Surfacing process for desuperheating water regulating valve of power plant boiler

Abstract

The invention discloses a surfacing welding process for a desuperheating water regulating valve of a power plant boiler, which comprises the following steps of: acquiring maintenance parameters of the desuperheating water regulating valve, analyzing the maintenance parameters, and determining the fault type of the current desuperheating water regulating valve; performing performance analysis on the plurality of surfacing materials according to the fault type and working condition requirements of the attemperation water regulating valve, and determining a preferred surfacing material according to a performance analysis result; based on a plurality of preset surfacing technological processes of the preferred surfacing material, surfacing evaluation indexes corresponding to the preset surfacing technological processes are set, correlation analysis is conducted on the welding parameters and the surfacing evaluation indexes, and related welding parameters of the surfacing evaluation indexes are determined; and relevant welding parameters of the surfacing evaluation indexes in different historical periods are obtained, the application degree of the relevant welding parameters is calculated, and the optimal welding parameter of each preset surfacing technological process is screened out according to the application degree, so that the quality of the welding position and the use effect of the attemperation water regulating valve are ensured, and safe and stable operation of a unit is ensured.

Description

Technical Field

[0001] The present application relates to the technical field of cladding technology for desuperheating water regulating valves, and in particular to a cladding technology for desuperheating water regulating valves of power plant boilers. Background Art

[0002] The desuperheating water regulating valve is a multi-stage throttling regulating valve for preventing cavitation. The valve can be used in large and medium-sized generator sets to control the flow of desuperheating water required for the temperature of the boiler main steam and reheated steam. The desuperheating water regulating valve is a key device for controlling the flow and velocity of the medium in the industrial process, and its failure has a direct impact on industrial production.

[0003] In the prior art, the cladding process of the cooling water regulating valve requires high operator experience. When the cladding materials and welding parameters are not properly selected, the production cost of the workpiece will be high and the product quality will be low, which cannot meet the process requirements and thus cannot ensure the safe and stable operation of the unit. Summary of the invention

[0004] In order to solve the above technical problems, the present application provides a surfacing welding process for a cooling water regulating valve of a power plant boiler. The preferred surfacing welding material is determined according to the fault type and working condition requirements of the cooling water regulating valve. According to multiple preset surfacing welding process flows of the preferred surfacing welding material, a surfacing welding evaluation index is set, and relevant welding parameters of each surfacing welding evaluation index are screened out, and the application degree of the relevant welding parameters is evaluated. According to the evaluation results, the optimal welding parameters of each preset surfacing welding process flow are determined, and the preferred surfacing welding material and the optimal welding parameters are simulated to obtain a virtual cooling water regulating valve. The performance quality of the virtual cooling water regulating valve is checked, and it is judged whether the process requirements are met based on the inspection results to ensure the quality of the weld and the use effect of the cooling water regulating valve, thereby ensuring the safe and stable operation of the unit.

[0005] In some embodiments of the present application, a surfacing welding process for a desuperheating water regulating valve of a power plant boiler is provided, comprising:

[0006] Obtain the maintenance parameters of the desuperheating water regulating valve, analyze the maintenance parameters, and determine the current fault type of the desuperheating water regulating valve;

[0007] According to the fault type and working condition requirements of the desuperheating water regulating valve, the performance of multiple cladding materials is analyzed, and the preferred cladding material is determined based on the performance analysis results;

[0008] Based on a plurality of preset surfacing welding process flows of the preferred surfacing welding materials, surfacing welding evaluation indicators corresponding to the preset surfacing welding process flows are set, correlation analysis is performed between welding parameters and surfacing welding evaluation indicators, and relevant welding parameters of the surfacing welding evaluation indicators are determined;

[0009] Obtain relevant welding parameters of different historical periods of cladding evaluation indicators, calculate the application degree of relevant welding parameters, and select the optimal welding parameters for each preset cladding process flow according to the application degree;

[0010] The preferred surfacing materials and the corresponding optimal welding parameters are simulated, and the corresponding predicted surfacing evaluation values ​​are generated according to the simulation results. It is determined whether to generate correction instructions for the optimal welding parameters according to the predicted surfacing evaluation values.

[0011] In some embodiments of the present application, determining the fault type of the current desuperheating water regulating valve includes:

[0012] Acquire multiple historical fault types of the desuperheating water regulating valve and historical maintenance parameters corresponding to each historical fault type;

[0013] Compare historical maintenance parameters of different historical fault types, and select historical maintenance parameters whose difference is greater than a preset difference threshold according to the comparison result, and set them as the first concerned maintenance parameters of the corresponding historical fault type;

[0014] Compare historical maintenance parameters of different historical time nodes of the same historical fault type, and select historical maintenance parameters whose overlap degree is greater than a preset overlap degree threshold according to the comparison result, and set them as the second focus maintenance parameters of the corresponding historical fault type;

[0015] Determine a third maintenance parameter of a corresponding historical fault type according to the first maintenance parameter of concern and the second maintenance parameter of concern of the same historical fault type, and construct a fault type-maintenance parameter mapping table according to the mapping relationship between the historical fault type and the corresponding third maintenance parameter of concern;

[0016] Based on the fault type-maintenance parameter mapping table, the fault type of the maintenance parameter of the current cooling water regulating valve is determined.

