KR101520759B1 - System and method for measuring temperature distribution of boiler tube - Google Patents
System and method for measuring temperature distribution of boiler tube Download PDFInfo
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- KR101520759B1 KR101520759B1 KR1020130115249A KR20130115249A KR101520759B1 KR 101520759 B1 KR101520759 B1 KR 101520759B1 KR 1020130115249 A KR1020130115249 A KR 1020130115249A KR 20130115249 A KR20130115249 A KR 20130115249A KR 101520759 B1 KR101520759 B1 KR 101520759B1
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Abstract
A system and method for measuring the temperature distribution of a boiler tube in accordance with an embodiment of the present invention, the method for measuring the temperature distribution of the boiler tube comprises the steps of: Measuring the steam flow rate in real time; dividing the entire section of the heating section tube into a plurality of sections; and determining, based on the steam temperature, the steam pressure, and the steam flow rate of the tube inside the heating section tube, And sequentially calculating the inner temperature of the star tube and the outer surface temperature of the tube.
Description
The present invention relates to a system and a method for measuring the temperature distribution of a heating section tube without providing a temperature sensor in the heating section tube in the boiler,
It is derived from the research conducted as part of the original technology development project of the electric power industry by Korea Energy Technology Evaluation & [Project number: R10GG02, Project name: Integrated operation support and surveillance system development of supercritical high pressure thermal power plant]
Damage to the tube during operation of an industrial boiler is mainly due to creep damage due to high temperature operation for a long period of time and to thinning of the tube thickness due to erosion and corrosion. In order to evaluate the creep damage, it is necessary to know the pressure, temperature and operation time of the tube during operation.
That is, temperature information of the heating tube is indispensably required for monitoring the damage of the boiler tube. However, when the temperature sensor is installed on the outer surface of the tube in the furnace heating tube maintained at a high temperature during the operation of the boiler, the sensor malfunctions due to continuous high temperature heating due to the combustion gas and generation of thermal stress / thermal fatigue due to start / And there is a risk of deterioration of the structural integrity such as a decrease in the reliability of the measured value or a dropout from the installation point. In addition, the above-described risks are also present in a transmitter or a transmission line for transmission of a measurement signal.
In addition, the temperature sensor for measuring the steam temperature inside the tube is not often installed in the boiler of the old power plant. Especially, in the case of the batch recovery boiler of the combined power plant, there is no temperature sensor for measuring the steam temperature in the tube .
Therefore, there is a need for a system and a method that can measure the temperature distribution of the heating section tube without installing a temperature sensor in the heating section tube in the boiler.
There is a need in the art for a system and a method that can measure the temperature distribution of the heating section tube without installing a temperature sensor on the heating section tube in the boiler.
In order to solve the above problems, a first aspect of the present invention provides a method for measuring the temperature distribution of a boiler tube. The method for measuring the temperature distribution of the boiler tube includes the steps of measuring in real time the temperature of the tube inner steam at the inlet of the heating tube, the pressure of the steam, and the steam flow rate, and dividing the entire section of the heating tube into a plurality of sections And sequentially calculating the tube inner temperature and the tube outer surface temperature of each section based on the tube inner steam temperature, the steam pressure, and the steam flow amount at the inlet side of the heating part tube.
A second aspect of the present invention provides a system for measuring the temperature distribution of a boiler tube. The system for measuring the temperature distribution of the boiler tube includes a measuring device for measuring in real time the temperature of the tube inner steam at the inlet of the heating tube, the steam pressure and the steam flow rate, And a calculating device for sequentially calculating the tube inner temperature and the tube outer surface temperature for each section based on the tube inner steam temperature, the steam pressure, and the steam flow amount on the inlet side of the heating part tube.
In addition, the solution of the above-mentioned problems does not list all the features of the present invention. The various features of the present invention and the advantages and effects thereof will be more fully understood by reference to the following specific embodiments.
There is an advantage that the temperature distribution of the heating part tube can be accurately measured in real time without installing a temperature sensor on the heating part tube in the boiler.
1 is a view showing a configuration of a boiler tube temperature distribution measuring system according to an embodiment of the present invention,
FIG. 2 is a view showing the configuration of a detachable portable measurement device in a boiler tube temperature distribution measurement system according to an embodiment of the present invention; FIG.
