CN116523296A - Risk assessment method and device for adjacent underground space of gas pipe network - Google Patents
Risk assessment method and device for adjacent underground space of gas pipe network Download PDFInfo
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Abstract
The invention relates to the technical field of risk management of gas pipe networks, and provides a gas pipe network adjacent underground space risk assessment method and device, wherein the method is used for acquiring gas leakage influence information of an assessment unit in the gas pipe network, gas diffusion aggregation information of the adjacent underground space of the assessment unit, explosion influence information after gas leakage and ignition information; determining explosion risk index parameters after gas leakage based on the leakage influence information, the gas diffusion aggregation information, the explosion influence information and the ignition information; a target risk level for each adjacent underground space is determined based on the explosion hazard index parameters. Quantitative analysis is carried out on the explosion risk of each adjacent underground space from the aspects of gas leakage, gas diffusion, gas aggregation, possibility of generating ignition sources, influence of explosion results and the like, and the consideration factors are comprehensive, so that the target risk level obtained by evaluation is objective and reliable, and the accuracy is higher. Moreover, the method can quickly locate the area where the explosion is likely to occur.
Description
Technical Field
The invention relates to the technical field of risk management of gas pipe networks, in particular to a risk assessment method and device for adjacent underground spaces of a gas pipe network.
Background
With the development of urban gas network, the use of gas is becoming popular, and the complexity of urban gas network is increasing. In the urban gas industry, accidents of unexpected leakage of gas into the air or limited space adjacent to the underground of a pipeline often occur. The gas is mixed with air after leakage, and if the concentration of the gas reaches the explosion limit range and then meets a fire source, explosion can occur. Therefore, the method has practical value for researching risk assessment of the gas pipe network causing fire and explosion due to leakage.
In the prior art, the risk level of the gas pipeline is usually estimated by combining environmental information, and the estimation method has low accuracy due to one-sided consideration factors. Moreover, the assessment method can only assess the risk level of the gas pipeline, can not assess the risk level of the adjacent space of the gas pipeline, and can not carry out technical migration.
Therefore, there is an urgent need to provide a risk assessment method for adjacent underground spaces of a gas network.
Disclosure of Invention
The invention provides a risk assessment method and device for adjacent underground spaces of a gas pipe network, which are used for solving the defects in the prior art.
The invention provides a risk assessment method for adjacent underground spaces of a gas pipe network, which comprises the following steps:
Acquiring gas leakage influence information of an evaluation unit in a gas pipe network, gas diffusion and aggregation information of adjacent underground spaces of the evaluation unit, explosion influence information after gas leakage and ignition information;
determining explosion risk index parameters after gas leakage based on the leakage influence information, the gas diffusion aggregation information, the explosion influence information and the ignition information;
and determining the target risk level of the adjacent underground space based on the explosion risk index parameter.
According to the risk assessment method for the adjacent underground space of the gas pipe network, which is provided by the invention, the adjacent underground space comprises a plurality of adjacent underground spaces;
the determining a target risk level of the adjacent underground space based on the explosion risk index parameter, then comprises:
and determining the monitoring point positions corresponding to the evaluation units based on the target risk levels of the adjacent underground spaces and the lengths of the evaluation units.
According to the risk assessment method for the adjacent underground space of the gas pipe network provided by the invention, the monitoring point positions corresponding to the assessment units are determined based on the target risk level of each adjacent underground space and the length of the assessment units, and then the method comprises the following steps:
Deleting other monitoring points in a preset range around the target monitoring point;
the target monitoring point is the monitoring point of the adjacent underground space corresponding to the highest target risk level.
According to the risk assessment method for the adjacent underground space of the gas pipe network, which is provided by the invention, the gas leakage influence information is determined based on the following steps:
determining historical leakage parameters of gas leakage based on a geographic information system, and determining influencing factor parameters of gas leakage by adopting a hierarchical analysis method based on the geographic information system; the influence factor parameters comprise external interference factor parameters, pipeline corrosion factor parameters, pipeline defect factor parameters and auxiliary facility defect factor parameters;
and determining the index weight of the influence factor parameter, and calculating the gas leakage influence information based on the influence factor parameter, the index weight of the influence factor parameter and the historical leakage parameter.
According to the risk assessment method for the adjacent underground space of the gas pipe network, the gas diffusion aggregation information is determined based on the following steps:
determining a leakage point on the evaluation unit, and determining an initial monitoring range of any point of the adjacent underground space to the evaluation unit after gas leakage occurs to the leakage point based on distance information of the leakage point and the any point;
Determining shape information of the adjacent underground space, and determining an actual monitoring range of any point to the evaluation unit after gas leakage occurs to the leakage point based on the shape information of the adjacent underground space and the initial monitoring range of the any point to the evaluation unit;
and acquiring the gas concentration of the adjacent underground space, and determining the gas diffusion aggregation information based on the gas concentration and the actual monitoring range.
According to the risk assessment method for the adjacent underground space of the gas pipe network, which is provided by the invention, the explosion influence information is determined based on the following steps:
determining the impact level of the explosion on a target object based on the overpressure of the shock wave of the explosion after the gas leakage, and determining the impact level of the explosion on an adjacent pipeline of the evaluation unit; the target object comprises a person and a building;
and determining an influence factor of the explosion based on the protection grade of the building site where the evaluation unit is located, and determining the explosion influence information based on the influence factor and the influence grade.
According to the risk assessment method for the adjacent underground space of the gas pipe network, which is provided by the invention, the ignition information is determined based on the following steps:
Determining an ignition level of the adjacent underground space based on the equipment information of the adjacent underground space and the corresponding above-ground road information;
and determining the ignition information based on the ignition level.
