Heat distribution pipeline medium temperature drop calculation method based on heat dissipation simulation test result

Abstract

The invention discloses a heat distribution pipeline medium temperature drop calculation method based on a heat dissipation simulation test result, and relates to the technical field of heating and heat supply heat distribution pipelines, S01, a heat supply pipe network is created through matching in a model library based on a design blueprint, and a heat preservation structure matched with straight pipe sections and local pipe fittings in the heat supply pipe network is automatically generated according to the straight pipe sections and the local pipe fittings; obtaining a pipe network test model; s02, flow of a matched conveying medium in the heat supply pipe network is simulated, the outer surface temperature and heating power data of the heat preservation structure are collected in real time, and then the linear heat flow density value ql straight pipe of the straight pipe section and the linear heat flow density value ql local i of the local pipe fitting are calculated; and S03, according to the total length L of the full-length middle straight pipe section in the heat supply pipe network, the straight pipe is obtained. According to the method, the heat dissipation loss and the medium temperature drop of the pipe network can be estimated more accurately, and a thermal insulation performance comprehensive evaluation system is optimized, so that a more practical guidance value is provided for thermal parameter determination, engineering design and thermal insulation structure optimization.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of heat supply pipeline, in particular to a heat supply pipeline medium temperature drop calculation method based on heat dissipation simulation test results. BACKGROUND

[0002] In order to reduce the heat loss of heat supply steam and heating hot water in the process of heat medium transportation, the transportation pipeline must be insulated. Moreover, due to the long distance of pipeline transportation of the heat supply pipeline network, if the insulation effect of the pipeline cannot be guaranteed, the total heat loss of the pipeline will be very large, which not only significantly reduces the economy of pipeline operation, but also causes excessive temperature drop of the heat medium transported in the pipeline, so that the temperature requirement of the user end for the medium at the outlet of the pipeline network cannot be met, which seriously affects the downstream production process and product quality, and causes significant economic losses. Therefore, it is very important to effectively test and evaluate the insulation effect of the heat supply pipeline.

[0003] The parameters of the medium transported in the pipeline and the engineering meteorological environmental conditions will affect the insulation performance of the insulated pipeline, that is, the same pipeline insulation structure will exhibit different insulation performance under different parameters of the medium transported in the pipeline and engineering meteorological environmental conditions. The use of the total temperature drop value of the medium transported in the pipeline as a parameter index for evaluating and measuring the insulation performance and effect of the insulated pipeline can include these influencing factors in the comprehensive evaluation system. Therefore, it is also necessary for the test and evaluation results of the insulated pipeline to fully reflect the temperature drop of the medium transported in the pipeline under the engineering meteorological environmental conditions. However, the main test and evaluation objects of the current standards and specifications for testing and evaluating the insulation effect of the pipeline, such as GB / T 4272-2008 "General rules for insulation of equipment and piping" and GB / T 8174-2008 "Test and evaluation of insulation effect of equipment and piping", are the surface temperature and heat loss heat flux density value of the insulation structure, which lacks the medium temperature drop value that can directly reflect the purpose and effect of the heat supply pipeline insulation, and the limit value provided is too general and does not distinguish different transportation media and different application scenarios, which lacks guiding value and significance for actual heat supply pipeline insulation engineering.

[0004] In addition, there is a large difference between the current relevant standards and the actual engineering environmental conditions, such as the requirement in the 5.7th clause of GB / T 8174-2008 "Test and evaluation of insulation effect of equipment and piping" that the test should be conducted under the condition that the wind speed is equal to or less than 0.5 m / s, which is seriously inconsistent with the actual engineering environmental wind speed condition, and the test results under this condition have a large deviation from the actual heat loss of the insulated pipeline. As for the requirement for the test environmental temperature, the 7.1.2th clause of the standard provides that the temperature difference is proportionally converted, that is, q=q´×(T1-T2) / T1, which is inconsistent with the actual engineering environmental temperature condition.m ) ÷ (T 1´ -T m´ ), wherein q is the converted heat dissipation loss, q' is the tested heat dissipation loss, T1 is the annual (or local operation period) average outer surface temperature of the pipeline insulation structure, T 1´ is the outer surface temperature of the pipeline insulation structure during the test, T m is the annual (or local operation period) average ambient temperature, and T m´ is the ambient temperature during the test. For the average temperature T1 of the insulation outer surface of a long-distance heat supply pipeline, it is difficult to accurately measure the value, and the data of T1 value cannot be obtained until the pipeline is put into operation for a certain period, that is, the conversion method is a post-processing algorithm, so that the test and evaluation work loses the leading role and value.

