CN111829004B - Electronic proportion adjustment combustion control method and control device - Google Patents
Electronic proportion adjustment combustion control method and control device Download PDFInfo
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- CN111829004B CN111829004B CN202010491113.1A CN202010491113A CN111829004B CN 111829004 B CN111829004 B CN 111829004B CN 202010491113 A CN202010491113 A CN 202010491113A CN 111829004 B CN111829004 B CN 111829004B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23N—REGULATING OR CONTROLLING COMBUSTION
- F23N5/00—Systems for controlling combustion
- F23N5/26—Details
- F23N5/265—Details using electronic means
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23N—REGULATING OR CONTROLLING COMBUSTION
- F23N5/00—Systems for controlling combustion
- F23N5/24—Preventing development of abnormal or undesired conditions, i.e. safety arrangements
- F23N5/242—Preventing development of abnormal or undesired conditions, i.e. safety arrangements using electronic means
Abstract
The invention discloses an electronic proportion adjusting combustion control method and a control device, wherein after receiving a furnace starting signal, the control device reads boiler parameters, judges whether the gas pressure, the state of a combustion adjusting valve and the state of a fan executing mechanism meet the requirements, and under the condition of meeting the requirements, controls a throttle valve, a fan and a corresponding valve for recycling smoke to be zeroed, carries out the leakage detection, the front purging and the ignition process, and in the control process from furnace starting to furnace stopping, after outputting a signal for controlling the executing mechanism, detects whether the corresponding executing mechanism reaches the target state or not, and if the target state is not reached, the furnace stopping is alarmed, thereby realizing the complete operation of the boiler combustion process.
Description
Technical Field
The invention relates to the technical field of boiler control, in particular to an electronic proportion adjustment combustion control method and a control device.
Background
The safety control of the boiler is an important matter, and related to the life and property safety of people, the main task of the boiler equipment is to provide steam with certain pressure or temperature according to the requirement of load, and the boiler is required to operate under safe and economic conditions, so that each process parameter in the production process must be strictly controlled. The large boiler is a complex controlled device, and the controlled variable and the manipulated variable are numerous and interrelated, and belong to a multivariable coupling object. The boiler combustion control is one of main control systems of boiler equipment, and optional control variables comprise combustion quantity, air supply quantity and air intake quantity, the control scheme is used for meeting the heat generated by combustion, adapting to the steam load requirement, keeping a certain ratio between combustion and air, ensuring the economy of combustion and the safe operation of the boiler, adapting the air intake quantity and the air supply quantity, keeping the negative pressure of a hearth in a certain range, and realizing the safe control of the combustion of the boiler, so that the operation of the boiler is safe and economical, and the problem to be solved is urgently.
Disclosure of Invention
The invention aims to provide an electronic proportion adjustment combustion control method and a control device, which start to control the actions of valves after receiving a furnace starting signal, detect whether the valves reach a preset state, enter a boiler for combustion when the target state is the same as the actual state, ensure that the electronic proportion adjustment combustion state reaches the target, and realize the safe and economic operation of the boiler.
The above object of the present invention is achieved by the following technical solutions:
after sending a furnace starting signal, reading boiler parameters, checking whether the gas pressure meets the requirement, and judging whether the target state of each valve is consistent with the monitoring feedback result; under the condition that the monitoring result is normal, carrying out leak detection and front purging, detecting whether the state of a gas valve meets the requirement or not, executing an ignition program when all the states are normal, adjusting the opening of each valve to control in the combustion process, and executing rear purging after the furnace is stopped; in the process from starting to stopping, detecting the actual state of each valve, monitoring whether the actual state of each valve is a target state, and alarming and stopping when the actual state of each valve is not matched with the target state.
