Method for calculating heat absorption nonuniform coefficient of high-temperature heating surface of boiler based on monitoring data

Abstract

The invention discloses a boiler high-temperature heating surface heat absorption non-uniform coefficient calculation method based on monitoring data, relates to the field of heat absorption non-uniform coefficient calculation, and solves the problem that the boiler high-temperature heating surface heat absorption non-uniform coefficient cannot be accurately calculated. According to real-time monitoring data, steam parameters at inlets and outlets of the same tube rings in different tube panels are calculated, and mass flow rates of steam at inlets of distribution headers and outlets of collection headers on the heating surfaces are calculated; according to the steam enthalpy value and the steam specific volume at the inlet and the outlet, the enthalpy increase, the enthalpy increase deviation and the average specific volume of the steam in the same pipe ring in different pipe panels are calculated, the static pressure difference at the inlet and the outlet of the same pipe ring in different pipe panels is calculated, and the steam flow deviation in the same pipe ring in different pipe panels is calculated; and according to the steam flow deviation and the steam enthalpy increase deviation, the heat absorption non-uniform coefficient of the same tube coil in different tube panels is calculated. According to the method, accurate calculation of the heat absorption non-uniform coefficient of the high-temperature heating surface of the boiler is achieved.

Description

TECHNICAL FIELD

[0001] The application belongs to the field of heat absorption unevenness coefficient calculation, and particularly relates to a method for calculating heat absorption unevenness coefficient of high-temperature heating surface of a boiler based on monitoring data. BACKGROUND

[0002] In a П-type boiler, the width direction (i.e. left-right direction) above the furnace and in the horizontal flue is generally provided with a rear screen superheater, a high-temperature (final-stage) superheater, a high-temperature (final-stage) reheater and other screen-type high-temperature heating surfaces. Due to factors such as combustion mode, fuel, burner input mode and furnace type, there is a large unevenness in the distribution of flue gas temperature and flue gas velocity along the width direction of the furnace, and this unevenness will also continue to some extent in the convection flue; In existing literature, the calculation of heat absorption unevenness coefficient of the high-temperature heating surface of a boiler is less, and is usually obtained according to numerical simulation or debugging test data. Both of these two methods are relatively complex, the accuracy of the former depends on the accuracy of modeling, and the latter is time-consuming and laborious and cannot achieve online monitoring. At the same time, in the technical documents of some boiler manufacturers, the maximum heat absorption unevenness coefficient is often directly given, for example, the technical document of a certain boiler manufacturer indicates that the heat load unevenness coefficient of the furnace outlet of a four-corner tangential boiler is generally controlled below 1.4, but in actual operation, it may reach 1.5 to 1.6 due to residual rotation of the gas flow. This directly quoted method does not take into account the actual combustion and operation of the boiler, and is only suitable for rough estimation; Therefore, the application provides a method for calculating heat absorption unevenness coefficient of high-temperature heating surface of a boiler based on monitoring data. SUMMARY

[0003] The application aims to provide a method for calculating heat absorption unevenness coefficient of high-temperature heating surface of a boiler based on monitoring data, so as to solve the problem that the heat absorption unevenness coefficient of high-temperature heating surface of a boiler cannot be accurately calculated.

[0004] The object of the application can be achieved by the following technical solutions. The method for calculating heat absorption unevenness coefficient of high-temperature heating surface of a boiler based on monitoring data comprises the following steps. Step S1: obtaining real-time monitoring data of the boiler; Step S2: calculating steam parameters at the inlet and outlet of the same tube ring in different tube screens according to the real-time monitoring data of the boiler; Step S3: calculating mass flow rates of steam at the inlet of the heating surface distribution header and at the outlet of the collection header; Step S4: calculating enthalpy increase, enthalpy increase deviation and average specific volume of steam in the same tube ring in different tube screens according to the enthalpy values and specific volumes of steam at the inlet and outlet; Step S5, calculating the static pressure difference at the inlet and outlet of the same tube ring in different tube panels; Step S6, calculating the steam flow deviation in the same tube ring in different tube panels; Step S7, calculating the heat absorption unevenness coefficient of the same tube ring in different tube panels according to the steam flow deviation and the enthalpy increase deviation of the steam.

