CN-122021454-A - Method and system for monitoring and regulating thermal expansion dynamic response of water-cooled wall

CN122021454ACN 122021454 ACN122021454 ACN 122021454ACN-122021454-A

Abstract

The embodiment of the invention relates to the technical field of monitoring and controlling of water-cooling walls of boilers, and provides a method and a system for monitoring and controlling the thermal expansion dynamic response of a water-cooling wall, wherein a three-dimensional model of the water-cooling wall is constructed by acquiring structural data of the water-cooling wall and performing topology analysis; the method comprises the steps of extracting a key heated area, carrying out working medium flow path analysis and strain acquisition of a fiber bragg grating sensor to obtain working medium dynamic circulation data and thermal expansion strain change data, inverting dynamic thermal stress based on the thermal expansion strain change data, carrying out fatigue damage accumulation analysis by combining an unsteady state working condition, optimizing the working medium flow path to generate working medium optimizing flow path data, carrying out variable load control adjustment on the working medium optimizing flow path data by combining load change data of boiler depth peak regulation operation data to generate a dynamic regulation path for minimizing thermal stress fluctuation, adjusting boiler operation parameters according to the dynamic regulation path, feeding back to a control system of a boiler, and realizing closed loop monitoring and fatigue risk early warning of thermal expansion dynamic response of a boiler water wall.

Inventors

LI WEI
XU ZIYUAN
WANG TING
CAI YANZHOU
SUN QI
LOU ZHENGJI
Zhu Binsha
TIAN XIAOXUAN
LI JUTAO
Sun Xiongbo
ZHANG XINGYU
ZHANG JIAKUAN
CHEN SHENGGUANG
CAO XIAOLONG
ZHU CHANGCI
ZHANG RUIGANG
QIN NAN
HUANG JIANHUA
SHEN ZINAN

Assignees

西安热工研究院有限公司
华能(广东)能源开发有限公司汕头电厂

Dates

Publication Date: 20260512
Application Date: 20260227

Claims (10)