The invention is further provided with: an electronic proportional control combustion control method comprising the steps of:
a1, starting a furnace;
a2, reading boiler parameters;
a3, judging whether the gas pressure meets the requirement, if so, entering the next step, and if not, giving an alarm;
a4, judging whether the target state of the valve is consistent with the feedback state, if so, entering the next step, and if not, giving an alarm;
a5, entering a leak detection process;
a6, entering a pre-purging process;
a7, judging whether the state of the gas valve meets a set target, if not, entering the next step, and if so, entering an ignition process to carry out load adjustment;
a8, alarming and stopping the furnace;
a9, entering a post-purging process.
The invention is further provided with: in the step A1, the furnace starting comprises manual furnace starting and automatic furnace starting, wherein the manual furnace starting can be performed only after a manual furnace starting signal is received; the automatic furnace starting is automatically performed by an electronic proportion adjusting control system.
The invention is further provided with: the leak detection process comprises the following steps:
b1, starting leak detection;
b2, initializing parameters;
b3, opening a second main air valve, and closing after the second leakage detection is continued for a set period of time;
b4, delaying the third leak detection set time;
b5, judging whether the leak detection pressure is greater than a first leak detection pressure set value, if not, entering the next step, if so, carrying out leak detection fault alarming, and ending;
b6, opening a first main air valve, and closing after the first leakage detection is continued for a set period of time;
b7, delaying the fourth leak detection set time;
and B8, judging whether the leak detection pressure is greater than a second leak detection pressure set value, if so, ending the leak detection, entering a pre-purging process, and if not, giving an alarm about leak detection faults, and ending the process.
The invention is further provided with: the pre-purge process includes the steps of:
c1, purging before starting;
c2, detecting whether the opening of the air door is in a first air door state, if so, entering the next step, and if not, turning to C12;
c3, starting the fan, and controlling the fan and the air door to be opened to a maximum state;
c4, delaying the first front purging time;
c5, detecting whether the air door is opened to the maximum state, if so, entering the next step, and if not, turning to C12;
c6, detecting whether the wind pressure is normal, if so, entering the next step, and if not, turning to C12;
c7, opening the ignition valve for exhausting, and closing the ignition valve after delaying for setting the exhaust time length;
c8, delaying the second front purging time period;
c9, detecting whether the flame detection loop is correct, if so, entering the next step, and if not, turning to C12;
c10, opening an air door and a fan to an ignition state;
c11, detecting whether the air door and the fan are in an ignition state, if not, entering the next step, and if so, ending the front purging and preparing to enter an ignition process;
and C12, alarming and stopping the furnace.
The invention is further provided with: the ignition process comprises the following steps:
d1, adjusting a gas valve to an ignition state;
d2, detecting whether the gas valve is in an ignition state, if so, entering the next step, and if not, turning to D14;
d3, igniting by an ignition transformer;
d4, delaying the first ignition to set the duration;
d5, opening an ignition valve;
d6, delaying a second ignition set time;
d7, detecting whether the flame meets the requirements, if so, entering the next step, and if not, turning to D14;
d8, delaying the third ignition to set the duration;
d9, opening the first main air valve and the second main air valve, and delaying a fourth ignition duration;
d10, detecting main flames, judging whether the main flames are stable or not, if yes, entering the next step, and if not, turning to D14;
d11, adjusting the gas valve to a minimum load state;
d12, delaying a fifth ignition set time length;
d13, closing the ignition transformer and the ignition valve, and ending the ignition;
and D14, alarming and stopping the furnace.
The invention is further provided with: the post-purge process includes the steps of:
w1, closing a main air valve group;
w2, opening the air door to a maximum state;
w3, purging after starting;
w4, waiting for a set purging time period;
w5, closing the air door to the lowest state;
w6, prohibiting the fan from running.
The invention is further provided with: according to each parameter, the opening degree of each valve is adjusted, including throttle opening degree adjustment, gas opening degree adjustment, flue gas recirculation opening degree adjustment and variable frequency fan percentage adjustment, and according to the actual load value of each actuator valve, N sections of tracking adjustment are carried out.