[0005] Further, the real-time monitoring data in step S1 includes the total steam flow F, the steam pressure Pj at the inlet of the distribution header, the steam pressure Pc at the outlet of the collection header, the steam temperature tzj at the left inlet of the distribution header, the steam temperature tyj at the right inlet of the distribution header, and the wall temperature tb above the ceiling at the outlet of the same tube ring in different tube panels. i .

[0006] Further, the steam parameters in step S2 are the pressure and steam temperature at the inlet and outlet of the same tube ring in different tube panels.

[0007] Further, the calculation process in step S2 includes the following sub-steps: Step S21, obtaining the total number of tube panels N in the width direction of the boiler heating surface and the number of tube rings of a single tube panel; Obtaining the steam temperature tzj at the left inlet of the distribution header and the steam temperature tyj at the right inlet of the distribution header, and calculating the steam temperature tj at the inlet of the same tube ring in different tube panels by the formula tj i = tzj - (tzj - tyj) × (i-1) / (N-1) i , i is the left tube panel serial number; Step S22, obtaining the wall temperature tb above the ceiling at the outlet of the same tube ring in different tube panels i , and calculating the steam temperature tc i at the outlet of the same tube ring in different tube panels by the formula tc i ≈ tb i +1 Step S23, obtaining the steam pressure Pj at the inlet of the distribution header, and calculating the pressure Pj at the inlet of the same tube ring in different tube panels by the formula Pj i ≈ Pj i ; Step S24, obtaining the steam pressure Pc at the outlet of the collection header, and calculating the pressure Pc at the outlet of the same tube ring in different tube panels by the formula Pc i ≈ Pc i .

[0008] Further, the calculation process in step S3 is as follows: Step S31, collecting the inner diameter Dj of the distribution header and the inner diameter Dc of the collection header, and obtaining the total steam flow F; Step S32, the mass flow rate fj of the steam at the inlet of the distribution header is calculated by the formula f = 2F / (Π x Dj 2 , wherein Π is the circular constant; Step S33, the mass flow rate fc of the steam at the outlet of the collection header is calculated by the formula fc=2F / (Π x Dc 2 .

[0009] Further, the calculation process in step S4 is as follows: Step S41, the steam enthalpy Hj at the inlet of the same tube ring in different tube panels is calculated by the formula Hj i = (a1 x Pj 2 + a2 x Pj + a3) ln(tj i - (b1 x Pj 2 + b2 x Pj + b3) i , and the steam enthalpy Hc at the outlet of the same tube ring in different tube panels is calculated by the formula Hc i = (a1 x Pc 2 + a2 x Pc + a3) ln(tc i - (b1 x Pc 2 + b2 x Pc + b3) i , wherein a1, a2, a3, b1, b2 and b3 are coefficients. Step S42, the enthalpy increment AH of the steam in the same tube ring in different tube panels is obtained by subtracting the steam enthalpy at the inlet from the steam enthalpy at the outlet i . Step S43, the enthalpy increment deviation HZP of the steam in the same tube ring in different tube panels is calculated by the formula . i ; Step S44, the steam specific volume vj at the inlet of the same tube ring in different tube panels is calculated by the formula vj i = [e1 x (Pj / 100) 2 + e2 x (Pj / 100) + e3] ln(tj i - [d1 x (Pj / 100) 2 + d2 x (Pj / 100) + d3] i , and the steam specific volume vc at the outlet of the same tube ring in different tube panels is calculated by the formula vc i = [e1 x (Pc / 100) 2 + e2 x (Pc / 100) + e3] ln(tc i - [d1 x (Pc / 100) 2 + d2 x (Pc / 100) + d3] iwherein d1, d2, d3, e1, e2 and e3 are coefficients; Step S45, the average specific volume v of the steam in the same tube ring in different tube panels is obtained by adding and averaging the specific volume of the steam at the inlet and the specific volume of the steam at the outlet i .

[0010] Further, the calculation process of the pressure difference at the inlet and outlet of the same tube ring in different tube panels in the step S5 includes the following sub-steps: Step S51, the average specific volume vj of the steam at the inlet of the distribution header is calculated by the formula Step S51, the average specific volume vj of the steam at the inlet of the distribution header is calculated by the formula Similarly, the average specific volume vc of the steam at the outlet of the collection header is calculated by the formula Similarly, the average specific volume vc of the steam at the outlet of the collection header is calculated by the formula Step S52, the steam flow rate wj at the inlet of the distribution header is calculated by the formula wj=vj×fj, and similarly, the steam flow rate wc at the outlet of the collection header is calculated by the formula wc=vc×fc.

