Ammonia amount control method and device

Abstract

The embodiment of the invention provides an ammonia amount control method and device. The method comprises the following steps: acquiring current boiler parameters of the coal boiler; collecting a nitrogen oxide parameter of a denitration inlet of the denitration system as a first nitrogen oxide parameter; collecting a nitrogen oxide parameter of a denitration outlet of the denitration system as a second nitrogen oxide parameter; collecting a nitrogen oxide parameter of a total exhaust port of the denitration system as a third nitrogen oxide parameter; according to at least one of the current boiler parameter, the first nitrogen oxide parameter, the second nitrogen oxide parameter and the third nitrogen oxide parameter, determining the current required ammonia amount of the denitration system; and spraying ammonia to the denitration system according to the current required ammonia amount. In this way, the ammonia spraying amount calculated by integrating different parameters is obviously more accurate, the ammonia spraying accuracy of the denitration system is improved, and the ammonia spraying automation, accuracy, reliability and robustness of the denitration system are achieved.

Description

Technical Field

[0001] The present disclosure relates to the field of industrial flue gas denitrification control, and in particular to the technical field of ammonia quantity control. Background Art

[0002] Currently, environmental protection requirements are becoming increasingly stringent, and the quality requirements for flue gas emitted by various factories such as power plants are also becoming increasingly higher. The concentration of toxic and harmful gases such as nitrogen oxides (NOx) in the flue gas emitted by coal-fired boilers and other industrial equipment must meet certain conditions before they can be discharged. Otherwise, it will affect air quality and cause environmental pollution. To reduce the concentration of these nitrogen oxides to a certain level, it is necessary to use ammonia injection in the denitrification system. Specifically, after nitrogen oxides and ammonia enter the denitrification system, they will produce nitrogen and water under the action of the catalyst in the denitrification system, thereby reducing the concentration of nitrogen oxides. However, if this ammonia injection process is completed manually, it will result in excessive or insufficient ammonia injection. Excessive ammonia injection will cause the air preheater of the power plant boiler to clog. If the ammonia injection is insufficient (not enough NOx is removed), the environmental data will not meet the standards. Therefore, automatic control is required with high precision, high reliability, and good robustness. Therefore, how to accurately control the amount of ammonia injection has become an urgent problem to be solved. Summary of the Invention

[0003] The present disclosure provides a method and device for controlling ammonia amount.

[0004] According to a first aspect of the present disclosure, a method for controlling ammonia content is provided. The method comprises:

[0005] Obtaining current boiler parameters of the coal boiler;

[0006] collecting a nitrogen oxide parameter at a denitration inlet of the denitration system as a first nitrogen oxide parameter;

[0007] collecting a nitrogen oxide parameter at a denitration outlet of the denitration system as a second nitrogen oxide parameter;

[0008] collecting a nitrogen oxide parameter from a total exhaust port of the denitration system as a third nitrogen oxide parameter;

[0009] determining a current amount of ammonia required by the denitration system according to at least one of the current boiler parameter, the first nitrogen oxide parameter, the second nitrogen oxide parameter, and the third nitrogen oxide parameter;

[0010] Ammonia is sprayed into the denitration system according to the currently required amount of ammonia.

[0011] According to the above aspect and any possible implementation, there is further provided an implementation, wherein determining the current amount of ammonia required by the denitration system based on at least one of the current boiler parameter, the first nitrogen oxide parameter, the second nitrogen oxide parameter, and the third nitrogen oxide parameter includes:

[0012] determining a corresponding first target ammonia amount according to the current boiler parameters;

[0013] calculating a second target ammonia amount according to the current boiler parameter, the first nitrogen oxide parameter, and the second nitrogen oxide parameter;

[0014] calculating a third target ammonia amount according to the current boiler parameter and the second nitrogen oxide parameter;

[0015] calculating a fourth target ammonia amount according to the first nitrogen oxide parameter, the second nitrogen oxide parameter, and the third nitrogen oxide parameter;

