THE HORIZONTAL RETORT BENCH
97
When choice of a regenerator is to be made consideration should, in. turn, be given to the following items :—
(1) The surface contact between the regenerator flues and the secondary-air flues must be ampie.
(2) Every precaution must be taken to ensure that no short-circuiting takes place. According to the construction of the regenerator this may occur:—
(a) Between secondary-air flues and waste-gas flues.
(b) Between producer and secondary-air flues.
(c) Between producer and waste-gas flues.
(3) There must be ampie facilities for the removal of dust, etc., from both waste-gas and secondary-air flues. In some types of regenerator no cleaning is possible until the whole is demolished. In this connection care should be taken to see that the stage floor of the house is not constructed so th.at it precludes cleaning of the horizontal flues on a level with it.
(4) Means for regulation of the secondary air to distinct parts of th.e setting should be provided. It is frequently found that the currents of air to the various nostrils ” vary in quantity to a considerable extent. For this reason dual or multiple regulation is arranged for in some types (see Figs. 27 and 48).
(5) The baffling arrangement in the secondary-air flues should not be too in-volved, otherwise an excessive draught will be necessary in order to pull the requisite quantity of air through. High velocity of draught means too rapid travel of the waste gases, which consequently leave the setting before efiecting the maximum exchange of heat. It is difficult to give any figure for the thickness of regenerator blocks, and a medium has to be struck so as to afford both good conductivity and stability.
Types of Regenerators
The principle of operation of regenerators is best understood by reference to dia
Kig. 41.—Klöns'e Regenerator Block.
Fig. 42.—Gibbons & Masters’ Regenbbatok Blocks (new type).
grams, and several illustrations of the most noteworthy types are liere reproduced. One of the best-known systems which came into use in the earliest days of regeneration
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