CN115751276A - Control system of gas boiler - Google Patents
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- 238000005457 optimization Methods 0.000 claims abstract description 70
- 239000007789 gas Substances 0.000 claims abstract description 60
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims abstract description 40
- 239000001301 oxygen Substances 0.000 claims abstract description 40
- 229910052760 oxygen Inorganic materials 0.000 claims abstract description 40
- 238000012544 monitoring process Methods 0.000 claims abstract description 16
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 80
- 238000000034 method Methods 0.000 claims description 21
- 230000008569 process Effects 0.000 claims description 20
- 239000003034 coal gas Substances 0.000 claims description 12
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims description 11
- 239000003546 flue gas Substances 0.000 claims description 11
- 230000009467 reduction Effects 0.000 claims description 10
- 230000033228 biological regulation Effects 0.000 claims description 9
- 238000012937 correction Methods 0.000 claims description 6
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- 230000004044 response Effects 0.000 abstract description 3
- 230000001105 regulatory effect Effects 0.000 description 7
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- 238000005516 engineering process Methods 0.000 description 3
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- 238000001514 detection method Methods 0.000 description 2
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- 230000010354 integration Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000000779 smoke Substances 0.000 description 2
- 206010063385 Intellectualisation Diseases 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
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- 230000003247 decreasing effect Effects 0.000 description 1
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- 238000010248 power generation Methods 0.000 description 1
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P90/00—Enabling technologies with a potential contribution to greenhouse gas [GHG] emissions mitigation
- Y02P90/02—Total factory control, e.g. smart factories, flexible manufacturing systems [FMS] or integrated manufacturing systems [IMS]
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Abstract
The invention relates to the technical field of boiler control, and particularly discloses a control system of a gas boiler, which comprises a DCS (distributed control system) control unit, an optimization control unit, an execution element for executing an optimization control instruction, a monitoring unit for monitoring the working state of the execution element in real time and an optimization control station, wherein the optimization control unit and the DCS control unit independently control the execution element, the monitoring unit transmits monitoring data to the DCS control unit and the optimization control unit, and the optimization control unit comprises a main steam temperature optimization control module, a bore pressure control module, an air supply oxygen amount control module, a combustion load control module and a machine furnace coordination control module; a plurality of monitoring signals are used as feedforward input, and corresponding optimized control instructions are calculated through a self-adaptive PID algorithm to control the running state of the boiler, so that the technical problem that the state is not timely changed due to response lag in the existing boiler control system is solved.
Description
Technical Field
The invention relates to the technical field of boiler control, in particular to a control system of a gas boiler.
Background
The gas boiler burns surplus blast furnace gas and converter gas, is used for generating electricity and reduces gas divergence. The existing boiler and steam turbine control is mostly controlled by adopting a DCS control system; the long-term stable and reliable operation of equipment is ensured, the intellectualization of the production process of the thermal power station is improved, the boiler combustion and the fine adjustment of a generator set are realized, the self-power consumption of the thermal power station is reduced, and the power generation efficiency of the thermal power station is improved; the pressure of the gas pipe network is ensured to be stable, the stability of using the gas by other gas users is improved, and meanwhile, the dispersion amount of the gas is reduced, so that the load of a boiler system is adjusted more quickly, and the boiler system is operated more safely, more stably and more economically.
The signal data fed back by each monitoring point in the existing DCS control system is subjected to PID calculation and then sends an instruction to control a corresponding execution element, the required parameter is calculated through a detection result, and the parameter is adjusted through an execution element, so that a time difference exists from the monitoring data to the adjustment in the process, and the parameter cannot be adjusted in time according to the change.
Disclosure of Invention
The invention aims to provide a control system of a gas boiler, which aims to solve the technical problem that the change state is not timely caused by response lag in the existing boiler control system.
In order to achieve the purpose, the invention provides the following basic scheme: the utility model provides a gas boiler's control system, includes DCS the control unit, optimizes the control unit, carries out the executive component of optimization control instruction, monitors the monitoring unit and the optimal control station of executive component operating condition in real time, through OPC/ModBus communication between optimal control unit and the DCS the control unit, through the ethernet communication between optimal control unit and the optimal control station, the optimal control station carries out programming control to the optimal control unit, optimal control unit and DCS the control unit individual control executive component, monitoring unit transmits monitoring data for DCS the control unit and optimal control unit, the optimal control unit includes steam pocket water level optimization control module, main vapour temperature optimization control module, furnace pressure control module, air supply oxygen volume control module, combustion load control module, machine stove coordination control module.
