A method for collecting in-furnace flue gas to increase the SCR inlet temperature

Abstract

The present invention discloses a method for collecting flue gas near the furnace to increase the SCR inlet temperature, which relates to the technical field of tail gas treatment. The method includes dividing flue ducts into a first flue duct and a second flue duct according to the historical information of the flue gas in each flue duct; obtaining the real-time information of the flue gas in each flue duct, and determining the respective fluctuation information corresponding to the first flue duct and the second flue duct based on the real-time information of the flue gas in each flue duct; planning the target inlet temperature of the SCR system for a future period according to the fluctuation information; mixing the first flue duct and the second flue duct in the mixing area, and determining whether to heat the mixing area based on the mixed flue gas information and the target inlet temperature of the SCR system; inputting the mixed flue gas into the SCR system, and obtaining the real-time SCR treatment information, and adjusting the heating amount of the mixing area according to the real-time SCR treatment information and the target inlet temperature of the SCR system for a future period. The adaptability of flue gas collection is improved, the desulfurization efficiency of the SCR system is ensured, and thus resources are saved.

Description

Technical Field

[0001] The present application relates to the technical field of tail gas treatment, and more specifically, to a method for collecting flue gas near the furnace to increase the SCR inlet temperature. Background Art

[0002] With the continuous improvement of environmental protection awareness, air pollution has become one of the important environmental protection issues globally. Among them, nitrogen oxides (NOx) emitted by coal-fired power plants are one of the main air pollution sources. To reduce the emission of NOx, the selective catalytic reduction (SCR) technology has become one of the most mature and effective denitrification methods currently. However, the performance of the SCR system is often affected by various factors, and one of them is the flue gas temperature.

[0003] In actual operation, to improve the denitrification efficiency of the SCR system, it is necessary to raise the flue gas temperature to an appropriate range as much as possible. However, for some large coal-fired power plants, due to the special structure of the boiler, the flue gas temperature near the furnace is low, making it difficult to meet the optimal reaction temperature requirements of the SCR catalyst. Therefore, collecting the flue gas near the furnace to increase the SCR inlet temperature has become an important technical challenge.

[0004] In the prior art, to collect the flue gas near the furnace to increase the SCR inlet temperature, usually only the flue gas or flue ducts are mixed and then input into the SCR system, without controlling the temperature of the mixed flue gas, resulting in unclear low denitrification efficiency of the SCR system and poor adaptability of flue gas collection.

[0005] Therefore, how to improve the denitrification efficiency of the SCR system and the adaptability of flue gas collection is a technical problem to be solved currently. Summary of the Invention

[0006] The present invention provides a method for collecting flue gas near the furnace to increase the SCR inlet temperature, aiming to solve the technical problems of low denitrification efficiency, poor adaptability of flue gas collection, and resource waste in the prior art. The method includes:

[0007] Obtain the historical information of the flue gas in each flue duct, and divide the flue ducts into a first flue duct and a second flue duct according to the historical information of the flue gas in each flue duct;

[0008] Obtain the real-time information of the flue gas in each flue duct, and determine the respective fluctuation information corresponding to the first flue duct and the second flue duct based on the real-time information of the flue gas in each flue duct;

[0009] Plan the target inlet temperature of the SCR system within a future period according to the fluctuation information;

[0010] Mix the first flue duct and the second flue duct in the mixing area, and obtain the information of the mixed flue gas. Determine whether to heat the mixing area based on the information of the mixed flue gas and the target inlet temperature of the SCR system;

[0011] Input the mixed flue gas into the SCR system, obtain the real-time SCR treatment information, and adjust the heating amount of the mixing area according to the real-time SCR treatment information and the target inlet temperature of the SCR system in a future period of time;

[0012] Among them, the first flue is the flue with high temperature and stable state, and the second flue is the flue with low temperature and stable state.

[0013] In some embodiments of the present application, the flue is divided into a first flue and a second flue according to the historical information of the flue gas of each flue, including:

[0014] The historical information of the flue gas includes the flue gas temperature and the flue gas source equipment information, and the flue gas source equipment information includes the operation index, the performance index and the flue gas emission index;

[0015] Determine the equipment state index according to the operation index, the performance index and the flue gas emission index;

[0016]

[0017] Among them, L is the equipment state index, α1 is the weight corresponding to the operation index, Q1 is the operation index, α2 is the weight corresponding to the performance index, Q2 is the performance index, α3 is the weight corresponding to the flue gas emission index, Q3 is the flue gas emission index, exp represents the exponential function, and k is a preset constant;

[0018] If the flue gas temperature is higher than the flue gas temperature threshold and the equipment state index is higher than the equipment state index threshold, then divide this flue into the first flue;

[0019] If the flue gas temperature is higher than the flue gas temperature threshold and the equipment state index is not higher than the equipment state index threshold, then calculate the difference between the flue gas temperature and the flue gas temperature threshold, and record it as the flue gas temperature deviation, calculate the difference between the equipment state index and the equipment state index threshold, and record it as the equipment state index deviation. If the flue gas temperature deviation of this flue is higher than the temperature deviation threshold and the equipment state index deviation is not higher than the equipment state index deviation threshold, then divide this flue into the first flue;

[0020] If the flue gas temperature is not higher than the flue gas temperature threshold and the equipment state index is higher than the equipment state index threshold, then divide this flue into the second flue;

[0021] If the flue gas temperature is not higher than the flue gas temperature threshold and the equipment state index is not higher than the equipment state index threshold, then judge the flue gas temperature deviation and the equipment state index deviation. If the flue gas temperature deviation is higher than the temperature deviation threshold and the equipment state index deviation is not higher than the equipment state index deviation threshold, then divide this flue into the second flue.

[0022] In some embodiments of the present application, determining the respective fluctuation information of the first flue and the second flue based on the real-time information of the flue gas includes:

[0023] The real-time information of the flue gas includes the real-time temperature of the flue gas and the real-time equipment status index, and the fluctuation information includes the fluctuation range of the flue gas temperature and the fluctuation range of the equipment status index;

[0024] Determining the temperature fluctuation factor based on the difference between the flue gas temperature and the real-time temperature of the flue gas, and determining the equipment status index fluctuation factor based on the difference between the equipment status index and the real-time equipment status index;

[0025] Obtaining the change trend of the flue gas temperature and the change trend of the equipment status index in a previous preset time period, predicting the future initial flue gas temperature fluctuation range based on the real-time temperature of the flue gas and the change trend of the flue gas temperature, and determining the future flue gas temperature fluctuation range based on the initial flue gas temperature fluctuation range and the temperature fluctuation factor;

[0026] Predicting the future initial equipment status index fluctuation range based on the real-time equipment status index and the change trend of the equipment status index, and determining the future equipment status index fluctuation range according to the initial equipment status index fluctuation range and the equipment status index fluctuation factor.

[0027] In some embodiments of the present application, planning the target inlet temperature of the SCR system in a future period according to the fluctuation information includes:

[0028] Establishing a temperature change curve based on the flue gas temperature fluctuation range, establishing an equipment status index change curve based on the equipment status index fluctuation range, and performing alignment processing on the temperature change curve and the equipment status index change curve;

[0029] Planning the target inlet temperature of the SCR system in a future period based on the temperature change curve and the equipment status index change curve.

[0030] In some embodiments of the present application, planning the target inlet temperature of the SCR system in a future period based on the temperature change curve and the equipment status index change curve includes:

[0031] Determining the corresponding maximum and minimum values based on the temperature change curve and the equipment status index change curve, respectively determining the first fluctuation amount and the second fluctuation amount according to the maximum and minimum values, determining the total fluctuation amount based on the first fluctuation amount and the second fluctuation amount, and obtaining the division length according to the total fluctuation amount;

[0032] Dividing the future period through the division length to obtain a plurality of future sub-periods, calculating the average temperature and the average equipment status index of each future sub-period, and determining the target inlet temperature of each future sub-period based on the average temperature and the average equipment status index, wherein there is a target inlet temperature corresponding to the average temperature and the average equipment status index together.