The invention is further provided with: according to the load adjustment, the following formula is adopted: each parameter adjustment value=slope×actuator actual load value+constant, wherein damper opening adjustment value=slope 1×actuator actual load value+constant 1; gas opening adjustment value = slope 2 actuator actual load value + constant 2; flue gas recirculation opening adjustment value = slope 3 actuator actual load value + constant 3; variable frequency fan percentage adjustment value = slope 4 actuator actual load value + constant 4.
The above object of the present invention is achieved by the following technical solutions:
an electronic proportional control combustion control device is characterized in that: comprising a memory and a processor, said memory storing a computer program for said electronic proportioning combustion control method that can be loaded and executed by the processor.
The invention is further provided with: the flame detection device comprises a master controller, a slave controller, an input circuit, an output circuit, a flame detection circuit and a communication circuit; the main controller outputs corresponding control signals to each valve executing structure through an output circuit, the input circuit detects the actual state of each executing structure to the main controller or/and the slave controller, after receiving the furnace starting signal, the main controller outputs corresponding control signals to control a fan, an ignition transformer, an ignition valve and main air valve equipment through the output circuit, meanwhile, whether each executing device reaches a target state or not is detected, the detection result is transmitted to the main controller or/and the slave controller, the main controller reads the actual state parameters of the valve executing structure through a communication circuit and the slave controller, whether the actual state is the same as the target state or not is judged, and alarm and furnace stopping signals are given when the actual state is different from the target state.
Compared with the prior art, the invention has the beneficial technical effects that:
1. according to the electronic proportion adjustment combustion control method, after the furnace is started, control signals are output, and whether all valve executing mechanisms reach a target state is detected, so that the realization of a boiler control result is ensured;
2. further, the method always detects the gas pressure, the wind pressure and the flame in the electronic proportion adjusting combustion process, so that the safety of boiler combustion is ensured;
3. further, when the method detects that the valve actuating mechanism of the boiler does not reach the target state, alarming and stopping the boiler, so that the safety of the boiler is maintained;
4. according to the device, the master controller is used for reading the actual state parameters of the boiler from the slave controller in the operation process of the boiler, so that the operation safety of the boiler is ensured.
Drawings
FIG. 1 is a schematic overall flow diagram of a control method according to an embodiment of the present invention;
FIG. 2 is a schematic flow diagram of a leak detection control method in accordance with one embodiment of the invention;
FIG. 3 is a schematic flow diagram of a pre-purge control method in accordance with an embodiment of the present invention;
FIG. 4 is a flow chart of an ignition control method according to an embodiment of the present invention;
FIG. 5 is a schematic flow diagram of a post purge control method in accordance with one embodiment of the invention;
fig. 6 is a schematic structural diagram of a control device according to an embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
Detailed description of the preferred embodiments
The invention discloses an electronic proportion adjustment combustion control method, which is shown in figure 1 and comprises the following steps: a1, starting a furnace;
a2, reading boiler parameters;
a3, judging whether the gas pressure meets the requirement, if so, entering the next step, and if not, giving an alarm;
a4, judging whether the target state of the valve is consistent with the feedback state, if so, entering the next step, and if not, giving an alarm;
a5, entering a leak detection process;
a6, entering a pre-purging process;
a7, judging whether the state of the gas valve meets a set target, if not, entering the next step, and if so, entering an ignition process to carry out load adjustment;
a8, alarming and stopping the furnace;
a9, entering a post-purging process.
After receiving the furnace starting signal, the control device reads the boiler parameters including the gas pressure, the state of the combustion regulating valve and the state of the fan executing mechanism, judges whether the gas pressure meets the requirement, whether the actual state of the combustion regulating valve is consistent with the target state, and whether the actual state of the fan executing mechanism is consistent with the target state, and gives an alarm when the gas pressure exceeds the gas pressure threshold range; and alarming when the actual state of the combustion regulating valve is inconsistent with the target state or/and the actual state of the fan executing mechanism is inconsistent with the target state.
