Denitration ammonia escape concentration determination method, device and equipment and storage medium

Abstract

The invention discloses a denitration ammonia escape concentration determination method, device and equipment and a storage medium. The method is applied to a flue gas treatment system and comprises the steps that flue gas treatment data of target flue gas during denitration treatment are obtained, the flue gas treatment data at least comprise denitration inlet data, denitration outlet data and actual flue gas flow velocity data, and the denitration inlet data and the denitration outlet data are acquired through an online monitoring instrument; the actual flue gas flow velocity data is acquired by flow velocity acquisition equipment; according to the denitration inlet data and the denitration outlet data, the compound denitration efficiency of the nitric oxide in the target flue gas is determined; according to the flue gas treatment data, the chemical denitration efficiency and the predetermined ammonia escape concentration function, the ammonia escape concentration of the target flue gas after denitration treatment is determined, the ammonia escape content of the flue gas at a denitration outlet can be obtained in real time, online monitoring of ammonia escape can be achieved, and technical support is provided for safe operation of a denitration system.

Description

Technical Field

[0001] The present invention relates to the technical field of flue gas denitration, and in particular to a method, device, equipment and storage medium for determining the escape concentration of denitration ammonia. Background Art

[0002] The main component of boiler flue gas is nitrogen oxides. Nitrogen oxides are one of the main pollutants in the atmosphere. At present, flue gas treatment at home and abroad usually requires the injection of reducing agent ammonia into the flue gas to reduce the nitrogen oxides in the flue gas to produce nitrogen. However, excessive injection of reducing agent ammonia will cause some ammonia to escape. Ammonia escape reacts chemically with sulfur trioxide in the flue gas to produce ammonium bisulfate, which will threaten the continuous and stable operation of the unit. At the same time, ammonium bisulfate and its salt deposits are highly acidic, and these precipitates can corrode the air preheater and subsequent equipment. Therefore, it is necessary to accurately monitor and control the ammonia escape concentration in the flue gas denitrification process to achieve the optimal injection amount of reducing agent ammonia and reduce the ammonia escape rate and the amount of ammonium bisulfate generated.

[0003] At present, the detection methods of ammonia escape content in the denitrification process include laser method and chemical absorption method. The laser method mostly adopts the in-situ through-type laser method and the extraction laser method. The in-situ through-type ammonia escape meter is easily affected by factors such as interference from high-concentration dust, single sampling position, and optical path drift caused by flue vibration; ammonia has strong adsorption and is very soluble in water. It is difficult for the extraction ammonia escape meter to ensure that the ammonia concentration in the flue gas does not change during the sampling process. Therefore, the measurement error of the online ammonia escape meter is relatively large. The chemical absorption method requires manual use of sampling tubes to collect flue gas at various positions on the flue section, and the flue gas is collected into an absorption bottle through a sampling pump. The absorption bottle contains a prepared ammonia absorption liquid (such as dilute sulfuric acid). The ammonia in the flue gas reacts with the absorption liquid to form ammonium salts. After the on-site sampling is completed, the absorption liquid is taken back to the laboratory for chemical analysis. Therefore, the use of chemical absorption method to detect ammonia escape concentration has the disadvantages of long detection cycle and inability to continuously monitor.

[0004] In summary, the current detection methods for ammonia escape content have technical problems such as low accuracy, low detection efficiency and inability to conduct continuous detection. Summary of the invention

[0005] The present invention provides a method, device, equipment and storage medium for determining the concentration of ammonia escape in denitrification, so as to obtain the ammonia escape content in the flue gas at the denitrification outlet in real time, realize online monitoring of ammonia escape and provide technical support for the safe operation of the denitrification system.

[0006] According to one aspect of the present invention, a method for determining the escape concentration of denitrification ammonia is provided, which is applied to a flue gas treatment system, wherein the flue gas treatment equipment is provided with an economizer, a denitrifier, an air preheater, a dust collector, an induced draft fan and a desulfurizer in sequence; wherein two groups of online monitoring instruments are provided at the inlet and outlet of the denitrifier, respectively, and a flow rate collection device is provided at the outlet of the dust collector;

[0007] The method comprises:

[0008] Obtaining flue gas treatment data of the target flue gas during denitration treatment, the flue gas treatment data at least including denitration inlet data, denitration outlet data and actual flue gas flow rate data, the denitration inlet data and the denitration outlet data are acquired by the online monitoring instrument, and the actual flue gas flow rate data is acquired by the flow rate acquisition device;

[0009] Determining the denitration efficiency of nitrogen oxides in the target flue gas according to the denitration inlet data and the denitration outlet data;

[0010] The ammonia escape concentration of the target flue gas after denitrification treatment is determined according to the flue gas treatment data, the chemical denitrification efficiency and a predetermined ammonia escape concentration function, wherein the ammonia escape concentration function is obtained according to an ammonia-nitrogen molar ratio function.