[0033] In some embodiments of the present application, it is determined whether to heat the mixing area based on the mixed flue gas information and the target inlet temperature of the SCR system, including:

[0034] The mixed flue gas information includes the mixed temperature and the mixed humidity;

[0035] If the mixed temperature is not lower than the target inlet temperature of the SCR system, the difference between the mixed temperature and the target inlet temperature of the SCR system does not exceed the preset temperature threshold, and the mixed humidity is not higher than the preset humidity threshold, then the mixing area is not heated;

[0036] If the mixed temperature is lower than the target inlet temperature of the SCR system, the difference between the mixed temperature and the target inlet temperature of the SCR system exceeds the preset temperature threshold, and the mixed humidity is higher than the preset humidity threshold, then the mixing area is heated.

[0037] In some embodiments of the present application, before adjusting the heating amount of the mixing area according to the real-time SCR processing information and the target inlet temperature of the SCR system in a future period of time, the method further includes:

[0038] The real-time SCR processing information includes the amount of inlet flue gas components and the amount of outlet flue gas components;

[0039] Based on the comparison of the amount of inlet flue gas components and the amount of outlet flue gas components, the active amount of the SCR catalyst is determined, and an active amount change curve of the SCR catalyst is established according to the active amount of the SCR catalyst.

[0040] In some embodiments of the present application, adjusting the heating amount of the mixing area according to the real-time SCR processing information and the target inlet temperature of the SCR system in a future period of time includes:

[0041] An SCR system target inlet temperature change curve and a mixed temperature change curve are established, and the active amount change curve of the SCR catalyst is aligned with the SCR system target inlet temperature change curve and the mixed temperature change curve, and multiple future sub-time periods are divided;

[0042] The height deviation amount between the SCR system target inlet temperature change curve and the mixed temperature change curve corresponding to each future sub-time period is determined, and the heating amount of the mixing area in the next future sub-time period is determined according to the height deviation amount and the active amount of the SCR catalyst.

[0043] By applying the above technical solution, historical information of flue gas in each flue is obtained, and the flues are divided into a first flue and a second flue according to the historical information of flue gas in each flue; real-time information of flue gas in each flue is obtained, and the corresponding fluctuation information of the first flue and the second flue is determined based on the real-time information of flue gas in each flue; the target inlet temperature of the SCR system within a future period of time is planned according to the fluctuation information; the first flue and the second flue are mixed in the mixing area, and the flue gas information after mixing is obtained, and it is judged whether to heat the mixing area based on the flue gas information after mixing and the target inlet temperature of the SCR system; the flue gas after mixing is input into the SCR system, and real-time SCR processing information is obtained, and the heating amount of the mixing area is adjusted according to the real-time SCR processing information and the target inlet temperature of the SCR system within a future period of time. In this application, by classifying the flues, the high-temperature flues and low-temperature flues are distinguished, the target inlet temperature of the SCR system is planned according to the fluctuation information, and the heating amount of the mixing area is adjusted according to the real-time SCR processing information. The adaptability of flue gas collection is improved, the desulfurization efficiency of the SCR system is ensured, and the influence on the activity of the SCR catalyst is taken into account, thereby saving resources. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for the description of the embodiments will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present application. For those skilled in the art, other drawings can be obtained based on these drawings without creative efforts.

[0045] Figure 1 The flowchart showing a method for collecting flue gas from an adjacent furnace to increase the SCR inlet temperature according to an embodiment of the present invention is shown. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0046] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some embodiments of the present application, rather than all embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present application without creative efforts shall fall within the protection scope of the present application.

[0047] An embodiment of the present application provides a method for collecting flue gas from an adjacent furnace to increase the SCR inlet temperature, as Figure 1 shown, the method includes the following steps:

[0048] Step S101, obtain historical information of flue gas in each flue, and divide the flues into a first flue and a second flue according to the historical information of flue gas in each flue.

