Method, device and apparatus for determining oxygen content at a boiler flue

Abstract

The present disclosure provides a method, device and equipment for determining oxygen content at a flue of a boiler, the method comprising: obtaining pressure differences and oxygen volume fractions at multiple test points at the flue of the target boiler; and determining a target oxygen content at the flue of the target boiler based on the pressure differences and the oxygen volume fractions at the multiple test points. Thus, the target oxygen content at the flue of the target boiler can be effectively determined based on the pressure differences and the oxygen volume fractions at the multiple test points at the flue of the target boiler.

Description

TECHNICAL FIELD

[0001] The present disclosure relates to the technical field of computer technology, and particularly relates to a method, device and equipment for determining oxygen content at a boiler flue. BACKGROUND

[0002] The oxygen content at the boiler flue is one of important monitoring parameters of boiler operation, and is an important basis for reflecting the perfection degree of boiler operation. For example, whether the boiler is in the best combustion state can be judged by monitoring the oxygen content at the boiler flue.

[0003] How to determine the oxygen content at the boiler flue to assist relevant staff in controlling the boiler is very important. SUMMARY

[0004] The present disclosure aims to at least solve one of the technical problems in the related art to some extent.

[0005] The present disclosure provides a method, device and equipment for determining oxygen content at a boiler flue, which can effectively determine the target oxygen content at the flue of the target boiler based on the pressure difference and oxygen volume fraction of multiple test points at the flue of the target boiler.

[0006] The first aspect of the present disclosure provides a method for determining oxygen content at a boiler flue, comprising:

[0007] obtaining the pressure difference and oxygen volume fraction of multiple test points at the flue of the target boiler;

[0008] determining the target oxygen content at the flue of the target boiler based on the pressure difference and oxygen volume fraction of the multiple test points.

[0009] The method for determining oxygen content at the flue of the boiler according to the present disclosure obtains the pressure difference and oxygen volume fraction of multiple test points at the flue of the target boiler, and determines the target oxygen content at the flue of the target boiler based on the pressure difference and oxygen volume fraction of the multiple test points. Thus, the target oxygen content at the flue of the target boiler can be effectively determined based on the pressure difference and oxygen volume fraction of the multiple test points at the flue of the target boiler.

[0010] The second aspect of the present disclosure provides a device for determining oxygen content at a boiler flue, comprising:

[0011] an obtaining module configured to obtain the pressure difference and oxygen volume fraction of multiple test points at the flue of the target boiler;

[0012] a first determining module configured to determine the target oxygen content at the flue of the target boiler based on the pressure difference and oxygen volume fraction of the multiple test points.

[0013] The determination device for oxygen content at the flue of the boiler provided by the embodiment of the present disclosure can obtain the pressure difference and oxygen volume fraction of multiple test points at the flue of the target boiler, and determine the target oxygen content at the flue of the target boiler based on the pressure difference and oxygen volume fraction of the multiple test points. Thus, the target oxygen content at the flue of the target boiler can be effectively determined based on the pressure difference and oxygen volume fraction of the multiple test points at the flue of the target boiler.

[0014] The third aspect of the present disclosure provides an electronic device, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein when the processor executes the program, the method for determining the oxygen content at the flue of the boiler according to the first aspect of the present disclosure is implemented.

[0015] The fourth aspect of the present disclosure provides a non-transitory computer readable storage medium, which stores a computer program executable by a processor to implement the method for determining the oxygen content at the flue of the boiler according to the first aspect of the present disclosure.

[0016] The fifth aspect of the present disclosure provides a computer program product, which comprises instructions executable by a processor to implement the method for determining the oxygen content at the flue of the boiler according to the first aspect of the present disclosure.

[0017] The additional aspects and advantages of the present disclosure will be partially given in the following description, partially become obvious from the following description, or be understood through the practice of the present disclosure. BRIEF DESCRIPTION OF DRAWINGS

[0018] The above and / or additional aspects and advantages of the present disclosure will become apparent and more readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings, in which:

[0019] Figure 1 A flowchart of the method for determining the oxygen content at the flue of the boiler provided by the first embodiment of the present disclosure is shown;

[0020] Figure 2 A schematic diagram of the sampling section with multiple test points provided by the present disclosure is shown;

[0021] Figure 3 A flowchart of the method for determining the oxygen content at the flue of the boiler provided by the second embodiment of the present disclosure is shown;

[0022] Figure 4 A structural schematic diagram of the determination device for oxygen content at the flue of the boiler provided by the third embodiment of the present disclosure is shown;

[0023] Figure 5 A schematic block diagram of an example electronic device that can be used to implement embodiments of the present disclosure is shown. Detailed Implementation

[0024] Embodiments of this disclosure are described in detail below, examples of which are illustrated in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this disclosure, and should not be construed as limiting this disclosure.

[0025] In related technologies, a flue gas analyzer can be used to test the oxygen content at multiple test points in the flue at the tail end of the boiler furnace, and the test results of the oxygen content can be arithmetically averaged to obtain the average oxygen content, which is then used as the oxygen content at the flue.

