2 ton hr 10 25 ton hrof steamreduction ratioof amount ofsteam two piece type saving of 7 mil saving of from10 yen year 2 200 to 5 500three piece type saving of 9 mil yen year14 80 thousand saving of from yen year 3 080 to 7 700 yen year______________________________________ an example of the apparatus of the present invention will be described below with specific reference to fig1 a description of the prior art apparatus shown in fig1 will be omitted the same symbols being put on the position where there is the same construction of the present invention as that of the prior art apparatus rectifying apparatus 20 of the present invention is different from the prior art rectifying apparatus in bottom portion 5a of column body 2a to make a description simple a case that bottom portion 5a is divided into bottom tanks 21 and 22 will be described an overflowing fluid flows from lowest plate 3a of the column in upper bottom tank 21 the overflowing fluid from upper bottom tank 21 flows to lower bottom tank 22 a hold up is taken out from lower bottom tank 22 through second offtake pipe 11 on the other hand a heating medium piping for heating the hold up inside.