[0016] performing weighted summation on the first target ammonia amount, the second target ammonia amount, the third target ammonia amount, and the fourth target ammonia amount to obtain a sum of ammonia amounts;

[0017] comparing the sum of the ammonia amounts with a preset minimum ammonia amount;

[0018] If the sum of the ammonia amounts is greater than or equal to the preset minimum ammonia amount, the sum of the ammonia amounts is determined as the current ammonia amount required by the denitration system;

[0019] If the sum of the ammonia amounts is less than the preset minimum ammonia amount, the preset minimum ammonia amount is determined as the ammonia amount currently required by the denitration system.

[0020] According to the above aspect and any possible implementation, there is further provided an implementation, wherein determining the corresponding first target ammonia amount according to the current boiler parameter includes:

[0021] Get historical boiler parameters;

[0022] Calculating a boiler parameter difference between the current boiler parameter and the historical boiler parameter;

[0023] The first target ammonia amount is calculated according to the boiler parameter difference.

[0024] According to the above aspect and any possible implementation, further provided is an implementation, wherein the current boiler parameter includes a current furnace air volume of the boiler; and calculating the second target ammonia amount based on the current boiler parameter, the first nitrogen oxide parameter, and the second nitrogen oxide parameter includes:

[0025] Obtaining a nitrogen oxide set value at the total exhaust port and a nitrogen oxide set value at the denitration outlet;

[0026] Obtaining an actual ammonia injection amount of the denitrification system;

[0027] Determining the start and stop times of the coal mill;

[0028] The second target ammonia amount is calculated based on the current furnace air volume, the first nitrogen oxide parameter, the second nitrogen oxide parameter, the nitrogen oxide setting value of the total exhaust port, the nitrogen oxide setting value of the denitrification outlet, the actual ammonia injection amount and the start and stop time.

[0029] The above aspects and any possible implementation manner further provide an implementation manner, wherein the calculating the second target ammonia amount according to the current furnace air volume, the first nitrogen oxide parameter, the second nitrogen oxide parameter, the nitrogen oxide set value at the total exhaust port, the nitrogen oxide set value at the denitration outlet, the actual ammonia injection amount, and the start and stop times includes:

[0030] Calculating a first preset ammonia amount according to the first nitrogen oxide parameter, the nitrogen oxide set value at the denitration outlet, and the current furnace air volume;

[0031] Calculating a second preset ammonia amount according to the second nitrogen oxide parameter, the nitrogen oxide set value at the denitration outlet, and the current furnace air volume;

[0032] determining a third preset ammonia amount corresponding to the start / stop time;

[0033] Get the historical theoretical ammonia injection amount;

[0034] calculating a difference between the historical theoretical ammonia injection amount and the current actual ammonia injection amount as a fourth preset ammonia amount;

[0035] The first preset ammonia amount, the second preset ammonia amount, the third preset ammonia amount, and the fourth preset ammonia amount are weighted and summed to obtain the second target ammonia amount.

[0036] According to the above aspects and any possible implementation, an implementation is further provided, wherein the calculating the second preset ammonia amount according to the second nitrogen oxide parameter, the nitrogen oxide set value at the denitration outlet, and the current furnace air volume includes:

[0037] At every preset time period, determining whether the second nitrogen oxide parameter is greater than a set value of nitrogen oxides at a denitration outlet;

[0038] If the second nitrogen oxide parameter is greater than the nitrogen oxide set value at the denitration outlet and the second nitrogen oxide parameter continues to increase within a first preset time period, calculating the second preset ammonia amount according to the second nitrogen oxide parameter, the nitrogen oxide set value at the denitration outlet, and the current furnace air volume;

[0039] or

[0040] At every preset time period, determining whether the second nitrogen oxide parameter is less than a set value of nitrogen oxide at a denitration outlet;

[0041] If the second nitrogen oxide parameter is less than the nitrogen oxide setting value at the denitrification outlet and the second nitrogen oxide parameter continues to decrease within a second preset time period, the second preset ammonia amount is calculated based on the second nitrogen oxide parameter, the nitrogen oxide setting value at the denitrification outlet and the current furnace air volume.