[0026] However, due to the complex flow path in the flue at the tail end of the boiler furnace, the flue layout has many bends, and the flue gas field has severe backflow and turbulence in some areas, resulting in a large deviation in the oxygen content test results of each test point in the sampling section. If only the arithmetic average method is used to calculate and determine the average oxygen content, the average oxygen content cannot represent the true level of oxygen content in the flue.

[0027] To address the aforementioned issues, this disclosure proposes a method, apparatus, and equipment for determining the oxygen content in a boiler flue.

[0028] The following describes, with reference to the accompanying drawings, a method, apparatus, and equipment for determining the oxygen content in a boiler flue according to embodiments of the present disclosure.

[0029] Figure 1 This is a schematic flowchart illustrating the method for determining the oxygen content in a boiler flue provided in Embodiment 1 of this disclosure.

[0030] This disclosure illustrates by example how the method for determining the oxygen content at the boiler flue is configured in a device for determining the oxygen content at the boiler flue. This device for determining the oxygen content at the boiler flue can be applied to any electronic device so that the electronic device can perform battery management functions.

[0031] Among them, electronic devices can be any device with computing capabilities, such as personal computers (PCs), mobile terminals, servers, etc. Mobile terminals can be hardware devices with various operating systems, touch screens and / or displays, such as mobile phones, tablets, personal digital assistants, wearable devices, etc.

[0032] like Figure 1 As shown, the method for determining the oxygen content in the boiler flue can include the following steps:

[0033] At step 101, the pressure difference and the oxygen volume fraction of multiple test points at the flue of the target boiler are obtained.

[0034] In the embodiments of the present disclosure, the multiple test points can be located in the same sampling section at the tail of the boiler furnace.

[0035] As an example, the sampling section with multiple test points can be as shown in Figure 2 .

[0036] In the embodiments of the present disclosure, the pressure difference of a test point can be the difference between the total pressure and the static pressure of flue gas at the test point.

[0037] In the embodiments of the present disclosure, the oxygen volume fraction of a test point can indicate the percentage of oxygen in flue gas at the test point.

[0038] In the embodiments of the present disclosure, the pressure difference and the oxygen volume fraction of multiple test points at the flue of the target boiler can be obtained, for example, by using a dynamic pressure measuring tube to obtain the pressure difference of multiple test points at the flue of the target boiler, and by using a flue gas analyzer to obtain the oxygen volume fraction of multiple test points at the flue of the target boiler.

[0039] At step 102, the target oxygen content at the flue of the target boiler is determined based on the pressure difference and the oxygen volume fraction of the multiple test points.

[0040] In the embodiments of the present disclosure, the target oxygen content can indicate the average oxygen content of the multiple test points.

[0041] In the embodiments of the present disclosure, the target oxygen content at the flue of the target boiler can be determined based on the pressure difference and the oxygen volume fraction of the multiple test points.

[0042] As a possible implementation manner, for any test point, a first coefficient of the test point can be determined according to the square root of the pressure difference of the test point, a second coefficient of the test point can be determined according to the product of the first coefficient and the oxygen volume fraction at the test point, the first coefficients of the test points are added to obtain a third coefficient, the second coefficients of the test points are added to obtain a fourth coefficient, and the target oxygen content at the flue of the target boiler can be determined according to the ratio of the fourth coefficient to the third coefficient.

[0043] As an example, assuming that the sampling section with multiple test points is as shown in Figure 2 , wherein the test points in the sampling section are distributed in m rows and n columns, for the test point in the i-th row and the j-th column, the first coefficient of the test point is determined according to the square root of the pressure difference Δp ij of the test point. wherein i∈[1, m], j∈[1, n], and i and j are positive integers, and the second coefficient of the test point is determined according to the product of the first coefficient and the oxygen volume fraction φO2ij The product of these factors determines the second coefficient at that test point. The third coefficient can be obtained by summing the first coefficients of m*n test points. The fourth coefficient can be obtained by summing the second coefficients of the m*n test points. The target oxygen content at the flue of the target boiler can be determined by the ratio of the fourth coefficient to the third coefficient.

[0044]

[0045]

[0046] In one possible implementation of this disclosure, when the target oxygen content is greater than a first set threshold, the opening angle of the damper of the target boiler can be reduced, and / or the opening angle of the flue damper can be reduced; when the target oxygen content is less than a second set threshold, the opening angle of the damper of the target boiler can be increased, and / or the opening angle of the flue damper can be increased; wherein, the first set threshold can be greater than or equal to the second set threshold.

[0047] In the embodiments of this disclosure, the first set threshold can be preset, such as 6%, 8%, etc., and this disclosure does not limit it.

[0048] In the embodiments of this disclosure, the second set threshold can be preset, and the second set threshold can be less than or equal to the first set threshold. It should be noted that this disclosure does not limit the value of the second set threshold.

[0049] Understandably, when the oxygen content in the flue is too high, the following hazards may exist:

[0050] 1. CO in the flue gas is prone to secondary combustion in the convection section, which can damage the furnace tubes;

[0051] Second, the surface of the furnace tube is prone to oxidation, which may shorten the life of the furnace tube;

[0052] Third, a large amount of air entering the boiler furnace will increase the temperature of the boiler's convection section, which may shorten the life of the convection section tubes. At the same time, it will increase the flue gas temperature and reduce the boiler's thermal efficiency.

[0053] When the oxygen content in the flue is too low, there may be incomplete combustion of fuel in the boiler, which may result in heat loss due to incomplete combustion.

[0054] Therefore, in the present disclosure, when the target oxygen content is greater than a first set threshold, it indicates that the oxygen content at the flue is too high, the opening angle of the damper of the target boiler can be reduced, and / or the opening angle of the flue baffle can be reduced; when the target oxygen content is less than a second set threshold, it indicates that the oxygen content at the flue is too low, the opening angle of the damper of the target boiler can be increased, and / or the opening angle of the flue baffle can be increased; wherein the first set threshold can be greater than or equal to the second set threshold. Thus, the target oxygen content at the flue can be controlled.

[0055] In another possible implementation manner of the embodiments of the present disclosure, the air leakage rate of the air preheater of the target boiler can be determined according to the target oxygen content; and / or the boiler efficiency of the target boiler can be determined according to the target oxygen content.

[0056] In the embodiments of the present disclosure, the air leakage rate of the air preheater of the target boiler can be determined according to the target oxygen content.

[0057] As a possible implementation manner, based on the target oxygen content at the flue of the target boiler, the inlet oxygen content of the target air preheater connected with the flue of the target boiler is determined, and based on the inlet oxygen content, the inlet excess air coefficient of the target air preheater is determined; the outlet oxygen content of the target air preheater is obtained, and based on the outlet oxygen content, the outlet excess air coefficient of the target air preheater is determined; and according to the inlet excess air coefficient and the outlet excess air coefficient of the target air preheater, the air leakage rate of the target air preheater is determined.

[0058] It should be noted that the target air preheater is a heating surface that preheats the air entering the target boiler to a certain temperature through the fins inside the target air preheater by the flue gas in the tail flue of the target boiler, so the target oxygen content at the flue of the target boiler can be regarded as the inlet oxygen content of the target air preheater.

[0059] As an example, it is assumed that the target oxygen content at the flue of the target boiler is Firstly, the inlet excess air coefficient a of the target air preheater can be determined according to the following formula AH.en.cr :

[0060]

[0061] Secondly, the outlet oxygen content of the target air preheater can be determined by the method of determining the target oxygen content at the flue, and it is assumed that the outlet oxygen content of the target air preheater is The inlet excess air coefficient a of the target air preheater can be determined according to the following formula AH.lv.cr :

[0062]

[0063] Finally, according to the above-mentioned inlet excess air coefficient and outlet excess air coefficient of the target air preheater, the air leakage rate η of the target air preheater can be determined according to the following formula lg.AH :

[0064]

[0065] Therefore, the air leakage rate of the target air preheater can be effectively obtained.

[0066] In the embodiments of the present disclosure, the boiler efficiency of the target boiler can be determined according to the target oxygen content.

[0067] The method for determining the oxygen content at the flue of the boiler provided in the embodiments of the present disclosure comprises the following steps:

[0068] In order to clearly illustrate how the target oxygen content at the flue of the target boiler is determined based on the pressure difference and oxygen volume fraction of the multiple test points in the above-mentioned embodiments of the present disclosure, the present disclosure further provides a method for determining the oxygen content at the flue of a boiler.

[0069] Figure 3 The flowchart of the method for determining the oxygen content at the flue of the boiler provided in Embodiment Two of the present disclosure.

[0070] As shown in the flowchart, the method for determining the oxygen content at the flue of the boiler can comprise the following steps: Figure 3

[0071] Step 301: Obtain the pressure difference and oxygen volume fraction of multiple test points at the flue of the target boiler.

[0072] The execution process of step 301 can refer to the execution process of any embodiment of the present disclosure, which will not be repeated here.

[0073] Step 302: For any test point, obtain the flue gas flow rate at the test point based on the pressure difference of the test point.

[0074] In the case where the pressure difference of the test point is measured by a dynamic pressure measuring tube, as a possible implementation manner, the first flue gas density at the test point can be obtained, and the seventh coefficient of the dynamic pressure measuring tube can be obtained; based on the seventh coefficient of the dynamic pressure measuring tube, the first flue gas density at the test point and the pressure difference, the flue gas flow rate at the test point can be determined.

[0075] ​In the embodiments of the present disclosure, the first flue gas density at the test point can be acquired, wherein the first flue gas density can indicate the flue gas density at the test point.

[0076] As a possible implementation, the flue gas temperature, the atmospheric pressure and the flue gas static pressure at the test point can be acquired; and the second flue gas density at the test point under the standard state can be acquired; based on the second flue gas density and based on the flue gas temperature, the atmospheric pressure and the flue gas static pressure at the test point, the first flue gas density at the test point can be determined.

[0077] In the embodiments of the present disclosure, the flue gas temperature, the atmospheric pressure and the flue gas static pressure at the test point can be acquired, for example, the flue gas temperature at the test point can be measured and acquired by using a flue gas temperature measuring instrument, the flue gas static pressure at the test point can be measured and acquired by using a pressure measuring tube of a linked pressure gauge, and the atmospheric pressure can be a standard atmospheric pressure.

[0078] In the embodiments of the present disclosure, the second flue gas density at the test point under the standard state can be acquired.

