Anomaly detection method and device

Abstract

The embodiment of the present invention provides an abnormality detection method and device, the method comprising: generating a circulating water heat absorption value according to the acquired circulating water flow rate, the inlet temperature of the circulating water inlet and the outlet temperature of the circulating water outlet; generating a flue gas heat release value according to the acquired volume percentage of water vapor, a predetermined dry flue gas volume, a device inlet temperature, a device outlet temperature, the volume percentage of each component in the saturated wet flue gas, the latent heat of phase change and the flue gas pressure; generating an effective heat exchange ratio according to the flue gas heat release and the circulating water heat absorption value; if the effective heat exchange ratio is less than a set heat exchange ratio threshold, generating a warning signal, being able to perform abnormality detection and warning on the flue gas water extraction device, and improving the unit operation reliability.

Description

Technical Field

[0001] The present invention relates to the technical field of environmental monitoring, and in particular to an abnormality detection method and device. Background Art

[0002] At present, wet flue gas desulfurization is one of the effective measures for ultra-low emissions, but it also has the problems of high water consumption, chimney corrosion, and the easy occurrence of "white smoke" and "gypsum rain". In order to further extract the moisture in the flue gas from desulfurization, a flue gas water extraction device is installed at the rear of the outlet of the desulfurization device. However, there is no method for detecting the flue gas water extraction device in the relevant technology. If the operating parameters of the flue gas water extraction device are abnormal and cannot be discovered and corrected in time, the reliability of the unit operation will be directly affected in the later stage. Summary of the invention

[0003] One object of the present invention is to provide an abnormality detection method, which can detect and warn abnormalities of a flue gas water extraction device, thereby improving the operating reliability of the unit. Another object of the present invention is to provide an abnormality detection device. Another object of the present invention is to provide a computer-readable medium. Another object of the present invention is to provide a computer device.

[0004] In order to achieve the above objectives, the present invention discloses, on one hand, an anomaly detection method, comprising:

[0005] Generate the circulating water heat absorption amount according to the acquired circulating water flow rate, the inlet temperature of the circulating water inlet and the outlet temperature of the circulating water outlet;

[0006] Generate flue gas heat release according to the volume percentage of water vapor obtained, the predetermined dry flue gas volume, the device inlet temperature, the device outlet temperature, the volume percentage of each component in the saturated wet flue gas, the latent heat of phase change and the flue gas pressure;

[0007] Generate effective heat exchange ratio based on flue gas heat release and circulating water heat absorption;

[0008] If the effective heat exchange ratio is less than the set heat exchange ratio threshold, a warning signal is generated.

[0009] Preferably, the flue gas heat release is generated according to the volume percentage of the obtained water vapor, the predetermined dry flue gas volume, the device inlet temperature, the device outlet temperature, the volume percentage of each component in the saturated wet flue gas, the phase change latent heat and the flue gas pressure, including:

[0010] Generate a first flue gas heat release according to the dry flue gas volume, the volume percentage of water vapor, the device inlet temperature, the device outlet temperature and the volume percentage of each component in the saturated wet flue gas;

[0011] Generate a second flue gas heat release according to the phase change latent heat, the device inlet temperature, the device outlet temperature and the flue gas pressure;

[0012] The first flue gas heat release is added to the second flue gas heat release to obtain the flue gas heat release.

[0013] Preferably, generating the first flue gas heat release according to the dry flue gas volume, the volume percentage of water vapor, the device inlet temperature, the device outlet temperature and the volume percentage of each component in the saturated wet flue gas includes:

[0014] According to the volume percentage of dry flue gas and water vapor, the actual volume flow rate of saturated wet flue gas is generated;

[0015] The first flue gas heat release is generated according to the actual volume flow of the saturated wet flue gas, the device inlet temperature, the device outlet temperature and the volume percentage of each component in the saturated wet flue gas.

[0016] Preferably, generating the first flue gas heat release according to the actual volume flow rate of the saturated wet flue gas, the device inlet temperature, the device outlet temperature and the volume percentage of each component in the saturated wet flue gas comprises:

[0017] According to the inlet temperature of the device, the constant pressure specific heat of each component in the saturated wet flue gas is queried;

[0018] According to the constant pressure specific heat of each component in the saturated wet flue gas and the volume percentage of each component, the average constant pressure specific heat is calculated;

[0019] The first flue gas heat release is generated according to the average constant-pressure specific heat, the actual volume flow rate of the saturated wet flue gas, the device inlet temperature and the device outlet temperature.

