阅读说明：本技术 一种转炉煤气净化系统用高压电源控制方法 (High-voltage power supply control method for converter gas purification system ) 是由 施小东 郑立成 祝建军 傅远峰 庄向东 刘云 于 2020-04-15 设计创作，主要内容包括：本发明针对现有技术中高压击穿后限制高压电源在低电压下运行,除尘效率严重下降,导致排放超标的弊端,提供一种高压击穿后可以自动调节高电场电压,使电场能稳定运行不被击穿情况下达到最大电场电压的一种转炉煤气净化系统用高压电源控制方法,属于转炉煤气除尘系统技术领域。具体步骤包括高压电场电压启动到启动完成的阶段控制方法和电场电压启动过程中或启动完成后电场电压出现高压击穿后的阶段控制方法。(The invention provides a high-voltage power supply control method for a converter gas purification system, which aims at overcoming the defects that in the prior art, after high-voltage breakdown, a high-voltage power supply is limited to operate under low voltage, the dust removal efficiency is seriously reduced, and the emission exceeds the standard, can automatically adjust the voltage of a high electric field after the high-voltage breakdown, and enables the electric field to stably operate and reach the maximum electric field voltage under the condition of not being broken down, and belongs to the technical field of converter gas dust removal systems. The method comprises a stage control method from starting to finishing of the high-voltage electric field voltage and a stage control method after high-voltage breakdown of the electric field voltage occurs in the starting process of the electric field voltage or after finishing of the starting.)

1. A high-voltage power supply control method for a converter gas purification system is characterized by comprising the following steps:

stage one:

the system is started, and the power supply voltage is zero point voltage A1;

judging whether a normal working voltage A2 is set by a user;

if the user sets the normal working voltage A2, the electric field voltage of the dust remover starts to start from the zero voltage A1 according to a certain rising rate, and the power supply starts after the electric field voltage reaches A2;

if the user does not set the normal working voltage A2, the electric field voltage of the dust remover starts to start from the zero voltage A1 according to a certain rising rate, and the power supply starts after the voltage reaches the maximum rated voltage A3;

if the high-voltage electric field of the dust remover has high-voltage breakdown in the starting process or after the starting is finished, entering a stage II;

and a second stage:

if the electric field of the dust remover has high voltage breakdown, the high voltage power supply immediately closes the output to reduce the voltage to zero voltage A1, the voltage of the high voltage electric field is zero, the insulation strength of the electric field is waited to be automatically recovered, the breakdown voltage is B1, a monitoring device of the system transmits the breakdown voltage B1 to a storage device for storage, and a high voltage breakdown counter accumulates and adds 1 and stores in the storage device;

after the electric field insulation strength of the dust remover is recovered, the high-voltage power supply of the dust remover is restarted and quickly recovered to be close to the time when the breakdown voltage B1 appears last time, at the moment, the electric field voltage is C1, and C1 is smaller than B1;

b1 is compared with the historical breakdown voltage, if the difference value of the breakdown voltage is large, the electric field voltage continues to rise;

b1 is compared with the historical breakdown voltage, if the difference value of the breakdown voltage is small, the electric field voltage C1 is further compared with the minimum value of the electric field voltage of the dust remover;

if the electric field voltage C1 of the dust remover is lower than the minimum value of the electric field voltage of the dust remover, the electric field voltage continues to rise;

if the electric field voltage C1 of the dust remover is greater than the minimum value of the electric field voltage of the dust remover, maintaining the electric field voltage unchanged, and stably operating the dust remover;

if the electric field voltage continues to rise to the point of breaking through B1, high-voltage breakdown does not occur, the electric field voltage continues to rise until the maximum rated voltage A3 or the normal working voltage A2 is reached;

and if the electric field voltage continues to rise to the point of breaking through B1, high-voltage breakdown occurs, and the control step of the second stage is executed again.

2. The method as claimed in claim 1, wherein the storage device is used for storing a breakdown voltage value and a cumulative breakdown number; the monitoring device is used for monitoring electric field voltage signals, current signals and insulation strength signals; the high-voltage breakdown counter is used for accumulating the breakdown times of the electric field.

3. The method for controlling the high-voltage power supply for the converter gas purification system according to claim 1, wherein the maximum rated voltage A3 in the first stage is 80 KV-100 KV.

4. The method as claimed in claim 1, wherein the rate of rise in the first stage is 500 μ s, 100V to 5000V.

5. The method for controlling the high-voltage power supply for the converter gas purification system according to claim 1, wherein the breakdown voltage difference in the second stage is greater than or equal to 5 KV.

6. The method for controlling the high-voltage power supply for the converter gas purification system according to claim 1, wherein the minimum value of the electric field voltage in the second stage is a corona onset voltage +15 KV.

7. The method as claimed in claim 1 or 6, wherein the normal operating voltage A2 is greater than the minimum electric field voltage and less than or equal to the maximum rated voltage A3.

Technical Field

The invention belongs to the technical field of converter gas dust removal systems, and particularly relates to a high-voltage power supply control method for a converter gas purification system.

Background

The converter gas dust removal system is special environment-friendly equipment, a high-voltage power supply is key equipment in the converter gas dust removal system, and a high-voltage power supply control method is one of core technologies. The high-voltage power supply supplies electricity to the dust collector to generate high voltage, and the excited ions and electrons are used for charging dust to form electric field force to drive the charged dust to the dust collecting electrode. The high-voltage breakdown is a normal working state due to the complex change of the electric field working condition of the converter gas dust remover. After high voltage breakdown, if the control method of the high voltage power supply is improper, the high voltage power supply is easily changed into an arc discharge state. Converter gas belongs to flammable and explosive flue gas, and electric sparks generated by discharge arcing can ignite the flue gas to generate explosion, so that stable operation of equipment is influenced. If the high voltage is broken down, the high voltage power supply is limited to operate under low voltage, although explosion can be avoided, the dust removal efficiency is seriously reduced, and the emission exceeds the standard.

