Air pre-heater blockage treatment method, device and equipment

Abstract

The invention provides an air pre-heater blockage treatment method, device and equipment, and relates to the technical field of boiler equipment maintenance. The method comprises the following steps: acquiring fly ash components of an inlet flue and an outlet flue of the air pre-heater to be treated; chemical raw materials of the corrosion and ash removal agent and the proportion of the chemical raw materials are determined according to the components of the fly ash, and the corrosion and ash removal agent is prepared; wherein the fly ash comprises alkali metal and non-alkali metal, and the components of the fly ash comprise alkali metal and non-alkali metal; when the adding condition of the corrosion and ash removal agent is met, the adding amount of the corrosion and ash removal agent is determined according to the coal feeding amount and the as-received basis ash amount; wherein the adding condition is judged according to the unit load; adding a corrosion and ash removal agent according to the addition condition and the addition amount, and updating fly ash components of the inlet flue and the outlet flue at a preset interval time; wherein the adding position of the corrosion and ash removal agent is a pear coal device of a coal feeding belt of the uppermost coal mill. The air pre-heater can be treated on line.

Description

Technical Field

[0001] The present invention relates to the technical field of boiler equipment maintenance, and in particular to a method, device and equipment for treating air preheater blockage. Background Art

[0002] Currently, coal-fired power plant boilers generally use selective catalytic reduction (SCR) technology to control nitrogen oxide emissions. Some coal-fired power plants have low heating loads. Compared to other combined heat and power units, these plants have experienced increasing periods of low-load operation, a rapid increase in the frequency of unit starts and stops for peak load regulation, and widespread intraday load fluctuations. This has significantly deviated from design operating conditions, leading to lower flue gas temperatures at the denitrification inlet, reduced catalyst activity, decreased denitrification efficiency, and a significant increase in ammonia injection, resulting in increased ammonia slip.

[0003] The escaped ammonia and sulfur trioxide in the flue gas can easily react at the cold end heat sink of the air preheater (APC) to produce ammonium bisulfate (ABS). The ammonium bisulfate condenses and adheres to the cold end of the APC, causing ash blockage, resulting in an increase in the APC inlet and outlet pressure difference, a decrease in heat exchange efficiency, fluctuations in the induced draft fan current and furnace negative pressure, and increased fan energy consumption. Some units have already limited their load capacity, seriously threatening the safe and economical operation of the units.

[0004] Under stringent environmental protection requirements for ultra-low and ultra-low NOx emissions, ammonia slip from SCR denitrification cannot be completely avoided. Preventive measures can only mitigate ABS (absorbent ionization) (ABS) buildup in the air preheater (AH). To further address ABS blockage in AHs from a governance perspective, trials have been launched using existing steam sootblowers, including hot air recirculation, single-row flue temperature-raising operation, and heaters to increase cold air temperatures. These heat-assisted ABS descaling technologies have varying degrees of resistance reduction. Furthermore, they require operators to perform unconventional operations, disrupting the normal operation of the units. Inexperienced operators or errors in coordination can lead to downtime risks for coal-fired boiler units and challenges to the stability of the power grid.

[0005] Therefore, there is an urgent need for a method for online treatment of air preheater blockage. Summary of the Invention

[0006] The embodiments of the present invention provide a method, device and equipment for treating blockage of an air preheater, so as to solve the problem that the air preheater cannot be treated online.

[0007] In a first aspect, an embodiment of the present invention provides a method for treating air preheater blockage, comprising:

[0008] Obtain the fly ash composition of the inlet flue and outlet flue of the air preheater to be treated;

[0009] Determining the chemical raw materials and the proportions of the chemical raw materials for the corrosion inhibitor and ash cleaner based on the fly ash components, and preparing the corrosion inhibitor and ash cleaner; wherein the fly ash components include the content and composition of alkali metals and non-alkali metals;

[0010] When the conditions for adding corrosion inhibitor and ash remover are met, the amount of corrosion inhibitor and ash remover to be added is determined based on the amount of coal fed and the amount of base ash received into the furnace; wherein, the addition conditions are determined based on the unit load;

[0011] Add corrosion inhibitor and ash remover according to the adding conditions and adding amount, and update the fly ash composition of the inlet flue and outlet flue at the preset interval; wherein, the adding position of the corrosion inhibitor and ash remover is the pear coal device of the coal feeding belt of the uppermost pulverizer.

[0012] In one possible implementation, the chemical raw materials and the ratio of the chemical raw materials of the corrosion inhibitor and ash cleaner are determined according to the fly ash composition, and the corrosion inhibitor and ash cleaner is prepared, including:

[0013] Screening chemical raw materials based on the alkali metal and non-alkali metal components of the fly ash from the inlet and outlet flues;

[0014] Determine the proportion of various chemical raw materials based on the content of alkali metals and non-alkali metals in the fly ash components of the inlet and outlet flues;

[0015] The chemical raw materials screened are mixed and formulated according to a proportion, and then a foaming component is added to obtain a corrosion inhibition and dust cleaning agent.

[0016] In a possible implementation, when the conditions for adding the corrosion inhibitor and ash remover are met, before determining the amount of the corrosion inhibitor and ash remover to be added based on the coal feed amount and the amount of base ash received into the furnace, the method further includes:

[0017] Determine the chemical raw materials and ratio of the corrosion inhibitor and ash cleaner according to the fly ash composition, and prepare a variety of spare corrosion inhibitor and ash cleaners with different ratios;

[0018] Configure simulated fly ash according to the fly ash composition of the inlet flue and outlet flue;

[0019] The target corrosion inhibitor is determined based on the reaction data of simulated fly ash and a plurality of alternative corrosion inhibitors with different proportions, and the target corrosion inhibitor is used as the corrosion inhibitor to be added when the addition conditions of the corrosion inhibitor are met.