The invention also provides a risk assessment device for the adjacent underground space of the gas pipe network, which comprises the following steps:
the information acquisition module is used for acquiring gas leakage influence information of an evaluation unit in a gas pipe network, gas diffusion and aggregation information of adjacent underground spaces of the evaluation unit, explosion influence information after gas leakage and ignition information;
the index parameter determining module is used for determining explosion risk index parameters after gas leakage based on the leakage influence information, the gas diffusion aggregation information, the explosion influence information and the ignition information;
and the risk level determining module is used for determining the target risk level of the adjacent underground space based on the explosion risk index parameter.
The invention also provides electronic equipment, which comprises a memory, a processor and a computer program stored on the memory and capable of running on the processor, wherein the processor realizes the gas pipe network adjacent underground space risk assessment method according to any one of the above when executing the program.
The invention also provides a non-transitory computer readable storage medium, on which is stored a computer program which, when executed by a processor, implements a gas pipe network adjacent underground space risk assessment method as described in any one of the above.
The invention also provides a computer program product, which comprises a computer program, wherein the computer program is executed by a processor to realize the gas pipe network adjacent underground space risk assessment method.
The invention provides a risk assessment method and a risk assessment device for adjacent underground spaces of a gas pipe network, wherein the method comprises the following steps: acquiring gas leakage influence information of an evaluation unit in a gas pipe network, gas diffusion and aggregation information of adjacent underground spaces of the evaluation unit, explosion influence information after gas leakage and ignition information; determining explosion risk index parameters after gas leakage based on the leakage influence information, the gas diffusion aggregation information, the explosion influence information and the ignition information; a target risk level for each adjacent underground space is determined based on the explosion hazard index parameters. According to the method, quantitative analysis is carried out on the explosion risk of each adjacent underground space in the aspects of gas leakage, gas diffusion, gas aggregation, possibility of ignition source generation, influence of explosion results and the like, and the consideration factors are comprehensive, so that the target risk level obtained by evaluation is objective and reliable, and the accuracy is higher. Moreover, the method evaluates the target risk level of each adjacent underground space, and can quickly locate the area possibly exploding, thereby being beneficial to timely processing the risk.
Drawings
In order to more clearly illustrate the invention or the technical solutions of the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious to those skilled in the art that other drawings can be obtained according to these drawings without inventive effort.
FIG. 1 is a schematic flow chart of a risk assessment method for adjacent underground spaces of a gas pipe network;
FIG. 2 is a schematic diagram of adjacent underground space around an evaluation unit in a gas pipe network in the gas pipe network adjacent underground space risk evaluation method provided by the invention;
FIG. 3 is a simplified schematic diagram of an accident process of explosion of a gas pipeline in the risk assessment method of adjacent underground spaces of the gas pipeline network;
FIG. 4 is a schematic diagram of monitoring point position layout in the risk assessment method of adjacent underground spaces of a gas pipe network;
FIG. 5 is a schematic diagram of the optimized target monitoring point layout in the risk assessment method of the adjacent underground space of the gas pipe network;
FIG. 6 is a schematic diagram of determining gas leakage influence information in a risk assessment method for adjacent underground spaces of a gas pipe network;
FIG. 7 is a schematic diagram of a pipeline range from a leaking point on an evaluation unit to a W point after gas leakage occurs in a risk evaluation method for adjacent underground spaces of a gas pipe network;
FIG. 8 is a simplified flow diagram of a method for risk assessment of adjacent underground spaces of a gas pipe network provided by the invention;
FIG. 9 is a schematic structural view of a risk assessment device for adjacent underground spaces of a gas pipe network;
fig. 10 is a schematic structural diagram of an electronic device provided by the present invention.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings, and it is apparent that the described embodiments are some embodiments of the present invention, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
In the prior art, the evaluation method for the risk level of the gas pipeline only considers environmental factors, and has low accuracy compared with one-sided performance. Moreover, the assessment method can only assess the risk level of the gas pipeline, and cannot represent the risk level of the adjacent space of the gas pipeline. Based on the above, the embodiment of the invention provides a risk assessment method for the adjacent underground space of a gas network.
Fig. 1 is a schematic flow chart of a risk assessment method for adjacent underground spaces of a gas pipe network, provided in an embodiment of the present invention, as shown in fig. 1, the method includes:
s1, acquiring gas leakage influence information of an evaluation unit in a gas pipe network, gas diffusion and aggregation information of adjacent underground spaces of the evaluation unit, explosion influence information after gas leakage and ignition information;
s2, determining explosion risk index parameters after gas leakage based on the leakage influence information, the gas diffusion aggregation information, the explosion influence information and the ignition information;
and S3, determining the target risk level of the adjacent underground space based on the explosion risk index parameter.
Specifically, in the method for risk assessment of the gas pipe network adjacent underground space provided in the embodiment of the present invention, the execution main body is a gas pipe network adjacent underground space risk assessment device, and the device may be configured in a computer, where the computer may be a local computer or a cloud computer, and the local computer may be a computer, a tablet, etc., and is not limited herein specifically.
In the embodiment of the invention, before the risk assessment of the adjacent underground space of the gas pipe network is carried out, pipeline data of the gas pipe network can be acquired through a geographic information system (Geographic Information System, GIS), the gas pipe network is divided into a plurality of different assessment units according to pipe network nodes, and each assessment unit can be a section of gas pipeline of the gas pipe network. Here, the pipe network node may include a detection point, a tee, a valve, and the like.
Here, the surrounding space of each evaluation unit may be divided into one or more adjacent underground spaces, and the shape and the range of each adjacent underground space may be set according to actual conditions, which are not particularly limited herein.
As shown in fig. 2, an evaluation unit 3 is arranged between the valve 1 and the tee 2 of the gas pipe network, the surrounding space of the evaluation unit 3 is divided into 4 adjacent underground spaces, namely A, B, C, E, and the adjacent underground space D in fig. 2 belongs to the surrounding space of other evaluation units. The pentagram in fig. 2 represents a monitoring point.
