阅读说明：本技术 一种用于测定蒸汽管网热流密度的方法 (Method for measuring steam pipe network heat flux density ) 是由 陈天养 陈雷 吴晓菁 于 2021-08-23 设计创作，主要内容包括：本申请公开一种用于测定蒸汽管网热流密度的方法,涉及保温管道热流密度测定技术领域,其包括：S1、设置实验装置；S2、测量长度；S3、连电表；S4、启动实验装置；S5、调整所有电加热元件温度为设定值；S6、使用电表K1测量电加热元件消耗电能并记录；S7、持续加热至稳定状态；S8、每隔一小时记录一次各电子测温仪数显屏上显示的数值,记录电表K1显示电能,并记录稳定状态测量时间T；S9、计算主加热段所消耗的电能W,计算测量时间T,根据N=W/T,计算电加热元件所消耗功率；再根据Q=N*/L,计算出保温管的热流密度。本申请具有提升测定热力管网热流密度便利性、安全性及降低企业生产成本的效果。(The application discloses a method for determining steam pipe network heat flux density relates to heat preservation pipeline heat flux density determination technical field, and it includes: s1, setting an experimental device; s2, measuring the length; s3, connecting the ammeter; s4, starting an experimental device; s5, adjusting the temperature of all electric heating elements to be a set value; s6, measuring and recording the consumed electric energy of the electric heating element by using an electric meter K1; s7, continuously heating to a stable state; s8, recording the numerical value displayed on the digital display screen of each electronic temperature measuring instrument once every hour, recording the display electric energy of an electric meter K1, and recording the measurement time T in a stable state; s9, calculating the electric energy W consumed by the main heating section, calculating the measuring time T, and calculating the power consumed by the electric heating element according to N = W/T; and then according to Q = N and/L, calculating the heat flow density of the heat preservation pipe. The application has the advantages of improving and measuring heat of a heating power pipe networkThe convenience and the safety of the stream density and the effect of reducing the production cost of enterprises.)

1. A method for determining steam pipe network heat flow density, comprising: the method comprises the following steps:

s1, setting an experimental device: an electric heating element is arranged in the working pipe; two heat insulation partitions are arranged in the working pipe at intervals, and two ends of the working pipe are sealed to form a main heating section positioned in the middle of the working pipe and heating compensation sections positioned at two ends of the working pipe; temperature measuring points are respectively arranged on the outer side walls of the main heating section and the two heating compensation sections and the inner cavities of the main heating section and the two heating compensation sections, and temperature sensing probes of the electronic temperature measuring instrument are fixed at the corresponding temperature measuring points; a plurality of layers of heat-insulating layers are coaxially coated outside the working pipe, and an outer protecting pipe is sleeved outside the outermost heat-insulating layer;

s2, measuring the length L of the main heating section;

s3, electrically connecting the electric heating element of the main heating section with an electric meter K1;

s4, starting an experimental device;

s5, adjusting the temperature of all electric heating elements to be steam parameter temperature values to be simulated;

s6, measuring the electric energy consumed by the electric heating element of the main heating section by using an electric meter K1, and recording;

s7, heating for a certain time until the temperature value of the corresponding temperature measuring point of the main heating section and the temperature value of the corresponding temperature measuring point of the two heating compensation sections are close to the designed temperature value, and the values are stable; meanwhile, the hourly increase value of the ammeter K1 is equal;

s8, recording the numerical value displayed on the digital display screen of each electronic temperature measuring instrument once every hour, recording the electric energy consumed by the electric meter K1, and recording the stable state measuring time T;

s9, calculating the final stable state measurement time T, calculating the electric energy W consumed in the stable state measurement process of the main heating section, and calculating the power consumed by the electric heating element according to N = W/T; then according to Q = N ·and/L, calculating the heat flow density of the heat preservation pipe.

2. The method of claim 1, wherein the method comprises the steps of: in S1, the electric heating element is an electric heating plate, and the electric heating plate is tightly attached to the inner wall of the working tube.

3. The method of claim 1, wherein the method comprises the steps of: in S1, heat-insulating end seals are fixed to both ends of the working pipe, respectively, and the two heat-insulating end seals seal the corresponding pipe openings of the working pipe, respectively.

4. A method for determining steam grid heat flow density according to claim 3, wherein: the thickness of any heat preservation end seal is more than or equal to the total thickness of the plurality of heat preservation layers.

5. The method of claim 1, wherein the method comprises the steps of: s1 specifically includes:

s1.1, presetting temperature measuring points A on the outer surface of any heating compensation section, uniformly arranging a plurality of temperature measuring points A on the outer surface of the corresponding heating compensation section at intervals, and respectively fixing temperature sensing probes of a plurality of electronic thermometers at the corresponding temperature measuring points A;

s1.2, presetting temperature measuring points B in a cavity in the heating compensation section, uniformly distributing a plurality of temperature measuring points B in the cavity in the heating compensation section, and respectively fixing temperature sensing probes of a plurality of electronic thermometers at the corresponding temperature measuring points B;

s1.3, presetting temperature measuring points C on the outer surface of the main heating section, uniformly distributing a plurality of temperature measuring points C on the outer surface of the main heating section, and respectively fixing temperature sensing probes of a plurality of electronic thermometers at the corresponding temperature measuring points C;

s1.4, temperature measuring points D are arranged in the cavity in the main heating section, a plurality of temperature measuring points D are uniformly distributed in the cavity in the main heating section, and temperature sensing probes of a plurality of electronic thermometers are respectively fixed at the corresponding temperature measuring points D.

6. The method of claim 5, wherein the method comprises the steps of: in S1.1, the distance between any temperature measuring point A and the working pipe orifice is not less than 100 mm.

7. The method of claim 1, wherein the method comprises the steps of: in S1.3, the distance between any temperature measuring point C and the heat-insulating partition is not less than 100 mm.

8. The method of claim 1, wherein the method comprises the steps of: in S1, temperature measuring points E1-Ei are sequentially arranged between adjacent heat insulating layers, a temperature measuring point F is arranged on the outer side face of the outermost heat insulating layer, the temperature measuring points E1-Ei and the temperature measuring point F are arranged in the main heating section, temperature sensing probes of a plurality of electronic thermometers are respectively fixed at the temperature measuring points E1-Ei and the temperature measuring point F, and a plurality of temperature measuring points E1-Ei are uniformly distributed on the circumference between the corresponding heat insulating layers.

9. The method of claim 8, wherein the method comprises the steps of: a plurality of temperature measuring points E1-Ei are uniformly distributed on the circumference between the corresponding heat insulation layers, and a plurality of temperature measuring points F are uniformly distributed on the circumference of the outer surface of the outermost heat insulation layer.

10. The method of claim 1, wherein the method comprises the steps of: in S7, heating for a certain time until the values of the temperature measuring point A and the temperature measuring point C are close to the preset temperature value and are stable, the values of the temperature measuring point B and the temperature measuring point D are close to the preset temperature value and are stable, continuing to operate the device, and then recording the measured values.

Technical Field

The application relates to the technical field of heat-insulating pipeline heat flow density measurement, in particular to a method for measuring steam pipe network heat flow density.

Background

In the operation process of the heat distribution pipe network, the heat preservation effect of the corresponding heat distribution pipe network is usually evaluated by measuring the heat flux density in the heat distribution pipe network within a certain time.

In the related art, a thermal steam pipe network comprises a working pipe for conveying a high-temperature medium (steam or hot water), wherein an outer protective pipe is coaxially sleeved outside the working pipe and used for reducing the influence of external factors on the working pipe and prolonging the service life of the working pipe; meanwhile, in order to reduce heat loss in the high-temperature medium conveying process, a heat insulation material is filled between the working pipe and the outer protection pipe to form a heat insulation layer; when measuring the heat flux density of the thermal steam pipe network, the staff adjusts the temperature of the steam or hot water to make the heating temperature reach the set value, and then measures the heat energy passing through the unit area in unit time.

By adopting the technical scheme, because the temperature of steam or hot water is not well regulated, the difficulty of controlling the steam generating set parameters in a laboratory is higher, the danger coefficient is higher, special high-precision experimental equipment is required to be used, and the production cost of an enterprise is higher, so that the direct measurement of the steam heat in a heating power steam pipe network is inconvenient, and the part to be improved exists.

Disclosure of Invention

In order to promote convenience, the security to heat flow density survey in the heating power steam pipe network, reduce the manufacturing cost of enterprise, this application provides a method for determining steam pipe network heat flow density.

The application provides a method for determining steam pipe network heat flux density, adopts following technical scheme:

a method for determining steam pipe network heat flow density, comprising the steps of:

s1, setting an experimental device: an electric heating element is arranged in the working pipe; two heat insulation partitions are arranged in the working pipe at intervals, and two ends of the working pipe are sealed to form a main heating section positioned in the middle of the working pipe and heating compensation sections positioned at two ends of the working pipe; temperature measuring points are respectively arranged on the outer side walls of the main heating section and the two heating compensation sections and the inner cavities of the main heating section and the two heating compensation sections, and temperature sensing probes of the electronic temperature measuring instrument are fixed at the corresponding temperature measuring points; a plurality of layers of heat-insulating layers are coaxially coated outside the working pipe, and an outer protecting pipe is sleeved outside the outermost heat-insulating layer;

s2, measuring length: measuring the length L of the main heating section;

s3, electrically connecting the electric heating element of the main heating section with an electric meter K1;

s4, starting an experimental device;

s5, adjusting the temperature of all electric heating elements to be steam parameter temperature values to be simulated;

s6, measuring the electric energy consumed by the electric heating element of the main heating section by using an electric meter K1, and recording;

s7, heating for a certain time until the temperature value of the corresponding temperature measuring point of the main heating section and the temperature value of the corresponding temperature measuring point of the two heating compensation sections are close to the designed temperature value, and the values are stable; meanwhile, the hourly increase value of the ammeter K1 is equal;

s8, recording the numerical value displayed on the digital display screen of each electronic temperature measuring instrument once every hour, recording the electric energy consumed by the electric meter K1, and recording the stable state measuring time T;

s9, calculating the final stable state measurement time T, calculating the electric energy W consumed in the stable state measurement process of the main heating section, and calculating the power consumed by the electric heating element according to N = W/T; then according to Q = N ·and/L, calculating the heat flow density of the heat preservation pipe.

By adopting the technical scheme, two ends of the working pipe are sealed, the working pipe is divided into the main heating section positioned in the middle of the working pipe and the heating compensation sections positioned at two ends of the working pipe by using the heat insulation partition, steam is replaced by the electric heating element to provide required high temperature, so that the temperature state of the main heating section can be in the working state of an actual steam pipe network for a long time, the actual steam pipe network is simulated by the main heating section, an experimenter can measure the heat flow density of the actual steam pipe network in a laboratory, and the convenience of measuring the heat flow density of the actual steam pipe network is improved; meanwhile, the required high temperature is provided by replacing steam with an electric heating element, and the steam is replaced by an electric heating mode for supplying heat, so that the temperature for generating set parameters is conveniently controlled in a laboratory, and compared with the control of generating the steam with the set parameters, the method has stronger operability and more convenient and safer detection process; moreover, the whole device is simple in structure and is beneficial to reducing the production cost of enterprises.

Preferably, in S1, the electric heating element is an electric heating plate, and the electric heating plate is closely attached to the inner wall of the working tube.

By adopting the technical scheme, the electric heating sheet has good high temperature resistance, and is convenient for realizing high temperature required by experiments; meanwhile, the electric heating sheets are tightly attached to the inner wall of the working pipe, so that the uniform heating of the inner wall of the working pipe is facilitated, the cracking of the working pipe due to uneven heating is reduced, and the normal operation of an experiment is ensured.

Preferably, in S1, heat-insulating end seals are respectively fixed at two ends of the working pipe, and each heat-insulating end seal respectively seals a corresponding pipe orifice of the working pipe.

Through adopting above-mentioned technical scheme, the end seal that keeps warm has good heat preservation effect, uses the end seal that keeps warm to seal the both ends mouth of pipe of working pipe, helps reducing the heat in the heating compensation section and scatters and disappears from the both ends mouth of pipe, helps reducing the energy consumption.

Preferably, the thickness of any heat-insulating end seal is more than or equal to the total thickness of the plurality of heat-insulating layers.

By adopting the technical scheme, the thickness of the heat-insulation end seal is set to be more than or equal to the total thickness of the heat-insulation layers, so that the amount of the temperature in the working pipe which is dissipated from the heat-insulation end seal is equal to or less than the amount of the temperature in the working pipe which is dissipated from the heat-insulation layer, the consistency of the device and the actual working environment of the steam pipe network is favorably improved, and the accuracy of the heat flux density measured by using the device is effectively improved.

Preferably, S1 specifically includes:

s1.1, presetting temperature measuring points A on the outer surface of any heating compensation section, uniformly arranging a plurality of temperature measuring points A on the outer surface of the corresponding heating compensation section at intervals, and respectively fixing temperature sensing probes of a plurality of electronic thermometers at the corresponding temperature measuring points A;

s1.2, presetting temperature measuring points B in a cavity in the heating compensation section, uniformly distributing a plurality of temperature measuring points B in the cavity in the heating compensation section, and respectively fixing temperature sensing probes of a plurality of electronic thermometers at the corresponding temperature measuring points B;

s1.3, presetting temperature measuring points C on the outer surface of the main heating section, uniformly distributing a plurality of temperature measuring points C on the outer surface of the main heating section, and respectively fixing temperature sensing probes of a plurality of electronic thermometers at the corresponding temperature measuring points C;

s1.4, temperature measuring points D are arranged in the cavity in the main heating section, a plurality of temperature measuring points D are uniformly distributed in the cavity in the main heating section, and temperature sensing probes of a plurality of electronic thermometers are respectively fixed at the corresponding temperature measuring points D.

By adopting the technical scheme, the temperature measuring points A, the temperature measuring points B, the temperature measuring points C and the temperature measuring points D are uniformly distributed in the corresponding intervals of the working pipe, so that the number of samples is increased, the accuracy of corresponding measuring data in the experimental process is improved, and the accuracy of the experimental result is improved.

Preferably, in S1.1, any temperature measuring point A is not less than 100mm away from the working nozzle.

By adopting the technical scheme, as the heat self-insulation end seal of the heating compensation section close to the pipe orifice of the working pipe is excessively dissipated to the external environment, the temperature of the heating compensation section close to the pipe orifice of the working pipe is always lower than the temperature of the heating compensation section deviating from the pipe orifice of the working pipe in the length direction; the arrangement position of the temperature measuring point A is not less than 100mm away from the working pipe orifice, so that the temperature measuring point A is far away from the working pipe orifice, and the contrast between the temperature value measured at the temperature measuring point A and the temperature value in the actual steam pipe network is favorably ensured.

Preferably, in S1.3, the distance between any temperature measuring point C and the heat-insulating partition is not less than 100 mm.

By adopting the technical scheme, the heat of the main heating section close to the heat insulation partition is conducted to the heat insulation partition, so that the temperature of the main heating section close to the heat insulation partition is lower than the temperature of the middle part of the main heating section; the arrangement position of the temperature measuring point C is away from the heat-insulating partition by a certain length, so that the consistency between the temperature value measured at the temperature measuring point C and the temperature of the outer wall of the actual steam pipe network working pipe is improved, and the rigidness of the experimental process is guaranteed.

