Lower-half cylinder temperature compensation device of cylinder and temperature compensation method thereof

Abstract

The invention discloses a lower-half cylinder temperature compensation device of a cylinder, which mainly comprises an electric heating tube, wherein the electric heating tube is fixedly arranged on the outer side of the lower-half cylinder of the cylinder, and a heat insulation layer is arranged outside the electric heating tube. The invention also discloses a temperature compensation method for the lower-half cylinder temperature compensation device of the cylinder adopts the electric heating tube for heating and is characterized in that closed-loop control is performed on the electric heating tube by detecting the temperature of an upper cylinder and a lower cylinder and taking the temperature difference of the upper cylinder and the lower cylinder as a control signal, and the electric heating tube is used for heating the lower-half cylinder of the cylinder so as to reduce the temperature difference of the upper cylinder and the lower cylinder and realize temperature compensation. The lower-half cylinder temperature compensation device of the cylinder and the temperature compensation method thereof can perform comprehensive heating on the lower-half cylinder of the cylinder, and the heating is evener, so the temperature difference phenomena of the upper cylinder and the lower cylinder of the cylinder can be eliminated effectively, various running problems caused by the phenomena in the past are solved, and the safe operation of a steam turbine is ensured.

Description

technical field [0001] The invention relates to the field of steam turbine equipment, in particular to a temperature compensation device for the lower half of a cylinder and a temperature compensation method thereof. Background technique [0002] The steam intake and distribution degree of the steam turbine is generally concentrated in the upper half of the cylinder, and most steam turbines use the upper half of the steam intake. Therefore, during the start-up phase of the steam turbine, due to the uneven flow field inside the cylinder and the heat conduction of the steam intake chamber, the temperature difference between the upper and lower cylinders will increase. Very large, even if the full-circle steam inlet structure is adopted, a section of guide vane holding ring is directly behind the steam inlet chamber, and the phenomenon of large temperature difference between the upper and lower cylinders also exists, especially in high-temperature and high-pressure units, this s...

AI Technical Summary

Problems solved by technology

The large temperature difference between the upper and lower cylinders seriously affects the dynamic and static clearance of the unit, especially in units with relatively large relative spans, the rotor deflection is relatively large, and the large temperature difference in the upper and lower cylinders is likely to cause the seal at the bottom of the guide vane to collide with the rotor, affecting The safe operation of the unit; in addition, during the shutdown process, because the cooling of the lower half is faster than that of the upper half, the temperature difference between the upper and lower halves will be relatively large for a period of time in the middle, and there will be friction between the movement and the static, and the rotor cannot be cranked for about an hour. The cranking can only be continued after the temperature difference between the upper and lower half is reduced, which brings great inconvenience to the use.

In order to make the steam turbine run normally and safely, people try to solve the problem of temperature difference between the upper and lower half cylinders by warming up the engine. Heat conduction heating, due to the uneven flow field of the cylinder body, with the extension of the warm-up time, the temperature difference between the upper and lower halves will increase instead, and the maximum temperature difference will exceed 75°C. The usual method of warming up the engine cannot eliminate the temperature difference between the upper and lower half cylinders

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