And after meeting the requirements, outputting air door, air valve, fan and Flue Gas Recirculation (FGR) control signals to control each corresponding valve to return to zero.
The automatic furnace starting signal is automatically given by a boiler control system.
After the manual furnace starting control button is started, the manual furnace starting can be performed.
And when the gas pressure is in the gas pressure threshold range, the actual state of the combustion regulating valve is consistent with the target state, and the actual state of the fan executing mechanism is consistent with the target state, entering a leakage detection process, and detecting whether the main gas valve group leaks.
After the main air valve group is airtight, the main air valve group enters a front purging process, and the coal dust and combustible gas which are possibly accumulated in a hearth, a flue, an air preheater and the like and are incompletely combusted are discharged, so that deflagration is prevented from occurring during ignition.
After the front purging is finished, whether the state of the gas valve meets the requirement is detected, the gas valve is in a low position before ignition is not carried out, and if the gas valve is not in the low position, an alarm is given.
When the gas valve is in a low position, the ignition process is carried out, the states of 2 main gas valves, the ignition valve and the ignition transformer are detected in the ignition process, and flame detection is carried out.
After ignition, load adjustment is performed as required, and a load adjustment program is executed.
And when the alarm information is generated, controlling the boiler to stop working, and executing the post-purging process.
In the process from starting to stopping, after a control signal for controlling the execution mechanism is output, detecting whether the execution mechanism reaches a target state, if not, alarming to stop the furnace, and if so, entering the next step.
In the whole process, the gas pressure and the wind pressure are always detected, and the flame state is always detected after ignition.
Second embodiment
The leak detection control process in the electronic proportion adjustment combustion control method of the invention, as shown in fig. 2, comprises the following steps:
b1, starting leak detection;
b2, initializing parameters;
b3, opening a second main air valve, and closing after the second leakage detection is continued for a set period of time;
b4, delaying the third leak detection set time;
b5, judging whether the leak detection pressure is greater than a first leak detection pressure set value, if not, entering the next step, if so, carrying out leak detection fault alarming, and ending;
b6, opening a first main air valve, and closing after the first leakage detection is continued for a set period of time;
b7, delaying the fourth leak detection set time;
and B8, judging whether the leak detection pressure is greater than a second leak detection pressure set value, if so, ending the leak detection, entering a front purging, and if not, alarming the leak detection fault, and ending the process.
Detecting whether the main air valve has air leakage, firstly opening the main air valve 2, closing after the duration of T2, removing), continuing to detect the leakage detection pressure after closing for the duration of T3, judging whether the leakage detection pressure is larger than a first leakage detection pressure set value, alarming if yes, opening the main air valve 1 for air inflation, closing after the duration of T1, continuing to close for the duration of T4, detecting the leakage detection pressure, judging whether the leakage detection pressure is larger than a second leakage detection pressure set value, alarming if no, and entering a front purging if yes. Detailed description of the preferred embodiments
The front purge control process in the electronic proportional control combustion control method of the present invention, as shown in fig. 3, comprises the steps of:
c1, purging before starting;
c2, detecting whether the opening of the air door is in a first air door state, if so, entering the next step, and if not, turning to C12;
c3, starting the fan, and controlling the fan and the air door to be opened to a maximum state;
c4, delaying the first front purging time;
c5, detecting whether the air door is opened to the maximum state, if so, entering the next step, and if not, turning to C12;
c6, detecting whether the wind pressure is normal, if so, entering the next step, and if not, turning to C12;
c7, opening the ignition valve for exhausting, and closing the ignition valve after delaying for setting the exhaust time length;
c8, delaying the second front purging time period;
c9, detecting whether the flame detection loop is correct, if so, entering the next step, and if not, turning to C12;
c10, opening an air door and a fan to an ignition state;
c11, detecting whether the air door and the fan are in an ignition state, if not, entering the next step, and if so, ending the front purging;
and C12, alarming and stopping the furnace.