[0020] In one possible implementation, the target corrosion inhibitor and ash remover is determined based on reaction data of simulated fly ash and multiple alternative corrosion inhibitor and ash removers with different ratios, including:

[0021] Attach the simulated fly ash to the same material surface as the air preheater heating surface and calculate the initial thickness of the simulated fly ash;

[0022] Spray a variety of spare corrosion inhibitors and dust removers with different proportions evenly on the material surface;

[0023] After controlling the reaction within a preset temperature range and a preset time period, the reaction thickness of the simulated fly ash is calculated respectively;

[0024] The target corrosion inhibitor and dust remover is determined based on the initial thickness and each reaction thickness.

[0025] In one possible implementation, the amount of corrosion inhibitor and ash remover to be added is determined based on the amount of coal fed and the amount of base ash received into the furnace, including:

[0026] Calculate the tail flue ash amount based on the coal feed amount and the base ash amount received in the furnace in the distributed control system DCS;

[0027] Determine the amount of corrosion inhibitor and ash remover to be added based on the amount of ash in the tail flue.

[0028] In a possible implementation, before determining the chemical raw materials and the proportions of the corrosion inhibitor and dust remover according to the fly ash composition, the following steps are further included:

[0029] Obtaining a coal sample for combustion in the boiler and analyzing the coal sample to obtain coal quality analysis results; wherein the coal quality analysis results include the content and composition of alkali metals and non-alkali metals;

[0030] Determine candidate chemical raw materials for corrosion inhibitors and dust removers based on coal quality analysis results;

[0031] The candidate chemical raw materials include chemical raw materials for corrosion inhibitors and dust removers determined according to the fly ash composition.

[0032] In a possible implementation, the added condition includes: the unit load is higher than a preset reference load; wherein the reference load is determined according to the actual operating conditions of the boiler and the technical agreement.

[0033] In a possible implementation, after adding the corrosion inhibitor and ash remover according to the addition conditions and amount, and updating the fly ash composition of the inlet flue and the outlet flue at a preset interval, the method further includes:

[0034] Obtain the air preheater inlet pressure difference, outlet pressure difference and induced draft fan current data through the distributed control system DCS;

[0035] Determine whether the treatment meets the requirements based on the air preheater inlet pressure difference, outlet pressure difference and induced draft fan current data;

[0036] When the requirements are met, stop adding the corrosion inhibitor and dust remover; when the requirements are not met, re-prepare the corrosion inhibitor and dust remover based on the updated fly ash composition.

[0037] In a second aspect, an embodiment of the present invention provides an air preheater blockage control device, comprising:

[0038] A fly ash composition acquisition module is used to obtain the fly ash composition of the inlet flue and outlet flue of the air preheater to be treated;

[0039] A corrosion inhibitor and dust cleaning agent preparation module is used to determine the chemical raw materials and the ratio of the chemical raw materials of the corrosion inhibitor and dust cleaning agent according to the fly ash composition, and to prepare the corrosion inhibitor and dust cleaning agent; wherein the fly ash composition includes the content and composition of alkali metals and non-alkali metals;

[0040] A corrosion inhibitor and ash remover addition judgment module is used to determine the amount of corrosion inhibitor and ash remover to be added based on the coal feed rate and the amount of base ash received into the furnace when the addition conditions for the corrosion inhibitor and ash remover are met; wherein the addition conditions are judged based on the unit load;

[0041] The corrosion inhibitor and ash cleaning agent adding module is used to add the corrosion inhibitor and ash cleaning agent according to the adding conditions and the adding amount, and to update the fly ash composition of the inlet flue and the outlet flue at the preset interval time.

[0042] In a third aspect, an embodiment of the present invention provides an electronic device comprising a memory and a processor, wherein the memory stores a computer program, and when the processor executes the computer program, the method in the first aspect or any possible implementation of the first aspect is implemented.

[0043] In an embodiment of the present invention, by obtaining the fly ash composition of the air preheater inlet and outlet flues, the corrosion inhibitor and ash remover can be selected and configured in a targeted manner to ensure that it matches the actual fly ash composition and improve the treatment effect. The addition conditions of the corrosion inhibitor and ash remover are determined according to the unit load, and the addition amount is determined according to the coal feed rate and the base ash amount received into the furnace. This can adapt to changes in the boiler operating conditions in real time, ensure that the addition amount of the ash remover is reasonable, and avoid excessive or insufficient addition. By automatically judging the addition conditions and determining the addition amount, the operating burden of the operating personnel is reduced, the risks caused by improper human operation are reduced, and the stability and safety of the operation are improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] Figure 1 This is a logic block diagram of an air preheater blockage treatment method provided by an embodiment of the present invention;

[0045] Figure 2 This is a flow chart of an implementation method for treating air preheater blockage provided by an embodiment of the present invention;

[0046] Figure 3 1. It is a structural diagram of an air preheater blockage treatment device provided by an embodiment of the present invention;

[0047] Figure 4 is a schematic diagram of an electronic device provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0048] The embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0049] Figure 1 This is a logic block diagram of the air preheater blockage treatment method provided by the embodiment of the present invention; see Figure 2 , which shows a flow chart of the implementation of the air preheater blockage treatment method provided by an embodiment of the present invention, and is described in detail as follows:

[0050] Step 201: Obtain the fly ash components of the inlet flue and outlet flue of the air preheater to be treated.