[0005] In summary, the measurement and evaluation method in the current relevant standard specification is also lacking in terms of meeting the engineering meteorological environmental conditions. The pipeline insulation and heat insulation performance data obtained by testing according to the requirements of such standard specifications cannot truly reflect the actual insulation and heat insulation effect of the pipeline insulation under the engineering meteorological environmental conditions, and cannot accurately grasp the temperature drop of the conveying medium in the pipeline and the medium temperature at the pipeline end outlet, so that the requirements of the user end for the medium parameters cannot be guaranteed. SUMMARY

[0006] In view of the above technical problems, the technical scheme adopted by the present application is a heat supply pipeline medium temperature drop calculation method based on heat dissipation simulation test results, comprising the following steps:

[0007] S01, creating a heat supply pipe network based on a design blueprint by matching a model library, and automatically generating an insulation structure adapted to straight pipe sections and local pipe fittings in the heat supply pipe network to obtain a pipe network test model;

[0008] S02, simulating the flow of the conveying medium in the heat supply pipe network, and collecting the outer surface temperature and heating power data of the insulation structure in real time, and then calculating the linear heat flux density value ql 直管 of the straight pipe section and the linear heat flux density value ql 局部i of the local pipe fitting, respectively;

[0009] S03, calculating the total heat dissipation flow value under the rated working condition and the most unfavorable working condition according to the total length L 直管 of the straight pipe section in the heat supply pipe network, the single piece development length L 局部i and the number n 局部i of the local pipe fitting;

[0010] Q = ql 直管 × L 直管 + ∑ql 局部i × L局部i ×n 局部 ;

[0011] S04, Using Q as the enthalpy drop of the medium throughout the entire process. Based on user-end requirements parameters, and through the heat balance equation And calculate the initial temperature t based on the medium type. 起始端 and pressure value p 起始端 ;

[0012] S05. Calculate the average temperature drop of the medium per unit length of a thermal pipe. And generate a comprehensive evaluation model of the insulation effect by combining the outer surface temperature of the insulation structure and the heat flux density value of the heat loss;

[0013] S06. A margin is set based on the calculated value of the medium parameter at the starting end under rated operating conditions as the outlet thermal medium parameter under rated operating conditions. Similarly, a necessary margin is set based on the starting end medium parameter under the most unfavorable operating conditions as the adjustment range and upper limit of the outlet medium parameter.

[0014] Preferably, the local fittings include compensating joints, elbow joints, drainage joints, and fixing joints.

[0015] Preferably, the starting temperature t 起始端 and pressure value p 起始端 The calculation method includes: the temperature t at the starting end of the heating steam. 起始端 and pressure value p 起始端 This includes the following steps:

[0016] S41, User-side pressure p 用户端 Convert to absolute pressure p 用户端 =(p 用户端 +101325) / 10 5 ;

[0017] S42, User-side temperature t 用户端 Convert to absolute temperature T 用户端 =t 用户端 +273.15;

[0018] S43, T 用户端 and P 用户端 Substituting into equation (1), the steam enthalpy h of the parameters required per unit mass of the user end is obtained. 用户端 ;

[0019] ;

[0020] S44. The heat dissipation flow rate Q of the entire pipeline under rated operating conditions. nom The heat dissipation flow rate Q along the entire pipeline under the most unfavorable operating condition.max respectively into the formula h 起始端 = h 用户端 + Q, the heating hot water enthalpy h 起始端n and h 起始端m at the starting end of the pipeline under the corresponding working conditions are calculated, and then the formula h = 0.001 x t 2 + 4.074 x t is used to inversely calculate the heating hot water temperature t 起始端n and t 起始端m at the starting end of the pipeline under the rated working condition and the most unfavorable working condition.

[0021] S45, the whole flow resistance value Δp nom of the heating steam in the pipeline under the rated working condition and the whole flow resistance value Δp max of the heating steam in the pipeline under the most unfavorable working condition are calculated, and then the formula p 起始端 = p 用户端 + Δp is used to calculate the heating steam pressure p 起始端n and p 起始端m at the starting end of the pipeline under the corresponding working conditions, and then the formula (1) is used to inversely calculate the heating steam temperature t 起始端n and t 起始端m at the starting end under the rated working condition and the most unfavorable working condition.

[0022] As preferred, the calculation method of the starting end temperature t 起始端 and the pressure value p 起始端 includes the following steps for the temperature t 起始端 and the pressure value p 起始端 at the starting end of the heating hot water:

[0023] S46, the required hot water temperature t 用户端 in Celsius at the user end is substituted into (2) to calculate the hot water enthalpy h 用户端 of the required parameter per unit mass at the user end.