In the urban gas industry, it is common for gas to leak into the air or adjacent underground spaces of gas pipelines, thereby causing accidents. The gas is mixed with air after leakage, and if the concentration of the gas reaches the explosion limit range and then meets a fire source, explosion can occur.
The formation of an explosion must be simultaneously: 1) The fuel gas leaks and has enough oxygen (air) and the volume fraction of the fuel gas is within the explosion limit; 2) An ignition source; 3) The enclosed space. Based on this, the accident process of the explosion of the gas pipeline can be simplified as shown in fig. 3, namely, the accident process of the explosion is sequentially performed by leakage, diffusion, aggregation, ignition and the explosion.
Therefore, according to the risk assessment method for the adjacent underground space of the gas pipe network, which is provided by the embodiment of the invention, according to the accident evolution mechanism, the diffusion rule and the explosion hazard, the risk assessment is respectively carried out on the adjacent underground space of the assessment unit in the gas pipe network according to the aspects of gas leakage, gas diffusion, gas and air mixed aggregation, ignition when the gas is ignited by an ignition source, the severity of the explosion result and the like, so as to find the area where the adjacent underground space of the gas pipe network is likely to generate explosion.
Firstly, executing step S1, and acquiring gas leakage influence information of an evaluation unit in a gas pipe network, gas diffusion and aggregation information of each adjacent underground space of the evaluation unit, explosion influence information after gas leakage and ignition information.
The gas leakage influence information refers to comprehensive quantitative representation of each influence factor causing the gas leakage of the evaluation unit, and the influence factors can comprise external interference factors, pipeline corrosion factors, pipeline defect factors, accessory equipment defect factors and historical leakage records.
Here, the external disturbance factors may include one or more of personnel ground activity conditions, ground buildings, construction disturbances, burial depths, public education, pipeline identification, line inspection conditions, climate, and geographic conditions. The pipe corrosion factors may include one or more of soil conditions, corrosion protection measures, operational age, and internal corrosion. Pipe defect factors may include one or more of pipeline physical properties, design, operating pressures, construction, and maintenance conditions. Accessory equipment defect factors may include one or more of valve well conditions, interface conditions, other accessory equipment conditions, accessory equipment daily monitoring and maintenance conditions. The history leakage record may include a record of the number of history leakage, etc.
The gas leakage influence information can be obtained by carrying out quantitative representation on the influence factors and then fusing the influence factors, wherein the influence factors can be quantitatively represented by means of information stored in a geographic information system.
The gas diffusion and accumulation information of each adjacent underground space of the evaluation unit refers to the comprehensive quantitative representation of the probability level of the leaked gas diffusing into each adjacent underground space and the gas concentration of each adjacent underground space after the gas leakage of the evaluation unit occurs. The probability level is the probability and can be determined by the gas diffusion distance.
The explosion influence information after the gas leakage refers to comprehensive quantitative representation of the influence of the explosion caused by the gas leakage after the gas leakage occurs in the evaluation unit to each adjacent underground space on the target object, wherein the target object can comprise personnel, buildings and adjacent pipelines of the evaluation unit. In addition, the impact of an explosion on society can be introduced based on the level of protection of the building site where the evaluation unit is located.
The ignition information refers to a quantized representation of the likelihood that each adjacent subsurface space of the evaluation unit will generate an ignition source, which may be determined in conjunction with the equipment information for each adjacent subsurface space and the corresponding above-ground road information. The equipment information may include whether or not electrical equipment is present, and the ground road information may include sidewalks and roadways.
And then executing step S2, and determining explosion risk index parameters after gas leakage by using the leakage influence information, the gas diffusion aggregation information, the explosion influence information and the ignition information. Each adjacent underground space corresponds to an explosion risk index parameter, and the explosion risk index parameter is used for representing the possibility of explosion of the corresponding adjacent underground space after the gas leakage of the evaluation unit.
The explosion risk index parameter may be obtained by multiplying leakage influence information, gas diffusion and aggregation information, explosion influence information, and ignition information. The method comprises the following steps:
R＝P 1 ×P 0 ×P 4 ×C；
wherein R is explosion hazard index parameter, P 1 To leak influence information, P 0 For gas diffusion and aggregation information, P 4 For ignition information, C is explosion influence information.
And finally, executing step S3, and determining the target risk level of each adjacent underground space by utilizing the explosion risk index parameters.
Here, a rating threshold may be introduced, and the target risk level for each adjacent underground space is determined by comparing the explosion hazard index parameter to the rating threshold. In the embodiment of the present invention, 3 level thresholds may be configured, which are respectively 150, 400, and 1200, and may be divided into 4 risk levels, as shown in table 1.
Table 1 risk classification table
The method for evaluating the risk of the adjacent underground space of the gas pipe network provided by the embodiment of the invention comprises the following steps: acquiring gas leakage influence information of an evaluation unit in a gas pipe network, gas diffusion and aggregation information of adjacent underground spaces of the evaluation unit, explosion influence information after gas leakage and ignition information; determining explosion risk index parameters after gas leakage based on the leakage influence information, the gas diffusion aggregation information, the explosion influence information and the ignition information; a target risk level for each adjacent underground space is determined based on the explosion hazard index parameters. According to the method, quantitative analysis is carried out on the explosion risk of each adjacent underground space in the aspects of gas leakage, gas diffusion, gas aggregation, possibility of ignition source generation, influence of explosion results and the like, and the consideration factors are comprehensive, so that the target risk level obtained by evaluation is objective and reliable, and the accuracy is higher. Moreover, the method evaluates the target risk level of each adjacent underground space, and can quickly locate the area possibly exploding, thereby being beneficial to timely processing the risk.
On the basis of the embodiment, the risk assessment method for the adjacent underground spaces of the gas pipe network provided by the embodiment of the invention comprises a plurality of adjacent underground spaces;
The determining a target risk level of the adjacent underground space based on the explosion risk index parameter, then comprises:
and determining the monitoring point positions corresponding to the evaluation units based on the target risk levels of the adjacent underground spaces and the lengths of the evaluation units.