[0011] Further, the calculation process of the pressure difference at the inlet and outlet of the same tube ring in different tube panels in the step S5 includes the following sub-steps: Step S53, the maximum static pressure difference △Pjmax at the inlet of the distribution header is calculated by the formula △Pjmax=kj×(wj 2 / 2vj); Similarly, the maximum static pressure difference △Pcmax at the outlet of the collection header is calculated by the formula △Pcmax=kc×(wc 2 / 2vc); wherein kj is the pressure variation coefficient of the distribution header, and kc is the pressure variation coefficient of the collection header. Step S54, the static pressure difference △P i =Pj-Pc+(△Pcmax-△Pjmax)×4(i-1)×(i-N) / (N-1) 2 at the inlet and outlet of the same tube ring in different tube panels is calculated by the formula i .

[0012] Further, the calculation process in the step S6 is as follows: The steam flow deviation LLP i in the same tube ring in different tube panels is calculated by the formula The steam flow deviation LLP i in the same tube ring in different tube panels is calculated by the formula

[0013] Further, the calculation process in the step S7 is as follows: The heat absorption unevenness coefficient Q i of the same tube ring in different tube panels is calculated by the formula Q i =LLP i ×HZPi .

[0014] In summary, due to the adoption of the technical scheme, the present application has the following advantages: 1. The present application firstly acquires the real-time monitoring data of the boiler, and then calculates the steam parameters at the inlet and outlet of the same tube ring in different tube panels by using the real-time monitoring data of the boiler, and then calculates the mass flow rate of the steam at the inlet of the distribution header and the outlet of the collection header, so that the mass flow rate of the steam at the inlet of the distribution header and the outlet of the collection header is calculated. 2. The present application also calculates the enthalpy increase, enthalpy increase deviation and average specific volume of the steam in the same tube ring in different tube panels according to the enthalpy value and specific volume of the steam at the inlet and outlet, and then calculates the static pressure difference at the inlet and outlet of the same tube ring in different tube panels, calculates the steam flow deviation in the same tube ring in different tube panels, and finally calculates the heat absorption unevenness coefficient of the same tube ring in different tube panels by using the steam flow deviation and the enthalpy increase deviation, so that the heat absorption unevenness coefficient of the high-temperature heating surface of the boiler is accurately calculated. BRIEF DESCRIPTION OF DRAWINGS

[0015] In order to facilitate the understanding of those skilled in the art, the present application will be further described below in conjunction with the drawings.

[0016] Figure 1 The present application is a method flowchart. Figure 2 The present application is a schematic diagram of the tube panel structure. Figure 3 The present application is a schematic diagram of the steam flow. Figure 4 The present application is a schematic diagram of the pressure difference at different positions in the left and right directions of the header. Figure 5 The present application is a distribution diagram of the heat absorption unevenness coefficient in the width direction of the boiler. Figure 6 The present application is a schematic diagram of the structure of the electronic device. DETAILED DESCRIPTION

[0017] The technical solutions of the present application will be described below in conjunction with the embodiments. Obviously, the described embodiments are only a part of the embodiments of the present application, not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor are within the scope of protection of the present application.

[0018] Embodiment one: please refer to Figures 1-5As shown, the technical scheme provided by the present application is: a boiler high-temperature heating surface heat absorption uneven coefficient calculation method based on monitoring data. In this embodiment, the calculation of the rear screen heating surface heat absorption uneven coefficient of a boiler of HG-2038 / 26.15-YM3 type in a power plant is taken as an example, and the method is as follows: Step S1, obtaining real-time monitoring data of the boiler; Specifically, please refer to Figure 2 and Figure 3 As shown, the boiler is composed of a distribution header, a collection header, a tube screen, a tube ring, and a ceiling. The real-time monitoring data includes the total steam flow F, the steam pressure Pj at the inlet of the distribution header, the steam pressure Pc at the outlet of the collection header, the steam temperature tzj at the left inlet of the distribution header, the steam temperature tyj at the right inlet of the distribution header, and the wall temperature tb above the outlet of the same tube ring in different tube screens i ; In this embodiment, the real-time monitoring data of the boiler can be obtained from the SIS system (safety instrument system). For example, the real-time monitoring data of the boiler on August 22, 2024, at 19:51 is shown in Table 1, and Table 1 is as follows: It should be explained that in this embodiment, the wall temperature measuring point is installed on the outlet segment above the 6th ring of each tube screen from outside to inside, and i is the serial number of the corresponding tube screen from left to right.