[0011] According to another aspect of the present invention, a device for determining the escape concentration of denitrification ammonia is provided, which is applied to a flue gas treatment system, wherein the flue gas treatment equipment is provided with an economizer, a denitrifier, an air preheater, a dust collector, an induced draft fan and a desulfurizer in sequence; wherein two groups of online monitoring instruments are provided at the inlet and outlet of the denitrifier, respectively, and a flow rate collection device is provided at the outlet of the dust collector;

[0012] The device comprises:

[0013] A flue gas treatment data acquisition module, used to acquire flue gas treatment data of the target flue gas during denitration treatment, wherein the flue gas treatment data at least includes denitration inlet data, denitration outlet data and actual flue gas flow rate data, wherein the denitration inlet data and the denitration outlet data are acquired through the online monitoring instrument, and the actual flue gas flow rate data are acquired through the flow rate acquisition device;

[0014] A chemical denitration efficiency determination module, used to determine the chemical denitration efficiency of nitrogen oxides in the target flue gas according to the denitration inlet data and the denitration outlet data;

[0015] The ammonia escape concentration determination module is used to determine the ammonia escape concentration of the target flue gas after denitrification treatment according to the flue gas treatment data, the chemical denitrification efficiency and a predetermined ammonia escape concentration function, wherein the ammonia escape concentration function is obtained according to an ammonia-nitrogen molar ratio function.

[0016] According to another aspect of the present invention, an electronic device is provided, the electronic device comprising:

[0017] at least one processor; and

[0018] a memory communicatively connected to the at least one processor; wherein,

[0019] The memory stores a computer program that can be executed by the at least one processor, and the computer program is executed by the at least one processor so that the at least one processor can execute the method for determining the denitrification ammonia escape concentration described in any embodiment of the present invention.

[0020] According to another aspect of the present invention, a computer-readable storage medium is provided, wherein the computer-readable storage medium stores computer instructions, and the computer instructions are used to enable a processor to implement the method for determining the escape concentration of denitrification ammonia as described in any embodiment of the present invention when executed.

[0021] The technical solution of the embodiment of the present invention obtains the flue gas treatment data of the target flue gas during the denitrification treatment, and the flue gas treatment data at least includes the denitrification inlet data, the denitrification outlet data and the actual flue gas flow rate data. According to the denitrification inlet data and the denitrification outlet data, the chemical denitrification efficiency of nitrogen oxides in the target flue gas is determined. According to the flue gas treatment data, the chemical denitrification efficiency and the predetermined ammonia escape concentration function, the ammonia escape concentration of the target flue gas after the denitrification treatment is determined, which solves the problem that the online optical ammonia escape analyzer has a large measurement error due to the influence of factors such as the interference of high-concentration dust on site and the optical path drift caused by the flue vibration, and the denitrification ammonia escape is difficult to measure accurately. The ammonia escape content in the flue gas at the denitrification outlet can be obtained in real time, and the ammonia escape can be monitored online, providing technical support for the safe operation of the denitrification system.

[0022] It should be understood that the contents described in this section are not intended to identify the key or important features of the embodiments of the present invention, nor are they intended to limit the scope of the present invention. Other features of the present invention will become easily understood through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0024] Figure 1 A schematic diagram of a flue gas treatment system is provided according to Embodiment 1 of the present invention;

[0025] Figure 2 This is a flow chart of a method for determining the escape concentration of denitrification ammonia provided in accordance with the first embodiment of the present invention;

[0026] Figure 3 This is a flow chart of a method for determining the escape concentration of denitrification ammonia provided in accordance with Embodiment 2 of the present invention;

[0027] Figure 4 is a structural diagram of a device for determining the escape concentration of denitrification ammonia provided according to Embodiment 3 of the present invention;

[0028] Figure 5 It is a schematic diagram of the structure of an electronic device for implementing the method for determining the escape concentration of denitrification ammonia according to an embodiment of the present invention. DETAILED DESCRIPTION

[0029] In order to enable those skilled in the art to better understand the scheme of the present invention, the technical scheme in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0030] It should be noted that the terms "first", "second", etc. in the specification and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the present invention described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units that are clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0031] Embodiment 1

[0032] Figure 1 A schematic diagram of a flue gas treatment system is provided for the first embodiment of the present invention. Figure 1 As shown, the flue gas treatment equipment is provided with an economizer, a denitrifier, an air preheater, a dust collector, an induced draft fan and a desulfurizer in sequence; wherein, at the inlet of the denitrifier (i.e. Figure 1 ① in the middle) and the exit (i.e. Figure 1 Two sets of online monitoring instruments are respectively arranged at the outlet of the dust collector (i.e. Figure 1 A flow velocity collection device is provided at position ③ in the figure.

[0033] The online monitoring instrument can collect denitrification inlet data and denitrification outlet data. It should be noted that the denitrification inlet data may refer to the flue gas data entering the denitrifier, and the denitrification outlet data may refer to the flue gas data flowing out of the denitrifier. Exemplarily, the denitrification inlet data may include ammonia supply flow rate, ammonia nitrogen compound concentration, flue gas temperature and flue gas pressure, etc. The denitrification outlet data may include ammonia nitrogen compound concentration, flue gas temperature and flue gas pressure, etc.

[0034] It should be noted that the principle of measuring the concentration of ammonia nitrogen compounds at the inlet and outlet of the denitrifier is the extraction optical method. Since ammonia nitrogen compounds are insoluble in water, the sampling pipeline is equipped with pre-treatment devices such as full-process dehumidification and dust removal. The site is equipped with ammonia nitrogen compound standard gas of different concentrations, high, medium and low, which can be calibrated and maintained regularly to ensure measurement accuracy. The instrument for measuring the ammonia supply flow can be a mass flow meter, which can also ensure measurement accuracy.

[0035] Figure 2 A flowchart of a method for determining ammonia escape concentration of denitrification is provided for the first embodiment of the present invention. This embodiment is applicable to the case of determining ammonia escape concentration during flue gas treatment. The method can be performed by a device for determining ammonia escape concentration of denitrification. The device for determining ammonia escape concentration of denitrification can be implemented in the form of hardware and / or software. The device for determining ammonia escape concentration of denitrification can be configured in an electronic device. Figure 2 As shown, the method includes:

[0036] S101. Obtain flue gas treatment data of target flue gas during denitrification treatment.

[0037] The target flue gas may refer to the flue gas to be denitrified. It is worth noting that the flue gas treatment data at least includes denitrification inlet data, denitrification outlet data and actual flue gas flow rate data.

[0038] Specifically, the denitrification inlet data and the denitrification outlet data are collected by online monitoring instruments arranged at the inlet and outlet of the denitrifier, and the actual flue gas flow velocity data are collected by the velocity collection device.

[0039] It should be noted that the flow rate collection device is preferably an S-type pitot tube. The S-type pitot tube is composed of two identical metal tubes connected in parallel. The measuring end has two openings in opposite directions. During measurement, the pressure measured at the opening facing the airflow is the total pressure, and the pressure measured at the opening facing away from the airflow is the static pressure. The total pressure = dynamic pressure + static pressure, and the flow rate of the exhaust is proportional to the square root of its dynamic pressure.

[0040] It needs to be explained that according to Figure 1 It can be seen that the denitration period is arranged between the boiler economizer and the air preheater. The smoke content in this area is about 25g / m 3 ~50g / m3 The smoke content is high, which can easily block the two sampling ports of the pitot tube; moreover, although a flue gas guide plate is set between the boiler economizer and the denitrification inlet, it is still impossible to ensure that the flue gas flow rate is evenly distributed under different load conditions. Therefore, it is difficult to ensure the measurement accuracy when a flow rate collection device is set at the denitrification inlet. Therefore, the present invention sets the flow rate collection device between the dust collector outlet and the induced draft fan inlet (i.e. Figure 1 ③). After the flue gas is purified by the dust collector, the dust concentration is 20mg / m 3 The following can effectively prevent smoke particles from clogging the Pitot tube. In addition, the flue gas velocity distribution at the dust collector outlet is relatively uniform, and the induced draft fan inlet is a negative pressure area. It is very appropriate to set the velocity measurement point in this area.

[0041] S102. Determine the denitration efficiency of nitrogen oxides in the target flue gas according to the denitration inlet data and the denitration outlet data.

[0042] The chemical denitrification efficiency may refer to the denitrification efficiency of the target flue gas.

[0043] Specifically, the denitrification efficiency of nitrogen oxides in the target flue gas is calculated based on the inlet nitrogen oxide concentration and the outlet nitrogen oxide concentration of the denitrifier.

[0044] Exemplarily, determining the denitrification efficiency of nitrogen oxides in the target flue gas based on the denitrification inlet data and the denitrification outlet data includes: determining a first nitrogen oxide concentration at the inlet of the denitrifier based on the denitrification inlet data; determining a second nitrogen oxide concentration at the outlet of the denitrifier based on the denitrification outlet data; and determining the denitrification efficiency of nitrogen oxides based on the first nitrogen oxide concentration and the second nitrogen oxide concentration.

[0045] The first nitrogen oxide concentration may refer to the nitrogen oxide concentration at the inlet of the denitrifier, and the second nitrogen oxide concentration may refer to the nitrogen oxide concentration at the outlet of the denitrifier.

[0046] Specifically, the difference between the first nitrogen oxide concentration and the second nitrogen oxide concentration is calculated, and the percentage value of the difference to the first nitrogen oxide concentration is determined as the denitrification efficiency.

[0047] S103, determining the ammonia escape concentration of the target flue gas after denitrification treatment according to the flue gas treatment data, the chemical denitrification efficiency and a predetermined ammonia escape concentration function.

[0048] Wherein, the ammonia escape concentration function is obtained according to the ammonia nitrogen molar ratio function. Exemplarily, the ammonia nitrogen molar ratio function is as follows:

[0049]

[0050] Among them, C 氨逃逸 Refers to the ammonia escape concentration, mg / m 3 ; Refers to the ammonia supply flow rate, kg / h; It refers to the molar mass of NO2, g / mol; Q refers to the dry-basis flue gas flow rate of the target flue gas; It refers to the molar mass of NH3, g / mol; η refers to the denitrification efficiency of the compound; It can refer to the nitrogen oxide input concentration, mg / m 3 .

[0051] Specifically, it can be seen from the ammonia nitrogen molar ratio function that the various parameters required by the ammonia nitrogen molar ratio function can be obtained through the flue gas treatment data and the chemical denitrification efficiency, that is, based on the flue gas treatment data, the chemical denitrification efficiency and the ammonia escape concentration function, the ammonia escape concentration of the target flue gas after denitrification treatment can be determined.

[0052] Exemplarily, the process of determining the ammonia escape concentration function includes:

[0053] Constructing a first ammonia-nitrogen molar ratio function according to an ammonia supply flow element, an ammonia molar mass element, a dry-basis flue gas flow element, a nitrogen oxide input concentration element, and a nitrogen dioxide molar mass element;

[0054] Constructing a second ammonia-nitrogen molar ratio function according to the ammonia escape concentration element, the ammonia reaction concentration element, the ammonia molar mass element, the nitrogen oxide input concentration element and the nitrogen dioxide molar mass element;

[0055] An ammonia escape concentration function is determined based on the first ammonia nitrogen molar ratio function and the second ammonia nitrogen molar ratio function.

[0056] Exemplarily, determining the ammonia escape concentration function according to the first ammonia nitrogen molar ratio function and the second ammonia nitrogen molar ratio function includes:

[0057] Transforming the first ammonia nitrogen molar ratio function to obtain a first transformed molar ratio function;

[0058] Based on the denitrification reaction mechanism, the second ammonia nitrogen molar ratio function is transformed to obtain a second transformed molar ratio function;

[0059] The first transformation molar ratio function and the second transformation molar ratio function are integrated to obtain an ammonia escape concentration function.

[0060] It should be noted that the first ammonia nitrogen mole ratio function and the second ammonia nitrogen mole ratio function are currently commonly used ammonia nitrogen mole ratio determination functions. The difference between the first ammonia nitrogen mole ratio function and the second ammonia nitrogen mole ratio function is that they are constructed using different constituent elements.

[0061] Specifically, the first ammonia nitrogen molar ratio function is as follows:

[0062]

[0063] in, Refers to the ammonia supply flow element, kg / h; It refers to the molar mass element of NO2, g / mol; Q refers to the dry-basis flue gas flow element of the target flue gas; It refers to the molar mass of NH3, g / mol; It can refer to the nitrogen oxide input concentration element, mg / m 3 .

[0064] The first ammonia nitrogen molar ratio function is transformed, and the obtained first transformed molar ratio function can be shown as follows:

[0065]

[0066] The second ammonia nitrogen molar ratio function is as follows:

[0067]

[0068] Among them, C 氨逃逸 Refers to the ammonia escape concentration element, mg / m 3 ; C 氨反应 Refers to the ammonia escape concentration element, mg / m 3 ; It refers to the molar mass element of NO2, g / mol; It refers to the molar mass of NH3 element, g / mol; It can refer to the nitrogen oxide input concentration element, mg / m 3 .

[0069] The desulfurization reaction mechanism is as follows:

[0070] 4NH3+4NO+O2=4N2+6H2O;

[0071] From the denitrification reaction mechanism, it can be seen that removing 1 mol of NO requires 1 mol of NH3, and the molar ratio of NO to NH3 is 1: 1. It should be noted that NO accounts for 95% of the NOx in the target flue gas, and the denitrification reaction mechanism is the main reaction formula for NOx removal.

[0072] According to the denitrification reaction mechanism, the second ammonia nitrogen molar ratio function can be further transformed as shown below:

[0073]

[0074] Among them, C氨逃逸 Refers to the ammonia escape concentration element, mg / m 3 ; C 氨反应 Refers to the ammonia escape concentration element, mg / m 3 ; It refers to the molar mass element of NO2, g / mol; It refers to the molar mass of NH3, g / mol; It can refer to the nitrogen oxide input concentration element, mg / m 3 ; It can refer to the NOx output concentration element, mg / m 3 .

[0075] The first transformation molar ratio function and the second transformation molar ratio function are integrated and processed as shown below:

[0076]

[0077] After transformation, the ammonia nitrogen molar ratio function can be obtained as shown below:

[0078]

[0079] The technical solution of the embodiment of the present invention obtains the flue gas treatment data of the target flue gas during the denitrification treatment, and the flue gas treatment data at least includes the denitrification inlet data, the denitrification outlet data and the actual flue gas flow rate data. According to the denitrification inlet data and the denitrification outlet data, the chemical denitrification efficiency of nitrogen oxides in the target flue gas is determined. According to the flue gas treatment data, the chemical denitrification efficiency and the predetermined ammonia escape concentration function, the ammonia escape concentration of the target flue gas after the denitrification treatment is determined, which solves the problem that the online optical ammonia escape analyzer has a large measurement error due to the influence of factors such as the interference of high-concentration dust on site and the optical path drift caused by the flue vibration, and the denitrification ammonia escape is difficult to measure accurately. The ammonia escape content in the flue gas at the denitrification outlet can be obtained in real time, and the ammonia escape can be monitored online, providing technical support for the safe operation of the denitrification system.

[0080] Embodiment 2

[0081] Figure 3 This is a flow chart of a method for determining the ammonia escape concentration of denitrification provided in the second embodiment of the present invention. Based on the above embodiments, this embodiment further refines the determination of the ammonia escape concentration of the target flue gas after denitrification. Figure 3 As shown, the method includes:

[0082] S201. Obtain flue gas treatment data of target flue gas during denitrification treatment.

[0083] S202. Determine the denitrification efficiency of nitrogen oxides in the target flue gas according to the denitrification inlet data and the denitrification outlet data.

[0084] S203: Determine dry-basis flue gas flow data according to the actual flue gas flow rate data in the flue gas processing data.

[0085] It should be noted that the dry-basis flue gas flow rate can be transformed according to the actual flue gas flow rate data in the flue gas treatment data, and the dry-basis flue gas flow rate data can be obtained by combining the flue cross-sectional area. In other words, the flow problem can be converted into a flow rate problem by utilizing the flue cross-sectional area.

[0086] Exemplarily, determining the dry-basis flue gas flow rate data according to the actual flue gas flow rate data in the flue gas processing data includes:

[0087] Determine actual flue gas flow data according to the actual flue gas flow velocity data and the cross-sectional area of ​​the denitrification pipeline;

[0088] Based on the ideal gas law, dry-basis flue gas flow data of the actual flue gas flow data under standard conditions is determined according to the actual flue gas flow data, and the actual flue gas temperature and the actual flue gas pressure corresponding to the actual flue gas flow data.

[0089] Specifically, the actual flue gas flow data can be determined by the product of the actual flue gas flow velocity data and the cross-sectional area of ​​the denitrification pipeline, that is, Q = v × S, v is the actual flue gas flow velocity data (m / s), S is the cross-sectional area of ​​the flue (m 2 ).

