Management method for safe operation and maintenance of thermal power plant buildings

Abstract

The invention relates to a management method for safe operation and maintenance of thermal power plant buildings and structures. The method comprises the following steps: S1, field investigation; s2, determining influence factors of the building structure on safe operation and maintenance; s3, determining a fuzzy evaluation comprehensive matrix; s4, determining a weight vector by adopting an AHP method; s5, checking the consistency; s6, fuzzy comprehensive evaluation indexes; s7, determining an operation and maintenance management grade classification standard; and S8, safe operation and maintenance management of thermal power plant buildings. By establishing a thermal power plant building structure safety operation and maintenance management standard, passive accident handling is changed into active prevention and control, safety operation and maintenance are carried out on the thermal power plant building structure in the whole life cycle, the daily operation and maintenance efficiency and the building structure classification management efficiency are improved, and scientific decision-making of thermal power plant building structure safety operation and maintenance management is achieved.

Description

Technical Field

[0001] The invention relates to the technical field of safe operation and maintenance management of engineering structures, and in particular to a management method for safe operation and maintenance of buildings and structures in thermal power plants. Technical Background

[0002] At present, the management of thermal power plants' buildings and structures is classified as equipment management. The power industry generally lacks a safety management system and methods for the operation and maintenance of thermal power plant buildings and structures, and the safety status of buildings and structures mainly relies on the subjective judgment of managers. Power plant managers usually take safety remedial measures for buildings and structures only after safety problems occur, which affects production and poses unpredictable hidden dangers. In the management process, thermal power plants adopt unified standards for various types of buildings and structures, and do not pay special attention to large-span spaces, complex steel structures and other buildings with greater safety risks. While increasing the workload of operation and maintenance personnel, the inability to obtain the actual operation status of buildings and structures in a timely manner brings inconvenience to timely decision-making and handling of faults, and cannot timely obtain the operation status of equipment and make timely decisions to eliminate the faults of buildings and structures. Summary of the invention

[0003] In response to the problems existing in the prior art, the purpose of the present invention is to provide a management method for the safe operation and maintenance of buildings and structures in thermal power plants, to determine the grading principles and methods for the safe operation and maintenance management of buildings and structures in thermal power plants, to enhance the ability of buildings and structures in thermal power plants to prevent structural safety risks, and to create a safe and resilient factory.

[0004] The present invention is achieved in that:

[0005] A management method for safe operation and maintenance of buildings and structures in a thermal power plant comprises the following steps:

[0006] S1 On-site investigation: Investigate the overall situation of the thermal power plant's buildings and structures, and determine the factors that affect the safe operation and maintenance of the thermal power plant's buildings and structures;

[0007] S2 Determine the factors affecting the safe operation and maintenance of buildings and structures: Experts evaluate the four factors affecting the safe operation and maintenance of thermal power plant buildings and structures, namely, the use environment and conditions, importance, structural type, and construction mode, and divide the safe operation and maintenance categories of thermal power plant buildings and structures into three categories: A, B, and C: V = {v1, v2, v3} = {Class A, Class B, Class C}. Standardize the evaluation results by removing the highest and lowest values ​​and then taking the arithmetic mean to calculate the fuzzy subsets of each influencing factor on the evaluation domain V = {v1, v2, v3}, and determine the fuzzy comprehensive judgment matrix R of each building and structure.

[0008]

[0009] S3 Determine the comprehensive fuzzy evaluation matrix: Experts use the 1-9 scale method to construct judgment matrices for the use environment and conditions, importance, structure type, and construction mode, remove the maximum and minimum values, and take the arithmetic mean to obtain the judgment matrix A;

[0010] S4 uses the AHP method to determine the weight vector: If step S4 passes the test, use matlab software to obtain the normalized eigenvector of the judgment matrix A, which is the weight vector P = (a1, a2, a3, ..., a n ), a i ≥0, if step S4 fails, the judgment matrix needs to be reconstructed;

[0011] S5 consistency test: Use consistency index, random consistency index and consistency ratio for consistency test:

[0012]

[0013] Where CI is the matrix inconsistency index, λ max is the maximum eigenvalue of the judgment matrix, n is the matrix order, and RI is the matrix average random one-time index;

[0014] S6 Fuzzy comprehensive evaluation index: Using the fuzzy operator synthesis factor weight P and the fuzzy comprehensive judgment matrix R of each building and structure, the fuzzy comprehensive evaluation index B of each building and structure of the thermal power plant is obtained, that is:

[0015]

[0016] where b i Indicates the safety operation and maintenance management category v of each building and structure in the thermal power plant i degree of affiliation;

[0017] S7 Determine the classification standard of operation and maintenance management level: Determine the safe operation and maintenance category of thermal power plant buildings and structures according to the principle of maximum membership. For each building and structure, select the fuzzy subset with the largest membership in the domain V = {v1, v2, v3} as its safe operation and maintenance category, that is:

[0018] B={b1,b2,b3}

[0019] When max{b1,b2,b3}=b k , then the safety operation and maintenance management category corresponding to the building is k;

[0020] S8 Safety operation and maintenance management of thermal power plant structures: According to the safety operation and maintenance management category of each structure in the thermal power plant, corresponding management measures are taken for each structure.

[0021] Preferably, in step S2, when calculating the fuzzy subset of each influencing factor on the evaluation domain V = {v1, v2, v3} by taking the arithmetic mean, one decimal place is retained.

[0022] At present, the existing safety management means of thermal power plant buildings and structures mainly rely on daily inspections supplemented by structural inspection and appraisal. This safety management method can no longer meet the thermal power plant's needs for safety management of buildings and structures. It is necessary to establish safety operation and maintenance management standards for thermal power plant buildings and structures, change passive accident handling into active prevention and control, carry out safe operation and maintenance of thermal power plant buildings and structures throughout their life cycle, improve the efficiency of daily operation and maintenance and classification management of buildings and structures, and achieve scientific decision-making in the safety operation and maintenance management of thermal power plant buildings and structures. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Attached Figure 1 It is a step diagram of the present invention. Example

[0024] The present invention is further described below in conjunction with the accompanying drawings and embodiments. The following implementation methods of the present invention do not limit the patent protection scope of the present invention. Any equivalent structure or equivalent transformation made using the contents of the present specification and the accompanying drawings, or directly or indirectly used in the relevant technical field, are also included in the patent protection scope of the present invention.

[0025] S1 On-site survey

[0026] The main structures of a power plant are as follows:

[0027] (1) Combustion and thermal systems: turbine room, deaerator room, coal bunker room, centralized control building, boiler steel frame, blower support, induced draft fan support, flue gas denitrification steel frame, electrostatic precipitator, flue support, desulfurization absorption tower, chimney.

[0028] (2) Material transportation system: wharf, coal handling trestle, transfer station, coal crusher room, closed coal yard (steel structure coal yard, membrane structure coal yard), silo (warehouse), pipeline and pipeline support, slag bucket, coal ash bucket, ash storage, dewatering bin, material storage, ship unloader and bucket wheel excavator.

[0029] (3) Electrical system: substation support (boosting station).

[0030] (4) Chemical system: chemical water treatment workshop, wastewater pool, water tank.

[0031] (5) Circulating water system: cooling tower, circulating water pump room, integrated water pump room, rainwater pump room, and supply water pump room. (6) Office and activity area: office building, fire building.

[0032] S2 Determine the factors affecting safe operation and maintenance of building structures

[0033] The factors affecting the safe operation and maintenance of thermal power plant structures include: operating environment and conditions, importance, structural type, and construction mode.

[0034] S3 determines the fuzzy evaluation comprehensive matrix

[0035] In order to facilitate the actual application of power plants, the safety operation and maintenance categories of buildings and structures in Zhejiang Energy Power Thermal Power Plants are divided into three categories: V = {v1, v2, v3} = {Class A, Class B, Class C}. Five experts were invited to evaluate the four factors affecting the safety operation and maintenance of thermal power plant buildings and structures, namely, the use environment and conditions, importance, structural type, and construction mode. After the evaluation results were standardized, the fuzzy subsets of each influencing factor on the evaluation domain V = {v1, v2, v3} were calculated (keeping one decimal place) by removing the highest and lowest values ​​and then taking the arithmetic mean, and finally the fuzzy comprehensive judgment matrix R of each building and structure was determined.

[0036]

[0037] The fuzzy comprehensive judgment matrix of the main buildings and structures of a power plant is as follows (when the four influencing factors of use environment and conditions, importance, structural type, and construction mode are basically the same, the judgment matrix is ​​also the same):

[0038] (1) Steam engine room, deaerator room, coal bunker room, boiler steel frame, and centralized control building:

[0039]

[0040] (2) Fan bracket, induced draft fan bracket, flue bracket, dock, cooling tower:

[0041]

[0042] (3) Flue gas degassing steel frame and dust collector bracket:

[0043]

[0044] (4) Transfer station, coal crusher room, circulating water pump room:

[0045]

[0046] (5) Desulfurization absorption tower:

[0047]

[0048] (6) Chimneys, silos, slag bins, coal ash hoppers, ash storages, and dehydration bins:

[0049]

[0050] (7) Car tipper room, coal unloading ditch, chemical water treatment workshop, dangerous goods storage room, integrated water pump room, fire pump room:

[0051]

[0052] (8) Coal transport trestle and dry coal shed:

[0053]

[0054] (9) Closed coal yard (air film):

[0055]

[0056] (10) Pipeline support:

[0057]

[0058] (11) Ship unloaders and bucket wheel excavators:

[0059]

[0060] (12) Transformer support:

[0061]

[0062] (13) Wastewater pool:

[0063]

[0064] (14) Water tank:

[0065]

[0066] (15) Rainwater pump house, make-up water pump house, swimming pool:

[0067]

[0068] (16) Office buildings, gymnasiums, and firefighting buildings:

[0069]

[0070] S4 AHP method to determine the weight vector of influencing factors

[0071] After five experts constructed judgment matrices for the use environment and conditions, importance, structure type, and construction mode, the maximum and minimum values ​​were removed and the arithmetic mean was taken to obtain the judgment matrix A, which is recorded as:

[0072]

[0073] The eigenvector of the judgment matrix A is obtained as ω = (0.295 0.075 0.4425 0.1875) T and the maximum eigenvalue λ max =4.04.

[0074] S5 consistency check

[0075] According to the consistency test method, CI = 0.013, CR = 0.015 < 0.1, and the consistency test passed, indicating that the judgment matrix A filled in by the experts has good coordination and the judgment of the influencing factors is reasonable. Therefore, the eigenvector of A ω = (0.2950.075 0.4425 0.1875) T It is the weight vector of the influencing factors.

[0076] S6 fuzzy comprehensive evaluation index

[0077] The fuzzy comprehensive evaluation index B = ω × R can be obtained by the weight vector ω of the factors affecting the safe operation and maintenance of buildings and structures and the fuzzy comprehensive judgment matrix R. The fuzzy comprehensive evaluation indexes of the buildings and structures of the power plant are as follows: (1) Steam engine room, deaerator room, coal bunker room, boiler steel frame, centralized control building:

[0078] B=(0.1672 0.4587 0.374)

[0079] The above results show that the maximum membership of the fuzzy comprehensive evaluation is 0.4587, and the maximum membership corresponds to the safety operation and maintenance management category B. This shows that these buildings and structures should be managed with emphasis, and the frequency of daily inspections and regular inspections should be appropriately strengthened, and corresponding measures should be taken according to the inspection or test results.

[0080] (2) Fan bracket, induced draft fan bracket, flue bracket, dock, cooling tower:

[0081] B=(0.4032 0.3702 0.2265)

[0082] The above results show that the maximum membership of the fuzzy comprehensive evaluation is 0.4032, and the maximum membership corresponds to the safety operation and maintenance management category A. This shows that these buildings and structures should be specially managed, the frequency of daily inspections and regular inspections should be strengthened, and corresponding measures should be taken according to the inspection or test results.

[0083] (3) Flue gas degassing steel frame and dust collector:

[0084] B=(0.501 0.4252 0.0443)

[0085] The above results show that the maximum membership of the fuzzy comprehensive evaluation is 0.501, and the maximum membership corresponds to the safety operation and maintenance management category A.

[0086] (4) Transfer station, coal crusher room, circulating water pump room:

[0087] B=(0.2557 0.4882 0.2265)

[0088] The above results show that the maximum membership of the fuzzy comprehensive evaluation is 0.4882, and the maximum membership corresponds to the safety operation and maintenance management category B.

[0089] (5) Desulfurization absorption tower:

[0090] B=(0.6485 0.3072 0.0443)

[0091] The above results show that the maximum membership of the fuzzy comprehensive evaluation is 0.6485, and the maximum membership corresponds to the safety operation and maintenance management category A.

[0092] (6) Chimneys, silos, slag bins, coal ash hoppers, ash storages, and dehydration bins:

[0093] B=(0.5213 0.3112 0.0937)

[0094] The above results show that the maximum membership of the fuzzy comprehensive evaluation is 0.5213, and the maximum membership corresponds to the safety operation and maintenance management category A.

[0095] (7) Car tipper room, coal unloading ditch, chemical water treatment workshop, dangerous goods storage room, integrated water pump room, fire pump room:

[0096] B=(0.1957 0.5182 0.2565)

[0097] The above results show that the maximum membership of the fuzzy comprehensive evaluation is 0.5182, and the maximum membership corresponds to the safety operation and maintenance management category B.