Preferably, in S1, temperature measuring points E1-Ei are sequentially arranged between adjacent heat insulating layers, a temperature measuring point F is arranged on the outer side face of the outermost heat insulating layer, the temperature measuring points E1-Ei and the temperature measuring point F are arranged in the main heating section, temperature sensing probes of a plurality of electronic thermometers are respectively fixed at the temperature measuring points E1-Ei and the temperature measuring point F, and a plurality of temperature measuring points E1-Ei are uniformly arranged on the circumference between the corresponding heat insulating layers.

Through adopting above-mentioned technical scheme, set up temperature measurement station E1-Ei and temperature measurement station F, measure the temperature value between the adjacent heat preservation, and the temperature value of outside heat preservation lateral surface, the experimenter can judge the heat preservation effect on each temperature layer according to the temperature difference between each temperature layer, and then the experimenter of being convenient for constantly makes the adjustment to the material, the structure of heat preservation, promotes the heat preservation effect of steam pipe network heat preservation.

Preferably, a plurality of temperature measuring points E1-Ei are uniformly distributed on the circumference between the corresponding heat insulation layers, and a plurality of temperature measuring points F are uniformly distributed on the circumference of the outer surface of the outermost heat insulation layer.

Through adopting above-mentioned technical scheme, establish a plurality ofly with temperature measurement station E1-Ei and temperature measurement station F equipartition, increase sample quantity, help promoting the accuracy to temperature value measurement between each adjacent temperature layer, and then promote the experimenter to the accuracy that each heat preservation effect judged.

Preferably, in S7, the heating is performed for a certain time until the values of the temperature measurement point a and the temperature measurement point C are close to the preset temperature value and the values are stable, and the values of the temperature measurement point B and the temperature measurement point D are close to the preset temperature value and the values are stable, then the operation of the apparatus is continued, and then the measured values are recorded.

By adopting the technical scheme, after the experimental device is started and heated for a period of time, when the temperature values measured by the temperature measuring point A and the temperature measuring point C are close to the preset temperature value, the numerical value is stable; the values of the temperature measuring point B and the temperature measuring point D are close to the preset temperature value, and when the values are stable, the temperature state of the main heating section is in a state consistent with the actual steam pipe network, the stable measuring state in the experimental process is easy to judge, and experimenters can conveniently perform experimental operation.

In summary, the present application includes at least one of the following beneficial technical effects:

1. the heat distribution network is simulated by virtue of the working pipe, the heat insulation partition and the heat insulation end seal, and the electric heating sheet is used for replacing steam to provide required heat, so that the temperature generating set parameters can be conveniently controlled by laboratory personnel, and the detection process is more convenient and safer; moreover, the experimental device has a simple structure, and the production cost of enterprises is effectively saved;

2. the temperature measuring points A, the temperature measuring points B, the temperature measuring points C, the temperature measuring points D and the temperature measuring points E1-Ei are all arranged in a plurality of numbers, a control group is established, the temperature in each section of the working pipe in the experiment process is ensured to be in a normal and stable state, and the accuracy of the measured heat flow density of the steam pipe network is further effectively ensured;

3. the heat-insulating end seal is utilized to seal the pipe orifice of the working pipe, the thickness of the heat-insulating end seal is not smaller than the total thickness of a plurality of layers of heat-insulating layers, the consistency of the device and the actual working environment of the steam pipe network is favorably improved, and the accuracy of the heat flow density measured by the device is further improved.

Drawings

FIG. 1 is a cross-sectional view of the overall structure of the experimental device for measuring the heat flux density of the steam pipe network according to the embodiment of the present application.

Fig. 2 is a flow chart mainly showing the method for determining the heat flow density of the steam pipe network according to the embodiment of the present application.

