750 EEPORT — 1889. 



6. Note on the Godillot Furnace, By A. Godillot.' 



The author has devoted himself to the study of the combustiou of poor materials 

 and waste products, in order to utilise them in the heating of generators, and to 

 secure an economical production of steam. 



These waste products comprise, on the one hand, damp ligneous matter, such as 

 spent tan. sugar cane refuse, &c. ; and, on the other hand, chips and sawdust from 

 workshops, the waste from looms, &c. 



For burning these residues the author invented the ' grille-pavilion,' which 

 answers perfectly. This grate is in the form of a half cone, it is formed of tapered 

 bars, which bars, overlapping like the laths of a Venetian blind, intercept the iinest 

 particles of matter. This form of grate is especially suitable for mechanical stoking, 

 it is only necessary to bring the combustible matter to a point at the top of the 

 conical grate, and it will distribute itself naturally over the whole surface of the 

 fire-bars. 



Encouraged by the success of his first experiments, the author endeavoured to 

 ascertain if the grates could not be modified so as burn good fuel in the form of 

 slack, and small pieces, whether of coal, coke, or anthracite. To this new grate he 

 has given the name ' grille a bassins stages,' because it consists of a series of troughs 

 arranged one below the other like steps. 



Coal having a higher calorific power than the ligneous and other waste products, 

 the difficulty was to avoid the rapid deterioration of the bars, and the formation of 

 adhesive slag on the grate. In order to remedy these inconveniences water is 

 caused to circulate through the bars. 



The ' grille a bassins (5tag6s ' has, moreover, the same general form as the ' grille- 

 pavilion ' ; it differs from it in the fact that to each bar is attached a tongue or rib, 

 which dips into a cast-u-on cistern tilled with water. This water is led into the 

 first cistern, and falls in a series of cascades, being finally received in the ash-pan. 



The coal ignites on the first bars, descends gradually to the others, and finally 

 accumulates on the horizontal grating where the slag forms, and whence the ashes 

 are withdrawn. 



This form of grate oiFers the following advantages: — (1) The feeding of the 

 fuel is regular and automatic ; (2) The combustion is practically complete, con- 

 suming the smoke ; (3) With slack a higher degree of evaporation is secured than 

 from the use of unscreened coal. Hence there is a first economy in the price of 

 the fuel, and a second in the higher efficiency. 



In a trial carried out by the Association of Steam Users of Paris it was proved 

 that with slack a vaporisation of 8-58 kilogrammes of water was obtained per kilo- 

 gramme of coal, with the boiler which, when furnished with an ordinary furnace, 

 vaporised under similar circumstances only 6'5 kilogrammes of water per kilo- 

 gramme of unscreened coal. (This unscreened coal was from the same pit as the 

 slack burnt in the Godillot furnace.) 



At the Paris Universal Exhibition the author heated by his process three sets 

 of boilers, furnishing steam for motive power and for the generation of electricity. 

 These were (1) a gramme installation with Davey Paxman and Co.'s boilers; 

 (2) Koser installation ; (3) Steinlen exhibit (formerly Ducommun's workshops). 

 The first of these only is here described. 



An idea of its general features was given by a diagram. Messrs. Davey Paxman 

 have entrusted the author with the heating of their boilers, representing a total of 

 1,000 horse power (French). Five boilers (locomotive type) supply the engines 

 which drive the dynamos belonging to the illuminated fountains, two arc-lamps in 

 the galerie des machines, and in the central dome ; the other four supply motive 

 power to the British and American sections. The boiler-house is underground ; 

 an Archimedean screw elevator lifts the slack and supplies it to the grates by a 

 series of helical distributors, which are driven by a small separate engine. 



The boilers generate 12,000 kilo, of steam per hour. They have an immense 

 amount of work to do in the evening when the illuminated fountains are playing. 



• See Engineering, vol. slviii., p. 336. 



