Drying hopper for polymer powder
IPC분류정보
국가/구분 |
United States(US) Patent
등록
|
국제특허분류(IPC7판) |
|
출원번호 |
US-0061367
(1993-05-14)
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우선권정보 |
JP-0123671 (1992-05-15) |
발명자
/ 주소 |
- Annen Yoshiaki (Ichihara JPX) Tsuzaki Akira (Tokyo JPX) Shizuma Isao (Tokyo JPX) Uetake Takao (Tokyo JPX) Ichimura Mitsunori (Ichihara JPX)
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출원인 / 주소 |
- Mitsui Petrochemical Industries, Ltd. (Tokyo JPX 03)
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인용정보 |
피인용 횟수 :
4 인용 특허 :
0 |
초록
▼
Disclosed is a drying hopper comprising, disposed in its lower position, a cone portion having diameters gradually decreasing toward a lower end thereof, in which a high temperature gas is injected toward powder descending in the cone portion to thereby dry the powder, wherein said drying hopper com
Disclosed is a drying hopper comprising, disposed in its lower position, a cone portion having diameters gradually decreasing toward a lower end thereof, in which a high temperature gas is injected toward powder descending in the cone portion to thereby dry the powder, wherein said drying hopper comprises a cone portion 11 having a slant, circular wall, said cone portion 11 having a plurality of vertically spaced rows of nozzles 20, formed through the circular wall, disposed at predetermined intervals in a circumferential direction of the circular wall; a plurality of vertically spaced ring-like shells 21 fluidtightly attached to an external surface of the circular wall of the cone portion 11 with interstices therebetween in positions such that said plurality of rows of nozzles 20 are respectively, at gas inlets thereof, covered by said plurality of ring-like shells 21; and a plurality of gas feed pipes 22 respectively connected to said plurality of ring-like shells 21 in communicating relationship. By virtue of this drying hopper, powder, e.g., polyethylene powder, can be dried to a solvent content as small as 20 ppm by weight or less by low cost, simple operations.
대표청구항
▼
A drying hopper for drying powder comprising, disposed in its lower position, a cone portion having diameters gradually decreasing toward a lower end thereof, in which a high temperature drying gas is injected toward powder descending in the cone portion to counterflow contact and dry the powder, wh
A drying hopper for drying powder comprising, disposed in its lower position, a cone portion having diameters gradually decreasing toward a lower end thereof, in which a high temperature drying gas is injected toward powder descending in the cone portion to counterflow contact and dry the powder, wherein said drying hopper comprises: a cone portion having a slant, circular wall, said cone portion having a plurality of vertically spaced rows of nozzles, in an amount of at least one nozzle per m3 of the hopper volume, formed through the circular wall, disposed at predetermined intervals in a circumferential direction of the circular wall, a plurality of vertically spaced ring-like shells, each having a semi-circular cross section, fluid tightly attached to an external surface of the circular wall of the cone portion with interstices therebetween in positions such that said plurality of rows of nozzles are respectively, at gas inlets thereof, covered by said plurality of ring-like shells, said gas inlets of the nozzles are open at respective lower zones of the interstices present between the ring-like shells and the external surface of the circular wall of the cone portion, and said gas outlets of the nozzles are positioned immediately above respective lower ends of the ring-like shells, and a plurality of gas feed pipes respectively connected to said plurality of ring-like shells in communicating relationship so that a high temperature gas is fed from said gas feed pipes to said respective ring-like shells and then through said respective rows of nozzles into the inside of said cone portion, each of said gas feed pipes is provided with a flow control valve, whereby said drying gas after counterflow contact with said powder is removed from the drying hopper through a gas outlet in the top of the hopper and the dry powder is removed from said hopper through an outlet at the bottom of the cone portion of the hopper.
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