1. The method for monitoring and regulating the thermal expansion dynamic response of the water-cooled wall is characterized by comprising the following steps of: acquiring boiler water wall structure data, carrying out topological structure analysis on a water wall system based on the boiler water wall structure data to generate water wall pipe network topology data, and carrying out virtual simulation modeling on the boiler water wall structure data by utilizing the water wall pipe network topology data to generate a water wall three-dimensional model; Extracting a key heated area of the water-cooled wall three-dimensional model, analyzing a working medium flow path of the key heated area, generating working medium dynamic circulation data, and acquiring data of a fiber bragg grating sensor based on the key heated area to obtain thermal expansion strain change data; Calculating dynamic thermal stress data of the thermal expansion strain change data, performing unsteady state fatigue damage analysis on the dynamic thermal stress data through the working medium dynamic circulation data to generate water-cooling wall fatigue damage accumulation data, and performing flow optimization on the working medium flow path by utilizing the water-cooling wall fatigue damage accumulation data to generate working medium optimized flow path data; The method comprises the steps of obtaining boiler depth peak regulation operation data, extracting load change data of the boiler depth peak regulation operation data, carrying out variable load control optimization on working medium optimization flow path data according to the load change data, obtaining a dynamic regulation path for minimizing thermal stress fluctuation, adjusting boiler operation parameters based on the dynamic regulation path for minimizing thermal stress fluctuation, and feeding back a boiler operation parameter adjustment result to a control system of a boiler so as to realize thermal expansion dynamic response closed loop monitoring and fatigue risk early warning operation of a boiler water wall.
2. The method of monitoring and controlling thermal expansion dynamic response of a water wall according to claim 1, wherein performing topology analysis on a water wall system based on the boiler water wall structure data to generate water wall pipe network topology data, performing virtual simulation modeling on the boiler water wall structure data by using the water wall pipe network topology data, and generating a water wall three-dimensional model comprises: The method comprises the steps of carrying out structure component identification based on the boiler water wall structure data, extracting water wall tube panel unit data, constructing an equipment connection relation graph based on the water wall tube panel unit data, generating a water wall initial structure graph, carrying out graph structure analysis on the water wall initial structure graph, extracting node connection relation, and generating the water wall tube network topology data; Performing space association modeling on the water wall pipe screen unit data by utilizing the water wall pipe network topology data to generate structural mapping data, performing virtual simulation modeling operation on the basis of the structural mapping data to generate a water wall initial three-dimensional structure model, and performing pipe screen geometric correction and welding node processing on the water wall initial three-dimensional structure model to generate the water wall three-dimensional model.
3. The method for monitoring and controlling thermal expansion dynamic response of a water-cooled wall according to claim 1, wherein extracting a critical heated area of the three-dimensional model of the water-cooled wall, analyzing a working medium flow path of the critical heated area, generating working medium dynamic circulation data, and collecting fiber bragg grating sensor data based on the critical heated area to obtain thermal expansion strain change data, comprises: The method comprises the steps of carrying out region segmentation on a three-dimensional model of the water wall to obtain key heated region structure data, identifying a water wall pipeline based on the key heated region structure data to obtain water wall pipeline topology data, carrying out path tracking analysis on the water wall pipeline topology data, calculating the length and distribution of a working medium flow path, and generating working medium dynamic circulation data; Performing fiber bragg grating sensor layout simulation based on the key heated region structure data to generate sensing sampling layout data, performing strain acquisition control on the sensing sampling layout data to obtain thermal expansion strain original response data, and performing temperature compensation and strain separation on the thermal expansion strain original response data to generate thermal expansion strain change data.
4. The method for monitoring and controlling thermal expansion dynamic response of water wall according to claim 3, wherein performing path tracing analysis on the water wall pipeline topology data, calculating the length and distribution of the working medium flow path, and generating the working medium dynamic circulation data comprises: Node connectivity screening is carried out on the water wall pipeline topology data, effective flow path segments are extracted, and path structure network data are generated; performing geometric reconstruction and curvature analysis on the path structure network data, extracting path segment geometric constraint information, and generating flow path geometric feature data; Performing space path expansion on the geometric feature data of the flow path, and performing flow vector calculation on the expanded space path to generate an initial flow path vector field; the method comprises the steps of measuring a flow resistance coefficient of a structure in a water-cooled wall, carrying out path through resistance weighting on an initial flow path vector field through the flow resistance coefficient of the structure in the water-cooled wall to generate an equivalent flow resistance path diagram, carrying out working medium flow path length integration and flow velocity dynamic simulation on the equivalent flow resistance path diagram, calculating path-level working medium transmission delay, and generating flow delay matrix data; And estimating path-level heat exchange efficiency of the flow time delay matrix data to generate the working medium dynamic flow data.
5. The method of claim 4, wherein performing spatial path expansion on the flow path geometric feature data and performing flow vector calculation on the expanded spatial path to generate an initial flow path vector field, and comprising: Performing three-dimensional structure denoising projection on the geometric feature data of the flow path, eliminating high-order micro-curvature interference, and generating a path main shaft fitting line group; Performing geometric continuity weight distribution on the space expansion path set, calibrating the direction consistency and the structure influence coefficient of each path segment, and generating a path direction weighting matrix; carrying out directional flow vector decomposition based on the path direction weighting matrix, extracting a main flow vector and a disturbance vector of a path micro-element unit, and generating a local flow distribution map; And carrying out full-path scale splicing reconstruction on the local flow direction distribution map to generate the initial flow path vector field.