Specifically, the air door closing limit switch is detected to be in an effective state, a fan starting signal is output, the fan and the air door are started to the maximum, if the variable frequency fan is adopted, the control signal of the variable frequency fan is 20MA, after the set time of the variable frequency fan is continued to be T11, the air door is closed, the air pressure switch is detected to be opened, the limit switch is detected to be in an effective state, if yes, the ignition valve is opened, after the purging time is continued to be before T12, the ignition valve is closed, and the air exhaust is completed. And then preparing for ignition, outputting a control signal to control whether a flame detection hardware circuit is good, if so, outputting an air door opening signal and a fan signal to control the air door and the fan to an ignition state, detecting whether the actual state of the air door and the fan is the ignition state, and continuing to enter ignition after the time length is set in the condition that the state of the air door and the fan is in place.
Limit switches are respectively arranged at the maximum position and the minimum position of the air door so as to limit the maximum opening and the minimum opening of the air door, and the limit switches correspond to the opening or closing of the air door, when the limit switches are in an effective state, the opening of the air door is the maximum or the minimum.
Detailed description of the preferred embodiments
The ignition control process in the electronic proportional control combustion control method of the present invention, as shown in fig. 4, includes the steps of:
d1, adjusting a gas valve to an ignition state;
d2, detecting whether the gas valve is in an ignition state, if so, entering the next step, and if not, turning to D14;
d3, igniting by an ignition transformer;
d4, delaying the first ignition to set the duration;
d5, opening an ignition valve;
d6, delaying a second ignition set time;
d7, detecting whether the flame meets the requirements, if so, entering the next step, and if not, turning to D14; d8, delaying the third ignition to set the duration;
d9, opening the first main air valve and the second main air valve, and delaying a fourth ignition duration;
d10, detecting main flames, judging whether the main flames are stable or not, if yes, entering the next step, and if not, turning to D14;
d11, adjusting the gas valve to a minimum load state;
d12, delaying a fifth ignition set time length;
d13, closing the ignition transformer and the ignition valve, and ending the ignition;
and D14, alarming and stopping the furnace.
In the ignition process, a control signal is output to adjust the gas valve to an ignition position, whether the gas valve is in place is detected, and when the gas valve is in the ignition position, the ignition transformer is controlled to ignite, and the time duration is set for T21; after the ignition valve is controlled to be opened and the set time duration is kept T22, detecting flame and judging whether the flame reaches the set state or not; if not, alarming and stopping the furnace, if yes, continuously opening 2 main air valves after the time length is set by T23; simultaneously detecting whether 2 main air valves reach a target position, if not, alarming and stopping the furnace, and if so, continuing to set the time length by T24; detecting whether flame is stable or not, if not, alarming and stopping the furnace, and if so, adjusting the gas valve to a minimum load state or a set state, and continuing the T25 set time; and closing the ignition valve and the ignition transformer.
In the above embodiments, all are performed in the presence of an ignition valve, and if the ignition valve is not installed on the boiler apparatus, the relevant steps of directly skipping the ignition valve are performed.
Detailed description of the preferred embodiments
In the electronic proportion adjusting combustion control method, after ignition is finished, a load adjusting program is executed, and according to the outlet air temperature of the boiler and corresponding adjusting parameters, the valves are adjusted.
The opening of the valve is divided into 10 sections, and the opening of each valve is correspondingly adjusted, including throttle opening adjustment, gas opening adjustment, flue gas recirculation opening adjustment and variable frequency fan percentage adjustment, and tracking adjustment is carried out according to the actual load value of each actuator valve.
Load adjustment was performed according to the following formula: each parameter adjustment value = slope =actuator actual load value + constant;
wherein, throttle opening adjustment value = slope 1 actuator actual load value + constant 1; gas opening adjustment value = slope 2 actuator actual load value + constant 2; flue gas recirculation opening adjustment value = slope 3 actuator actual load value + constant 3; variable frequency fan percentage adjustment value = slope 4 actuator actual load value + constant 4.