[0051] In this embodiment, the inlet flue and outlet flue are two key parts of the air preheater (air preheater). When the flue gas flows in the air preheater, it will pass through these two parts, and fly ash will be deposited in them, causing blockage. For the air preheater that needs to be treated for blockage, the fly ash composition is obtained at its inlet flue and outlet flue respectively. Fly ash composition refers to the various elements and compounds contained in the fly ash, such as the content and composition of alkali metals (such as potassium, sodium, etc.) and non-alkali metals (such as calcium, iron, etc.). These components are very important for the subsequent determination of the formula and treatment plan of the corrosion inhibitor and dust remover.

[0052] In this example, after collecting the fly ash components from the inlet and outlet flues, the fly ash components were analyzed in the laboratory to compare the differences in the fly ash components from the inlet and outlet flues, mainly referring to the differences in the alkali metal and non-alkali metal contents. The specific steps are as follows:

[0053] First, install the collection device: Install fly ash collectors in the straight sections of the air preheater inlet and outlet flues, following the isokinetic sampling principle. The sampling nozzles of the collectors align with the flue gas flow direction, and the sampling speed is equal to the flue gas flow velocity to ensure representative fly ash. Install two to three collectors in each of the inlet and outlet flues to ensure comprehensive collection.

[0054] Secondly, fly ash collection: Fly ash collection is conducted every eight hours, with each collection lasting 30-60 minutes. During the collection process, the sampling pump flow rate is adjusted to maintain a constant sampling rate. The collected fly ash is placed in a dedicated fly ash storage container and labeled, recording information such as the collection time and location.

[0055] Next, component analysis: In the laboratory, X-ray fluorescence spectrometers and inductively coupled plasma mass spectrometers are used for component analysis. X-ray fluorescence spectrometers can quickly analyze the main elemental composition of fly ash. By irradiating the fly ash sample with X-rays, the elements in the sample are stimulated to emit fluorescence. The type and content of the elements are determined based on the energy and intensity of the fluorescence. Inductively coupled plasma mass spectrometers are used to analyze trace elements in fly ash. After dissolving the fly ash sample, the elements are ionized using inductively coupled plasma. The mass-to-charge ratio of the ions is then measured using a mass spectrometer to determine the type and content of the trace elements.

[0056] Step 202: Determine the chemical raw materials and the proportions of the corrosion-inhibiting cleaning agent based on the fly ash components, and prepare the corrosion-inhibiting cleaning agent; wherein the fly ash components include the content and composition of alkali metals and non-alkali metals.

[0057] In this embodiment, the components of the fly ash are first analyzed, and then the chemical raw materials and the amount of each raw material to be used to prepare the corrosion inhibitor and ash remover are determined based on these components to ensure that it can effectively control the blockage of the air preheater.

[0058] Step 203: When the conditions for adding corrosion inhibitor and ash remover are met, the amount of corrosion inhibitor and ash remover to be added is determined based on the amount of coal fed and the amount of base ash received into the furnace; wherein the adding conditions are determined based on the unit load.

[0059] In this embodiment, the unit load refers to the current output power of the generator set, usually expressed as a percentage, such as 60% load. The addition conditions are determined based on the unit load, and the corrosion inhibitor and ash remover will only be added when specific conditions are met. The amount of corrosion inhibitor and ash remover to be added is determined based on two factors: the coal feed rate and the amount of base ash received into the furnace. The coal feed rate refers to the amount of coal fed into the pulverizer per unit time, usually expressed in tons / hour (t / h). The amount of base ash received into the furnace refers to the ash content of the coal entering the boiler in the received state (i.e., the state without drying or other treatment). Ash is the non-combustible solid residue left after coal combustion, usually expressed as a percentage by mass.

[0060] In a possible implementation, the added condition includes: the unit load is higher than a preset reference load; wherein the reference load is determined according to the actual operating conditions of the boiler and the technical agreement.

[0061] In this embodiment, the reference load is a preset value used to determine whether to add the corrosion inhibitor and soot cleaner. The reference load is determined based on the actual operating conditions of the boiler (such as historical operating data, design parameters, operating experience, etc.) and technical agreements. The technical agreement stipulates the operating parameters and operation requirements of the boiler under different conditions. Only when the unit load is higher than the preset reference load, the addition of the corrosion inhibitor and soot cleaner is started. If the unit load is lower than the reference load or lower than a certain set value of the reference load, the addition of the corrosion inhibitor and soot cleaner is stopped.

[0062] In this embodiment, during high-load operation, the flue gas volume and ash content of the boiler are usually large, and the possibility of air preheater blockage is also higher. Therefore, it is necessary to add a corrosion inhibitor and soot cleaner to prevent blockage. During low-load operation, the flue gas volume and ash content are small, and the blockage risk is low. At this time, adding a corrosion inhibitor and soot cleaner may be unnecessary, thus saving costs. By dynamically adjusting the addition amount of the corrosion inhibitor and soot cleaner, the stability of boiler operation and the use effect of the corrosion inhibitor and soot cleaner can be ensured.