Disclosure of Invention

The invention provides a high-voltage power supply control method for a converter gas purification system, which can automatically adjust a high-voltage electric field after high-voltage breakdown and maintain the voltage of the electric field to stably operate at an optimal high voltage, aiming at the defects that the emission exceeds the standard due to the serious reduction of the dust removal efficiency and the limitation of the operation of the high-voltage power supply at the low voltage after the high-voltage breakdown in the prior art.

The invention aims to be realized by the following technical scheme:

a high-voltage power supply control method for a converter gas purification system comprises the following steps:

stage one:

the system is started, and the power supply voltage is zero point voltage A1;

judging whether a normal working voltage A2 is set by a user;

if the user sets the normal working voltage A2, the electric field voltage of the dust remover starts to start from the zero voltage A1 according to a certain rising rate, and the power supply starts after the electric field voltage reaches A2;

if the user does not set the normal working voltage A2, the electric field voltage of the dust remover starts to start from the zero voltage A1 according to a certain rising rate, and the power supply starts after the voltage reaches the maximum rated voltage A3;

if the high-voltage electric field of the dust remover has high-voltage breakdown in the starting process or after the starting is finished, entering a stage II;

and a second stage:

if the electric field of the dust remover has high voltage breakdown, the high voltage power supply immediately closes the output to reduce the voltage to zero voltage A1, the voltage of the high voltage electric field is zero, the insulation strength of the electric field is waited to be automatically recovered, the breakdown voltage is B1, a monitoring device of the system transmits the breakdown voltage B1 to a storage device for storage, and a high voltage breakdown counter accumulates and adds 1 and stores in the storage device;

after the electric field insulation strength of the dust remover is recovered, the high-voltage power supply of the dust remover is restarted and quickly recovered to be close to the time when the breakdown voltage B1 appears last time, at the moment, the electric field voltage is C1, and C1 is smaller than B1;

b1 is compared with the historical breakdown voltage, if the difference value of the breakdown voltage is large, the electric field voltage continues to rise;

b1 is compared with the historical breakdown voltage, if the difference value of the breakdown voltage is small, the electric field voltage C1 is further compared with the minimum value of the electric field voltage of the dust remover;

if the electric field voltage C1 of the dust remover is lower than the minimum value of the electric field voltage of the dust remover, the electric field voltage continues to rise;

if the electric field voltage C1 of the dust remover is greater than the minimum value of the electric field voltage of the dust remover, maintaining the electric field voltage unchanged, and stably operating the dust remover;

if the electric field voltage continues to rise to the point of breaking through B1, high-voltage breakdown does not occur, the electric field voltage continues to rise until the maximum rated voltage A3 or the normal working voltage A2 is reached;

and if the electric field voltage continues to rise to the point of breaking through B1, high-voltage breakdown occurs, and the control step of the second stage is executed again.

In the scheme, the normal working voltage A2 can be set according to the site emission requirement and the equipment operation condition.

Preferably, the storage device is used for storing the breakdown voltage value and the accumulated breakdown times; the monitoring device is used for monitoring electric field voltage signals, current signals and insulation strength signals; the high-voltage breakdown counter is used for accumulating the breakdown times of the electric field.

Preferably, the maximum rated voltage a3 in the first stage is 80KV to 100 KV.

Preferably, the rise rate in the first stage is 500 microseconds, and the rise rate is 100V-5000V and is adjustable. The influence on the power grid can be reduced by adjusting according to the load condition and the capacity of the power grid.

Preferably, the breakdown voltage difference in the second stage is greater than or equal to 5 KV. Generally, the high-voltage breakdown voltage is relatively stable in a time period, which is represented by the last high-voltage breakdown voltage, and the difference of the breakdown voltages is relatively close to the next high-voltage breakdown voltage. Under special working conditions, however, the high-voltage breakdown voltage difference value changes greatly within a time period, the breakdown voltage value changes greatly, and the last breakdown voltage value needs to be broken through continuously at this time to determine the current breakdown voltage value.

Preferably, the minimum value of the electric field voltage in the second stage is the corona starting voltage +15 KV. The starting corona voltage is the voltage corresponding to the high-voltage discharge current just beginning to appear in the electric field, the starting corona voltage is generally related to the shape of a discharge electrode of the high-voltage electric field and the distance between the two electrodes, and the starting corona voltage is determined after the mechanical structure of the high-voltage electric field is determined.

Preferably, the normal operating voltage a2 is greater than the minimum electric field voltage and equal to or less than a maximum rated voltage A3.

Compared with the prior art, the invention has the following beneficial effects:

the normal working voltage A2 can be set according to the site discharge requirement and the equipment operation condition;

the control method can immediately turn off the high-voltage power supply after the high-voltage electric field is broken down, thereby avoiding electric sparks generated by discharge arcing; and the breakdown voltage of the high-voltage electric field is automatically adjusted, so that the electric field can stably run and reach the maximum electric field voltage without being broken down, and the dust removal efficiency is improved.

Drawings

FIG. 1 is a schematic control flow diagram of a first stage of starting a high voltage power supply;

fig. 2 is a schematic control flow diagram of the second stage after high voltage breakdown occurs.

Detailed Description

The invention will be further described with reference to examples of embodiments shown in the drawings to which: