KR20110001790A - Calcuation system of temperature for power boiler and method thereof - Google Patents

Abstract

PURPOSE: Inner-temperature computing system and method of a boiler are provided to enable the steam temperatures of heating surfaces with no measuring instruments and of an immeasurable high-temperature boiler to be calculated. CONSTITUTION: An inner-temperature computing system of a boiler comprises a measuring instrument(10), a database(20), a computing module(30), a comparing unit(40) and a monitoring unit(50). The measuring instrument measures the gas inlet temperature, steam inlet temperature, gas rate and steam rate of the heating surface of a boiler. The database stores the data from the measuring instrument and the computed temperature from the computing module. The computing module compares absorbed amount of heat with transferred amount of heat to obtain a gas outlet temperature. The comparing unit compares the computed value with the measured value on the Eco heating surface of the outlet of the boiler to make the computing module compute again. The monitoring unit displays the computed temperature from the computing module.

Description

Calculation system of temperature for power boiler and method

The present invention relates to a system and method for calculating the internal temperature of a boiler, and more specifically, to obtain the actual internal temperature of the boiler, in order to obtain the actual internal temperature of the boiler, the measured flow rate and temperature value of the steam at the first heat transfer surface of the boiler, By calculating the temperature of the combustion gas and the steam temperature, we can calculate the temperature of the steam inside the high temperature boiler that cannot be measured and the heat of many heating surfaces without measuring instrument. Calculate the internal temperature of the boiler, which can improve accuracy by comparing the calculated steam temperature and measured steam temperature and the calculated gas temperature and measured gas temperature so that the calculation is performed to minimize the error. System and method.

As the domestic and overseas power industry environment has changed significantly, competition has been introduced into the power generation market, and economic efficiency and efficiency are emphasized in terms of power plant operation.

The boiler used as one of the power generation facilities is heat-transferred by low-temperature steam (or water) flowing in the heat transfer surface by the heat of high-temperature gas from the combustion of fuel, the gas is cooled and the steam is heated to It is a steam producing device that produces hot steam. If the boiler can obtain the maximum steam with the least fuel consumption, it can be said that the efficiency of the boiler, that is, the boiler performance is good.

The efficiency of the boiler appears as a result of heat transfer. If heat transfer from gas to steam goes well, the efficiency goes up. On the contrary, if the hot gas goes out of the boiler as it is, the efficiency goes down. Therefore, the heat transfer in the boiler, that is, the temperature state, has a significant meaning.

Accordingly, the temperature control is performed by installing a measuring instrument in the main part of the power generation facilities that greatly affect the operation performance of the boiler.

However, even if it is an essential temperature control part that has an important effect on the boiler's operating performance, when the installation of the instrument is impossible due to the high temperature, the operator does not receive the temperature information of the part and operates in blind operation to maintain the optimum temperature. There is a problem that can not be. For example, it is not possible to maintain the optimum temperature because the instrument is not installed in the 1200 ℃ hot combustion gas region, such as the furnace outlet.

As such, it is difficult to install an instrument in a high temperature combustion gas area such as a furnace exit, so it is in a level that indirectly infers and manages the operation temperature of the furnace exit using other parts of operation data. There is a problem that accurate management is not achieved by subjectively evaluating the value. In addition, since the procedure for calculating the furnace outlet gas temperature has not been established, it is difficult to maintain the optimum boiler operation state because the rapid temperature calculation corresponding to the operating condition that changes frequently is not performed.

In order to solve this problem, after setting the temperature of the furnace outlet to an arbitrary default value, it is used to calculate the low temperature combustion gas temperature exiting the last tube group of the boiler by using this formula and then measured the actual low temperature combustion gas If the calculated value and the actual measured value do not coincide with the temperature, the above process is repeated while changing the default value of the furnace outlet temperature. The technique for confirming the set temperature of the furnace exit as the actual temperature is described in "Boiler Furnace Outlet Combustion Gas Temperature Calculation System and Method" of Korean Patent Publication No. 10-0694430 (March 12, 2007). It has been disclosed by the applicant.