3 is a flow chart illustrating a method for measuring the temperature distribution of a boiler tube in a boiler tube temperature distribution measurement system according to an embodiment of the present invention; and
4 is a flow chart specifically illustrating a method for calculating a tube inner temperature and a tube outer surface temperature for each section in a boiler tube temperature distribution measurement system according to an embodiment of the present invention.
Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings. However, the embodiments of the present invention can be modified into various other forms, and the scope of the present invention is not limited to the embodiments described below. Further, the embodiments of the present invention are provided to more fully explain the present invention to those skilled in the art. The shape and size of elements in the drawings may be exaggerated for clarity.
Hereinafter, a system and a method capable of measuring the temperature distribution of the heating section tube without providing a temperature sensor in the heating section tube in the boiler, which is an embodiment of the present invention, will be described.
1 is a view showing a configuration of a boiler tube temperature distribution measuring system according to an embodiment of the present invention.
Referring to FIG. 1, the boiler tube temperature distribution measuring system includes measuring devices 120-1 and 120-2, a calculating
First, the measuring devices 120-1 and 120-2 measure the temperature of the inner tube of the tube at the inlet side and the outlet side of the heating tube through the sensor installed in the
If the
As shown in FIG. 2, the portable measurement device includes a
The
Here, the calculation method of the tube inner temperature and the tube outer surface temperature for each section will be described in detail. The
The
3 is a flow chart illustrating a method for measuring the temperature distribution of a boiler tube in a boiler tube temperature distribution measurement system according to an embodiment of the present invention.
Referring to FIG. 3, the boiler tube temperature distribution measuring system measures the steam temperature, the steam pressure, and the steam flow rate of the tube inside the tube of the heating part tube (i.e., the non-heating part tube)
Here, the tube inner steam temperature at the inlet side of the heating section tube is measured by measuring the temperature of the tube outer surface at the inlet side of the heating section tube and the heat flux at the tube outer surface, Can be measured based on the heat conduction coefficient of < EMI ID = 1.0 >
Here, T in represents a tube inside the steam temperature of the inlet of the heating element tube, T out denotes the tube outer surface temperature of the inlet of the heating element tube, q is a heating element indicates a tube outer surface heat flux of the tube inlet, t is the tube And k is the coefficient of thermal conductivity of the tube. The temperature of the tube outer surface at the inlet side of the heating part tube and the heat flux of the tube outer surface can be measured by providing a separate portable measurement device constructed as shown in FIG. 2 on the outer surface of the tube.
Then, in
The boiler tube temperature distribution measuring system sequentially calculates the tube inner temperature and the tube outer surface temperature of each section based on the tube inner steam temperature, the steam pressure, and the steam flow amount at the inlet of the heating tube at
Thereafter, the boiler tube temperature distribution measurement system ends the algorithm according to the present invention.
FIG. 4 is a flowchart illustrating a specific method for calculating a tube inner temperature and a tube outer surface temperature for each section in a boiler tube temperature distribution measuring system according to an embodiment of the present invention.
Referring to FIG. 4, in
Then, in
Here,? P represents the pressure drop of the corresponding section, f represents the tube friction coefficient, dl represents the section length, d represents the tube diameter,
Then, the boiler tube temperature distribution measuring system calculates the lower pressure of the corresponding section based on Equation (3), based on the upper pressure and the pressure drop of each section in
Here, P lower represents the lower pressure of the corresponding section, P upper represents the upper pressure of the corresponding section, and ΔP represents the pressure drop of the corresponding section.
Then, in
Then, the boiler tube temperature distribution measuring system calculates the temperature increase amount of the relevant section based on the static specific heat and density of each section in
D represents the tube length, dl represents the length of the section, C p represents the specific heat of static pressure in the section, ,
Then, the boiler tube temperature distribution measuring system calculates the lower temperature of the corresponding section, as shown in Equation (5), based on the upper temperature and the temperature increase amount of each section in
Here, T lower represents the lower temperature of the corresponding section, T upper represents the upper temperature of the corresponding section, and ΔT represents the temperature increase amount of the corresponding section.
Then, in
Then, the boiler tube temperature distribution measuring system calculates the number of nucels of the steam in the corresponding section, as shown in Equation (6), based on the number of francs and the Reynolds number of the steam in each section in
Here, Nu represents the number of nucels of steam in the corresponding section, Re represents the Reynolds number of the steam in the corresponding section, Pr represents the franc number of the steam in the corresponding section, and f represents the tube friction coefficient.
