PURPOSE: To carry out scale removal for the scale adhering to the circumferential wall of an evaporation tank in the same way as for the scale adhering to the bottom wall face by providing the evaporation tank for storing water to be evaporated and electrical heating means which heats and evaporates the water in the evaporation tank and in stalling that electrical heating means on the bottom wall face and circum ferential wall face of the evaporation tank.
CONSTITUTION: The water stored in an evaporation tank 1 is heated and evaporated by a bottom wall face heater 8 and a circumferential wall face heater 11, and the steam is supplied to a steam chamber 5 through a steam supply pipe 4. As the opera tion is continued, scale 10 adheres to the bottom wall face 1a and circumferential wall face 1b of the evaporation tank 1, but it is possible to remove satisfactorily the adhering scale 10 from the bottom wall face 1a and circumferential wall face 1b by repeating expansion and contraction of the bottom wall face 1a and circumferen tial wall face 1b caused by repeating the increase and decrease in the electric power supplied to the bottom wall face heater 8 and circumferential wall face heater 11. Lumps 10 of the scale that is removed is crushed by balls 9 that flow with the convec tion flow of the stored water and are discharged through a drain pipe 3 by a drain valve V2.
KUROSAKI KOICHI
KANAZAWA KOTETSU
SHIMIZU TAKAYOSHI
INOUE TAKASHI
UEDA SHINICHI
TOUKAGE NOBUHIKO
| JPS598003B2 | 1984-02-22 | |||
| JP50156850B |