CN213453728U

CN213453728U - Pulverized coal fired boiler control system

Info

Publication number: CN213453728U
Application number: CN202020678915.9U
Authority: CN
Inventors: 隆文林
Original assignee: Individual
Current assignee: Beijing Qingyuan Shun Shun Environmental Protection Technology Co ltd
Priority date: 2020-04-28
Filing date: 2020-04-28
Publication date: 2021-06-15
Anticipated expiration: 2030-04-28

Abstract

The utility model provides a pulverized coal boiler control system, which comprises a three-phase power supply, a direct current voltage regulating module, a reactor Z1, a piezoresistor RV, a plasma spray gun electrode, a high-frequency arc striking circuit and a PLC control module, the three-phase power supply is connected with the alternating current input end of the direct current voltage regulating module through a lead, the direct current output end of the direct current voltage regulating module is connected with one end of the reactor Z1 through a lead, the other end of the reactor Z1 is connected with the power end of the electrode of the plasma spray gun through a lead, the voltage dependent resistor RV is connected with the reactor Z1 in parallel, the control signal output end of the PLC control module is respectively connected with the control end of the DC voltage regulating module and the control end of the high-frequency arc striking circuit through leads, the control signal output end of the high-frequency arc striking circuit is connected with the control end of the plasma spray gun electrode through a wire, and the design realizes the function of igniting the pulverized coal boiler.

Description

Pulverized coal fired boiler control system

Technical Field

The utility model relates to a pulverized coal fired boiler control system belongs to pulverized coal fired boiler control technical field.

Background

At present, the power of the thermal power plant in China is basically from a pulverized coal boiler, ignition and stable combustion of the thermal power plant are traditionally realized by burning rare fuels such as heavy oil or natural gas, an oil gun is ignited when the pulverized coal boiler is started, oil is burnt in a hearth for a period of time, then the hearth is heated to the ignition temperature of the pulverized coal, the pulverized coal is sprayed into the hearth for kerosene co-combustion, the oil is cut off until the pulverized coal is stably burnt, the ignition starting process is completed, plasma ignition is used as a new technology, the economy can be improved, the ecological condition of the thermal power plant can be improved, direct current air plasma is used as an ignition source, oil-free cold state starting of the boiler can be realized, and the plasma ignition has the advantages of energy saving and oil saving, therefore, plasma ignition is the preferred equipment for ignition and stable combustion of the thermal power plant in the future, and the existing plasma electric arc power supply system is a saturable reactor, the control system is an open-loop system, has no attractive feedback, has slow response and is unstable and easy to break, thereby increasing the cost of the system.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a pulverized coal boiler control system to solve the problem that proposes in the above-mentioned background art, the utility model discloses convenient to use has realized the function of igniteing to pulverized coal boiler, and stability is good, and response speed is fast, energy saving consumption.

In order to achieve the above purpose, the present invention is realized by the following technical solution: the utility model provides a pulverized coal boiler control system, includes three phase current, direct current voltage regulation module, reactor Z1, piezo-resistor RV, plasma spray gun electrode, high frequency arc striking circuit and PLC control module, three phase current is connected with the AC input end of direct current voltage regulation module through the wire, the DC output of direct current voltage regulation module is connected with reactor Z1's one end through the wire, reactor Z1's the other end is connected through the power end that the wire connects the plasma spray gun electrode, piezo-resistor RV and reactor Z1 parallel connection, PLC control module's control signal output end is connected with the control end of direct current voltage regulation module and the control end of high frequency arc striking circuit respectively through the wire, the control signal output end of high frequency arc striking circuit is connected through the control end of wire with the plasma spray gun electrode.

