| 摘要 |
<p>1,061,197. Controlling steam temperature; forced flow steam boilers. COMBUSTION ENGINEERING Inc. Oct. 31, 1963 [Nov. 15, 1962], No. 43005/63. Heading F4A. In a method for controlling the temperature of vapour generated in a forced flow vapour generator operating at subcritical or supercritical pressure and having a number of subcircuits (14) each with tubes connected in parallel, the rate of flow of liquid to each subcircuit is initially adjusted so that the rate of heat absorption in each is substantially uniform, and the rate of heat absorption in each subcircuit then being sensed to obtain a mean overall rate and then being simultaneously controlled in response to the sensed mean rate. Line (30) supplies feedwater to header (22) which supplies headers (16) of each subcircuit and also header (34) of control tubes (32). One tube (32) accompanies each subcircuit (14). At the beginning of the process thermocouples sense the heat absorped in each subcircuit and valves (26) are adjusted to make this uniform. The line (42) leads from common outlet header (40) of the control tubes to an outlet header of the subcircuits and is also connected to a temperature sensing device (44) controlling a device which operates either feedwater valve (28) or fuel valve (50). Valve (38) is adjusted to ensure the superheating of steam in the final portions of tubes (32).</p> |