[0017] In some embodiments of the present application, according to the fault type and working condition requirements of the desuperheating water regulating valve, a plurality of surfacing materials are subjected to performance analysis, and a preferred surfacing material is determined according to the performance analysis results, including:

[0018] According to the fault type of the desuperheating water regulating valve and the corresponding historical surfacing welding log, multiple pending surfacing welding materials are obtained;

[0019] The working condition requirements include high temperature strength requirements, impact strength requirements and welding suitability requirements;

[0020] According to the current standard high temperature strength requirement, standard impact strength requirement and standard welding adaptability requirement of the desuperheated water regulating valve, quantification processing is performed to obtain the first standard quantization value, the second standard quantization value and the third standard quantization value respectively;

[0021] Obtaining the actual high temperature strength, actual impact strength and predicted welding suitability corresponding to the selected pending surfacing material, and quantifying the actual high temperature strength, actual impact strength and predicted welding suitability to obtain a first actual quantized value, a second actual quantized value and a third actual quantized value respectively;

[0022] According to the relationship between the first standard quantization value, the second standard quantization value, the third standard quantization value and the first actual quantization value, the second actual quantization value, the third actual quantization value, the welding performance energy value of the corresponding undetermined surfacing material is generated.

[0023] In some embodiments of the present application, the calculation formula of the welding performance energy value is:

[0024] Hi=(a1i-p1)*e1+(a2i-p2)*e2+(a3i-p3)*e3;

[0025] Wherein, Hi is the welding performance energy value of the i-th undetermined surfacing material, a1i is the first actual quantized value of the i-th undetermined surfacing material, p1 is the first standard quantized value, a2i is the second actual quantized value of the i-th undetermined surfacing material, p2 is the second standard quantized value, a3i is the third actual quantized value of the i-th undetermined surfacing material, p3 is the third standard quantized value, e1 is the weight coefficient corresponding to the high temperature strength requirement, e2 is the weight coefficient corresponding to the impact strength requirement, e3 is the weight coefficient corresponding to the welding suitability requirement, and e1+e2+e3=1;

[0026] The welding performance energy values ​​of a plurality of pending surfacing materials are sorted, and the first-ranked pending surfacing material in the sorting result is set as the preferred surfacing material for the current cooling water regulating valve.

[0027] In some embodiments of the present application, correlation analysis is performed on welding parameters and cladding evaluation indicators to determine relevant welding parameters of the cladding evaluation indicators, including:

[0028] A plurality of evaluation reference intervals of the cladding evaluation index of each preset cladding process are preset, and each evaluation reference interval is mapped with a corresponding welding parameter;

[0029] The welding parameters mapped to different evaluation reference intervals of the same welding evaluation index are compared, and the parameter difference of the welding parameters mapped to different evaluation reference intervals is calculated according to the comparison result;

[0030] A difference ratio is generated according to the reference interval difference of different evaluation reference intervals and the corresponding parameter difference, and a welding parameter whose difference ratio is greater than the corresponding preset difference ratio threshold is set as a relevant welding parameter of the corresponding surfacing evaluation index.

[0031] In some embodiments of the present application, the application degree of relevant welding parameters is calculated, and the optimal welding parameters of each preset cladding process flow are screened out according to the application degree, including:

[0032] Obtain relevant welding parameters of the same welding evaluation index in different historical periods, and generate the application degree of the corresponding relevant welding parameters according to the historical repair log of the relevant welding parameters;

[0033] The historical repair log includes the historical application time, historical repair cost, historical repair time and historical impact coefficient of the corresponding relevant welding parameters;

[0034] The calculation formula of the application degree is:

[0035] M=e t1-t2 ×k1+(r-r0)×k2-lny×k3;

[0036] Where M is the application degree, t1 is the historical application duration, t2 is the historical repair duration, k1 is the duration application degree conversion coefficient, r is the historical repair cost, r0 is the preset repair cost threshold, k2 is the cost application degree conversion coefficient, y is the historical impact coefficient, and k3 is the impact application degree conversion coefficient;

[0037] According to the application degree of relevant welding parameters in different historical periods of the same preset surfacing welding evaluation index in the same preset surfacing welding process, they are sorted by size, and the relevant welding parameter ranked first in each surfacing welding evaluation index in the same preset surfacing welding process is set as the optimal welding parameter in the corresponding preset surfacing welding process.

[0038] In some embodiments of the present application, before simulating the preferred surfacing material and the corresponding optimal welding parameters, the following steps are included:

[0039] Determine the actual position information and actual structural information of the desuperheating water regulating valve, and lock the position of the preset panoramic map, collect the actual fault information from the determined fault type, and obtain a static simulation scenario of the locked position based on the actual fault information;

[0040] According to the welding machine requirements and the actual fault information, the dynamic information to be set is obtained, the correlation relationship of each surfacing welding process in the dynamic information to be set is obtained, and the dynamic relationship of each surfacing welding process under the same dynamic node is established;

[0041] The dynamic relationship is linked to the static simulation scene in position, and a simulation model of the surfacing process for the cooling water regulating valve is constructed.