In addition, the technology to maintain the furnace operation status optimally by objectively and quantitatively obtaining the furnace outlet gas temperature according to the change of operating conditions by monitoring the furnace outlet gas temperature, which is the starting point of the boiler performance and the main operation indicator, in real time. A method and system for calculating a gas temperature of a boiler hot portion using a reverse calculation technique is disclosed in the registration number 10-0725177 (Jun. 04, 2007).

However, due to the high temperature of the gas and the economical reason for the steam, it is not easy to install the measuring instruments before and after a large number of heat transfer surfaces.

In addition, it is compared with the measured value installed in order to verify the result of the temperature calculation inside the boiler. In other words, the gas temperature calculated value and gas temperature measured value at the specific location (mainly Eco heating surface of the boiler outlet) were compared and verified.However, the measured value is not accurate due to the nature of the gas. There is an unreasonable problem.

An object of the present invention is to solve the conventional problems as described above, with the measured flow rate and temperature value of the steam in the first heat transfer surface in the boiler in order to obtain the actual internal temperature value of the boiler combustion before and after the heat transfer surface Provides a system and method for calculating the internal temperature of a boiler for calculating the temperature of the steam inside a high-temperature boiler that cannot be measured and a number of heating surfaces without a measuring instrument by presenting a method of calculating the temperature of a gas and a steam. It is.

Another object of the present invention is to calculate the minimum error by comparing both the calculated steam temperature and the measured steam temperature, and the calculated gas temperature and the measured gas temperature using both the gas temperature and the steam temperature measurement value as a reference It is to provide a system and method for calculating the internal temperature of the boiler that can be performed to increase the accuracy.

As a means for achieving the above object, the configuration of the system of the present invention is to measure the heat transfer surface gas inlet temperature (T1), steam inlet temperature (t1), gas flow rate (Wg), steam flow rate (Ws) of the boiler. A metering unit, a storage database for storing data input from the metering unit and a temperature calculation result performed by the calculation module, and four ports at which the hot gas and the low temperature steam exchange heat in the boiler heat transfer surface, that is, the inlet The gas inlet temperature (T1) and the steam inlet temperature (t1) values for obtaining the gas inlet temperature (T1), gas outlet temperature (T2), steam inlet temperature (t1), steam outlet temperature (t2) In order to calculate the gas outlet temperature (T2) and steam outlet temperature (t2), the calculation module calculates the gas outlet temperature (T2) and compares the steam outlet temperature (t2) by comparing the absorption heat and the heat transfer heat, and the boiler outlet Eco Compare calculated and measured values on the open side W is out of tolerance comprises the comparison unit for the re-calculation to the calculation module, a monitor for displaying the temperature calculation performed by the calculation module parts.

As a means for achieving the above object, the configuration of the method of the present invention comprises the steps of obtaining a gas discharge temperature Q = Wg * Cpg * (T1-T2), optionally assuming the gas outlet temperature T2, and steam absorption. Obtaining the steam outlet temperature t2 from the calorific formula (Q = Ws * Cps * (t2-t1)) and the heat transfer equation {Q = U * A * [(T1-t2)-(T2-t2)] / Obtaining absorbed heat quantity Q by using ln [(T1-t1) / (T2-t2)]}, and determining whether the absorbed heat amount due to the calculated heat transfer is within an error, and the amount of heat emitted from the gas is determined by the heat transfer. After the step of determining whether it is equal to the absorbed heat and the calculation of the first heat transfer surface is completed, the same process as described above is performed for the next heat transfer tube group, so that the steam inlet temperature and the steam outlet temperature of the eco-heat transfer surface, the last heat transfer surface of the boiler, are performed. To obtain the gas inlet temperature and gas outlet temperature, and the steam inlet temperature and gas outlet temperature of the eco-heating surface. If it is determined that the inlet temperature (te), the outlet gas temperature (Te) within the margin of error within the error range now comprises the step of calculating at the end all the boiler heat transfer surfaces.