Further, the high frequency arc striking circuit comprises a transformer T1, the primary side of the transformer T1 is connected to an external single phase power source through a wire, the secondary side of the transformer T1 is connected to an ac input terminal of a rectifier bridge chip U1 through a wire, a dc output terminal of the rectifier bridge chip U1 is connected to pin No. 1 of the high frequency step-up transformer T2 through a wire, the first branch of pin No. 2 of the high frequency step-up transformer T2 is connected to the drain of a MOS tube Q1 through a wire, the second branch is connected to pin No. 1 of the high frequency step-up transformer T2 through a diode D1 and a capacitor C3, the cathode of the diode D1 is connected to pin No. 1 of the high frequency step-up transformer T2 through a resistor R1, the source of the MOS tube Q1 is grounded, the pin No. 4 of the high frequency step-up transformer T8 is connected to the anode of a diode D2 through a wire, the first branch of the cathode of the diode D2 is connected to pin No., the second branch is connected with one end of a spark arrester HF through a lead, the other end of the spark arrester HF is connected with one end of the primary side of a high-frequency coupling transformer T3 through a lead, and the other end of the primary side of the high-frequency coupling transformer T3 is connected with a No. 3 pin of a high-frequency boosting transformer T2 through a lead.

Further, the direct current voltage regulating module adopts a Siemens direct current device 6RA70, and the PLC control module adopts a PLC model FR-FX2 NC.

The utility model has the advantages that: the utility model discloses a pulverized coal boiler control system, the utility model discloses an add three phase current, direct current voltage regulation module, reactor Z1, piezo-resistor RV, plasma spray gun electrode, high frequency arc striking circuit and PLC control module, this design has realized carrying out the function of igniteing to pulverized coal boiler, has solved current plasma arc electrical power generating system and has been saturated reactor pressure regulating rectification power supply, and its control system is the open loop system, does not attract the feedback, and the response is slower moreover, and the system is unstable, and is easy disconnected solitary to the problem of the cost of system has also been increased, the utility model discloses convenient to use has realized carrying out the function of igniteing to pulverized coal boiler, and stability is good, and response speed is fast, energy saving consumed.

Drawings

Other features, objects and advantages of the invention will become more apparent upon reading of the detailed description of non-limiting embodiments with reference to the following drawings:

fig. 1 is a schematic system block diagram of a pulverized coal boiler control system according to the present invention;

FIG. 2 is a schematic circuit diagram of a high frequency arc striking circuit in a pulverized coal boiler control system according to the present invention;

Detailed Description

In order to make the technical means, creation features, achievement purposes and functions of the present invention easy to understand, the present invention is further described below with reference to the following embodiments.

Referring to fig. 1 and fig. 2, the present invention provides a technical solution: a pulverized coal boiler control system comprises a three-phase power supply, a direct current voltage regulating module, a reactor Z1, a piezoresistor RV, a plasma spray gun electrode, a high-frequency arc striking circuit and a PLC control module, wherein the three-phase power supply is connected with an alternating current input end of the direct current voltage regulating module through a lead, a direct current output end of the direct current voltage regulating module is connected with one end of the reactor Z1 through a lead, the other end of the reactor Z1 is connected with a power supply end of the plasma spray gun electrode through a lead, the piezoresistor RV is connected with the reactor Z1 in parallel, a control signal output end of the PLC control module is respectively connected with a control end of the direct current voltage regulating module and a control end of the high-frequency arc striking circuit through leads, a control signal output end of the high-frequency arc striking circuit is connected with a control end of the plasma spray gun electrode through a lead, the system adopts 380V power supply, then the reactor is connected with a plasma spray gun electrode to form a loop, wherein both ends of the reactor Z1 are connected with a piezoresistor RV in parallel, so that abnormal overvoltage occurring in the circuit is inhibited, and the circuit is protected from being damaged by the overvoltage.