[0042] In some embodiments of the present application, generating a corresponding predicted surfacing evaluation value according to the simulation result includes:

[0043] The simulation model is controlled according to the preferred surfacing materials, the optimal surfacing parameters of each preset surfacing process flow, and the surfacing sequence of multiple preset surfacing process flows to obtain a virtual desuperheating water regulating valve;

[0044] Performing flaw detection and performance inspection simulation on the virtual desuperheating water regulating valve, generating a first evaluation value according to the flaw detection simulation result, and generating a second evaluation value according to the performance detection simulation result;

[0045] A predicted surfacing evaluation value of the currently preferred surfacing material and the optimal surfacing parameters of the preset surfacing process flow is generated according to the first evaluation value and the second evaluation value.

[0046] In some embodiments of the present application, judging whether to generate a correction instruction for the optimal welding parameter according to the predicted surfacing evaluation value includes:

[0047] Pre-set the threshold of the cladding evaluation value;

[0048] When the predicted surfacing evaluation value is less than the surfacing evaluation value threshold, the surfacing evaluation index that does not meet the performance requirements is determined, and the optimal welding parameters that need to be corrected are screened out according to the correlation between the optimal welding parameters and the surfacing evaluation index, and the corresponding correction instructions are generated;

[0049] When the predicted surfacing evaluation value is greater than the surfacing evaluation value threshold, no correction instruction is generated for the optimal welding parameters, and the cooling water regulating valve is repaired by surfacing welding according to the preferred surfacing material and the optimal welding parameters.

[0050] Compared with the prior art, the surfacing welding process of a power plant boiler desuperheating water regulating valve in the embodiment of the present application has the following beneficial effects:

[0051] The preferred surfacing material is determined according to the fault type and working condition requirements of the desuperheating water regulating valve. The surfacing evaluation index is set according to multiple preset surfacing process flows of the preferred surfacing material, and the relevant welding parameters of each surfacing evaluation index are screened out. The application degree of the relevant welding parameters is evaluated, and the optimal welding parameters of each preset surfacing process flow are determined according to the evaluation results. The preferred surfacing material and the optimal welding parameters are simulated to obtain a virtual desuperheating water regulating valve, and a performance quality inspection is carried out on the virtual desuperheating water regulating valve. According to the inspection results, it is judged whether the process requirements are met to ensure the quality of the welding point and the use effect of the desuperheating water regulating valve, thereby ensuring the safe and stable operation of the unit. BRIEF DESCRIPTION OF THE DRAWINGS

[0052] Figure 1 It is a flow chart of a surfacing process for a power plant boiler desuperheating water regulating valve in a preferred embodiment of the present application. DETAILED DESCRIPTION

[0053] The specific implementation methods of the present application are further described in detail below in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present application but are not intended to limit the scope of the present application.

[0054] In the description of the present application, it should be understood that the terms "center", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0055] The terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, unless otherwise specified, "plurality" means two or more.

[0056] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0057] like Figure 1 As shown, a surfacing process for a power plant boiler desuperheating water regulating valve according to a preferred embodiment of the present application includes:

[0058] Step S101: obtaining maintenance parameters of the desuperheating water regulating valve, analyzing the maintenance parameters, and determining the current fault type of the desuperheating water regulating valve;

[0059] Step S102: performing performance analysis on a plurality of surfacing materials according to the fault type and working condition requirements of the desuperheating water regulating valve, and determining a preferred surfacing material according to the performance analysis results;

[0060] Step S103: based on a plurality of preset surfacing welding process flows of the preferred surfacing welding material, setting a surfacing welding evaluation index corresponding to the preset surfacing welding process flow, performing correlation analysis between the welding parameters and the surfacing welding evaluation index, and determining relevant welding parameters of the surfacing welding evaluation index;

[0061] Step S104: obtaining relevant welding parameters of different historical periods of the cladding evaluation index, calculating the application degree of the relevant welding parameters, and selecting the optimal welding parameters for each preset cladding process flow according to the application degree;

[0062] Step S105: simulating the preferred surfacing material and the corresponding optimal welding parameters, generating a corresponding predicted surfacing evaluation value according to the simulation results, and determining whether to generate a correction instruction for the optimal welding parameters according to the predicted surfacing evaluation value.

[0063] In this embodiment, according to the working condition requirements of the regulating valve, it is necessary to ensure sufficient high temperature strength and meet certain erosion and impact resistance. Referring to the selection principle of surfacing materials and the analysis of the mechanical properties of each surfacing material, the preferred surfacing material is selected. For example, Stellite cobalt-based No. 6 welding wire (Co106) is selected for repair treatment. The original sealing ring material S31600 has high alloy element content, large carbon equivalent, poor welding performance, and after nitriding treatment, the surface hardness of the valve seat sealing ring is high, and welding cracks are easily generated during welding. Comprehensively considering the performance of the base material and welding materials, selecting ERNiCrMo-3 as the transition layer welding material for welding has the following advantages: first, the nickel-based material has good weldability and strong cold crack resistance, and can be welded without preheating or low-temperature preheating, reducing the probability of cracks in the Stellite alloy and reducing the process difficulty; the nickel-based material has excellent plasticity and toughness, good deformation ability, and can buffer the impact on the alloy layer during the operation of the unit.