[0024] h = 0.001 x t nom + 4.074 x t (2);

[0025] S47, the whole flow resistance value Δp max of the heating hot water in the pipeline under the rated working condition and the whole flow resistance value Δp 起始端 of the heating hot water in the pipeline under the most unfavorable working condition are calculated, and then the formula p 用户端 = p 起始端n + Δp is used to calculate the heating hot water pressure p 起始端m at the starting end of the pipeline under the corresponding working conditions.

[0026] As preferred, the calculation method of the starting end temperature t 起始端The matching conveying medium is located in the heat supply pipe network pipe during flowing, and a resistance loss Δp = a heat medium pressure value p required by a user end is generated 用户端 A pipe conveying starting end heat medium pressure value p 起始端 A pipe conveying starting end heat medium enthalpy value h is obtained 起始端 And a pressure value p 起始端 A pipe conveying starting end heat medium temperature value t is obtained 起始端 .

[0027] The present application has at least the following beneficial effects:

[0028] 1. The test results are combined with the pipe network test model to more accurately estimate the heat loss of the pipe network or pipe line and the corresponding conveying medium temperature drop value, so that the heat source point or heat supply station outlet heat medium parameters are determined according to the heating hot water or heat supply steam heat medium parameters required by the heat user end, which is more scientific and reasonable than the heat loss estimation method recommended according to the current standard specification;

[0029] 2. The data for calculation is derived from the simulation of engineering meteorological environment conditions and conveying medium parameters, working conditions, and the pipe insulation heat preservation performance test using the engineering proposed insulation structure form and installation combination conditions, and the calculation results are close to the actual engineering effect, which has more guiding significance and reference value for engineering construction;

[0030] 3. The average temperature drop value of the conveying medium in the unit length heat pipe is used as a parameter index for measuring and evaluating the insulation performance and effect of the insulated pipe, which can include the influence of different conveying medium parameters and engineering meteorological environment conditions on the insulation performance of the insulated pipe in the comprehensive evaluation system, optimize and improve the existing insulated pipe heat preservation effect test and evaluation technology, and provide more intuitive and effective data support for further optimizing the pipe insulation structure design and improving the economy of the insulation project. Embodiment description

[0031] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the embodiments needed in the embodiment description will be briefly introduced below. Obviously, the embodiments in the following description are only some embodiments of the present application, and other embodiments can be obtained by those skilled in the art without creative labor on the basis of these embodiments. Specific implementation

[0032] With reference to the drawings, the specific embodiments of the present application will be described in detail below. It should be noted that the embodiments described are only a part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of the present application.

[0033] It should be noted that the terms "first", "second" and the like in the description and claims of the present application and the above-described embodiments are used to distinguish similar objects, and do not necessarily indicate a specific order or sequence. It should be understood that the data thus used can be interchanged under appropriate circumstances, so that the embodiments of the application described herein can be implemented in an order other than that described herein. In addition, the terms "comprise" and "have" and any variations thereof are intended to cover non-exclusive inclusion, for example, a process, method, system, product or server comprising a series of steps or units does not necessarily limit to those steps or units clearly listed, but can include other steps or units not clearly listed or inherent to these processes, methods, products or devices.

[0034] Embodiment one

[0035] The embodiment provides a heat pipe medium temperature drop calculation method based on heat dissipation simulation test results, and the method comprises the following steps:

[0036] S01, based on the design blueprint, the heat pipe network is created by matching the model library, and the heat preservation structure adapted to the straight pipe section and the local pipe fitting in the heat pipe network is automatically generated, so as to obtain the pipe network test model;

[0037] Specifically, the design blueprint described above is to determine the pipe network construction drawing of the development project, or to select the pipe type to create the pipe network on the system, and to determine the construction method of the heat preservation material based on the pipe in the drawing. Then, the virtual test device matched with it is generated synchronously to perform virtual testing, so as to build a complete pipe network test model.

[0038] The data acquisition of the virtual test device is obtained based on the collection and arrangement of the actual test device running test, and the details are as follows:

[0039] The data acquisition test device comprises an air conditioning system, a ventilation system and a spray water pipe arranged in a closed test space, which is used to simulate different environmental temperatures, environmental wind speeds and heat preservation pipe rain states in the space.

[0040] And the field through the valve opening, the water flow covering the surface of the test piece. Because the outdoor rain, rain temperature is generally close to the ambient temperature, so the test spray water temperature is generally also controlled in close to the ambient temperature, such as simulation of engineering environment temperature is 5 ℃, spray water temperature is also controlled in 5 ℃ or so, spray water temperature and the difference between the ambient temperature in the closed test space is not more than 2 ℃.

