CN-121806686-B - Multi-target coordination control method and system for biomass gas pulsation pressure coupling system

CN121806686BCN 121806686 BCN121806686 BCN 121806686BCN-121806686-B

Abstract

The invention discloses a multi-target coordinated control method and a system of a biomass gas pulsation pressure coupling system, which relate to the technical field of pressure control and comprise the steps of establishing a pressure rhythm base line, synchronously mapping biomass gas pulsation pressure and negative pressure of a second subsystem to a unified time sequence, identifying a section of the pulsation rhythm close to the inherent rhythm of a suction executing mechanism and forming a negative pressure resonance trigger band; on the basis, time dislocation regulation and control are carried out on the biomass gas pulsation rhythm, a new pressure rhythm base line is constructed, gradual buffer release is carried out on the negative pressure of the second subsystem, and finally, the two rhythm relations are continuously coordinated, so that the biomass gas pulsation rhythm keeps a stable peak-staggering operation state in a unified time sequence. The invention realizes the active peak staggering regulation and control of the biomass gas pulsation rhythm and the negative pressure rhythm of the second subsystem by constructing the pressure rhythm base line and the negative pressure resonance trigger band, weakens resonance amplification, inhibits ash reverse spraying and stabilizes a flow field, establishes a rhythm coordination mechanism, ensures stable air pressure change and improves operation stability and thermal efficiency.

Inventors

LIU ZHOU
FAN QINSHAN
FU YIWEI
Cheng Manqiu
ZHENG SHIJIN
DING HONG
ZHOU FEI
ZHANG PENG
Ye Xingpei
LIU MINGRUI
LI CUNLEI
Jie Xiaochen

Assignees

江苏省国信研究院有限公司

Dates

Publication Date: 20260512
Application Date: 20260306

Claims (10)

