WO2020224230A1 - Full-automatic cleaning method for pure oxygen combustor and cleaning control device thereof - Google Patents

Abstract

The present invention provides a full-automatic cleaning method for a pure oxygen combustor and a cleaning control device thereof. Said method comprises: a combustor conducting an ignition starting step, a high-temperature mode starting step, a gun cleaning mode starting step, a fuel shutdown mode starting step, a combustor cleaning starting step, and a combustor restarting mode starting step. During the cleaning process of a pure oxygen combustor, switching between cleaning and running is effectively realized by means of a control system, an alarm step is set to improve the safety, the temperature of a melting furnace is sensed by means of a temperature sensor, and a flame detector monitors the flame state, so as to precisely implement a gun cleaning process in a high-temperature environment and facilitate manual operation by an operator; an oxygen flow is changed by means of an adjusting mechanism, so that the oxygen flow can completely oxidize impurities on a nozzle of the combustor; and the oxidation of pure oxygen can quickly clean up impurities blocked on the combustor, achieving gun cleaning without fluctuation in the melting furnace temperature and gun cleaning without stopping production. The invention shortens the time of combustor cleaning, reduces the intensity of combustor cleaning, and prolongs the service life of the combustor.

Description

Full-automatic cleaning method of pure oxygen burner and cleaning control device thereof Technical field

The invention relates to a pure oxygen burner for metal smelting, in particular to a fully automatic cleaning method for a pure oxygen burner and a cleaning control device thereof.

Background technique

During the use of existing metal smelting burners, splashing metal raw materials and volatile raw materials condense on the burner nozzle, causing deformation of the combustion flame. The deformed flame can easily damage the refractory materials of the furnace, and even burn out, causing the temperature to be difficult to control or not distributed. However, the existing operation method is to stop production and take out the burner, forcefully remove the attachments, damage the burner nozzle, cause nozzle deformation and many other disadvantages. The advantages of on-line cleaning of pure oxygen burners are obvious, including saving time and effort, no need to stop production, no need to cool down, and no process fluctuations. Therefore, an efficient, safe and stable cleaning method is urgently needed.

Summary of the invention

In order to solve the above problems, the present invention provides a fully automatic cleaning method of a pure oxygen burner and a cleaning control device thereof. It is easy to control and adjust, and can be used and cleaned up without disturbance during the production process.

In order to achieve the technical purpose, the technical solution of the present invention is: a fully automatic cleaning method for a pure oxygen burner, which is characterized in that it comprises the following steps:

S1: Start the ignition of the controller;

S2: After successful ignition according to the controller in step S1, according to the heating curve, control the furnace to reach the production temperature. The controller starts the high temperature mode;

S3: After the high temperature mode in step S2 is turned on, follow the program setting and start the gun cleaning mode when necessary;

S4: After the gun cleaning mode in step S3 is activated, the fuel shut-off mode is activated, and the fuel supply is shut down through the control system;

S5: After starting according to the fuel-off mode in step S4, the burner cleaning action starts.

S6: After the burner cleaning action in step S5 is completed, the burner restart mode is started.

The beneficial effect of the present invention is that during the cleaning process of the pure oxygen burner, the control system effectively realizes the switch between cleaning and operation, and the alarm step is set to improve the safety, and then the temperature sensor is used to sense the temperature of the furnace, and the flame detector The flame status is monitored to accurately realize the gun cleaning process in high temperature environments, and at the same time, it is convenient for the operator to operate manually, and realizes automatic cleaning without stopping the machine.

In a preferred embodiment of the present invention, on the basis of the foregoing, the step S1 to start the ignition of the controller includes the following steps:

A1: The controller is powered on. If there is an error signal in the process of powering on the controller, the controller will reset;

A2: The security system is tested;

A3: After the safety system of A2 passes the test, the system enters the ready state and sends out an ignition signal;

A4: Spark plug ignition, open the ignition valve, flame signal monitoring, verify the ignition safety time;

A5: Open the main fire valve and monitor the flame signal;

A6: Main fire safety verification time. If no flame is detected and alarm, then go back to step A4;

A7: The main flame signal detection, the controller enters the operation stage, if there is no flame detected, an alarm; go back to step A4;

A8: The temperature control system controls fuel and oxygen to be adjusted according to a preset ratio.

