Economizer cleaning early warning method based on flue state and related equipment
By using an automated cleaning and early warning method based on flue gas conditions, and dynamically monitoring economizer ash accumulation using pressure drop, temperature, and viscosity characteristics, the high safety risks and low production efficiency of traditional manual cleaning methods are solved, achieving safe and efficient cleaning control.
Patent Information
- Application Number
- CN202511490889.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-10-17
- Publication Date
- 2026-01-23
AI Technical Summary
Traditional manual cleaning of low-temperature economizer flues presents problems of high safety risks and low production efficiency, especially when cleaning in confined spaces, which poses a great threat to personnel safety and consumes a lot of production time.
By acquiring the pressure drop parameters, flue gas temperature parameters, and viscosity characteristics of the heated surface in the economizer flue, a cleaning early warning is automatically triggered. The thermal resistance of ash accumulation is determined by using the ammonia escape rate monitoring value and heat transfer coefficient of the SCR system. Combined with the flue gas flow fitting relationship, dynamic monitoring is performed, and cleaning is automatically triggered when the congestion coefficient reaches the set conditions.
It enables dynamic monitoring and control of the low-temperature economizer under complex operating conditions, avoiding the decline in heat exchange efficiency caused by failure to clean in time, reducing safety risks and improving production efficiency.
Smart Images
Figure CN121383214A_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The present application relates to the technical field of economizers, and in particular to an economizer cleaning early warning method based on flue conditions and related equipment. BACKGROUND
[0002] As one of the core equipment for energy saving and carbon reduction in domestic coal-fired power plants, the low-temperature economizer occupies an important position in the tail flue gas treatment of coal-fired power plants. However, due to unreasonable flue settings, some coal-fired power plants cause low-temperature economizer flue ash accumulation, thereby affecting the heat exchange effect of the low-temperature economizer.
[0003] Currently, the traditional low-temperature economizer flue cleaning mainly relies on periodic manual inspection to obtain the flue ash accumulation state, and performs flue cleaning based on subjective experience. However, since the flue is a typical confined space, there is a risk of oxygen deficiency and accumulation of toxic and harmful gases, and the dust concentration generated during the cleaning process is extremely high, which can easily cause safety risks to the cleaning personnel. At the same time, manual cleaning must be performed when the equipment is completely shut down and cooled. The entire process from shutdown, cooling, hole ventilation, cleaning, acceptance, and restart occupies a large amount of effective production time, and seriously affects the power generation or production efficiency. SUMMARY
[0004] The present application provides an economizer cleaning early warning method based on flue conditions to solve the problems of high safety risk and low production efficiency in the traditional manual cleaning method.
[0005] The present application also provides an economizer cleaning early warning device based on flue conditions, an electronic device, a computer-readable storage medium, and a computer program product.
[0006] The present application adopts the following technical solutions: In a first aspect, the present application provides an economizer cleaning early warning method based on flue conditions, comprising: obtaining a pressure drop parameter, a flue gas temperature parameter of the economizer flue, and a first viscosity feature for representing the viscosity of the heated surface of the economizer; determining the ash distribution balance value of the economizer flue according to the first viscosity feature and the pressure drop parameter; determining the congestion coefficient of the economizer according to the flue gas temperature parameter and the ash distribution balance value; when the congestion coefficient of the economizer meets the set cleaning early warning condition of the economizer, automatically triggering the cleaning early warning of the economizer.
[0007] Optionally, the economizer cleaning early warning method based on flue conditions further comprises: obtaining an ammonia slip rate monitoring value of the SCR system, a reference heat transfer coefficient under a clean state of the heated surface, and an actual heat transfer coefficient. According to the reference heat transfer coefficient and the actual heat transfer coefficient, a growth rate index of the total fouling thermal resistance of the heating surface is determined; According to the ammonia escape rate monitoring value and the growth rate index of the total fouling thermal resistance of the heating surface, a first stickiness feature for representing the stickiness of the heating surface of the economizer is determined.
[0008] Optionally, according to the ammonia escape rate monitoring value and the growth rate index of the total fouling thermal resistance of the heating surface, the first stickiness feature for representing the stickiness of the heating surface of the economizer is determined, including: According to the relationship between the ammonia escape rate monitoring value and the set first working condition judgment condition and second working condition judgment condition, a first weight value of the growth rate index of the total fouling thermal resistance of the heating surface is determined; According to the first weight value and the ammonia escape rate monitoring value, the first stickiness feature for representing the stickiness of the heating surface of the economizer is determined.
[0009] Optionally, according to the first stickiness feature and the pressure drop parameter, a fouling distribution balance value of the flue of the economizer is determined, including: According to the pressure drop parameter and the theoretical pressure drop value, a pressure drop distribution factor is obtained; Based on a set adjustment coefficient, a numerical range of the first stickiness feature is mapped to a weight interval to obtain a stickiness stability factor; According to the pressure drop distribution factor and the stickiness stability factor, the fouling distribution balance value of the flue of the economizer is obtained.