[0019] Step S2, calculating the steam parameters at the inlet and outlet of the same tube ring in different tube screens according to the real-time monitoring data of the boiler; Among them, the steam parameters are the pressure and steam temperature at the inlet of the same tube ring in different tube screens and the pressure and steam temperature at the outlet; In this embodiment, the calculation process in step S2 includes the following sub-steps: Step S21, obtaining the total number of tube screens N in the width direction of the boiler heating surface and the number of tube rings of a single tube screen. In this embodiment, the total number of tube screens in the width direction of the boiler heating surface is 35 screens, and a single tube screen has 18 tube rings. Obtaining the steam temperature tzj at the left inlet of the distribution header and the steam temperature tyj at the right inlet of the distribution header, and calculating the steam temperature tj at the inlet of the same tube ring in different tube screens by the formula tj i =tzj-(tzj-tyj)×(i-1) / (N-1) i , i is the serial number of the tube screen from left to right; It should be explained that the steam in the distribution header enters from the desuperheater pipes on both sides of the distribution header. Due to the adjustment of the desuperheater water, the inlet steam temperature on both sides may differ greatly, resulting in a temperature gradient in different positions in the left and right directions. Step S22: Obtain the wall temperature tb above the ceiling at the same tube ring outlet in different tube panels i , through the formula tc i ≈tb i +1Calculate the steam temperature tc at the outlet of the same tube ring in different tube panels i ; It should be explained that the outlet wall temperature measurement point is located in the large cover above the ceiling. This pipe section is wrapped with thick insulation. According to heat transfer calculations, the steam temperature exceeds the wall temperature by within 1°C. Step S23, obtain the steam pressure Pj at the inlet of the distribution header, and use the formula Pj i ≈Pj to calculate the pressure Pj at the inlet of the same tube ring in different tube panels i ; Step S24, obtain the steam pressure Pc at the outlet of the collecting header, and use the formula Pc i ≈PcCalculate the pressure Pc at the outlet of the same tube ring in different tube panels i For example, the calculation results of steam parameters at the inlet and outlet of the same tube coil of different tube panels are shown in Table 2. The details of Table 2 are as follows: It should be explained that, in theory, the static pressure at each position in the header is different, but this difference is only on the order of one thousandth of the average pressure, which is not enough to cause a significant change in the enthalpy and specific volume, so it is treated as an approximation here.

