaning device, usually an electrostatic precipitator. The fan extracts the waste gas from the sintering machine, via a series of suction boxes mounted along the length of the sinter bed. The gas passes through the dust-cleaning device into the fan and is then discharged to atmosphere via a chimney stack.

The waste gas will typically be at temperatures up to 250 deg C and contain a quantity of highly abrasive dust in the region of 50 to 150 mg/Nm3 .

If the sinter waste gas fan is not operational then the entire plant will not be able to manufacture any sinter product. Reliability is therefore of the utmost importance.

In addition to reliability requirements, Sinter waste gas fans are normally very large machines consuming between 5 MW and 10 MW of electrical power to drive each fan. A high efficiency fan is therefore required to minimise running costs.

Sinter Cooling Air Fans

Sinter cooling fans push cold air though the sinter bed at the end of the process to quickly reduce the temperature of the sinter product. This enables the sinter material to be in a condition suitable for transported to a bulk storage area, where it is then used to feed the blast furnaces that manufacture steel.

Spare Parts

If the spares are for equipment originally supplied by Howden or one of our legacy brands, we can continue to support them through our extensive contract records, archives and original drawings.

Where some parts are no longer available we have the facility to engineer an equivalent replacement alleviating the requirement for full product replacement.

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