In a factory with six or seven boilers
of the usual size, making together 400 square meters heating surface,
two precipitating reservoirs, of ten cubic meters each, and one pure
water reservoir of ten or fifteen cubic meter capacity, are used.
In twenty-four hours about 240 cubic meters of water are evaporated; we
have, therefore, to purify twenty-four precipitating reservoirs at ten
cubic meters each day, or ten cubic meters each hour.
It is profitable to surround the reservoirs with inferior conductors of
heat, to avoid losses.
The contents of the precipitating reservoirs have to be stirred up very
well, and for this purpose we can either arrange a mechanical stirrer
or do it by hand, or the best would be a "Korting steam stirring and
blowing apparatus." In using the latter we only have to open the valve,
whereby in a very short time the air driven through the water stirs this
up and mixes it thoroughly with the precipitating ingredients. In a
factory where boilers of only 15 to 100 square meters heating surface
are, one precipitating reservoir of two to ten cubic meters and one pure
water reservoir of three to ten cubic meters capacity are required. For
locomobiles, two wooden tubs or barrels are sufficient.
THE PURIFICATION OF THE WATER.
After the required quantity of lime and carbonate of soda which is
necessary for a total precipitation has been figured out from the
analysis of the water, respectively verified by practical experiments
in the laboratory, the heated water in the reservoir is mixed with the
lime, in form of thin milk of lime, and stirred up; we have to add so
much lime, that slightly reddened litmus paper gives, after 1/4 minute's
contact with this mixture, an alkaline reaction, i.
Pages:
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31