Then, the boiler tube temperature distribution measuring system calculates the heat transfer coefficient of the steam in the corresponding section, as shown in Equation (7), based on the number of nucels of the steam in each section and the thermal conductivity coefficient of the steam in
Where h is the heat transfer coefficient of the steam, k stream is the heat transfer coefficient of the steam, Nu is the number of nucels of steam in the section and d is the tube diameter.
Then, the boiler tube temperature distribution measuring system calculates the internal temperature of the corresponding section of the boiler tube based on Equation (8), based on the upper and lower temperatures of the respective sections and the heat transfer coefficient of the steam in
Here, T tubei represents the internal temperature of the tube in the corresponding section, T upper represents the upper temperature of the corresponding section, T lower represents the lower temperature of the corresponding section, q represents the tube external heat flux at the inlet side of the heating tube, h represents the heat transfer coefficient of the vapor.
Then, the boiler tube temperature distribution measuring system calculates the tube outer surface temperature of the relevant section based on the inner tube temperature and the thermal conductivity coefficient of the tube in each section in
Here, T tubeo denotes a tube outer surface temperature of the section, T tubei denotes a tube inner temperature of the region, q is the heating element indicates a tube outer surface heat flux of the tube inlet, d indicates a tube diameter, t is the tube Dl represents the section length, and k tube represents the thermal conductivity coefficient of the tube.
Thereafter, the boiler tube temperature distribution measurement system ends the algorithm according to the present invention.
As described above, the system and method for measuring the temperature distribution of the boiler tube according to the embodiment of the present invention are characterized by virtually dividing the entire section of the heating section tube into a plurality of sections, (I.e., the lower pressure and the lower temperature, the tube inner temperature, and the tube outer surface temperature) are calculated by using the tube inner steam temperature, the steam pressure, and the steam flow rate at the inlet side (i.e., non-heating tube) The temperature distribution of the heating section tube can be accurately measured in real time without providing the temperature sensor in the heating section tube in the boiler by using the calculation result in the required data calculation of the next section, There is an advantage that the structural correctness that can occur and the reliability of the measured value can be solved.
While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, but, on the contrary, It will be obvious to those of ordinary skill in the art.
100: tube
120-1, 120-2: Measuring device
130: calculating device
140: Storage device
Claims (8)
Dividing the entire section of the heating section tube into a plurality of sections;
Sequentially calculating a tube inner temperature and a tube outer surface temperature for each section based on a tube inner steam temperature, a steam pressure, and a steam flow rate at an inlet side of the heating section tube,
The tube internal temperature and tube external surface temperature calculation process for each section are performed as follows.
The lower temperature and the lower pressure of the corresponding section on the basis of the upper temperature and the upper pressure of the section and the steam flow rate of the tube inside the inlet of the heating section tube sequentially from the first section to the last section for each section of the heating section tube, Calculating a tube inner temperature and a tube outer surface temperature,
In the case of the first section, the temperature and the steam pressure inside the tube at the inlet side of the heating section tube become the upper temperature and the upper pressure of the corresponding section. In the remaining section, the lower temperature and the lower pressure of the immediately preceding section become Wherein the upper temperature and the upper pressure of the boiler tube are the upper temperature and the upper pressure of the boiler tube.
Determining the density of the corresponding section based on the upper temperature and the upper pressure of each section sequentially from the first section to the last section;
Calculating a pressure drop of the corresponding section based on the density of each section and the steam flow rate of the tube inside the heating section tube;
Calculating a lower pressure of the corresponding section based on the upper pressure and the pressure drop of each section,
Determining a static specific heat of the corresponding section based on the upper temperature and the upper pressure of each section,
Calculating a temperature increase amount of the corresponding section based on the static specific heat and density of each section and the steam flow rate of the tube inside the heating section tube;
Calculating a lower temperature of the corresponding section based on the upper temperature and the temperature increase amount of each section,
Determining a Prantl number and a Reynold number of the steam of the corresponding section based on the upper temperature and the upper pressure of each section,
Calculating a Nusselt number of the steam of the corresponding section based on the franc number and the Reynold number of the steam in each section,
Calculating the heat transfer coefficient of the steam of the corresponding section based on the number of nucels of the steam in each section and the thermal conductivity coefficient of the steam,
Calculating a tube internal temperature of the corresponding section based on an upper temperature and a lower temperature of each section and a heat transfer coefficient of the steam,
And calculating a tube outer surface temperature of the corresponding section based on the inner tube temperature and the thermal conductivity coefficient of the tube in each section.
