[특허]Method for dehumidification

Method for dehumidification 원문보기

IPC분류정보
국가/구분	United States(US) Patent 등록
국제특허분류(IPC7판)	F26B-003/34
출원번호	UP-0568722 (2006-11-14)
등록번호	US-7694432 (2010-05-20)
우선권정보	SE-0302277(2003-08-21)
발명자 / 주소	Eriksson, Niclas Svenningsson, Lars
대리인 / 주소	Capitol City TechLaw
인용정보	피인용 횟수 : 6 인용 특허 : 94

초록 ▼

The present invention concerns a method and apparatus for dehumidifying, drying or the like of different materials. The invention is developed primarily for dehumidification of sewage sludge (7), but it may be utilized for many different materials including foodstuffs as crispbread and pasta. The sludge (7) or other material is dehumidified or dried in a chamber (1) by means of thermal radiation. The thermal radiation is given by means of one or more elements (2) for thermal radiation. The thermal radiation is concentrated to one or more distinct wavelength ranges at which water has peaks for absorption of radiation energy. Air is circulated in the chamber (1), to take up moisture evaporated from the material.

대표청구항 ▼

The invention claimed is: 1. A method for dehumidification and sanitation of sewage sludge in a chamber, the method comprising: receiving the sewage sludge on a conveyor made of net that is located inside the chamber; emitting thermal radiation from at least one element in the chamber, wherein the at least one element is positioned between an upper part and a lower part of the conveyor, the thermal radiation is concentrated to one or more distinct wavelength ranges at which water has peaks for absorption of radiation energy, and the wavelengths of the thermal radiation are shorter than the openings of the surface structure of the sewage sludge; circulating air in the chamber using a fan to take up moisture evaporated from the sewage sludge; recovering energy from the moisture using a condenser; and maintaining the sewage sludge at a constant temperature within the range of 70-120° C. during the dehumidification cycle. 2. The method of claim 1, wherein the at least one element emits thermal radiation that is concentrated to exact wavelength ranges where the water has an absorption coefficient greater than approximately 1,000 cm−1, while the radiation is reduced in other areas. 3. The method of claim 2, wherein the radiation is concentrated to the wavelength ranges of approximately 6-7 μm and approximately 10-20 μm, while the radiation in the intermediate range of approximately 7-10 μm is reduced. 4. The method of claim 1, further comprising monitoring the prevailing moisture ratio and/or the temperature of the sewage sludge and/or the chamber. 5. The method of claim 4, wherein the moisture ratio of the sewage sludge and/or the chamber is monitored by means of one or more indicators. 6. The method of claim 4, wherein the moisture ratio of the sewage sludge and/or the chamber is monitored by means of a weighing machine, monitoring the total weight of the chamber. 7. The method of claim 1, further comprising circulating the air of the chamber through a conduit going from one end of the chamber to the opposite end; wherein a heat exchanger is placed in the conduit for recovery of energy. 8. The method of claim 1, wherein the thermal radiation is reflected on high-reflective material on the inside of the chamber. 9. An apparatus for dehumidification and sanitation of sewage sludge in accordance with the method as claimed in claim 1, wherein the apparatus comprises: indicators for sensing the temperature and/or moisture ratio of the chamber and/or the sewage sludge; and a control system (PLC system) for controlling the at least one element and the fan in response to signals received from the indicators. 10. The apparatus of claim 9, wherein the at least one element is mounted in a rack having surfaces displaying high reflectance. 11. The apparatus of claim 9, wherein the inside of the chamber is made of or clad with a material displaying high reflectance; wherein the chamber is provided with an air inlet, an air outlet, a fan system, and a conduit, including a heat exchanger, for recirculation of the air of the chamber and one or more ventilation dampers; wherein indicators are provided for sensing temperature and air humidity in the chamber; wherein indicators are provided for sensing the weight of the sewage sludge; and wherein the signals from all indicators are fed to a calculation and control device. 12. The apparatus of claim 9, wherein the condenser is placed inside the chamber. 13. The apparatus of claim 9, wherein the at least one element comprises an electrical resistor surrounded by a tube that is made of material having properties to give the desired radiation spectrum. 14. The method of claim 1, further comprising: recovering plant nutrients from the sewage sludge. 15. The method of claim 1, further comprising: heating the at least one element using an energy carrying medium.

이 특허에 인용된 특허 (94)

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IPC	Description
A	생활필수품
A62	인명구조; 소방(사다리 E06C)
A62B	인명구조용의 기구, 장치 또는 방법(특히 의료용에 사용되는 밸브 A61M 39/00; 특히 물에서 쓰이는 인명구조 장치 또는 방법 B63C 9/00; 잠수장비 B63C 11/00; 특히 항공기에 쓰는 것, 예. 낙하산, 투출좌석 B64D; 특히 광산에서 쓰이는 구조장치 E21F 11/00)
A62B-1/08	.. 윈치 또는 풀리에 제동기구가 있는 것

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