[0063] Specifically, let the current unit load be P, the reference load be P0, and the load difference be ΔP. When P > P0, it is determined that the addition condition is satisfied, and the addition equipment of the corrosion inhibitor and soot cleaner is started for addition; where P0 is generally taken as 60%, and it can be determined according to the previously agreed technical agreement. The initially determined addition amount is generally adjusted proportionally according to the increase or decrease of the rated evaporation amount according to the requirement of "for a boiler with an evaporation capacity of 2000 t / h, 1 t is added every day", or it can also be determined according to the previously agreed technical agreement such as the technical agreement. During the addition process, the operating status and addition amount of the metering pump are monitored in real time to ensure the accuracy and stability of the addition.

[0064] When P < P0 - ΔP, it is determined that the addition condition is not satisfied, and the addition equipment of the corrosion inhibitor and soot cleaner is stopped without addition. The load difference ΔP is determined based on the historical operating data, design parameters, and actual operating conditions of the boiler, and it is evaluated and adjusted once a week during the operation process to ensure the rationality of the addition condition.

[0065] Among them, the data acquisition is to collect the unit load data in real time through the distributed control system DCS, and it is collected once every 1 minute to ensure the timeliness and accuracy of the data.

[0066] Step 204: Add the corrosion inhibitor and soot cleaner according to the addition condition and addition amount, and update the fly ash composition of the inlet flue and outlet flue at a preset interval; among them, the addition position of the corrosion inhibitor and soot cleaner is at the coal plough of the topmost coal feeder belt of the coal mill.

[0067] In this embodiment, corrosion inhibitor and ash remover are added in accordance with the addition amount by means of a special adding device, and the corrosion inhibitor and ash remover adding device is installed at the coal plow of the coal feeding belt of the top coal mill in the coal mill. The top coal mill is the highest layer of the coal mill, usually where the coal enters the coal mill. The coal feeding belt is a conveyor belt that transports coal to the coal mill, and the coal is fed into the coal mill for grinding through the coal feeding belt. The coal plow is a device installed on the coal feeding belt, which is used to control the flow and distribution of coal to ensure that the coal enters the coal mill evenly. The adding equipment mainly includes a storage tank, a metering pump and a conveying pipeline. The storage tank is used to store the corrosion inhibitor and ash remover, and the metering pump achieves precise control of the amount of corrosion inhibitor and ash remover added by precisely controlling the motor speed. The conveying pipeline transports the corrosion inhibitor and ash remover from the storage tank to the coal feeding belt.

[0068] The dosing equipment is equipped with a precise metering device that can monitor and control the amount of corrosion inhibitor and dust remover added in real time. It also has automatic calibration and fault alarm functions. During the corrosion inhibitor and dust remover addition process, the operating status of the dosing equipment is monitored in real time to ensure the continuity and stability of the addition.

[0069] In this embodiment, the corrosion inhibitor and ash remover is added to the coal plow on the coal feed belt of the top pulverizer. This means that the corrosion inhibitor and ash remover is added during the coal conveying process, evenly distributed on the coal through the plow, and then enters the pulverizer along with the coal. This allows the corrosion inhibitor and ash remover to enter the boiler system along with the pulverized coal, thereby playing a role in the combustion process and reducing corrosion and clogging of the air preheater. This addition method ensures that the corrosion inhibitor and ash remover is evenly distributed throughout the coal entering the boiler, effectively addressing air preheater clogging issues.

[0070] In an embodiment of the present invention, by obtaining the fly ash composition of the air preheater inlet and outlet flues, the corrosion inhibitor and ash remover can be selected and configured in a targeted manner to ensure that it matches the actual fly ash composition and improve the treatment effect. The addition conditions of the corrosion inhibitor and ash remover are determined according to the unit load, and the addition amount is determined according to the coal feed rate and the base ash amount received into the furnace. This can adapt to changes in the boiler operating conditions in real time, ensure that the addition amount of the ash remover is reasonable, and avoid excessive or insufficient addition. By automatically judging the addition conditions and determining the addition amount, the operating burden of the operating personnel is reduced, the risks caused by improper human operation are reduced, and the stability and safety of the operation are improved.

[0071] In one possible implementation, the amount of corrosion inhibitor and ash remover to be added is determined based on the amount of coal fed and the amount of base ash received into the furnace, including:

[0072] Calculate the tail flue ash amount based on the coal feed amount and the base ash amount received in the furnace in the distributed control system DCS;

[0073] Determine the amount of corrosion inhibitor and ash remover to be added based on the amount of ash in the tail flue.

[0074] In this embodiment, the tail flue ash volume reflects the total amount of ash generated during boiler operation. The amount of corrosion inhibitor and ash remover added is determined based on the tail flue ash volume to ensure that the amount of ash remover added matches the actual ash content, thereby effectively preventing air preheater blockage.

[0075] Specifically, the preset amount of corrosion inhibitor and ash remover added is M, the coal feed amount is G, and the amount of base ash received into the furnace is A. The linear relationship formula is:

[0076] M=k(G×A)+b

[0077] Here, k is a coefficient determined based on actual boiler operation, coal quality characteristics, and the performance of the corrosion inhibitor and ash remover; b is a constant. The coefficient k and constant b were determined by collecting and analyzing boiler operation data, coal quality analysis data, and corrosion inhibitor and ash remover performance data under different operating conditions, using data processing methods such as the least squares method.

[0078] In this embodiment, a preset observation period, such as one week, is set. During this week, the specified dosage is added daily. After one week, fly ash from the air preheater inlet and outlet flues is collected again for analysis, and the corrosion inhibitor and ash remover is updated until the air preheater blockage problem is effectively resolved and the preset effect is achieved, such as a reduction of the flue gas differential pressure between the air preheater inlet and outlet by more than 200 Pa, or a predetermined reduction in the flue gas differential pressure.