[0079] As an example, the volume fractions of O2, CO2, CO, SO2, N2, NO and water vapor in the flue gas at the test point can be measured and acquired by using a flue gas analyzer, and the second flue gas density ρ st at the test point under the standard state can be determined according to the following formula:

[0080]

[0081] wherein, φO2 is the volume fraction of O2 in the flue gas at the test point, φCO2 is the volume fraction of CO2 in the flue gas at the test point, CO φCO is the volume fraction of CO in the flue gas at the test point, φSO2 is the volume fraction of SO2 in the flue gas at the test point, φN2 is the volume fraction of N2 in the flue gas at the test point, NO φNO is the volume fraction of NO in the flue gas at the test point, and wv φH2O is the volume fraction of water vapor in the flue gas at the test point, and the above volume fractions satisfy the following formula:

[0082]

[0083] In the embodiments of the present disclosure, based on the second flue gas density and based on the flue gas temperature, the atmospheric pressure and the flue gas static pressure at the test point, the first flue gas density at the test point can be determined.

[0084] For example, assuming that the second flue gas density is ρ st , the flue gas temperature at the test point is t, and the atmospheric pressure is patm The static pressure of the flue gas at the test point is p, and the first flue gas density p at the test point can be determined according to the following formula:

[0085]

[0086] Therefore, the first flue gas density at the test point can be effectively obtained.

[0087] It can be understood that the dynamic pressure measuring pipe can have a corresponding dynamic pressure measuring pipe coefficient, which is denoted as the seventh coefficient in the present disclosure.

[0088] In the embodiments of the present disclosure, the flue gas flow rate at the test point can be determined based on the seventh coefficient of the dynamic pressure measuring pipe, the first flue gas density at the test point, and the pressure difference.

[0089] For example, assuming that the seventh coefficient of the dynamic pressure measuring pipe is k, the first flue gas density at the test point is p, and the pressure difference at the test point is Δp, the flue gas flow rate v at the test point can be determined according to the following formula:

[0090]

[0091] Step 303: obtaining the cross-sectional area at the test point.

[0092] In the embodiments of the present disclosure, the cross-sectional area at the test point can be obtained.

[0093] Step 304: determining the flue gas flow rate at the test point according to the flue gas flow rate at the test point and the cross-sectional area at the test point.

[0094] In the embodiments of the present disclosure, the flue gas flow rate at the test point can be determined according to the flue gas flow rate at the test point and the cross-sectional area at the test point.

[0095] For example, the flue gas flow rate at the test point is v, and the cross-sectional area at the test point is A, and the flue gas flow rate q at the test point can be determined according to the following formula:

[0096] q = 3600vA (9)

[0097] Step 305: determining the target oxygen content at the flue duct of the target boiler based on the flue gas flow rates at the multiple test points and the oxygen volume fractions.

[0098] As a possible implementation manner, for any test point, the first oxygen content at the test point can be determined based on the product of the flue gas flow rate at the test point and the oxygen volume fraction at the test point; the first oxygen contents at the test points are accumulated to obtain a fifth coefficient; the flue gas flow rates at the test points are accumulated to obtain a sixth coefficient; and the target oxygen content at the flue duct of the target boiler can be determined according to the ratio of the fifth coefficient and the sixth coefficient.

[0099] As an example, assuming that the test points in the sampling cross section are distributed in m rows and n columns, for the test point in the i-th row and the j-th column, the first oxygen content at the test point can be determined based on the product of the flue gas flow q ij and the oxygen volume fraction wherein i∈[1, m], j∈[1, n], and i and j are positive integers; the first oxygen contents at the test points can be accumulated, and the fifth coefficient can be obtained, which is The flue gas flows at the test points can be accumulated, and the sixth coefficient can be obtained, which is Finally, the target oxygen content at the flue duct of the target boiler can be determined according to the ratio of the fifth coefficient and the sixth coefficient

[0100]

[0101] The method for determining the oxygen content at the flue duct of the boiler according to the embodiments of the present disclosure can obtain the flue gas flow rate at the test point based on the pressure difference of the test point for any test point; obtain the cross-sectional area at the test point; determine the flue gas flow at the test point according to the flue gas flow rate and the cross-sectional area at the test point; and determine the target oxygen content at the flue duct of the target boiler based on the flue gas flow and the oxygen volume fraction at the multiple test points. Thus, the flue gas flow at the multiple test points at the flue duct of the target boiler can be effectively obtained, and the target oxygen content at the flue duct of the target boiler can be effectively determined based on the flue gas flow and the oxygen volume fraction at the multiple test points.

[0102] It should be noted that the inventors found in the research that due to the complex flow process in the tail flue duct of the boiler, the flue duct is arranged with multiple turns, and the flue gas flow field is seriously backflowed and turbulent in some areas, resulting in different flue gas flow rates at different positions of the sampling cross section, uneven flue gas flow field, and thus large deviation in the test results of the oxygen content at the sampling positions of the sampling cross section. Therefore, the inventors propose to correct the test results of the oxygen content by the flue gas flow of the sampling cross section.