And the second scheme is the optimization of the basic scheme, the process of the drum water level optimization control module is to calculate the optimal value of the drum water level through a PID algorithm according to the current load of the boiler, calculate the deviation value of the optimal value of the drum water level and the set value of the drum water level through a regulator, set and monitor the optimal value of the drum water level, update the optimal value data in real time, update the deviation value of the optimal value of the drum water level and the set value of the drum water level through the regulator in real time, calculate the deviation value of the optimal value of the drum water level and the set value of the drum water level, intelligently correct the drum pressure and the data of the main steam flow, calculate the deviation value of the optimal value of the steam supply flow through the regulator, comprehensively calculate the optimal value of the drum water level and the intelligently corrected drum pressure, and give an instruction to control the opening degree of the water supply flow valve, thereby controlling the flow rate.
And a third scheme is the optimization of the second scheme, and the process of the drum water level optimization control module also comprises the step of directly sending an instruction to control the opening of the water supply flow valve after the integration of the deviation value of the drum water level optimization value and the drum water level set value and the main steam flow.
And fourthly, preferably selecting the basic scheme, wherein the main steam temperature optimal control module calculates a main steam temperature optimal value through a PID algorithm according to the load of the current boiler, the main steam temperature optimal value is processed by DIFF and then is subjected to fuzzy reasoning together with a main steam temperature set value through a main steam temperature main regulator, dynamic parameters of the main regulator are updated in real time, the dynamic parameters of the main regulator are combined with real-time data of the oxygen content of the smoke at the outlet of the superheater and the flow of the main steam as the output of the main regulator after being integrated with the temperature after the temperature reduction water valve, an optimal control instruction is given out after the real-time data of the oxygen content of the smoke at the outlet of the main steam temperature auxiliary regulator and the furnace outlet and the temperature after the temperature reduction water valve are integrated, and the opening of the temperature reduction water valve is controlled through the calculated optimal control instruction.
By taking the real-time data of the main steam flow, the oxygen content of the flue gas at the outlet of the superheater, the temperature at the outlet of the hearth and the oxygen content of the flue gas at the outlet of the hearth as feedforward, an optimized control instruction of the opening of the desuperheating water valve is calculated through a PID algorithm, the opening of the desuperheating water valve is adjusted in advance, the condition that the steam temperature responds to the instruction for adjusting the desuperheating water valve is delayed, the opening of the desuperheating water valve is not adjusted in time, the rapid and accurate adjustment of the desuperheating water is realized, and the automatic input rate of the desuperheating water adjusting valve is improved.
And after the total air quantity and the total fuel quantity are used as feedforward synthesis and are integrated with the deviation value of the hearth negative pressure optimal value and the hearth negative pressure set value, a hearth negative pressure control instruction is calculated through a PID algorithm, the opening of hearth air supply and gas valves is controlled, and the hearth air supply quantity and the gas quantity are controlled.
And a sixth scheme is the optimization of the basic scheme, and the process of the air supply oxygen control module is that real-time data of the coal gas amount is processed by FILT and then is calculated with original data to obtain the demand reference of the air supply amount, main steam flow is calculated and then is offset and integrated with a set value of HMI oxygen, then is integrated with an optimized value of oxygen calculated by PID algorithm, is calibrated and corrected by an oxygen regulator and then is integrated with the demand reference of the air supply amount, after integration, the demand of the air supply amount is offset and integrated with the set value of the air supply amount, the demand of the air supply amount is compared with a real-time measured value of the air supply amount, and then an optimized control instruction is calculated by an air volume regulator to control the air supply machine, the demand of the air supply amount is input into the air volume regulator as feedforward to regulate the size of the air supply amount.
The scheme seven is the optimization of the basic scheme, and the boiler-turbine coordination control module is divided into boiler control and steam turbine control; the boiler control process includes calculating deviation values of the optimized main steam pressure values and the set main steam pressure values through a PID algorithm, inputting the deviation values and original deviation values into the first regulator after fuzzy reasoning to calculate corresponding data signals, comprehensively calculating the oxygen content of the boiler and the content of CO in flue gas, then comprehensively calculating the oxygen content of the boiler and the pressure of the steam drum after intelligent correction, comprehensively calculating the calculated data and the data calculated in the first regulator, calculating deviation values with the optimized gas quantity values, and inputting the deviation values into the second regulator to calculate optimized control fingers of each layer of gas at the moment.
