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Title:
BOILER FEED-WATER SYSTEM, BOILER PROVIDED WITH SAID SYSTEM, AND CONTROL METHOD FOR BOILER FEED-WATER SYSTEM
Document Type and Number:
WIPO Patent Application WO/2016/129432
Kind Code:
A1
Abstract:
The present invention addresses the problem of preventing low-temperature corrosion of a feed-water heating device, installing a feed-water heating device so as to save space and suppress cost, and suppressing a drop in the water level in a drum. A boiler feed-water system is provided with a feed-water system (21) that has: a first route (21a) that feeds water to a feed-water heating economizer (2) that allows water, whose heat is exchanged with boiler water located inside a steam drum (11), to exchange heat with exhaust gas from a furnace; a second route (21b) that branches off from the first route (21a) before heat exchange with the boiler water occurs, bypasses the steam drum (11), and joins with the first route (21a) at a confluence point (X); and a third route (21c) that branches off from the second route (21b) and feeds water to the steam drum (11). The boiler feed-water system is further provided with: a temperature detection unit (24) that detects the temperature of water between the confluence point (X) and the feed-water heating economizer (2); a flow-rate regulation unit (25) that regulates the flow-rate of water flowing in the feed-water system (21); and a control unit that regulates the flow-rate such the water temperature detected by the temperature detection unit (24) is kept at or above a prescribed temperature that prevents low-temperature corrosion of the feed-water heating economizer (2).

Inventors:
AMANO, Masahiro (C/O MITSUBISHI HEAVY INDUSTRIES MARINE MACHINERY & ENGINE CO. LTD, 1-1, Akunoura-machi, Nagasaki-sh, Nagasaki 10, 〒8508610, JP)
MATSUSHITA, Koichi (C/O MITSUBISHI HEAVY INDUSTRIES MARINE MACHINERY & ENGINE CO. LTD, 1-1, Akunoura-machi, Nagasaki-sh, Nagasaki 10, 〒8508610, JP)
Application Number:
JP2016/052861
Publication Date:
August 18, 2016
Filing Date:
February 01, 2016
Export Citation:
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Assignee:
MITSUBISHI HEAVY INDUSTRIES, LTD. (16-5, Konan 2-chome Minato-k, Tokyo 15, 〒1088215, JP)
International Classes:
F22B1/18; F22D1/12
Domestic Patent References:
WO2014005476A12014-01-09
Foreign References:
JPH0933005A1997-02-07
JP2011196646A2011-10-06
Attorney, Agent or Firm:
FUJITA, Takaharu (37F The Landmark Tower Yokohama, 2-2-1 Minatomirai, Nishi-ku, Yokohama-sh, Kanagawa 37, 〒2208137, JP)
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