[0010] Optionally, according to the first stickiness feature and the pressure drop parameter, the fouling distribution balance value of the flue of the economizer is determined, and further including: Based on the obtained flue gas flow of the flue of the economizer, a fitting relationship between the clean pressure drop and the flue gas flow is constructed to determine the theoretical pressure drop value; Correspondingly, the fitting relationship between the clean pressure drop and the flue gas flow is constructed to determine the theoretical pressure drop value, and further including: In a clean state of the economizer, the corresponding flue gas flow and the measured clean pressure drop of each stable load point are obtained; Based on a positive proportional relationship between the clean pressure drop and the square of the flue gas flow, a fitting relationship between the clean pressure drop and the flue gas flow is established.
[0011] Optionally, the flue gas temperature parameter includes: inlet flue gas temperature and outlet flue gas temperature, and according to the flue gas temperature parameter and the fouling distribution balance value, a congestion coefficient of the economizer is determined, including: According to the inlet flue gas temperature and the outlet flue gas temperature, a flue gas temperature drop index is determined; According to the flue gas temperature drop index and the fouling distribution balance value, the congestion coefficient of the economizer is determined.
[0012] In a second aspect, the application provides a coal economizer cleaning early warning device based on flue conditions, comprising an acquisition module, a first determination module, a second determination module, and a triggering module, wherein: The acquisition module is configured to acquire a pressure drop parameter and a flue gas temperature parameter of the flue of the coal economizer, and a first viscosity feature representing the viscosity of the heating surface of the coal economizer; The first determination module is configured to determine an ash deposition distribution balance value of the flue of the coal economizer according to the first viscosity feature and the pressure drop parameter; The second determination module is configured to determine a congestion coefficient of the coal economizer according to the flue gas temperature parameter and the ash deposition distribution balance value; The triggering module is configured to automatically trigger a cleaning early warning of the coal economizer when the congestion coefficient of the coal economizer meets a set cleaning early warning condition of the coal economizer.
[0013] Optionally, the acquisition module comprises: The acquisition unit is configured to acquire an ammonia slip rate monitoring value of the SCR system, a reference heat transfer coefficient under a clean state of the heating surface, and an actual heat transfer coefficient; The growth rate index determination unit is configured to determine a growth rate index of the total ash deposition thermal resistance of the heating surface according to the reference heat transfer coefficient and the actual heat transfer coefficient; The first viscosity feature determination unit is configured to determine the first viscosity feature representing the viscosity of the heating surface of the coal economizer according to the ammonia slip rate monitoring value and the growth rate index of the total ash deposition thermal resistance of the heating surface.
[0014] Optionally, the first viscosity feature determination unit is configured to: determine a first weight value of the growth rate index of the total ash deposition thermal resistance of the heating surface according to a relationship between the ammonia slip rate monitoring value and set first and second working condition determination conditions; determine the first viscosity feature representing the viscosity of the heating surface of the coal economizer according to the first weight value and the ammonia slip rate monitoring value.
[0015] Optionally, the first determination module is configured to: obtain a pressure drop distribution factor according to the pressure drop parameter and a theoretical pressure drop value; map a numerical range of the first viscosity feature to a weight interval based on a set adjustment coefficient to obtain a viscosity stability factor; obtain the ash deposition distribution balance value of the flue of the coal economizer according to the pressure drop distribution factor and the viscosity stability factor.
[0016] Optionally, the first determination module is configured to: determine the theoretical pressure drop value based on the acquired flue gas flow of the flue of the coal economizer through a constructed fitting relationship between the clean pressure drop and the flue gas flow; Correspondingly, the determination of the theoretical pressure drop value through the constructed fitting relationship between the clean pressure drop and the flue gas flow further comprises: In the state of the economizer cleaning, the flue gas flow and the measured cleaning pressure drop corresponding to each stable load point are obtained; Based on the proportional relationship between the cleaning pressure drop and the square of the flue gas flow, a fitting relationship between the cleaning pressure drop and the flue gas flow is established.
[0017] Optionally, the flue gas temperature parameters include: inlet flue gas temperature and outlet flue gas temperature, and the second determining module is configured to: determine a flue gas temperature drop index according to the inlet flue gas temperature and the outlet flue gas temperature; determine a congestion coefficient of the economizer according to the flue gas temperature drop index and the ash deposition distribution balance value.
[0018] In a third aspect, the present application provides an electronic device, comprising: a memory, a processor, and a computer program stored in the memory and executable on the processor, and when the computer program is executed by the processor, the steps of the economizer cleaning early warning method based on the flue state are implemented.