[0103] As an example, the method for determining the oxygen content at the flue duct of the boiler according to the present disclosure can include the following processes:

[0104] First, a sampling cross section at the tail flue duct of the boiler furnace is adopted, and the sampling cross section can have multiple test points, and the test points in the sampling cross section are distributed in m rows and n columns, and m and n are positive integers, and the sampling cross section is as shown in Figure 2 .

[0105] 1. Calculation of flue gas flow

[0106] ​1.1 Obtain the first flue gas density at the test point.

[0107] Specifically, the flue gas temperature, atmospheric pressure and flue gas static pressure at the test point can be obtained, and the second flue gas density of the test point under standard state can be obtained; based on the second flue gas density and based on the flue gas temperature, atmospheric pressure and flue gas static pressure at the test point, the first flue gas density at the test point can be determined.

[0108] Wherein, the flue gas analyzer can be used to measure and obtain the volume fractions of O2, CO2, CO, SO2, N2, NO and water vapor in the flue gas at the test point, and then the second flue gas density of the test point under standard state can be determined according to the following formula (5). st , wherein, is the volume fraction of O2 in the flue gas at the test point, is the volume fraction of CO2 in the flue gas at the test point, CO is the volume fraction of CO in the flue gas at the test point, is the volume fraction of SO2 in the flue gas at the test point; is the volume fraction of N2 in the flue gas at the test point, NO is the volume fraction of NO in the flue gas at the test point, wv is the volume fraction of water vapor in the flue gas at the test point, and each of the above volume fractions satisfies the following formula (6).

[0109] Wherein, when the second flue gas density is ρ st , the flue gas temperature at the test point is t, the atmospheric pressure is p atm , and the flue gas static pressure at the test point is p, the first flue gas density at the test point can be determined according to formula (7).

[0110] 1.2 Determine the flue gas flow rate at the test point based on the seventh coefficient of the dynamic pressure measuring tube, the first flue gas density at the test point and the pressure difference.

[0111] Assuming that the seventh coefficient of the dynamic pressure measuring tube is k, the first flue gas density at the test point is ρ, and the pressure difference at the test point is Δp, the flue gas flow rate v at the test point can be determined according to formula (8).

[0112] 1.3 Obtain the cross-sectional area at the test point, and determine the flue gas flow at the test point based on the flue gas flow rate at the test point and the cross-sectional area.

[0113] The flue gas flow rate at the test point is v, and the cross-sectional area of the test point is A, and the flue gas flow q at the test point can be determined according to formula (9).

[0114] According to the formula (5) (7) (8) (9), the flue gas flow q can also be expressed as:

[0115]

[0116] 2. Oxygen content correction

[0117] For the test point of the i-th row and the j-th column, first, the first oxygen content at the test point can be determined based on the product of the flue gas flow q ij and the oxygen volume fraction φ O2ij at the test point, which is where i∈[1, m], j∈[1, n], and i, j are positive integers.

[0118] Secondly, the first oxygen content at each test point can be accumulated to obtain a fifth coefficient, which is

[0119] Thirdly, the flue gas flow at each test point can be accumulated to obtain a sixth coefficient, which is

[0120] Finally, according to the fifth coefficient and the sixth coefficient, the target oxygen content at the flue gas duct of the target boiler can be determined according to the formula (10)

[0121] 3. Sampling test

[0122] It should be noted that in the sampling test, each test point is uniformly distributed on the sampling cross section of the flue gas duct.

[0123] Combining steps 1 and 2, the target oxygen content at the sampling cross section of the flue gas duct can be expressed by the following formula:

[0124]

[0125] where Δp ij is the pressure difference at the test point of the i-th row and the j-th column, Aij is the interface area at the test point of the i-th row and the j-th column, and ρ ij is the first flue gas density at the test point of the i-th row and the j-th column.

[0126] It should be noted that, since the positions of the test points are uniformly distributed, the cross-sectional areas at the test points can be regarded as the same; and in the same test, the same dynamic pressure measuring tube is used to measure the pressure differences at the test points, so the seventh coefficient of the dynamic pressure measuring tube is the same; and since the flue gas has been fully mixed in the furnace and the sampling cross-section is located at the tail flue position at the rear part of the furnace, the flue gas density is relatively uniform, so the flue gas densities at the test points of the sampling cross-section can be regarded as the same. Thus, after the partial common factor and the constant in formula (12) are divided, the formula of the target oxygen content, i.e. formula (1), can be obtained.

[0127] Therefore, when determining the oxygen content at the flue, the differential pressures and oxygen volume fractions at the test points can be measured, and the flue gas content at the flue can be effectively determined based on the differential pressures and oxygen volume fractions at the test points.

[0128] The above Figures 1 to 3 The embodiment provides a method for determining the oxygen content at the flue of a boiler. Figures 1 to 3 The embodiment provides a method for determining the oxygen content at the flue of a boiler.

[0129] Figure 4 FIG. 4 is a structural schematic diagram of a device for determining the oxygen content at the flue of a boiler provided by a third embodiment of the present disclosure.

[0130] As Figure 4 shown, the device 400 for determining the oxygen content at the flue of a boiler can include an acquisition module 401 and a first determination module 402.

[0131] The acquisition module 401 is configured to acquire the pressure differences and oxygen volume fractions of multiple test points at the flue of a target boiler.