[0064] In this embodiment, the preset surfacing process includes accurate pre-welding, pre-welding preheating, welding process, welding completion, and local heat treatment after welding. For example, pre-welding preparation: first use a rotary file to thoroughly clean and remove the nitriding layer within 20mm of the surfacing part, the grinding depth should be greater than 0.4mm, and the hardness value of the grinding part is measured to ensure that the welding area meets the requirements of HB185-321. All defects on the sealing surface are cleaned and processed into a groove, and the edge is 50-60° with the horizontal position. Considering that the heat input should be minimized as much as possible under the premise of ensuring smooth welding for the workpiece repair welding, the shape of the groove is slightly widened according to the elimination of defects, and the sharp corners are smoothly transitioned to ensure normal welding; preheating before welding: oxygen and acetylene flame heating methods are used for preheating before welding, and the preheating temperature of surfacing ERNiCrMo-3 is controlled within 150-200℃. During the welding process, the preheating temperature of surfacing Stellite alloy is relatively high, and the interlayer temperature is controlled within 450℃. Welding current I = 80 ~ 90A, argon flow 8 ~ 10L / min, DC positive connection, voltage range 10 ~ 15V, welding speed 30 ~ 45mm / min, each swing width <10mm, each layer of surfacing thickness <3mm. After the preheating temperature is reached, welding begins, and the interlayer temperature is controlled at 300 ~ 400 ℃. No defects are allowed during the welding process. Focus on checking the arc initiation and arc closing. If defects are found, remove them immediately with an angle grinder. Welding completion: After welding is completed, it is slowly cooled with aluminum silicate refractory wool. The welding part is cooled to 100 ~ 150 ℃, and local heat treatment is immediately performed after welding. Local heat treatment after welding: The heat treatment is heated to 640 ~ 660 ℃ by flame, kept warm for 30 minutes, and monitored by a temperature gun. The heating rate and cooling rate are both <300 ℃. It can be uncontrolled when cooling to below 300 ℃. When cooling, it is slowly cooled with aluminum silicate fiber blanket.

[0065] In this embodiment, the surfacing evaluation index is set according to the purpose and effect of each preset surfacing process flow, and the surfacing evaluation index includes the straightness of the surfacing surface, the thickness and width of the surfacing layer, the contact angle of the surfacing edge, the corrosion resistance of the surfacing layer, etc. The relevant welding parameters refer to the welding parameters whose correlation degree with the surfacing evaluation index is greater than the preset correlation degree threshold.

[0066] In this embodiment, each preset surfacing welding process is closely related to the corresponding surfacing welding evaluation index. The effect of the corresponding preset surfacing welding process can be reflected according to multiple surfacing welding evaluation indicators. Therefore, the relevant welding parameters of each surfacing welding evaluation index are screened out, and the relevant welding parameters are analyzed to obtain the optimal welding parameters of each preset surfacing welding process. According to the preferred surfacing welding materials and the optimal welding parameters, the quality of the welding point and the use effect of the cooling water regulating valve are ensured, thereby ensuring the safe and stable operation of the unit.

[0067] In some embodiments of the present application, determining the fault type of the current desuperheating water regulating valve includes:

[0068] Acquire multiple historical fault types of the desuperheating water regulating valve and historical maintenance parameters corresponding to each historical fault type;

[0069] Compare historical maintenance parameters of different historical fault types, and select historical maintenance parameters whose difference is greater than a preset difference threshold according to the comparison result, and set them as the first concerned maintenance parameters of the corresponding historical fault type;

[0070] Compare historical maintenance parameters of different historical time nodes of the same historical fault type, and select historical maintenance parameters whose overlap degree is greater than a preset overlap degree threshold according to the comparison result, and set them as the second focus maintenance parameters of the corresponding historical fault type;

[0071] Determine a third maintenance parameter of a corresponding historical fault type according to the first maintenance parameter of concern and the second maintenance parameter of concern of the same historical fault type, and construct a fault type-maintenance parameter mapping table according to the mapping relationship between the historical fault type and the corresponding third maintenance parameter of concern;

[0072] Based on the fault type-maintenance parameter mapping table, the fault type of the maintenance parameter of the current cooling water regulating valve is determined.

[0073] In this embodiment, the degree of difference refers to that the same historical maintenance parameter does not appear in two or more historical fault types at the same time or the parameter interval difference of the historical maintenance parameter that appears in two or more historical fault types at the same time is greater than the preset parameter interval difference threshold. The preset parameter interval difference threshold is set in advance to achieve the difference between the historical maintenance parameters in each historical fault type. The degree of overlap is the number of different historical time nodes at which a historical maintenance parameter appears simultaneously in the same historical fault type, which represents the importance of the corresponding historical maintenance parameter in the historical fault type.

[0074] In this embodiment, the third maintenance parameter of concern is a maintenance parameter that appears in both the first maintenance parameter of concern and the second maintenance parameter of concern. The similarity between the current maintenance parameter and the third maintenance parameter of concern in the fault type-maintenance parameter mapping table is calculated, and the one with the greatest similarity is set as the fault type of the current maintenance parameter.

