A method for querying radiative and convective heat loss values

Abstract

An embodiment of the present application discloses a method for querying radiative and convective heat loss values, which is used in the field of data processing and includes: obtaining the maximum continuous thermal power of the unit, the actual thermal power of the unit, the wind speed on the surface of the boiler, and the temperature difference between the surface of the boiler and the environment; fitting the ABMA radiative loss standard curve into the first radiative loss curve; obtaining the second radiative loss curve according to the maximum continuous thermal power of the unit, the actual thermal power of the unit, and the first radiative loss curve; obtaining the radiative loss value corresponding to the actual thermal power of the unit according to the second radiative loss curve; fitting the wind speed & temperature difference correction curve to obtain the target correction curve; obtaining the target correction coefficient corresponding to the wind speed and temperature difference according to the wind speed, temperature difference, and target correction curve; obtaining the radiative and convective heat loss value according to the radiative loss value and the target correction coefficient. In the embodiment of the present application, by fitting the ABMA radiative loss standard curve and the wind speed & temperature difference correction curve, the radiative and convective heat loss values are automatically queried.

Description

Technical Field

[0001] The embodiments of the present application relate to the field of data processing, and in particular, to a method for querying radiative and convective heat loss values. Background Art

[0002] A boiler is an energy conversion device. The energy input to the boiler includes forms such as chemical energy in fuel, electrical energy, and thermal energy of high-temperature flue gas. After being converted by the boiler, it can output steam, high-temperature water, or organic heat carriers with a certain amount of thermal energy, which are mostly used in thermal power plants, ships, locomotives, and industrial and mining enterprises. Currently, boilers have become special equipment with wide applications, and the performance of boilers needs to be tested during use.

[0003] Currently, the more commonly used international boiler performance test standards are PTC4 or PTC4.1 issued by the American Society of Mechanical Engineers (ASME). Before 1998, the standard for ASME boiler performance tests was PTC4.1. Although PTC4 is the latest ASME boiler performance test standard, due to the application of PTC4.1 in the previous decades and PTC4.1 being proven to be very in line with engineering practice and widely accepted by all parties, while PTC4 makes the test requirements more complex in order to pursue higher accuracy, so the application of PTC4.1 is still very extensive at present. Especially in boiler manufacturing, PTC4.1 is often used as the performance acceptance standard in technical agreements. Therefore, it is very necessary to further research and apply PTC4.1.

[0004] In the process of applying PTC4.1, for the radiative and convective heat loss terms therein, it is necessary to manually query the corresponding curve graphs. When the test results need to be reasonably corrected, researchers have to frequently check the graphs and compare them on the curve graphs to obtain the radiative and convective loss terms, which is prone to introducing subjective errors and is rather complicated. Therefore, there is an urgent need for an automatic query method for radiative and convective heat loss terms that can automatically query the radiative and convective heat loss terms. Summary of the Invention

[0005] The embodiments of the present application provide a method for querying radiative and convective heat loss values, which automatically queries the radiative and convective heat loss values by fitting the ABMA radiative loss standard curve and the wind speed & temperature difference correction curve.

[0006] The embodiments of the present application provide a method for querying radiative and convective heat loss values, which is applied to a boiler reporting system. The boiler reporting system includes: an ABMA radiative loss standard curve and a wind speed & temperature difference correction curve. The method includes:

[0007] Obtain the maximum continuous thermal power of the unit, the actual thermal power of the unit, the wind speed on the boiler surface, and the temperature difference between the boiler surface and the environment;

[0008] Fit the ABMA radiation loss standard curve to a first radiation loss curve;

[0009] Obtain a second radiation loss curve based on the maximum continuous thermal power of the unit, the actual thermal power of the unit, and the first radiation loss curve;

[0010] Obtain a radiation loss value corresponding to the actual thermal power of the unit according to the second radiation loss curve;

[0011] Fit the wind speed & temperature difference correction curve to obtain a target correction curve;

[0012] Obtain a target correction coefficient corresponding to the wind speed and the temperature difference according to the wind speed, the temperature difference, and the target correction curve;

[0013] Obtain the radiation and convective heat loss value according to the radiation loss value and the target correction coefficient.

[0014] Further, before the equation of fitting the ABMA radiation loss standard curve to the first radiation loss curve, the method further includes:

[0015] Discretize the non-uniform coordinate system in the ABMA radiation loss standard curve into a uniform coordinate system;

[0016] The fitting of the ABMA radiation loss standard curve to the first radiation loss curve includes:

[0017] Take multiple coordinate points corresponding to the ABMA radiation loss standard curve on the uniform coordinate system;

[0018] Fit the multiple coordinate points to the first radiation loss curve.

[0019] Further, the ABMA radiation loss standard curve includes: a radiation loss curve at maximum continuous thermal power, a radiation loss line corresponding to the maximum continuous thermal power, and a water-cooled furnace wall number scale correction curve;

[0020] The fitting of the multiple coordinate points to the first radiation loss curve includes:

[0021] Fit multiple coordinate points corresponding to the radiation loss curve at maximum continuous thermal power to a first polynomial curve;

[0022] Fit multiple coordinate points corresponding to the radiation loss line corresponding to the maximum continuous thermal power to a second polynomial curve;

[0023] Fit multiple coordinate points corresponding to the water-cooled furnace wall number scale correction curve to a third polynomial curve, and the first radiation loss curve includes the first polynomial curve, the second polynomial curve, and the third polynomial curve.