[0019] In a fourth aspect, the present application provides a computer readable storage medium, and the computer readable storage medium stores a computer program, and when the computer program is executed by a processor, the steps of the economizer cleaning early warning method based on the flue state are implemented.
[0020] In a fifth aspect, the present application provides a computer program product, comprising a computer program, and when the computer program is executed by a processor, the economizer cleaning early warning method based on the flue state is implemented.
[0021] The above-mentioned at least one technical solution adopted by the embodiments of the present application can achieve the following beneficial effects: By using the method provided by the embodiments of the present application, the pressure drop parameters of the economizer flue, the flue gas temperature parameters, and the first viscosity feature for representing the viscosity of the heating surface of the economizer can be obtained; then the ash deposition distribution balance value of the economizer flue is determined according to the first viscosity feature and the pressure drop parameters; and then the congestion coefficient of the economizer is determined according to the flue gas temperature parameters and the ash deposition distribution balance value; so that the cleaning early warning of the economizer can be automatically triggered when the congestion coefficient of the economizer meets the set cleaning early warning condition of the economizer. In this way, the dynamic monitoring and control of the low-temperature economizer can be realized under complex fluctuating conditions, the influence of the non-timely cleaning on the heat exchange effect of the economizer can be effectively avoided, and the problems of high safety risk and low production efficiency existing in the traditional manual cleaning mode in the prior art can be solved. BRIEF DESCRIPTION OF DRAWINGS
[0022] The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this application, illustrate embodiments of the application and together with the description serve to explain the application. In the drawings: Figure 1 An implementation flow diagram of a flue gas state-based economizer cleaning early warning method provided by an embodiment of the application is shown in FIG. 1. Figure 2 A specific structure diagram of a flue gas state-based economizer cleaning early warning device provided by an embodiment of the application is shown in FIG. 2. Figure 3 A structure diagram of an electronic device provided by an embodiment of the application is shown in FIG. 3. DETAILED DESCRIPTION
[0023] To make the objects, technical solutions, and advantages of the application clearer, the following will combine the embodiments of the application and the corresponding drawings to clearly and completely describe the technical solutions of the application. Obviously, the described embodiments are only some of the embodiments of the application, but not all the embodiments of the application. Based on the embodiments in the application, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the scope of protection of the application.
[0024] Those of ordinary skill in the art can know that, with the development of technology and the appearance of new scenarios, the technical solutions provided by the embodiments of the application are also applicable to similar technical problems.
[0025] The terms "first", "second", and the like in the specification and claims of the application and the above-mentioned drawings are used to distinguish similar objects, and do not necessarily indicate a specific order or sequence. It should be understood that the terms used in this way can be interchanged under appropriate circumstances, which is only a distinguishing way used in the description of the embodiments of the application to describe the objects with the same attributes.
[0026] The following will combine the drawings to specifically describe the technical solutions provided by the embodiments of the application.
[0027] Embodiment 1 To solve the problems of high safety risk and low production efficiency of the traditional manual cleaning method in the prior art, an embodiment of the application provides a flue gas state-based economizer cleaning early warning method.
[0028] Specifically, the implementation flow of the method provided by the embodiment of the application is as shown in FIG. 1, and includes the following steps. Figure 1 Step 11, obtaining a pressure drop parameter of an economizer flue, a flue gas temperature parameter, and a first viscosity feature for characterizing a viscosity of a heating surface of the economizer.
[0029] The first viscosity characteristic can represent the viscosity of the heating surface of the economizer.
[0030] For sampling analysis of the ash deposition in the flue of the low-temperature economizer, it is found that the reasons for the ash deposition and blockage of the low-temperature economizer mainly include the following two aspects: (1) Caking ash. This is mainly caused by ammonia escape of the upstream equipment. The ash ions in the flue gas adsorb a large amount of sulfate and sulfite. When the flue gas temperature decreases, the sulfate and sulfite react with the ammonium ions of the ammonia escape to generate ammonium bisulfate or ammonium bisulfite with strong viscosity. These ammonium bisulfate and ammonium bisulfite are deposited or condensed on the heating surface of the low-temperature economizer together with the dust particles in the flue gas, thereby forming caking ash that is difficult to clean.
[0031] (2) Floating ash. The dust in the flue gas deposits as floating ash in the downstream. This is mainly because the fly ash particles with a particle size less than 30 μm naturally settle during the movement of the flue gas to the downstream equipment, and form loose and dry loose floating ash on the surface of the flue and the low-temperature economizer. A large amount of ash adheres to the heating surface of the economizer, thereby forming a large thermal resistance and greatly affecting the heat exchange of the low-temperature economizer.
[0032] Based on the above analysis results, the economizer cleaning early warning method based on the flue state provided in the application takes the viscosity index of the heating surface of the economizer as the first viscosity characteristic, which is used as a trigger factor for controlling the economizer cleaning early warning, so that the cleaning time can be more accurately controlled and the self-cleaning effect of the economizer can be improved.