The present invention proposes a method for calculating the temperature of the combustion gas and the temperature of steam before and after the heat transfer surface with the measured flow rate and temperature value of the steam on the first heat transfer surface in the boiler to obtain the actual internal temperature value of the boiler. It is possible to calculate the temperature of the steam inside this impossible hot boiler and on many heating surfaces without instruments, and calculate the calculated steam and measured steam temperature using both the gas and steam temperature measurements. In addition, by comparing both the calculated gas temperature and the measured gas temperature, the calculation is performed to minimize the error, thereby increasing the accuracy.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail with reference to the accompanying drawings in order to describe in detail enough to enable those skilled in the art to easily carry out the present invention. . Other objects, features, and operational advantages, including the purpose, operation, and effect of the present invention will become more apparent from the description of the preferred embodiments.

For reference, the embodiments disclosed herein are only presented by selecting the most preferred embodiment in order to help those skilled in the art from the various possible examples, the technical spirit of the present invention is not necessarily limited or limited only by this embodiment Rather, various changes, additions, and changes are possible within the scope without departing from the spirit of the present invention, as well as other equivalent embodiments.

1 is a block diagram of an internal temperature calculation system of a boiler according to an embodiment of the present invention.

As shown in Figure 1, the configuration of the internal temperature calculation system of the boiler according to an embodiment of the present invention, the heat transfer surface gas inlet temperature (T1), steam inlet temperature (t1), gas flow rate (Wg) of the boiler And, the measuring unit 10 for measuring the steam flow rate (Ws), and the storage database 20 for storing the data input from the measuring device 10 and the temperature calculation results performed by the calculation module 30 and The four ports where hot gas and low temperature steam are exchanged on the boiler's heat transfer surface, that is, the inlet has a gas inlet temperature (T1), a gas outlet temperature (T2), a steam inlet temperature (t1), and a steam outlet temperature (t2). The gas inlet temperature (T1) and the steam inlet temperature (t1) are calculated by comparing the gas outlet temperature (T2) and the heat outlet heat (T2) to obtain the gas outlet temperature (T2) and steam outlet temperature (t2). A calculation module 30 for obtaining T2) and a steam outlet temperature t2, and a boiler Comparing the calculated value and the measured value on the exit Eco heating surface and if the tolerance is out of the comparator 40 for calculating the calculation module 30 again, and displays the result of the temperature calculation performed by the calculation module 30 It comprises a monitoring unit 50 for.

The calculation module 30 sequentially sets the gas outlet temperature T2 obtained as the gas inlet temperature T1 for the next heat transfer surface, and the steam outlet temperature t2 is the steam inlet temperature t1. Perform the performance calculation for the entire heat transfer tube group, but the gas outlet temperature (T2) of the last heat transfer surface calculated by the calculation is within the error range and the measured gas outlet temperature (Te) installed here, and the steam inlet temperature (t1). In addition, it compares the measured steam inlet temperature (te) and repeatedly calculates the initial gas inlet temperature (T1) until it is within the error range. Is done.

The calculation module 30 has a configuration in which the gas outlet temperature T2 is determined when the two heat quantities are within an error range by comparing the absorption heat amount and the heat transfer heat value on the assumption of the gas outlet temperature T2.

The calculation module 30 has a gas outlet temperature calculated value T2 and a gas outlet temperature measured value Te within a tolerance at a specific position (usually the last heat transfer surface), and the steam inlet temperature calculated value t1. And steam inlet temperature measured value (te) is also configured to verify the calculation accuracy by performing the temperature calculation while changing the gas inlet temperature (T1) until within the tolerance.

The calculation module 30, when four temperature values are obtained, is configured to calculate the heat of absorption in the boiler using the gas discharge heat or steam absorption calorie equation.

In the calculation module 30, the gas outlet temperature calculated value T2 and the gas outlet temperature measured value Te are within the tolerance, and the steam inlet temperature calculated value t1 and the steam inlet temperature measured value te are also included. It is configured to provide the user with the result of performing the performance calculation while changing the gas inlet temperature T1 until it is within the tolerance.

2 is a flowchart illustrating a method of calculating an internal temperature of a boiler according to an embodiment of the present invention.