[0075] In this embodiment, a fault type-maintenance parameter mapping table is constructed, and the corresponding fault type is determined based on the similarity between the current maintenance parameter and the third focus maintenance parameter in the fault type-maintenance parameter mapping table, thereby laying the foundation for the subsequent selection of the corresponding preferred surfacing material and optimal welding parameters, thereby improving the accuracy and efficiency of the surfacing repair of the cooling water regulating valve.

[0076] In some embodiments of the present application, according to the fault type and working condition requirements of the desuperheating water regulating valve, a plurality of surfacing materials are subjected to performance analysis, and a preferred surfacing material is determined according to the performance analysis results, including:

[0077] According to the fault type of the desuperheating water regulating valve and the corresponding historical surfacing welding log, multiple pending surfacing welding materials are obtained;

[0078] The working condition requirements include high temperature strength requirements, impact strength requirements and welding suitability requirements;

[0079] According to the current standard high temperature strength requirement, standard impact strength requirement and standard welding adaptability requirement of the desuperheated water regulating valve, quantification processing is performed to obtain the first standard quantization value, the second standard quantization value and the third standard quantization value respectively;

[0080] Obtaining the actual high temperature strength, actual impact strength and predicted welding suitability corresponding to the selected pending surfacing material, and quantifying the actual high temperature strength, actual impact strength and predicted welding suitability to obtain a first actual quantized value, a second actual quantized value and a third actual quantized value respectively;

[0081] According to the relationship between the first standard quantization value, the second standard quantization value, the third standard quantization value and the first actual quantization value, the second actual quantization value, the third actual quantization value, the welding performance energy value of the corresponding undetermined surfacing material is generated.

[0082] In this embodiment, the pending surfacing material is obtained based on the surfacing materials involved in the historical surfacing log corresponding to the current fault type, and the welding suitability requirement refers to the minimum matching degree between the material of the surfacing part of the cooling water regulating valve and each pending surfacing material.

[0083] In this embodiment, according to the high temperature strength requirements, impact strength requirements and welding suitability requirements in the working conditions, the welding performance energy value of each pending surfacing material is calculated, and the pending surfacing material with the largest welding performance energy value is set as the preferred surfacing material to ensure the quality of the weld and the use effect of the cooling water regulating valve, thereby ensuring the safe and stable operation of the unit.

[0084] In some embodiments of the present application, the calculation formula of the welding performance energy value is:

[0085] Hi=(a1i-p1)*e1+(a2i-p2)*e2+(a3i-p3)*e3;

[0086] Wherein, Hi is the welding performance energy value of the i-th undetermined surfacing material, a1i is the first actual quantized value of the i-th undetermined surfacing material, p1 is the first standard quantized value, a2i is the second actual quantized value of the i-th undetermined surfacing material, p2 is the second standard quantized value, a3i is the third actual quantized value of the i-th undetermined surfacing material, p3 is the third standard quantized value, e1 is the weight coefficient corresponding to the high temperature strength requirement, e2 is the weight coefficient corresponding to the impact strength requirement, e3 is the weight coefficient corresponding to the welding suitability requirement, and e1+e2+e3=1;

[0087] The welding performance energy values ​​of a plurality of pending surfacing materials are sorted, and the first-ranked pending surfacing material in the sorting result is set as the preferred surfacing material for the current cooling water regulating valve.

[0088] 5. The surfacing welding process for the desuperheating water regulating valve of a power plant boiler according to claim 4, characterized in that the welding parameters are analyzed for correlation with the surfacing welding evaluation index to determine the relevant welding parameters of the surfacing welding evaluation index, including:

[0089] A plurality of evaluation reference intervals of the cladding evaluation index of each preset cladding process are preset, and each evaluation reference interval is mapped with a corresponding welding parameter;

[0090] The welding parameters mapped to different evaluation reference intervals of the same welding evaluation index are compared, and the parameter difference of the welding parameters mapped to different evaluation reference intervals is calculated according to the comparison result;

[0091] A difference ratio is generated according to the reference interval difference of different evaluation reference intervals and the corresponding parameter difference, and a welding parameter whose difference ratio is greater than the corresponding preset difference ratio threshold is set as a relevant welding parameter of the corresponding surfacing evaluation index.

[0092] In this embodiment, the difference ratio = parameter difference / reference interval difference, and the preset difference ratio threshold is set according to the reference interval difference of different evaluation reference intervals and the minimum parameter difference of the welding parameters with strong correlation. The preset difference threshold can represent the minimum difference ratio with strong correlation between the surfacing evaluation index and the welding parameters.

[0093] In this embodiment, the welding parameters mapped according to different evaluation reference intervals of the same surfacing evaluation index are compared, and the relevant welding parameters of each surfacing evaluation index are screened out according to the difference ratio, so as to reduce the data processing amount, speed up the determination of the optimal welding parameters, and improve the repair efficiency of the cooling water regulating valve while ensuring the quality of the welding point and the use effect of the cooling water regulating valve, thereby ensuring the safe and stable operation of the unit.

