초록 ▼

A method and apparatus for determining the steam temperature in the impulse chamber at the first stage exit of a multistage high pressure steam turbine utilizes measurement of steam pressure in the impulse chamber and steam pressure and temperature at the exhaust as inputs to a digital computer. The

A method and apparatus for determining the steam temperature in the impulse chamber at the first stage exit of a multistage high pressure steam turbine utilizes measurement of steam pressure in the impulse chamber and steam pressure and temperature at the exhaust as inputs to a digital computer. The functional relationships among steam pressure, temperature, specific volume, enthalpy and entropy are stored in the computer memory, and used with these measured quantities to iteratively calculate the steam temperature at the impulse chamber.

대표청구항 ▼

In a multistage high pressure steam turbine having a first stage and an exhaust, a method for controlling turbine loading to effect a controlled rate of change in the steam temperature at an impulse chamber at the exit of the first stage thereof comprising the steps of: (a) measuring the steam press

In a multistage high pressure steam turbine having a first stage and an exhaust, a method for controlling turbine loading to effect a controlled rate of change in the steam temperature at an impulse chamber at the exit of the first stage thereof comprising the steps of: (a) measuring the steam pressure PEX at said exhaust; (b) measuring the steam temperature TEX at said exhaust; (c) measuring the steam pressure PIMP at said first stage exit; (d) determining and providing a measure of blade group efficiency; (e) providing tables defining the enthalpy h, the specific volume v, and the entropy S of steam as functions of pressure P and temperature T, defining T, v, and S as functions of P and h, and defining v, h, and T as functions of P and S; (f) calculating the enthalpy hEX, the specific volume VEX, and the entropy SEX from said tables at said exhaust; (g) calculating a first trial value of the enthalpy hIMP at said impulse chamber using said tables and the calculated value of hEX; (h) calculating a first trial value of the change in isentropic enthalpy DI from the calculated values of hEX and h′IMP; (i) calculating a first trial value of blade group losses DL from DI using the efficiency factor gIS at the exhaust by subtracting DL from hEX; (k) calculating second trial values of vEX and sIS from the tables and hIS; (l) calculating second trial values of hIMP, TIMP and DI using PIMP, hIS, SEX and the tables; (m) repeating steps h-j until a successive value of DI is less than a preselected tolerance; and (n) controlling steam flow into the first turbine stage so as to effect a contolled change in TIMP with variations in turbine loading.