Wherein the number of the sections is determined based on a value obtained by dividing a vapor temperature difference between an inlet side and an outlet side of the heating tube by a resolution of the temperature sensor.
The entire section of the heating section tube is virtually divided into a plurality of sections and the temperature inside the tube and the temperature of the tube outer surface are sequentially calculated based on the tube inner steam temperature, the steam pressure, and the steam flow rate at the inlet side of the heating section tube And a computing device
The calculation device comprising:
The lower temperature and the lower pressure of the corresponding section on the basis of the upper temperature and the upper pressure of the section and the steam flow rate of the tube inside the inlet of the heating section tube sequentially from the first section to the last section for each section of the heating section tube, Calculates the inside temperature of the tube and the outside temperature of the tube,
In the case of the first section, the temperature and the steam pressure inside the tube at the inlet side of the heating section tube become the upper temperature and the upper pressure of the corresponding section. In the remaining section, the lower temperature and the lower pressure of the immediately preceding section become And the upper temperature and the upper pressure of the boiler tube.
The density of the corresponding section is determined based on the upper temperature and the upper pressure of each section sequentially from the first section to the last section,
The pressure drop amount of the corresponding section is calculated based on the density of each section and the steam flow rate inside the tube at the inlet side of the heating section tube,
The lower pressure of the corresponding section is calculated based on the upper pressure and the pressure drop of each section,
The specific heat of static pressure of the corresponding section is determined based on the upper temperature and the upper pressure of each section,
The temperature increase amount of the corresponding section is calculated based on the static specific heat and density of each section and the steam flow rate of the tube inside the heating section tube,
The lower temperature of the corresponding section is calculated based on the upper temperature and the temperature increase of each section,
The Prantl number and the Reynold number of the steam in the corresponding section are determined based on the upper temperature and the upper pressure of each section,
The Nusselt number of the steam in the corresponding section is calculated based on the franc number and the Reynold number of the steam in each section,
The heat transfer coefficient of the steam in the corresponding section is calculated based on the number of nucels of the steam in each section and the heat conduction coefficient of the steam,
Based on the top and bottom temperature of each section and the heat transfer coefficient of the steam,
Wherein the temperature of the outer surface of the tube in the corresponding section is calculated based on the temperature inside the tube and the coefficient of thermal conductivity of the tube in each section.
Wherein the number of the sections is determined on the basis of a value obtained by dividing a vapor temperature difference between an inlet side and an outlet side of the heating tube by a resolution of the temperature sensor.
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| KR1020130115249A KR101520759B1 (en) | 2013-09-27 | 2013-09-27 | System and method for measuring temperature distribution of boiler tube |
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| KR101520759B1 true KR101520759B1 (en) | 2015-05-19 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR102079565B1 (en) * | 2018-11-12 | 2020-02-20 | 한국전력공사 | Turbine inlet temperature measurement system and measurement method |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20020031906A (en) * | 2000-10-24 | 2002-05-03 | 김봉구 | Thermal mass flow meter |
| KR100639785B1 (en) * | 2005-09-15 | 2006-10-31 | 주식회사 아이스기술 | Method for measuring temperature on the boiler |
| US7909506B2 (en) * | 2005-10-19 | 2011-03-22 | Siemens Aktiengesellschaft | Virtual temperature measuring point |
| KR101104481B1 (en) * | 2009-06-30 | 2012-01-12 | 한국전력공사 | Calcuation system of temperature for power boiler and method thereof |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20020031906A (en) * | 2000-10-24 | 2002-05-03 | 김봉구 | Thermal mass flow meter |
| KR100639785B1 (en) * | 2005-09-15 | 2006-10-31 | 주식회사 아이스기술 | Method for measuring temperature on the boiler |
| US7909506B2 (en) * | 2005-10-19 | 2011-03-22 | Siemens Aktiengesellschaft | Virtual temperature measuring point |
| KR101104481B1 (en) * | 2009-06-30 | 2012-01-12 | 한국전력공사 | Calcuation system of temperature for power boiler and method thereof |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR102079565B1 (en) * | 2018-11-12 | 2020-02-20 | 한국전력공사 | Turbine inlet temperature measurement system and measurement method |
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