[0020] Step S3, calculating the mass flow rate of steam at the inlet of the heating surface distribution header and the outlet of the collection header; The calculation process in step S3 is as follows: Step S31, collecting the inner diameter Dj of the distribution header and the inner diameter Dc of the collection header to obtain the total steam flow F; Step S32, by the formula fj=2F / (Π×Dj 2 ) Calculate the mass flow rate fj of steam at the distribution header inlet, where Π is the pi coefficient, Π≈3.1415926; Step S33, by the formula fc=2F / (Π×Dc 2 ) calculates the mass flow rate fc of the steam at the outlet of the collecting header; illustratively, the calculation results of the mass flow rate of the steam at the inlet of the distribution header and the outlet of the collecting header are shown in Table 3, which is as follows: Step S4, calculating the enthalpy increase, enthalpy increase deviation, and average specific volume of steam in the same tube coil in different tube panels based on the steam enthalpy values ​​and steam specific volumes at the inlet and outlet; Specifically, the calculation process in step S4 is as follows: Step S41, the steam enthalpy Hj at the inlet of the same tube ring in different tube panels is calculated by formula Hj i = (a1 x Pj 2 + a2 x Pj + a3) ln(tj i - (b1 x Pj 2 + b2 x Pj + b3) i Similarly, the steam enthalpy Hc at the outlet of the same tube ring in different tube panels is calculated by formula Hc i = (a1 x Pc 2 + a2 x Pc + a3) ln(tc i - (b1 x Pc 2 + b2 x Pc + b3) i Wherein, a1, a2, a3, b1, b2 and b3 are coefficients. Step S42, the steam enthalpy at the outlet is subtracted from the steam enthalpy at the inlet to obtain the enthalpy increase △H of the steam in the same tube ring in different tube panels i ; Step S43, the enthalpy increase deviation HZP of the steam in the same tube ring in different tube panels is calculated by formula i ; Step S44, the steam specific volume vj at the inlet of the same tube ring in different tube panels is calculated by formula vj i = [e1 x (Pj / 100) 2 + e2 x (Pj / 100) + e3] ln(tj i - [d1 x (Pj / 100) 2 + d2 x (Pj / 100) + d3] i Similarly, the steam specific volume vc at the outlet of the same tube ring in different tube panels is calculated by formula vc i = [e1 x (Pc / 100) 2 + e2 x (Pc / 100) + e3] ln(tc i - [d1 x (Pc / 100) 2 + d2 x (Pc / 100) + d3] i Wherein, d1, d2, d3, e1, e2 and e3 are coefficients. Step S45, the steam specific volume at the inlet and the steam specific volume at the outlet are added and averaged to obtain the average specific volume v of the steam in the same tube ring in different tube panels i ; For example, the calculation results of the enthalpy increase of the steam, the enthalpy increase deviation of the steam and the average specific volume of the steam in the same tube ring in different tube panels are shown in Table 4, and Table 4 is as follows: ​ In this embodiment, the value of a1 is 0.5581, the value of a2 is 8.6019, the value of a3 is 1283.9, the value of b1 is 3.6182, the value of b2 is 62.84, the value of b3 is 4494, the value of e1 is 0.4927, the value of e2 is 0.2606, the value of e3 is 0.0512, the value of d1 is 2.4001, the value of d2 is 1.2537, and the value of d3 is 0.2573.

[0021] Step S5, calculating the static pressure difference at the inlet and outlet of the same tube coil in different tube panels; The process of calculating the pressure difference at the inlet and outlet of the same tube coil in different tube panels in step S5 includes the following sub-steps: Step S51, firstly, by formula Calculate the average specific volume vj of steam at the inlet of the distribution header; Similarly, through the formula Calculate the average specific volume vc of steam at the outlet of the collecting header; Step S52, see Figure 4 As shown, the steam flow rate wj at the inlet of the distribution header is calculated by the formula wj=vj×fj. Similarly, the steam flow rate wc at the outlet of the collection header is calculated by the formula wc=vc×fc. Step S53, by the formula △Pjmax=kj×(wj 2 / 2vj) to calculate the maximum static pressure difference △Pjmax at the inlet of the distribution header; Similarly, through the formula △Pcmax=kc×(wc 2 / 2vc) to calculate the maximum static pressure difference △Pcmax at the outlet of the collecting header; Wherein, kj is the distribution header pressure variation coefficient, kc is the collection header pressure variation coefficient; for example, the value of kj is 0.75, and the value of kc is 2; Step S54, by formula △P i =Pj-Pc+(△Pcmax-△Pjmax)×4(i-1)×(iN) / (N-1) 2 The static pressure difference △P at the inlet and outlet of the same tube ring in different tube panels is calculated i ; For example, the calculation results of the static pressure difference at the inlet and outlet of the same tube ring in different tube panels are shown in Table 5. The details of Table 5 are as follows: It should be explained that the static pressure in the left and right directions of the header is parabolic distribution, and it is necessary to first calculate the maximum static pressure difference △Pjmax at the inlet of the distribution header and the maximum static pressure difference △Pcmax at the outlet of the collection header.

[0022] Step S6, the steam flow deviation in the same tube ring in different tube panels is calculated, specifically: The steam flow deviation in the same tube ring in different tube panels is calculated by the formula LLP i ; The calculation results of the steam flow deviation in the same tube ring in different tube panels are shown in the column of 'flow deviation'.

[0023] Step S7, the heat absorption uneven coefficient of the same tube ring in different tube panels is calculated according to the steam flow deviation and the enthalpy increase deviation of the steam; The heat absorption uneven coefficient of the same tube ring in different tube panels is calculated by the formula Q i =LLP i ×HZP i . i ; The calculation results of the heat absorption uneven coefficient of the same tube ring in different tube panels are shown in the column of 'heat absorption uneven coefficient', and the distribution diagram of the heat absorption uneven coefficient in the width direction of the boiler is shown in Figure 5 .