[0041] And the calculation formula of the thermal conductivity coefficient λi of each layer of thermal insulation material is:

[0042] ,

[0043] In the formula: λ i The thermal conductivity coefficient of the composite insulation i layer of thermal insulation material, the unit is W / (m·K);

[0044] q l The linear heat flux density of the thermal insulation pipe test piece, that is, the heat flow per unit length of the thermal insulation pipe test piece, the unit is W / m;

[0045] d i The inner diameter of the i layer of thermal insulation material, d i+1 The outer diameter of the i layer of thermal insulation material, which is also the inner diameter of the i+1 layer of thermal insulation material, both units are m;

[0046] t1 is the outer wall temperature of the steel pipe, that is, the inner side temperature of the first layer of thermal insulation layer from inside to outside, t2 is the outer side temperature of the first layer of thermal insulation layer from inside to outside, and so on, t i The inner side temperature of the i layer of thermal insulation material, t i+1 The outer side temperature of the i layer of thermal insulation material, which is also the inner side temperature of the i+1 layer of thermal insulation layer, both units are ℃.

[0047] In other words, it is through the pre-acquisition of compensation section, elbow section, drain section and fixed section and the heat gradient loss of pipeline in the process of fixed liquid temperature transmission, that is, from the outlet to the inlet. And the heat loss gradient change value under different thermal insulation materials. To obtain the heat loss change of the entire pipe network constructed.

[0048] S02, simulate the matching conveying medium located in the heat supply pipe network, and collect the outer surface temperature and heating power data of the thermal insulation structure in real time, and then calculate the linear heat flux density value ql 直管 And the linear heat flux density value ql 局部i Of the local pipe fitting, wherein the length L 局部i The length of the local pipe fitting is calibrated according to the center line expansion length;

[0049] Specifically, the local pipe fitting includes compensation section, elbow section, drain section and fixed section, and the linear heat flux density is calculated:

[0050] Straight pipe section through steady-state heat transfer formula ql 直管 = heating power - axial heat flow correction value / specimen length ql 直管

[0051] Local pipe fittings are corrected according to the geometric development length (such as the elbow section is developed into an arc length L = πR / 2 according to the bending radius R) to correct the heat dissipation area.

[0052] S03, according to the total length L of the straight pipe section in the heat supply pipe network 直管 , the single piece development length L of the local pipe fitting 局部i and the number n 局部i , the total heat dissipation flow value of the whole process under the rated operating condition and the most unfavorable operating condition is calculated:

[0053] Q = ql 直管 × L 直管 + ∑ql 局部i × L 局部i × n 局部 ;

[0054] The straight pipe section specimen linear heat flux density value ql 直管 and the local pipe fitting specimen linear heat flux density value ql 局部i such as compensation section, elbow section, drain section and fixed section, etc. are combined with the whole process design arrangement scheme of the heat pipe, and the formula is calculated. The total heat dissipation flow Q of the heat preservation heat pipe under the corresponding engineering meteorological environmental conditions can be calculated.

[0055] In the above formula: Q is the total heat dissipation flow value of the heat pipe, unit is W;

[0056] ql 直管 is the linear heat flux density value of the heat dissipation of the heat pipe straight pipe section, unit is W / m;

[0057] L 直管 is the total length value of the straight pipe section in the heat pipe, unit is m;

[0058] ql 局部i is the linear heat flux density value of a single i-type local pipe fitting, unit is W / m;

[0059] L 局部i is the center development length value of a single i-type local pipe fitting, unit is m / each;

[0060] n 局部i is the number of i-type local pipe fittings in the whole length of the pipe, unit is pieces;

[0061] Wherein the corresponding relationship between the local pipe fitting type and the classification number i is: the first type of local pipe fitting is compensation section, the second type of local pipe fitting is elbow section, the third type of local pipe fitting is drain section, and the fourth type of local pipe fitting is fixed section.

[0062] The heat dissipation flow rate Q of the entire pipeline under rated operating conditions was calculated using the method described above. nom The heat dissipation flow rate Q of the entire pipeline under the most unfavorable operating conditions max This is used as the enthalpy reduction of the medium inside the pipe from the starting point to the end point under the corresponding operating conditions, and is used in the calculation process of the following steps.