Specifically, in the embodiment of the present invention, in the case where the periphery of each evaluation unit is divided into a plurality of adjacent underground spaces, the target risk level of each adjacent underground space and the length of the evaluation unit may be used to determine the monitoring point location corresponding to the evaluation unit. The monitoring point location can be provided with monitoring equipment for monitoring information such as gas concentration and the like.
Here, the number and the positions of the monitoring points corresponding to each evaluation unit can be determined according to the number of the kilometer pipeline distribution points corresponding to the risk classification and the length of each evaluation unit. For example, one monitoring point may be configured for each adjacent subsurface space, as shown in FIG. 4. The monitoring points can be arranged in the order of the target risk level from high to low, and each adjacent underground space is marked by the target risk level of each adjacent underground space in fig. 4.
In the embodiment of the invention, the monitoring point positions corresponding to the evaluation units are determined by combining the target risk levels of the adjacent underground spaces and the lengths of the evaluation units, so that the set monitoring point positions can be more reasonable.
On the basis of the foregoing embodiments, the method for risk assessment of adjacent underground spaces of a gas pipe network according to the embodiments of the present invention determines a monitoring point corresponding to an assessment unit based on a target risk level of each adjacent underground space and a length of the assessment unit, and then includes:
deleting other monitoring points in a preset range around the target monitoring point;
the target monitoring point is the monitoring point of the adjacent underground space corresponding to the highest target risk level.
Specifically, in the embodiment of the invention, after the monitoring points corresponding to the evaluation unit are determined, each monitoring point can be screened, that is, the target monitoring point of the adjacent underground space corresponding to the highest target risk level among all the monitoring points configured around the evaluation unit is determined, then other monitoring points in the preset range around the target monitoring point are deleted, that is, only one monitoring point of the target monitoring point exists in the preset range around the target monitoring point, and the information such as the gas concentration is monitored through the target monitoring point.
It is understood that the preset range may be a circular area, for example, an area range surrounded by a circumference with the target monitoring point as a center and with the preset length as a radius. The preset length may be determined according to practical situations, and may be set to 12.5m, for example. As shown in fig. 5, only the target monitoring points of the adjacent underground spaces of the target risk level are reserved for monitoring the information such as the gas concentration of all the adjacent underground spaces around the preset range.
In addition, the preset range may be a rectangular area, other regular-shaped or irregular-shaped areas, which are not particularly limited herein.
In the embodiment of the invention, the arrangement of the monitoring points in the underground space is optimized by deleting other monitoring points in the preset range around the target monitoring point, so that the underground space in the maximum range can be monitored by the minimum monitoring equipment, the monitoring purpose is achieved, and the monitoring cost can be reduced.
On the basis of the embodiment, the risk assessment method for the adjacent underground space of the gas pipe network provided by the embodiment of the invention is characterized in that the gas leakage influence information is determined based on the following steps:
determining historical leakage parameters of gas leakage based on a geographic information system, and determining influencing factor parameters of gas leakage by adopting a hierarchical analysis method based on the geographic information system; the influence factor parameters comprise external interference factor parameters, pipeline corrosion factor parameters, pipeline defect factor parameters and auxiliary facility defect factor parameters;
and determining the index weight of the influence factor parameter, and calculating the gas leakage influence information based on the influence factor parameter, the index weight of the influence factor parameter and the historical leakage parameter.
Specifically, in the embodiment of the present invention, as shown in fig. 6, when determining the gas leakage influence information, the geographic information system may be used to determine the historical leakage parameters of the gas leakage, and the geographic information system may be used to determine the influence factor parameters by using a hierarchical analysis method. The geographical information system can store related data of the gas pipe network and adjacent underground spaces thereof, and the related information can be obtained through early-stage on-site investigation, gas pipe network general investigation and materials provided by gas companies. The introduction of the geographic information system can ensure that data required by evaluation can be acquired efficiently and accurately, reduce subjective influence of people on evaluation results, and enable the evaluation results to be objective and reliable.
The influencing factor parameters may include external disturbance factor parameter P 11 Pipeline corrosion factor parameter P 12 Pipe defect factor parameter P 13 Auxiliary facility defect factor parameter P 14 。
External interference factor parameter P 11 Can be based on personnel ground activity parameters P 111 Floor construction parameters P 112 Construction interference parameter P 113 Minimum burial depth parameter P of pipeline 114 Public education parameter P 115 Pipeline identification parameter P 116 Line inspection frequency parameter P 117 Environmental condition parameter P 118 Is determined by the weighted sum of (a). The weights adopted during weighting can be determined by using an analytic hierarchy process, so as to construct a judgment matrix, wherein the judgment matrix is composed of the weights of the parameters.
Personnel ground activity parameter P 111 Maximum population density ρ of the above-ground area where the evaluation unit, which can be read in the geographical information system, is located 1 Maximum traffic density ρ 2 The determination is that:
P 111 ＝ρ 1 +ρ 2 。
floor construction parameter P 112 It can be determined from the information about whether there is building coverage above the evaluation unit read in the geographical information system, namely:
construction interference parameter P 113 It can be determined by evaluating whether there is information about the construction project around the unit, namely:
pipeline minimum burial depth parameter P 114 May be from a geographical information systemMinimum burial depth data of the evaluation units read in the system.