The high-frequency arc striking circuit comprises a transformer T1, the primary side of a transformer T1 is connected with an external single-phase power supply through a lead, the secondary side of a transformer T1 is connected with an alternating current input end of a rectifier bridge chip U1 through a lead, a direct current output end of a rectifier bridge chip U1 is connected with a pin No. 1 of a high-frequency boosting transformer T2 through a lead, a pin No. 2 of a high-frequency boosting transformer T2 is connected with the drain of a MOS tube Q1 through a lead, the second branch is connected with the pin No. 1 of a high-frequency boosting transformer T2 through a diode D1 and a capacitor C3, the cathode of a diode D1 is connected with the pin No. 1 of a high-frequency boosting transformer T2 through a resistor R1, the source of the MOS tube Q1 is grounded, the pin No. 4 of the high-frequency boosting transformer T8 is connected with the anode of a diode D2 through a lead, the cathode first branch of a diode D2 is connected with the pin No. 3 of the pin, the other end of the spark discharger HF is connected with one end of the primary side of a high-frequency coupling transformer T3 through a lead, the other end of the primary side of a high-frequency coupling transformer T3 is connected with a No. 3 pin of a high-frequency boosting transformer T2 through a lead, when the high-frequency arc striking circuit works, direct current rectified by a rectifying chip U1 passes through a MOS tube Q1 and a control circuit thereof, a single-ended flyback converter formed by a high-frequency boosting transformer T2 outputs high voltage on the secondary side of a high-frequency boosting transformer T2 to provide required charging high voltage and energy for a spark discharge loop, when the charging voltage of a capacitor C2 reaches the discharge voltage of the spark discharger HF, spark discharge occurs, at the moment, the air gap of the spark discharger HF is close to an electrical short circuit state, the charged capacitor C2 discharges through the spark gap, so that high-frequency electromagnetic oscillation is formed in the loop, and further, and then high frequency and high pressure are output to achieve the purpose of arc striking, thereby realizing the function of igniting the pulverized coal boiler.

The direct current voltage regulating module adopts a Siemens direct current device 6RA70, and the PLC model adopted by the PLC control module is FR-FX2 NC.

The basic principles and the main features of the invention and the advantages of the invention have been shown and described above, it will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, but that the invention may be embodied in other specific forms without departing from the spirit or essential characteristics of the invention. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.

Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.

Claims

1. The utility model provides a pulverized coal fired boiler control system, includes three phase current, direct current voltage regulation module, reactor Z1, piezo-resistor RV, plasma spray gun electrode, high frequency arc striking circuit and PLC control module, its characterized in that: the utility model discloses a plasma torch electrode, including three phase current, reactor Z1, reactor Z1, piezo-resistor RV, high frequency arc striking circuit, three phase current is connected with the AC input end of DC voltage regulating module through the wire, the DC output end of DC voltage regulating module is connected with reactor Z1's one end through the wire, the other end of reactor Z1 is connected through the power end that the wire connects the plasma torch electrode, piezo-resistor RV and reactor Z1 parallel connection, PLC control module's control signal output end is connected with the control end of DC voltage regulating module and high frequency arc striking circuit's control end respectively through the wire, high frequency arc striking circuit's control signal output end is connected with the control.

2. The pulverized coal fired boiler control system according to claim 1, characterized in that: the high-frequency arc striking circuit comprises a transformer T1, and the primary side of the transformer T1 is connected with an external single-phase power supply through a lead.

3. The pulverized coal fired boiler control system according to claim 2, characterized in that: the secondary side of the transformer T1 is connected with the alternating current input end of a rectifier bridge chip U1 through a wire, the direct current output end of the rectifier bridge chip U1 is connected with a pin No. 1 of a high-frequency boosting transformer T2 through a wire, and the first branch of the pin No. 2 of the high-frequency boosting transformer T2 is connected with the drain electrode of a MOS tube Q1 through a wire.

4. A pulverized coal fired boiler control system as defined in claim 3, characterized in that: the second branch is connected with the pin No. 1 of the high-frequency boosting transformer T2 through a diode D1 and a capacitor C3, the cathode of the diode D1 is connected with the pin No. 1 of the high-frequency boosting transformer T2 through a resistor R1, and the source of the MOS transistor Q1 is grounded.

5. The pulverized coal fired boiler control system according to claim 4, characterized in that: the No. 4 pin of the high-frequency boosting transformer T2 is connected with the anode of a diode D2 through a lead, the first branch of the cathode of the diode D2 is connected with the No. 3 pin of the high-frequency boosting transformer T2 through a capacitor C2, the second branch is connected with one end of a spark discharger HF through a lead, the other end of the spark discharger HF is connected with one end of the primary side of a high-frequency coupling transformer T3 through a lead, and the other end of the primary side of the high-frequency coupling transformer T3 is connected with the No. 3 pin of the high-frequency boosting transformer T2 through a lead.

6. The pulverized coal fired boiler control system according to claim 5, characterized in that: the direct current voltage regulating module adopts a Siemens direct current device 6RA70, and the PLC control module adopts a PLC model FR-FX2 NC.