公开(公告)号：US11186951B2

公开(公告)日：2021-11-30

申请号：US16641005

申请日：2018-11-21

Applicant: KURITA WATER INDUSTRIES LTD.

Inventor： Shintaro Mori ,  Hideki Nishida ,  Shogo Ujiie ,  Qian Lin

IPC: D21F5/18

Abstract: When the efficiency of heating with steam is enhanced by adding a condensed water film formation-suppressing amine in a heating step of heating a material to be heated with the steam via a metallic material, the amount of the condensed water film formation-suppressing amine to be added is controlled based on any of the concentration of the condensed water film formation-suppressing amine in a drain, the pH of the drain, the electroconductivity of the drain, the amount of the drain, the amount of the steam, the temperature of the drain, the temperature of the metallic material, and the amount of the metallic material eluted in the drain.

公开(公告)号：US11555274B2

公开(公告)日：2023-01-17

申请号：US16640272

申请日：2018-07-30

Applicant: KURITA WATER INDUSTRIES LTD.

Inventor： Shintaro Mori ,  Shogo Ujiie ,  Qian Lin

IPC: D21F5/10 ,  F26B21/00 ,  C23F11/14 ,  C23F11/08

Abstract: A method for improving the heating efficiency of steam wherein a polyamine represented by the following general formula (1) is caused to be present in a steam system to be used for heating. R1—[NH—(CH2)m]n—NH2 . . . (1) wherein R1 represents a saturated or unsaturated hydrocarbon group having 10 to 22 carbon atoms; m is an integer of 1 to 8, and n is an integer of 1 to 7; and when n is 2 or more, a plurality of NH—(CH2)m may be identical or different.