When the evaluation unit is located in the motor vehicle lane:
when the evaluation unit is located in a non-motor vehicle lane:
when the evaluation unit is located in a non-motor vehicle lane:
public education parameter P 115 The method can be determined according to the related information of whether the gas formula is used for propaganda education, namely:
pipeline identification parameter P 116 It can be determined by the identification of the pipeline printed on the evaluation unit, namely:
line inspection frequency parameter P 117 The number of inspection times of the evaluation unit in a preset time period can be determined, namely:
environmental condition parameter P 118 The climate and the geographic conditions of the area where the evaluation unit can be read by the geographic information system are determined, namely:
Thereby, the external disturbance factor parameter P 11 The determination can be made by the following formula:
P 11 ＝0.10P 111 +0.10P 112 +0.18P 113 +0.08P 114 +0.08P 115 +0.15P 116 +0.10P 117 +0.21P 118 。
pipeline corrosion factor parameter P 12 Can pass through the soil condition parameter P 121 Parameter P of anti-corrosion measure 122 Operational life parameter P 123 Parameter P of inner corrosion 124 Is determined by the weighted sum of (a). The weights used in the weighting may also be determined using analytic hierarchy process.
Soil condition parameter P 121 The soil resistivity, the water content, the pH value and other data can be determined according to all information in the geographic information system, namely:
parameter P of anti-corrosion measure 122 The determination of whether the evaluation unit takes the preservative measures or not can be based on the relevant information of all the information obtained in the geographic information system, namely:
operational life parameter P 123 Design period T of evaluation unit provided by gas company 0 Actual operating period T 1 The determination is that:
inner corrosion parameter P 124 Can be from a geographic information systemThe acquired trend information of the evaluation unit is determined by:
thus, pipe corrosion factor parameter P 12 The determination can be made by the following formula:
P 12 ＝0.17P 121 +0.33P 122 +0.33P 123 +0.17P 124 。
pipe defect factor parameter P 13 Can pass through pipeline physical property parameter P 131 Pressure parameter P 132 Post parameter P 133 Is determined by the weighted sum of (a). The weights used in the weighting may also be determined using analytic hierarchy process.
Pipeline physical property parameter P 131 Can be determined based on design criteria of pipe diameter, wall thickness, etc., namely:
pressure parameter P 132 The determination may be based on whether the design pressure meets the design criteria, whether the operating pressure meets the design requirements, or both:
post parameter P 133 The method can be determined according to the related information of whether the evaluation unit is constructed according to the design requirement and whether the evaluation unit is regularly maintained, namely:
thereby, the pipe defect factor parameter P 13 The determination can be made by the following formula:
P 13 ＝0.34P 131 +0.33P 132 +0.33P 133 。
auxiliary facility defect factor parameter P 14 Through valve well, interface condition parameter P 141 Other accessory facility condition parameters P 142 Daily monitoring and maintenance parameters P of auxiliary facilities 143 Is determined by the weighted sum of (a). The weights used in the weighting may also be determined using analytic hierarchy process.
Valve well, interface condition parameter P 141 The determination may be based on the following formula:
other auxiliary facility condition parameters P 142 The determination may be based on the following formula:
auxiliary facility daily monitoring and maintenance parameter P 143 The determination may be based on the following formula:
thereby, the auxiliary facility defect factor parameter P 14 The determination can be made by the following formula:
P 14 ＝0.31P 141 +0.31P 142 +0.38P 143 。
historical leakage parameter P' 1 It can be determined by the number of line leaks, the greater the number of leaks, the greater the attention that should be drawn. If the number of pipeline leaks is k, then there are:
Thereafter, the analytic hierarchy process may be utilized again to determine the index weight of each influencing factor parameter and utilize the influencing factor parameterWeighting the influence factor parameters according to the weighted result and the historical leakage parameters, and calculating the gas leakage influence information P 1 . The method comprises the following steps:
P 1 ＝(0.61P 11 +0.27P 12 +0.06P 13 +0.06P 14 )×P′ 1 。
in the embodiment of the invention, the obtained gas leakage influence information has higher accuracy and accords with the actual situation by means of a geographic information system and an analytic hierarchy process.
On the basis of the embodiment, the risk assessment method for the adjacent underground space of the gas pipe network provided by the embodiment of the invention is characterized in that the gas diffusion aggregation information is determined based on the following steps:
determining a leakage point on the evaluation unit, and determining an initial monitoring range of any point of the adjacent underground space to the evaluation unit after gas leakage occurs to the leakage point based on distance information of the leakage point and the any point;
determining shape information of the adjacent underground space, and determining an actual monitoring range of any point to the evaluation unit after gas leakage occurs to the leakage point based on the shape information of the adjacent underground space and the initial monitoring range of the any point to the evaluation unit;
And acquiring the gas concentration of the adjacent underground space, and determining the gas diffusion aggregation information based on the gas concentration and the actual monitoring range.
Specifically, when determining the gas diffusion and accumulation information, a leak point on the evaluation unit may be determined first, where any point on the evaluation unit may be regarded as a leak point. And then determining the monitoring range information of any point on the leakage point after the gas leakage of the leakage point occurs by utilizing the distance information of the leakage point and any point in the adjacent underground space.
If the distance between the leakage point and any point W in the adjacent underground space is d, the distance is a diffusion distance, a probability function P exists between the leakage point and the fuel gas which can be detected by the any point W, and the method comprises the following steps:
the diffusion distance has a minimum value R min And maximum value R max When d is less than or equal to R min When the gas leakage of the leakage point can be detected by any point W, the effective monitoring probability P=1; when d > R max When the gas leakage point is not detected, the effective monitoring probability P=0; when R is min ＜d≤R max In this case, there is a functional relationship between the effective monitoring probability P and the diffusion distance, assuming that p=f (d), d is a continuous random variable, namely:
Further, as shown in FIG. 7, the initial monitoring range L of the evaluation unit is set at any point W after the gas leakage occurs at the leakage point 1 I.e. the length of the pipeline where the gas leaking from the leak point may spread to any point W, can be determined by the following formula:
the shape information of the adjacent underground space can be round or square, and for the round space with the radius r, the actual monitoring range L of any point W to the evaluation unit after the leakage point is leaked with fuel gas 2 The determination can be made by the following formula:
for a rectangular space with length and width of a and b, L 2 The determination can be made by the following formula:
finally, the gas concentration c of the adjacent underground space is obtained, and the gas concentration c can be obtained through the general investigation result of the gas pipeline.Further, the gas concentration c and the actual monitoring range L 2 And determining gas diffusion and aggregation information.