Further, the activation of the high temperature mode in the controller in step S2 includes the following steps:

P1: When the temperature detected by the temperature sensor is greater than 750°C, the operator uses the high temperature start button to make the system enter the high temperature combustion mode, and the flame detection system stops running;

P2: When the temperature detected by the temperature sensor is lower than 750°C, go back to step A4.

Further, the process of starting the gun cleaning mode in step S3 includes the following steps:

T1: Detect whether the burner nozzle is blocked by splashing raw materials and volatile condensate in the furnace;

T2: According to the detection result of step T1, if the burner nozzle is blocked by the splashing raw materials and volatile condensate in the furnace, the burner enters the gun cleaning stage through the gun cleaning mode button.

Further, in the step S5, the starting process of the burner cleaning action includes the following steps:

E1: The control system provides oxygen supply at a predetermined flow rate, and the timer starts timing;

E2: The timer ends and the control system enters the standby state;

E3: After the control system enters the standby state, the oxygen supply maintains a flow rate of 20-60 cubic meters per hour to cool the burner;

E4: The operator presses the gun cleaning mode button again, and the system starts timing again;

E5: After the gun cleaning mode ends in step E4, the burner cleaning action ends.

Further, in the step S6, the action of the burner restart mode includes the following steps:

Q1: Press the button to resume combustion, and the control system will start the burner again;

Q2: When the temperature detected by the temperature sensor is lower than 750℃; go back to step A4;

Q3: When the temperature sensor detects that the temperature is higher than 750°C and the control selection is in high temperature mode, go back to step P1.

A cleaning control device for a pure oxygen burner, which is characterized in that it comprises:

The control unit is used to control the ignition of the controller;

The first temperature sensor unit is connected to the control unit for real-time detection of the temperature in the combustion furnace;

Oxygen flow control valve unit, connected to the control unit, used to control the oxygen flow through the burner;

Fuel flow control valve unit, connected to the control unit, used to control the fuel flow through the burner;

The temperature controller unit is respectively connected with the temperature sensor unit, oxygen flow control valve unit, and fuel flow control valve unit;

The second temperature sensor unit is connected to the temperature controller unit, and sends the detected real-time temperature to the temperature controller unit.

In actual operation, the oxygen flow control valve unit can set the gun cleaning flow bias, so that the oxygen flow will switch from the working flow to the gun cleaning flow immediately when the gun is cleaning, thereby generating a strong agitated oxygen flow and improving the cleaning efficiency .

Further, an alarm device is provided on the controller. The alarm device can be manually reset to achieve the function of multiple use.

Description of the drawings

Fig. 1 is a schematic diagram of the circuit module of the automatic cleaning method of the pure oxygen burner and the cleaning control device of the present invention.

Detailed ways

The technical solution of the present invention will be described clearly and completely below.

In order to solve the above problems, the present invention provides a fully automatic cleaning method of a pure oxygen burner and a cleaning control device thereof. It is easy to control and adjust, and can be used and cleaned up without disturbance during the production process.

In order to achieve the technical purpose, the technical solution of the present invention is: a full-automatic cleaning method and a cleaning control device for a pure oxygen burner, which is characterized in that it includes the following steps:

S1: Start the ignition of the controller;

S2: After successful ignition according to the controller in step S1, according to the heating curve, control the furnace to reach the production temperature. The controller starts the high temperature mode;

S3: After the high temperature mode in step S2 is turned on, follow the program setting and start the gun cleaning mode when necessary;

S4: After the gun cleaning mode in step S3 is activated, the fuel shut-off mode is activated, and the fuel supply is shut down through the control system;

S5: After starting according to the fuel-off mode in step S4, the burner cleaning action starts.

S6: After the burner cleaning action in step S5 is completed, the burner restart mode is activated.

The beneficial effect of the present invention is that during the cleaning process of the pure oxygen burner, the control system effectively realizes the switch between cleaning and operation, and the alarm step is set to improve the safety, and then the temperature sensor is used to sense the temperature of the furnace, and the flame detector The flame status is monitored to accurately realize the gun cleaning process in high temperature environments, and at the same time, it is convenient for the operator to operate manually, and realizes automatic cleaning without stopping the machine.