[0098] (8) Coal transport trestle and dry coal shed:

[0099] B=(0.7573 0.1932 0.0937)

[0100] The above results show that the maximum membership of the fuzzy comprehensive evaluation is 0.7573, and the maximum membership corresponds to the safety operation and maintenance management category A.

[0101] (9) Closed coal yard (air film):

[0102] B=(0.8697 0.1745 0)

[0103] The above results show that the maximum membership of the fuzzy comprehensive evaluation is 0.8697, and the maximum membership corresponds to the safety operation and maintenance management category A.

[0104] (10) Pipeline support:

[0105] B=(0.536 0.326 0.138)

[0106] The above results show that the maximum membership of the fuzzy comprehensive evaluation is 0.536, and the maximum membership corresponds to the safety operation and maintenance management category A.

[0107] (11) Ship unloaders and bucket wheel excavators:

[0108] B=(0.441 0.4552 0.0742)

[0109] The above results show that the maximum membership of the fuzzy comprehensive evaluation is 0.4552, and the maximum membership corresponds to the safety operation and maintenance management category B.

[0110] (12) Transformer support:

[0111] B=(0.3885 0.444 0.138)

[0112] The above results show that the maximum membership of the fuzzy comprehensive evaluation is 0.444, and the maximum membership corresponds to the safety operation and maintenance management category B.

[0113] (13) Wastewater pool:

[0114] B=(0.3432 0.4002 0.2565)

[0115] The above results show that the maximum membership of the fuzzy comprehensive evaluation is 0.4002, and the maximum membership corresponds to the safety operation and maintenance management category B.

[0116] (14) Water tank:

[0117] B=(0.3285 0.474 0.168)

[0118] The above results show that the maximum membership of the fuzzy comprehensive evaluation is 0.474, and the maximum membership corresponds to the safety operation and maintenance management category B.

[0119] (15) Rainwater pump house, make-up water pump house, swimming pool:

[0120] B=(0.1957 0.4732 0.3015)

[0121] The above results show that the maximum membership of the fuzzy comprehensive evaluation is 0.4732, and the maximum membership corresponds to the safety operation and maintenance management category B.

[0122] (16) Office buildings, gymnasiums, and firefighting buildings:

[0123] B=(0.1072 0.3552 0.5965)

[0124] The above results show that the maximum membership of the fuzzy comprehensive evaluation is 0.5965, and the maximum membership corresponds to the safety operation and maintenance management category C. General management should be carried out, and daily inspections, regular inspections and normal maintenance should be maintained. S7 Determine the classification standard for operation and maintenance management level

[0125] According to the above fuzzy comprehensive evaluation results, the classification of safety operation and maintenance recommendations for the power plant structures is shown in the following table:

[0126] Table 1 Suggested classification management table for the power plant structures

[0127]

[0128]

[0129] S8 Thermal Power Plant Building and Structure Safety Operation and Maintenance Management

[0130] For thermal power plant buildings (structures) classified as Class A, Class B and Class C, the periodic inspection cycle should not exceed the period specified in Table 1. Periodic inspections should be carried out on the basic conditions of the buildings (structures), the foundation, the upper load-bearing structure, the use of the enclosure structure and the changes in the appearance of the auxiliary facilities.

[0131] Table 1 Daily inspection and regular inspection cycle of buildings (structures) in thermal power plants

[0132]

[0133] (1) For buildings (structures) of thermal power plants classified as Class A, their regular inspection cycle shall comply with the following provisions:

[0134] 1 For those whose actual working years do not exceed 10 years, the inspection cycle shall be implemented according to Table 1;

[0135] 2 For those whose actual working experience exceeds 10 years, the inspection cycle in Table 1 shall be carried out for half of the time.

[0136] (2) For buildings (structures) of thermal power plants classified as Class A, the frequency of daily inspections and regular checks should be increased before hidden dangers are dealt with; when serious safety hazards exist, measures should be taken immediately.

[0137] (3) The regular inspection of the basic condition of thermal power plant buildings (structures) should include the following contents:

[0138] 1. Actual working years;

[0139] 2. Whether the actual use purpose and use environment have changed, and whether there is any reconstruction, expansion or structural overhaul;

[0140] 3. Whether there is any impact from the surrounding environment or surrounding construction projects;

[0141] 4. Whether the vehicle has suffered any damage from collision, fire, wind disaster, snow disaster, earthquake, flood, explosion or other disasters during the inspection period.

[0142] (4) Regular inspection of foundations should include the following: 1. When there is a large area of ​​ground load around the foundation, check whether it exceeds the allowable range of the load and whether it causes tilting of the upper load-bearing structure, uneven settlement, and damage to node connections;

[0143] 2. Whether there is danger of instability, collapse, etc.;

[0144] 3. Whether there are obvious cracks, subsidence and waterlogging on the surrounding ground;

[0145] 4. Is there any obvious subsidence, and whether it causes abnormal operation of the equipment?