[0042] According to the above aspect and any possible implementation, further provided is an implementation, wherein the current boiler parameter includes a current furnace air volume, and the calculating the third target ammonia amount based on the current boiler parameter and the second nitrogen oxide parameter includes:

[0043] Calculating the nitrogen oxide set value at the denitration outlet according to the second nitrogen oxide parameter, the third nitrogen oxide parameter, and the nitrogen oxide set value at the total exhaust outlet;

[0044] The third target ammonia amount is calculated according to the second nitrogen oxide parameter, the nitrogen oxide set value at the denitration outlet and the current furnace air volume.

[0045] According to the above aspect and any possible implementation, further provided is an implementation, wherein calculating a fourth target ammonia amount according to the first nitrogen oxide parameter, the second nitrogen oxide parameter, and the third nitrogen oxide parameter includes:

[0046] calculating a difference between the second nitrogen oxide parameter and a first preset nitrogen oxide parameter;

[0047] determining whether the difference is greater than a preset nitrogen oxide threshold;

[0048] If the second nitrogen oxide parameter continues to increase within a third preset time period and the difference is greater than the preset nitrogen oxide threshold, increasing a first preset designated ammonia amount;

[0049] The first preset designated ammonia amount is determined as the fourth target ammonia amount.

[0050] According to the above aspect and any possible implementation, further provided is an implementation, wherein calculating a fourth target ammonia amount according to the first nitrogen oxide parameter, the second nitrogen oxide parameter, and the third nitrogen oxide parameter includes:

[0051] collecting the current oxygen amount at the total exhaust port;

[0052] Determining whether the current oxygen level is normal;

[0053] If the current oxygen amount is normal, the total exhaust port of the denitration system is not back-blown, and the third nitrogen oxide parameter is higher than the second preset nitrogen oxide parameter, increasing the second preset designated ammonia amount;

[0054] The second preset designated ammonia amount is determined as the fourth target ammonia amount.

[0055] According to a second aspect of the present disclosure, an ammonia quantity control device is provided. The device is applicable to a denitration system, wherein a coal boiler is connected upstream of the denitration system, the coal boiler is used to burn pulverized coal to generate flue gas, and the flue gas is passed into the denitration system, and the denitration system is used to denitrate the flue gas. A coal mill is connected upstream of the coal boiler, the coal mill is used to grind coal into pulverized coal, and the pulverized coal is supplied to the coal boiler. The device comprises:

[0056] An acquisition module, configured to acquire current boiler parameters of the coal boiler;

[0057] a first collecting module, configured to collect a nitrogen oxide parameter at a denitration inlet of the denitration system as a first nitrogen oxide parameter;

[0058] a second collecting module, configured to collect a nitrogen oxide parameter at a denitration outlet of the denitration system as a second nitrogen oxide parameter;

[0059] a third collecting module, configured to collect a nitrogen oxide parameter from a total exhaust port of the denitration system as a third nitrogen oxide parameter;

[0060] a determination module, configured to determine a current amount of ammonia required by the denitration system based on at least one of the current boiler parameter, the first nitrogen oxide parameter, the second nitrogen oxide parameter, and the third nitrogen oxide parameter;

[0061] The ammonia injection module is used to inject ammonia into the denitration system according to the currently required amount of ammonia.

[0062] According to a third aspect of the present disclosure, an electronic device is provided, comprising: a memory and a processor, wherein a computer program is stored in the memory, and the processor implements the above method when executing the program.

[0063] According to a fourth aspect of the present disclosure, a computer-readable storage medium is provided, on which a computer program is stored. When the program is executed by a processor, the method according to the first aspect of the present disclosure is implemented.