[0024] Further, obtaining the second radiation loss curve according to the maximum continuous thermal power of the unit, the actual thermal power of the unit, and the first radiation loss curve includes:

[0025] Arranging the coordinate value pairs of the non-uniform coordinate system and the uniform coordinate system in sequence to obtain a coordinate value combination;

[0026] According to the maximum continuous thermal power of the unit and the coordinate value combination, determining a first mapping value corresponding to the maximum continuous thermal power of the unit on the x-axis of the uniform coordinate system;

[0027] Inputting the first mapping value into the first polynomial curve to obtain a first ordinate value;

[0028] Updating the second polynomial curve according to the first mapping value and the first ordinate value;

[0029] According to the actual thermal power of the unit and the coordinate value combination, determining a second mapping value corresponding to the actual thermal power of the unit on the x-axis of the uniform coordinate system;

[0030] Inputting the second mapping value into the updated second polynomial curve to obtain a second ordinate value;

[0031] Updating the third polynomial curve according to the second ordinate value, and taking the updated third polynomial curve as the second radiation loss curve.

[0032] Further, obtaining the radiation loss value corresponding to the actual thermal power of the unit according to the second radiation loss curve includes:

[0033] Obtaining a third ordinate value according to the intersection point of the second radiation loss curve and the y-axis in the uniform coordinate system;

[0034] According to the third ordinate value and the coordinate value combination, determining a third mapping value corresponding to the third ordinate value on the non-uniform coordinate system, and taking the third mapping value as the radiation loss value corresponding to the actual thermal power of the unit.

[0035] Further, obtaining the maximum continuous thermal power of the unit and the actual thermal power of the unit includes:

[0036] Through the formula Q BMCR = m coal Q net,ar E f Obtaining the maximum continuous thermal power of the unit;

[0037] Wherein, the m coal is the designed coal consumption at the maximum output of the boiler, and the Q net,arFor the low calorific value of the designed coal type, the E f For the boiler design efficiency, the Q BMCR Is the maximum continuous thermal power of the unit;

[0038] Through the formula Q r =Q BMCR D gr,real / D gr The actual thermal power of the unit is obtained;

[0039] Among them, the Q BMCR Is the maximum continuous thermal power of the unit, the D gr Is the main steam flow rate at the maximum output of the boiler, the D gr,real Is the main steam flow rate at the actual output of the boiler, and the Q r Is the actual thermal power of the unit.

[0040] Furthermore, the obtaining of the target correction coefficient corresponding to the wind speed and the temperature difference according to the wind speed, the temperature difference and the target correction curve includes:

[0041] Determine the first correction curve and the second correction curve in the target correction curve according to the wind speed, where the wind speeds corresponding to the first correction curve and the second correction curve are respectively on both sides of the wind speed;

[0042] Through the formula E Δt,v =f l (Δt)+(v - v l ) / (v u - v l )(f u (Δt)-f l (Δt)) to obtain the emissivity corresponding to the wind speed and the temperature difference; among them, the E Δt,v Is the emissivity, the f l (Δt) is the first correction curve with the temperature difference as the independent variable, the v is the temperature difference, the v l Is the wind speed corresponding to the first correction curve, the v u Is the wind speed corresponding to the second correction curve, and the f u (Δt) is the second correction curve with the temperature difference as the independent variable;

[0043] Through the formula Coef = E Δt,v / 125 to obtain the target correction coefficient;

[0044] Among them, the Coef is the target correction coefficient, and the E Δt,v Is the emissivity.

[0045] Further, obtaining the radiative and convective heat loss value from the radiative loss value and the target correction coefficient includes:

[0046] By using the formula L R = 0.75L R,ABMA Coef to obtain the radiative and convective heat loss value;

[0047] Wherein, the L R is the radiative and convective heat loss value, the L R,ABMA is the radiative loss value, the Coef is the target correction coefficient, and the 0.75 is the correction coefficient for the boiler wall arrangement of four-sided water cooling.

[0048] An embodiment of the present application also discloses a boiler reporting system, including:

[0049] An acquisition unit, configured to acquire the maximum continuous thermal power of the unit, the actual thermal power of the unit, the wind speed on the boiler surface, and the temperature difference between the boiler surface and the environment;

[0050] A first fitting unit, configured to fit the ABMA radiative loss standard curve into a first radiative loss curve;

[0051] A first execution unit, configured to obtain a second radiative loss curve according to the maximum continuous thermal power of the unit, the actual thermal power of the unit, and the first radiative loss curve;

[0052] A second execution unit, configured to obtain the radiative loss value corresponding to the actual thermal power of the unit according to the second radiative loss curve;

[0053] A second fitting unit, configured to fit the wind speed & temperature difference correction curve to obtain a target correction curve;

[0054] A third execution unit, configured to obtain the target correction coefficient corresponding to the wind speed and the temperature difference according to the wind speed, the temperature difference, and the target correction curve;

[0055] A fourth execution unit, configured to obtain the radiative and convective heat loss value according to the radiative loss value and the target correction coefficient.

[0056] An embodiment of the present application also discloses a boiler reporting system, including:

[0057] A central processing unit, a memory, an input / output interface, a wired or wireless network interface, and a power supply;

[0058] The memory is a transient storage memory or a persistent storage memory;

[0059] The central processing unit is configured to communicate with the memory and execute the instruction operations in the memory to perform the method for querying the radiative and convective heat loss values as described above.