[0079] In one possible implementation, the chemical raw materials and the ratio of the chemical raw materials of the corrosion inhibitor and ash cleaner are determined according to the fly ash composition, and the corrosion inhibitor and ash cleaner is prepared, including:

[0080] Screening chemical raw materials based on the alkali metal and non-alkali metal components of the fly ash from the inlet and outlet flues;

[0081] Determine the proportion of various chemical raw materials based on the content of alkali metals and non-alkali metals in the fly ash components of the inlet and outlet flues;

[0082] The chemical raw materials screened are mixed and formulated according to a proportion, and then a foaming component is added to obtain a corrosion inhibition and dust cleaning agent.

[0083] In this embodiment, based on the composition of alkali metals and non-alkali metals in fly ash, chemical raw materials that can react chemically with these components or play a role in treatment are selected. For example: if the alkali metal content in fly ash is high, it may be necessary to select chemical substances that can react with alkali metals. If the non-alkali metal content (such as silicon, aluminum) is high, it may be necessary to select chemical substances that can react with these non-alkali metals. According to the content of alkali metals and non-alkali metals in fly ash, the ratio of each chemical raw material is determined. For example: if the alkali metal content in fly ash is 10% and the non-alkali metal content is 5%, it may be necessary to mix the corresponding chemical raw materials in a certain ratio (such as 2:1) to ensure the effectiveness of the corrosion inhibitor. Mixing and blending refers to mixing and blending the screened chemical raw materials according to a determined ratio. Adding a foaming component refers to adding a foaming component to the mixed and blended chemical raw materials to improve the cleaning effect of the corrosion inhibitor.

[0084] In a possible implementation, when the conditions for adding the corrosion inhibitor and ash remover are met, before determining the amount of the corrosion inhibitor and ash remover to be added based on the coal feed amount and the amount of base ash received into the furnace, the method further includes:

[0085] Determine the chemical raw materials and ratio of the corrosion inhibitor and ash cleaner according to the fly ash composition, and prepare a variety of spare corrosion inhibitor and ash cleaners with different ratios;

[0086] Configure simulated fly ash according to the fly ash composition of the inlet flue and outlet flue;

[0087] The target corrosion inhibitor is determined based on the reaction data of simulated fly ash and a plurality of alternative corrosion inhibitors with different proportions, and the target corrosion inhibitor is used as the corrosion inhibitor to be added when the addition conditions of the corrosion inhibitor are met.

[0088] In this embodiment, based on the differences in the composition of alkali metals and non-alkali metals in the fly ash at the inlet and outlet of the air preheater, chemical raw materials determined by coal quality analysis were selected, mixed and formulated, and foaming components were added to develop five types of alternative corrosion inhibitors and ash removers.

[0089] In this embodiment, simulated fly ash preparation involves selecting appropriate chemical raw materials based on the difference in fly ash composition between the air preheater inlet and outlet. For example, if the calcium content of the inlet fly ash is higher than that of the outlet fly ash, calcium carbonate or other calcium-containing compounds can be added to adjust the simulated fly ash composition to match the actual fly ash.

[0090] In one possible implementation, the target corrosion inhibitor and ash remover is determined based on reaction data of simulated fly ash and multiple alternative corrosion inhibitor and ash removers with different ratios, including:

[0091] Attach the simulated fly ash to the same material surface as the air preheater heating surface and calculate the initial thickness of the simulated fly ash;

[0092] Spray a variety of spare corrosion inhibitors and dust removers with different proportions evenly on the material surface;

[0093] After controlling the reaction within a preset temperature range and a preset time period, the reaction thickness of the simulated fly ash is calculated respectively;

[0094] The target corrosion inhibitor and dust remover is determined based on the initial thickness and each reaction thickness.

[0095] In this example, a specific type of corrosion inhibitor and dust remover is evenly sprayed onto the surface of the material to which the simulated fly ash is firmly attached. The reaction temperature is controlled between 80°C and 140°C, and the reaction time is 3-5 minutes. When the thickness of the simulated fly ash on the material surface exceeds twice its original thickness, the selected type of corrosion inhibitor and dust remover is added. If this does not reach the required thickness, another type is selected until the required thickness is reached.

[0096] In a possible implementation, before determining the chemical raw materials and the proportions of the corrosion inhibitor and dust remover according to the fly ash composition, the following steps are further included:

[0097] Obtaining a sample of coal used in the boiler and analyzing the sample to obtain a coal quality analysis result; wherein the coal quality analysis result includes the content and composition of alkali metals and non-alkali metals;

[0098] Determine candidate chemical raw materials for corrosion inhibitors and dust removers based on coal quality analysis results;

[0099] The candidate chemical raw materials include chemical raw materials for corrosion inhibitors and dust removers determined according to the fly ash composition.

[0100] In this embodiment, coal quality analysis involves collecting typical coal samples recently burned in the boiler and sending them to a professional analytical laboratory. Advanced chemical analysis instruments are then used to comprehensively analyze the incoming coal ash, accurately determining the content and composition of alkali and non-alkali metals. Based on the content and composition of alkali and non-alkali metals in the incoming coal ash, chemical raw materials capable of reacting with them are prepared as the chemical raw materials for preparing the corrosion inhibitor and ash remover. The specific steps are as follows:

[0101] First, sample collection: During routine boiler operation, coal samples are collected regularly from different locations in the fuel storage area to ensure representativeness. Each sample should be no less than 5 kg, using a multi-point sampling method, and then mixed evenly.