[0094] In some embodiments of the present application, the application degree of relevant welding parameters is calculated, and the optimal welding parameters of each preset cladding process flow are screened out according to the application degree, including:

[0095] Obtain relevant welding parameters of the same welding evaluation index in different historical periods, and generate the application degree of the corresponding relevant welding parameters according to the historical repair log of the relevant welding parameters;

[0096] The historical repair log includes the historical application time, historical repair cost, historical repair time and historical impact coefficient of the corresponding relevant welding parameters;

[0097] The calculation formula of the application degree is:

[0098] M=e t1-t2 ×k1+(r-r0)×k2-lny×k3;

[0099] Where M is the application degree, t1 is the historical application duration, t2 is the historical repair duration, k1 is the duration application degree conversion coefficient, r is the historical repair cost, r0 is the preset repair cost threshold, k2 is the cost application degree conversion coefficient, y is the historical impact coefficient, and k3 is the impact application degree conversion coefficient;

[0100] According to the application degree of relevant welding parameters in different historical periods of the same preset surfacing welding evaluation index in the same preset surfacing welding process, they are sorted by size, and the relevant welding parameter ranked first in each surfacing welding evaluation index in the same preset surfacing welding process is set as the optimal welding parameter in the corresponding preset surfacing welding process.

[0101] In this embodiment, different historical time periods refer to the time periods in which the cooling water regulating valve is repaired according to different relevant welding parameter ranges in the same welding evaluation index. The historical impact coefficient refers to the degree of impact on the unit when a cooling water regulating valve fails. When the degree of occurrence is large, the historical impact coefficient is larger, and the value range of the historical impact coefficient is (0, 1).

[0102] In this embodiment, by comparing the application degrees of multiple different relevant welding parameter ranges of the surfacing evaluation indicators in the same preset surfacing process flow, the relevant welding parameters corresponding to the maximum application degree are obtained, and the relevant welding parameters with the maximum application degree in each surfacing evaluation indicator in the same preset surfacing process flow are set as the optimal welding parameters in the corresponding preset surfacing process flow to ensure the quality of the welding point and the use effect of the cooling water regulating valve, thereby ensuring the safe and stable operation of the unit.

[0103] In some embodiments of the present application, before simulating the preferred surfacing material and the corresponding optimal welding parameters, the following steps are included:

[0104] Determine the actual position information and actual structural information of the desuperheating water regulating valve, and lock the position of the preset panoramic map, collect the actual fault information from the determined fault type, and obtain a static simulation scenario of the locked position based on the actual fault information;

[0105] According to the welding machine requirements and the actual fault information, the dynamic information to be set is obtained, the correlation relationship of each surfacing welding process in the dynamic information to be set is obtained, and the dynamic relationship of each surfacing welding process under the same dynamic node is established;

[0106] The dynamic relationship is linked to the static simulation scene in position, and a simulation model of the surfacing process for the cooling water regulating valve is constructed.

[0107] In this embodiment, the static simulation scene refers to the scene, weather, etc. involved in the cooling water regulating valve, and the dynamic information refers to the optimal welding parameters of each preset surfacing process flow.

[0108] In this embodiment, a simulation model of the welding process of the current cooling water regulating valve is built through dynamic relationships and static simulation scenarios to obtain a subsequent virtual cooling water regulating valve, and perform performance quality testing, which is conducive to discovering and improving the deficiencies of the optimal welding parameters, thereby improving the quality of the welds and the use effect of the cooling water regulating valve, thereby ensuring safe and stable operation of the unit.

[0109] In some embodiments of the present application, generating a corresponding predicted surfacing evaluation value according to the simulation result includes:

[0110] The simulation model is controlled according to the preferred surfacing materials, the optimal surfacing parameters of each preset surfacing process flow, and the surfacing sequence of multiple preset surfacing process flows to obtain a virtual desuperheating water regulating valve;

[0111] Perform flaw detection and performance inspection simulation on the virtual desuperheating water regulating valve, generate a first evaluation value according to the flaw detection simulation result, and generate a second evaluation value according to the performance detection simulation result;

[0112] A predicted surfacing evaluation value of the currently preferred surfacing material and the optimal surfacing parameters of the preset surfacing process flow is generated according to the first evaluation value and the second evaluation value.

[0113] In this embodiment, the predicted surfacing evaluation value = the first evaluation value * the first weight coefficient + the second evaluation value * the second weight coefficient, the first evaluation value is set according to the flaw detection simulation result, when the flaw detection simulation result includes defective quality, large defective quality and non-defective quality, the defective quality includes whether the weld has cracks, slag inclusions, pores, etc., when there is no defective quality, the first evaluation value is the largest, otherwise, the first evaluation value is the smallest when the defective quality is large, the second evaluation value is set according to the performance inspection simulation result, the performance inspection simulation includes a multi-faceted inspection of the performance of the workpiece, and setting the minimum performance requirements for each performance, comparing the performance requirements in the performance inspection simulation results with the corresponding minimum performance requirements, when multiple performance requirements are greater than the corresponding minimum performance requirements, the larger the second evaluation value, otherwise the smaller the second evaluation value.

[0114] In this embodiment, the preferred surfacing materials and the optimal welding parameters of each preset surfacing process flow are simulated to obtain a repaired virtual cooling water regulating valve, and the virtual cooling water regulating valve is inspected to obtain a predicted surfacing evaluation value based on the inspection results, so as to determine whether the corresponding preferred surfacing materials and the optimal welding parameters need to be corrected, so as to ensure the quality of the welding point and the use effect of the cooling water regulating valve, thereby ensuring the safe and stable operation of the unit.