[0060] As can be seen from the above technical solutions, the embodiments of the present application have the following advantages:

[0061] The embodiments of the present application disclose a method for querying radiative and convective heat loss values. The radiative loss value corresponding to the actual thermal power of the unit is obtained through the fitted ABMA radiative loss standard curve, the maximum continuous thermal power of the unit, and the actual thermal power of the unit. The target correction coefficient corresponding to the wind speed and temperature difference is obtained through the fitted wind speed & temperature difference correction curve, the wind speed, and the temperature difference; according to the radiative loss value and the target correction coefficient, the radiative and convective heat loss values can be automatically obtained. BRIEF DESCRIPTION OF THE DRAWINGS

[0062] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the drawings in the following description are only some embodiments recorded in the present application. For those of ordinary skill in the art, other drawings can also be obtained based on these drawings.

[0063] Figure 1 It is a flowchart for querying radiative and convective loss values disclosed in the embodiments of the present application;

[0064] Figure 2 It is a schematic diagram of the ABMA radiative loss standard curve disclosed in the embodiments of the present application;

[0065] Among them, x0 represents the horizontal axis of the non-uniform coordinate system, y0 represents the vertical axis of the non-uniform coordinate system, x represents the horizontal axis of the uniform coordinate system, y represents the vertical axis of the uniform coordinate system, curve 3 represents the radiative loss curve at the maximum continuous thermal power, curve 4 represents the radiative loss line when the maximum continuous thermal power is a certain value, curve 5 represents the correction curve of the water-cooled furnace wall number scale, p1 represents the point of the maximum continuous thermal power of the unit, p2 represents the intersection point of the maximum continuous thermal power point of the unit and curve 3, p3 represents the point of the actual thermal power of the unit, p4 represents the intersection point of the actual thermal power point of the unit and curve 4, p5 represents the radiative loss point when the water-cooled furnace wall number is 0, and p6 represents the radiative loss point when the water-cooled furnace wall number is 4;

[0066] Figure 3 It is a schematic diagram of the wind speed & temperature difference correction curve disclosed in the embodiments of the present application;

[0067] Figure 4 It is a schematic diagram of a coordinate value pair disclosed in the embodiments of the present application;

[0068] Figure 5 It is a schematic diagram of a boiler reporting system disclosed in the embodiments of the present application;

[0069] Figure 6 This is another schematic diagram of the boiler reporting system disclosed in the embodiments of the present application. Detailed implementation manners

[0070] To enable those skilled in the art to better understand the solution of the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present application.

[0071] In the description of the embodiments of the present application, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the accompanying drawings. It is only for the convenience of describing the embodiments of the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the embodiments of the present application.

[0072] In the description of the embodiments of the present application, it should be noted that unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to specific situations.

[0073] In the process of applying ASME PTC4.1, for the radiation and convective heat loss terms therein, it is necessary to manually query the corresponding curve graphs. When the test results need to be reasonably corrected, researchers have to frequently check the graphs. Each time they check the graphs, they need to make comparisons on the curve graphs to obtain the radiation and convective loss terms, which is prone to introducing subjective errors and is rather complicated. Therefore, the embodiments of the present application provide a method for querying the radiation and convective heat loss values, as Figure 1 shown, which can automatically query the radiation and convective heat loss values. The specific steps are as follows:

[0074] 101. Obtain the maximum continuous thermal power of the unit, the actual thermal power of the unit, the wind speed on the boiler surface, and the temperature difference between the boiler surface and the environment.

[0075] This embodiment of the present application is mainly applied to a boiler reporting system (automatic reporting system). In this boiler reporting system, the ABMA radiation loss standard curve and the wind speed & temperature difference correction curve in ASME PTC4.1 are pre-stored and can be called later. Before the boiler reporting system automatically queries the radiation and convection loss values, certain boiler-related data needs to be input. This boiler-related data is obtained based on the actual measurement of the on-site boiler. This boiler-related data mainly includes the main steam flow rate at the maximum output of the boiler (D gr ), the main steam flow rate at the actual output of the boiler (D gr,real ), the designed coal consumption at the maximum output of the boiler (m coal ), the low calorific value of the designed coal type (Q net,ar ), the designed efficiency of the boiler (E f ), the wind speed on the boiler surface (v), and the temperature difference between the boiler surface and the environment (Δt). Based on these boiler-related data, the maximum continuous thermal power and the actual thermal power of the boiler unit can be obtained.

[0076] 102. Fit the ABMA radiation loss standard curve to the first radiation loss curve.

[0077] The boiler reporting system can fit the pre-stored ABMA radiation loss standard curve to the first radiation loss curve. Specifically, multiple coordinate points can be taken from the ABMA radiation loss standard curve and fitted to the first radiation loss curve according to these multiple coordinate points. It can be understood that the ABMA radiation loss standard curve contains multiple radiation loss standard curves. In the boiler reporting system, a certain number of coordinate points need to be taken from multiple radiation loss curves respectively and fitted to multiple first radiation loss curves. Generally, the more the number of the certain number of coordinate points taken, the more accurate the fitted first radiation loss curve. This fitting refers to obtaining the corresponding equation based on the coordinate points of the curve, and the first radiation loss curve is mainly used to represent the corresponding equation.

[0078] Furthermore, in this embodiment of the present application, the coordinate system corresponding to the ABMA radiation loss standard curve is a non-uniform coordinate system. For the convenience of statistics, it needs to be fitted to the first radiation loss curve in a uniform coordinate system. And in the equation corresponding to the fitted first radiation loss curve, there are still some unknowns.

[0079] 103. Obtain the second radiation loss curve based on the maximum continuous thermal power of the unit, the actual thermal power of the unit, and the first radiation loss curve.

[0080] The boiler reporting system obtains the second radiation loss curve based on the maximum continuous thermal power of the unit, the actual thermal power of the unit, and the first radiation loss curve. Specifically, the boiler reporting system substitutes the maximum continuous thermal power of the unit and the actual thermal power of the unit obtained in the above steps into the first radiation loss curve, and can obtain the specific data of the unknown quantity in the first radiation loss curve. The first radiation loss curve with the specific data of the obtained unknown quantity is used as the second radiation loss curve.

[0081] It can be understood that the boiler reporting system can substitute the maximum continuous thermal power of the unit and the actual thermal power of the unit into the first radiation loss curve, and according to the methods of interpolation and coordinate mapping, take the intersection points with the first radiation loss curve to obtain the specific data of the unknown quantity in the first radiation loss curve. And the corresponding second radiation loss curve is also a curve in the uniform coordinate system.

[0082] 104. Obtain the radiation loss value corresponding to the actual thermal power of the unit according to the second radiation loss curve.

[0083] The boiler reporting system obtains the radiation loss value corresponding to the actual thermal power of the unit according to the second radiation loss curve. Specifically, in the second radiation loss curve obtained according to the ABMA radiation loss standard curve, the intersection point of the second radiation loss curve and the y-axis of the uniform coordinate system can be used, and the intersection point is obtained through interpolation and coordinate mapping to obtain the radiation loss value corresponding to the actual thermal power of the unit.

[0084] 105. Fit the wind speed & temperature difference correction curve to obtain the target correction curve.

[0085] The boiler reporting system can fit the wind speed & temperature difference correction curve to obtain the target correction curve. Specifically, multiple coordinate points can be taken on the wind speed & temperature difference correction curve, and the target correction curve is fitted according to the multiple coordinate points. It can be understood that there are 7 correction curves with different wind speeds in the wind speed & temperature difference correction curve, and the corresponding target correction curve is also 7 correction curves with different wind speeds, and the target correction curve is a correction curve in the uniform coordinate system.

[0086] It should be noted that the sequence relationship among steps 101, 102, and 105 is not limited.

[0087] 106. Obtain the target correction coefficient corresponding to the wind speed and temperature difference according to the wind speed, temperature difference, and target correction curve.

[0088] The boiler reporting system obtains the target correction coefficient corresponding to the wind speed and temperature difference of the boiler based on the wind speed on the boiler surface, the temperature difference between the boiler surface and the environment, and the target correction curve. It can be understood that the boiler reporting system can use the interpolation method to determine two correction curves from 7 correction curves according to the wind speed on the boiler surface, and substitute the temperature difference into the two correction curves to obtain the target correction coefficient corresponding to the wind speed and temperature difference.

[0089] 107. Obtain the radiative and convective heat loss values based on the radiation loss value and the target correction coefficient.

[0090] In the automatic reporting system, the radiative and convective heat loss values are obtained based on the radiation loss value and the target correction coefficient. It can be understood that when the relevant data of the boiler are input into the automatic reporting system, the automatic reporting system will obtain the radiation loss value in the ABMA radiation loss standard curve according to the input data, and obtain the target correction coefficient in the wind speed & temperature difference correction curve. According to the radiation loss value and the target correction coefficient, the radiative and convective heat loss values are output.

[0091] A method for querying the radiative and convective heat loss values provided by an embodiment of the present application can automatically obtain the radiative and convective heat loss values. For the curve graphs used to calculate the radiative and convective heat loss terms in ASME PTC4.1, methods such as coordinate mapping, curve fitting, and interpolation are adopted to realize the automatic query of the ABMA radiation loss standard curve; at the same time, methods such as curve fitting and interpolation are adopted to realize the automatic query of the wind speed & temperature difference correction curve. After the two are combined, the radiative and convective heat loss values (i.e., the radiative and convective heat loss percentages) of the boiler can be automatically calculated. Further, it solves the repetitive work problem of manually querying relevant curve graphs to calculate the radiative and convective heat loss terms in the boiler efficiency test report, and realizes the automatic calculation of this loss term; automates the work of manual chart querying, which is beneficial to eliminating errors caused by human subjective factors and improving the accuracy and standardization of boiler efficiency calculation; this method can be integrated into the boiler efficiency automatic reporting system, which is of great significance for improving the automation and standardization level of test reports in the industry.

[0092] To more clearly describe the process of querying the radiative and convective heat loss values, the following will be combined with Figure 2 、 Figure 3 and Figure 4 , and specific data will be used to illustrate the implementation of the present application:

[0093] Figure 2 - In the ABMA radiation loss standard curve, the abscissa of the original coordinate system is defined as x0, and the ordinate of the original coordinate system is defined as y0. The main steam flow rate D of the maximum output of a boiler under a certain test condition gr = 1130 t / h, the main steam flow rate D of the actual output of the boiler gr,real= 871.5 t / h, the designed coal consumption m for the maximum boiler output coal = 142.84 t / h, the lower calorific value Q of the designed coal type net,ar = 21430 KJ / kg, the designed boiler efficiency E f = 94.4%, the maximum continuous thermal power Q of the unit can be calculated BMCR = m coal Q net,ar E f = 2740 MBtu / h and the actual thermal power Q of the unit r = Q BMCR D gr,real / D gr = 2113 MBtu / h. Among them, the main steam flow rate (D gr,real ) of the actual boiler output is the time average value of the DCS data during the on-site test.