In a preferred embodiment of the present invention, on the basis of the foregoing, the step S1 to start the ignition of the controller includes the following steps:

A1: The controller is powered on. If there is an error signal in the process of powering on the controller, the controller will reset;

A2: The security system is tested;

A3: After the safety system of A2 passes the test, the system enters the ready state and sends out an ignition signal;

A4: Spark plug ignition, open the ignition valve, flame signal monitoring, verify the ignition safety time;

A5: Open the main fire valve and monitor the flame signal;

A6: Main fire safety verification time. If no flame is detected and alarm, then go back to step A4;

A7: The main flame signal detection, the controller enters the operation stage, if there is no flame detected, an alarm; go back to step A4;

A8: The temperature control system controls fuel and oxygen to be adjusted according to a preset ratio.

Further, the activation of the high temperature mode in the controller in step S2 includes the following steps:

P1: When the temperature detected by the temperature sensor is greater than 750°C, the operator uses the high temperature start button to make the system enter the high temperature combustion mode, and the flame detection system stops running;

P2: When the temperature detected by the temperature sensor is lower than 750°C, go back to step A4.

Further, the process of starting the gun cleaning mode in step S3 includes the following steps:

T1: Detect whether the burner nozzle is blocked by splashing raw materials and volatile condensate in the furnace;

T2: According to the detection result of step T1, if the burner nozzle is blocked by the splashing raw materials and volatile condensate in the furnace, the burner enters the gun cleaning stage through the gun cleaning mode button.

Further, in the step S5, the starting process of the burner cleaning action includes the following steps:

E1: The control system provides oxygen supply at a predetermined flow rate, and the timer starts timing;

E2: The timer ends and the control system enters the standby state;

E3: After the control system enters the standby state, the oxygen supply maintains a flow rate of 20-60 cubic meters per hour;

E4: The operator presses the gun cleaning mode button again, and the system starts timing again;

E5: After the gun cleaning mode ends in step E4, the burner cleaning action ends.

Further, in the step S6, the action of the burner restart mode includes the following steps:

Q1: Press the button to resume combustion, and the control system will start the burner again;

Q2: When the temperature detected by the temperature sensor is lower than 750℃; go back to step A4;

Q3: When the temperature sensor detects that the temperature is higher than 750°C and the control selection is in high temperature mode, go back to step P1.

A cleaning control device for a pure oxygen burner, which is characterized in that it comprises:

The control unit is used to control the ignition of the burner;

The first temperature sensor unit is connected to the control unit for real-time detection of the temperature in the combustion furnace;

Oxygen flow control valve unit, connected to the control unit, used to control the oxygen flow through the burner;

Fuel flow control valve unit, connected to the control unit, used to control the fuel flow through the burner;

The temperature controller unit is respectively connected with the temperature sensor unit, oxygen flow control valve unit, and fuel flow control valve unit;

The second temperature sensor unit is connected to the temperature controller unit, and sends the detected real-time temperature to the temperature controller unit.

In actual operation, the oxygen flow control valve unit can set the gun cleaning flow bias, so that the oxygen flow will switch from the working flow to the gun cleaning flow immediately when the gun is cleaning, thereby generating a strong agitated oxygen flow and improving the cleaning efficiency Further, an alarm device is provided on the controller. The alarm device can be reset manually to achieve the function of multiple use.

In actual operation, the control system starts the burner at normal temperature. During this combustion process, an ultraviolet flame detector is used. After the process temperature reaches the natural gas self-ignition temperature (1550°F/850°C), it switches to high-temperature combustion mode. After starting at room temperature, the fuel and oxygen are ignited by electric sparks, the flame is detected by the ultraviolet flame detector, and the main fire is ignited. When the temperature reaches a high temperature, it will automatically switch to the high temperature mode, the control system will stop the flame detection control mode and turn on the high temperature mode. Turn on the oxygen solenoid valve and fuel solenoid valve. Due to changes in combustion conditions, the opening of the oxygen flow valve is approximately closed by 10-20%, and the fuel flow valve is closed by 10-20%, keeping the oxygen-fuel ratio within a safe range. After the high temperature combustion control mode is activated, the control system no longer detects the flame detector signal. In the high temperature mode, start the burner cleaning program, the control system shuts down the fuel supply, and separately provides 50-500 cubic meters/hour of oxygen flow through the burner. The control system presets the gun cleaning mode for 10-120 seconds. The cleaning time can be recycled. Within this time range, furnace volatiles, furnace flow, and raw material splashes are rapidly oxidized by pure oxygen gas, and the structure becomes loose and directly removed. Or easier to be cleaned up.

For those of ordinary skill in the art, without departing from the inventive concept of the present invention, several modifications and improvements can be made, and these all fall within the protection scope of the present invention.