[0049] In this embodiment, the first flue is a flue with a high temperature and a stable state, and the second flue is a flue with a low temperature and a stable state. The flues are divided into two types: high-temperature flues and low-temperature flues.

[0050] In some embodiments of the present application, the flues are divided into a first flue and a second flue according to the historical information of the flue gas of each flue, including:

[0051] The historical information of the flue gas includes the flue gas temperature and the flue gas source equipment information, and the flue gas source equipment information includes the operation index, the performance index, and the flue gas emission index;

[0052] Determine the equipment status index according to the operation index, the performance index, and the flue gas emission index;

[0053]

[0054] Wherein, L is the equipment status index, α1 is the weight corresponding to the operation index, Q1 is the operation index, α2 is the weight corresponding to the performance index, Q2 is the performance index, α3 is the weight corresponding to the flue gas emission index, Q3 is the flue gas emission index, exp represents the exponential function, and k is a preset constant;

[0055] If the flue gas temperature is higher than the flue gas temperature threshold and the equipment status index is higher than the equipment status index threshold, then divide this flue into the first flue;

[0056] If the flue gas temperature is higher than the flue gas temperature threshold and the equipment status index is not higher than the equipment status index threshold, then calculate the difference between the flue gas temperature and the flue gas temperature threshold, and record it as the flue gas temperature deviation, calculate the difference between the equipment status index and the equipment status index threshold, and record it as the equipment status index deviation. If the flue gas temperature deviation of this flue is higher than the temperature deviation threshold and the equipment status index deviation is not higher than the equipment status index deviation threshold, then divide this flue into the first flue;

[0057] If the flue gas temperature is not higher than the flue gas temperature threshold and the equipment status index is higher than the equipment status index threshold, then divide this flue into the second flue;

[0058] If the flue gas temperature is not higher than the flue gas temperature threshold and the equipment status index is not higher than the equipment status index threshold, then judge the flue gas temperature deviation and the equipment status index deviation. If the flue gas temperature deviation is higher than the temperature deviation threshold and the equipment status index deviation is not higher than the equipment status index deviation threshold, then divide this flue into the second flue.

[0059] In this embodiment, the operation index is an index synthesized according to operation parameters such as current and voltage, the performance index is an index synthesized according to performance parameters such as power, efficiency, and load rate, and the flue gas emission index is an index synthesized according to flue gas parameters such as flue gas volume, humidity, and composition.

[0060] In this embodiment, the equipment status index is the degree of equipment status temperature comprehensively determined based on the operation index, performance index, and flue gas emission index. The higher the equipment status index, the more stable the equipment. The above indexes are all historical averages.

[0061] In this embodiment, represents the correction of the total index, and its value range is between 0.1 and 0.15.

[0062] Step S102: Obtain the real-time information of the flue gas in each flue, and determine the corresponding fluctuation information of the first flue and the second flue based on the real-time information of the flue gas in each flue.

[0063] In this embodiment, the equipment corresponding to different flues may be different, and the flue gas temperature is also related to the equipment status.

[0064] In some embodiments of the present application, determining the corresponding fluctuation information of the first flue and the second flue based on the real-time information of the flue gas in each flue includes:

[0065] The real-time information of the flue gas includes the real-time temperature of the flue gas and the real-time equipment status index, and the fluctuation information includes the fluctuation range of the flue gas temperature and the fluctuation range of the equipment status index;

[0066] Determine the temperature fluctuation factor based on the difference between the flue gas temperature and the real-time temperature of the flue gas, and determine the equipment status index fluctuation factor based on the difference between the equipment status index and the real-time equipment status index;

[0067] Obtain the change trends of the flue gas temperature and the equipment status index in the previous preset time period, predict the future initial flue gas temperature fluctuation range based on the real-time temperature of the flue gas and the change trend of the flue gas temperature, and determine the future flue gas temperature fluctuation range based on the initial flue gas temperature fluctuation range and the temperature fluctuation factor;

[0068] Predict the future initial equipment status index fluctuation range based on the real-time equipment status index and the change trend of the equipment status index, and determine the future equipment status index fluctuation range according to the initial equipment status index fluctuation range and the equipment status index fluctuation factor.