6. The method of monitoring and controlling thermal expansion dynamic response of a water-cooled wall according to claim 1, wherein calculating dynamic thermal stress data of the thermal expansion strain change data, performing unsteady state fatigue damage analysis on the dynamic thermal stress data by the working medium dynamic circulation data, generating water-cooled wall fatigue damage accumulation data, performing flow optimization on the working medium flow path by using the water-cooled wall fatigue damage accumulation data, generating working medium optimized flow path data, comprising: performing multi-scale thermodynamic inversion on the thermal expansion strain change data to generate dynamic temperature field distribution data, performing material thermal response modeling on the dynamic temperature field distribution data, and calculating the corresponding dynamic thermal stress data; Performing coupling analysis on the dynamic thermal stress data and the working medium flow dynamic boundary condition data, performing unsteady fatigue damage modeling, and generating fatigue damage evolution curve data; Performing region clustering on the fatigue damage evolution curve data, and extracting a damage accumulation threshold value of a clustered region to generate the water-cooled wall fatigue damage accumulation data; and carrying out path loss sensitivity analysis on the working medium flow path based on the water-cooled wall fatigue damage accumulated data, identifying a high-risk path segment, generating a flow path improvement candidate set, and carrying out flow efficiency reconstruction and heat exchange performance evaluation on the flow path improvement candidate set, so as to generate the working medium optimized flow path data.
7. The method of monitoring and controlling thermal expansion dynamic response of a water wall according to claim 6, wherein performing flow efficiency reconstruction and heat exchange performance evaluation on the flow path improvement candidate set to generate the working medium optimized flow path data comprises: Identifying a turbulence structure of the flow path improvement candidate set according to the path flow velocity distribution data and performing pressure drop calculation to generate a flow resistance distribution map; Carrying out inter-path thermal performance comparison analysis on the heat exchange efficiency distribution data, screening out high-performance path units and generating a path performance preferred set; Carrying out structural safety rechecking on the path performance preferred set and the water-cooled wall fatigue damage accumulated data, removing potential fatigue segments, and generating a structural safety optimized path set; And carrying out multi-objective heat-flow-solid collaborative optimization calculation on the structural safety optimization path set, comprehensively evaluating heat efficiency, structural integrity and flow stability, and finally generating the working medium optimization flow path data.
8. The method for monitoring and controlling thermal expansion dynamic response of water-cooled wall according to claim 1, wherein extracting load variation data of the boiler depth peak regulation operation data, performing variable load control optimization on the working medium optimizing flow path data according to the load variation data to obtain a dynamic control path minimizing thermal stress fluctuation, adjusting boiler operation parameters based on the dynamic control path minimizing thermal stress fluctuation, and feeding back the boiler operation parameter adjustment result to a control system of a boiler to realize thermal expansion dynamic response closed loop monitoring and fatigue risk early warning operation of the boiler water-cooled wall, comprising: extracting the load change rate and transient load fluctuation of the boiler depth peak regulation operation data to obtain load change sequence data; Performing time sequence coupling simulation on the variable load stress characteristic data and the working medium optimizing flow path data, analyzing stress response distribution of different working medium flow paths, and generating a variable load path stress distribution diagram; calculating a damage cumulative function of each candidate path based on the variable load path stress distribution diagram, screening out a candidate path with the minimum damage growth rate, and generating the dynamic regulation path for minimizing the thermal stress fluctuation; And inputting the boiler operation parameter adjustment scheme into the water-cooled wall three-dimensional model for closed-loop monitoring of the thermal expansion dynamic response, judging the fatigue risk threshold of the monitored thermal expansion dynamic response, and executing fatigue risk early warning operation of the boiler water-cooled wall according to the judging result of the fatigue risk threshold.
9. The method for monitoring and controlling thermal expansion dynamic response of water-cooled wall according to claim 8, wherein the optimizing the variable load control of the boiler water-cooled wall by using the dynamic control path for minimizing thermal stress fluctuation, generating a boiler operation parameter adjustment scheme, comprises: Carrying out rapid load change paragraph identification on the boiler water wall by utilizing the dynamic regulation path for minimizing thermal stress fluctuation to obtain rapid load change paragraph data; Carrying out variable load rate optimization on the dynamic regulation path for minimizing thermal stress fluctuation according to the rapid variable load paragraph data to generate variable load rate optimization data; setting a dynamic temperature control threshold value based on the variable load rate optimization data, and performing first variable load control optimization on the dynamic regulation path for minimizing thermal stress fluctuation through the dynamic temperature control threshold value to generate first variable load control optimization data; The low-load stable combustion path is obtained by screening the low-load stable combustion path on the boiler water wall based on the dynamic regulation path for minimizing the thermal stress fluctuation; and integrating the first variable load control optimization data and the second variable load control optimization data into the boiler operation parameter adjustment scheme.
10. A water wall thermal expansion dynamic response monitoring and control system, comprising: at least one processor, and A memory communicatively coupled to the at least one processor, wherein, The memory stores a computer program executable by the at least one processor to enable the at least one processor to perform the water wall thermal expansion dynamic response monitoring and regulating method of any one of claims 1 to 9.

