Method for improving efficiency of steam heating, and papermaking method

A technology of heating efficiency and steam, applied in heating devices, lighting and heating equipment, papermaking, etc., can solve the problems of reducing cleaning frequency, achieve the effect of increasing cleaning frequency, improving efficiency, and inhibiting the formation of condensed water film

Active Publication Date: 2020-04-17
KURITA WATER INDUSTRIES LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0015] The inventors of the present invention have found that specific polyamines do not cause clogging, and can significantly reduce the sweeping frequency compared to long-chain aliphatic amines proposed in Patent Document 1. Spend

Method used

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  • Method for improving efficiency of steam heating, and papermaking method
  • Method for improving efficiency of steam heating, and papermaking method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0070] exist figure 1 In the papermaking drying equipment shown, the cylinder diameter of the Yankee dryer is set to 3m, the supply water vapor pressure is set to 0.6MPa, and the water vapor supply rate is set to about 900kg / h. The water vapor supply rate of the gram dryer is controlled by the flow regulating valve 9 so that the outer surface temperature of the cylinder becomes 100° C. and the moisture content of the dried product (paper) becomes 20 to 30%.

[0071] N-octadecenylpropane-1,3-diamine was used as polyamine.

[0072] Polyamine is added after emulsification with polyoxyethylene cocoamine. The compounding quantity of polyoxyethylene cocoamine was set to 15 weight part with respect to 100 weight part of polyamines.

[0073] When polyamine was added to the steam head 7 so that the polyamine relative to the amount of steam was 0.4 ppm, the original unit of steam before the addition was 2.94, but after the addition of the polyamine, it improved to 2.81. During the te...

Embodiment 2

[0075] In Example 1, except that 3.2 ppm of MEA and 2.2 ppm of DEEA were added as neutralizing amines in combination with polyamine, the operation was carried out in the same manner as in Example 1, and the steam unit and filter before and after addition of chemicals were investigated. With or without blockage. The results are shown in Table 1.

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Abstract

A method for improving the efficiency of steam heating, characterized by causing a polyamine represented by general formula (1) to be present in a steam system to be used for heating. R1-[NH-(CH2)m]n-NH2 (1) In formula (1), R1 represents a C10-22 (un)saturated hydrocarbon group; m is an integer of 1-8; n is an integer of 1-7; and when n is 2 or larger, the NH-(CH2)m moieties may be the same or different.

Description

technical field [0001] The present invention relates to a method for improving steam heating efficiency in the heating process of heating objects to be heated by steam through metal materials. The present invention also relates to a papermaking method for improving the production efficiency of papermaking equipment by adopting the method for improving heating efficiency. Background technique [0002] In papermaking factories, food and beverage manufacturing plants, etc., the products are dried, concentrated, or sterilized by heating the products with steam. For example, in a papermaking facility, wet paper having a moisture content of approximately 50% is dried to a moisture content of approximately 5 to 10% by a steam dryer equipped with a rotary drum. [0003] figure 1 It is a system diagram showing wet paper drying equipment using a Yankee dryer (dryer consisting of one large-diameter cast iron cylinder) as a steam dryer. Water is supplied to the boiler 5 through the w...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F26B13/18D21F5/10
CPCD21F5/10F26B21/005F26B13/18F26B13/183C23F11/08C23F11/141F26B23/001Y02P70/10
Inventor 森信太郎氏家章吾林倩
Owner KURITA WATER INDUSTRIES LTD
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