As shown in Figure 2, the configuration of the internal temperature calculation method of the boiler according to an embodiment of the present invention, the step (S10) to arbitrarily assume the gas outlet temperature (T2) and the amount of heat emitted gas (Q = Wg * Cpg * (T1-T2)) to obtain (S11), the steam outlet temperature t2 from the steam absorption calorie equation (Q = Ws * Cps * (t2-t1)) (S12), and heat transfer Obtaining absorbed heat quantity Q using equation {Q = U * A * [(T1-t2)-(T2-t2)] / ln [(T1-t1) / (T2-t2)]} (S13) ), And determining whether the calculated amount of heat absorbed by heat transfer is within the error (S14), and determining whether the amount of heat emitted from the gas is equal to the amount of heat absorbed by heat transfer (S15), and the calculation of the first heat transfer surface is performed. When it is completed, performing the same process as above for the next heat transfer tube group (S16), and the steam inlet temperature, steam outlet temperature, gas inlet temperature, gas outlet temperature of the eco-heating surface, which is the last heating surface of the boiler (S17) and determining whether the steam inlet temperature and the gas outlet temperature of the Eco heating surface are within the measured steam inlet temperature (te), the gas outlet temperature (Te) and the error range of the Eco heating surface (S18). And, if within the error range is now made including the step (S19) to end the calculation on all the heat transfer surface in the boiler.

With the above configuration, the operation of the internal temperature calculation system and method of the boiler according to the embodiment of the present invention is as follows.

A boiler is a device that produces steam in the necessary conditions through heat exchange between gas and steam.

The hot combustion gas produced by the combustion reaction of fuel and air releases heat to the low temperature steam flowing in the heat transfer surface to produce high temperature steam, and the combustion gas is cooled as a result of heat exchange and exits the boiler to the atmosphere. Spreads.

In this case, the heat of the gas after the combustion reaction passes through the heat transfer surface on which the steam in the boiler flows, whereby the hot gas is cooled, and the low temperature steam flowing in the heat transfer surface is heated to achieve thermal equilibrium.

The heat absorption-related calculation formula is described to explain the heat exchange phenomenon until the thermal equilibrium, and the heat exchange capacity in each heat transfer tube group is sequentially performed.

The data obtained from the measuring instrument 10 measuring the heat transfer surface gas inlet temperature (T1), steam flow rate (Ws), and steam inlet temperature (t1) of the boiler is sent to the storage database 20. 20 receives the measured data from the measuring unit 10 and converts the measured data into a digital signal, and provides the data converted into the digital signal to the calculation module 30.

The calculation module 30 calculates the performance by using the transmitted data to obtain an unknown gas temperature and steam temperature by calculation.

The comparison unit 40 compares the calculated value and the measured value in the boiler exit Eco heat transfer surface, and calculates the calculation module 30 again when it is out of the tolerance. At this time, the calculation module 30 performs an iterative calculation, and when it is completed, compares the calculated steam inlet temperature t1 and the measured steam inlet temperature te again in the comparator 40 until it falls within an error range. Perform verification to complete.

The calculation module 30 also performs heat absorption calculation using the temperature calculation result. Thermometer calculation results performed by the calculation module 30 is stored in the storage database 20, provided to the monitoring unit 50 is monitored by the user.

The process of obtaining the unknown gas temperature and steam temperature by the calculation module 30 will be described in more detail as follows.

First, the calculation module 30 calculates the amount of heat Q emitted from the combustion gas to the steam in the heat transfer surface by the following equation.

Q = Wg * Cpg * (T1-T2)

In order to obtain this, it is necessary to know the flow rate of the gas (Wg), the constant pressure specific heat (Cpg) of the combustion gas and the temperature decrease difference (T1-T2) of the combustion gas. The flow rate (Wg) of the gas generated by the reaction of the fuel can be obtained by using information provided such as fuel property, fuel flow rate, and calorific value of the fuel consumed in the boiler, and the constant pressure specific heat (Cpg) of the combustion gas is also obtained. It can be obtained from such a reaction equation and a gas table. Therefore, knowing only the difference between the inlet and outlet temperature reduction (T1-T2) of the combustion gas on the heat transfer surface, it is possible to obtain the amount of heat released from the gas to steam.

Next, the heat quantity Q which steam absorbs from combustion gas is calculated | required by the following formula.