[0033] Specifically, the determination step of the first viscosity characteristic is as follows: The ammonia escape rate monitoring value of the SCR system, the reference heat transfer coefficient and the actual heat transfer coefficient under the clean state of the heating surface are obtained. The growth rate index of the total ash deposition thermal resistance of the heating surface is determined according to the reference heat transfer coefficient and the actual heat transfer coefficient. The first viscosity characteristic representing the viscosity of the heating surface of the economizer is determined according to the ammonia escape rate monitoring value and the growth rate index of the total ash deposition thermal resistance of the heating surface.
[0034] In the above steps, the real-time ammonia escape concentration value directly read from the laser gas analyzer at the outlet of the SCR system is taken as the ammonia escape rate monitoring value. If the measurement value is unreliable, the soft measurement estimated value based on the SCR model (ammonia injection amount, inlet NOx concentration, catalyst activity, etc.) can be used as a supplement. For the reference heat transfer coefficient under the clean state of the heating surface, the heat transfer coefficient under the rated working condition provided by the design drawing of the economizer can be used. For the actual heat transfer coefficient, the heat absorption Q on the working medium side (determined by measuring the flow, inlet temperature and outlet temperature of the working medium (water) of the economizer), the total heat transfer area and the logarithmic mean temperature difference can be used to determine.
[0035] According to heat transfer, the ash deposition thermal resistance is the difference between the actual total thermal resistance and the total thermal resistance in the clean state. Correspondingly, the calculation formula of the growth rate index of the total ash deposition thermal resistance of the heating surface is as follows:
[0036] wherein, is the current time, is the last calculation time, is the calculation period, is the current total ash deposition thermal resistance at time , and is the total ash deposition thermal resistance at the last calculation time.
[0037] Specifically, according to the ammonia escape rate monitoring value and the growth rate index of the total ash deposition thermal resistance of the heating surface, a first stickiness feature for representing the stickiness of the heating surface of the economizer is determined, which comprises: According to the relationship between the ammonia escape rate monitoring value and the set first working condition judgment condition and second working condition judgment condition, a first weight value of the growth rate index of the total ash deposition thermal resistance of the heating surface is determined; According to the first weight value and the ammonia escape rate monitoring value, a first stickiness feature for representing the stickiness of the heating surface of the economizer is determined.
[0038] The first working condition judgment condition (ammonia escape condition): (for example, ); The second working condition judgment condition (temperature window condition): (unit: ℃).
[0039] When the ammonia escape rate monitoring value meets the first working condition judgment condition and the second working condition judgment condition at the same time, the first weight value is determined as M, and the value range of M is [ ], and a value selected from the value range in a random manner is used as the first weight value of the ammonia escape monitoring value.
[0040] When the ammonia escape rate monitoring index cannot meet the first working condition judgment condition and the second working condition judgment condition at the same time, the first weight value is determined as N, and the value range of M is ( ), and a value selected from the value range in a random manner is used as the first weight value of the ammonia escape monitoring value.
[0041] Step 12, according to the first stickiness feature and the pressure drop parameter, the ash deposition distribution balance value of the economizer flue is determined.
[0042] Specifically, the step 12 comprises the following steps: (1) According to the pressure drop parameter and the theoretical pressure drop value, a pressure drop distribution factor is obtained; In the embodiments of the application, based on the obtained flue gas flow of the economizer flue, the theoretical pressure drop value can be determined through the fitting relationship of the clean pressure drop and the flue gas flow constructed. The step of constructing the fitting relationship of the clean pressure drop and the flue gas flow includes: In the state of cleaning of the economizer, the flue gas flow corresponding to each stable load point and the measured clean pressure drop are obtained; based on the positive proportional relationship between the clean pressure drop and the square of the flue gas flow, the fitting relationship of the clean pressure drop and the flue gas flow is established.
[0043] In the state of cleaning of the economizer after the unit overhaul, the unit is stably operated at different load points (such as 100%, 80%, and 60% load), and the flue gas flow (or unit load) corresponding to each stable load point and the measured clean pressure drop are recorded. Through the positive proportionality between the clean pressure drop and the square of the flow, the fitting formula of the clean pressure drop and the flue gas flow can be obtained, so as to construct the fitting relationship.
[0044] Fitting formula:
[0045] Wherein, is the clean pressure drop, , is the flue gas flow.
[0046] Pressure drop distribution factor Calculation formula of the pressure drop distribution factor:
[0047] Wherein, is the real-time measured pressure drop on the flue gas side of the economizer, is the theoretical pressure drop in the ideal clean state under the current working condition.