According to the adjusting curve, the corresponding rest parameters are calculated by referring to the gas percentage, and the valve is adjusted in a graded increasing or decreasing mode.
The output percentage of the load is calculated through a Proportional Integral Derivative (PID) regulating curve, and the output percentage of the load corresponds to the output percentage of other parameters, such as the analog output percentage of the fuel gas, the fan and the air door.
The load comprises the output and the electric power of the boiler.
If the gas valve is increased by 0.5% in 1 second, the rest corresponding valves are correspondingly adjusted according to the adjusting curve.
Description of the preferred embodiments
The post purge control process in the electronic proportional control combustion control method of the present invention, as shown in fig. 5, comprises the steps of:
w1, closing a main air valve group;
w2, opening the air door to a maximum state;
w3, purging after starting;
w4, waiting for a set purging time period;
w5, closing the air door to the lowest state;
w6, prohibiting the fan from running.
After stopping the boiler, closing the main air valve group, namely the main air valve 1, the main air valve 2 and the gas valve, opening the air door to the maximum position, purging, continuously discharging residual combustible gas in the boiler into the atmosphere for a period of T31, and after the completion, closing the air door to the minimum state, and stopping the operation of the fan.
Description of the preferred embodiments
An electronic proportioning combustion control apparatus of the present invention includes a memory storing a computer program of an electronic proportioning combustion control method that can be loaded and executed by a processor, and a processor.
Specifically, as shown in fig. 6, the device comprises a master controller, a slave controller, a digital input circuit (DI), a digital output circuit (DO), an analog input circuit (AI), an analog output circuit (AO), a CAN communication circuit, a 232 communication circuit and a flame detection circuit, wherein the input circuit comprises the digital input circuit (DI) and the analog input circuit (AI), the output circuit comprises the digital output circuit (DO) and the analog output circuit (AO), and the communication circuit comprises the CAN communication circuit and the 232 communication circuit.
The master controller is respectively connected with the digital input circuit (DI), the digital output circuit (DO), the analog input circuit (AI), the analog output circuit (AO), the CAN communication circuit, the 232 communication circuit and the flame detection circuit, and the slave controller is respectively connected with the digital input circuit (DI), the digital output circuit (DO), the CAN communication circuit and the flame detection circuit.
After receiving the furnace starting signal, the main controller outputs corresponding control signals to control the fan, the ignition transformer, the ignition valve and the main air valve device through the output circuit, meanwhile, the digital input circuit detects whether each executing device reaches a target state or not, the detection result is transmitted to the main controller or/and the slave controller, the main controller reads actual state parameters of the valve executing structure through the CAN communication circuit and the slave controller, judges whether the actual state is the same as the target state or not, and gives alarm and furnace stopping signals when the actual state is different from the target state.
The digital input signals comprise control signals and state signals, wherein the control signals comprise manual control signals for starting and stopping the furnace, emergency and stopping the furnace and fault resetting, the state signals comprise state quantity signals for detecting leakage detection, high gas pressure, low gas pressure, wind pressure and wind pressure switches, the digital quantity input circuit signals are simultaneously supplied to the master controller and the slave controller, the master controller reads the target state signals of the digital quantities in the slave controller through the CAN communication circuit, compares the actual states of the digital quantities with the target states, and gives out alarm and furnace shutdown signals when the actual states of the digital quantities are different.