Q = Ws * Cps * (t2-t1)

Here, the flow rate Ws of steam is measured, and the static pressure specific heat Cps of steam can also be obtained from the steam table. Therefore, it is possible to obtain the amount of heat of absorption of steam only by knowing the difference between the inlet and outlet temperature increase (t2-t1) of the steam on the heat transfer surface.

3 is a view showing a heat exchange relationship for the first heat transfer surface in the boiler. The gas inlet temperature T1 is the value given arbitrarily among the four temperature values heat-exchanged in FIG. 3, and the steam inlet temperature t1 is also the value which it knows and is known. That is, although the gas inlet temperature T1 is a high temperature and is a value set arbitrarily without installing the measuring instrument 10 in the field, the steam inlet temperature t1 is a known value because the measuring instrument 10 is installed in the field. Possible values Therefore, unknown values are the gas outlet temperature T2 and the steam outlet temperature t2. In other words, you can solve the system of inequalities that two know and two don't know.

In an embodiment of the present invention, two unknown gas outlet temperatures (T2) and steam outlet temperatures (t2) are obtained by the following procedure in a try & error manner.

First, the calculation module 30 arbitrarily assumes the gas outlet temperature T2 in the calorie expression emitted from the gas to the heat transfer surface (S10).

Next, the calculation module 30 calculates the amount of heat emitted from the gas (Q = Wg * Cpg * (T1-T2)) (S11). Steam is absorbed and heat-exchanged by the amount of heat released by the gas (gas discharged heat = steam absorbed heat).

Subsequently, the calculation module 30 applies the steam absorption calorific value (Q = Ws * Cps * (t2-t1) (S12), and the steam outlet temperature t2, which is an unknown figure remaining from the following variation of the steam absorption calorie equation, is obtained. )

t2 = t1 + Q / Ws * Cps

Next, the calculation module 30 obtains the absorbed heat amount Q using the following heat transfer equation (S13), and determines whether the absorbed heat amount due to the calculated heat transfer is within an error (S14).

Q = U * A * [(T1-t2)-(T2-t2)] / ln [(T1-t1) / (T2-t2)]

In this case, the calories emitted by the gas, the heat absorbed by the steam, and the heat absorbed by the heat transfer are different from each other in terms of calculation formulas, and the values must be the same.

Therefore, it is determined whether the amount of heat emitted from the gas (or the heat of steam absorption) obtained above is the same as the amount of heat absorbed by the heat transfer (S15), so that the amount of heat emitted from the gas (or the heat absorbed by the steam) becomes the same as the heat of heat absorbed by the heat transfer. If they match, the calculation ends and the gas outlet temperature T2 and the steam outlet temperature t2 are determined.

If the two calories do not coincide, the gas outlet temperature (T2) is changed again until the two calories coincide, and the calculation is repeated, and the calorific value of gas discharge (or steam absorption heat) and the heat of absorption by heat transfer. When it falls within this desired error range, calculation is complete | finished and gas outlet temperature T2 and steam outlet temperature t2 are determined.

In this way, four temperatures surrounding the heat transfer surface, that is, the gas inlet temperature T1, the gas outlet temperature T2, the steam inlet temperature t1, and the steam outlet temperature t2 are obtained.

When the calculation for the first heat transfer surface is completed, the calculation module 30 performs the same process as above with respect to the second heat transfer surface that is the next heat transfer tube group (S16). In this case, the gas outlet temperature T2 calculated on the first heat transfer surface becomes the gas inlet temperature T1 on the second heat transfer surface, and the steam outlet temperature t2 becomes the steam inlet temperature t1.

In this way, the steam inlet temperature, the steam outlet temperature, the gas inlet temperature, and the gas outlet temperature of the Eco heating surface, which is the last heating surface of the boiler, are obtained (S17).

The steam inlet temperature (t1) and the gas outlet temperature (T2) of the eco-heating surface calculated by the above procedure are installed on the eco-heating surface by measuring the steam inlet temperature gauge and the gas outlet temperature meter (te). ), It is determined whether the gas outlet temperature (Te) and within the error range (S18), if within the error range, the calculation is now completed on all heat transfer surfaces in the boiler (S19).