[0090] Through the ideal gas law, the wet flue gas volume flow rate under actual conditions is converted to the volume flow rate under standard conditions (usually a temperature of 0°C or 273.15K and a pressure of 1atm or 101.325kPa), so that the dry-basis flue gas flow data can be obtained.

[0091] Exemplarily, before determining the dry-base flue gas flow data of the actual flue gas flow data under a standard state, the method further includes:

[0092] Based on the ideal gas law, according to the actual flue gas flow data, the actual flue gas temperature and the actual flue gas pressure, determine the standard state flue gas flow data of the actual flue gas flow data under the standard state;

[0093] According to the water volume in the standard state flue gas flow data, the dry-base flue gas flow data of the actual flue gas flow data under the standard state is determined.

[0094] Specifically, the settlement result is determined as standard state flue gas flow data based on the ideal gas law using the actual flue gas flow data, the actual flue gas temperature and the actual flue gas pressure. For example, the ideal gas law is as follows:

[0095]

[0096] Among them, Q is the index state flue gas flow data; q is the actual flue gas flow data; T is the index state temperature; P is the index state pressure; t is the actual flue gas temperature; t is the actual flue gas pressure.

[0097] Further, the difference between the standard-state flue gas flow data and the moisture volume may be determined as the standard-state flue gas flow data.

[0098] For example, it is assumed that the actual flue gas temperature t = 150 ° C = 423.15 K, the actual flue gas pressure p = 100 kPa, the actual flue gas flow data v = 10 m / s and the pipe cross-sectional area A = 2 m 2 .

[0099] Then, the actual flue gas flow data q = 10m / s×2m 2 =20m 3 / s. Converted to standard flue gas flow data under standard conditions

[0100] Assume that the volume occupied by water is Qwater = 2m 3 / s, then the dry flue gas flow rate is Qdry_std=30.99m 3 / s-2m 3 / s=28.99m 3 / s.

[0101] The ideal gas law is used to calculate the standard flue gas flow data, and then the water volume is excluded, thereby improving the accuracy of the dry-basis flue gas flow data.

[0102] Exemplarily, before determining the dry-based flue gas flow data of the actual flue gas flow data under standard conditions, it also includes: determining the flue gas leakage rate between the denitrifier outlet and the dust collector outlet, and determining the flue gas leakage flow data based on the flue gas leakage rate; determining the dry-based flue gas flow data based on the flue gas leakage flow data and the actual flue gas flow data.

[0103] Specifically, in order to further improve the accuracy of determining the dry-basis flue gas flow data, the present invention further determines the flue gas leakage rate between the denitrifier outlet and the dust collector outlet, and then calculates the flue gas leakage flow data based on the flue gas leakage rate, and then calculates the dry-basis flue gas flow data at the denitrifier outlet based on the flue gas leakage flow data.

[0104] S204, inputting the denitrification inlet data, the denitrification outlet data, the chemical denitrification efficiency and the dry-basis flue gas flow data into the ammonia escape concentration function to determine the ammonia escape concentration of the target flue gas after denitrification treatment.

[0105] The technical solution of the present invention, based on the ideal gas law, substitutes the actual flue gas flow data, actual flue gas temperature and actual flue gas pressure, so as to determine the standard flue gas flow data under standard conditions, and further considers the moisture volume and air leakage flow data, so as to ensure the accuracy of determining the dry-based flue gas flow data, thereby improving the accuracy of determining the ammonia escape concentration.

[0106] Embodiment 3

[0107] Figure 4 A schematic diagram of the structure of a device for determining the escape concentration of denitrification ammonia provided in the third embodiment of the present invention. The device is applied to a flue gas treatment system, wherein the flue gas treatment equipment is provided with an economizer, a denitrifier, an air preheater, a dust collector, an induced draft fan and a desulfurizer in sequence; wherein two sets of online monitoring instruments are provided at the inlet and outlet of the denitrifier, respectively, and a flow rate collection device is provided at the outlet of the dust collector;

[0108] like Figure 4 As shown, the device comprises:

[0109] The flue gas treatment data acquisition module 301 is used to obtain the flue gas treatment data of the target flue gas during the denitration treatment, wherein the flue gas treatment data at least includes denitration inlet data, denitration outlet data and actual flue gas flow rate data, wherein the denitration inlet data and the denitration outlet data are acquired by the online monitoring instrument, and the actual flue gas flow rate data are acquired by the flow rate acquisition device;

[0110] A chemical denitration efficiency determination module 302, for determining the chemical denitration efficiency of nitrogen oxides in the target flue gas according to the denitration inlet data and the denitration outlet data;

[0111] The ammonia escape concentration determination module 303 is used to determine the ammonia escape concentration of the target flue gas after denitrification treatment according to the flue gas treatment data, the chemical denitrification efficiency and a predetermined ammonia escape concentration function, wherein the ammonia escape concentration function is obtained according to an ammonia nitrogen molar ratio function.

[0112] The technical solution of the embodiment of the present invention obtains the flue gas treatment data of the target flue gas during the denitrification treatment, and the flue gas treatment data at least includes the denitrification inlet data, the denitrification outlet data and the actual flue gas flow rate data. According to the denitrification inlet data and the denitrification outlet data, the chemical denitrification efficiency of nitrogen oxides in the target flue gas is determined. According to the flue gas treatment data, the chemical denitrification efficiency and the predetermined ammonia escape concentration function, the ammonia escape concentration of the target flue gas after the denitrification treatment is determined, which solves the problem that the online optical ammonia escape analyzer has a large measurement error due to the influence of factors such as the interference of high-concentration dust on site and the optical path drift caused by the flue vibration, and the denitrification ammonia escape is difficult to measure accurately. The ammonia escape content in the flue gas at the denitrification outlet can be obtained in real time, and the ammonia escape can be monitored online, providing technical support for the safe operation of the denitrification system.

