Predrying tunnels for mill drying devices |
|||||||
| 申请号 | US3747571D | 申请日 | 1972-05-11 | 公开(公告)号 | US3747571A | 公开(公告)日 | 1973-07-24 |
| 申请人 | DEUTSCH BABCOCK & WILCOX AG; | 发明人 | KUHN R; | ||||
| 摘要 | A predrying tunnel for the combustion chamber of a steam generator in which the cooling pipes of the steam generator comprise the walls of predrying tunnels and are arranged horizontally in a vertical superimposed array. The cooling pipes forming the walls of the predrying tunnels extend from gas port inlets at the top of the tunnels downwardly to the level of injection of coal into the predrying tunnels. Hot gases are drawn from the combustion chamber of the steam generator through the predrying tunnels to dry wet coal injected into the tunnel before it drops to a plurality of mills which pulverize the coal. A plurality of blowers coupled to the predrying tunnels draws the pulverized coal and gases from the tunnel and mills, and forces the gases and coal through the burners of the steam generator into the combustion chamber where the coal is ignited. | ||||||
| 权利要求 | 1. A predrying tunnel for the combustion chamber of a steam generator, comprising: a plurality of horizontally disposed, vertically superimposed, cooling pipes, disposed in spiral arrangement around the combustion chamber of the steam generator, said spiral arrangement of said pipes comprising one continuous pipe length and forming pipe walls on the interior surfaces of the combustion chamber, and being bent at at least one corner of the combustion chamber so as to form at least one vertical tunnel within the combustion chamber of the steam generator; means, coupled to said vertical tunnel, for guiding gases from the combustion chamber to said tunnel; at least one additional cylindrical tunnel coupled to said vertical tunnel in the combustion chamber; means, for injecting fuel into said cylindrical tunnel; and means, coupled to said cylindrical tunnel, and to the combustion chamber, for pulverizing fuel injected into said cylindrical tunnel, and drawing air from the combustion chamber through said vertical tunnel and said cylindrical tunnel and forcing said air and pulverized fuel into the combustion chamber of the steam generator. 2. The predrying tunnel as recited in claim 1, wherein said vertical tunnel is triangular in shape, one wall of said vertical tunnel comprising at least two adjacent vertical walls of superimposed pipes for separating the combustion chamber from the interior of said vertical tunnel. 3. The predrying tunnel as recited in claim 2, wherein said fuel pulverizing means comprises a paddle wheel mill, disposed at the bottom of said cylindrical tunnel, for pulverizing fuel injected into said cylindrical tunnel. 4. The predrying tunnel as recited in claim 3, wherein said paddle wheel mill further comprises blower means, for drawing gases from the combustion chamber through said vertical tunnel and said cylindrical tunnel into said miLl, and forcing the pulverized fuel and said gases into the combustion chamber of the steam generator. 5. The predrying tunnel as recited in claim 4, wherein said cylindrical tunnel is coupled to the combustion chamber of the steam generator by a plurality of elongated pipes and combustion chamber burners which guide the gases and pulverized fuel from said mill to the combustion chamber. 6. The predrying tunnel as recited in claim 1, wherein said vertical tunnel is circular in shape, and comprise a vertically disposed array of horizontal coils. 7. The predrying tunnel as recited in claim 1, wherein said cooling pipes comprising the walls of said vertical tunnel are disposed between the points at which said cylindrical tunnel and said means for guiding gases from the combustion chamber into said vertical tunnel are coupled to said vertical tunnel. |
||||||
| 说明书全文 | |||||||
QQ群二维码
意见反馈
意见反馈