[0064] In the present disclosure, by obtaining the current boiler parameters of the coal boiler, the first nitrogen oxide parameter, the second nitrogen oxide parameter and the third nitrogen oxide parameter of the denitrification system, at least one of these parameters can be used for reasonable calculation, so that the current required ammonia amount of the denitrification system can be accurately calculated by integrating multiple different parameters of the denitrification system and the equipment associated with the denitrification system, and then ammonia is automatically sprayed into the denitrification system according to the current required ammonia amount. In this way, the need for manual calculation of the ammonia injection amount can be avoided, and the ammonia injection amount calculated by integrating different parameters is obviously more accurate, thereby improving the accuracy of ammonia injection of the denitrification system and realizing the automation, precision, reliability and robustness of ammonia injection of the denitrification system.

[0065] It should be understood that the contents described in the Summary of the Invention section are not intended to limit the key or important features of the embodiments of the present disclosure, nor are they intended to limit the scope of the present disclosure. Other features of the present disclosure will become readily understood through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0066] The above and other features, advantages and aspects of the embodiments of the present disclosure will become more apparent with reference to the following detailed description in conjunction with the accompanying drawings. The accompanying drawings are provided for a better understanding of the present disclosure and do not constitute a limitation of the present disclosure. In the accompanying drawings, the same or similar reference numerals represent the same or similar elements, among which:

[0067] Figure 1 A schematic diagram showing the connection relationship of a denitration system according to an embodiment of the present disclosure is shown;

[0068] Figure 2 A flow chart of an ammonia amount control method according to an embodiment of the present disclosure is shown;

[0069] Figure 3 A block diagram of an ammonia quantity control device according to an embodiment of the present disclosure is shown;

[0070] Figure 4 A block diagram of an exemplary electronic device capable of implementing embodiments of the present disclosure is shown. DETAILED DESCRIPTION

[0071] To make the purpose, technical solutions, and advantages of the embodiments of the present disclosure more clear, the technical solutions in the embodiments of the present disclosure will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present disclosure, not all of the embodiments. Based on the embodiments of the present disclosure, all other embodiments obtained by ordinary technicians in this field without making any creative efforts are within the scope of protection of the present disclosure.

[0072] In this document, the term "and / or" simply describes a relationship between related objects, indicating that three possible relationships exist. For example, "A and / or B" can represent: A exists alone, A and B exist simultaneously, or B exists alone. Furthermore, the character " / " in this document generally indicates that the related objects are in an "or" relationship.

[0073] Figure 2 The flow chart of the ammonia control method 200 according to the embodiment of the present disclosure is shown. The method 200 is applicable to a denitrification system. The function of the denitrification system is: after ammonia is injected, nitrogen oxides are fully mixed with ammonia and then nitrogen and water are generated under the action of a catalyst. The connection relationship is as follows: Figure 1 As shown, a coal boiler is connected upstream of the denitration system, the coal boiler is used to burn pulverized coal to generate flue gas and pass the flue gas into the denitration system, the denitration system is used to denitrate the flue gas, a coal mill is connected upstream of the coal boiler, the coal mill is used to grind coal blocks into pulverized coal and provide the pulverized coal to the coal boiler, and the method further includes:

[0074] Step 210, obtaining current boiler parameters of the coal boiler;

[0075] The current boiler parameters include but are not limited to the oxygen amount of the coal boiler, the air volume of the coal boiler, the coal feed amount of the coal boiler, the start and stop of the coal mill, etc.

[0076] Step 220: collecting the nitrogen oxide parameter (such as NOx concentration) at the denitration inlet of the denitration system as the first nitrogen oxide parameter; Figure 1 As shown, the denitrification inlet is the inlet of the catalyst layer in the denitrification system, which is used to supply the flue gas and the injected ammonia to the catalyst layer so that the nitrogen oxides and ammonia in the flue gas react under the action of the catalyst; the denitrification outlet is the outlet of the catalyst layer in the denitrification system, which is used to discharge the reacted gas, liquid and unreacted residual nitrogen oxides or ammonia. The total exhaust port is equivalent to the chimney outlet of the denitrification system, which is used to supply the final discharge of the gas in the denitrification system.

[0077] Step 230: collecting a nitrogen oxide parameter at a denitration outlet of the denitration system as a second nitrogen oxide parameter;

[0078] Step 240: collecting a nitrogen oxide parameter at the total exhaust port of the denitration system as a third nitrogen oxide parameter;

[0079] Step 250: determining a current ammonia amount (e.g., ammonia concentration or mass) required by the denitration system based on at least one of the current boiler parameter, the first nitrogen oxide parameter, the second nitrogen oxide parameter, and the third nitrogen oxide parameter;

[0080] Step 260: spray ammonia into the denitrification system according to the currently required amount of ammonia.

[0081] By obtaining the current boiler parameters of the coal boiler, the first nitrogen oxide parameter, the second nitrogen oxide parameter and the third nitrogen oxide parameter of the denitrification system, at least one of these parameters can be used for reasonable calculations, so that the current required ammonia amount of the denitrification system can be accurately calculated by combining multiple different parameters of the denitrification system and equipment associated with the denitrification system, and then ammonia is automatically sprayed into the denitrification system according to the current required ammonia amount. In this way, the need for manual calculation of the ammonia injection amount can be avoided, and the ammonia injection amount calculated by combining different parameters is obviously more accurate, thereby improving the accuracy of ammonia injection of the denitrification system and realizing the automation, precision, reliability and robustness of ammonia injection of the denitrification system.

[0082] In some embodiments, determining the current amount of ammonia required by the denitration system based on at least one of the current boiler parameter, the first nitrogen oxide parameter, the second nitrogen oxide parameter, and the third nitrogen oxide parameter includes:

[0083] determining a corresponding first target ammonia amount according to the current boiler parameters;

[0084] calculating a second target ammonia amount according to the current boiler parameter, the first nitrogen oxide parameter, and the second nitrogen oxide parameter;

[0085] calculating a third target ammonia amount according to the current boiler parameter and the second nitrogen oxide parameter;

[0086] calculating a fourth target ammonia amount according to the first nitrogen oxide parameter, the second nitrogen oxide parameter, and the third nitrogen oxide parameter;

[0087] performing weighted summation on the first target ammonia amount, the second target ammonia amount, the third target ammonia amount, and the fourth target ammonia amount to obtain a sum of ammonia amounts;

[0088] comparing the sum of the ammonia amounts with a preset minimum ammonia amount;

[0089] If the sum of the ammonia amounts is greater than or equal to the preset minimum ammonia amount, the sum of the ammonia amounts is determined as the current ammonia amount required by the denitration system;

[0090] If the sum of the ammonia amounts is less than the preset minimum ammonia amount, the preset minimum ammonia amount is determined as the ammonia amount currently required by the denitration system.

[0091] After calculating the first target ammonia amount, the second target ammonia amount, the third target ammonia amount and the fourth target ammonia amount, the first target ammonia amount, the second target ammonia amount, the third target ammonia amount and the fourth target ammonia amount can be automatically weighted and summed to obtain the sum of the ammonia amounts, and then the sum of the ammonia amounts is compared with the preset minimum ammonia amount. If the sum of the ammonia amounts is greater than or equal to the preset minimum ammonia amount, it means that the sum of the ammonia amounts is appropriate, and the sum of the ammonia amounts is determined as the current ammonia amount required for the denitrification system. If the sum of the ammonia amounts is less than the preset minimum ammonia amount, it means that it is not appropriate to use the sum of the ammonia amounts as the current required ammonia amount, which may result in insufficient ammonia injection into the denitrification system and substandard environmental protection data. Therefore, the preset minimum ammonia amount can be automatically determined as the current ammonia amount required for the denitrification system. In this way, it can be ensured that the ammonia injection amount of the denitrification system is sufficient and appropriate.

[0092] In some embodiments, determining the corresponding first target ammonia amount according to the current boiler parameters includes:

[0093] Obtain historical boiler parameters; the historical boiler parameters may be boiler parameters at a certain historical moment or average values ​​of boiler parameters over a certain historical time period.