[0113] Optionally, the device further comprises an ammonia escape concentration function determination module.

[0114] Ammonia escape concentration function determination module, including:

[0115] A first function determination unit is used to construct a first ammonia-nitrogen molar ratio function according to an ammonia supply flow element, an ammonia molar mass element, a dry-basis flue gas flow element, a nitrogen oxide input concentration element, and a nitrogen dioxide molar mass element;

[0116] A second function determination unit is used to construct a second ammonia-nitrogen molar ratio function according to an ammonia escape concentration element, an ammonia reaction concentration element, the ammonia molar mass element, the nitrogen oxide input concentration element and the nitrogen dioxide molar mass element;

[0117] An ammonia escape concentration function determining unit is used to determine an ammonia escape concentration function according to the first ammonia nitrogen molar ratio function and the second ammonia nitrogen molar ratio function.

[0118] Optionally, the ammonia escape concentration function determination unit is specifically used to:

[0119] Transforming the first ammonia nitrogen molar ratio function to obtain a first transformed molar ratio function;

[0120] Based on the denitrification reaction mechanism, the second ammonia nitrogen molar ratio function is transformed to obtain a second transformed molar ratio function;

[0121] The first transformation molar ratio function and the second transformation molar ratio function are integrated to obtain an ammonia escape concentration function.

[0122] Optionally, the ammonia slip concentration determination module 303 includes:

[0123] A dry-basis flue gas flow determination unit, configured to determine dry-basis flue gas flow data according to the actual flue gas flow rate data in the flue gas processing data;

[0124] The ammonia escape concentration determination unit is used to input the denitration inlet data, the denitration outlet data, the chemical denitration efficiency and the dry-base flue gas flow data into the ammonia escape concentration function to determine the ammonia escape concentration of the target flue gas after denitration treatment.

[0125] Optionally, the dry-basis flue gas flow determination unit comprises:

[0126] An actual flue gas flow determination subunit, used to determine actual flue gas flow data according to the actual flue gas flow velocity data and the cross-sectional area of ​​the denitrification pipeline;

[0127] The dry-basis flue gas flow determination subunit is used to determine the dry-basis flue gas flow data of the actual flue gas flow data under standard conditions based on the ideal gas law, according to the actual flue gas flow data, and the actual flue gas temperature and actual flue gas pressure corresponding to the actual flue gas flow data.

[0128] Optionally, the dry-basis flue gas flow determination subunit is specifically used for:

[0129] Before determining the dry-base flue gas flow data of the actual flue gas flow data under the standard state, based on the ideal gas law, according to the actual flue gas flow data, the actual flue gas temperature and the actual flue gas pressure, determine the standard-state flue gas flow data of the actual flue gas flow data under the standard state;

[0130] According to the water volume in the standard state flue gas flow data, the dry-base flue gas flow data of the actual flue gas flow data under the standard state is determined.

[0131] Optionally, the dry-basis flue gas flow determination subunit is specifically used for:

[0132] Before determining the dry-base flue gas flow data of the actual flue gas flow data under the standard state, determining the flue gas leakage rate between the outlet of the denitrifier and the outlet of the dust collector, and determining the flue gas leakage flow data according to the flue gas leakage rate;

[0133] The dry-base smoke flow data is determined according to the smoke leakage flow data and the actual smoke flow data.

[0134] The device for determining the escape concentration of denitrification ammonia provided in the embodiment of the present invention can execute the method for determining the escape concentration of denitrification ammonia provided in any embodiment of the present invention, and has the corresponding functional modules and beneficial effects of the execution method.

[0135] Embodiment 4

[0136] Figure 5 A schematic diagram of the structure of an electronic device 10 that can be used to implement an embodiment of the present invention is shown. The electronic device is intended to represent various forms of digital computers, such as laptop computers, desktop computers, workstations, personal digital assistants, servers, blade servers, mainframe computers, and other suitable computers. The electronic device can also represent various forms of mobile devices, such as personal digital processing, cellular phones, smart phones, wearable devices (such as helmets, glasses, watches, etc.) and other similar computing devices. The components shown herein, their connections and relationships, and their functions are merely examples and are not intended to limit the implementation of the present invention described and / or required herein.

[0137] like Figure 5 As shown, the electronic device 10 includes at least one processor 11, and a memory connected to the at least one processor 11, such as a read-only memory (ROM) 12, a random access memory (RAM) 13, etc., wherein the memory stores a computer program that can be executed by at least one processor, and the processor 11 can perform various appropriate actions and processes according to the computer program stored in the read-only memory (ROM) 12 or the computer program loaded from the storage unit 18 to the random access memory (RAM) 13. In the RAM 13, various programs and data required for the operation of the electronic device 10 can also be stored. The processor 11, the ROM 12, and the RAM 13 are connected to each other through a bus 14. An input / output (I / O) interface 15 is also connected to the bus 14.

[0138] A number of components in the electronic device 10 are connected to the I / O interface 15, including: an input unit 16, such as a keyboard, a mouse, etc.; an output unit 17, such as various types of displays, speakers, etc.; a storage unit 18, such as a disk, an optical disk, etc.; and a communication unit 19, such as a network card, a modem, a wireless communication transceiver, etc. The communication unit 19 allows the electronic device 10 to exchange information / data with other devices through a computer network such as the Internet and / or various telecommunication networks.