[0024] In the present application, if the corresponding calculation formula appears, the above calculation formula is all de-dimensioned to calculate the numerical value, and the weight coefficient, proportional coefficient and other coefficients existing in the formula are set to a size to quantify the result value of each parameter. The size of the weight coefficient and the proportional coefficient can only affect the proportional relationship between the parameters and the result value.

[0025] Example Two: Figure 6 A structural diagram of an electronic device, which can include: a processor, a communications interface, a memory and a communication bus, wherein the processor, the communications interface, the memory complete the communication among each other through the communication bus. The processor can call the logic instructions in the memory to execute the boiler high-temperature heating surface heat absorption uneven coefficient calculation method based on monitoring data, which includes: obtaining the real-time monitoring data of the boiler, calculating the steam parameters at the inlet and outlet of the same tube ring in different tube panels according to the real-time monitoring data of the boiler, calculating the mass flow rate of the steam at the inlet of the heating surface distribution header and the outlet of the collection header, calculating the enthalpy increase, enthalpy increase deviation and average specific volume of the steam in the same tube ring in different tube panels according to the steam enthalpy value and steam specific volume at the inlet and outlet, calculating the static pressure difference at the inlet and outlet of the same tube ring in different tube panels, calculating the steam flow deviation in the same tube ring in different tube panels, and calculating the heat absorption uneven coefficient of the same tube ring in different tube panels according to the steam flow deviation and the enthalpy increase deviation of the steam.

[0026] Further, the logic instructions in the memory of the above-mentioned storage medium can be realized in the form of software function units and sold or used as an independent product, which can be stored in a computer readable storage medium. Based on such understanding, the technical solutions of the present application essentially or the parts of the prior art that make contributions or parts of the technical solutions can be embodied in the form of a software product. The computer software product is stored in a storage medium, and includes a plurality of instructions for causing a computer device (which can be a personal computer, a server, or a network device, etc.) to execute all or part of the steps of the methods described in the various embodiments of the present application. The aforementioned storage medium includes: a U disk, a mobile hard disk, a read-only memory (ROM, Read-Only Memory), a random access memory (RAM, Random Access Memory), a magnetic disk or an optical disk, and various media that can store program codes.

[0027] In another aspect, the present application also provides a computer program product, which comprises a computer program stored on a computer readable storage medium, and the computer program comprises program instructions, when the program instructions are executed by a computer, the computer can execute the above-mentioned method for calculating the heat absorption unevenness coefficient of the high-temperature heating surface of the boiler based on the monitoring data, which comprises: obtaining real-time monitoring data of the boiler, calculating steam parameters at the inlet and outlet of the same tube ring in different tube panels according to the real-time monitoring data of the boiler, calculating mass flow rates of steam at the inlet of the heating surface distribution header and the outlet of the collection header, calculating enthalpy increase, enthalpy increase deviation and average specific volume of steam in the same tube ring in different tube panels according to the enthalpy value and specific volume of steam at the inlet and outlet, calculating static pressure differences at the inlet and outlet of the same tube ring in different tube panels, calculating steam flow deviation in the same tube ring in different tube panels, and calculating the heat absorption unevenness coefficient of the same tube ring in different tube panels according to the steam flow deviation and the enthalpy increase deviation of steam.

[0028] In another aspect, the present application also provides a computer readable storage medium, which stores a computer program, and the computer program is executed by a processor to implement the above-mentioned method for calculating the heat absorption unevenness coefficient of the high-temperature heating surface of the boiler based on the monitoring data, which comprises: obtaining real-time monitoring data of the boiler, calculating steam parameters at the inlet and outlet of the same tube ring in different tube panels according to the real-time monitoring data of the boiler, calculating mass flow rates of steam at the inlet of the heating surface distribution header and the outlet of the collection header, calculating enthalpy increase, enthalpy increase deviation and average specific volume of steam in the same tube ring in different tube panels according to the enthalpy value and specific volume of steam at the inlet and outlet, calculating static pressure differences at the inlet and outlet of the same tube ring in different tube panels, calculating steam flow deviation in the same tube ring in different tube panels, and calculating the heat absorption unevenness coefficient of the same tube ring in different tube panels according to the steam flow deviation and the enthalpy increase deviation of steam.