[0094] Calculating a boiler parameter difference between the current boiler parameter and the historical boiler parameter;

[0095] The first target ammonia amount is calculated according to the boiler parameter difference.

[0096] By calculating the boiler parameter difference between the current boiler parameter and the historical boiler parameter, the first target ammonia amount can be automatically calculated based on the boiler parameter difference, thereby accurately calculating the first target ammonia amount according to the change in the boiler parameter.

[0097] For example: when the coal feed rate of a coal boiler drops by more than 9 kg compared to the previous 20 seconds, the amount of ammonia is increased by 20 kg within 10 seconds, and after 10 seconds, the amount of ammonia is reduced by 0.1 kg per second until it drops to 0.

[0098] formula:

[0099] If the coal supply decreases and is lower than the data 20 seconds ago by more than 9,

[0100] The delay increases the amount of ammonia by 20kg for 10 seconds, and then decreases the amount of ammonia by 0.1kg per second until it reaches 0.

[0101] In some embodiments, the current boiler parameter includes a current furnace air volume of the boiler; and calculating the second target ammonia amount based on the current boiler parameter, the first nitrogen oxide parameter, and the second nitrogen oxide parameter includes:

[0102] Obtaining a nitrogen oxide set value at the total exhaust port and a nitrogen oxide set value at the denitration outlet;

[0103] Obtaining an actual ammonia injection amount of the denitrification system;

[0104] Determining the start and stop times of the coal mill;

[0105] The second target ammonia amount is calculated based on the current furnace air volume, the first nitrogen oxide parameter, the second nitrogen oxide parameter, the nitrogen oxide setting value of the total exhaust port, the nitrogen oxide setting value of the denitrification outlet, the actual ammonia injection amount and the start and stop time.

[0106] By obtaining the nitrogen oxide set value of the total exhaust port, the nitrogen oxide set value of the denitrification outlet, the actual ammonia injection amount of the denitrification system and the start and stop time of the pulverizer, these data and the current furnace air volume, the first nitrogen oxide parameter and the second nitrogen oxide parameter can be combined to accurately calculate the second target ammonia amount to improve the accuracy of the second target ammonia amount.

[0107] In some embodiments, the calculating the second target ammonia amount according to the current furnace air volume, the first nitrogen oxide parameter, the second nitrogen oxide parameter, the nitrogen oxide set value of the total exhaust port, the nitrogen oxide set value of the denitrification outlet, the actual ammonia injection amount, and the start and stop time includes:

[0108] Calculating a first preset ammonia amount according to the first nitrogen oxide parameter, the nitrogen oxide set value at the denitration outlet, and the current furnace air volume;

[0109] For example: the first preset ammonia amount (mass of ammonia) = (inlet NOx concentration - outlet NOx concentration setting value) * total furnace air volume * conversion coefficient. The conversion coefficient is the conversion coefficient between the concentration of nitrogen oxides NOx and the mass of ammonia, which is used to characterize the relationship between the concentration of nitrogen oxides and the mass of ammonia. The conversion coefficient = (17 / 46) / 0.283 / 1000 / 1.293.

[0110] Calculating a second preset ammonia amount according to the second nitrogen oxide parameter, the nitrogen oxide set value at the denitration outlet, and the current furnace air volume;

[0111] Second preset ammonia amount = ∑ (outlet NOx concentration - outlet NOx concentration setting value) × total furnace air volume × (17 ÷ 46) ÷ 0.283 ÷ 1000 ÷ 1.293. The second preset ammonia amount is accumulated every preset time period. This outlet is the denitrification outlet.