[0115] In some embodiments of the present application, judging whether to generate a correction instruction for the optimal welding parameter according to the predicted surfacing evaluation value includes:

[0116] Pre-set the threshold of the cladding evaluation value;

[0117] When the predicted surfacing evaluation value is less than the surfacing evaluation value threshold, the surfacing evaluation index that does not meet the performance requirements is determined, and the optimal welding parameters that need to be corrected are screened out according to the correlation between the optimal welding parameters and the surfacing evaluation index, and the corresponding correction instructions are generated;

[0118] When the predicted surfacing evaluation value is greater than the surfacing evaluation value threshold, no correction instruction is generated for the optimal welding parameters, and the cooling water regulating valve is repaired by surfacing welding according to the preferred surfacing material and the optimal welding parameters.

[0119] The above is only a preferred implementation of the present application. It should be pointed out that for ordinary technicians in this technical field, several improvements and substitutions can be made without departing from the technical principles of the present application. These improvements and substitutions should also be regarded as the scope of protection of the present application.

Claims

1. A surfacing welding process for a power plant boiler desuperheating water regulating valve, characterized in that: include: Obtain the maintenance parameters of the desuperheating water regulating valve, analyze the maintenance parameters, and determine the current fault type of the desuperheating water regulating valve; According to the fault type and working condition requirements of the desuperheating water regulating valve, the performance of multiple cladding materials is analyzed, and the preferred cladding material is determined based on the performance analysis results; Based on a plurality of preset surfacing welding process flows of the preferred surfacing welding materials, surfacing welding evaluation indicators corresponding to the preset surfacing welding process flows are set, correlation analysis is performed between welding parameters and surfacing welding evaluation indicators, and relevant welding parameters of the surfacing welding evaluation indicators are determined; Obtain relevant welding parameters of different historical periods of cladding evaluation indicators, calculate the application degree of relevant welding parameters, and select the optimal welding parameters for each preset cladding process flow according to the application degree; The preferred surfacing materials and the corresponding optimal welding parameters are simulated, and the corresponding predicted surfacing evaluation values ​​are generated according to the simulation results. It is determined whether to generate correction instructions for the optimal welding parameters according to the predicted surfacing evaluation values.

2. The surfacing welding process for the desuperheating water regulating valve of a power plant boiler according to claim 1, characterized in that: Determine the fault type of the current desuperheating water regulating valve, including: Acquire multiple historical fault types of the desuperheating water regulating valve and historical maintenance parameters corresponding to each historical fault type; Compare historical maintenance parameters of different historical fault types, and select historical maintenance parameters whose difference is greater than a preset difference threshold according to the comparison result, and set them as the first concerned maintenance parameters of the corresponding historical fault type; Compare historical maintenance parameters of different historical time nodes of the same historical fault type, and select historical maintenance parameters whose overlap degree is greater than a preset overlap degree threshold according to the comparison result, and set them as the second focus maintenance parameters of the corresponding historical fault type; Determine a third maintenance parameter of a corresponding historical fault type according to the first maintenance parameter of concern and the second maintenance parameter of concern of the same historical fault type, and construct a fault type-maintenance parameter mapping table according to the mapping relationship between the historical fault type and the corresponding third maintenance parameter of concern; Based on the fault type-maintenance parameter mapping table, the fault type of the maintenance parameter of the current cooling water regulating valve is determined.

3. The surfacing welding process for the desuperheating water regulating valve of a power plant boiler as claimed in claim 2, characterized in that: According to the fault type and working condition requirements of the desuperheating water regulating valve, the performance of multiple cladding materials is analyzed, and the preferred cladding materials are determined based on the performance analysis results, including: According to the fault type of the desuperheating water regulating valve and the corresponding historical surfacing welding log, multiple pending surfacing welding materials are obtained; The working condition requirements include high temperature strength requirements, impact strength requirements and welding suitability requirements; According to the current standard high temperature strength requirement, standard impact strength requirement and standard welding adaptability requirement of the desuperheated water regulating valve, quantification processing is performed to obtain the first standard quantization value, the second standard quantization value and the third standard quantization value respectively; Obtaining the actual high temperature strength, actual impact strength and predicted welding suitability corresponding to the selected pending surfacing material, and quantifying the actual high temperature strength, actual impact strength and predicted welding suitability to obtain a first actual quantized value, a second actual quantized value and a third actual quantized value respectively; According to the relationship between the first standard quantization value, the second standard quantization value, the third standard quantization value and the first actual quantization value, the second actual quantization value, the third actual quantization value, the welding performance energy value of the corresponding undetermined surfacing material is generated.