[0048] (2) Based on the set adjustment coefficient, the numerical range of the first viscous feature is mapped to the weight interval to obtain the viscous stability factor; The adjustment coefficient (K) is used to map the numerical range of the first viscous feature (FVC) to a reasonable weight interval, for example, FVC is about 0.1-0.5, which can be set to 2.
[0049] Specifically, it can be expressed as:
[0050] (3) According to the pressure drop distribution factor and the viscous stability factor, the ash deposition distribution balance value of the economizer flue is obtained.
[0051] Correspondingly, the calculation formula of the ash deposition distribution balance value E is as follows:
[0052] wherein, and is a set weighting value, satisfying + =1.
[0053] Step 13, determining the congestion coefficient of the economizer according to the flue gas temperature parameter and the ash deposition distribution balance value; Specifically, the flue gas temperature parameter includes: the inlet flue gas temperature and the outlet flue gas temperature, and the congestion coefficient of the economizer is determined according to the flue gas temperature parameter and the ash deposition distribution balance value, including: determining the flue gas temperature drop index according to the inlet flue gas temperature and the outlet flue gas temperature; determining the congestion coefficient of the economizer according to the flue gas temperature drop index and the ash deposition distribution balance value.
[0054] In the embodiment of the application, the flue gas temperature drop index is the difference between the inlet flue gas temperature and the outlet flue gas temperature. The flue gas temperature drop index is multiplied by the normalized ash deposition distribution balance value E to obtain the final congestion coefficient.
[0055] Through the above-mentioned manner, even if the ash deposition distribution is not uniform (E value is medium), but if the flue gas temperature drop index is high and the heat exchange effect is significant, the overall risk (C) is still controllable; on the contrary, even if the ash deposition distribution is acceptable (E value is medium), but if the heat exchange effect is low, the overall risk (C) will be significantly magnified. The most dangerous situation is that the ash deposition distribution is seriously uneven (E value is low) and the temperature drop index is low at the same time, at this time, the C value will be sharply reduced, and the highest level of alarm is issued.
[0056] Step 14, when the congestion coefficient of the economizer meets the set cleaning warning condition of the economizer, automatically triggering the cleaning warning of the economizer.
[0057] The set cleaning warning condition of the economizer is as follows: When the congestion coefficient C is greater than or equal to 0.6, the corresponding risk level is safe (normal), and the system action suggestion is: normal monitoring, normal soot blowing; When the congestion coefficient C is greater than or equal to 0.4 and less than 0.6, the corresponding risk level is attention (low-level warning), and the system action suggestion is: issuing a prompt, strengthening monitoring, and automatically increasing the soot blowing frequency moderately; When the congestion coefficient C is greater than or equal to 0.2 and less than 0.4, the corresponding risk level is warning (medium-level warning), and the system action suggestion is: issuing an audible and visual alarm, prompting “high congestion risk”, automatically starting a high-intensity soot blowing program, and suggesting the operator to check the fuel and SCR operation status; When the congestion coefficient C is less than 0.2, the corresponding risk level is dangerous (high level early warning), and the system action suggestion is: the highest level alarm, and the system should suggest or even automatically interlock to reduce the boiler load to increase the flue gas temperature and the working medium temperature.
[0058] By using the method provided in the embodiments of the present application, the pressure drop parameter and the flue gas temperature parameter of the economizer flue can be obtained, and the first viscosity feature for representing the viscosity of the heating surface of the economizer can be obtained; then, the ash deposition distribution balance value of the economizer flue is determined according to the first viscosity feature and the pressure drop parameter; and then, the congestion coefficient of the economizer is determined according to the flue gas temperature parameter and the ash deposition distribution balance value; thereby, the cleaning early warning of the economizer can be automatically triggered when the congestion coefficient of the economizer meets the set cleaning early warning condition of the economizer. In this way, the dynamic monitoring and control of the low-temperature economizer can be realized under complex fluctuation conditions, the influence of the non-timely cleaning on the heat exchange effect of the economizer can be effectively avoided, and the problems of high safety risk and low production efficiency of the traditional manual cleaning mode in the prior art can be solved.
[0059] Embodiment 2 To solve the problems of high safety risk and low production efficiency of the traditional manual cleaning mode in the prior art, the embodiments of the present application provide an economizer cleaning early warning device based on the flue state, and a specific structure diagram of the device is as shown in Figure 2 The functions of each module are as follows: The acquisition module 21 is configured to acquire the pressure drop parameter and the flue gas temperature parameter of the economizer flue, and acquire the first viscosity feature for representing the viscosity of the heating surface of the economizer. The first determination module 22 is configured to determine the ash deposition distribution balance value of the economizer flue according to the first viscosity feature and the pressure drop parameter. The second determination module 23 is configured to determine the congestion coefficient of the economizer according to the flue gas temperature parameter and the ash deposition distribution balance value. The triggering module 24 is configured to automatically trigger the cleaning early warning of the economizer when the congestion coefficient of the economizer meets the set cleaning early warning condition of the economizer.