The air conditioner control process is that in the main steam pressure control mode, the opening degree of the high-pressure regulating valve is changed to maintain the pressure in front of the air conditioner at a desired target value, and the set value of the pressure in front of the air conditioner can be set by an operator;
under the pressure control mode, the steam turbine master control changes the opening degree of a main steam high-pressure speed regulation steam valve of the steam turbine according to the deviation between a main steam pressure set value subjected to rate limitation and the main steam pressure of the steam turbine so as to maintain the main steam pressure of the steam turbine equal to the set value;
under a coordination control mode, the steam turbine main control changes the opening degree of a main steam high-pressure speed regulation steam valve of the steam turbine according to a power instruction subjected to rate limitation and a CCS (control center) side primary frequency regulation instruction and a unit target load instruction subjected to rate limitation, so that the power of the unit is kept stable in a target load range.
Drawings
Fig. 1 is a schematic view of a control system of a gas boiler according to the present invention.
Fig. 2 is a schematic diagram of a drum level optimization control module in a control system of a gas boiler according to the present invention.
Fig. 3 is a schematic diagram of a main steam temperature optimization control module in a control system of a gas boiler according to the present invention.
Fig. 4 is a schematic view of a hearth pressure control module in the control system of the gas boiler according to the present invention.
FIG. 5 is a schematic diagram of an air supply oxygen control module in the control system of a gas boiler according to the present invention.
Fig. 6 is a schematic view of boiler control in a control system of a gas boiler according to the present invention.
Fig. 7 is a schematic view of steam turbine control in a control system of a gas boiler according to the present invention.
Detailed Description
The present invention will be described in further detail below by way of specific embodiments:
as shown in fig. 1: a control system of a gas boiler comprises a DCS control unit, an optimization control unit, an execution element and a monitoring unit, wherein the optimization control unit calculates an optimization control instruction according to a self-adaptive PID algorithm and real-time data provided by the DCS control unit, the execution element executes the optimization control instruction, the monitoring unit monitors the working state of the execution element in real time, the optimization control unit transmits the calculated optimization control instruction and the real-time data provided by the DCS system to an optimization control station in an Ethernet communication mode, and the optimization control unit is subjected to programming control through the optimization control station.
When the optimization control unit is switched in, the execution element receives an optimization instruction of the optimization control unit; when the optimization control unit is cut off, the executive component receives the command of the DCS control unit.
A communication detection function is designed between the optimization control unit and the DCS control unit to realize communication through Modbus/OPC, when the communication of the optimization control unit fails, the optimization control unit quits and gives an alarm, a control authority is given to the DCS control unit, and the switching of the DCS control unit and the optimization control system is undisturbed.
The optimization control unit comprises a steam drum water level optimization control module; a main steam temperature optimization control module; a hearth pressure control module; an air supply oxygen control module; and a machine-furnace coordination control module.
Steam drum water level optimization control module
As shown in fig. 2, the drum water level optimization control module calculates an optimal value of the drum water level through a PID algorithm according to the current load of the boiler, calculates a deviation value between the optimal value of the drum water level and a set value of the drum water level through a regulator, monitors the optimal value of the drum water level, updates optimal value data in real time, and updates the deviation value between the optimal value of the drum water level and the set value of the drum water level through the regulator in real time.
After the data of the steam drum water level optimal value, the steam drum pressure after intelligent correction and the main steam flow are synthesized, the deviation value between the optimal value and the water supply flow optimal value is calculated through a regulator, and then the deviation value and the water supply flow optimal value are comprehensively calculated with the steam drum pressure after intelligent correction, an instruction is given, and the opening degree of a water supply flow valve is controlled, so that the flow to which the steam is supplied is controlled, and the control process is realized.
In the other control process, the deviation value of the drum water level optimal value and the drum water level set value is integrated with the main steam flow, and then an instruction is directly sent out to control the opening of the water supply flow valve, and the two control processes are switched through the regulator to ensure the normal operation of the boiler.