[0020] Preferably, generating the second flue gas heat release according to the phase change latent heat, the device inlet temperature, the device outlet temperature and the flue gas pressure comprises:

[0021] The amount of flue gas condensate is generated based on the device inlet temperature, device outlet temperature and flue gas pressure through the Antoine equation;

[0022] Generate a second flue gas heat release according to the phase change latent heat and the amount of condensed water in the flue gas;

[0023] The present invention also discloses an abnormality detection device, comprising:

[0024] A first generating unit is used to generate a circulating water heat absorption amount according to the acquired circulating water flow rate, the inlet temperature of the circulating water inlet, and the outlet temperature of the circulating water outlet;

[0025] The second generating unit is used to generate the flue gas heat release according to the volume percentage of the obtained water vapor, the predetermined dry flue gas volume, the device inlet temperature, the device outlet temperature, the volume percentage of each component in the saturated wet flue gas, the phase change latent heat and the flue gas pressure;

[0026] The third generating unit is used to generate an effective heat exchange ratio according to the heat released by the flue gas and the heat absorbed by the circulating water;

[0027] The early warning unit is used to generate an early warning signal if the effective heat exchange ratio is less than a set heat exchange ratio threshold.

[0028] Preferably, the second generating unit is specifically used to generate the first flue gas heat release according to the dry flue gas volume, the volume percentage of water vapor, the device inlet temperature, the device outlet temperature and the volume percentage of each component in the saturated wet flue gas; generate the second flue gas heat release according to the phase change latent heat, the device inlet temperature, the device outlet temperature and the flue gas pressure. The first flue gas heat release and the second flue gas heat release are added to obtain the flue gas heat release.

[0029] Preferably, the second generating unit is specifically used to generate the actual volume flow rate of saturated wet flue gas according to the volume percentage of dry flue gas and water vapor; and to generate the first flue gas heat release according to the actual volume flow rate of saturated wet flue gas, the device inlet temperature, the device outlet temperature and the volume percentage of each component in the saturated wet flue gas.

[0030] The present invention also discloses a computer-readable medium on which a computer program is stored. When the program is executed by a processor, the method described above is implemented.

[0031] The present invention also discloses a computer device, including a memory and a processor, wherein the memory is used to store information including program instructions, the processor is used to control the execution of program instructions, and the processor implements the above method when executing the program.

[0032] The present invention generates a circulating water heat absorption value according to the acquired circulating water flow rate, the inlet temperature of the circulating water inlet and the outlet temperature of the circulating water outlet; generates a flue gas heat release value according to the acquired volume percentage of water vapor, a predetermined dry flue gas volume, a device inlet temperature, a device outlet temperature, the volume percentage of each component in the saturated wet flue gas, the phase change latent heat and the flue gas pressure; generates an effective heat exchange ratio according to the flue gas heat release and the circulating water heat absorption value; and generates a warning signal if the effective heat exchange ratio is less than a set heat exchange ratio threshold value, so as to perform abnormal detection and warning on the flue gas water lifting device and improve the operating reliability of the unit. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0034] Figure 1A flowchart of an anomaly detection method provided by an embodiment of the present invention;

[0035] Figure 2 A flowchart of another anomaly detection method provided by an embodiment of the present invention;

[0036] Figure 3 A schematic diagram of the structure of an abnormality detection device provided by an embodiment of the present invention;

[0037] Figure 4 A schematic diagram of the structure of a computer device provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0038] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0039] In order to facilitate the understanding of the technical solution provided by the present application, the relevant contents of the technical solution of the present application are first described below. At present, wet desulfurization is the most widely used, most mature and most efficient flue gas desulfurization method. After flue gas desulfurization of coal-fired units, it is in a saturated wet flue gas state, and the flue gas temperature is between 45°C and 60°C. The flue gas water lifting device is usually located at the rear of the outlet of the desulfurization device, and liquid water is condensed and precipitated by flue gas cooling to achieve the flue gas water lifting effect. In the actual operation of the flue gas water lifting device, due to factors such as heat exchange surface contamination, flue corrosion, insufficient output of the circulating pump, and pipeline leakage, the theoretical water lifting performance and the actual water lifting performance deviate. In order to be able to detect the operating status of the flue gas water lifting device in a timely manner, thereby avoiding affecting the operating reliability of the unit, an embodiment of the present invention provides an abnormality detection method.

[0040] The following takes the anomaly detection device as an example to illustrate the implementation process of the anomaly detection method provided by the embodiment of the present invention. It is understandable that the execution subject of the anomaly detection method provided by the embodiment of the present invention includes but is not limited to the anomaly detection device.

[0041] Figure 1 A flowchart of an abnormality detection method provided by an embodiment of the present invention is as follows: Figure 1 As shown, the method includes:

[0042] Step 101: Generate the amount of circulating water heat absorption according to the acquired circulating water flow rate, the inlet temperature of the circulating water inlet, and the outlet temperature of the circulating water outlet.

[0043] Step 102: Generate flue gas heat release according to the volume percentage of the acquired water vapor, the predetermined dry flue gas volume, the device inlet temperature, the device outlet temperature, the volume percentage of each component in the saturated wet flue gas, the phase change latent heat and the flue gas pressure.

[0044] Step 103: Generate an effective heat exchange ratio according to the heat released by the flue gas and the heat absorbed by the circulating water.