[0112] determining a third preset ammonia amount corresponding to the start / stop time;

[0113] When the coal mill starts, coal will be added to the coal boiler, and the concentration of nitrogen oxides will increase. Therefore, it is necessary to delay 2 minutes after the coal mill is started to add the third preset ammonia amount to the denitrification system; and when the coal mill stops, there is no coal in the coal mill, and there is very little coal in the coal boiler, but the air volume in the coal boiler is temporarily large, resulting in uneven mixing of coal and air. Therefore, the concentration of nitrogen oxides will also increase. Therefore, it is necessary to delay 2 minutes after the coal mill stops to add the third preset ammonia amount to the denitrification system.

[0114] Get the historical theoretical ammonia injection amount;

[0115] calculating a difference between the historical theoretical ammonia injection amount and the current actual ammonia injection amount as a fourth preset ammonia amount;

[0116] The historical theoretical ammonia injection amount may be a theoretical ammonia injection amount in a process of manually estimating the ammonia injection amount (ie, not automatically calculating the ammonia injection amount).

[0117] Using the difference between the historical theoretical ammonia injection amount and the current actual ammonia injection amount as the fourth preset ammonia amount can ensure that the theoretical ammonia injection amount tracks the actual ammonia injection amount, and ensure that the calculated theoretical ammonia injection amount can track the actual required ammonia amount in real time, that is, ensure that the theoretical ammonia injection amount can meet the actual ammonia required.

[0118] The first preset ammonia amount, the second preset ammonia amount, the third preset ammonia amount, and the fourth preset ammonia amount are weighted and summed to obtain the second target ammonia amount.

[0119] By combining different parameters to calculate the first preset ammonia amount, the second preset ammonia amount, the third preset ammonia amount and the fourth preset ammonia amount respectively, these four parts of ammonia amount can be automatically weighted and summed to obtain an accurate second target ammonia amount.

[0120] In some embodiments, the calculating the second preset ammonia amount according to the second nitrogen oxide parameter, the nitrogen oxide set value at the denitration outlet, and the current furnace air volume includes:

[0121] At every preset time period, determining whether the second nitrogen oxide parameter is greater than a set value of nitrogen oxides at a denitration outlet;

[0122] If the second nitrogen oxide parameter is greater than the nitrogen oxide setting value at the denitrification outlet and the second nitrogen oxide parameter continues to increase within the first preset time period, the second preset ammonia amount is calculated based on the second nitrogen oxide parameter, the nitrogen oxide setting value at the denitrification outlet and the current furnace air volume.

[0123] At every preset time period, if the second nitrogen oxide parameter is greater than the nitrogen oxide set value at the denitrification outlet and continues to increase, it means that the nitrogen oxide parameter at the denitrification outlet is too high and has not yet reached the environmental protection standard, and the amount of ammonia sprayed is too small. Therefore, the nitrogen oxide set value at the denitrification outlet and the current furnace air volume can be combined to accurately calculate the second preset ammonia amount, so that the nitrogen oxide parameter requirements at the denitrification outlet are fully considered when spraying ammonia.

[0124] or

[0125] In some embodiments, the calculating the second preset ammonia amount according to the second nitrogen oxide parameter, the nitrogen oxide set value at the denitration outlet, and the current furnace air volume includes:

[0126] At every preset time period, determining whether the second nitrogen oxide parameter is less than a set value of nitrogen oxide at a denitration outlet;

[0127] If the second nitrogen oxide parameter is less than the nitrogen oxide setting value at the denitrification outlet and the second nitrogen oxide parameter continues to decrease within a second preset time period, the second preset ammonia amount is calculated based on the second nitrogen oxide parameter, the nitrogen oxide setting value at the denitrification outlet and the current furnace air volume.

[0128] At every preset time period, if the second nitrogen oxide parameter is less than the nitrogen oxide set value at the denitrification outlet and continues to decrease, it means that the nitrogen oxide parameter at the denitrification outlet is too low and the amount of ammonia sprayed is too much, and too much ammonia sprayed may cause the boiler air preheater to be blocked. Therefore, the second nitrogen oxide parameter, the nitrogen oxide set value at the denitrification outlet and the current furnace air volume can be combined to accurately calculate the second preset ammonia amount, so that the nitrogen oxide parameter requirements at the denitrification outlet can be fully considered when spraying ammonia.

