Plasma ignition high power switch power source

Abstract

A plasma ignition large-power switch power supply belongs to a switch power supply. Working current is set by a plasma switch power supply. A given current signal passes through a main controller and controls multiple groups of power supply modules which are connected in parallel at the same time. Each group of independent power supply module outputs current according to the current signal distributed by the main controller and finally outputs normal working current in parallel. The invention provides single-group power supply modularization, the working form of the multiple groups of power supply modules in parallel connection, the flow equalization form of the multiple groups of power supply modules in parallel connection as a master-slave mode, the control mode of the single-group power supply module as an average current mode and a power redundancy technology. The switch power supply is used in a plasma generator which ignites coal powder directly in a pulverized coal fired boiler to provide large-power direct current power supply and the switch power supply is multiple groups of switch power supplies in parallel connection and outputs high voltage and large current. The flow equalization form of the multiple groups of power supply modules in parallel connection is as the master-slave mode. The control mode of the single-group power supply module is as the average current mode. The power redundancy technology is used so as to improve the reliability. The plasma ignition large-power switch power supply has the characteristic of constant current, smaller volume, weight saving, high working frequency, fast response speed, very little loss and high working efficiency. Modularization design is adopted by the single-group power supply, so as to expand easily.

Description

Technical field [0001] The invention relates to a switching power supply for igniting a pulverized coal boiler, especially a high-power switching power supply for directly igniting pulverized coal when igniting, stabilizing and supporting combustion of a pulverized coal boiler. Background technique [0002] At present, the general ignition method when starting a coal-fired boiler in a power station is: first use the ignition device to ignite the oil burner to increase the temperature and pressure, and when the relevant parameters of the boiler meet the requirements for powder feeding, start the pulverizing system and the pulverized coal burner to realize Operate with load; when the boiler load is reduced to about 50%, it is necessary to inject oil for stable combustion to ensure the normal operation of the boiler. According to statistics, nearly 10 million tons of oil are used in electric power system boilers for ignition, stable combustion, and combustion support each year,...

AI Technical Summary

Problems solved by technology

[0003] In recent years, some scientific research institutes and enterprises at home and abroad have devoted themselves to researching the plasma ignition system for the ignition and stable combustion of coal-fired boilers. The plasma ignition combustion device has been used in some power plants, but there are still many problems. The main problems in the above are: the power supply used is a thyristor rectifier power supply, which requires high-power power frequency isolation transformers and reactors, which are huge and heavy; the power electronic devices of the thyristor rectifier power supply work at power frequency, and the response speed Slow; the volume of the isolation transformer and reactor is large, the operating frequency is low, and the loss is large, resulting in low efficiency of the power supply

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