[0045] Step 104: If the effective heat exchange ratio is less than the set heat exchange ratio threshold, a warning signal is generated.

[0046] In the technical solution provided by the embodiment of the present invention, the circulating water heat absorption is generated according to the acquired circulating water flow rate, the inlet temperature of the circulating water inlet and the outlet temperature of the circulating water outlet; the flue gas heat release is generated according to the acquired volume percentage of water vapor, the predetermined dry flue gas volume, the device inlet temperature, the device outlet temperature, the volume percentage of each component in the saturated wet flue gas, the phase change latent heat and the flue gas pressure; the effective heat exchange ratio is generated according to the flue gas heat release and the circulating water heat absorption; if the effective heat exchange ratio is less than the set heat exchange ratio threshold, an early warning signal is generated, which can perform abnormal detection and early warning on the flue gas water lifting device, thereby improving the unit operation reliability.

[0047] Figure 2 A flowchart of another anomaly detection method provided by an embodiment of the present invention is as follows: Figure 2 As shown, the method includes:

[0048] Step 201: Generate the amount of circulating water heat absorption according to the acquired circulating water flow rate, the inlet temperature of the circulating water inlet, and the outlet temperature of the circulating water outlet.

[0049] In the embodiment of the present invention, each step is performed by an abnormality detection device.

[0050] In the embodiment of the present invention, the circulating water flow rate can be measured by a flow meter in tons per hour (t / h), and the inlet temperature of the circulating water inlet and the outlet temperature of the circulating water outlet can be detected by a temperature sensor.

[0051] Specifically, through The specific heat capacity of water, circulating water flow rate, inlet temperature and outlet temperature are calculated to obtain the circulating water heat absorption. x is the heat absorbed by the circulating water, in megawatts (MW); C is the specific heat capacity of water, which is 4.2MJ / (t·℃); G x is the circulating water flow rate; t xr is the inlet temperature; t xc is the outlet temperature.

[0052] Step 202: Generate flue gas heat release according to the volume percentage of the acquired water vapor, the predetermined dry flue gas volume, the device inlet temperature, the device outlet temperature, the volume percentage of each component in the saturated wet flue gas, the phase change latent heat and the flue gas pressure.

[0053] In the embodiment of the present invention, the heat released in the flue gas water extraction process is determined according to the temperature of the flue gas before and after it flows through the flue gas water extraction device. The heat released by the flue gas is divided into two parts, one part is the sensible heat caused by the temperature reduction of the saturated wet flue gas, that is, the first flue gas heat release, and the other part is the latent heat released by the condensation of liquid water from the saturated wet flue gas, that is, the second flue gas heat release.

[0054] In the embodiment of the present invention, the amount of dry flue gas after desulfurization is determined according to the obtained flue gas oxygen content, the amount of coal burned by the unit, the coal quality parameters, the proportion of gaseous sulfur oxides, the denitrification efficiency and the desulfurization efficiency. Specifically, the amount of dry flue gas after desulfurization, the amount of coal burned by the unit, the raw coal-based carbon content, the raw coal-based sulfur content, the raw coal-based hydrogen content, the raw coal-based oxygen content, the raw coal-based nitrogen content, the proportion of gaseous sulfur oxides after raw coal combustion (dimensionless), the desulfurization efficiency and the denitrification efficiency are calculated by the following formula to determine the dry flue gas volume.

[0055]

[0056] Among them, G gy is the dry flue gas volume, B is the coal burning volume of the unit, C ar is the raw coal-based carbon content, S ar is the raw coal-based sulfur content, H ar is the raw coal-based hydrogen content, O ar is the oxygen content of raw coal, N ar is the raw coal-based nitrogen content, χ is the proportion of gaseous sulfur oxides after raw coal combustion (dimensionless), ψ is the desulfurization efficiency, and ζ is the denitrification efficiency. Among them, the unit coal combustion amount B can be read from the DCS dial; coal quality parameters include but are not limited to raw coal-based carbon content, raw coal-based sulfur content, raw coal-based hydrogen content, raw coal-based oxygen content and raw coal-based nitrogen content, and the units of coal quality parameters are all percentages (%). It is worth noting that the coal quality parameters are obtained from industrial standards, and optionally, the industrial standard is the Chinese National Standard for Coal Classification (GB5751-86); the proportion of gaseous sulfur oxides, denitrification efficiency and desulfurization efficiency can be read from the dial of the distributed control system (DCS).

[0057] In the embodiment of the present invention, step 202 specifically includes:

[0058] Step 2021: Generate a first flue gas heat release value according to the dry flue gas volume, the volume percentage of water vapor, the device inlet temperature, the device outlet temperature and the volume percentage of each component in the saturated wet flue gas.

[0059] In the embodiment of the present invention, step 2021 specifically includes:

[0060] Step 1a: Generate the actual volume flow rate of saturated wet flue gas according to the volume percentage of dry flue gas and water vapor.