[0132] The first determination module 402 is configured to determine the target oxygen content at the flue of the target boiler based on the pressure differences and oxygen volume fractions of the multiple test points.

[0133] In a possible implementation manner of the embodiment of the present disclosure, the first determining module 402 is configured to: for any test point, determining a first coefficient of the test point according to the square root of the pressure difference of the test point; determining a second coefficient of the test point according to the product of the first coefficient and the oxygen volume fraction at the test point; accumulating the first coefficients of the test points to obtain a third coefficient, and accumulating the second coefficients of the test points to obtain a fourth coefficient; and determining the target oxygen content at the flue of the target boiler according to the ratio of the fourth coefficient to the third coefficient.

[0134] In a possible implementation manner of the embodiment of the present disclosure, the first determining module 402 is configured to: for any test point, obtaining the flue gas flow rate at the test point based on the pressure difference of the test point; obtaining the cross-sectional area at the test point; determining the flue gas flow at the test point according to the flue gas flow rate and the cross-sectional area at the test point; and determining the target oxygen content at the flue of the target boiler based on the flue gas flow and the oxygen volume fraction at the plurality of test points.

[0135] In a possible implementation manner of the embodiment of the present disclosure, the first determining module 402 is configured to: for any test point, determining a first oxygen content at the test point based on the product of the flue gas flow and the oxygen volume fraction at the test point; accumulating the first oxygen contents at the test points to obtain a fifth coefficient; accumulating the flue gas flows at the test points to obtain a sixth coefficient; and determining the target oxygen content at the flue of the target boiler according to the ratio of the fifth coefficient to the sixth coefficient.

[0136] In a possible implementation manner of the embodiment of the present disclosure, the pressure difference of the test point is measured by a dynamic pressure measuring pipe; and the first determining module 402 is configured to: obtain a first flue gas density at the test point; obtain a seventh coefficient of the dynamic pressure measuring pipe; and determine the flue gas flow rate at the test point based on the seventh coefficient of the dynamic pressure measuring pipe, the first flue gas density at the test point, and the pressure difference.

[0137] In a possible implementation manner of the embodiment of the present disclosure, the first determining module 402 is configured to: obtain the flue gas temperature, the atmospheric pressure, and the flue gas static pressure at the test point; obtain a second flue gas density at the test point in a standard state; and determine the first flue gas density at the test point based on the second flue gas density, and based on the flue gas temperature, the atmospheric pressure, and the flue gas static pressure at the test point.

[0138] In a possible implementation manner of the embodiment of the present disclosure, the device 400 for determining the oxygen content at the flue of the boiler can further include:

[0139] The reducing module is configured to, in response to the target oxygen content being greater than a first set threshold, reduce the opening angle of the damper of the target boiler, and / or reduce the opening angle of the flue baffle.

[0140] The amplification module is used to increase the opening angle of the damper of the target boiler and / or increase the opening angle of the flue damper in response to the target oxygen content being less than a second set threshold.

[0141] Wherein, the first set threshold is greater than or equal to the second set threshold.

[0142] In one possible implementation of this disclosure, the oxygen content determination device 400 at the boiler flue may further include:

[0143] The second determining module is used to determine the air leakage rate of the air preheater of the target boiler based on the target oxygen content.

[0144] The apparatus for determining the oxygen content at the boiler flue of this disclosure acquires the pressure difference and oxygen volume fraction at multiple test points at the flue of the target boiler; and determines the target oxygen content at the flue of the target boiler based on the pressure difference and oxygen volume fraction at the multiple test points. Thus, the target oxygen content at the flue of the target boiler can be effectively determined based on the pressure difference and oxygen volume fraction at multiple test points at the flue of the target boiler.

[0145] To implement the above embodiments, the present invention also proposes an electronic device, including: a memory, a processor, and a computer program stored in the memory and executable on the processor. When the processor executes the program, it implements the method for determining the oxygen content at the boiler flue as proposed in any of the foregoing embodiments of the present invention.

[0146] To implement the above embodiments, the present invention also proposes a non-transitory computer-readable storage medium storing a computer program thereon, characterized in that, when executed by a processor, the program implements the method for determining the oxygen content in the boiler flue as proposed in any of the foregoing embodiments of the present invention.

[0147] To implement the above embodiments, the present invention also proposes a computer program product, which, when the instructions in the computer program product are executed by a processor, performs the method for determining the oxygen content in the boiler flue as proposed in any of the foregoing embodiments of the present invention.

[0148] According to embodiments of the present invention, the present invention also provides an electronic device, a non-transitory computer-readable storage medium, and a computer program product.

[0149] like Figure 5 As shown, the electronic device 12 is represented in the form of a general-purpose computing device. The components of the electronic device 12 may include, but are not limited to: one or more processors or processing units 16, system memory 28, and bus 18 connecting different system components (including system memory 28 and processing unit 16).

[0150] Bus 18 represents one or more of several bus architectures, including a memory bus or memory controller, a peripheral bus, a graphics acceleration port, a processor, or a local bus using any of the various bus architectures. Examples of these architectures include, but are not limited to, the Industry Standard Architecture (ISA) bus, the Micro Channel Architecture (MAC) bus, the Enhanced ISA bus, the Video Electronics Standards Association (VESA) local bus, and the Peripheral Component Interconnect (PCI) bus.