[0029] The device embodiments described above are merely illustrative, wherein the units described as separate components can or can not be physically separate, and the components displayed as units can or can not be physical units, i.e., can be located in one place, or can be distributed to multiple network units. Part or all of the modules can be selected to achieve the purposes of the embodiments according to actual needs. Those skilled in the art can understand and implement without creative labor.

[0030] Through the description of the above embodiments, those skilled in the art can clearly understand that the embodiments can be realized by means of software and necessary universal hardware platforms, and of course can also be realized by hardware. Based on such understanding, the above technical solutions can be embodied in the form of software products, and the computer software products can be stored in a computer readable storage medium, such as ROM / RAM, magnetic disk, optical disk, etc., and include a plurality of instructions to make a computer device (which can be a personal computer, a server, or a network device, etc.) execute the methods described in each embodiment or some parts of the embodiments.

[0031] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, and not to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement for part of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A method for calculating the heat absorption unevenness coefficient of a boiler high-temperature heating surface based on monitoring data, characterized in that: include: Step S1, obtaining real-time monitoring data of the boiler; Step S2, calculating steam parameters at the inlet and outlet of the same tube coil in different tube panels based on real-time monitoring data of the boiler; Step S3, calculating the mass flow rate of steam at the inlet of the heating surface distribution header and the outlet of the collection header; Step S4, calculating the enthalpy increase, enthalpy increase deviation, and average specific volume of steam in the same tube coil in different tube panels based on the steam enthalpy values ​​and steam specific volumes at the inlet and outlet; Step S5, calculating the static pressure difference at the inlet and outlet of the same tube coil in different tube panels; Step S6, calculating the steam flow deviation within the same tube coil in different tube panels; Step S7: Calculate the heat absorption non-uniformity coefficient of the same tube coil in different tube panels based on the steam flow deviation and the steam enthalpy increase deviation.

2. The method for calculating the heat absorption non-uniformity coefficient of the boiler high temperature heating surface based on monitoring data according to claim 1, characterized in that: The real-time monitoring data in step S1 include the total steam flow F, the steam pressure Pj at the inlet of the distribution header, the steam pressure Pc at the outlet of the collection header, the steam temperature tzj at the inlet of the left side of the distribution header, the steam temperature tyj at the inlet of the right side of the distribution header, and the wall temperature tb above the ceiling at the outlet of the same tube ring in different tube panels. i .

3. The method for calculating the heat absorption non-uniformity coefficient of the boiler high temperature heating surface based on monitoring data according to claim 2, characterized in that: The steam parameters in step S2 are the pressure and steam temperature at the inlet and the pressure and steam temperature at the outlet of the same tube coil in different tube panels.

4. The method for calculating the heat absorption non-uniformity coefficient of the high-temperature heating surface of a boiler based on monitoring data according to claim 3 is characterized in that: The calculation process in step S2 includes the following sub-steps: Step S21, obtaining the total number N of tube panels in the width direction of the boiler heating surface and the number of tube coils of a single tube panel; Get the steam temperature tzj at the left inlet of the distribution header and the steam temperature tyj at the right inlet of the distribution header, and use the formula tj i =tzj-(tzj-tyj)×(i-1) / (N-1) to calculate the steam temperature tj at the inlet of the same tube ring in different tube panels i , i is the left tube screen number; Step S22: Obtain the wall temperature tb above the ceiling at the same tube ring outlet in different tube panels i , through the formula tc i ≈tb i +1Calculate the steam temperature tc at the outlet of the same tube ring in different tube panels i ; Step S23, obtain the steam pressure Pj at the inlet of the distribution header, and use the formula Pj i ≈Pj to calculate the pressure Pj at the inlet of the same tube ring in different tube panels i ; Step S24, obtain the steam pressure Pc at the outlet of the collecting header, and use the formula Pc i ≈PcCalculate the pressure Pc at the outlet of the same tube ring in different tube panels i .

5. The method for calculating the heat absorption non-uniformity coefficient of the boiler high temperature heating surface based on monitoring data according to claim 4, characterized in that: The calculation process in step S3 is as follows: Step S31, collecting the inner diameter Dj of the distribution header and the inner diameter Dc of the collection header to obtain the total steam flow F; Step S32, by the formula fj=2F / (Π×Dj 2 ) Calculate the mass flow rate fj of steam at the distribution header inlet, where π is the pi coefficient; Step S33, by the formula fc=2F / (Π×Dc 2 ) Calculate the mass flow rate fc of steam at the outlet of the collecting header.