[0061] In the embodiment of the present invention, the volume percentage of water vapor can be read from the DCS dial, and the unit is %.

[0062] Specifically, through The volume percentage of dry flue gas and water vapor is calculated to generate the actual volume flow rate of saturated wet flue gas. y1 is the actual volume flow rate of saturated wet flue gas, is the volume percentage of water vapor, G gy The dry flue gas volume.

[0063] Step 1b: Generate a first flue gas heat release value according to the actual volume flow rate of the saturated wet flue gas, the device inlet temperature, the device outlet temperature and the volume percentage of each component in the saturated wet flue gas.

[0064] In the embodiment of the present invention, the device inlet temperature and the device outlet temperature can be detected and obtained by temperature sensors arranged at the device inlet and the device outlet. Flue gas contains multiple components, including but not limited to oxygen (O2), carbon dioxide (CO2), carbon monoxide (CO), sulfur dioxide (SO2), nitrogen (N2), nitric oxide (NO), and water (H2O). The volume percentage of each component can be read from the DCS dial in %.

[0065] Specifically, according to the inlet temperature of the device, the constant pressure specific heat of each component in the saturated wet flue gas is queried. The constant pressure specific heat of each component in the saturated wet flue gas can be queried from Appendix E of GB / T 10184-2015 Power Plant Boiler Performance Test Procedure, and the constant pressure specific heat of each component in the saturated wet flue gas corresponding to the inlet temperature of the device is determined by interpolation. The constant pressure specific heat unit is kJ / (m 3 ·℃).

[0066] The average specific heat at constant pressure is calculated using the following formula based on the specific heat at constant pressure of each component in the saturated wet flue gas and the volume percentage of each component.

[0067]

[0068] in, are the volume percentages of O2, CO2, CO, H2O, SO2, N2, NO, and H2O at the inlet of the flue gas water extraction device, respectively; are the average constant pressure specific heat of O2, CO2, CO, H2O, SO2, N2, NO, and H2O at the inlet of the flue gas water extraction device, Cp is the average specific heat at constant pressure.

[0069] pass The first flue gas heat release is generated according to the average constant pressure specific heat, the actual volume flow rate of saturated wet flue gas, the device inlet temperature and the device outlet temperature, where Q y1 is the heat release of the first flue gas, G y1 is the actual volume flow rate of saturated wet flue gas, C p is the average specific heat at constant pressure, t yr is the device inlet temperature, t yc is the device outlet temperature.

[0070] Step 2022: Generate a second flue gas heat release amount according to the phase change latent heat, the device inlet temperature, the device outlet temperature and the flue gas pressure.

[0071] In the embodiment of the present invention, step 2022 specifically includes:

[0072] Step 2a: Generate the amount of flue gas condensate water according to the device inlet temperature, device outlet temperature and flue gas pressure through the Antoine equation.

[0073] In the embodiment of the present invention, the partial pressure of saturated water vapor in the temperature range of 0°C to 200°C can be obtained by solving the outlet flue gas temperature through the Antoine equation. The outlet flue gas temperature can be detected and obtained through a temperature sensor.

[0074] In the embodiment of the present invention, the flue gas pressure includes the flue gas near pressure and the ambient atmospheric pressure. Both the flue gas near pressure and the ambient atmospheric pressure can be read from the DCS dial in units of MPa.

[0075] Specifically, through T=t yr +273.15, calculate the inlet flue gas temperature and generate the inlet saturated water vapor partial pressure. yr is the inlet flue gas temperature in degrees Celsius (℃); T is the intermediate temperature parameter in Kelvin (K); P sr is the partial pressure of the inlet saturated water vapor, in megapascals (MPa). The partial pressure of the inlet saturated water vapor, the flue gas pressure and the ambient atmospheric pressure are calculated to generate the inlet moisture content. sr is the partial pressure of saturated water vapor at the inlet, P st is the flue gas pressure, P act is the ambient atmospheric pressure, d yr It is the inlet moisture content in grams per kilogram (g / kg).

[0076] pass T=tyc +273.15, calculate the outlet flue gas temperature and generate the outlet saturated water vapor partial pressure. yc is the outlet flue gas temperature in degrees Celsius (℃); T is the intermediate temperature parameter in Kelvin (K); P sc is the partial pressure of saturated water vapor at the outlet, in megapascals (MPa). The outlet saturated water vapor partial pressure, flue gas pressure and ambient atmospheric pressure are calculated to generate the outlet moisture content. sc is the partial pressure of saturated water vapor at the outlet, P st is the flue gas pressure, P act is the ambient atmospheric pressure, d yc It is the outlet moisture content in grams per kilogram (g / kg).