Here, the relative grade corresponding to the gas concentration c can be determined by the following formula:
/>
then, the relative grade P corresponding to the gas concentration c can be calculated 3 And the actual monitoring range L 2 And can use the summation result as the gas diffusion gathering information P 0 。
In the embodiment of the invention, the actual monitoring range of any point to the evaluation unit is determined by combining the shape information of the adjacent underground space and the distance information of the leakage point on the evaluation unit and any point in the adjacent underground space, so that the actual monitoring range is more accurate, and the obtained gas diffusion and aggregation information is more reliable.
On the basis of the embodiment, the risk assessment method for the adjacent underground space of the gas pipe network provided by the embodiment of the invention is characterized in that the explosion influence information is determined based on the following steps:
determining the impact level of the explosion on a target object based on the overpressure of the shock wave of the explosion after the gas leakage, and determining the impact level of the explosion on an adjacent pipeline of the evaluation unit; the target object comprises a person and a building;
and determining an influence factor of the explosion based on the protection grade of the building site where the evaluation unit is located, and determining the explosion influence information based on the influence factor and the influence grade.
In particular, when determining the explosion influence information, the damage degree of the shock wave overpressure of the gas leakage and then the explosion to the target object can be determined first. The target object may include a person and a building.
The extent of injury to personnel by shock wave overpressure is shown in table 2.
TABLE 2 injury extent of shock wave overpressure to human body
The extent of damage to the building by the overpressure of the shock wave is shown in table 3.
TABLE 3 extent of injury to buildings by shock wave overpressure
In determining the impact level of an explosion on a person, the injury radius R of the shock wave overpressure on the person can be determined p The unit is m. Here, the person is subjected to a slight contusion as a judgment condition, and the corresponding shock wave overpressure is 0.02MPa. Let Δp=0.02, the proportional distance Z is calculated according to the following formula in units of
ΔP＝0.137Z -3 +0.119Z -2 +0.267Z -1 -0.019。
According to the proportional distance Z, the injury radius R is calculated by the following formula p 。
Wherein W is TNT TNT equivalent of fuel gas is expressed in kg.
Thereafter, the maximum personnel density ρ of the above-ground region corresponding to the adjacent underground space described in the geographic information system can be combined according to the injury radius 1 Maximum motor vehicle density ρ 2 Determining the level of influence C of an explosion on a person 1 . The method comprises the following steps:
C′ 1 ＝R p ρ 1 ；
C″ 1 ＝R p ρ 2 ；
C 1 ＝C′ 1 +0·2C″ 1 。
wherein C' 1 Parameters representing the influence of explosion of adjacent underground spaces of the gas pipe network on personnel in an overground area; c' 1 And the parameters representing the influence of the explosion of the adjacent underground space of the gas pipe network on the personnel in the motor vehicle in the overground area.
In determining the level of influence C of an explosion on a building 2 When this is done, this can be achieved by the following formula.
The level of impact of an explosion on adjacent pipes of the evaluation unit can be characterized by the number n of adjacent pipes within a radius of 1m around the adjacent underground space. The method comprises the following steps:
C 3 ＝n。
thereafter, the impact factor of the explosion is determined using the protection level of the building site where the evaluation unit is located. The influencing factor may be the social influence caused by the explosion, namely:
Thereafter, the explosion influence information C may be obtained by weighting the influence levels and multiplying with the influence factor. The weights used in weighting the impact levels can be obtained by analytic hierarchy process, namely:
C＝(0.65C 1 +0.28C 2 +0.07C 3 )×C 4 。
in the embodiment of the invention, the explosion result can be comprehensively evaluated by utilizing the influence level of the explosion on the target object and the protection level of the building place where the evaluation unit is positioned, so that the obtained explosion influence information is more accurate.
On the basis of the embodiment, the risk assessment method for the adjacent underground space of the gas pipe network provided by the embodiment of the invention is characterized in that the ignition information is determined based on the following steps:
determining an ignition level of the adjacent underground space based on the equipment information of the adjacent underground space and the corresponding above-ground road information;
and determining the ignition information based on the ignition level.
Specifically, when determining the ignition information, the ignition level K of the adjacent underground space may be determined first using the equipment information of the adjacent underground space and the corresponding above-ground road information. The ignition level K can be expressed as:
with the ignition level, the information can be ignited by the following formula:
wherein K is max ＝4。
In summary, according to the method for evaluating the risk of the adjacent underground space of the gas pipe network provided by the embodiment of the invention, the gas pipe network is firstly divided into evaluation units, then the probability risk evaluation method and the analytic hierarchy process are applied, quantitative analysis is carried out on the possibility of gas leakage, gas diffusion, gas aggregation and ignition source generation and the influence of explosion results according to the data obtained from the geographic information system, the analytic hierarchy process is applied to determine the weight of each parameter, the explosion risk index parameter used for representing the explosion risk of the adjacent underground space of the gas pipe network is obtained, and the explosion risk index parameter after gas leakage is classified to obtain the target risk grade. And finally, determining the monitoring points to be laid according to the target risk level from high to low, and defining the target monitoring points of the adjacent underground space with the highest target risk level as the center, and drawing a circle with a radius of 12.5m, wherein the area covered by the circle is not provided with the monitoring points. The above process can be simplified to fig. 8. Therefore, the arrangement of the underground space monitoring points can be optimized, the underground space with the largest range can be monitored by the minimum monitoring equipment, the monitoring purpose is achieved, and the monitoring cost can be reduced.