[0063] S04, Using Q as the enthalpy drop of the medium throughout the entire process. Based on user-end requirements parameters, and through the heat balance equation And calculate the initial temperature t based on the medium type. 起始端 and pressure value p 起始端 ;

[0064] Generally, the media transported in heat pipelines mainly include two types: heating steam and heating hot water. The calculation methods for the parameters at the starting point of pipeline transportation for these two media are basically the same, that is, the required temperature value t of the heat medium at the heat user end. 用户端 and pressure value p 用户端 Calculate the enthalpy h of the thermal medium at the user end. 用户端 The total heat dissipation flow rate Q along the entire pipeline is equal to the enthalpy decrease Δh of the medium from the starting point to the ending point. According to the principle of enthalpy balance of the thermal medium, the enthalpy hstarting point of the thermal medium at the starting end of the pipeline = the enthalpy huser point of the thermal medium required at the user end + the total enthalpy decrease Δh of the medium along the entire pipeline. Since Δh = Q, hstarting point = Q. 起始端 =h 用户端 +Q. The resistance loss generated by the thermal medium during its flow within the pipe is the total pressure drop of the medium. Therefore, the pressure value p of the thermal medium at the starting point of the pipeline transport can be determined. 起始端 =Required thermal medium pressure value p at the user end 用户端 +Calculated value of the flow resistance of the thermal medium Δp. This is based on the enthalpy h of the thermal medium at the starting point of the pipeline transport. 起始端 and pressure value p 起始端 Then, the temperature value t of the thermal medium at the starting end of the pipeline transportation can be further obtained. 起始端 Details are as follows:

[0065] Temperature t at the starting end of the heating steam supply 起始端 and pressure value p 起始端 This includes the following steps:

[0066] S41, User-side pressure p 用户端 Convert to absolute pressure p 用户端 =(p 用户端 +101325) / 10 5 ;

[0067] S42, User-side temperature t 用户端Convert to absolute temperature T 用户端 = t 用户端 + 273.15

[0068] S43, T 用户端 and P 用户端 are substituted into equation (1) to obtain the steam enthalpy value h 用户端 (unit: kJ / kg) required by the user end per unit mass of parameters;

[0069] ;

[0070] Equation (1) is fitted from the water and water vapor characteristic curve, and is applicable to steam with temperature in the range of 100-600℃ and pressure in the range of 0-200bar;

[0071] S44, the heat dissipation flow value Q nom of the whole pipeline under the rated working condition and the heat dissipation flow value Q max of the whole pipeline under the most unfavorable working condition are respectively substituted into equation h 起始端 = h 用户端 + Q to obtain the heating hot water enthalpy value h 起始端n and h 起始端m of the pipeline delivery starting end under the corresponding working condition, and then the heating hot water temperature values t 2 and t 起始端n of the pipeline delivery starting end under the rated working condition and the most unfavorable working condition are respectively calculated by using the equation h = 0.001 × t 起始端m + 4.074 × t.

[0072] S45, the whole flow resistance value Δp nom of the heating steam in the pipeline under the rated working condition and the whole flow resistance value Δp max of the heating steam in the pipeline under the most unfavorable working condition are calculated, and then substituted into p 起始端 = p 用户端 + Δp to obtain the heating steam pressure value p 起始端n and p 起始端m of the pipeline delivery starting end under the corresponding working condition, and then the starting end heating steam temperature values t 起始端n and t 起始端m under the rated working condition and the most unfavorable working condition are respectively calculated by using equation (1).

[0073] The temperature t 起始端 and pressure value p 起始端 of the heating hot water starting end include the following steps:

[0074] S46, the heating hot water Celsius temperature value t 用户端 (unit: kJ / kg) required by the user end is substituted into (2) to obtain the hot water enthalpy value h 用户端 of the user end per unit mass of parameters;

[0075] h = 0.001 x t2+ 4.074 x t (2);

[0076] The formula (2) is fitted by a water and water vapor characteristic curve, and the applicable water temperature range is 0-250℃.

[0077] S47, calculate the whole flow resistance value Δp of the heating hot water in the pipe under the rated working condition nom and the whole flow resistance value Δp of the heating hot water in the pipe under the most unfavorable working condition max , and respectively substitute into the formula p 起始端 = p 用户端 + Δp, to obtain the heating hot water pressure value p 起始端n at the starting end of the pipeline under the corresponding working condition 起始端m .

[0078] S05, calculate the average temperature drop value of the medium in the heat pipe per unit length , and generate a heat preservation effect comprehensive evaluation model with the heat loss heat flux density value of the outer surface temperature of the heat preservation structure;

[0079] The medium temperature attenuation (Δt) in the pipeline transportation process, the outer surface temperature of the heat preservation layer and the heat loss heat flux density are analyzed and correlated to form a multi-dimensional and dynamic heat preservation performance evaluation system. This breaks through the limitation of a single index, integrates thermodynamic parameters and engineering measured data through a mathematical model, can intuitively reflect the actual heat insulation efficiency of the heat preservation structure, and can reveal the key path of heat loss, provide a scientific basis for optimizing the selection of heat preservation materials, structure design and operation and maintenance strategies, and ultimately achieve the goal of reducing energy consumption and improving the economic efficiency and reliability of the heat distribution network.