[0077] Through D = ρG gy (d yr -d yc )×10 -6 , calculate the inlet moisture content, outlet moisture content, dry flue gas volume and the predetermined flue gas standard dry density to generate the flue gas condensate volume. Where ρ is the flue gas density, d yc is the outlet moisture content, d yr is the inlet moisture content, G gy is the dry flue gas volume, D is the flue gas condensate volume, and the unit is tons per hour (t / h). Among them, the desulfurized flue gas contains multiple components, including but not limited to oxygen (O2), carbon dioxide (CO2), carbon monoxide (CO), sulfur dioxide (SO2), nitrogen (N2), and nitric oxide (NO).

[0078] Specifically, the volume percentage of each component can be read from the DCS dial in %. The volume percentage of each component in the desulfurized flue gas is calculated to generate the flue gas density. Among them, ρ is the flue gas density, the unit is kilograms per cubic meter (kg / m 3 ); They are the volume percentages of O2, CO2, CO, SO2, N2 and NO in the desulfurized flue gas respectively.

[0079] In the embodiment of the present invention, the influence of water vapor can be eliminated and the smoke density under the standard state can be determined.

[0080] Step 2b: generating a second flue gas heat release amount according to the phase change latent heat and the amount of condensed water in the flue gas.

[0081] In the embodiment of the present invention, the latent heat of phase change is found out through the thermodynamic property table of water and water vapor according to the outlet temperature of the device and the flue gas pressure, and the unit is kilojoule per kilogram (kJ / kg).

[0082] Specifically, through The latent heat of phase change and the amount of condensed water in the flue gas are calculated to obtain the second flue gas heat release. y2 is the heat released by the second flue gas, r is the latent heat of phase change, and D is the amount of condensed water in the flue gas.

[0083] Step 2023: Add the first flue gas heat release and the second flue gas heat release to obtain the flue gas heat release.

[0084] Specifically, through Q y =Q y1 +Q y2 , add the first flue gas heat release and the second flue gas heat release to obtain the flue gas heat release. y is the heat released by the flue gas, Q y1 is the heat released by the first flue gas, Q y2 Heat is released for the second flue gas.

[0085] Step 203: Generate an effective heat exchange ratio according to the heat released by the flue gas and the heat absorbed by the circulating water.

[0086] In the embodiment of the present invention, the ratio of the heat absorbed by the circulating water to the heat released by the flue gas is determined as the effective heat exchange ratio, that is: Among them, Q y is the heat released by the flue gas, Q x is the amount of heat absorbed by circulating water, and β is the effective heat exchange ratio.

[0087] Step 204 , determine whether the effective heat exchange ratio is less than the set heat exchange ratio threshold value, if so, execute step 205 ; if not, execute step 201 .

[0088] In the embodiment of the present invention, if the effective heat exchange ratio β is less than the heat exchange ratio threshold β0, it indicates that the heat exchange of the flue gas water lifting device is abnormal and the system operation fails. The operating personnel are guided to check the problems such as contamination of the heating surface, corrosion of the flue, insufficient output of the circulating pump, and pipeline leakage, and continue to execute step 205; if the effective heat exchange ratio β is greater than or equal to the heat exchange ratio threshold β0, it indicates that the heat exchange of the flue gas water lifting device is normal and the system operation is fault-free, and continue to execute step 201. It is worth noting that the heat exchange ratio threshold can be set according to actual needs, and the embodiment of the present invention does not limit this. The effective heat exchange ratio β is generally between 95% and 100%, and the effective heat exchange ratio parameter β changes in real time during the operation of the flue gas water lifting device.

[0089] Step 205: Generate an early warning signal.

[0090] In the embodiment of the present invention, if a system failure occurs during operation, an early warning signal is generated to prompt the staff to handle the problem, so that abnormal operation of the flue gas water extraction device can be discovered in time, thereby improving the operating reliability of the generator set to a certain extent.

[0091] In the technical solution of the abnormality detection method provided by the embodiment of the present invention, the circulating water heat absorption is generated according to the acquired circulating water flow rate, the inlet temperature of the circulating water inlet and the outlet temperature of the circulating water outlet; the flue gas heat release is generated according to the acquired volume percentage of water vapor, the predetermined dry flue gas volume, the device inlet temperature, the device outlet temperature, the volume percentage of each component in the saturated wet flue gas, the phase change latent heat and the flue gas pressure; the effective heat exchange ratio is generated according to the flue gas heat release and the circulating water heat absorption; if the effective heat exchange ratio is less than the set heat exchange ratio threshold, an early warning signal is generated, which can perform abnormal detection and early warning on the flue gas water lifting device, thereby improving the unit operation reliability.

[0092] Figure 3 A schematic diagram of the structure of an abnormality detection device provided in an embodiment of the present invention, the device is used to perform the above abnormality detection method, such as Figure 3 As shown, the device includes: a first generating unit 11, a second generating unit 12, a third generating unit 13 and an early warning unit 14.

[0093] The first generating unit 11 is used to generate the circulating water heat absorption amount according to the acquired circulating water flow rate, the inlet temperature of the circulating water inlet, and the outlet temperature of the circulating water outlet.