[0151] Electronic device 12 typically includes a variety of computer system readable media. These media can be any available media that can be accessed by electronic device 12, including volatile and non-volatile media, removable and non-removable media.

[0152] Memory 28 may include computer system readable media in the form of volatile memory, such as Random Access Memory (RAM) 30 and / or cache memory 32. Electronic device 12 may further include other removable / non-removable, volatile / non-volatile computer system storage media. By way of example only, storage system 34 may be used to read and write non-removable, non-volatile magnetic media (… Figure 5 Not shown; usually referred to as a "hard drive"). Although Figure 5 Not shown, a disk drive for reading and writing to a removable non-volatile disk (e.g., a "floppy disk") and an optical disc drive for reading and writing to a removable non-volatile optical disc (e.g., a compact disc read-only memory (CD-ROM), a digital video disc read-only memory (DVD-ROM), or other optical media) may be provided. In these cases, each drive may be connected to bus 18 via one or more data media interfaces. Memory 28 may include at least one program product having a set (e.g., at least one) of program modules configured to perform the functions of the embodiments of the present invention.

[0153] Program / utility 40 having a set of program modules 42 can be stored in memory 28 by way of example, such program modules 42 include an operating system, one or more application programs, other program modules, and program data, each or some combination thereof, which can include implementation of the network environment in each or some combination thereof. Program modules 42 generally carry out the functions and / or methodologies of embodiments described herein.

[0154] Electronic device 12 can also communicate with one or more external devices 14 such as a keyboard or a pointing device, displays 24, etc.; other devices such as devices that enable a user to interact with electronic device 12; and / or any devices (e.g., network card, modem, etc.) that enable electronic device 12 to communicate with one or more other computing devices. Such communication can occur via input / output (I / O) interface 22. Still yet, electronic device 12 can communicate with one or more networks such as a local area network (LAN), a wide area network (WAN), and / or the Internet through network adapter 20. As an example, network adapter 20 can include a modem, a network card (wireless or wired), or other well-known interface devices. As depicted, network adapter 20 communicates with the other

[0155] Processing unit 16 can execute the various functions and data processing by running programs stored in system memory 28, such as implementing the methods described in the aforementioned embodiments.

[0156] In the description of the specification, the description of the terms "one embodiment", "some embodiments", "an example", "a specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In the specification, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any suitable manner in any one or more embodiments or examples. In addition, the person skilled in the art can combine and combine the different embodiments or examples described in the specification and the features of the different embodiments or examples without contradiction.

[0157] Moreover, the terms "first", "second", "third", etc. are used herein only to describe different steps or categories of steps in a claim for patent purposes, and are not to be construed as implying or implying relative importance or a number of indicated technical features. Thus, features defined with "first", "second" can explicitly or implicitly include at least one of the features. In the description of the present application, the meaning of "a plurality" is at least two, for example, two, three, etc., unless otherwise explicitly specified.

[0158] Any process or method descriptions or descriptions of the flow diagrams described herein or otherwise described herein can be understood as representing the modules, segments or portions of code that include executable instructions for implementing custom logic functions or processes, and the scope of preferred embodiments of the present application includes additional implementations in which the functions described are performed in different orders, including substantially simultaneously, or in reverse order, as will be understood by those skilled in the art of the embodiments of the present application.

[0159] The logic and / or steps represented in the flow diagrams or otherwise described herein, for example, can be considered as a list of executable instructions for implementing the logic function, which can be specifically embodied in any computer-readable medium for use by or in connection with an instruction execution system, apparatus or device, such as a computer-based system, a system including a processor or other system that can fetch the instructions from an instruction execution system, apparatus or device and execute the instructions. For the purposes of this specification, "computer-readable medium" can be any apparatus that can contain, store, communicate, propagate or transport the program for use by or in connection with the instruction execution system, apparatus or device or in conjunction with these instruction execution systems, apparatus or devices. More specific examples (non-exhaustive list) of computer-readable medium include the following: electrical connections having one or more wires (electronic devices), portable computer diskette (magnetic devices), random access memory (RAM), read-only memory (ROM), erasable programmable read-only memory (EPROM or flash memory), fiber optic devices, and portable compact disc read-only memory (CD ROM). In addition, the computer-readable medium can even be paper or other suitable medium on which the program can be printed, as the program can be electronically obtained, for example, by optical scanning of the paper or other medium, followed by editing, interpretation or necessary processing, if necessary, in other suitable manner, and then stored in computer memory.

[0160] It should be understood that each part of the present application can be realized by hardware, software, firmware or their combination. In the above-mentioned embodiments, a plurality of steps or methods can be realized by software or firmware stored in a memory and executed by a suitable instruction execution system. As in another embodiment, if realized by hardware, any one or their combination of the following technologies known in the art can be used: discrete logic circuit with logic gate circuit for implementing logic function on data signal, application specific integrated circuit with suitable combination logic gate circuit, programmable gate array (PGA), field programmable gate array (FPGA) and the like.

[0161] Those skilled in the art of the present technology can understand that all or part of the steps carried out by the above-mentioned embodiment method can be completed by a program instructing the relevant hardware, and the program can be stored in a computer readable storage medium. When the program is executed, it includes one of the steps of the method embodiment or a combination thereof.

