Objective
The aim of this project is to convert surplus coke oven gas, produced as a by-product in the manufacture of coke from coal, into electricity using a gas turbine. This gas is currently flared to waste as no other economic uses have been found for it.
The electricity produced by this method will displace bought-in electricity producing a substantial saving in operating costs for the coke production plant.
About 1500 gj/day of surplus coke oven gas will be compressed to a pressure of between 14 and 17 bar using water injected screw compressors. This gas will be supplied at a temperature of between 50 and 100 deg. C into a modified gas turbine where it will be combusted to drive the turbine and generate between 3 and 3. 5 MW of electricity. About 800 kW will be required to compress the gas leaving 2. 2 to 2. 7 MW available for use in the coke production process. Any surplus electricity will be sold to the local electricity supply authority.
Particular attention must be paid to the de-watering and filtering of the gas as it leaves the compressor since the high molecular weight constituents of coke oven gas will polymerise at high temperature and pressure in the compressor. Water will be injected into the gas stream in the compressor to absorb the heat of compression and reduce the gas temperature below the critical limit. At the turbine feed pressure of 15. 5 bar there is considerablerisk of deposition of napthalene and other similar high molecular weight cyclic aromatic compounds. Water is also likely to condense if the gas temperature drops a few degrees after leaving the compressor. A solution to these problems is to cool the gas to condense out the water and then reheat it using a steam/gas heat exchanger to raise its temperature above the remaining water dew point and aromatic sublimation temperature. After reheating the gas must be filtered to remove particles larger than 5 microns to avoid damage to the turbine. The gas transmission pipework feeding the turbine will be insulated and, if necessary, electrically heated to maintain the temperature of the gas at 20 to 30 deg. C above the critical dew points.
There will be a 52 week acceptance test period during which the total running hours and net electricity production, after the power requirements for the compressor and ancillary plant have been subtracted, will be measured.
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Programme(s)
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Topic(s)
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Funding Scheme
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Funding scheme (or “Type of Action”) inside a programme with common features. It specifies: the scope of what is funded; the reimbursement rate; specific evaluation criteria to qualify for funding; and the use of simplified forms of costs like lump sums.
Coordinator
NG16 3EB Eastwood
United Kingdom
The total costs incurred by this organisation to participate in the project, including direct and indirect costs. This amount is a subset of the overall project budget.