[0094] The second generation unit 12 is used to generate flue gas heat release according to the acquired volume percentage of water vapor, a predetermined dry flue gas volume, a device inlet temperature, a device outlet temperature, a volume percentage of each component in the saturated wet flue gas, a phase change latent heat and a flue gas pressure.

[0095] The third generating unit 13 is used to generate an effective heat exchange ratio according to the heat released by the flue gas and the heat absorbed by the circulating water.

[0096] The early warning unit 14 is used to generate an early warning signal if the effective heat exchange ratio is less than a set heat exchange ratio threshold.

[0097] In the embodiment of the present invention, the second generation unit 12 is specifically used to generate a first flue gas heat release according to the dry flue gas volume, the volume percentage of water vapor, the device inlet temperature, the device outlet temperature and the volume percentage of each component in the saturated wet flue gas; and to generate a second flue gas heat release according to the phase change latent heat, the device inlet temperature, the device outlet temperature and the flue gas pressure. The first flue gas heat release and the second flue gas heat release are added to obtain the flue gas heat release.

[0098] In an embodiment of the present invention, the second generating unit 12 is specifically used to generate an actual volume flow rate of saturated wet flue gas according to the volume percentage of dry flue gas and water vapor; and to generate a first flue gas heat release according to the actual volume flow rate of saturated wet flue gas, the device inlet temperature, the device outlet temperature and the volume percentage of each component in the saturated wet flue gas.

[0099] In an embodiment of the present invention, the second generation unit 12 is specifically used to query the constant-pressure specific heat of each component in the saturated wet flue gas according to the device inlet temperature; calculate the average constant-pressure specific heat according to the constant-pressure specific heat of each component in the saturated wet flue gas and the volume percentage of each component; generate the first flue gas heat release according to the average constant-pressure specific heat, the actual volume flow rate of the saturated wet flue gas, the device inlet temperature and the device outlet temperature.

[0100] In the embodiment of the present invention, the second generation unit 12 is specifically used to generate the amount of flue gas condensate water according to the device inlet temperature, the device outlet temperature and the flue gas pressure through the Antoine equation; and generate the second flue gas heat release according to the phase change latent heat and the flue gas condensate water.

[0101] In the scheme of the embodiment of the present invention, the circulating water heat absorption is generated according to the obtained circulating water flow rate, the inlet temperature of the circulating water inlet and the outlet temperature of the circulating water outlet; the flue gas heat release is generated according to the obtained volume percentage of water vapor, the predetermined dry flue gas volume, the device inlet temperature, the device outlet temperature, the volume percentage of each component in the saturated wet flue gas, the phase change latent heat and the flue gas pressure; the effective heat exchange ratio is generated according to the flue gas heat release and the circulating water heat absorption; if the effective heat exchange ratio is less than the set heat exchange ratio threshold, an early warning signal is generated, which can perform abnormal detection and early warning on the flue gas water lifting device, thereby improving the unit operation reliability.

[0102] The systems, devices, modules or units described in the above embodiments may be implemented by computer chips or entities, or by products with certain functions. A typical implementation device is a computer device, and specifically, the computer device may be, for example, a personal computer, a laptop computer, a cellular phone, a camera phone, a smart phone, a personal digital assistant, a media player, a navigation device, an email device, a game console, a tablet computer, a wearable device, or a combination of any of these devices.

[0103] An embodiment of the present invention provides a computer device, including a memory and a processor, the memory is used to store information including program instructions, the processor is used to control the execution of the program instructions, and the program instructions are loaded and executed by the processor to implement the steps of the embodiment of the above-mentioned anomaly detection method. For a specific description, please refer to the embodiment of the above-mentioned anomaly detection method.

[0104] Reference below Figure 4 , which shows a schematic diagram of the structure of a computer device 600 suitable for implementing an embodiment of the present application.

[0105] like Figure 4As shown, the computer device 600 includes a central processing unit (CPU) 601, which can perform various appropriate operations and processes according to a program stored in a read-only memory (ROM) 602 or a program loaded from a storage part 608 to a random access memory (RAM) 603. In the RAM 603, various programs and data required for the operation of the computer device 600 are also stored. The CPU 601, the ROM 602, and the RAM 603 are connected to each other via a bus 604. An input / output (I / O) interface 605 is also connected to the bus 604.

[0106] The following components are connected to the I / O interface 605: an input section 606 including a keyboard, a mouse, etc.; an output section 607 including a cathode ray tube (CRT), a liquid crystal feedback device (LCD), etc., and a speaker, etc.; a storage section 608 including a hard disk, etc.; and a communication section 609 including a network interface card such as a LAN card, a modem, etc. The communication section 609 performs communication processing via a network such as the Internet. A drive 610 is also connected to the I / O interface 605 as needed. A removable medium 611, such as a magnetic disk, an optical disk, a magneto-optical disk, a semiconductor memory, etc., is installed on the drive 610 as needed, so that a computer program read therefrom is installed as needed as the storage section 608.