And (3) comprehensively calculating the real-time data of the main steam flow, the drum pressure drum water level optimal value and the deviation value of the drum water level set value to obtain an optimal control instruction, and controlling the opening of the water supply flow valve so as to control the drum water level and avoid the drum water level from being changed falsely due to the variation of the drum pressure.
Main steam temperature optimizing control module
As shown in fig. 3, the main steam temperature optimization control module calculates a main steam temperature preferred value through a PID algorithm according to the load of the current boiler, the main steam temperature preferred value is subjected to DIFF processing and then is subjected to fuzzy reasoning together with a main steam temperature set value through a main steam temperature main regulator, dynamic parameters of the main regulator are updated in real time, the dynamic parameters of the main regulator are combined with real-time data of the oxygen content of the flue gas at the outlet of the superheater and the flow of the main steam to be used as the output of the main regulator and the temperature after the temperature reduction water valve, an optimization control instruction is given out after the real-time data of the oxygen content of the flue gas at the outlet of the main steam temperature auxiliary regulator and the flow of the hearth and the temperature after the temperature reduction water valve are comprehensively calculated, and the opening of the temperature reduction water valve is controlled through the calculated optimization control instruction.
By taking the real-time data of the main steam flow, the oxygen content of the flue gas at the outlet of the superheater, the temperature at the outlet of the hearth and the oxygen content of the flue gas at the outlet of the hearth as feedforward, an optimized control instruction of the opening of the desuperheating water valve is calculated through a PID algorithm, the opening of the desuperheating water valve is adjusted in advance, the condition that the steam temperature responds to the instruction for adjusting the desuperheating water valve is delayed, the opening of the desuperheating water valve is not adjusted in time, the rapid and accurate adjustment of the desuperheating water is realized, and the automatic input rate of the desuperheating water adjusting valve is improved.
Hearth pressure control module
As shown in fig. 4, the process of the hearth pressure control module is to calculate a hearth negative pressure preferred value through a PID algorithm according to the current load of the boiler, calculate a deviation value between the hearth negative pressure preferred value and a hearth negative pressure set value through a regulator, calculate a hearth negative pressure control instruction through a PID algorithm after synthesizing the total air volume and the total fuel volume as feedforward, the hearth negative pressure preferred value and the hearth negative pressure set value, control the opening of the hearth air supply and gas valve, and control the hearth air supply volume and the gas volume.
The hearth pressure control system module is used for maintaining the hearth pressure within an allowable range by adjusting two frequency converters (liquid coupling/baffle) of the induced draft fans and matching with an air supply system.
The hearth pressure is regulated and controlled by the air supply quantity and the gas quantity, the air supply quantity and the gas quantity form cross interlocking, and the air supply and the gas are limited when the hearth pressure is high; otherwise, air and gas reduction is limited, air induction feed-forward logic is optimized, and air induction quantity is directly controlled in an over-relaxation mode according to the gas quantity; according to the change of air supply, the induced air is controlled in a feedforward mode, the response speed of variable working conditions and variable loads is quickly met, meanwhile, stable adjustment and fine adjustment are achieved, the pressure target is reduced, the operation of a red line is pressed, and the unit consumption of an auxiliary machine is reduced.
Air supply oxygen control module
As shown in fig. 5, the process of the air supply oxygen control module is to calculate the demand standard of air supply amount by using real-time data of the amount of coal gas after FILT processing and raw data, calculate the main steam flow, offset and integrate the calculated main steam flow with the HMI oxygen set value, calculate the optimal oxygen value by using PID algorithm, calibrate and correct the main steam flow by using an oxygen regulator, integrate the main steam flow with the demand standard of air supply amount, offset and integrate the calculated demand of air supply amount with the set value of air supply amount, compare the air supply amount demand with the real-time measured value of air supply amount, calculate the optimal control command by using an air volume regulator, control the air supply machine, input the air supply amount demand into the air volume regulator as feedforward to regulate the air supply amount.
The air supply system adopts the air volume measured value as the measured value of air supply control, and the air volume corresponding to the gas volume as the reference value of air supply control. When the gas quantity is reduced, the corresponding air quantity set value is correspondingly reduced, and the air supply regulation sends out a command of reducing the opening degree of the throttle; when the gas quantity is increased, the corresponding air quantity set value is correspondingly increased, and the air supply regulation sends out an instruction of increasing the opening degree of the throttle.