[0094] The automatic reporting system can establish a uniform coordinate system xy on the original (x0y0) non-uniform coordinate system of the ABMA radiation loss standard curve, and uniformly discretize the x-axis and y-axis. It can be understood that when the x-axis and y-axis are uniformly discretized, the number of discrete points on each axis is greater than 200, and the more discrete points, the higher the solution accuracy. The abscissa of the discrete points on the x-axis is denoted as x(0), x(1), …, x(i), …, and the ordinate of the discrete points on the y-axis is denoted as y(0), y(1), … y(i)…, and at the same time, record the abscissa value x0(i) of x(i) in the x0y0 coordinate system, and the ordinate value y0(i) of y(i) in the x0y0 coordinate system, that is, the coordinate value of x(i) mapped to the x0y0 coordinate system is x0(i), and the coordinate value of y(i) mapped to the x0y0 coordinate system is y0(i). Among them, in the (x0y0) non-uniform coordinate system, the value range of x0 is 0 to 15000 MBtu / h (MBTU: million Btu, million British thermal units), and the value range of y0 is 0.1% to 20%; in the uniform coordinate system (xy), the value range of x is 0 to 100, and the value range of y is 0 to 50. Then, take multiple coordinate points corresponding to the ABMA radiation loss standard curve on the uniform coordinate system, and fit the multiple coordinate points into the first radiation loss curve.

[0095] Specifically, the ABMA radiation loss standard curve includes: Curve 3, Curve 4 and Curve 5. Among them, Curve 3 is Figure 2 the Radiation loss at Maximum cont.output curve in Figure 2The Maximum cont.Output of unit is X million Btu / h (the maximum continuous thermal power is a certain X million British thermal units per hour). When X is different, these curves form a family of curves, and this family of curves is a straight line with the same slope in the xy coordinate system. The specific slope is -0.8993; Curve 5 is Figure 2 The curve of Scale correction for water walls only (scale correction for water-cooled furnace walls). According to the different maximum continuous thermal powers and actual thermal powers of the unit, this curve forms a family of curves, and this family of curves is a straight line with the same slope in the xy coordinate system, and the slope is 0.9157. Therefore, in the xy coordinate system, an appropriate number of coordinate points can be taken from Curve 3 to fit and obtain a fifth-order polynomial equation f3 = a1x 5 +a2x 4 +a3x 3 +a4x 2 +a5x+a6; It can be understood that the number of coordinate points selected on Curve 3 can be 50 or 60. Specifically, it is not limited here. Preferably, this number should be greater than 48. Appropriate coordinate points are taken from Curve 4 to fit and obtain a first-order polynomial f4, whose slope is denoted as k4 and the intercept is unknown; Appropriate coordinate points are taken from Curve 5 to fit and obtain a first-order polynomial f5, whose slope is denoted as k5 and the intercept is unknown. It can be understood that this first radiation loss curve includes: the first polynomial curve f3, the second polynomial curve f4, and the third polynomial curve f5.

[0096] The automatic reporting system can arrange the coordinate value pairs of the non-uniform coordinate system and the uniform coordinate system in order to obtain a coordinate value combination. Specifically, the coordinate value pairs (x(i), x0(i)) and (y(i), y0(i)) can be arranged in ascending order to form a table S1 for query. The table S1 is as Figure 4 shown. According to the maximum continuous thermal power of this unit and this coordinate value combination, the first mapping value corresponding to the maximum continuous thermal power of the unit on the x-axis of the uniform coordinate system can be determined. Specifically, first, for Q BMCR = 2740 MBtu / h, in the table S1, sequentially search for the coordinate value pairs corresponding to the x0 values that are respectively greater than and less than itself, and then obtain its first mapping value on the x-axis by interpolation, denoted as p1 x , p1 x = 79.0222. Second, input this first mapping value into the first polynomial curve f3 to obtain the first ordinate value. Specifically, substitute p1 x = 79.0222 into f3 to find the corresponding first ordinate value p2 y , p2 y= 8.37. Third, update the second polynomial curve f4 according to the first mapping value and the first ordinate value. Specifically, substitute (p1 x , p2 y ) into f4, and the intercept of f4 is denoted as b4, b4 = 79.4344. Fourth, determine the second mapping value of the actual thermal power of the unit on the x-axis of the uniform coordinate system according to the actual thermal power of the unit and the coordinate value combination. Specifically, for Q r = 2113 MBtu / h, sequentially search in the table S1 for the coordinate value pairs corresponding to the x0 values that are respectively greater than and less than itself, and obtain its second mapping value on the x-axis by interpolation, denoted as p3 x , p3 x = 76.7084. Fifth, input the second mapping value into the updated second polynomial curve to obtain the second ordinate value. Specifically, substitute p3 x into f4 to find the corresponding second ordinate value p4 y , p4 y = 10.45. Sixth, update the third polynomial curve according to the second ordinate value, and use the updated third polynomial curve as the second radiation loss curve. Specifically, the x-axis coordinate of curve 6 is a fixed value, denoted as x6 = 3.1794. Substitute (x6, p4 y ) into f5 to obtain the intercept b5 = 7.54. Use f5 with the obtained intercept as the second radiation loss curve.