[0069] In this embodiment, predicting the future initial flue gas temperature fluctuation range based on the real-time temperature of the flue gas and the change trend of the flue gas temperature means predicting the future situation based on the previous change trend, and the same applies to the equipment status index.

[0070] In this embodiment, determining the future flue gas temperature fluctuation range based on the initial flue gas temperature fluctuation range and the temperature fluctuation factor means that the future flue gas temperature fluctuation range is the product of the initial flue gas temperature fluctuation range and the temperature fluctuation factor, and the same applies to the equipment status index.

[0071] Step S103: Plan the target inlet temperature of the SCR system for a future period according to the fluctuation information.

[0072] In this embodiment, the target inlet temperature of the SCR system is the inlet temperature required by the SCR system to ensure the efficient operation of the SCR system.

[0073] In some embodiments of the present application, planning the target inlet temperature of the SCR system for a future period according to the fluctuation information includes:

[0074] Establish a temperature change curve based on the flue gas temperature fluctuation range, establish an equipment status index change curve based on the equipment status index fluctuation range, and align the temperature change curve and the equipment status index change curve;

[0075] Plan the target inlet temperature of the SCR system for a future period based on the temperature change curve and the equipment status index change curve.

[0076] In this embodiment, alignment means the alignment of the two curves on the time scale (abscissa).

[0077] In some embodiments of the present application, planning the target inlet temperature of the SCR system for a future period based on the temperature change curve and the equipment status index change curve includes:

[0078] Determine the corresponding maximum and minimum values based on the temperature change curve and the equipment status index change curve, determine the first fluctuation amount and the second fluctuation amount respectively according to the maximum and minimum values, determine the total fluctuation amount based on the first fluctuation amount and the second fluctuation amount, and obtain the division length according to the total fluctuation amount;

[0079] Divide the future period through the division length to obtain multiple future sub-periods, calculate the average temperature and the average equipment status index of each future sub-period, and determine the target inlet temperature of each future sub-period based on the average temperature and the average equipment status index, where the average temperature and the average equipment status index jointly correspond to a target inlet temperature.

[0080] In this embodiment, the maximum and minimum values refer to the maximum value and the minimum value, and a fluctuation amount (the first fluctuation amount and the second fluctuation amount) is determined based on the difference between the maximum value and the minimum value. The difference corresponds to a fluctuation amount.

[0081] Step S104: Mix the first flue and the second flue in the mixing area, obtain the flue gas information after mixing, and determine whether to heat the mixing area based on the flue gas information after mixing and the target inlet temperature of the SCR system.

[0082] In this embodiment, if the temperature of the flue gas after mixing does not meet the requirements, the mixing area needs to be heated.

[0083] In some embodiments of the present application, determining whether to perform heating in the mixing area based on the mixed flue gas information and the target inlet temperature of the SCR system includes:

[0084] The mixed flue gas information includes the mixed temperature and the mixed humidity;

[0085] If the mixed temperature is not lower than the target inlet temperature of the SCR system, the difference between the mixed temperature and the target inlet temperature of the SCR system does not exceed the preset temperature threshold, and the mixed humidity is not higher than the preset humidity threshold, then heating in the mixing area is not performed;

[0086] If the mixed temperature is lower than the target inlet temperature of the SCR system, the difference between the mixed temperature and the target inlet temperature of the SCR system exceeds the preset temperature threshold, and the mixed humidity is higher than the preset humidity threshold, then heating in the mixing area is performed.

[0087] In this embodiment, this condition means that the mixed temperature should meet the inlet temperature requirement, not too high or too low. Different humidities will affect the transfer of temperature, so it needs to be taken into account.

