| 摘要 |
<p>694,626. Tubular heat-exchangers. UNITED ENGINEERS & CONSTRUCTORS, Inc. Feb. 6, 1952, No. 3103/52. Class 64 (iii) [Also in Group XII] Oil for use in the production of carburetted water gas is preheated in a heat-exchanger heated by the blow gases which are admitted at 40 to a high temperature preheater 48, Fig. 2, and pass from thence through a waste-heat boiler 41 and a low temperature preheater 47. The heaters comprise tubes 49, 57 connected by headers in series and supplied with oil by a pump 50, the pipe 55 connecting the two heaters. The temperature of pre-heat is controlled by valves 70a, 63-67 which allow the whole of the blow gases to pass through the length of the heater 48, or allow selected downstream tubes 57 to be by-passed by closing the valve 64 and using one or more of the passages 68-70, or allow the heater to be by-passed completely. The high temperature part of the preheater may be modified, as in Fig. 3, the oil being supplied by the pipe 55 which is connected in the header compartment 151 to the headers of tube rows 95, 97, 99-107, the headers in the opposite compartment 150 being connected at 131 to tube rows 96, 98-108, the rows being further connected at 132-137. The tubes 96-108 are connected through valves 125-130, 116 to an off-take pipe 148 for a cooling-medium, e.g., water or steam, which is supplied by a pipe 75 to such tubes 95-107 as are selected by manipulation of valves 89, 142-147, 109-115. This arrangement permits the heat-exchange to be adjusted by passing the oil through a greater or lesser number of tube rows, the tube rows, at the downstream end of the heater, which are idle as regards oil heating, being protected from burning by the circulation of the cooling-medium.</p> |
