Waste heat utilization generator set and galloping prevention device and method thereof

Abstract

Embodiments of the invention disclose a waste heat utilization generator set and a galloping prevention device and method thereof. The galloping prevention device of the generator set comprises a converter and a brake loop, wherein the converter comprises an alarm branch; the generator set is electrically connected to an energy consumption resistor through the converter; the converter controls thedisconnection between the generator set and the energy consumption resistor when the output voltage of the generator set exceeds the threshold voltage, and controls the alarm branch to be powered onat the same time; the generator set is electrically connected to the energy consumption resistor through the brake loop; the brake loop is connected to the alarm branch in parallel; and the brake loopcontrols the connection between the generator set and the energy consumption resistor according to the electrification of the alarm branch. During the process of closing an air inlet valve of an expander and opening an exhaust valve of the expander, the generator set is kept connected to the energy consumption resistor, the energy consumption resistor serves as a brake resistor to release the rotating speed of the generator set, and galloping of the generator set in the process of closing the air inlet valve of the expander and opening the exhaust valve of the expander is effectively prevented.

Description

technical field [0001] Embodiments of the present invention relate to the technical field of generating sets, in particular to a waste heat utilization generating set and a device and method for preventing runaway. Background technique [0002] Waste heat utilization power generation refers to the technology of converting excess heat energy in the production process into electrical energy. [0003] In the waste heat utilization generator set, the higher the speed of the generator set, the higher the output voltage of the generator set. The output voltage of the generator set is monitored by the converter. When the output voltage of the generator set exceeds the rated voltage or the protection threshold, the converter will disconnect the generator set from the load, and use the waste heat of the generator set to control the expansion of the expander. The intake valve is closed and the exhaust valve is opened to reduce the speed of the generator set to prevent the generator s...

AI Technical Summary

Problems solved by technology

[0004] However, at the moment when the converter disconnects the generator set from the load, the time for closing the expander inlet valve and opening the expander exhaust valve is often longer than the time for the generator set to go from rated speed to overspeed. Usually, closing It takes 4 seconds for the inlet valve of the expander to open the exhaust valve of the expander, and it takes 1-2 seconds for the generator set to go from rated speed to overspeed. Therefore, when the output voltage of the generator set exceeds the rated voltage or the protection When the threshold value is reached, only relying on the intake valve of the expander to close and the exhaust valve to open to reduce the speed of the generator set is still unable to prevent the generator set from flying

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