[0102] Secondly, drying treatment: transfer the collected coal samples to the drying oven in the laboratory, set the drying temperature to 105℃-110℃, and the drying time to 2-4 hours until the sample reaches a constant weight, so as to remove moisture from the sample and avoid moisture from interfering with subsequent analysis results.

[0103] Next, grind and pulverize: Use a grinder to grind the dried coal sample to a particle size of less than 0.2mm to facilitate subsequent component analysis. During the grinding process, control the grinder speed and grinding time to ensure uniform crushing of the sample.

[0104] Finally, component analysis: A spectrometer is used to qualitatively and quantitatively analyze the alkali and non-alkali metal components in the coal sample. The crushed sample is formed into a specifically shaped sample slice and placed in the spectrometer's sample slot. An excitation light source is used to excite the elements in the sample, causing them to emit a characteristic spectrum. The wavelength and intensity of the spectrum are used to determine the element's type and content. A chemical titration device is also used to perform auxiliary quantitative analysis of some elements, such as acid-base titration to determine the content of acidic oxides in the coal, to ensure the accuracy of the analysis results.

[0105] In a possible implementation, after adding the corrosion inhibitor and ash remover according to the addition conditions and amount, and updating the fly ash composition of the inlet flue and the outlet flue at a preset interval, the method further includes:

[0106] Obtain the air preheater inlet pressure difference, outlet pressure difference and induced draft fan current data through the DCS system;

[0107] Determine whether the treatment meets the requirements based on the air preheater inlet pressure difference, outlet pressure difference and induced draft fan current data;

[0108] When the requirements are met, stop adding the corrosion inhibitor and dust remover; when the requirements are not met, re-prepare the corrosion inhibitor and dust remover based on the updated fly ash composition.

[0109] In this embodiment, the preset judgment values of the air preheater inlet and outlet differential pressure and the induced draft fan current are determined according to the normal operating parameter range of the boiler. The air preheater inlet differential pressure ΔP is collected in real time by the DCS system. in , outlet differential pressure ΔP out and the current I of the induced draft fan, with a time interval of at least 5 minutes. Assume that the preset differential pressure difference is ΔP set , the reference current of the induced draft fan is I0, and the preset current difference is ΔI set , when |ΔP in -ΔP out |≥ΔP set And |I-I0|≥ΔI set When the air preheater is blocked, it is determined that the treatment has met the treatment requirements. set and the preset current difference ΔI set It is determined based on a comprehensive combination of factors including the normal operating parameter range of the boiler, the design specifications of the air preheater, and the performance parameters of the induced draft fan, and is optimized and adjusted based on feedback on the treatment effect during actual operation.

[0110] The present invention realizes efficient treatment and real-time monitoring of air preheater blockage through online monitoring, fly ash composition analysis, corrosion inhibitor and dust removal agent addition and effect evaluation. It has the advantages of low cost, high efficiency and no impact on unit operation, and is suitable for blockage treatment of air preheaters of coal-fired power plant boilers.

[0111] It should be understood that the size of the serial numbers of the steps in the above embodiments does not mean the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of the present invention.

[0112] The following are device embodiments of the present invention. For details not fully described therein, reference may be made to the corresponding method embodiments described above.

[0113] Figure 3 The following is a schematic diagram showing the structure of an air preheater blockage treatment device provided by an embodiment of the present invention. For ease of explanation, only the parts related to the embodiment of the present invention are shown, which are described in detail as follows:

[0114] like Figure 3 As shown, the air preheater blockage control device 3 includes:

[0115] The fly ash composition acquisition module 31 is used to obtain the fly ash composition of the inlet flue and the outlet flue of the air preheater to be treated;

[0116] The corrosion inhibitor and dust cleaning agent preparation module 32 is used to determine the chemical raw materials and the ratio of the chemical raw materials of the corrosion inhibitor and dust cleaning agent according to the fly ash composition, and prepare the corrosion inhibitor and dust cleaning agent; wherein the fly ash composition includes the content and composition of alkali metals and non-alkali metals;

[0117] The corrosion inhibitor and ash remover addition judgment module 33 is used to determine the amount of corrosion inhibitor and ash remover to be added based on the coal feed rate and the amount of base ash received into the furnace when the addition conditions of the corrosion inhibitor and ash remover are met; wherein the addition conditions are judged based on the unit load;

[0118] The corrosion inhibitor and ash remover adding module 34 is used to add the corrosion inhibitor and ash remover according to the adding conditions and the adding amount, and to update the fly ash composition of the inlet flue and the outlet flue at the preset interval; wherein, the corrosion inhibitor and ash remover is added at the coal pearing device of the coal feeding belt of the uppermost pulverizer.

[0119] In a possible implementation, the corrosion inhibitor and dust cleaning agent preparation module 32 is further configured to:

[0120] Screening chemical raw materials based on the alkali metal and non-alkali metal components of the fly ash from the inlet and outlet flues;

[0121] Determine the proportion of various chemical raw materials based on the content of alkali metals and non-alkali metals in the fly ash components of the inlet and outlet flues;

[0122] The chemical raw materials screened are mixed and formulated according to a proportion, and then a foaming component is added to obtain a corrosion inhibition and dust cleaning agent.

[0123] In a possible implementation, the corrosion inhibitor and dust cleaning agent preparation module 32 is further configured to:

[0124] Determine the chemical raw materials and ratio of the corrosion inhibitor and ash cleaner according to the fly ash composition, and prepare a variety of spare corrosion inhibitor and ash cleaners with different ratios;

[0125] Configure simulated fly ash according to the fly ash composition of the inlet flue and outlet flue;

[0126] The target corrosion inhibitor is determined based on the reaction data of simulated fly ash and a plurality of alternative corrosion inhibitors with different proportions, and the target corrosion inhibitor is used as the corrosion inhibitor to be added when the addition conditions of the corrosion inhibitor are met.

