Device and method for coordinated adjustment of steam pressure and temperature
A steam and pressure technology, applied in the field of desuperheater and pressure reducer, can solve the problems of high superheat of outlet steam, inaccurate control, slow temperature change response, etc., to reduce vibration and noise, increase steam volume, and reduce energy loss Effect
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Embodiment approach 1
[0036] The steam flows into the steam inlet section 1 with a flow rate of 40t / h, a pressure of 4.0Mpa, and a temperature of 400°C. The orifice is determined according to the pressure and temperature at the large diameter of the throttling and decompression section 2, combined with the user's needs. The level of the board. If the pressure ratio between the front and back of the throttle orifice reaches 0.5, the hole area of the throttle orifice can be calculated according to formula (1):
[0037]
[0038] In the formula, G is the orifice flow rate, t / h; T 0 is the stagnation temperature in front of the orifice plate, K; K" is the coefficient, which can be checked according to the adiabatic index table, here it is taken as 0.667; μ is the flow coefficient; p 0 is the stagnation pressure in front of the orifice, MPa; g is the acceleration of gravity, m / s 2 ; R is the gas constant.
[0039] The hole diameter of the orifice plate is rounded to 20mm. The thickness of the or...
Embodiment approach 2
[0048] According to the steam temperature and steam pressure monitored at the large diameter of the throttling decompression section 2 and the actual use demand, the amount of cooling water is determined to determine the opening and closing of the inclined hole in the cooling water atomizing pipe 4 . According to the relevant theory of gas-liquid two-phase flow, the amount of cooling water is determined based on the calculation principle of material balance and heat balance, and the formula (3) is obtained:
[0049]
[0050] In the formula, W cw is the amount of desuperheating water, kg / h; W os is the output of export steam, kg / h; h is Enthalpy value of imported steam, kJ / kg; h os is the enthalpy value of outlet steam, kJ / kg; h cw is the enthalpy value of cooling water, kJ / kg; h' os is the enthalpy of saturated water, kJ / kg, It is the proportion of the non-evaporated part of the cooling water.
[0051] It is calculated that the initial flow rate of cooling water is 1...
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