[0107] In particular, according to an embodiment of the present invention, the process described above with reference to the flowchart can be implemented as a computer software program. For example, an embodiment of the present invention includes a computer program product, which includes a computer program tangibly contained on a machine-readable medium, and the computer program includes program code for executing the method shown in the flowchart. In such an embodiment, the computer program can be downloaded and installed from a network through the communication part 609, and / or installed from the removable medium 611.

[0108] Computer readable media include permanent and non-permanent, removable and non-removable media that can be implemented by any method or technology to store information. Information can be computer readable instructions, data structures, program modules or other data. Examples of computer storage media include, but are not limited to, phase change memory (PRAM), static random access memory (SRAM), dynamic random access memory (DRAM), other types of random access memory (RAM), read-only memory (ROM), electrically erasable programmable read-only memory (EEPROM), flash memory or other memory technology, compact disk read-only memory (CD-ROM), digital versatile disk (DVD) or other optical storage, magnetic cassettes, magnetic tape magnetic disk storage or other magnetic storage devices or any other non-transmission media that can be used to store information that can be accessed by a computing device. As defined herein, computer readable media does not include temporary computer readable media (transitory media), such as modulated data signals and carrier waves.

[0109] For the convenience of description, the above device is described in various units according to their functions. Of course, when implementing the present application, the functions of each unit can be implemented in the same or multiple software and / or hardware.

[0110] The present invention is described with reference to flowcharts and / or block diagrams of methods, devices (systems), and computer program products according to embodiments of the present invention. It should be understood that each process and / or block in the flowchart and / or block diagram, as well as the combination of processes and / or blocks in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to produce a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 A process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0111] These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing device to operate in a specific manner, so that the instructions stored in the computer-readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 A process or multiple processes and / or boxes Figure 1 A function specified in one or more boxes.

[0112] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operating steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing instructions for implementing the process. Figure 1 A process or multiple processes and / or boxes Figure 1 The steps for the functions specified in one or more boxes.

[0113] It should also be noted that the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, commodity or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, commodity or device. In the absence of more restrictions, the elements defined by the sentence "comprises a ..." do not exclude the existence of other identical elements in the process, method, commodity or device including the elements.

[0114] The acquisition, storage, use, and processing of data in the technical solution of this application comply with the relevant provisions of national laws and regulations.

[0115] Those skilled in the art will appreciate that the embodiments of the present application may be provided as methods, systems or computer program products. Therefore, the present application may adopt the form of a complete hardware embodiment, a complete software embodiment or an embodiment in combination with software and hardware. Moreover, the present application may adopt the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) that contain computer-usable program code.

[0116] The present application may be described in the general context of computer-executable instructions executed by a computer, such as program modules. Generally, program modules include routines, programs, objects, components, data structures, etc. that perform specific tasks or implement specific abstract data types. The present application may also be practiced in distributed computing environments where tasks are performed by remote processing devices connected through a communication network. In a distributed computing environment, program modules may be located in local and remote computer storage media, including storage devices.

[0117] Each embodiment in this specification is described in a progressive manner, and the same or similar parts between the embodiments can be referred to each other, and each embodiment focuses on the differences from other embodiments. In particular, for the system embodiment, since it is basically similar to the method embodiment, the description is relatively simple, and the relevant parts can be referred to the partial description of the method embodiment.

[0118] The above is only an embodiment of the present application and is not intended to limit the present application. For those skilled in the art, the present application may have various changes and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the scope of the claims of the present application.

Claims

1. An anomaly detection method, characterized in that: The method comprises: Generate the circulating water heat absorption amount according to the acquired circulating water flow rate, the inlet temperature of the circulating water inlet and the outlet temperature of the circulating water outlet; Generate flue gas heat release according to the volume percentage of water vapor obtained, the predetermined dry flue gas volume, the device inlet temperature, the device outlet temperature, the volume percentage of each component in the saturated wet flue gas, the latent heat of phase change and the flue gas pressure; generating an effective heat exchange ratio according to the heat released by the flue gas and the heat absorbed by the circulating water; If the effective heat exchange ratio is less than the set heat exchange ratio threshold, a warning signal is generated; The method further comprises: Determine the dry flue gas volume after desulfurization based on the obtained flue gas oxygen content, unit coal consumption, coal quality parameters, gaseous sulfur oxide ratio, denitrification efficiency and desulfurization efficiency; The heat released in the flue gas water extraction process is determined according to the temperature of the flue gas before and after it flows through the flue gas water extraction device. The flue gas heat release includes a first flue gas heat release and a second flue gas heat release. The first flue gas heat release is the sensible heat caused by the temperature reduction of the saturated wet flue gas, and the second flue gas heat release is the latent heat released by the condensation of liquid water from the saturated wet flue gas.

