Method and device for producing high temperature air for quick cooling of large turbine

Abstract

The invention discloses a method and a device for producing high temperature air for quick cooling of a large turbine. The device comprises a gas conveying device, a burning device, an air inducing device and a control system, wherein a temperature thermocouple of the control system is arranged in a high temperature air chamber; a programmable controller is respectively connected with a gas regulating valve and the temperature thermocouple; and another programmable controller is respectively connected with a second flow meter, a third flow meter and an air supply regulating valve. The method measures the temperature of the high temperature air chamber by measuring the thermocouple, the signal of the measured temperature is transmitted into the programmable controller, and the temperature setting value of the programmable controller is determined by the actually measured temperature value of the turbine after considering the heat stress. In the invention, the primary fuel of gas is used as an energy source for producing high temperature air for quick cooling of the large turbine, thus the energy source is saved, and the power is large; and meanwhile, the temperature and the flow rate can be controlled easily, thereby meeting the requirements of the temperature and the flow rate of the air for quick cooling after the large turbine shuts down.

Description

technical field [0001] The patent of the present invention relates to the field of thermal energy engineering, in particular to a high-temperature air production method and device for rapid cooling after a large steam turbine is shut down. Background technique [0002] In order to reduce the heat dissipation of high-parameter and large-capacity steam turbine cylinders, the thermal insulation performance of large-unit steam turbine cylinders is getting better and better. This is necessary during normal operation, it can reduce the external heat dissipation loss and the temperature difference of various parts of the cylinder, but in the natural cooling process of the overhaul shutdown, due to the poor heat dissipation conditions of the cylinder, the large heat capacity, and the slow temperature drop, the large-scale cylinders above 300MW When the steam turbine does not adopt the rapid cooling technology, it usually takes nearly 10 days to remove the cylinder, which prolongs th...

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Problems solved by technology

However, the air used in the traditional steam turbine compressed air cooling method adopts the electric heating method, which consumes a lot of power, the cooling air flow rate is small, and the control is difficult. It is difficult to meet the rapid cooling of large steam turbines.

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