6. The method for calculating the heat absorption non-uniformity coefficient of the high-temperature heating surface of a boiler based on monitoring data according to claim 5, characterized in that: The calculation process in step S4 is as follows: Step S41, by formula Hj i =(a1×Pj 2 +a2×Pj+a3)ln(tj i )-(b1×Pj 2 +b2×Pj+b3) to calculate the steam enthalpy Hj at the inlet of the same tube ring in different tube panels i ; Similarly, through the formula Hc i =(a1×Pc 2 +a2×Pc+a3)ln(tc i )-(b1×Pc 2 +b2×Pc+b3) to calculate the steam enthalpy Hc at the outlet of the same tube ring in different tube panels i , where a1, a2, a3, b1, b2 and b3 are coefficients; Step S42: Subtract the steam enthalpy at the inlet from the steam enthalpy at the outlet to obtain the enthalpy increase ΔH of the steam in the same tube coil in different tube panels. i ; Step S43, by formula Calculate the enthalpy increase deviation HZP of steam in the same tube circle in different tube panels i ; Step S44, by formula vj i =[e1×(Pj / 100) 2 +e2×(Pj / 100)+e3]ln(tj i )-[d1×(Pj / 100) 2 +d2×(Pj / 100)+d3] to obtain the steam specific volume vj at the inlet of the same tube ring in different tube panels i ; Similarly, through the formula vc i =[e1×(Pc / 100) 2 +e2×(Pc / 100)+e3]ln(tc i )-[d1×(Pc / 100) 2 +d2×(Pc / 100)+d3] to calculate the steam specific volume vc at the outlet of the same tube ring in different tube panels i , where d1, d2, d3, e1, e2 and e3 are coefficients; Step S45: Add the steam specific volume at the inlet and the steam specific volume at the outlet, and take the average value to obtain the average specific volume v of steam in the same tube circle in different tube panels. i .

7. The method for calculating the heat absorption non-uniformity coefficient of the high-temperature heating surface of a boiler based on monitoring data according to claim 6, characterized in that: The process of calculating the pressure difference at the inlet and outlet of the same tube coil in different tube panels in step S5 includes the following sub-steps: Step S51, firstly, by formula Calculate the average specific volume vj of steam at the inlet of the distribution header; Similarly, through the formula Calculate the average specific volume vc of steam at the outlet of the collecting header; Step S52: The steam flow rate wj at the inlet of the distribution header is calculated by the formula wj=vj×fj. Similarly, the steam flow rate wc at the outlet of the collection header is calculated by the formula wc=vc×fc.

8. The method for calculating the heat absorption non-uniformity coefficient of the boiler high temperature heating surface based on monitoring data according to claim 7, characterized in that: The process of calculating the pressure difference at the inlet and outlet of the same tube coil in different tube panels in step S5 further includes the following sub-steps: Step S53, by the formula △Pjmax=kj×(wj 2 / 2vj) to calculate the maximum static pressure difference △Pjmax at the inlet of the distribution header; Similarly, through the formula △Pcmax=kc×(wc 2 / 2vc) to calculate the maximum static pressure difference △Pcmax at the outlet of the collecting header; Among them, kj is the distribution header pressure variation coefficient, kc is the collection header pressure variation coefficient; Step S54, by formula △P i =Pj-Pc+(△Pcmax-△Pjmax)×4(i-1)×(iN) / (N-1) 2 The static pressure difference △P at the inlet and outlet of the same tube ring in different tube panels is calculated i .

9. The method for calculating the heat absorption non-uniformity coefficient of the high-temperature heating surface of a boiler based on monitoring data according to claim 8, characterized in that: The calculation process in step S6 is as follows: By formula Calculate the steam flow deviation LLP within the same tube circle in different tube panels i .

10. The method for calculating the heat absorption non-uniformity coefficient of the high-temperature heating surface of a boiler based on monitoring data according to claim 9, characterized in that: The calculation process in step S7 is as follows: By formula Q i =LLP i ×HZP i The heat absorption unevenness coefficient Q of the same tube ring in different tube panels is calculated i .

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