[0127] In a possible implementation, the corrosion inhibitor and dust cleaning agent preparation module 32 is further configured to:

[0128] Attach the simulated fly ash to the same material surface as the air preheater heating surface and calculate the initial thickness of the simulated fly ash;

[0129] Spray a variety of spare corrosion inhibitors and dust removers with different proportions evenly on the material surface;

[0130] After controlling the reaction within a preset temperature range and a preset time period, the reaction thickness of the simulated fly ash is calculated respectively;

[0131] The target corrosion inhibitor and dust remover is determined based on the initial thickness and each reaction thickness.

[0132] In a possible implementation, the corrosion inhibitor and dust remover addition determination module 33 is further configured to:

[0133] Calculate the tail flue ash amount based on the coal feed amount and the base ash amount received in the furnace in the distributed control system DCS;

[0134] Determine the amount of corrosion inhibitor and ash remover to be added based on the amount of ash in the tail flue.

[0135] In a possible implementation, the corrosion inhibitor and dust cleaning agent preparation module 32 is further configured to:

[0136] Obtaining a sample of coal used in the boiler and analyzing the sample to obtain a coal quality analysis result; wherein the coal quality analysis result includes the content and composition of alkali metals and non-alkali metals;

[0137] Determine candidate chemical raw materials for corrosion inhibitors and dust removers based on coal quality analysis results;

[0138] The candidate chemical raw materials include chemical raw materials for corrosion inhibitors and dust removers determined according to the fly ash composition.

[0139] In a possible implementation, the corrosion inhibitor and dust remover adding module 34 is further configured to:

[0140] Obtain the air preheater inlet pressure difference, outlet pressure difference and induced draft fan current data through the DCS system;

[0141] Determine whether the treatment meets the requirements based on the air preheater inlet pressure difference, outlet pressure difference and induced draft fan current data;

[0142] When the requirements are met, stop adding the corrosion inhibitor and dust remover; when the requirements are not met, re-prepare the corrosion inhibitor and dust remover based on the updated fly ash composition.

[0143] In an embodiment of the present invention, by obtaining the fly ash composition of the air preheater inlet and outlet flues, the corrosion inhibitor and ash remover can be selected and configured in a targeted manner to ensure that it matches the actual fly ash composition and improve the treatment effect. The addition conditions of the corrosion inhibitor and ash remover are determined according to the unit load, and the addition amount is determined according to the coal feed rate and the base ash amount received into the furnace. This can adapt to changes in the boiler operating conditions in real time, ensure that the addition amount of the ash remover is reasonable, and avoid excessive or insufficient addition. By automatically judging the addition conditions and determining the addition amount, the operating burden of the operating personnel is reduced, the risks caused by improper human operation are reduced, and the stability and safety of the operation are improved.

[0144] Figure 4 Schematic diagram of an electronic device provided by an embodiment of the present invention. Figure 4 As shown, the electronic device 4 of this embodiment includes a processor 40 and a memory 41. The memory 41 stores a computer program 42. When the processor 40 executes the computer program 42, the steps of the above-described method embodiments are implemented. Alternatively, when the processor 40 executes the computer program 42, the functions of the modules / units in the above-described device embodiments are implemented.

[0145] For example, the computer program 42 may be divided into one or more modules / units, which are stored in the memory 41 and executed by the processor 40 to implement the present invention. The one or more modules / units may be a series of computer program instruction segments capable of implementing specific functions, and the instruction segments are used to describe the execution process of the computer program 42 in the electronic device 4.

[0146] The electronic device 4 may include, but is not limited to, a processor 40 and a memory 41. Those skilled in the art will appreciate that Figure 4 It is only an example of the electronic device 4 and does not constitute a limitation on the electronic device 4. It may include more or fewer components than shown in the figure, or a combination of certain components, or different components. For example, the electronic device 4 may also include input and output devices, network access devices, buses, etc.

[0147] For the sake of convenience and brevity, the division of the above functional modules / units is only used as an example. In actual applications, the above functions can be assigned to different functional modules / units as needed. The above modules / units can be implemented in the form of hardware, software, or a combination of hardware and software.

[0148] In the above embodiments, the descriptions of each embodiment have their own focus. For parts not described or recorded in detail in one embodiment, please refer to the relevant descriptions of other embodiments. Unless otherwise specified or there is a logical conflict, the terms and / or descriptions between different embodiments are consistent and can be referenced to each other. The technical features of different embodiments can be combined to form new embodiments based on their inherent logical relationships.

[0149] The embodiments described above are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the present invention, and should all be included in the scope of protection of the present invention.

Claims

1. A method for treating air preheater blockage, characterized in that: include: Obtain the fly ash composition of the inlet flue and outlet flue of the air preheater to be treated; Determining the chemical raw materials and the proportions of the chemical raw materials for the corrosion inhibitor and ash cleaner based on the fly ash components, and preparing the corrosion inhibitor and ash cleaner; wherein the fly ash components include the content and composition of alkali metals and non-alkali metals; When the conditions for adding corrosion inhibitor and ash remover are met, the amount of corrosion inhibitor and ash remover to be added is determined based on the amount of coal fed and the amount of base ash received into the furnace; wherein the addition conditions are determined based on the unit load; The corrosion inhibitor and ash remover is added according to the adding conditions and the adding amount, and the fly ash components of the inlet flue and the outlet flue are updated at preset intervals; wherein, the adding position of the corrosion inhibitor and ash remover is the coal plow of the coal feeding belt of the uppermost pulverizer.

