John Thompson: Mono-drum Co-generation Boiler
ACTOM group company John Thompson, leading local designers and manufacturers of industrial boilers, has developed a prototype co-generation boiler for use by the sugar and pulp & paper industries.
It has done so in response to market demand by local manufacturers and process industries wanting to upgrade the boilers used in their production processes to perform the additional function of producing co-generation power to be fed into the national electricity grid.
In line with the growing trend towards establishing co-generation capabilities within local industry. which has been boosted by the South African government’s commitment to encourage and accelerate such projects, John Thompson set out three years ago to expand upon the existing range of mono-drum boilers as used in the utility and petrochemical markets by developing a mono-drum co-generation boiler for the sugar and pulp & paper industries.
The company, a member of the ACTOM group, produced the mono-drum co-generation boiler design in early-2012. “Like the bi-drum boilers we manufacture and supply to these industries, the new mono-drum boiler is suitable for burning bagasse and other biomass, as well as coal,” said Etienne de Villiers, John Thompson’s Divisional Technical Manager.
The necessity to switch to a mono-drum design was dictated by the higher pressures required for co-generation boilers. “Typical steam pressures for the bi-drum boilers we provide for the sugar industry range from 19 to 45 bar. However, the optimum range for co-generation purposes is between 65 and 120 bar, for which the bi-drum configuration is not ideal,” he explained.
“The mono-drum boiler we have now developed retains the simplicity and reliability of our proven bi-drum arrangement, while gaining the advantages of a mono-drum design, which is similar in configuration to some established large power utility boilers.”
In addition to a single drum boiler replacing the bi-drum boiler arrangement, the other most significant change made is introduction of a flag-type evaporator in place of a mainbank.
The boiler under development has a steam output of 175 t/h, produced at 81 bar and 525° C. “The same basic design will be used for pressures up to 120 bar. The conceptual boiler design has been developed and sized based on the thermal and circulation requirements and is ready to be detailed at contract award, with the boilers being custom-designed in accordance with each customer’s requirements,” De Villiers pointed out.
ACTOM (Pty) Ltd is the largest manufacturer, repairer and distributor of electro-mechanical equipment and provider of turnkey solutions in Southern Africa, employing about 7 500 people with an annual order intake in excess of R7.5bn. It is a black empowered company with 42 operating units, 43 production, service and repair facilities, and 36 distribution outlets throughout Southern Africa.
ACTOM holds numerous technology, distribution and value added reseller agreements with various partners, both locally and internationally.
For further information contact Etienne de Villiers, John Thompson
PO Box 129, Bellville 7535
Tel (021) 959-8400 Fax (021) 959-8545
Press release compiled by Julian Kraft, J Kraft Public Relations
PO Box 2826 Wilropark 1731
Tel (011) 472-6686 Fax (011) 086-613-9657
Date: January 27, 2013
Caption: A bi-drum co-generation boiler in a local sugar mill.