[0088] In this embodiment, for the remaining situations not mentioned, it depends on the actual situation.

[0089] In some embodiments of the present application, before adjusting the heating amount in the mixing area according to the real-time SCR processing information and the target inlet temperature of the SCR system in the next period of time, the method further includes:

[0090] The real-time SCR processing information includes the amount of inlet flue gas components and the amount of outlet flue gas components;

[0091] Based on the comparison of the amount of inlet flue gas components and the amount of outlet flue gas components, the active amount of the SCR catalyst is determined, and an active amount change curve of the SCR catalyst is established according to the active amount of the SCR catalyst.

[0092] In this embodiment, the amount of inlet flue gas components and the amount of outlet flue gas components refer to the types and proportions of pollutants contained in the flue gas. For example, nitrogen oxides, sulfur dioxide, particulate matter, etc.

[0093] In this embodiment, the activity of the SCR catalyst affects the desulfurization efficiency of the SCR system and also affects the inlet temperature requirement. Therefore, the activity of the SCR catalyst is judged by the amount of inlet flue gas components and the amount of outlet flue gas components here.

[0094] Step S105, input the mixed flue gas into the SCR system, obtain the real-time SCR processing information, and adjust the heating amount in the mixing area according to the real-time SCR processing information and the target inlet temperature of the SCR system in the next period of time.

[0095] In this embodiment, the heating amount of the mixing area is adjusted based on the activity of the SCR catalyst, the real-time SCR treatment information, and the target inlet temperature of the SCR system in a future period of time, so as to ensure that the flue gas meets the inlet requirements.

[0096] In some embodiments of the present application, the heating amount of the mixing area is adjusted according to the real-time SCR treatment information and the target inlet temperature of the SCR system in a future period of time, including:

[0097] Establish a target inlet temperature change curve of the SCR system and a mixing temperature change curve, align the activity amount change curve of the SCR catalyst with the target inlet temperature change curve and the mixing temperature change curve of the SCR system, and divide into multiple future sub-time periods;

[0098] Determine the height difference deviation amount between the target inlet temperature change curve and the mixing temperature change curve of the SCR system corresponding to each future sub-time period, and determine the heating amount of the mixing area in the next future sub-time period according to the height difference deviation amount and the activity amount of the SCR catalyst.

[0099] In this embodiment, the height difference deviation amount between the target inlet temperature change curve and the mixing temperature change curve of the SCR system corresponding to each future sub-time period refers to the difference between the ordinates of the two curves. The heating amount is determined according to the height difference deviation amount and the activity amount of the SCR catalyst (both are average values), and the two quantities jointly correspond to one heating amount. This correspondence relationship can be determined according to the principle formula or according to past experience.

[0100] It should be noted that the parameters such as the temperature mentioned above are not limited to point values, but can also be range values, which are not specifically limited here.

[0101] Through the description of the above embodiments, those skilled in the art can clearly understand that the present invention can be implemented by hardware, or can be implemented by means of software plus a necessary general hardware platform. Based on such an understanding, the technical solution of the present invention can be embodied in the form of a software product, which can be stored in a non-volatile storage medium (which can be a CD-ROM, a USB flash drive, a mobile hard disk, etc.), including several instructions for causing a computer device (which can be a personal computer, a server, or a network device, etc.) to execute the methods described in various implementation scenarios of the present invention.

[0102] By applying the above technical solutions, historical information of flue gas in each flue is obtained, and the flues are divided into a first flue and a second flue according to the historical information of flue gas in each flue; real-time information of flue gas in each flue is obtained, and the corresponding fluctuation information of the first flue and the second flue is determined based on the real-time information of flue gas in each flue; the target inlet temperature of the SCR system within a future period of time is planned according to the fluctuation information; the first flue and the second flue are mixed in the mixing area, and the flue gas information after mixing is obtained, and it is judged whether to heat the mixing area based on the flue gas information after mixing and the target inlet temperature of the SCR system; the flue gas after mixing is input into the SCR system, and real-time SCR treatment information is obtained, and the heating amount of the mixing area is adjusted according to the real-time SCR treatment information and the target inlet temperature of the SCR system within a future period of time. In this application, by classifying the flues, the high-temperature flue and the low-temperature flue are distinguished, the target inlet temperature of the SCR system is planned according to the fluctuation information, and the heating amount of the mixing area is adjusted according to the real-time SCR treatment information. The adaptability of flue gas collection is improved, the desulfurization efficiency of the SCR system is ensured, and the influence on the activity of the SCR catalyst is taken into account, thereby saving resources.