[0080] S06, according to the starting end parameters of the rated working condition and the most unfavorable working condition, formulate the rated parameters, adjustment range and dynamic control plan of the medium at the heat source point outlet, set the process margin, and input the calculation results into the actual pipeline system for verification. If the end temperature deviation is ≥5%, recalibrate the local pipe heat dissipation coefficient or adjust the simulation parameters.

[0081] Specifically, the above-mentioned margin setting is based on engineering experience, and the rated working condition parameters allow ±5% fluctuation (such as ±2℃ of the starting end temperature), and the most unfavorable working condition allows ±10% fluctuation, to ensure the system robustness. Then, based on the calibrated local pipe heat dissipation coefficient or adjusted simulation parameters obtained, the actual construction heat pipe network is re-insulated and reinforced locally, so as to ensure that the heat loss in the actual operation process is minimized.

[0082] In summary, the scheme provided by the first embodiment combines the test result with the pipe network test model, more accurately estimates the heat loss of the pipe network or the pipeline and the corresponding temperature drop value of the conveying medium, and determines the heat source point or the outlet heat medium parameter of the heat supply station according to the required heating hot water or steam heat medium parameter of the heat user end, which is more scientific and reasonable than the heat loss estimation method recommended according to the current standard specification; secondly, the data for calculation is derived from the simulated engineering meteorological environment condition and the conveying medium parameter, working condition, and the pipe insulation heat preservation performance test using the engineering designed insulation structure form and installation combination condition, the calculation result is close to the actual engineering effect, and has more guiding significance and reference value for engineering construction; thirdly, the average temperature drop value of the conveying medium in the unit length heat pipe is used as the parameter index for measuring and evaluating the insulation performance and effect of the insulated pipe, the influence of different conveying medium parameters and engineering meteorological environment conditions on the insulation performance of the insulated pipe can be included in the comprehensive evaluation system, the existing insulation pipe heat preservation effect test and evaluation technology is optimized and improved, and more intuitive and effective data support is provided for further optimizing the pipe insulation structure design and improving the economy of the insulation engineering.

[0083] The second embodiment

[0084] The embodiment of the present application provides a non-transitory computer readable storage medium, at least one instruction or at least one program is stored in the non-transitory computer readable storage medium, the at least one instruction or the at least one program is loaded and executed by a processor to realize the steps of:

[0085] Based on the design blueprint, a heat supply pipe network is created by matching in the model library, and an insulation structure adapted to the straight pipe section and the local pipe fitting in the heat supply pipe network is automatically generated, so as to obtain a pipe network test model;

[0086] Setting regional meteorological test parameters applied to the pipe network test model, and in-pipe wall heating temperature, matching conveying medium and parameters in the heat supply pipe network;

[0087] Simulating the flow of the matching conveying medium in the heat supply pipe network, and collecting the outer surface temperature and heating power data of the insulation structure in real time, and then calculating the linear heat flow density value ql 直管 of the straight pipe section and the linear heat flow density value ql 局部i of the local pipe fitting, respectively;

[0088] According to the total length L 直管 of the straight pipe section, the single piece expansion length L 局部i and the number n 局部i of the local pipe fitting in the heat supply pipe network, the total heat loss flow value under the rated working condition and the most unfavorable working condition is calculated:

[0089] Q=ql 直管 ×L直管 +∑ql 局部i ×L 局部i ×n 局部 ;

[0090] Q as the medium full heat drop value , combined with user demand parameters, through the heat balance equation , and according to the type of medium to calculate the starting temperature t 起始端 And pressure value p 起始端 ;

[0091] The average temperature drop value of the medium in the heat pipe per unit length is calculated , and the heat preservation effect comprehensive evaluation model is generated by comparing the outer surface temperature of the heat preservation structure and the heat loss heat flow density value;

[0092] According to the starting parameters of the rated operating condition and the most unfavorable operating condition, the rated parameters, adjustment range and dynamic control plan of the heat source point outlet medium are formulated, and the process margin is set, and the calculation results are input into the actual pipeline system for verification. If the end temperature deviation is ≥5%, the local pipe heat dissipation coefficient is recalibrated or the simulation parameters are adjusted.

[0093] A person of ordinary skill in the art can understand that all or part of the processes in the above-mentioned embodiments can be completed by a computer program instructing related hardware. The computer program can be stored in a non-volatile computer readable storage medium. When the computer program is executed, it can include the processes of the above-mentioned embodiments. Any reference to memory, storage, database or other medium used in the embodiments provided by the present application can include non-volatile and / or volatile memory. Non-volatile memory can include read-only memory (ROM), programmable ROM (PROM), electrically programmable ROM (EPROM), electrically erasable programmable ROM (EEPROM) or flash memory. Volatile memory can include random access memory (RAM) or external cache memory. As an illustration but not limitation, RAM is available in various forms, such as static RAM (SRAM), dynamic RAM (DRAM), synchronous DRAM (SDRAM), double data rate SDRAM (DDR SDRAM), enhanced SDRAM (ESDRAM), synchronous link (Synchlink) DRAM (SLDRAM), memory bus (Rambus) direct RAM (RDRAM), direct memory bus dynamic RAM (DRDRAM), and memory bus dynamic RAM (RDRAM).