1. The multi-target coordination control method of the biomass gas pulsation pressure coupling system is characterized by comprising the following steps of: Step one, establishing a continuous pressure change time chain, synchronously mapping a pulse pressure waveform of a first subsystem and a negative pressure waveform in a second subsystem into a unified time sequence, extracting corresponding points of a biomass gas pulse peak rhythm and a controlled negative pressure fluctuation rhythm, and forming a pressure rhythm baseline; Step two, based on the constructed pressure rhythm base line, recognizing a change section of the pulsation rhythm of the first subsystem, which gradually approaches to the inherent rhythm of the suction executing mechanism, extracting starting nodes of the negative pressure fluctuation amplitude amplification of the second subsystem, and associating the starting nodes according to a time sequence to form a negative pressure resonance trigger zone; Step three, based on the established negative pressure resonance trigger band, performing time dislocation regulation and control on the pulsation rhythm of the first subsystem, and introducing a controlled micro-time difference interval into the original pulsation rhythm sequence to obtain a pressure rhythm base line after time dislocation regulation and control; Step four, combining the pressure rhythm base line regulated and controlled by time dislocation to implement buffer release control on the negative pressure change process of the second subsystem; And fifthly, continuously adjusting the coordination rhythm between the first subsystem pulsation rhythm and the controlled negative pressure fluctuation rhythm based on the pressure rhythm base line formed after the buffer release control.
2. The method of multi-objective coordinated control of a biomass gas pulse pressure coupling system according to claim 1, wherein the process of forming a pressure rhythm baseline comprises the steps of: Around the pressure transmission channel between the first subsystem and the second subsystem, pressure measuring devices are respectively arranged in the air outlet pipeline of the first subsystem and the negative pressure area in the second subsystem, and the pressure change of the air outlet pipeline of the first subsystem and the negative pressure area in the second subsystem is continuously collected; Performing time sequence mapping on the acquired first subsystem pulse pressure waveform and the acquired second subsystem negative pressure waveform to enable the biomass gas pulse pressure rising section and the acquired second subsystem negative pressure response section to keep corresponding on the same time axis; Identifying peak points of the first subsystem pulse pressure waveform and the lowest points of the second subsystem negative pressure waveform along a unified time sequence, and using the peak-valley points with the smallest time difference as corresponding relation nodes, and connecting the peak points and the valley points in series according to the time sequence to form a continuous time chain; And connecting the corresponding relation nodes serving as base points to form a rhythm change curve, so as to obtain a pressure rhythm baseline.
3. The method of multi-objective coordinated control of a biomass gas pulsating pressure coupling system according to claim 1, wherein the process of forming a negative pressure resonance trigger zone comprises the steps of: Continuously scanning the pulsation rhythm change process of the first subsystem and the negative pressure fluctuation change process of the second subsystem along the established pressure rhythm base line, recording the pulsation period of the biomass gas and the negative pressure response period of the second subsystem point by point, and judging whether the pulsation rhythm of the first subsystem gradually approaches to the inherent rhythm of the suction executing mechanism; extracting the variation trend of the negative pressure fluctuation amplitude of the second subsystem along the pressure rhythm baseline, marking the time point of negative pressure fluctuation amplification point by point, and determining the starting node of the negative pressure fluctuation amplification, wherein the starting node corresponds to the junction point of the first subsystem pulsation rhythm and the controlled negative pressure fluctuation rhythm; And correlating the starting nodes amplified by the negative pressure fluctuation according to the time sequence order, so that the time interval between the adjacent nodes is kept consistent with the pressure rhythm baseline, and a negative pressure resonance trigger zone which continuously extends along the time axis is formed.
4. The method for multi-objective coordinated control of a biomass gas pulsation pressure coupling system according to claim 3, wherein the time extension processing is performed on the negative pressure resonance trigger zone, and the method comprises the steps of going back from a starting node of the first negative pressure fluctuation amplification, bringing a time zone of the first subsystem pulsation rhythm close to the intrinsic rhythm of the suction actuator into a front section range of the negative pressure resonance trigger zone, and simultaneously extending back from a starting node of the last negative pressure fluctuation amplification, bringing a time zone of the second subsystem negative pressure fluctuation amplitude stabilization into a rear section range of the negative pressure resonance trigger zone.
5. The multi-objective coordinated control method of a biomass gas pulsation pressure coupling system according to claim 3, wherein the process of acquiring the pressure rhythm baseline after time-staggered regulation comprises the following steps: In the time range of the negative pressure resonance trigger zone, correspondingly matching the pulsation rhythm of the first subsystem with the negative pressure fluctuation node of the second subsystem, extracting the time points of the pulsation peak value of the biomass gas and the negative pressure fluctuation starting node point by point along a time sequence, establishing a time corresponding table, and determining a synchronous area by taking a pressure rhythm base line as a reference; Performing time dislocation regulation and control on the identified synchronous region, and performing controlled delay or advance operation on the pulsation peak value of the first subsystem by taking the time axis of the pressure rhythm base line as a reference, so that the pulsation peak value deviates from the corresponding position of the negative pressure fluctuation node of the second subsystem on the time sequence, thereby forming a new time distribution pattern; And on the basis of completing the time dislocation regulation operation, re-drawing the time mapping relation between the biomass gas pulsation peak value and the negative pressure fluctuation curve of the second subsystem along the time sequence to generate a pressure rhythm baseline regulated by time dislocation.