On the basis that the gas quantity is converted into a reference value of the air quantity, an oxygen regulator is used for calibrating, and the reference value is corrected through the output of the oxygen regulator to form the final air quantity requirement. The set value of the oxygen regulator is adjusted in time along with the changes of the main steam flow and the coal gas volume, so that a reasonable oxygen volume range is maintained, and the economic combustion of the coal gas volume is realized.
The boiler-turbine coordination control module is divided into boiler control and turbine control;
boiler control
As shown in figure 6, the boiler control process comprises the steps of calculating a deviation value by a PID algorithm according to a main steam pressure preferred value and a main steam pressure set value, inputting the deviation value and an original deviation value into a first regulator after fuzzy reasoning to calculate a corresponding data signal, comprehensively calculating the oxygen content of the boiler and the content of CO in flue gas, then comprehensively calculating the calculated data and the calculated data in the first regulator and the gas quantity preferred value to calculate a deviation value, inputting the deviation value into a second regulator to calculate the optimal control command of each layer of gas at the moment
The main steam pressure control function adjusts main steam pressure mainly by changing the opening degree of a coal gas regulating valve, simultaneously adopts an intelligent feedforward mode of comprehensively considering the whole combustion field, considers the influence degree of each combustion related parameter on the main steam pressure difference, adopts a numerical analysis and modeling mode, converts each variable into the instruction requirement on the coal gas quantity to the disturbance condition of the main steam pressure, and ensures the stability of the main steam pressure.
Steam engine control
As shown in fig. 7, in the main steam pressure control mode, the set value of the pre-engine pressure can be set by an operator by changing the opening degree of the high-pressure regulating gate to maintain the pre-engine pressure at a desired target value.
Under the pressure control mode, the main control of the steam turbine changes the opening degree of a main steam high-pressure speed-regulating valve of the steam turbine according to the deviation between a main steam pressure set value subjected to rate limitation and the main steam pressure of the steam turbine so as to maintain the main steam pressure of the steam turbine equal to the set value.
Under a coordination control mode, the steam turbine main control changes the opening degree of a main steam high-pressure speed regulation steam valve of the steam turbine according to a power instruction subjected to rate limitation and a set target load instruction subjected to rate limitation by superposing a CCS (central control system) side primary frequency modulation instruction and the set target load instruction so as to maintain the power of the set to be stable in a target load range.
The implementation mode of the scheme is as follows: firstly, a combustion load control module is operated, and a total coal gas demand instruction is obtained through adjustment by using the actual main steam pressure and a pressure set value (a constant pressure design loop). The total coal gas demand instruction and the actual total coal gas amount are subjected to the regulating action and are evenly distributed to the instructions of the single coal gas branch pipe regulating valves. After the main steam pressure deviation is subjected to actual combustion capacity amplitude limiting, the differential action of the gas pressure and the gas flow and the like are superposed to participate in the adjustment of the regulator;
then operating a steam drum water level optimization control module, wherein the normal control of the steam drum water level is a three-impulse control system consisting of steam flow, steam drum water level and feed water flow, only the single-impulse control of the steam drum water level is realized during starting and low load, and undisturbed switching is realized between the single impulse and the three impulses;
then operating a main steam temperature control module, and adjusting the opening of a desuperheater valve according to the main steam temperature and the desuperheating water temperature to ensure that the main steam temperature reaches the designed temperature process, wherein the set value of the superheater temperature is automatically set by calculating load according to an operating curve or manually set;
and continuously operating the hearth pressure control module, and ensuring that the hearth negative pressure fluctuates within a set value range by adjusting the frequency conversion instruction of the induced draft fan. The method comprises the following steps that a blower instruction, the opening degree of a gas regulating valve, the gas flow and the gas pressure are subjected to first-order inertia and differential processing (dynamic compensation), saturation characteristic processing (limiting the amplitude of feedforward correction and ensuring the stability of negative pressure regulation) and then feedforward correction signals are made;
finally, the air supply oxygen control module is operated, and the total combustion air volume (air pressure) of the hearth is adjusted by increasing or decreasing the frequency of the air feeder so as to meet the air-fuel ratio of the boiler, so that the boiler can be fully combusted, and the oxygen content is ensured to be in a reasonable range; the oxygen amount set value can be automatically calculated according to the main steam of the unit, and the operating personnel can also adjust the oxygen amount set value within the range of 2-5 percent to change the total excess air amount; the water level of the deaerator is adjusted by changing the water inflow of the demineralized water, so that the water level is stabilized near a set value, and in order to avoid the influence of cavitation possibly caused on the demineralized water pump when the water replenishing valve is completely closed, the lowest opening of the built-in water replenishing valve of the APC optimization system is 8%;
the invention accurately controls the gas quantity according to the change of the external load demand by utilizing the technologies of predictive control, fuzzy control and soft measurement, and prevents the great main steam pressure fluctuation caused by under-regulation or over-regulation.