As shown in fig. 9, on the basis of the above embodiment, in the embodiment of the present invention, there is provided a risk assessment device for an adjacent underground space of a gas pipe network, including:
an information acquisition module 91, configured to acquire gas leakage influence information of an evaluation unit in a gas pipe network, gas diffusion and aggregation information of an adjacent underground space of the evaluation unit, explosion influence information after gas leakage, and ignition information;
an index parameter determining module 92, configured to determine an explosion risk index parameter after gas leakage based on the leakage influence information, the gas diffusion aggregation information, the explosion influence information, and the ignition information;
a risk level determining module 93, configured to determine a target risk level of the adjacent underground space based on the explosion risk index parameter.
On the basis of the embodiment, the risk assessment device for the adjacent underground spaces of the gas pipe network provided by the embodiment of the invention comprises a plurality of adjacent underground spaces;
the monitoring point position determining module is used for:
and determining the monitoring point positions corresponding to the evaluation units based on the target risk levels of the adjacent underground spaces and the lengths of the evaluation units.
On the basis of the above embodiment, the risk assessment device for the adjacent underground space of the gas pipe network provided by the embodiment of the invention further comprises a monitoring point location optimization module, which is used for:
deleting other monitoring points in a preset range around the target monitoring point;
the target monitoring point is the monitoring point of the adjacent underground space corresponding to the highest target risk level.
On the basis of the above embodiment, the risk assessment device for the adjacent underground space of the gas pipe network provided in the embodiment of the present invention, the information acquisition module is specifically configured to:
determining historical leakage parameters of gas leakage based on a geographic information system, and determining influencing factor parameters of gas leakage by adopting a hierarchical analysis method based on the geographic information system; the influence factor parameters comprise external interference factor parameters, pipeline corrosion factor parameters, pipeline defect factor parameters and auxiliary facility defect factor parameters;
and determining the index weight of the influence factor parameter, and calculating the gas leakage influence information based on the influence factor parameter, the index weight of the influence factor parameter and the historical leakage parameter.
On the basis of the above embodiment, the risk assessment device for the adjacent underground space of the gas pipe network provided in the embodiment of the present invention, the information acquisition module is further specifically configured to:
Determining a leakage point on the evaluation unit, and determining an initial monitoring range of any point of the adjacent underground space to the evaluation unit after gas leakage occurs to the leakage point based on distance information of the leakage point and the any point;
determining shape information of the adjacent underground space, and determining an actual monitoring range of any point to the evaluation unit after gas leakage occurs to the leakage point based on the shape information of the adjacent underground space and the initial monitoring range of the any point to the evaluation unit;
and acquiring the gas concentration of the adjacent underground space, and determining the gas diffusion aggregation information based on the gas concentration and the actual monitoring range.
On the basis of the above embodiment, the risk assessment device for the adjacent underground space of the gas pipe network provided in the embodiment of the present invention, the information acquisition module is further specifically configured to:
determining the impact level of the explosion on a target object based on the overpressure of the shock wave of the explosion after the gas leakage, and determining the impact level of the explosion on an adjacent pipeline of the evaluation unit; the target object comprises a person and a building;
and determining an influence factor of the explosion based on the protection grade of the building site where the evaluation unit is located, and determining the explosion influence information based on the influence factor and the influence grade.
On the basis of the above embodiment, the risk assessment device for the adjacent underground space of the gas pipe network provided in the embodiment of the present invention, the information acquisition module is further specifically configured to:
determining an ignition level of the adjacent underground space based on the equipment information of the adjacent underground space and the corresponding above-ground road information;
and determining the ignition information based on the ignition level.
Specifically, the functions of each module in the gas pipe network adjacent underground space risk assessment device provided in the embodiment of the present invention are in one-to-one correspondence with the operation flows of each step in the above method embodiment, and the achieved effects are consistent.
Fig. 10 illustrates a physical structure diagram of an electronic device, as shown in fig. 10, which may include: processor 1010, communication interface (Communications Interface) 1020, memory 1030, and communication bus 1040, wherein Processor 1010, communication interface 1020, and Memory 1030 communicate with each other via communication bus 1040. Processor 1010 may invoke logic instructions in memory 1030 to perform the gas pipe network adjacent underground space risk assessment method provided in the above embodiments, the method comprising: acquiring gas leakage influence information of an evaluation unit in a gas pipe network, gas diffusion and aggregation information of adjacent underground spaces of the evaluation unit, explosion influence information after gas leakage and ignition information; determining explosion risk index parameters after gas leakage based on the leakage influence information, the gas diffusion aggregation information, the explosion influence information and the ignition information; and determining the target risk level of the adjacent underground space based on the explosion risk index parameter.
Further, the logic instructions in the memory 1030 described above may be implemented in the form of software functional units and stored in a computer readable storage medium when sold or used as a stand alone product. Based on this understanding, the technical solution of the present invention may be embodied essentially or in a part contributing to the prior art or in a part of the technical solution, in the form of a software product stored in a storage medium, comprising several instructions for causing a computer device (which may be a personal computer, a server, a network device, etc.) to perform all or part of the steps of the method according to the embodiments of the present invention. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a random access Memory (Random Access Memory, RAM), a magnetic disk, or an optical disk, or other various media capable of storing program codes.
In another aspect, the present invention also provides a computer program product, where the computer program product includes a computer program, where the computer program can be stored on a non-transitory computer readable storage medium, where the computer program when executed by a processor can perform the method for evaluating risk of adjacent underground space of a gas pipe network provided in the foregoing embodiments, and the method includes: acquiring gas leakage influence information of an evaluation unit in a gas pipe network, gas diffusion and aggregation information of adjacent underground spaces of the evaluation unit, explosion influence information after gas leakage and ignition information; determining explosion risk index parameters after gas leakage based on the leakage influence information, the gas diffusion aggregation information, the explosion influence information and the ignition information; and determining the target risk level of the adjacent underground space based on the explosion risk index parameter.