2. The air preheater blockage treatment method according to claim 1, characterized in that: The method of determining the chemical raw materials of the corrosion inhibition and dust cleaning agent and the proportion of the chemical raw materials according to the fly ash components and preparing the corrosion inhibition and dust cleaning agent includes: Screening chemical raw materials based on the alkali metal and non-alkali metal components of the fly ash from the inlet and outlet flues; Determine the proportion of various chemical raw materials based on the content of alkali metals and non-alkali metals in the fly ash components of the inlet and outlet flues; The chemical raw materials screened are mixed and formulated according to the ratio, and then a foaming component is added to obtain a corrosion inhibition and dust cleaning agent.

3. The air preheater blockage treatment method according to claim 2, characterized in that: When the conditions for adding the corrosion inhibitor and ash remover are met, before determining the amount of the corrosion inhibitor and ash remover to be added according to the amount of coal fed and the amount of base ash received into the furnace, the method further includes: Determine the chemical raw materials and ratio of the corrosion inhibitor and ash cleaner according to the fly ash composition, and prepare a variety of spare corrosion inhibitor and ash cleaners with different ratios; Configure simulated fly ash according to the fly ash composition of the inlet flue and outlet flue; A target corrosion inhibitor is determined based on reaction data of simulated fly ash and a plurality of alternative corrosion inhibitors with different ratios, and the target corrosion inhibitor is used as the corrosion inhibitor to be added when the addition conditions of the corrosion inhibitor are met.

4. The air preheater blockage treatment method according to claim 3 is characterized in that: The method of determining the target corrosion inhibitor based on the reaction data of simulated fly ash and a plurality of alternative corrosion inhibitors with different ratios includes: Attach the simulated fly ash to the same material surface as the air preheater heating surface and calculate the initial thickness of the simulated fly ash; Spray a variety of spare corrosion inhibitors and dust removers with different proportions evenly on the material surface; After controlling the reaction within a preset temperature range and a preset time period, the reaction thickness of the simulated fly ash is calculated respectively; The target corrosion inhibitor and dust remover is determined based on the initial thickness and each reaction thickness.

5. The air preheater blockage treatment method according to claim 1, characterized in that: The method of determining the amount of corrosion inhibitor and ash remover to be added according to the amount of coal fed and the amount of base ash received into the furnace comprises: Calculate the tail flue ash amount based on the coal feed amount and the base ash amount received in the furnace in the distributed control system DCS; The amount of the corrosion inhibitor and ash remover to be added is determined according to the amount of ash in the tail flue.

6. The air preheater blockage treatment method according to claim 1, characterized in that: Before determining the chemical raw materials and the proportions of the corrosion inhibitor and dust remover according to the fly ash composition, the method further includes: Obtaining a coal sample for combustion in the boiler and analyzing the coal sample to obtain a coal quality analysis result; wherein the coal quality analysis result includes the content and composition of alkali metals and non-alkali metals; Determining candidate chemical raw materials for the corrosion inhibitor and ash remover based on the coal quality analysis results; The candidate chemical raw materials include chemical raw materials for corrosion inhibitors and dust removers determined according to fly ash components.

7. The air preheater blockage treatment method according to claim 1, characterized in that: The adding condition includes: the unit load is higher than a preset reference load; wherein, the reference load is determined according to the actual operating conditions of the boiler and the technical agreement.

8. The air preheater blockage treatment method according to claim 1, characterized in that: After adding the corrosion inhibitor and ash remover according to the adding conditions and the adding amount, and updating the fly ash components of the inlet flue and the outlet flue at a preset interval, the method further includes: Obtain the air preheater inlet pressure difference, outlet pressure difference and induced draft fan current data through the distributed control system DCS; Determine whether the treatment meets the requirements based on the air preheater inlet pressure difference, outlet pressure difference and induced draft fan current data; When the requirements are met, stop adding the corrosion inhibitor and dust remover; when the requirements are not met, re-prepare the corrosion inhibitor and dust remover based on the updated fly ash composition.

9. An air preheater blockage control device, characterized in that: include: A fly ash composition acquisition module is used to obtain the fly ash composition of the inlet flue and outlet flue of the air preheater to be treated; A corrosion inhibitor and dust cleaning agent preparation module is used to determine the chemical raw materials and the ratio of the chemical raw materials of the corrosion inhibitor and dust cleaning agent according to the fly ash components, and to prepare the corrosion inhibitor and dust cleaning agent; wherein the fly ash components include the content and composition of alkali metals and non-alkali metals; A corrosion inhibitor and ash remover addition judgment module is used to determine the amount of corrosion inhibitor and ash remover to be added based on the coal feed rate and the amount of base ash received into the furnace when the addition conditions of the corrosion inhibitor and ash remover are met; wherein the addition conditions are judged based on the unit load; The corrosion inhibitor and dust cleaning agent adding module is used to add the corrosion inhibitor and dust cleaning agent according to the adding conditions and the adding amount, and to update the fly ash components of the inlet flue and the outlet flue at preset intervals.

10. An electronic device, characterized in that: The method comprises a memory and a processor, wherein the memory stores a computer program, and when the processor executes the computer program, the method according to any one of claims 1 to 8 is implemented.

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