The invention ensures the optimal air and gas ratio by utilizing the predictive control, intelligent control and automatic optimization technology and ensures that the boiler efficiency is kept in the optimal state.
The invention utilizes the intelligent coordination control technology to prevent the main steam pressure and load fluctuation caused by the change of the gas pressure and the heat value.
The invention realizes automatic optimization operation: the labor intensity of operators is reduced, the safety production level is improved, and the quasi-unmanned operation of the related generation process is realized;
the invention realizes economic operation: the three-dimensional optimization of the proportion of gas and combustion-supporting air is realized on the basis of realizing the automatic combustion of the boiler so as to realize the most economic operation of the boiler;
the invention realizes more environment-friendly operation to a certain extent: the fuel can be fully combusted, and the environmental protection problem of incomplete combustion of coal gas can be solved to a certain extent;
the invention realizes the coordinated control of the machine furnace and meets the distribution requirements of the thermal and electric load instructions;
the invention stabilizes the operation of the boiler, improves the safety control level, improves the operation quality and meets the technical index requirements.
The foregoing is merely an example of the present invention and common general knowledge of known specific structures and features of the embodiments is not described herein in any greater detail. It should be noted that, for those skilled in the art, without departing from the structure of the present invention, several changes and modifications can be made, which should also be regarded as the protection scope of the present invention, and these will not affect the effect of the implementation of the present invention and the practicability of the patent. The scope of the claims of the present application shall be determined by the contents of the claims, and the description of the embodiments and the like in the specification shall be used to explain the contents of the claims.
Claims (8)
1. The control system of the gas boiler is characterized by comprising a DCS (distributed control system) control unit, an optimization control unit, an execution element for executing an optimization control instruction, a monitoring unit for monitoring the working state of the execution element in real time and an optimization control station, wherein the optimization control unit is communicated with the DCS control unit through OPC/ModBus, the optimization control unit is communicated with the optimization control station through Ethernet, the optimization control station performs programming control on the optimization control unit, the optimization control unit and the DCS control unit independently control the execution element, the monitoring unit transmits monitoring data to the DCS control unit and the optimization control unit, and the optimization control unit comprises a steam drum water level optimization control module, a main steam temperature optimization control module, a hearth pressure control module, an air supply oxygen amount control module and a boiler coordination control module.
2. The control system of the gas boiler as set forth in claim 1, wherein the process of the drum water level optimizing control module is to calculate a preferred value of the drum water level through a PID algorithm according to a current load of the boiler, calculate a deviation value of the preferred value of the drum water level and a set value of the drum water level through a regulator, monitor the preferred value of the drum water level, update preferred value data in real time, and update the deviation value of the preferred value of the drum water level and the set value of the drum water level through the regulator in real time.
3. The gas boiler control system of claim 2, wherein the drum water level optimization control module process further comprises directly commanding the opening of the feed water flow valve after the drum water level optimization value and the drum water level set value deviation value are integrated with the main steam flow.
4. The control system of the gas boiler as claimed in claim 1, wherein the process of the main steam temperature optimization control module is to calculate a main steam temperature preferred value through a PID algorithm according to the load of the current boiler, the main steam temperature preferred value is subjected to DIFF processing and then subjected to fuzzy reasoning together with a main steam temperature set value through the main steam temperature main regulator, dynamic parameters of the main regulator are updated in real time, the dynamic parameters of the main regulator are combined with real-time data of the oxygen content of the flue gas at the outlet of the superheater and the flow rate of the main steam after being integrated as the output of the main regulator and the temperature after the temperature reduction valve, an optimization control instruction is given out after the main steam temperature auxiliary regulator and the real-time data of the oxygen content of the flue gas at the outlet of the furnace and the temperature after the temperature reduction valve are comprehensively calculated, and the opening degree of the temperature reduction valve is controlled through the calculated optimization control instruction.