In yet another aspect, the present invention further provides a non-transitory computer readable storage medium having stored thereon a computer program, which when executed by a processor, is implemented to perform the method for risk assessment of adjacent underground spaces of a gas pipe network provided in the above embodiments, the method comprising: acquiring gas leakage influence information of an evaluation unit in a gas pipe network, gas diffusion and aggregation information of adjacent underground spaces of the evaluation unit, explosion influence information after gas leakage and ignition information; determining explosion risk index parameters after gas leakage based on the leakage influence information, the gas diffusion aggregation information, the explosion influence information and the ignition information; and determining the target risk level of the adjacent underground space based on the explosion risk index parameter.
The apparatus embodiments described above are merely illustrative, wherein the elements illustrated as separate elements may or may not be physically separate, and the elements shown as elements may or may not be physical elements, may be located in one place, or may be distributed over a plurality of network elements. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of this embodiment. Those of ordinary skill in the art will understand and implement the present invention without undue burden.
From the above description of the embodiments, it will be apparent to those skilled in the art that the embodiments may be implemented by means of software plus necessary general hardware platforms, or of course may be implemented by means of hardware. Based on this understanding, the foregoing technical solution may be embodied essentially or in a part contributing to the prior art in the form of a software product, which may be stored in a computer readable storage medium, such as ROM/RAM, a magnetic disk, an optical disk, etc., including several instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to execute the method described in the respective embodiments or some parts of the embodiments.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present invention, and are not limiting; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present invention.
Claims (10)
1. A method for risk assessment of adjacent underground spaces of a gas pipe network, comprising the steps of:
acquiring gas leakage influence information of an evaluation unit in a gas pipe network, gas diffusion and aggregation information of adjacent underground spaces of the evaluation unit, explosion influence information after gas leakage and ignition information;
determining explosion risk index parameters after gas leakage based on the leakage influence information, the gas diffusion aggregation information, the explosion influence information and the ignition information;
and determining the target risk level of the adjacent underground space based on the explosion risk index parameter.
2. The method for risk assessment of adjacent underground spaces of a gas pipe network according to claim 1, wherein the adjacent underground spaces comprise a plurality of;
the determining a target risk level of the adjacent underground space based on the explosion risk index parameter, then comprises:
and determining the monitoring point positions corresponding to the evaluation units based on the target risk levels of the adjacent underground spaces and the lengths of the evaluation units.
3. The method for risk assessment of adjacent underground spaces of a gas pipe network according to claim 2, wherein the determining the monitoring point location corresponding to the assessment unit based on the target risk level of each adjacent underground space and the length of the assessment unit comprises:
Deleting other monitoring points in a preset range around the target monitoring point;
the target monitoring point is the monitoring point of the adjacent underground space corresponding to the highest target risk level.
4. A gas pipe network adjacent underground space risk assessment method according to any one of claims 1-3, wherein said gas leakage impact information is determined based on the steps of:
determining historical leakage parameters of gas leakage based on a geographic information system, and determining influencing factor parameters of gas leakage by adopting a hierarchical analysis method based on the geographic information system; the influence factor parameters comprise external interference factor parameters, pipeline corrosion factor parameters, pipeline defect factor parameters and auxiliary facility defect factor parameters;
and determining the index weight of the influence factor parameter, and calculating the gas leakage influence information based on the influence factor parameter, the index weight of the influence factor parameter and the historical leakage parameter.
5. A gas pipe network adjacent underground space risk assessment method according to any one of claims 1-3, wherein said gas diffusion gathering information is determined based on the steps of:
Determining a leakage point on the evaluation unit, and determining an initial monitoring range of any point of the adjacent underground space to the evaluation unit after gas leakage occurs to the leakage point based on distance information of the leakage point and the any point;
determining shape information of the adjacent underground space, and determining an actual monitoring range of any point to the evaluation unit after gas leakage occurs to the leakage point based on the shape information of the adjacent underground space and the initial monitoring range of the any point to the evaluation unit;
and acquiring the gas concentration of the adjacent underground space, and determining the gas diffusion aggregation information based on the gas concentration and the actual monitoring range.
6. A gas pipe network adjacent underground space risk assessment method according to any one of claims 1-3, wherein said explosion impact information is determined based on the steps of:
determining the impact level of the explosion on a target object based on the overpressure of the shock wave of the explosion after the gas leakage, and determining the impact level of the explosion on an adjacent pipeline of the evaluation unit; the target object comprises a person and a building;
and determining an influence factor of the explosion based on the protection grade of the building site where the evaluation unit is located, and determining the explosion influence information based on the influence factor and the influence grade.
7. A gas pipe network adjacent underground space risk assessment method according to any one of claims 1-3, wherein said ignition information is determined based on the steps of:
determining an ignition level of the adjacent underground space based on the equipment information of the adjacent underground space and the corresponding above-ground road information;
and determining the ignition information based on the ignition level.
8. A gas pipe network adjacent underground space risk assessment device, comprising:
the information acquisition module is used for acquiring gas leakage influence information of an evaluation unit in a gas pipe network, gas diffusion and aggregation information of adjacent underground spaces of the evaluation unit, explosion influence information after gas leakage and ignition information;
the index parameter determining module is used for determining explosion risk index parameters after gas leakage based on the leakage influence information, the gas diffusion aggregation information, the explosion influence information and the ignition information;
and the risk level determining module is used for determining the target risk level of the adjacent underground space based on the explosion risk index parameter.
9. An electronic device comprising a memory, a processor, and a computer program stored on the memory and executable on the processor, wherein the processor, when executing the program, implements the gas pipe network adjacent underground space risk assessment method of any one of claims 1-7.
10. A non-transitory computer readable storage medium having stored thereon a computer program, wherein the computer program when executed by a processor implements the gas pipe network adjacent underground space risk assessment method of any one of claims 1-7.
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| CN116973523B (en) * | 2023-09-22 | 2023-12-15 | 深圳市智芯微纳科技有限公司 | MEMS gas sensor array-based gas detection method and system |
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