However, if it is outside the error range, change the gas inlet temperature (T1) of the first heating surface to another value and proceed with the calculation procedure from the beginning again, and calculate the steam inlet temperature (t1) and steam inlet temperature measurement value ( te), the gas outlet temperature calculated value T2 and the gas outlet temperature measured value Te are calculated until they fall within the error range (S10 to S16), and are completed if they match within the error range (S17).

In addition, when the four temperature values are obtained, the absorption heat amount (Q) of the heat transfer surface can also be obtained by using a gas emission calorific value or a steam absorption calorie equation.

When the calculation is completed, the inlet and outlet temperatures of the gas and steam passing through all the heat transfer surfaces inside the boiler are calculated, and the above calculated results are shown in FIG. 4 as a sample.

In Figure 4, red is the gas temperature, blue is the temperature of steam. The steam inlet temperature (t1) of the first heat transfer tube group is a known value measured at 423 ° C, and the steam flow rate (Ws) is also a measured value. The gas inlet temperature T1 is given one end at an arbitrary value.

As shown in FIG. 4 through the repeated calculation as mentioned above, the gas inlet temperature T1 is 1,175 ° C. At this time, the gas outlet temperature T2 is 1,089 ° C and the steam outlet temperature t2 is 464 ° C. The calculation was completed by converging.

In the second heating surface located next, the gas inlet temperature of 1,089 ℃ becomes the gas inlet temperature of the first heating surface and the steam outlet temperature of 464 ℃ becomes the steam inlet temperature. In the heat plane, it converges within the error range, and there is no big error between the steam inlet temperature measurement value (te) 260 ° C and the gas outlet temperature measurement value (Te) 346 ° C. The temperature state of can be known.

1 is a block diagram of an internal temperature calculation system of a boiler according to an embodiment of the present invention.

2 is a flowchart illustrating a method of calculating an internal temperature of a boiler according to an embodiment of the present invention.

3 is a view showing a heat exchange relationship for the first heat transfer surface in the boiler.

4 is a view showing a sample of the results calculated by the internal temperature calculation system of the boiler according to an embodiment of the present invention.

Explanation of symbols on the main parts of the drawings

10: measuring instrument 20: database for storage

30: calculation module 40: comparison unit

50: monitoring part

Claims (12)