[0060] Optionally, the acquisition module 21 comprises: an acquisition unit configured to acquire the ammonia escape rate monitoring value of the SCR system, the reference heat transfer coefficient and the actual heat transfer coefficient under the cleaning state of the heating surface; a growth rate index determination unit configured to determine the growth rate index of the total ash deposition thermal resistance of the heating surface according to the reference heat transfer coefficient and the actual heat transfer coefficient; and a first viscosity feature determination unit configured to determine the first viscosity feature for representing the viscosity of the heating surface of the economizer according to the ammonia escape rate monitoring value and the growth rate index of the total ash deposition thermal resistance of the heating surface.
[0061] Optionally, the first viscosity feature determination unit is configured to: determine a first weight value of the growth rate index of the total fouling thermal resistance of the heating surface according to a relationship between the ammonia escape rate monitoring value and the set first working condition determination condition and the second working condition determination condition; and determine the first viscosity feature for representing the viscosity of the heating surface of the economizer according to the first weight value and the ammonia escape rate monitoring value.
[0062] Optionally, the first determination module 22 is configured to: obtain a pressure drop distribution factor according to the pressure drop parameter and the theoretical pressure drop value; map a numerical range of the first viscosity feature to a weight interval to obtain a viscosity stability factor based on a set adjustment coefficient; and obtain the fouling distribution balance value of the flue of the economizer according to the pressure drop distribution factor and the viscosity stability factor.
[0063] Optionally, the first determination module 22 is configured to: determine the theoretical pressure drop value by constructing a fitting relationship between the clean pressure drop and the flue gas flow based on the obtained flue gas flow of the flue of the economizer; and correspondingly, determine the theoretical pressure drop value by constructing the fitting relationship between the clean pressure drop and the flue gas flow, which further includes: obtaining the flue gas flow corresponding to each stable load point and the measured clean pressure drop in a state of cleaning of the economizer; and establishing the fitting relationship between the clean pressure drop and the flue gas flow based on a direct proportional relationship between the clean pressure drop and the square of the flue gas flow.
[0064] Optionally, the flue gas temperature parameter includes: an inlet flue gas temperature and an outlet flue gas temperature, and the second determination module is configured to: determine a flue gas temperature drop index according to the inlet flue gas temperature and the outlet flue gas temperature; and determine the congestion coefficient of the economizer according to the flue gas temperature drop index and the fouling distribution balance value.
[0065] By using the device provided in the embodiments of the present application, the pressure drop parameter of the flue of the economizer, the flue gas temperature parameter, and the first viscosity feature for representing the viscosity of the heating surface of the economizer can be obtained; then the fouling distribution balance value of the flue of the economizer is determined according to the first viscosity feature and the pressure drop parameter; and then the congestion coefficient of the economizer is determined according to the flue gas temperature parameter and the fouling distribution balance value; so that the cleaning warning of the economizer can be automatically triggered when the congestion coefficient of the economizer meets the set cleaning warning condition of the economizer. In this way, the dynamic monitoring and control of the low-temperature economizer can be realized under complex fluctuation working conditions, the influence of the heat exchange effect of the economizer due to the failure of timely cleaning can be effectively avoided, and the problems of high safety risk and low production efficiency caused by the traditional manual cleaning mode in the prior art can be solved.
[0066] Embodiment 3 Figure 3A schematic diagram of a hardware structure of an electronic device for implementing various embodiments of the present application can include a processor 301 and a memory 302 having stored computer program instructions. Specifically, the processor 301 can include a central processing unit (CPU), or an application specific integrated circuit (ASIC), or one or more integrated circuits configured to implement embodiments of the present application.
[0067] The memory 302 can include a mass storage for data or instructions. By way of example and not limitation, the memory 302 can include a hard disk drive (HDD), a floppy disk drive, a flash memory, an optical disk, a magneto-optical disk, a magnetic tape, or a universal serial bus (USB) drive or a combination of two or more of these. The memory 302 can include removable or non-removable (or fixed) media, where appropriate. The memory 302 can be internal or external to the electronic device, where appropriate. In particular embodiments, the memory 302 can be a non-volatile solid-state memory.
[0068] In one embodiment, the memory 302 can be a read-only memory (ROM). In one embodiment, the ROM can be a mask-programmed ROM, a programmable ROM (PROM), an erasable PROM (EPROM), an electrically erasable PROM (EEPROM), an electrically alterable ROM (EAROM), or a flash memory, or a combination of two or more of these.
[0069] The processor 301 implements any of the above-described methods of flue gas state-based economizer cleaning pre-warning by reading and executing the computer program instructions stored in the memory 302.