The communication circuit comprises a first communication circuit and a second communication circuit, wherein the first communication circuit is simultaneously connected with the master controller and the slave controller and is used for data communication between the master controller and the slave controller; the second communication circuit is connected between the main controller and the upper computer and is used for realizing the communication between the upper computer and the main controller. The control process of the application is as follows:
after receiving the furnace starting signal, detecting whether the gas pressure meets the requirement, outputting a digital quantity control signal to a corresponding executing mechanism by a main controller, executing the leakage detection and the front purging processes, receiving feedback signals of the executing mechanisms, judging whether the actual state of each executing mechanism is consistent with the target state, executing ignition under the condition that the actual state meets the requirement, outputting an analog quantity control signal, adopting proportional integral differential calculation according to the output requirement of the boiler, correspondingly controlling the opening of each valve after determining a certain parameter, such as the opening parameter of a gas valve, and simultaneously detecting whether the actual state of each analog quantity executing mechanism is consistent with the target state. And in the control process, if the actual state of a certain executing mechanism is detected to be inconsistent with the target state or a certain parameter is detected to be inconsistent with the requirement, alarming in time and stopping the furnace.
And after receiving the furnace shutdown signal, closing the main air valve group, executing the post-purging process, and closing the fan and the air door.
The embodiments of the present invention are all preferred embodiments of the present invention, and are not intended to limit the scope of the present invention in this way, therefore: all equivalent changes in structure, shape and principle of the invention should be covered in the scope of protection of the invention.
Claims (9)
1. An electronic proportion adjustment combustion control method is characterized in that: after sending a furnace starting signal, reading boiler parameters, checking whether the gas pressure meets the requirement, and judging whether the target state of each valve is consistent with the monitoring feedback result; under the condition that the monitoring result is normal, carrying out leak detection and front purging, detecting whether the state of a gas valve meets the requirement or not, executing an ignition program when all the states are normal, adjusting the opening of each valve to control in the combustion process, and executing rear purging after the furnace is stopped; after each control signal of one control executing mechanism is output from the start of the furnace to the stop of the furnace, detecting whether each executing mechanism reaches a target state, transmitting a detection result to a master controller or/and a slave controller, wherein the master controller reads actual state parameters of a valve executing structure through a CAN communication circuit and the slave controller, judges whether the actual state of each valve is the target state, enters the next step if the actual state of each valve reaches the target state, and alarms and stops the furnace if the actual state of one executing mechanism is detected to be inconsistent with the target state or the parameter is not consistent with the requirement in the control process;
the method comprises the following steps:
a1, starting a furnace;
a2, reading boiler parameters;
a3, judging whether the gas pressure meets the requirement, if so, entering the next step, and if not, carrying out alarm and furnace shutdown;
a4, judging whether the target state of the valve is consistent with the feedback state, if so, entering the next step, and if not, carrying out alarm and furnace shutdown;
a5, entering a leak detection process;
a6, entering a pre-purging process;
a7, judging whether the state of the gas valve meets a set target, if not, entering the next step, and if so, entering an ignition process to carry out load adjustment;
a8, alarming and stopping the furnace;
a9, entering a post-purging process;
wherein the ignition process comprises the following steps:
d1, adjusting a gas valve to an ignition state;
d2, detecting whether the gas valve is in an ignition state, if so, entering the next step, and if not, turning to D14;
d3, igniting by an ignition transformer;
d4, delaying the first ignition to set the duration;
d5, opening an ignition valve;
d6, delaying a second ignition set time;
d7, detecting whether the flame meets the requirements, if so, entering the next step, and if not, turning to D14;
d8, delaying the third ignition to set the duration;
d9, opening the first main air valve and the second main air valve, and delaying a fourth ignition duration;
d10, detecting main flames, judging whether the main flames are stable or not, if yes, entering the next step, and if not, turning to D14;
d11, adjusting the gas valve to a minimum load state;
d12, delaying a fifth ignition set time length;
d13, closing the ignition transformer and the ignition valve, and ending the ignition;
and D14, alarming and stopping the furnace.
2. The electronic proportioning combustion control method as set forth in claim 1, wherein: in the step A1, the furnace starting comprises manual furnace starting and automatic furnace starting, wherein the manual furnace starting can be performed only after a manual furnace starting signal is received; the automatic furnace starting is automatically carried out by a boiler control system.