[0094] Those skilled in the art can clearly understand that, for the convenience and brevity of description, only the above-mentioned functional units and modules are exemplified, and in actual application, the above-mentioned functions can be completed by different functional units and modules according to needs, that is, the internal structure of the device is divided into different functional units or modules to complete all or part of the above-described functions.

[0095] Embodiment three

[0096] The embodiment of the application provides an electronic device, comprising a processor and a memory, wherein the memory stores at least one instruction or at least one program, and the at least one instruction or the at least one program is loaded and executed by the processor to realize the steps of:

[0097] Based on the design blueprint, a heat supply pipe network is created by matching in a model library, and a heat preservation structure adapted to the straight pipe section and the local pipe fitting in the heat supply pipe network is automatically generated according to the straight pipe section and the local pipe fitting in the heat supply pipe network, so as to obtain a pipe network test model;

[0098] Regional meteorological test parameters applied to the pipe network test model, and a pipe wall heating temperature, a matching conveying medium and parameters in the heat supply pipe network are set;

[0099] The matching conveying medium is simulated to flow in the heat supply pipe network, and the outer surface temperature and the heating power data of the heat preservation structure are collected in real time, and then the linear heat flow density value ql of the straight pipe section 直管 and the linear heat flow density value ql of the local pipe fitting 局部i are calculated respectively;

[0100] According to the total length L of the straight pipe section in the full length 直管 , the single piece unfolding length L of the local pipe fitting 局部i and the number n 局部i in the heat supply pipe network, the total heat dissipation flow value in the full length under the rated working condition and the most unfavorable working condition is calculated:

[0101] Q=ql 直管 ×L 直管 +∑ql 局部i ×L 局部i ×n 局部 ;

[0102] Taking Q as the medium full-length enthalpy reduction value , combining user end demand parameters, passing through a heat balance equation , and according to the medium type, the starting end temperature t 起始端 and the pressure value p 起始端 are calculated;

[0103] The average temperature drop value of the medium in the unit length heat pipe is calculated , and the average temperature drop value is compared with the heat dissipation loss heat flow density value of the outer surface temperature of the heat preservation structure to generate a heat preservation effect comprehensive evaluation model;

[0104] According to the initial parameters of the rated working condition and the most unfavorable working condition, the rated parameters, the adjustment range and the dynamic control plan of the heat source point outlet medium are formulated, the process margin is set, the calculation results are input into the actual pipeline system for verification, and if the end temperature deviation is greater than or equal to 5%, the local pipe heat dissipation coefficient is recalibrated or the simulation parameters are adjusted.

[0105] The above is only a preferred embodiment of the present application, and does not limit the present application in any form. Although the present application has been disclosed as above with a preferred embodiment, it is not intended to limit the present application. Any person skilled in the art can make some changes or modifications to the above disclosed technical content without departing from the scope of the technical solution of the present application, and any simple modification, equivalent change and modification of the above embodiments made according to the technical essence of the present application are still within the scope of the technical solution of the present application.

Claims

1. A method for calculating the temperature drop of a medium in a thermal pipeline based on heat dissipation simulation test results, characterized in that, Includes the following steps: S01. Based on the design blueprint, a heating network is created by matching the model library, and an insulation structure that is adapted to the straight pipe sections and local pipe fittings in the heating network is automatically generated to obtain a network test model. S02. Simulate the flow of the matching transport medium in the heating pipe network, and collect the outer surface temperature and heating power data of the insulation structure in real time, and then calculate the linear heat flux density value ql of the straight pipe section respectively. 直管 And the linear heat flux density value ql of local pipe fittings 局部i ; S03, based on the total length L of the straight pipe sections in the heating network. 直管 The unfolded length L of a single local pipe fitting 局部i and quantity n 局部i Calculate the total heat dissipation flow rate under rated operating conditions and the most unfavorable operating conditions: Q=ql 直管 ×L 直管 +∑ql 局部i ×L 局部i ×n 局部 ; S04, Using Q as the enthalpy drop of the medium throughout the entire process. Based on user-end requirements parameters, and through the heat balance equation And calculate the initial temperature t based on the medium type. 起始端 and pressure value p 起始端 ; S05. Calculate the average temperature drop of the medium per unit length of a thermal pipe. And generate a comprehensive evaluation model of the insulation effect by combining the outer surface temperature of the insulation structure and the heat flux density value of the heat loss; S06. A margin is set based on the calculated value of the medium parameter at the starting end under rated operating conditions as the outlet thermal medium parameter under rated operating conditions. Similarly, a necessary margin is set based on the starting end medium parameter under the most unfavorable operating conditions as the adjustment range and upper limit of the outlet medium parameter.