[0070] In one example, the electronic device can further include a communication interface 303 and a bus 310. As shown, the processor 301, the memory 302, and the communication interface 303 are connected through the bus 310 and complete communication therebetween. Figure 3
[0071] The communication interface 303 is mainly used to implement communication between various modules, devices, units, and / or equipment in embodiments of the present application.
[0072] Bus 310 includes hardware, software, or both, to couple electronic devices to each other in a manner that allows information to be passed between or among the coupled devices. By way of example, and not limitation, a bus can include an Accelerated Graphics Port (AGP) or other graphics bus, an Enhanced Industry Standard Architecture (EISA) bus, a Front Side Bus (FSB), a HyperTransport (HT) interconnect, an Industry Standard Architecture (ISA) bus, an InfiniBand (IB) interconnect, a Low Pin Count (LPC) bus, a memory bus, a Micro Channel Architecture (MCA) bus, a Peripheral Component Interconnect (PCI) bus, a PCI-Express (PCI-X) bus, a Serial Advanced Technology Attachment (SATA) bus, a Video Electronics Standards Association Local (VLB) bus, or some other suitable bus or a combination of buses, as well as or in place of the buses described above. Bus 310 may, in some aspects, include one or more buses. Although the example embodiments described and illustrated herein relate to a particular bus, the present application contemplates any suitable bus or interconnect.
[0073] In addition, in combination with the flue state-based economizer cleaning early warning method in the above-described embodiments, the present application can provide a computer readable storage medium to implement. The computer readable storage medium has computer program instructions stored thereon; the computer program instructions are executed by the processor to implement any one of the flue state-based economizer cleaning early warning methods in the above-described embodiments.
[0074] It needs to be clear that the present application is not limited to the specific configurations and processes described above and shown in the drawings. For the sake of brevity, detailed descriptions of well-known methods are omitted here. In the above-described embodiments, several specific steps are described and shown as examples. However, the method processes of the present application are not limited to the specific steps described and shown, and those skilled in the art can make various changes, modifications and additions, or change the order between steps, after understanding the spirit of the present application.
[0075] The above is only a specific implementation of the examples of the present application, and those skilled in the art can clearly understand that, for the convenience and brevity of description, the specific working process of the above-described system, module and unit can refer to the corresponding process in the foregoing method embodiments, which will not be described here.
[0076] Secondly, those skilled in the art should understand that the embodiments of the present application can be provided as a method, a system, or a computer program product. Therefore, the present application can adopt a complete hardware embodiment, a complete software embodiment, or an embodiment combining software and hardware aspects. Moreover, the present application can 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.) containing computer usable program code.
[0077] The computer program instructions can also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer-implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart block or blocks. Figure 1 one or more flow or blocks Figure 1 means for functionally implementing the steps listed in the flowchart block or blocks.
[0078] These computer program instructions can also be stored in a computer readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer readable memory produce an article of manufacture including instructions which implement the function specified in the flowchart block or blocks. Figure 1 one or more flow or blocks Figure 1 means for functionally implementing the steps listed in the flowchart block or blocks.
[0079] The computer program instructions can also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer-implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart block or blocks. Figure 1 one or more flow or blocks Figure 1 means for functionally implementing the steps listed in the flowchart block or blocks.
[0080] In a typical configuration, a computing device includes one or more processors (CPUs), input / output interfaces, network interfaces, and memory.
[0081] The memory can include non-persistent memory and / or volatile memory, such as random access memory (RAM) and / or cache memory, non-volatile memory, such as read-only memory (ROM), optical or optical disk storage, flash memory, etc. In one example, the memory can include one or more components or devices provided by or known as a computer-readable medium. The memory can be tangible and non-transitory. The memory can be an example of computer-readable storage media (also referred to as a computer-readable storage device).
[0082] Computer-readable media includes permanent and non-permanent, movable and non-movable media that can implement information storage by any method or technology. The 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 technologies, compact disc read-only memory (CD-ROM), digital versatile disc (DVD) or other optical storage, magnetic cassette, magnetic tape, magnetic disk storage or other magnetic storage devices, or any other non-transmission medium that can be used to store information accessible to a computing device. According to the definition herein, computer-readable media does not include transitory media such as modulated data signals and carriers.
[0083] It should also be noted that the terms "comprising", "containing", or any other variant thereof are intended to cover a non-exclusive inclusion, such that a process, method, article or apparatus that comprises a list of elements does not only include those elements, but can also include other elements not expressly listed or inherent to such process, method, article or apparatus. Without more limitations, the element defined by the statement "comprising a" does not exclude the presence of additional identical elements in the process, method, article or apparatus that includes the element.
[0084] The above only describes the embodiments of the present application and is not intended to limit the present application. For those skilled in the art, the present application can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. within the spirit and principle of the present application shall be included in the scope of claims of the present application.