Description

Method and system for monitoring and regulating thermal expansion dynamic response of water-cooled wall Technical Field The invention relates to the technical field of monitoring and regulating of boiler water-cooling walls, in particular to a method and a system for monitoring and regulating thermal expansion dynamic response of a water-cooling wall. Background Along with the continuous improvement of the power generation duty ratio of the new energy, the electric power system has higher requirements on the peak shaving capacity of the traditional coal-fired unit, and the deep peak shaving becomes an important working condition for the normalized operation of the coal-fired unit. In the deep peak regulation process, the boiler frequently undergoes large-amplitude load change, start-up and stop and low-load operation, so that the water-cooled wall system can bear severe thermal shock and periodical temperature gradient change, and further obvious thermal expansion unevenness and dynamic stress fluctuation are caused. The complex thermodynamic alternating environment is extremely easy to induce fatigue damage, deformation and even leakage of the water wall tube panel, and seriously threatens the safety and reliability of the operation of the boiler. At present, monitoring of the thermal expansion of the water-cooled wall is mostly dependent on local measuring points or static design analysis, and the real-time sensing and evaluating capability of dynamic response characteristics under the full-system thermal-flow-solid coupling effect is lacking. Particularly, under the variable working condition, the interaction relation between the working medium flow distribution, the wall temperature field evolution and the structural thermal stress is highly nonlinear and unsteady, and the traditional monitoring means are difficult to accurately capture the thermal expansion strain evolution process and the fatigue accumulation trend of the key area. In addition, the existing regulation strategies are mostly based on experience setting, and lack of systematic method support from structural topology modeling, sensing data fusion and damage mechanism analysis to operation parameter closed-loop optimization, so that effective suppression and risk early warning of thermal stress fluctuation cannot be realized. Disclosure of Invention The invention provides a method and a system for monitoring and regulating thermal expansion dynamic response of a water-cooled wall, and aims to solve the technical problems that the prior art lacks the capability of accurately evaluating the real-time sensing and fatigue damage of the thermal expansion dynamic response of the water-cooled wall of a boiler under the deep peak regulation working condition, and the closed-loop optimization regulation and control of thermal stress fluctuation inhibition and operation parameters are difficult to realize. In one aspect of the invention, a method for monitoring and regulating the thermal expansion dynamic response of a water wall is provided, which comprises the following steps: acquiring boiler water wall structure data, carrying out topological structure analysis on a water wall system based on the boiler water wall structure data to generate water wall pipe network topology data, and carrying out virtual simulation modeling on the boiler water wall structure data by utilizing the water wall pipe network topology data to generate a water wall three-dimensional model; Extracting a key heated area of the water-cooled wall three-dimensional model, analyzing a working medium flow path of the key heated area, generating working medium dynamic circulation data, and acquiring data of a fiber bragg grating sensor based on the key heated area to obtain thermal expansion strain change data; Calculating dynamic thermal stress data of the thermal expansion strain change data, performing unsteady state fatigue damage analysis on the dynamic thermal stress data through the working medium dynamic circulation data to generate water-cooling wall fatigue damage accumulation data, and performing flow optimization on the working medium flow path by utilizing the water-cooling wall fatigue damage accumulation data to generate working medium optimized flow path data; The method comprises the steps of obtaining boiler depth peak regulation operation data, extracting load change data of the boiler depth peak regulation operation data, carrying out variable load control optimization on working medium optimization flow path data according to the load change data, obtaining a dynamic regulation path for minimizing thermal stress fluctuation, adjusting boiler operation parameters based on the dynamic regulation path for minimizing thermal stress fluctuation, and feeding back a boiler operation parameter adjustment result to a control system of a boiler so as to realize thermal expansion dynamic response closed loop monitoring and fatigue risk early warning operation of a boi