6. The method for multi-objective coordinated control of a biomass gas pulsation pressure coupling system according to claim 5, wherein the process of performing the buffer release control on the second subsystem negative pressure variation process comprises the steps of: Continuously identifying negative pressure fluctuation characteristics in the second subsystem by combining the pressure rhythm base line regulated and controlled by time dislocation, extracting the instantaneous change value of the negative pressure of the second subsystem point by point along the time axis of the pressure rhythm base line regulated and controlled by time dislocation, judging the time interval and fluctuation amplitude change between adjacent peaks, determining a negative pressure concentrated fluctuation section, and marking a starting node of negative pressure fluctuation amplification; Performing buffer release control on the identified negative pressure concentrated fluctuation section along a time sequence, taking a pressure rhythm baseline regulated and controlled by time dislocation as a control reference, adjusting the resistance and flow velocity distribution of a gas flow channel of a second subsystem, and simultaneously controlling the gas reflux speed to release in a sectional manner; On the basis of finishing the buffer release control operation, reconstructing a scattered fluctuation form of the negative pressure change of the second subsystem along the pressure rhythm base line regulated and controlled by time dislocation, and rearranging the time interval between the peak and the trough of the negative pressure change of the second subsystem.
7. The method according to claim 6, wherein in the buffer release control process, the adjustment of the resistance and the flow velocity distribution of the gas flow channel in the second subsystem is performed by a sectional control method, the duration of the negative pressure falling phase is kept consistent with the time interval of the pressure rhythm baseline after the time-staggered regulation, and the gas reflux velocity is distributed in a plurality of local release areas in the negative pressure rising phase.
8. The multi-target coordinated control method of a biomass gas pulse pressure coupling system according to claim 6, wherein the process of continuously adjusting the coordinated rhythm between the first subsystem pulse rhythm and the controlled negative pressure fluctuation rhythm comprises the steps of: along a pressure rhythm baseline after buffer release control, recording the time corresponding relation between the first subsystem pulsation rhythm and the controlled negative pressure fluctuation rhythm point by point, identifying the coordination and offset state of the first subsystem pulsation rhythm and the controlled negative pressure fluctuation rhythm in a unified time sequence, and determining the section and offset direction of rhythm deviation according to time interval change; Dynamically adjusting the rhythm interval of the identified deviation section along the pressure rhythm baseline, comparing the corresponding negative pressure fluctuation trough time nodes of the second subsystem by taking the biomass gas fluctuation peak time point as a control reference, and reforming the peak staggering relation through delay or advance operation; Combining the pressure rhythm base line after buffer release control, implementing continuous synchronization on the coordination rhythm of the first subsystem pulsation rhythm and the controlled negative pressure fluctuation rhythm; And continuously adjusting the whole running state along the pressure rhythm base line after the buffer release control, and adjusting the duration of the biomass gas pulsation period or the negative pressure release period of the second subsystem by continuously comparing the rhythm coordination relations in a plurality of running periods.
9. The multi-target coordinated control method of a biomass gas pulsation pressure coupling system according to claim 8, wherein in the process of continuously adjusting the coordinated rhythm between the first subsystem pulsation rhythm and the controlled negative pressure fluctuation rhythm, a pressure rhythm baseline after buffer release control is taken as a unified time reference, a biomass gas pulsation peak time point and a second subsystem negative pressure fluctuation trough time point are periodically compared, and when a time interval deviation is detected, a biomass gas pulsation peak value is always located in a fixed time interval corresponding to the second subsystem negative pressure fluctuation trough by adjusting the time position of the first subsystem pulsation rhythm.
10. The multi-target coordination control system of the biomass gas pulsation pressure coupling system is used for realizing the multi-target coordination control method of the biomass gas pulsation pressure coupling system according to any one of claims 1-9, and is characterized by comprising a pressure rhythm construction module, a resonance triggering identification module, a rhythm dislocation regulation and control module, a negative pressure buffer release module and a rhythm coordination stabilization module; the pressure rhythm construction module establishes a continuous pressure change time chain, synchronously maps the pulse pressure waveform of the first subsystem and the negative pressure waveform in the second subsystem into a unified time sequence, extracts corresponding points of a biomass gas pulse peak rhythm and a controlled negative pressure fluctuation rhythm, and forms a pressure rhythm baseline; The resonance triggering identification module is used for identifying a change section of the pulsation rhythm of the first subsystem, which gradually approaches to the inherent rhythm of the suction executing mechanism, based on the constructed pressure rhythm base line, extracting starting nodes of the amplification of the negative pressure fluctuation amplitude of the second subsystem, and associating the starting nodes according to a time sequence to form a negative pressure resonance triggering band; The rhythm dislocation regulating and controlling module executes time dislocation regulation and control on the pulsation rhythm of the first subsystem based on the established negative pressure resonance trigger band, and introduces a controlled micro-time difference interval into the original pulsation rhythm sequence to obtain a pressure rhythm base line after time dislocation regulation and control; the negative pressure buffer release module is used for implementing buffer release control on the negative pressure change process of the second subsystem by combining the pressure rhythm base line regulated and controlled by time dislocation; and the rhythm cooperative stabilization module is used for continuously adjusting the coordination rhythm between the first subsystem pulsation rhythm and the controlled negative pressure fluctuation rhythm based on the pressure rhythm base line formed after the buffer release control.