Claims (8)

1. A fully automatic cleaning method for a pure oxygen burner, which is characterized in that it comprises the following steps:

   S1: Start the ignition of the controller;

   S2: After successful ignition according to the controller in step S1, according to the heating curve, control the furnace to reach the production temperature. The controller starts the high temperature mode;

   S3: After the high temperature mode in step S2 is turned on, follow the program setting and start the gun cleaning mode when necessary;

   S4: After the gun cleaning mode in step S3 is activated, the fuel shut-off mode is activated, and the fuel supply is shut down through the control system;

   S5: After starting according to the fuel-off mode in step S4, the burner cleaning action starts.

   S6: After the burner cleaning action in step S5 is completed, the burner restart mode is started.
2. The full-automatic cleaning method of pure oxy-fuel burner according to claim 1, characterized in that: the step S1 starts the ignition of the controller, which comprises the following steps:

   A1: The controller is powered on. If there is an error signal in the process of powering on the controller, the controller will reset;

   A2: The security system is tested;

   A3: After the safety system of A2 passes the test, the system enters the ready state and sends out an ignition signal;

   A4: Spark plug ignition, open the ignition valve, flame signal monitoring, verify the ignition safety time;

   A5: Open the main fire valve and monitor the flame signal;

   A6: Main fire safety verification time. If no flame is detected and alarm, then go back to step A4;

   A7: The main flame signal detection, the controller enters the operation stage, if there is no flame detected, an alarm; go back to step A4;

   A8: The temperature control system controls fuel and oxygen to be adjusted according to a preset ratio.
3. The full-automatic cleaning method of a pure oxy-fuel burner according to claim 1, wherein the activation of the high temperature mode in the controller in step S2 includes the following steps:

   P1: When the temperature detected by the temperature sensor is greater than 750°C, the operator uses the high temperature start button to make the system enter the high temperature combustion mode, and the flame detection system stops running;

   P2: When the temperature detected by the temperature sensor is lower than 750°C, go back to step A4.
4. The full-automatic cleaning method of the pure oxy-fuel burner according to claim 1, wherein the starting process of the gun cleaning mode in step S3 includes the following steps:

   T1: Detect whether the burner nozzle is blocked by splashing raw materials and volatile condensate in the furnace;

   T2: According to the detection result of step T1, if the burner nozzle is blocked by the splashing raw materials and volatile condensate in the furnace, the burner enters the gun cleaning stage through the gun cleaning mode button.
5. The full-automatic cleaning method of pure oxy-fuel burner according to claim 1, characterized in that, in the step S5, the starting process of the burner cleaning action includes the following steps:

   E1: The control system provides oxygen supply at a predetermined flow rate, and the timer starts timing;

   E2: The timer ends and the control system enters the standby state;

   E3: After the control system enters the standby state, the oxygen supply maintains a flow rate of 20-60 cubic meters per hour to cool the burner;

   E4: The operator presses the gun cleaning mode button again, and the system starts timing again;

   E5: After the gun cleaning mode ends in step E4, the burner cleaning action ends.
6. The full-automatic cleaning method of pure oxy-fuel burner according to claim 1, characterized in that, in the step S6, the action of the burner restart mode includes the following steps:

   Q1: Press the button to resume combustion, and the control system will start the burner again;

   Q2: When the temperature detected by the temperature sensor is lower than 750℃; go back to step A4;

   Q3: When the temperature sensor detects that the temperature is higher than 750°C and the control selection is in high temperature mode, go back to step P1.
7. A cleaning control device for a pure oxygen burner, which is characterized in that it comprises:

   The control unit is used to control the ignition of the controller;

   The first temperature sensor unit is connected to the control unit for real-time detection of the temperature in the combustion furnace;

   Oxygen flow control valve unit, connected to the control unit, used to control the oxygen flow through the burner;

   Fuel flow control valve unit, connected to the control unit, used to control the fuel flow through the burner;

   The temperature controller unit is respectively connected with the temperature sensor unit, oxygen flow control valve unit, and fuel flow control valve unit;

   The second temperature sensor unit is connected to the temperature controller unit, and sends the detected real-time temperature to the temperature controller unit.

   The flame detector unit, connected to the control unit, is used to detect flames in normal temperature mode.
8. The cleaning control device for a pure oxy-fuel burner according to claim 6, wherein the controller is provided with an alarm device.

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