2. The anomaly detection method according to claim 1, characterized in that: The method of generating the flue gas heat release according to the volume percentage of the obtained water vapor, the predetermined dry flue gas volume, the device inlet temperature, the device outlet temperature, the volume percentage of each component in the saturated wet flue gas, the phase change latent heat and the flue gas pressure includes: Generate a first flue gas heat release according to the dry flue gas volume, the volume percentage of the water vapor, the device inlet temperature, the device outlet temperature and the volume percentage of each component in the saturated wet flue gas; generating a second flue gas heat release according to the phase change latent heat, the device inlet temperature, the device outlet temperature and the flue gas pressure; The first flue gas heat release and the second flue gas heat release are added to obtain the flue gas heat release.

3. The anomaly detection method according to claim 2, characterized in that: The step of generating a first flue gas heat release according to the dry flue gas volume, the volume percentage of the water vapor, the device inlet temperature, the device outlet temperature and the volume percentage of each component in the saturated wet flue gas comprises: generating an actual volume flow rate of saturated wet flue gas according to the dry flue gas volume and the volume percentage of the water vapor; The first flue gas heat release is generated according to the actual volume flow rate of the saturated wet flue gas, the device inlet temperature, the device outlet temperature and the volume percentage of each component in the saturated wet flue gas.

4. The anomaly detection method according to claim 3, characterized in that: The step of generating a first flue gas heat release according to the actual volume flow rate of the saturated wet flue gas, the device inlet temperature, the device outlet temperature and the volume percentage of each component in the saturated wet flue gas comprises: According to the inlet temperature of the device, the constant pressure specific heat of each component in the saturated wet flue gas is queried; According to the constant pressure specific heat of each component in the saturated wet flue gas and the volume percentage of each component, the average constant pressure specific heat is calculated; The first flue gas heat release amount is generated according to the average constant-pressure specific heat, the actual volume flow rate of the saturated wet flue gas, the device inlet temperature and the device outlet temperature.

5. The abnormality detection method according to claim 2, characterized in that: The step of generating a second flue gas heat release according to the phase change latent heat, the device inlet temperature, the device outlet temperature and the flue gas pressure comprises: The amount of flue gas condensate is generated based on the device inlet temperature, device outlet temperature and flue gas pressure through the Antoine equation; A second flue gas heat release amount is generated according to the phase change latent heat and the amount of condensed water in the flue gas.

6. An abnormality detection device, characterized in that: The device comprises: A first generating unit is used to generate a circulating water heat absorption amount according to the acquired circulating water flow rate, the inlet temperature of the circulating water inlet, and the outlet temperature of the circulating water outlet; The second generating unit is used to generate the flue gas heat release according to the volume percentage of the obtained water vapor, the predetermined dry flue gas volume, the device inlet temperature, the device outlet temperature, the volume percentage of each component in the saturated wet flue gas, the phase change latent heat and the flue gas pressure; A third generating unit, used for generating an effective heat exchange ratio according to the heat released by the flue gas and the heat absorbed by the circulating water; An early warning unit, used to generate an early warning signal if the effective heat exchange ratio is less than a set heat exchange ratio threshold; The device also includes: The dry flue gas volume determination unit is used to determine the dry flue gas volume after desulfurization based on the obtained flue gas oxygen content, unit coal consumption, coal quality parameters, gaseous sulfur oxide ratio, denitrification efficiency and desulfurization efficiency; The second generation unit is specifically used to determine the heat released in the flue gas water extraction process according to the temperature before and after the flue gas flows through the flue gas water extraction device, wherein the flue gas heat release includes a first flue gas heat release and a second flue gas heat release, wherein the first flue gas heat release is the sensible heat caused by the temperature reduction of the saturated wet flue gas, and the second flue gas heat release is the latent heat released by the condensation of liquid water from the saturated wet flue gas.

7. The abnormality detection device according to claim 6, characterized in that: The second generating unit is specifically used to generate a first flue gas heat release according to the dry flue gas volume, the volume percentage of the water vapor, the device inlet temperature, the device outlet temperature and the volume percentage of each component in the saturated wet flue gas; generate a second flue gas heat release according to the phase change latent heat, the device inlet temperature, the device outlet temperature and the flue gas pressure; and add the first flue gas heat release and the second flue gas heat release to obtain the flue gas heat release.

8. The abnormality detection device according to claim 7, characterized in that: The second generating unit is specifically used to generate an actual volume flow rate of saturated wet flue gas according to the dry flue gas volume percentage and the water vapor volume percentage; and to generate a first flue gas heat release according to the actual volume flow rate of saturated wet flue gas, the device inlet temperature, the device outlet temperature and the volume percentage of each component in the saturated wet flue gas.

9. A computer readable medium having a computer program stored thereon, characterized in that: When the program is executed by a processor, the abnormality detection method according to any one of claims 1 to 5 is implemented.

10. A computer device comprising a memory and a processor, wherein the memory is used to store information including program instructions, and the processor is used to control the execution of the program instructions, characterized in that: When the program instructions are loaded and executed by the processor, the anomaly detection method according to any one of claims 1 to 5 is implemented.

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