Claims
1. A method for early warning of economizer cleaning based on flue gas duct status, characterized in that, include: Obtain the pressure drop parameters, flue gas temperature parameters, and a first viscosity characteristic used to characterize the viscosity of the heated surface of the economizer in the economizer flue. Based on the first viscosity characteristic and the pressure drop parameter, determine the ash distribution equilibrium value of the economizer flue; The congestion coefficient of the economizer is determined based on the flue gas temperature parameters and the ash distribution equilibrium value. When the congestion coefficient of the economizer meets the set cleaning warning conditions for the economizer, the cleaning warning for the economizer is automatically triggered.
2. The method as described in claim 1, characterized in that, Also includes: Obtain the ammonia slip rate monitoring value of the SCR system, the reference heat transfer coefficient and the actual heat transfer coefficient of the heated surface under clean conditions; Based on the reference heat transfer coefficient and the actual heat transfer coefficient, determine the growth rate index of the total ash accumulation thermal resistance of the heated surface; Based on the ammonia escape rate monitoring value and the growth rate index of the total ash accumulation thermal resistance of the heating surface, the first viscosity characteristic used to characterize the viscosity of the heating surface of the economizer is determined.
3. The method as described in claim 2, characterized in that, The determination of the first viscosity characteristic used to characterize the viscosity of the economizer's heating surface, based on the ammonia escape rate monitoring value and the growth rate index of the total ash accumulation thermal resistance of the heating surface, includes: Based on the relationship between the ammonia escape rate monitoring value and the set first and second operating condition judgment conditions, the first weight value of the growth rate index of the total ash accumulation thermal resistance of the heated surface is determined. Based on the first weight value and the ammonia escape rate monitoring value, the first viscosity characteristic used to characterize the viscosity of the heated surface of the economizer is determined.
4. The method as described in claim 1, characterized in that, The step of determining the ash distribution equilibrium value of the economizer flue based on the first viscosity characteristic and the pressure drop parameter includes: Based on the pressure drop parameters and the theoretical pressure drop value, the pressure drop distribution factor is obtained; Based on the set adjustment coefficient, the numerical range of the first viscous feature is mapped to a weight interval to obtain the viscous stability factor; The ash distribution equilibrium value of the economizer flue is obtained based on the pressure drop distribution factor and the viscosity stability factor.
5. The method as described in claim 4, characterized in that, The step of determining the ash distribution equilibrium value of the economizer flue based on the first viscosity characteristic and the pressure drop parameter further includes: Based on the obtained flue gas flow rate of the economizer flue, the theoretical pressure drop value is determined by fitting the clean pressure drop with the flue gas flow rate. Accordingly, determining the theoretical pressure drop value by fitting the constructed clean pressure drop with the flue gas flow rate further includes: With the economizer clean, obtain the flue gas flow rate and measured clean pressure drop corresponding to each stable load point; Based on the direct proportional relationship between the cleaning pressure drop and the square of the flue gas flow rate, a fitting relationship between the cleaning pressure drop and the flue gas flow rate is established.
6. The method as described in claim 1, characterized in that, The flue gas temperature parameters include: inlet flue gas temperature and outlet flue gas temperature. Determining the economizer's congestion coefficient based on the flue gas temperature parameters and the ash distribution equilibrium value includes: The flue gas temperature drop index is determined based on the inlet flue gas temperature and the outlet flue gas temperature. The congestion coefficient of the economizer is determined based on the flue gas temperature drop index and the ash distribution equilibrium value.
7. An economizer cleaning early warning device based on flue gas duct status, characterized in that, It includes an acquisition module, a first determination module, a second determination module, and a triggering module, wherein: The acquisition module is used to acquire the pressure drop parameters, flue gas temperature parameters, and a first viscosity characteristic used to characterize the viscosity of the heated surface of the economizer. The first determining module is used to determine the ash distribution equilibrium value of the economizer flue based on the first viscosity characteristic and the pressure drop parameter. The second determining module is used to determine the congestion coefficient of the economizer based on the flue gas temperature parameters and the ash distribution equilibrium value. The triggering module is used to automatically trigger a cleaning warning for the economizer when the congestion coefficient of the economizer meets the set cleaning warning conditions for the economizer.
8. An electronic device, characterized in that, include: The memory, the processor, and the computer program stored in the memory and executable on the processor, wherein the computer program, when executed by the processor, implements the steps of the economizer cleaning early warning method based on flue gas condition as described in any one of claims 1 to 6.
9. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores a computer program that, when executed by a processor, implements the steps of the economizer cleaning early warning method based on flue gas condition as described in any one of claims 1 to 6.
10. A computer program product, characterized in that, The method includes a computer program that, when executed by a processor, implements the economizer cleaning early warning method based on flue gas condition as described in any one of claims 1 to 6.