Measurement unit for measuring the gas inlet temperature (T1), steam inlet temperature (t1), gas flow rate (Wg), steam flow rate (Ws) of the boiler, A storage database for storing data input from the measuring unit and a temperature calculation result performed by the calculation module; Four ports where hot gas and low temperature steam are exchanged on the heat transfer surface of the boiler, i.e., the gas inlet temperature (T1), gas outlet temperature (T2), steam inlet temperature (t1) and steam outlet temperature (t2) In the gas inlet temperature T1 and steam inlet temperature t1, the gas outlet temperature T2 is determined by comparing absorption heat and heat transfer calories in order to obtain the gas outlet temperature T2 and the steam outlet temperature t2 in a given state. ), And a calculation module for obtaining the steam outlet temperature (t2), Comprising a comparison unit for comparing the calculated value and the measured value at the boiler outlet Eco heat transfer surface and the calculation unit again to calculate the calculation module, and a monitoring unit for displaying the result of the temperature calculation performed by the calculation module System for calculating the internal temperature of a boiler. The method of claim 1, The calculation module 30 sequentially sets the gas outlet temperature T2 obtained as the gas inlet temperature T1 for the next heat transfer surface, and the steam outlet temperature t2 is the steam inlet temperature t1. Perform the performance calculation for all the heat transfer tube groups, but the gas outlet temperature (T2) of the last heat transfer surface calculated by the calculation is within the error range and the measured gas outlet temperature (Te) installed here, and the steam inlet temperature (t1) Compared to the measured steam inlet temperature (te), the initial gas inlet temperature (T1) is changed repeatedly until it is within the error range, and it is configured to calculate the temperature of the gas and steam in the boiler without calculation. Internal temperature calculation system of the boiler, characterized in that. The method of claim 1, The calculation module 30 is configured to compare the absorption heat and the heat transfer heat assuming the gas outlet temperature (T2) is configured to determine the gas outlet temperature (T2) when the two heat values are within the error range. Internal temperature calculation system of the boiler. The method of claim 1, The calculation module 30 has a gas outlet temperature calculated value T2 and a gas outlet temperature measured value Te within a tolerance at a specific position (usually the last heat transfer surface), and the steam inlet temperature calculated value t1. And the steam inlet temperature measured value (te) is also configured to verify the calculation accuracy by performing the temperature calculation while changing the gas inlet temperature (T1) until within the tolerance. The method of claim 1, The calculation module (30), the internal temperature calculation system of the boiler, characterized in that configured to calculate the heat of absorption in the boiler by using the gas emission calorie or steam absorption calorie formula when four temperature values are obtained. The method of claim 1, In the calculation module 30, the gas outlet temperature calculated value T2 and the gas outlet temperature measured value Te are within the tolerance, and the steam inlet temperature calculated value t1 and the steam inlet temperature measured value te are also included. Internal temperature calculation system of the boiler, characterized in that the configuration to provide the user with the result of performing the performance calculation while changing the gas inlet temperature (T1) until within the tolerance. Calculating gas discharge heat (Q = Wg * Cpg * (T1-T2)) by assuming gas outlet temperature (T2) arbitrarily; Obtaining a steam outlet temperature t2 from the steam absorption calorie equation (Q = Ws * Cps * (t2-t1); Calculating the absorbed heat quantity Q using the heat transfer equation {Q = U * A * [(T1-t2)-(T2-t2)] / ln [(T1-t1) / (T2-t2)]} , Determining whether the amount of heat absorbed by the calculated heat transfer is within an error, and determining whether the amount of heat emitted from the gas is equal to the amount of heat absorbed by the heat transfer; After the calculation of the first heat transfer surface is completed, perform the same process as above for the next heat transfer tube group to obtain the steam inlet temperature, steam outlet temperature, gas inlet temperature, and gas outlet temperature of the eco-heating surface, the last heating surface of the boiler. Steps, If the steam inlet temperature and the gas outlet temperature of the eco heating surface are within the measured steam inlet temperature (te), the gas outlet temperature (Te) of the eco heating surface, and within the error range, it is now possible to Method for calculating the internal temperature of the boiler comprising the step of terminating the calculation. The method of claim 7, wherein For the next heat transfer surface, the gas outlet temperature (T2) obtained above is the gas inlet temperature (T1), and the steam outlet temperature (t2) is the steam inlet temperature (t1). The gas outlet temperature (T2) of the last heat transfer surface calculated by calculation is within the error range of the measured gas outlet temperature (Te) installed here, and the steam inlet temperature (t1) is also measured with the measured steam inlet temperature (te). Comparing repeatedly calculating the initial gas inlet temperature (T1) until it is within the error range by comparing and calculating the temperature of the gas and steam in the boiler by calculation without depending on the measurement How to calculate the temperature. The method of claim 7, wherein A method for calculating the internal temperature of a boiler comprising the step of determining the gas outlet temperature (T2) when the two heat values are within an error range by comparing the absorbed heat and the heat transfer heat on the assumption of the gas outlet temperature (T2). . The method of claim 7, wherein The gas outlet temperature calculated value (T2) and the gas outlet temperature measured value (Te) are within tolerances at a specific position (usually the last heating surface), and the steam inlet temperature calculated value (t1) and steam inlet temperature measured value (te) The method of calculating the internal temperature of a boiler comprising the step of verifying the calculation accuracy by performing a temperature calculation while changing the gas inlet temperature (T1) until it falls within the tolerance. The method of claim 7, wherein The method of calculating the internal temperature of the boiler comprising the step of calculating the absorbed heat in the boiler using the gas emission calorie or the steam absorption calorie equation when four temperature values are obtained. The method of claim 7, wherein The gas inlet temperature until the gas outlet temperature calculated value (T2) and the gas outlet temperature measured value (Te) are within tolerance, and the steam inlet temperature calculated value (t1) and steam inlet temperature measured value (te) are within tolerance. The method of calculating the internal temperature of the boiler comprising the step of providing the user with the result of performing the performance calculation while changing (T1).

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