IPC분류정보
국가/구분 |
United States(US) Patent
등록
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국제특허분류(IPC7판) |
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출원번호 |
US-0907667
(1978-05-19)
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발명자
/ 주소 |
- Ben-Shmuel Dan (St. Johnsville NY) Zacuto Philip (Johnstown NY)
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출원인 / 주소 |
- Woodside Construction, Inc. (Johnstown NY 02)
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인용정보 |
피인용 횟수 :
36 인용 특허 :
2 |
초록
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A method and apparatus for efficiently recovering heat from a gas stream such as discharged flue gas. The gas stream is countercurrently contacted with a liquid medium in two stages. A first countercurrent contact stage is between a partially cooled gas stream and cold liquid medium in a bed of pack
A method and apparatus for efficiently recovering heat from a gas stream such as discharged flue gas. The gas stream is countercurrently contacted with a liquid medium in two stages. A first countercurrent contact stage is between a partially cooled gas stream and cold liquid medium in a bed of packing through which the cold liquid medium flows downwards and the partially cooled gas stream flows upwards, so that a warmed liquid medium and fully cooled gas stream are produced. The second countercurrent contact stage is between the warmed liquid medium derived from the first contact stage and the hot initial gas stream in a plurality of parallel vertically oriented passages. The warmed liquid medium flows downward on the inner walls of the vertically oriented passages as a thin liquid film, while the hot initial gas stream flows upwards within the vertically oriented passages, so that a fully heated liquid medium and the partially cooled gas stream are produced. The second contact stage accomplishes high direct contact heat transfer with low mass transfer, so that minimal heat is lost as heat of vaporization of liquid medium evaporated into the gas stream. The fully heated liquid medium is passed in indirect heat exchange with a fluid, so that the liquid medium is cooled and the fluid, which may be water, air, or a process fluid stream, is heated.
대표청구항
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A method of recovering usable heat from a hot stream of waste stack gas or flue gas having particulate loading and including noxious products of combustion gases including sulfur dioxide which, when exposed to cool heat exchange surfaces will produce condensed active corrosive liquids, said method c
A method of recovering usable heat from a hot stream of waste stack gas or flue gas having particulate loading and including noxious products of combustion gases including sulfur dioxide which, when exposed to cool heat exchange surfaces will produce condensed active corrosive liquids, said method comprising: (A) as a first heat exchange step, bringing an aqueous liquid into direct physical contact with the hot gas stream whereby to extract heat from said stream and raise the temperature of the aqueous liquid and at the same time to cleanse said stream by (i) dispersing the particulate loading in the aqueous liquid and (ii) dissolving said noxious gases in said aqueous liquid (iii) so that a dirty heated liquid aqueous medium and a cool cleansed gas stream are produced, and further so that the noxious gases are removed as a dilute aqueous solution thereof and in an environment such that the dilute aqueous solution of dissolved noxious gases is innocuous, (iv) said aqueous liquid being an aqueous solution containing a dissolved alkaline medium selected from the group consisting of the hydroxide, sulfite and carbonate of sodium, potassium, lithium and ammonia, (B) then as a second heat exchange step, passing the dirty heated liquid aqueous medium with dispersed particulate loading and dissolved noxious gases in indirect heat exchange with a cooler fluid working medium such as process water, potable water, boiler feed water, air for space heating, and combustion air, (C) whereby the dirty heated liquid aqueous medium is cooled and the cooler fluid medium is heated so that the heat from the hot gas stream by means of said two heat exchange steps raises the temperature of the fluid medium without dirtying the fluid medium and without producing corrosive liquids from said noxious gases during the second heat exchange step, and (D) discharging at least a fraction of the cooled dirty aqueous liquid medium to waste. A method of recovering usable heat from a hot stream of waste stack gas or flue gas having particulate loading and including noxious products of combustion gases which, when exposed to cool heat exchange surfaces will produce condensed active corrosive liquids, said method comprising: (A) as a first heat exchange step, bringing an aqueous liquid into direct physical contact with the hot gas stream whereby to extract heat from said stream and raise the temperature of the aqueous liquid and at the same time to cleanse said stream by (i) dispersing the particulate loading in the aqueous liquid and (ii) dissolving said noxious gases in said aqueous liquid (iii) so that a dirty heated liquid aqueous medium and a cool cleansed gas stream are produced, and further so that the noxious gases are removed as a dilute aqueous solution thereof and in an environment such that the dilute aqueous solution of dissolved noxious gases is innocuous, (B) then as a second heat exchange step, passing the dirty heated liquid aqueous medium with dispersed particulate loading and dissolved noxious gases in indirect heat exchange with a cooler fluid working medium such as process water, potable water, boiler feed water, air for space heating, and combustion air, (C) whereby the dirty heated liquid aqueous medium is cooled and the cooler fluid medium is heated so that the heat from the hot gas stream by means of said two heat exchange steps raises the temperature of the fluid medium without dirtying the fluid medium and without producing corrosive liquids from said noxious gases during the second heat exchange step, and (D) discharging at least a fraction of the cooled dirty aqueous liquid medium to waste.
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