4. The surfacing welding process for the desuperheating water regulating valve of a power plant boiler as claimed in claim 3 is characterized in that: The calculation formula of the welding performance energy value is: Hi=(a1i-p1)*e1+(a2i-p2)*e2+(a3i-p3)*e3; Wherein, Hi is the welding performance energy value of the i-th undetermined surfacing material, a1i is the first actual quantized value of the i-th undetermined surfacing material, p1 is the first standard quantized value, a2i is the second actual quantized value of the i-th undetermined surfacing material, p2 is the second standard quantized value, a3i is the third actual quantized value of the i-th undetermined surfacing material, p3 is the third standard quantized value, e1 is the weight coefficient corresponding to the high temperature strength requirement, e2 is the weight coefficient corresponding to the impact strength requirement, e3 is the weight coefficient corresponding to the welding suitability requirement, and e1+e2+e3=1; The welding performance energy values ​​of a plurality of pending surfacing materials are sorted, and the first-ranked pending surfacing material in the sorting result is set as the preferred surfacing material for the current cooling water regulating valve.

5. The surfacing welding process for the desuperheating water regulating valve of a power plant boiler as claimed in claim 4, characterized in that: The correlation analysis between welding parameters and cladding evaluation indexes is carried out to determine the relevant welding parameters of cladding evaluation indexes, including: A plurality of evaluation reference intervals of the cladding evaluation index of each preset cladding process are preset, and each evaluation reference interval is mapped with a corresponding welding parameter; The welding parameters mapped to different evaluation reference intervals of the same welding evaluation index are compared, and the parameter difference of the welding parameters mapped to different evaluation reference intervals is calculated according to the comparison result; A difference ratio is generated according to the reference interval difference of different evaluation reference intervals and the corresponding parameter difference, and a welding parameter whose difference ratio is greater than the corresponding preset difference ratio threshold is set as a relevant welding parameter of the corresponding surfacing evaluation index.

6. The surfacing welding process for the desuperheating water regulating valve of a power plant boiler as claimed in claim 5, characterized in that: Calculate the application degree of relevant welding parameters and select the optimal welding parameters for each preset cladding process according to the application degree, including: Obtain relevant welding parameters of the same welding evaluation index in different historical periods, and generate the application degree of the corresponding relevant welding parameters according to the historical repair log of the relevant welding parameters; The historical repair log includes the historical application time, historical repair cost, historical repair time and historical impact coefficient of the corresponding relevant welding parameters; The calculation formula of the application degree is: M= t1-t2 ×k1+(r-r0)×k2-lny×k3; Where M is the application degree, t1 is the historical application duration, t2 is the historical repair duration, k1 is the duration application degree conversion coefficient, r is the historical repair cost, r0 is the preset repair cost threshold, k2 is the cost application degree conversion coefficient, y is the historical impact coefficient, and k3 is the impact application degree conversion coefficient; According to the application degree of relevant welding parameters in different historical periods of the same preset surfacing welding evaluation index in the same preset surfacing welding process, they are sorted by size, and the relevant welding parameter ranked first in each surfacing welding evaluation index in the same preset surfacing welding process is set as the optimal welding parameter in the corresponding preset surfacing welding process.

7. The surfacing welding process for the desuperheating water regulating valve of a power plant boiler as claimed in claim 5, characterized in that: Before simulating the optimal cladding material and the corresponding optimal welding parameters, the following are included: Determine the actual position information and actual structural information of the desuperheating water regulating valve, and lock the position of the preset panoramic map, collect the actual fault information from the determined fault type, and obtain a static simulation scenario of the locked position based on the actual fault information; According to the welding machine requirements and the actual fault information, the dynamic information to be set is obtained, the correlation relationship of each surfacing welding process in the dynamic information to be set is obtained, and the dynamic relationship of each surfacing welding process under the same dynamic node is established; The dynamic relationship is linked to the static simulation scene in position, and a simulation model of the surfacing process for the cooling water regulating valve is constructed.

8. The surfacing welding process for the desuperheating water regulating valve of a power plant boiler as claimed in claim 7, characterized in that: Generate corresponding predicted cladding evaluation values ​​based on simulation results, including: The simulation model is controlled according to the preferred surfacing materials, the optimal surfacing parameters of each preset surfacing process flow, and the surfacing sequence of multiple preset surfacing process flows to obtain a virtual desuperheating water regulating valve; Perform flaw detection and performance inspection simulation on the virtual desuperheating water regulating valve, generate a first evaluation value according to the flaw detection simulation result, and generate a second evaluation value according to the performance detection simulation result; A predicted surfacing evaluation value of the currently preferred surfacing material and the optimal surfacing parameters of the preset surfacing process flow is generated according to the first evaluation value and the second evaluation value.

9. The surfacing welding process for the desuperheating water regulating valve of a power plant boiler as claimed in claim 8, characterized in that: Determine whether to generate correction instructions for optimal welding parameters according to the predicted cladding evaluation value, including: Pre-set the threshold of the cladding evaluation value; When the predicted surfacing evaluation value is less than the surfacing evaluation value threshold, the surfacing evaluation index that does not meet the performance requirements is determined, and the optimal welding parameters that need to be corrected are screened out according to the correlation between the optimal welding parameters and the surfacing evaluation index, and the corresponding correction instructions are generated; When the predicted surfacing evaluation value is greater than the surfacing evaluation value threshold, no correction instruction is generated for the optimal welding parameters, and the cooling water regulating valve is repaired by surfacing welding according to the preferred surfacing material and the optimal welding parameters.

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