Description

Multi-target coordination control method and system for biomass gas pulsation pressure coupling system Technical Field The invention relates to the technical field of pressure control, in particular to a multi-target coordination control method and system of a biomass gas pulsation pressure coupling system. Background The biomass gas coupling combustion system is a high-efficiency clean combustion device which uses combustible gas generated by gasification treatment of biomass (such as straw, wood dust, rice husk and the like) and solid fossil fuel as main fuel or alternatively burns. The biomass gasification device is used for converting solid biomass into mixed gas containing carbon monoxide, hydrogen, methane and other components, and introducing the biomass gas into a main combustion area or a secondary gas supply area of a combustion system, so that the biomass gas and a main fuel combustion process form energy complementation and temperature layering cooperation, and the improvement of the fuel utilization rate and the reduction of pollutant emission are realized. The multi-objective performance optimization of the biomass gas coupled combustion system is to establish a dynamic balance and comprehensive optimization model among a plurality of performance indexes such as the thermal efficiency, pollutant emission level, combustion stability and operation economy of the system, and through adjusting multidimensional control variables such as fuel ratio, air supply quantity distribution, combustion temperature field distribution, smoke circulation parameters and the like and combining numerical simulation or intelligent algorithm, the synergistic optimization of the maximization of heat energy utilization efficiency, the minimization of pollutant emission and the operation economy of the system is realized, so that the overall operation performance and the environment adaptability are improved. The prior art has the following defects: When the biomass gas has pulsation fluctuation in the gasification output stage and the pulsation frequency gradually enters the effective action range of the natural frequency of the exhaust system, the negative pressure resonance phenomenon in the controlled negative pressure space is easy to be induced. The negative pressure resonance can cause the air pressure in the combustion space to periodically fluctuate, and the local air flow can reversely move in a short time, so that ash particles are reversely brought back to the combustion area through the slag discharging channel. After the ash is reversely returned, continuous high-speed scouring is formed on the lining structure and the heated component to cause obvious abrasion, and the ash can be gradually accumulated in the combustion area to block the combustion channel and destroy the original airflow organization structure. Along with the extension of the operation time, the negative pressure resonance effect can continuously amplify the fluctuation amplitude of the air pressure, so that the combustion process tends to be unstable, the flue gas flow field is more disordered, the deslagging process is disturbed, incomplete combustion or partial coking can be possibly caused, the operation efficiency of the system is further reduced, and the damage risk of equipment is obviously increased. The above information disclosed in the background section is only for enhancement of understanding of the background of the disclosure and therefore it may include information that does not form the prior art that is already known to those of ordinary skill in the art. Disclosure of Invention The invention aims to provide a multi-target coordination control method and system of a biomass gas pulsation pressure coupling system, so as to solve the problems in the background technology. In order to achieve the purpose, the invention provides the following technical scheme that the multi-target coordination control method of the biomass gas pulsation pressure coupling system comprises the following steps: Firstly, establishing a continuous pressure change time chain around a dynamic association relation between negative pressures of a first subsystem and a second subsystem, synchronously mapping a pulsating pressure waveform of the first subsystem and a negative pressure waveform in the second subsystem into a unified time sequence, extracting corresponding points of a biomass gas pulsation peak rhythm and a controlled negative pressure fluctuation rhythm, and forming a pressure rhythm base line for representing the dynamic traction relation of the two, wherein the first subsystem is a biomass gas output end, the second subsystem is a hearth, the first subsystem and the second subsystem form a pressure coupling system, and a controlled negative pressure space is formed in the hearth; Step two, based on the constructed pressure rhythm base line, recognizing a change section of the pulsation rhythm of the first subsystem, which gradually a