Reference numerals: 1. a working pipe; 11. a primary heating section; 12. a heating compensation section; 2. an electrical heating sheet; 3. insulating and separating; 4. a heat-insulating layer; 5. an outer protecting pipe; 6. and (6) insulating end sealing.

Detailed Description

The present application is described in further detail below with reference to figures 1-2.

The present application discloses a method for determining a heat flow density of a steam pipe network, but the embodiments of the present invention are not limited thereto.

Referring to fig. 1 and 2, a method for determining a heat flow density of a steam pipe network includes the steps of:

s1, setting an experimental device: an electric heating sheet is arranged in the working pipe; two heat insulation partitions are arranged in the working pipe at intervals, and two ends of the working pipe are sealed to form a main heating section positioned in the middle of the working pipe and heating compensation sections positioned at two ends of the working pipe; temperature measuring points are respectively arranged on the outer side walls of the main heating section and the two heating compensation sections and the inner cavities of the main heating section and the two heating compensation sections, and a temperature sensing probe of the electronic thermometer is fixed at the corresponding temperature measuring point; and then a plurality of layers of heat-insulating layers are coaxially coated outside the working pipe, and an outer protective pipe is sleeved outside the outermost layer of heat-insulating layer.

S1.1: fixing heat-insulating end seals at two ends of the working pipe respectively to enable the two heat-insulating end seals to seal corresponding pipe orifices of the working pipe respectively;

s1.11: setting the thickness of any heat preservation end seal to be more than or equal to the total thickness of the heat preservation layers;

s1.2: at least four temperature measuring points A are distributed on the outer surface of any heating compensation section;

s1.21: setting the distance between any temperature measuring point A and the working pipe orifice to be not less than 100 mm;

s1.3: at least four temperature measuring points B are uniformly distributed in the cavity in the heating compensation section at intervals;

s1.4: at least four temperature measuring points C are uniformly distributed on the outer surface of the main heating section at intervals;

s1.41: the distance between any temperature measuring point C and the heat-preservation partition is not less than 100 mm;

s1.5: at least four temperature measuring points D are uniformly distributed in the cavity in the main heating section at intervals;

s1.5: temperature measuring points E1-Ei are sequentially arranged between adjacent heat preservation layers, the temperature measuring points E1-E3 are all arranged in the main heating section, and at least four temperature measuring points E1-Ei are uniformly distributed on the circumference between the corresponding heat preservation layers;

s1.6: at least four temperature measuring points F are uniformly distributed on the outer side surface of the heat preservation layer at intervals;

s2, measuring length: measuring the length L of the main heating section;

s3, electrically connecting the electric heating element of the main heating section with an electric meter K1;

s4, starting an experimental device;

s5, adjusting the temperature of all electric heating elements to be steam parameter temperature values to be simulated;

s6, measuring the electric energy consumed by the electric heating element of the main heating section by using an electric meter K1, and recording;

s7, heating for a certain time until the values of the temperature measuring point A and the temperature measuring point C are close to the design temperature value, and the values of the temperature measuring point B and the temperature measuring point D are close to the design temperature value and are stable; meanwhile, after the hourly increasing values of the electric meter K1 are equal, the device is continuously operated;

s8, recording the numerical value displayed on the digital display screen of each electronic temperature measuring instrument once every hour, recording the electric energy consumed by the electric meter K1, and recording the stable state measuring time T;

s9, calculating the final stable state measurement time T, calculating the electric energy W consumed in the stable state measurement process of the main heating section, and calculating the power consumed by the electric heating element according to N = W/T; then according to Q = N ·and/L, calculating the heat flow density of the heat preservation pipe.

The above embodiments are preferred embodiments of the present application, and the protection scope of the present application is not limited by the above embodiments, so: all equivalent changes made according to the structure, shape and principle of the present application shall be covered by the protection scope of the present application.