[0097] For a boiler with water-cooled walls arranged on four sides, the third ordinate value can be obtained according to the intersection of the second radiation loss curve and the y-axis in the uniform coordinate system; furthermore, according to the third ordinate value and the coordinate value combination, determine the third mapping value of the third ordinate value on the non-uniform coordinate system, and use the third mapping value as the radiation loss value corresponding to the actual thermal power of the unit. Specifically, the y value corresponding to the above input operating point is the ordinate p6 of the intersection of curve 5 and x = 0 y , and p6 y = b5; finally, for p6 y , sequentially search in the table S1 for the coordinate value pairs corresponding to the y values that are respectively greater than and less than itself, and obtain its mapping value on the y0 axis by interpolation, denoted as p6 y0 = 0.24, that is, the radiation loss percentage L R,ABMA = 0.24 of the input operating point in the ABMA radiation loss standard curve.

[0098] And in Figure 3- In the wind speed & temperature difference correction curve, an appropriate number of coordinate points are taken on each curve and fitted into a third-order polynomial (target correction curve). It can be understood that the number of coordinate points selected on the wind speed & temperature difference correction curve can be 8 or 12. Specifically, it is not limited here. Preferably, this number should be greater than 11. The wind speed (v) on the boiler surface and the temperature difference (Δt) between the boiler surface and the environment can be measured through on-site tests. Specifically, the temperature difference Δt = 71°F and the wind speed v = 8.5 feet per second. According to this wind speed, the first correction curve and the second correction curve can be determined in the target correction curve. Specifically, based on v, the curves on both sides of it are respectively the first correction curve f l and the second correction curve f u , and the corresponding wind speeds are v l = 5 feet per second and v u = 10 feet per second.

[0099] Then the calculation method of the emissivity corresponding to (Δt, v) is E Δt,v = f l (Δt)+(v - v l ) / (v u - v l )(f u (Δt)-f l (Δt)) = 0.000006 * 71 3 + 0.0025 * 71 2 + 3.2792 * 71+(8.5 - 5) / (10 - 5)*(0.000004 * 71 3 + 0.0019 * 71 2 + 4.5926 * 71-(0.000006 * 71 3 + 0.0025 * 71 2 + 3.2792 * 71)) = 310.2 British thermal units per square foot per hour. Among them, E Δt,v is the emissivity, f l (Δt) is the first correction curve with the temperature difference as the independent variable, and f u (Δt) is the second correction curve with the temperature difference as the independent variable. Further, according to E Δt,v and the ABMA specified conditions (the emissivity at 50°F and 100 feet per second is equal to 125 British thermal units per square foot per hour), the target correction coefficient Coef = E Δt,v / 125 = 310.2 / 125 = 2.48. Finally, according to the radiation loss value and the target correction coefficient, the radiation and convective heat loss values can be obtained. Specifically, the radiation and convective heat loss values L R = 0.75L R,ABMACoef = 0.75 * 0.24 * 2.48 = 0.447, where 0.75 is the correction factor for the furnace wall layout with water cooling on all four sides. It can be understood that the radiative and convective heat loss values can be expressed as percentages of radiative and convective heat losses.

[0100] In the embodiments of the present application, Figure 2 - In the automatic query of the ABMA radiation loss standard curve, the coordinate mapping method is used to map the non-uniform coordinate system to a new uniform coordinate system. In the uniform coordinate system, operations such as numerical fitting of Curve 3, Curve 4, and Curve 5 and finding the intersection coordinates are realized, and the coordinates obtained in the uniform coordinate system are mapped to the non-uniform coordinate system to realize the calculation of the radiative loss percentage. Figure 3 - In the automatic query of the wind speed & temperature difference correction curve, taking advantage of the relatively uniform interval of the correction curves for 7 different wind speeds in the figure, the interpolation method is used. For any wind speed between the maximum and minimum wind speed curves in the figure, the corresponding radiative rate can be solved, and thus the wind speed & temperature difference correction coefficient can be obtained.

[0101] The embodiments of the present application also provide a boiler report system, as Figure 5 shown, including:

[0102] An acquisition unit 501, configured to acquire the maximum continuous thermal power of the unit, the actual thermal power of the unit, the wind speed on the boiler surface, and the temperature difference between the boiler surface and the environment;

[0103] A first fitting unit 502, configured to fit the ABMA radiation loss standard curve into a first radiation loss curve;

[0104] A first execution unit 503, configured to obtain a second radiation loss curve according to the maximum continuous thermal power of the unit, the actual thermal power of the unit, and the first radiation loss curve;

[0105] A second execution unit 504, configured to obtain a radiation loss value corresponding to the actual thermal power of the unit according to the second radiation loss curve;

[0106] A second fitting unit 505, configured to fit the wind speed & temperature difference correction curve to obtain a target correction curve;

[0107] A third execution unit 506, configured to obtain a target correction coefficient corresponding to the wind speed and the temperature difference according to the wind speed, the temperature difference, and the target correction curve;

[0108] A fourth execution unit 507, configured to obtain the radiative and convective heat loss value according to the radiation loss value and the target correction coefficient.

[0109] The embodiments of the present application also provide a boiler report system, as Figure 6 shown, including:

[0110] A central processing unit 601, a memory 602, an input / output interface 603, a wired or wireless network interface 604, and a power supply 605;

[0111] The memory 602 is a transient storage memory or a persistent storage memory;

[0112] The central processing unit 601 is configured to communicate with the memory 602 and execute instruction operations in the memory 602 to perform the above-described query method.

[0113] Those skilled in the art can clearly understand that for the convenience and brevity of description, the specific working processes of the systems, devices, and units described above can refer to the corresponding processes in the foregoing method embodiments, and will not be elaborated herein.