[0146] 5. Whether the groundwater causes the foundation to float or sink significantly;

[0147] 6. Is there any obvious short-term accelerated settlement?

[0148] 7. Are there any nearby underground projects or foundation pit excavations that may affect the foundations of existing buildings?

[0149] (5) Regular inspection of the upper load-bearing structure should include the following items as specified in Table 2:

[0150] Table 2 Periodic inspection contents of upper load-bearing structure

[0151]

[0152] (6) Regular inspection of enclosure structures should include the following:

[0153] 1. Check whether the corrugated metal sheet is missing, exposed by wind, has failed fasteners, or has holes, and whether the hidden bite is intact and the overlapped bite is firm;

[0154] 2. Whether there is large-scale rust and rust penetration on the corrugated metal plate;

[0155] 3. Whether the prefabricated large roof panels have damages such as broken ribs, open welding of embedded connections, penetration, corrosion, and falling off of fillers in the plate seams;

[0156] 4. Whether the roof structure layer is damaged, whether the waterproof layer is aged, bubbled, cracked, corroded or partially damaged, perforated, whether the drainage facilities such as gutters are seriously blocked, whether the roof has water overflowing the crest of the corrugated metal plate;

[0157] 5. Whether the retaining wall is cracked, obviously tilted, or has a damaged connection with the main structure;

[0158] 6. Check whether the doors, windows and connections have local cracks, deformation or other damage.

Claims

1. A management method for safe operation and maintenance of thermal power plant structures, characterized in that: The following steps are involved: S1 On-site investigation: Investigate the overall situation of the thermal power plant's buildings and structures, and determine the factors that affect the safe operation and maintenance of the thermal power plant's buildings and structures; S2 Determine the factors affecting the safe operation and maintenance of buildings and structures: Experts evaluate the four factors affecting the safe operation and maintenance of thermal power plant buildings and structures, namely, the use environment and conditions, importance, structural type, and construction mode, and divide the safe operation and maintenance categories of thermal power plant buildings and structures into three categories: A, B, and C: V = {v1, v2, v3} = {Class A, Class B, Class C}. Standardize the evaluation results by removing the highest and lowest values ​​and then taking the arithmetic mean to calculate the fuzzy subsets of each influencing factor on the evaluation domain V = {v1, v2, v3}, and determine the fuzzy comprehensive judgment matrix R of each building and structure. S3 Determine the comprehensive fuzzy evaluation matrix: Experts use the 1-9 scale method to construct judgment matrices for the use environment and conditions, importance, structure type, and construction mode, remove the maximum and minimum values, and take the arithmetic mean to obtain the judgment matrix A; S4 uses the AHP method to determine the weight vector: If step S4 passes the test, use matlab software to obtain the normalized eigenvector of the judgment matrix A, which is the weight vector P = (a1, a2, a3, ..., a n ), a i ≥0, if step S4 fails, the judgment matrix needs to be reconstructed; S5 consistency test: Use consistency index, random consistency index and consistency ratio for consistency test: Where CI is the matrix inconsistency index, λ max is the maximum eigenvalue of the judgment matrix, n is the matrix order, and RI is the matrix average random one-time index; S6 Fuzzy comprehensive evaluation index: Using the fuzzy operator synthesis factor weight P and the fuzzy comprehensive judgment matrix R of each building and structure, the fuzzy comprehensive evaluation index B of each building and structure of the thermal power plant is obtained, that is: where b i Indicates the safety operation and maintenance management category v of each building and structure in the thermal power plant i degree of affiliation; S7 Determine the classification standard of operation and maintenance management level: Determine the safe operation and maintenance category of thermal power plant buildings and structures according to the principle of maximum membership. For each building and structure, select the fuzzy subset with the largest membership in the domain V = {v1, v2, v3} as its safe operation and maintenance category, that is: B={b1,b2,b3} When max{b1,b2,b3}=b k , then the safety operation and maintenance management category corresponding to the building is k; S8 Safety operation and maintenance management of thermal power plant structures: According to the safety operation and maintenance management category of each structure in the thermal power plant, corresponding management measures are taken for each structure.

2. The management method for safe operation and maintenance of thermal power plant structures according to claim 1 is characterized by: In step S2, when calculating the fuzzy subset of each influencing factor on the evaluation domain V = {v1, v2, v3} by taking the arithmetic mean, one decimal place is retained.

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