[0162] In addition, each functional unit in each embodiment of the present application can be integrated in one processing module, or each unit can exist physically alone, or two or more units can be integrated in one module. The above-mentioned integrated module can be realized in the form of hardware or in the form of software functional module. When the integrated module is realized in the form of software functional module and sold or used as an independent product, it can also be stored in a computer readable storage medium.

[0163] The above-mentioned storage medium can be read-only memory, disk or optical disk, etc. Although the embodiments of the present application have been shown and described above, it should be understood that the above-mentioned embodiments are exemplary and cannot be understood as limiting the present application, and those skilled in the art can make changes, modifications, replacements and variations to the above-mentioned embodiments within the scope of the present application.

Claims

1. A method of determining the oxygen content at the flue of a boiler, characterized in that, The method comprises: acquiring pressure differences and oxygen volume fractions at multiple test points at a flue of a target boiler; determining a target oxygen content at the flue of the target boiler based on the pressure differences and the oxygen volume fractions at the multiple test points; the pressure difference at the test point is measured by a dynamic pressure measuring tube; wherein the determining the target oxygen content at the flue of the target boiler based on the pressure differences and the oxygen volume fractions at the multiple test points comprises: for any test point, determining a first coefficient of the test point according to a square root of the pressure difference of the test point; determining a second coefficient of the test point according to a product of the first coefficient and the oxygen volume fraction at the test point; accumulating the first coefficients of the test points to obtain a third coefficient, and accumulating the second coefficients of the test points to obtain a fourth coefficient; determining the target oxygen content at the flue of the target boiler according to a ratio of the fourth coefficient to the third coefficient.

2. The method of claim 1, wherein, The determining the target oxygen content at the flue of the target boiler based on the pressure differences and the oxygen volume fractions at the multiple test points comprises: for any test point, acquiring a flue gas flow rate at the test point based on the pressure difference of the test point; acquiring a cross-sectional area at the test point; determining a flue gas flow at the test point according to the flue gas flow rate and the cross-sectional area at the test point; determining the target oxygen content at the flue of the target boiler based on the flue gas flows and the oxygen volume fractions at the multiple test points.

3. The method of claim 2, wherein, The determining the target oxygen content at the flue of the target boiler based on the flue gas flows and the oxygen volume fractions at the multiple test points comprises: for any test point, determining a first oxygen content at the test point based on a product of the flue gas flow and the oxygen volume fraction at the test point; accumulating the first oxygen contents at the test points to obtain a fifth coefficient; accumulating the flue gas flows at the test points to obtain a sixth coefficient; determining the target oxygen content at the flue of the target boiler according to a ratio of the fifth coefficient to the sixth coefficient.

4. The method of claim 2, wherein, The acquiring the flue gas flow rate at the test point based on the pressure difference of the test point comprises: acquiring a first flue gas density at the test point; acquiring a seventh coefficient of the dynamic pressure measuring tube; determining the flue gas flow rate at the test point based on the seventh coefficient of the dynamic pressure measuring tube, the first flue gas density and the pressure difference at the test point.

5. The method of claim 4, wherein, The acquiring the first flue gas density at the test point comprises: acquiring a flue gas temperature, an atmospheric pressure and a flue gas static pressure at the test point; acquiring a second flue gas density at the test point under a standard state; determining the first flue gas density at the test point based on the second flue gas density and based on the flue gas temperature, the atmospheric pressure and the flue gas static pressure at the test point.

6. The method according to any one of claims 1-5, characterized in that, The method further comprises: in response to the target oxygen content being greater than a first set threshold, reducing an opening angle of a damper of the target boiler and / or reducing an opening angle of a flue baffle. in response to the target oxygen content being less than a second set threshold, increasing an opening angle of a damper of the target boiler, and / or, increasing an opening angle of a flue baffle; wherein the first set threshold is greater than or equal to the second set threshold.

7. The method according to any one of claims 1-5, characterized in that, The method further comprises: determining a leakage rate of an air preheater of the target boiler according to the target oxygen content.

8. A device for determining the oxygen content at the flue of a boiler, characterized in that The device comprises: an obtaining module configured to obtain a differential pressure and an oxygen volume fraction at a plurality of test points at a flue of a target boiler; a first determining module configured to determine a target oxygen content at the flue of the target boiler based on the differential pressure and the oxygen volume fraction at the plurality of test points; the differential pressure at the test points is measured by a dynamic pressure measuring tube; wherein the first determining module is specifically configured to: for any test point, determine a first coefficient of the test point according to a square root of the differential pressure of the test point; determine a second coefficient of the test point according to a product of the first coefficient and the oxygen volume fraction at the test point; accumulate the first coefficients of the test points to obtain a third coefficient, and accumulate the second coefficients of the test points to obtain a fourth coefficient; determine the target oxygen content at the flue of the target boiler according to a ratio of the fourth coefficient to the third coefficient.

9. An electronic device, comprising: comprise: a memory, a processor, and a computer program stored in the memory and executable on the processor, the processor implementing the method for determining an oxygen content at a flue of a boiler according to any one of claims 1-7 when executing the program.

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