3. The electronic proportioning combustion control method as set forth in claim 1, wherein: the leak detection process comprises the following steps:
b1, starting leak detection;
b2, initializing parameters;
b3, opening a second main air valve, and closing after the second leakage detection is continued for a set period of time;
b4, delaying the third leak detection set time;
b5, judging whether the leak detection pressure is greater than a first leak detection pressure set value, if not, entering the next step, if so, carrying out leak detection fault alarming, and ending;
b6, opening a first main air valve, and closing after the first leakage detection is continued for a set period of time;
b7, delaying the fourth leak detection set time;
and B8, judging whether the leak detection pressure is greater than a second leak detection pressure set value, if so, ending the leak detection, entering a pre-purging process, and if not, giving an alarm about leak detection faults, and ending the process.
4. The electronic proportioning combustion control method as set forth in claim 1, wherein: the pre-purge process includes the steps of:
c1, purging before starting;
c2, detecting whether the opening of the air door is in a first air door state, if so, entering the next step, and if not, turning to C12;
c3, starting the fan, and controlling the fan and the air door to be opened to a maximum state;
c4, delaying the first front purging time;
c5, detecting whether the air door is opened to the maximum state, if so, entering the next step, and if not, turning to C12;
c6, detecting whether the wind pressure is normal, if so, entering the next step, and if not, turning to C12;
c7, opening the ignition valve for exhausting, and closing the ignition valve after delaying for setting the exhaust time length;
c8, delaying the second front purging time period;
c9, detecting whether the flame detection loop is correct, if so, entering the next step, and if not, turning to C12;
c10, opening an air door and a fan to an ignition state;
c11, detecting whether the air door and the fan are in an ignition state, if not, entering the next step, and if so, ending the front purging and preparing to enter an ignition process;
and C12, alarming and stopping the furnace.
5. The electronic proportioning combustion control method as set forth in claim 1, wherein: the post-purge process includes the steps of:
w1, closing a main air valve group;
w2, opening the air door to a maximum state;
w3, purging after starting;
w4, waiting for a set purging time period;
w5, closing the air door to the lowest state;
w6, prohibiting the fan from running.
6. The electronic proportioning combustion control method as set forth in claim 1, wherein: according to each parameter, the opening degree of each valve is adjusted, including throttle opening degree adjustment, gas opening degree adjustment, flue gas recirculation opening degree adjustment and variable frequency fan percentage adjustment, and according to the actual load value of each actuator valve, N sections of tracking adjustment are carried out.
7. The electronic proportioning combustion control method as set forth in claim 6, wherein: according to the load adjustment, the following formula is adopted: each parameter adjustment value=slope×actuator actual load value+constant, wherein damper opening adjustment value=slope 1×actuator actual load value+constant 1; gas opening adjustment value = slope 2 actuator actual load value + constant 2; flue gas recirculation opening adjustment value = slope 3 actuator actual load value + constant 3; variable frequency fan percentage adjustment value = slope 4 actuator actual load value + constant 4.
8. An electronic proportional control combustion control device is characterized in that: comprising a memory and a processor, said memory storing a computer program capable of being loaded and executed by the processor for the method according to any of claims 1 to 7.
9. The electronic proportioning combustion control unit of claim 8 wherein: the flame detection device comprises a master controller, a slave controller, an input circuit, an output circuit, a flame detection circuit and a communication circuit; the main controller outputs corresponding control signals to each valve executing structure through an output circuit, the input circuit detects the actual state of each executing structure to the main controller or/and the slave controller, after receiving the furnace starting signal, the main controller outputs corresponding control signals to control a fan, an ignition transformer, an ignition valve and main air valve equipment through the output circuit, meanwhile, whether each executing device reaches a target state or not is detected, the detection result is transmitted to the main controller or/and the slave controller, the main controller reads the actual state parameters of the valve executing structure through a communication circuit and the slave controller, whether the actual state is the same as the target state or not is judged, and alarm and furnace stopping signals are given when the actual state is different from the target state.
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