[0103] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some of the technical features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A method for collecting flue gas during furnace operation to increase the SCR inlet temperature, characterized in that, The method includes: Obtaining the historical information of the flue gas of each flue, and dividing the flues into a first flue and a second flue according to the historical information of the flue gas of each flue; Obtaining the real-time information of the flue gas of each flue, and determining the respective fluctuation information of the first flue and the second flue based on the real-time information of the flue gas of each flue; Planning the target inlet temperature of the SCR system within a future period according to the fluctuation information; Mixing the first flue and the second flue in the mixing area, obtaining the flue gas information after mixing, and judging whether to heat the mixing area based on the flue gas information after mixing and the target inlet temperature of the SCR system; Inputting the flue gas after mixing into the SCR system, obtaining the real-time SCR processing information, and adjusting the heating amount of the mixing area according to the real-time SCR processing information and the target inlet temperature of the SCR system within a future period; Wherein, the first flue is the flue with high temperature and stable state, and the second flue is the flue with low temperature and stable state.

2. The method for collecting in-furnace flue gas to increase the SCR inlet temperature according to claim 1, characterized in that Dividing the flues into a first flue and a second flue according to the historical information of the flue gas of each flue includes: The historical information of the flue gas includes the flue gas temperature and the flue gas source equipment information, and the flue gas source equipment information includes the operation index, the performance index and the flue gas emission index; Determining the equipment state index according to the operation index, the performance index and the flue gas emission index; Wherein, L is the equipment state index, α1 is the weight corresponding to the operation index, Q1 is the operation index, α2 is the weight corresponding to the performance index, Q2 is the performance index, α3 is the weight corresponding to the flue gas emission index, Q3 is the flue gas emission index, exp represents the exponential function, and k is a preset constant; If the flue gas temperature is higher than the flue gas temperature threshold and the equipment state index is higher than the equipment state index threshold, then divide this flue into the first flue; If the flue gas temperature is higher than the flue gas temperature threshold and the equipment state index is not higher than the equipment state index threshold, then calculate the difference between the flue gas temperature and the flue gas temperature threshold, and record it as the flue gas temperature deviation, calculate the difference between the equipment state index and the equipment state index threshold, and record it as the equipment state index deviation. If the flue gas temperature deviation of this flue is higher than the temperature deviation threshold and the equipment state index deviation is not higher than the equipment state index deviation threshold, then divide this flue into the first flue; If the flue gas temperature is not higher than the flue gas temperature threshold and the equipment state index is higher than the equipment state index threshold, then divide this flue into the second flue; If the flue gas temperature is not higher than the flue gas temperature threshold and the equipment state index is not higher than the equipment state index threshold, then judge the flue gas temperature deviation and the equipment state index deviation. If the flue gas temperature deviation is higher than the temperature deviation threshold and the equipment state index deviation is not higher than the equipment state index deviation threshold, then divide this flue into the second flue.