[0114] In several embodiments provided in the present application, it should be understood that the disclosed systems, devices, and methods can be implemented in other ways. For example, the device embodiments described above are merely illustrative. For example, the division of the units is only a logical function division, and there may be other division methods in actual implementation. For example, multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the displayed or discussed couplings or direct couplings or communication connections to each other can be through some interfaces, and the indirect couplings or communication connections of devices or units can be in electrical, mechanical, or other forms.

[0115] The units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, they may be located in one place, or may be distributed to multiple network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0116] In addition, each functional unit in the various embodiments of the present application can be integrated in one processing unit, or each unit can exist physically alone, or two or more units can be integrated in one unit. The above-mentioned integrated units can be implemented in the form of hardware or in the form of software functional units.

[0117] When the integrated unit is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of this application, in essence, or the part that contributes to the prior art, or all or part of this technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to execute all or part of the steps of the methods described in various embodiments of this application. The aforementioned storage medium includes: various media that can store program codes, such as USB flash drives, mobile hard disks, read-only memories (ROM, read-only memory), random access memories (RAM, random access memory), magnetic disks, or optical discs.

Claims

1. A method for querying radiative and convective heat loss values, applied to a boiler reporting system, the boiler reporting system comprising: ABMA radiation loss standard curve and wind speed & temperature difference correction curve, characterized in that the method includes: Obtain the maximum continuous thermal power of the unit and the actual thermal power of the unit 、 The wind speed on the boiler surface and the temperature difference between the boiler surface and the environment; Fitting the ABMA radiation loss standard curve into a first radiation loss curve; Obtaining a second radiation loss curve according to the maximum continuous thermal power of the unit, the actual thermal power of the unit and the first radiation loss curve; Obtaining a radiation loss value corresponding to the actual thermal power of the unit according to the second radiation loss curve; Fitting the wind speed & temperature difference correction curve to obtain a target correction curve; Obtaining a target correction coefficient corresponding to the wind speed and the temperature difference according to the wind speed, the temperature difference and the target correction curve; Obtaining the radiation and convective heat loss value according to the radiation loss value and the target correction coefficient; The ABMA radiation loss standard curve includes: a radiation loss curve under the maximum continuous thermal power, a radiation loss line corresponding to the maximum continuous thermal power, and a water-cooled furnace wall number scale correction curve; The step of fitting the ABMA radiation loss standard curve into a first radiation loss curve includes: Fitting multiple coordinate points corresponding to the radiation loss curve under the maximum continuous thermal power into a first polynomial curve; Fitting multiple coordinate points corresponding to the radiation loss line corresponding to the maximum continuous thermal power into a second polynomial curve; Fitting multiple coordinate points corresponding to the water-cooled furnace wall number scale correction curve into a third polynomial curve, and the first radiation loss curve includes the first polynomial curve, the second polynomial curve and the third polynomial curve; The method further includes: Discretizing the non-uniform coordinate system in the ABMA radiation loss standard curve into a uniform coordinate system; The step of obtaining a second radiation loss curve according to the maximum continuous thermal power of the unit, the actual thermal power of the unit and the first radiation loss curve includes: Arranging the coordinate value pairs of the non-uniform coordinate system and the uniform coordinate system in sequence to obtain a coordinate value combination; Determining a first mapping value corresponding to the maximum continuous thermal power of the unit on the x-axis of the uniform coordinate system according to the maximum continuous thermal power of the unit and the coordinate value combination; Inputting the first mapping value into the first polynomial curve to obtain a first ordinate value; Updating the second polynomial curve according to the first mapping value and the first ordinate value; Determining a second mapping value corresponding to the actual thermal power of the unit on the x-axis of the uniform coordinate system according to the actual thermal power of the unit and the coordinate value combination; Inputting the second mapping value into the updated second polynomial curve to obtain a second ordinate value; Updating the third polynomial curve according to the second ordinate value, and taking the updated third polynomial curve as the second radiation loss curve; The step of obtaining a target correction coefficient corresponding to the wind speed and the temperature difference according to the wind speed, the temperature difference and the target correction curve includes: Determining a first correction curve and a second correction curve in the target correction curve according to the wind speed, wherein the wind speeds corresponding to the first correction curve and the second correction curve are respectively on both sides of the wind speed; Through the formula E Δt,v = f l (Δt)+(v - v l ) / (v u - v l )( f u (Δt)- f l (Δt)), the emissivity corresponding to the wind speed and the temperature difference is obtained; wherein, the E Δt,v is the emissivity, the f l (Δt) is the first correction curve with the temperature difference as the independent variable, the v is the temperature difference, the v l is the wind speed corresponding to the first correction curve, the v u is the wind speed corresponding to the second correction curve, and the f u (Δt) is the second correction curve with the temperature difference as the independent variable; The target correction coefficient is obtained through the formula Coef = E Δt,v / 125; Among them, the Coef is the target correction coefficient, and the E Δt,v is the emissivity.

2. The method according to claim 1, characterized in that, The step of fitting the ABMA radiation loss standard curve into a first radiation loss curve includes: Obtain multiple coordinate points corresponding to the ABMA radiation loss standard curve on the uniform coordinate system; Fit the multiple coordinate points into the first radiation loss curve.

3. The method according to claim 1, characterized in that, The obtaining the radiation loss value corresponding to the actual thermal power of the unit according to the second radiation loss curve includes: Obtain the third ordinate value according to the intersection point of the second radiation loss curve and the y-axis in the uniform coordinate system; According to the third ordinate value and the coordinate value combination, determine the third mapping value corresponding to the third ordinate value on the non-uniform coordinate system, and use the third mapping value as the radiation loss value corresponding to the actual thermal power of the unit.