5. The control system of the gas boiler according to claim 1, wherein the process of the hearth pressure control module is to calculate a hearth negative pressure preferred value by a PID algorithm according to the current boiler load, calculate a deviation value between the hearth negative pressure preferred value and a hearth negative pressure set value by a regulator, calculate a hearth negative pressure control command by a PID algorithm after synthesizing the total air volume and the total fuel volume as feed forward and the deviation value between the hearth negative pressure preferred value and the hearth negative pressure set value, control the opening of the hearth air supply and gas valve, and control the hearth air supply volume and the gas volume.
6. The control system of a gas boiler according to claim 1, wherein the process of the air supply oxygen control module is to calculate a demand reference of an air supply amount by using real-time data of a coal gas amount after FILT processing and raw data, calculate a main steam flow, offset-synthesize the main steam flow with a HMI oxygen set value, calculate an oxygen optimization value by PID algorithm, calibrate and correct the main steam flow by an oxygen controller, integrate with the demand reference of the air supply amount, offset-synthesize the calculated demand of the air supply amount with a set value of the air supply amount, compare the air supply amount demand with a real-time measured value of the air supply amount, calculate an optimization control command by an air volume controller, control a blower, input the air supply amount demand as feedforward to the air volume controller, and adjust the air supply amount.
7. The control system of the gas boiler as set forth in claim 1, wherein the boiler-boiler coordination control module is divided into a boiler control and a steam turbine control; the boiler control process comprises the steps of calculating a deviation value by a PID algorithm according to a main steam pressure preferred value and a main steam pressure set value, inputting the deviation value and an original deviation value into a first regulator after fuzzy reasoning to calculate a corresponding data signal, comprehensively calculating the oxygen content of the boiler and the content of CO in flue gas, then comprehensively calculating the boiler and the steam pocket pressure after intelligent correction, comprehensively calculating the calculated data and the data calculated in the first regulator, calculating the deviation value with the gas amount preferred value, and inputting the deviation value into a second regulator to calculate the gas optimization control command of each layer at the moment.
8. The control system of a gas boiler according to claim 7, wherein the control of the gas engine is performed by changing the opening of the variable height gate to maintain the pre-engine pressure at a desired target value in the main steam pressure control mode, and the set value of the pre-engine pressure is set by an operator; under the pressure control mode, the steam turbine master control changes the opening degree of a main steam high-pressure speed regulation steam valve of the steam turbine according to the deviation between a main steam pressure set value subjected to rate limitation and the main steam pressure of the steam turbine so as to maintain the main steam pressure of the steam turbine equal to the set value; under a coordination control mode, the steam turbine main control changes the opening degree of a main steam high-pressure speed regulation steam valve of the steam turbine according to a power instruction subjected to rate limitation and a set target load instruction subjected to rate limitation by superposing a CCS (central control system) side primary frequency modulation instruction and the set target load instruction so as to maintain the power of the set to be stable in a target load range.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117759922A (en) * | 2024-01-27 | 2024-03-26 | 海宁马桥大都市热电有限公司 | Boiler drum water level optimization algorithm control system |
| CN117781270A (en) * | 2023-11-24 | 2024-03-29 | 浙江嘉化能源化工股份有限公司 | Automatic control system for optimizing circulating fluidized bed boiler |
| CN118980087A (en) * | 2024-08-05 | 2024-11-19 | 科大智能物联技术股份有限公司 | A control method for gas boilers in power plants based on machine learning model prediction |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117781270A (en) * | 2023-11-24 | 2024-03-29 | 浙江嘉化能源化工股份有限公司 | Automatic control system for optimizing circulating fluidized bed boiler |
| CN117759922A (en) * | 2024-01-27 | 2024-03-26 | 海宁马桥大都市热电有限公司 | Boiler drum water level optimization algorithm control system |
| CN118980087A (en) * | 2024-08-05 | 2024-11-19 | 科大智能物联技术股份有限公司 | A control method for gas boilers in power plants based on machine learning model prediction |
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