2. The method for calculating the temperature drop of a thermal pipeline medium based on heat dissipation simulation test results according to claim 1, characterized in that, The local pipe fittings include compensating joints, elbow joints, drainage joints, and fixing joints.

3. The method for calculating the temperature drop of a thermal pipeline medium based on heat dissipation simulation test results according to claim 1, characterized in that, The starting end temperature t 起始端 and pressure value p 起始端 The calculation method includes: the temperature t at the starting end of the heating steam. 起始端 and pressure value p 起始端 This includes the following steps: S41, User-side pressure p 用户端 Convert to absolute pressure p 用户端 =(p 用户端 +101325) / 10 5 ; S42, User-side temperature t 用户端 Convert to absolute temperature T 用户端 =t 用户端 +273.15; S43, T 用户端 and P 用户端 Substituting into equation (1), the steam enthalpy h of the parameters required per unit mass of the user end is obtained. 用户端 ; ； S44. The heat dissipation flow rate Q of the entire pipeline under rated operating conditions. nom The heat dissipation flow rate Q of the entire pipeline under the most unfavorable operating condition. max Substitute into the formula h respectively 起始端 =h 用户端 In +Q, calculate the enthalpy h of the heating hot water at the starting point of the pipeline transportation under the corresponding operating conditions. 起始端n and h 起始端m Then use h=0.001×t 2 +4.074×t to calculate the corresponding heating hot water temperature t at the pipeline delivery starting point under rated operating conditions and the most unfavorable operating conditions. 起始端n and t 起始端m ; S45. Calculate the total flow resistance Δp of the heating steam in the pipe under rated operating conditions. nom The total flow resistance value Δp of the heating steam in the pipe under the most unfavorable operating condition max And substitute p into each 起始端 =p 用户端 In +Δp, calculate the steam pressure p at the starting end of the pipeline under the corresponding operating condition. 起始端n and p 起始端m Then, use formula (1) to calculate the initial heating steam temperature t under rated operating conditions and most unfavorable operating conditions. 起始端n and t 起始端m .

4. The method for calculating the temperature drop of a thermal pipeline medium based on heat dissipation simulation test results according to claim 1, characterized in that, The starting end temperature t 起始端 and pressure value p 起始端 The calculation methods include: the temperature t at the starting end of the heating hot water supply. 起始端 and pressure value p 起始端 This includes the following steps: S46. The required hot water temperature value in Celsius for the user end t 用户端 Substitute into (2) to obtain the enthalpy value h of hot water required per unit mass of user terminal. 用户端 ; h=0.001×t2+4.074×t(2); S47. Calculate the total flow resistance Δp of the heating hot water in the pipe under rated operating conditions. nom The total flow resistance value Δp of the heating hot water in the pipe under the most unfavorable operating conditions max Substitute them into the formula p respectively 起始端 =p 用户端 In +Δp, calculate the heating hot water pressure value p at the starting end of the pipeline under the corresponding operating condition. 起始端n and p 起始端m .

5. The method for calculating the temperature drop of a thermal pipeline medium based on heat dissipation simulation test results according to claim 1, characterized in that, The starting end temperature t 起始端 This includes the resistance loss Δp generated during the flow of the matching transport medium within the heating pipeline network, which is equal to the required thermal medium pressure p at the user end. 用户端 -Pressure value p of the thermal medium at the starting point of pipeline transportation 起始端 Then, the enthalpy h of the thermal medium at the starting end of the pipeline transportation is obtained. 起始端 and pressure value p 起始端 The temperature t of the thermal medium at the starting end of the pipeline transportation is obtained. 起始端 .

6. A non-transitory computer-readable storage medium, wherein the non-transitory computer-readable storage medium stores at least one instruction or at least one program, characterized in that, The at least one instruction or the at least one program segment is loaded and executed by the processor to implement the steps of the thermal pipeline medium temperature drop calculation method based on heat dissipation simulation test results as described in any one of claims 1-5.

7. An electronic device, characterized in that, It includes a processor and a memory, wherein the memory stores at least one instruction or at least one program, and the at least one instruction or at least one program is loaded and executed by the processor to implement the steps of the thermal pipeline medium temperature drop calculation method based on heat dissipation simulation test results as described in any one of claims 1-5.

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