3. The method for collecting in-furnace flue gas to increase the SCR inlet temperature according to claim 2, characterized in that, Determining the respective fluctuation information of the first flue and the second flue based on the real-time information of the flue gas of each flue includes: The real-time information of the flue gas includes the real-time flue gas temperature and the real-time equipment state index, and the fluctuation information includes the flue gas temperature fluctuation range and the equipment state index fluctuation range; Determining the temperature fluctuation factor based on the difference between the flue gas temperature and the real-time flue gas temperature, and determining the equipment state index fluctuation factor based on the difference between the equipment state index and the real-time equipment state index; Obtain the variation trends of flue gas temperature and equipment status indicators in the previous preset time period, predict the future initial flue gas temperature fluctuation range based on the real-time flue gas temperature and the variation trend of flue gas temperature, and determine the future flue gas temperature fluctuation range based on the initial flue gas temperature fluctuation range and the temperature fluctuation factor; Predict the future initial equipment status indicator fluctuation range based on the real-time equipment status indicators and the variation trend of equipment status indicators, and determine the future equipment status indicator fluctuation range according to the initial equipment status indicator fluctuation range and the equipment status indicator fluctuation factor.

4. The method for collecting in-furnace flue gas to increase the SCR inlet temperature according to claim 3, wherein Plan the target inlet temperature of the SCR system for a future period according to the fluctuation information, including: Establish a temperature change curve based on the flue gas temperature fluctuation range, establish an equipment status indicator change curve based on the equipment status indicator fluctuation range, and align the temperature change curve and the equipment status indicator change curve; Plan the target inlet temperature of the SCR system for a future period based on the temperature change curve and the equipment status indicator change curve.

5. The method for collecting in-furnace flue gas to increase the SCR inlet temperature according to claim 4, characterized in that Plan the target inlet temperature of the SCR system for a future period based on the temperature change curve and the equipment status indicator change curve, including: Determine the corresponding maximum and minimum values based on the temperature change curve and the equipment status indicator change curve, determine the first fluctuation amount and the second fluctuation amount respectively according to the maximum and minimum values, determine the total fluctuation amount based on the first fluctuation amount and the second fluctuation amount, and obtain the division length according to the total fluctuation amount; Divide the future period through the division length to obtain multiple future sub-periods, calculate the average temperature and average equipment status indicators of each future sub-period, and determine the target inlet temperature of each future sub-period based on the average temperature and average equipment status indicators, where the average temperature and the average equipment status indicators jointly correspond to a target inlet temperature.

6. The method for collecting in-furnace flue gas to increase the SCR inlet temperature according to claim 1, characterized in that, Judge whether to perform heating in the mixing area based on the mixed flue gas information and the target inlet temperature of the SCR system, including: The mixed flue gas information includes the mixed temperature and the mixed humidity; If the mixed temperature is not lower than the target inlet temperature of the SCR system, the difference between the mixed temperature and the target inlet temperature of the SCR system does not exceed the preset temperature threshold, and the mixed humidity is not higher than the preset humidity threshold, then no heating is performed in the mixing area; If the mixed temperature is lower than the target inlet temperature of the SCR system, the difference between the mixed temperature and the target inlet temperature of the SCR system exceeds the preset temperature threshold, and the mixed humidity is higher than the preset humidity threshold, then heating is performed in the mixing area.

7. The method for collecting in-furnace flue gas to increase the SCR inlet temperature according to claim 5, characterized in that, Before adjusting the heating amount in the mixing area according to the real-time SCR processing information and the target inlet temperature of the SCR system for a future period, the method further includes: The real-time SCR processing information includes the inlet flue gas component amount and the outlet flue gas component amount; Compare the inlet flue gas component amount and the outlet flue gas component amount to determine the active amount of the SCR catalyst, and establish a change curve of the active amount of the SCR catalyst according to the active amount of the SCR catalyst.

8. The method according to claim 7, wherein Adjust the heating amount in the mixing area according to the real-time SCR processing information and the target inlet temperature of the SCR system for a future period, including: Establish the SCR system target inlet temperature change curve and the mixed temperature change curve, align the SCR catalyst activity amount change curve with the SCR system target inlet temperature change curve and the mixed temperature change curve, and divide into multiple future sub-time periods; Determine the height deviation amount between the SCR system target inlet temperature change curve and the mixed temperature change curve corresponding to each future sub-time period, and determine the heating amount of the mixing area in the next future sub-time period according to the height deviation amount and the SCR catalyst activity amount.

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