[0139] The processor 11 may be a variety of general and / or special processing components with processing and computing capabilities. Some examples of the processor 11 include, but are not limited to, a central processing unit (CPU), a graphics processing unit (GPU), various dedicated artificial intelligence (AI) computing chips, various processors running machine learning model algorithms, a digital signal processor (DSP), and any appropriate processor, controller, microcontroller, etc. The processor 11 executes the various methods and processes described above, such as the method for determining the denitrification ammonia escape concentration.

[0140] In some embodiments, the method for determining the ammonia escape concentration of denitrification may be implemented as a computer program, which is tangibly contained in a computer-readable storage medium, such as a storage unit 18. In some embodiments, part or all of the computer program may be loaded and / or installed on the electronic device 10 via the ROM 12 and / or the communication unit 19. When the computer program is loaded into the RAM 13 and executed by the processor 11, one or more steps of the method for determining the ammonia escape concentration of denitrification described above may be performed. Alternatively, in other embodiments, the processor 11 may be configured to perform the method for determining the ammonia escape concentration of denitrification by any other appropriate means (e.g., by means of firmware).

[0141] Various implementations of the systems and techniques described above herein can be implemented in digital electronic circuit systems, integrated circuit systems, field programmable gate arrays (FPGAs), application specific integrated circuits (ASICs), application specific standard products (ASSPs), systems on chips (SOCs), load programmable logic devices (CPLDs), computer hardware, firmware, software, and / or combinations thereof. These various implementations can include: being implemented in one or more computer programs that can be executed and / or interpreted on a programmable system including at least one programmable processor, which can be a special purpose or general purpose programmable processor that can receive data and instructions from a storage system, at least one input device, and at least one output device, and transmit data and instructions to the storage system, the at least one input device, and the at least one output device.

[0142] Computer programs for implementing the methods of the present invention may be written in any combination of one or more programming languages. These computer programs may be provided to a processor of a general-purpose computer, a special-purpose computer, or other programmable data processing device, so that when the computer program is executed by the processor, the functions / operations specified in the flow chart and / or block diagram are implemented. The computer program may be executed entirely on the machine, partially on the machine, partially on the machine and partially on a remote machine as a stand-alone software package, or entirely on a remote machine or server.

[0143] In the context of the present invention, a computer-readable storage medium may be a tangible medium that may contain or store a computer program for use by or in combination with an instruction execution system, device or equipment. A computer-readable storage medium may include, but is not limited to, electronic, magnetic, optical, electromagnetic, infrared, or semiconductor systems, devices or equipment, or any suitable combination of the foregoing. Alternatively, a computer-readable storage medium may be a machine-readable signal medium. A more specific example of a machine-readable storage medium may include an electrical connection based on one or more lines, a portable computer disk, a hard disk, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a portable compact disk read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the foregoing.

[0144] To provide interaction with a user, the systems and techniques described herein may be implemented on an electronic device having: a display device (e.g., a CRT (cathode ray tube) or LCD (liquid crystal display) monitor) for displaying information to the user; and a keyboard and a pointing device (e.g., a mouse or trackball) through which the user can provide input to the electronic device. Other types of devices may also be used to provide interaction with the user; for example, the feedback provided to the user may be any form of sensory feedback (e.g., visual feedback, auditory feedback, or tactile feedback); and input from the user may be received in any form (including acoustic input, voice input, or tactile input).

[0145] The systems and techniques described herein may be implemented in a computing system that includes backend components (e.g., as a data server), or a computing system that includes middleware components (e.g., an application server), or a computing system that includes frontend components (e.g., a user computer with a graphical user interface or a web browser through which a user can interact with implementations of the systems and techniques described herein), or a computing system that includes any combination of such backend components, middleware components, or frontend components. The components of the system may be interconnected by any form or medium of digital data communication (e.g., a communication network). Examples of communication networks include: a local area network (LAN), a wide area network (WAN), a blockchain network, and the Internet.

[0146] A computing system may include a client and a server. The client and the server are generally remote from each other and usually interact through a communication network. The client and server relationship is generated by computer programs running on the corresponding computers and having a client-server relationship with each other. The server may be a cloud server, also known as a cloud computing server or cloud host, which is a host product in the cloud computing service system to solve the defects of difficult management and weak business scalability in traditional physical hosts and VPS services.

[0147] It should be understood that the various forms of processes shown above can be used to reorder, add or delete steps. For example, the steps described in the present invention can be executed in parallel, sequentially or in different orders, as long as the desired results of the technical solution of the present invention can be achieved, and this document does not limit this.

[0148] The above specific implementations do not constitute a limitation on the protection scope of the present invention. It should be understood by those skilled in the art that various modifications, combinations, sub-combinations and substitutions can be made according to design requirements and other factors. Any modification, equivalent substitution and improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A method for determining the escape concentration of denitrification ammonia, characterized in that: Applied to a flue gas treatment system, the flue gas treatment equipment is provided with an economizer, a denitrifier, an air preheater, a dust collector, an induced draft fan and a desulfurizer in sequence; wherein two sets of online monitoring instruments are respectively provided at the inlet and outlet of the denitrifier, and a flow rate collection device is provided at the outlet of the dust collector; The method comprises: Obtaining flue gas treatment data of the target flue gas during denitration treatment, the flue gas treatment data at least including denitration inlet data, denitration outlet data and actual flue gas flow rate data, the denitration inlet data and the denitration outlet data are acquired by the online monitoring instrument, and the actual flue gas flow rate data is acquired by the flow rate acquisition device; Determining the denitration efficiency of nitrogen oxides in the target flue gas according to the denitration inlet data and the denitration outlet data; The ammonia escape concentration of the target flue gas after denitrification treatment is determined according to the flue gas treatment data, the chemical denitrification efficiency and a predetermined ammonia escape concentration function, wherein the ammonia escape concentration function is obtained according to an ammonia-nitrogen molar ratio function.