4. The method according to claim 1, wherein The obtaining the maximum continuous thermal power of the unit and the actual thermal power of the unit includes: Obtain the maximum continuous heat power of the unit through the formula Q BMCR = m coal Q net,ar E f ​ wherein, the m coal is the designed coal consumption at the maximum output of the boiler, the Q net,ar is the lower calorific value of the designed coal type, the E f is the designed efficiency of the boiler, and the Q BMCR is the maximum continuous heat power of the unit; Obtain the actual thermal power of the unit through the formula Q r =Q BMCR D gr,real / D gr whereby the actual thermal power of the unit is obtained; Among them, the Q BMCR is the maximum continuous thermal power of the unit, the D gr is the main steam flow rate of the maximum output of the boiler, the D gr,real is the main steam flow rate of the actual output of the boiler, and the Q r is the actual thermal power of the unit.

5. The method according to claim 1, characterized in that The radiation loss value and the target correction coefficient to obtain the radiation and convective heat loss value includes: Through the formula L R = 0.75L R,ABMA The radiative and convective heat loss values are obtained by Coef; wherein, the L R is the radiative and convective heat loss value, the L R,ABMA is the radiative loss value, the Coef is the target correction coefficient, and the 0.75 is the correction coefficient for the boiler furnace wall arrangement being water-cooled on all four sides.

6. A boiler reporting system, characterized in that, The boiler reporting system includes: the ABMA radiation loss standard curve and the wind speed & temperature difference correction curve, and the boiler reporting system includes: An acquisition unit for acquiring the maximum continuous thermal power of the unit, the actual thermal power of the unit, the wind speed on the boiler surface, and the temperature difference between the boiler surface and the environment; A first fitting unit for fitting the ABMA radiation loss standard curve into the first radiation loss curve; A first execution unit for obtaining the second radiation loss curve according to the maximum continuous thermal power of the unit, the actual thermal power of the unit, and the first radiation loss curve; A second execution unit for obtaining the radiation loss value corresponding to the actual thermal power of the unit according to the second radiation loss curve; A second fitting unit for fitting the wind speed & temperature difference correction curve to obtain the target correction curve; A third execution unit for obtaining the target correction coefficient corresponding to the wind speed and the temperature difference according to the wind speed, the temperature difference, and the target correction curve; A fourth execution unit for obtaining the radiation and convective heat loss value according to the radiation loss value and the target correction coefficient; The ABMA radiation loss standard curve includes: the radiation loss curve at the maximum continuous thermal power, the radiation loss line corresponding to the maximum continuous thermal power, and the water-cooled furnace wall number scale correction curve; The first fitting unit is specifically used for fitting the multiple coordinate points corresponding to the radiation loss curve at the maximum continuous thermal power into the first polynomial curve; fitting the multiple coordinate points corresponding to the radiation loss line corresponding to the maximum continuous thermal power into the second polynomial curve; fitting the multiple coordinate points corresponding to the water-cooled furnace wall number scale correction curve into the third polynomial curve, and the first radiation loss curve includes the first polynomial curve, the second polynomial curve, and the third polynomial curve, and the first radiation loss curve includes the first polynomial curve, the second polynomial curve, and the third polynomial curve; The first execution unit is specifically configured to: discretize the non-uniform coordinate system in the ABMA radiation loss standard curve into a uniform coordinate system; arrange the coordinate value pairs of the non-uniform coordinate system and the uniform coordinate system in sequence to obtain a coordinate value combination; determine a first mapping value corresponding to the maximum continuous thermal power of the unit on the x-axis of the uniform coordinate system according to the maximum continuous thermal power of the unit and the coordinate value combination; input the first mapping value into the first polynomial curve to obtain a first ordinate value; update the second polynomial curve according to the first mapping value and the first ordinate value; determine a second mapping value corresponding to the actual thermal power of the unit on the x-axis of the uniform coordinate system according to the actual thermal power of the unit and the coordinate value combination; input the second mapping value into the updated second polynomial curve to obtain a second ordinate value; update the third polynomial curve according to the second ordinate value, and use the updated third polynomial curve as the second radiation loss curve. The third execution unit is specifically configured to determine a first correction curve and a second correction curve in the target correction curve according to the wind speed, where the wind speeds corresponding to the first correction curve and the second correction curve are respectively on both sides of the wind speed; through the formula E Δt,v = f l (Δt)+(v - v l ) / (v u - v l )( f u (Δt)- f l (Δt)) to obtain the emissivity corresponding to the wind speed and the temperature difference; where the E Δt,v is the emissivity, the f l (Δt) is the first correction curve with the temperature difference as the independent variable, the v is the temperature difference, the v l is the wind speed corresponding to the first correction curve, the v u is the wind speed corresponding to the second correction curve, and the f u (Δt) is the second correction curve with the temperature difference as the independent variable; through the formula Coef = E Δt,v / 125 to obtain the target correction coefficient; where the Coef is the target correction coefficient and the E Δt,v is the emissivity.

7. A boiler reporting system, characterized in that, Comprising: a central processing unit, a memory, an input / output interface, a wired or wireless network interface, and a power supply; The memory is a transient storage memory or a persistent storage memory; The central processing unit is configured to communicate with the memory and execute the instruction operations in the memory to execute the method according to any one of claims 1 to 5.

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