2. The method according to claim 1, characterized in that The process of determining the ammonia escape concentration function includes: Constructing a first ammonia-nitrogen molar ratio function according to an ammonia supply flow element, an ammonia molar mass element, a dry-basis flue gas flow element, a nitrogen oxide input concentration element, and a nitrogen dioxide molar mass element; Constructing a second ammonia-nitrogen molar ratio function according to the ammonia escape concentration element, the ammonia reaction concentration element, the ammonia molar mass element, the nitrogen oxide input concentration element and the nitrogen dioxide molar mass element; An ammonia escape concentration function is determined based on the first ammonia nitrogen molar ratio function and the second ammonia nitrogen molar ratio function.

3. The method according to claim 2, characterized in that The step of determining the ammonia escape concentration function according to the first ammonia nitrogen molar ratio function and the second ammonia nitrogen molar ratio function comprises: Transforming the first ammonia nitrogen molar ratio function to obtain a first transformed molar ratio function; Based on the denitrification reaction mechanism, the second ammonia nitrogen molar ratio function is transformed to obtain a second transformed molar ratio function; The first transformation molar ratio function and the second transformation molar ratio function are integrated to obtain an ammonia escape concentration function.

4. The method according to claim 1, characterized in that: The step of determining the ammonia escape concentration of the target flue gas after denitration treatment according to the flue gas treatment data, the chemical denitration efficiency and a predetermined ammonia escape concentration function comprises: Determining dry-base flue gas flow data according to the actual flue gas flow rate data in the flue gas processing data; The denitrification inlet data, the denitrification outlet data, the chemical denitrification efficiency and the dry-base flue gas flow data are input into the ammonia escape concentration function to determine the ammonia escape concentration of the target flue gas after denitrification treatment.

5. The method according to claim 4, characterized in that The step of determining the dry-basis flue gas flow rate data according to the actual flue gas flow rate data in the flue gas processing data comprises: Determine actual flue gas flow data according to the actual flue gas flow velocity data and the cross-sectional area of ​​the denitrification pipeline; Based on the ideal gas law, dry-basis flue gas flow data of the actual flue gas flow data under standard conditions is determined according to the actual flue gas flow data, and the actual flue gas temperature and the actual flue gas pressure corresponding to the actual flue gas flow data.

6. The method according to claim 5, characterized in that Before determining the dry-base flue gas flow data of the actual flue gas flow data under the standard state, the method further includes: Based on the ideal gas law, according to the actual flue gas flow data, the actual flue gas temperature and the actual flue gas pressure, determine the standard state flue gas flow data of the actual flue gas flow data under the standard state; According to the water volume in the standard state flue gas flow data, the dry-base flue gas flow data of the actual flue gas flow data under the standard state is determined.

7. The method according to claim 5 or 4, characterized in that: Before determining the dry-base flue gas flow data of the actual flue gas flow data under the standard state, the method further includes: Determine the flue gas leakage rate between the outlet of the denitrifier and the outlet of the dust collector, and determine the flue gas leakage flow data according to the flue gas leakage rate; The dry-base smoke flow data is determined according to the smoke leakage flow data and the actual smoke flow data.

8. A device for determining the concentration of denitrification ammonia escape, characterized in that: Applied to a flue gas treatment system, the flue gas treatment equipment is provided with an economizer, a denitrifier, an air preheater, a dust collector, an induced draft fan and a desulfurizer in sequence; wherein two sets of online monitoring instruments are respectively provided at the inlet and outlet of the denitrifier, and a flow rate collection device is provided at the outlet of the dust collector; The device comprises: A flue gas treatment data acquisition module, used to acquire flue gas treatment data of the target flue gas during denitration treatment, wherein the flue gas treatment data at least includes denitration inlet data, denitration outlet data and actual flue gas flow rate data, wherein the denitration inlet data and the denitration outlet data are acquired through the online monitoring instrument, and the actual flue gas flow rate data are acquired through the flow rate acquisition device; A chemical denitration efficiency determination module, used to determine the chemical denitration efficiency of nitrogen oxides in the target flue gas according to the denitration inlet data and the denitration outlet data; The ammonia escape concentration determination module is used to determine the ammonia escape concentration of the target flue gas after denitrification treatment according to the flue gas treatment data, the chemical denitrification efficiency and a predetermined ammonia escape concentration function, wherein the ammonia escape concentration function is obtained according to an ammonia-nitrogen molar ratio function.

9. An electronic device, characterized in that: The electronic device comprises: at least one processor; and a memory communicatively connected to the at least one processor; wherein, The memory stores a computer program executable by the at least one processor, and the computer program is executed by the at least one processor so that the at least one processor can execute the method for determining the denitrification ammonia escape concentration according to any one of claims 1 to 7.

10. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores computer instructions, and the computer instructions are used to enable a processor to implement the method for determining the denitrification ammonia escape concentration according to any one of claims 1 to 7 when executed.

Images