[0129] In some embodiments, the current boiler parameter includes a current furnace air volume, and calculating the third target ammonia amount based on the current boiler parameter and the second nitrogen oxide parameter includes:

[0130] Calculating the nitrogen oxide set value at the denitration outlet according to the second nitrogen oxide parameter, the third nitrogen oxide parameter, and the nitrogen oxide set value at the total exhaust outlet;

[0131] The third target ammonia amount is calculated based on the second nitrogen oxide parameter, the nitrogen oxide set value of the denitrification outlet and the current furnace air volume. The denitrification outlet of the denitrification system may include multiple, such as Figure 2 The figure includes A denitrification outlet and B denitrification outlet.

[0132] Based on the second nitrogen oxide parameter, the third nitrogen oxide parameter and the nitrogen oxide set value of the total exhaust port, the nitrogen oxide set value of the denitrification outlet can be accurately calculated, and then based on the second nitrogen oxide parameter, the nitrogen oxide set value of the denitrification outlet and the current furnace air volume, the third target ammonia amount can be accurately calculated.

[0133] The nitrogen oxide setting value at the denitrification outlet = ((A the average NOx concentration at the denitrification outlet in the recent period - the average NOx concentration at the total exhaust outlet in the recent period + the nitrogen oxide setting value at the total exhaust outlet) + (B the average NOx concentration at the denitrification outlet in the recent period - the average NOx concentration at the total exhaust outlet in the recent period + the nitrogen oxide setting value at the total exhaust outlet)) / 2.

[0134] The NOx concentration at the A / B denitrification outlet in the recent period is the second nitrogen oxide parameter; the nitrogen oxide set value at the total exhaust outlet is the nitrogen oxide set value at the total exhaust outlet.

[0135] Third target ammonia amount = (denitrification outlet NOx concentration - denitrification outlet NOx concentration set value) * total furnace air volume * conversion factor. Conversion factor = (17 ÷ 46) ÷ 0.283 ÷ 1000 ÷ 1.293.

[0136] In some embodiments, calculating a fourth target ammonia amount based on the first nitrogen oxide parameter, the second nitrogen oxide parameter, and the third nitrogen oxide parameter includes:

[0137] calculating a difference between the second nitrogen oxide parameter and a first preset nitrogen oxide parameter;

[0138] determining whether the difference is greater than a preset nitrogen oxide threshold;

[0139] If the second nitrogen oxide parameter continues to increase within a third preset time period and the difference is greater than the preset nitrogen oxide threshold, increasing a first preset designated ammonia amount;

[0140] The first preset designated ammonia amount is determined as the fourth target ammonia amount.

[0141] If the second nitrogen oxide parameter continues to increase within the third preset time period and the difference is greater than the preset nitrogen oxide threshold, it means that the nitrogen oxide concentration at the denitrification outlet continues to increase and is always greater than the set value. Therefore, the ammonia amount needs to be increased to reduce the concentration of nitrogen oxides. Therefore, the first preset specified ammonia amount can be increased, and the first preset specified ammonia amount can be automatically determined as the fourth target ammonia amount.

[0142] In some embodiments, calculating a fourth target ammonia amount based on the first nitrogen oxide parameter, the second nitrogen oxide parameter, and the third nitrogen oxide parameter includes:

[0143] collecting the current oxygen amount at the total exhaust port;

[0144] Determining whether the current oxygen level is normal;

[0145] If the current oxygen amount is normal, the total exhaust port of the denitration system is not back-blown, and the third nitrogen oxide parameter is higher than the second preset nitrogen oxide parameter, increasing the second preset designated ammonia amount;

[0146] Under normal circumstances, the residual gas in the main exhaust port needs to be sucked out and disposed of, but in order to avoid clogging of the main exhaust port, it is necessary to back-blow the main exhaust port regularly; in addition, the gas discharged from the main exhaust port contains some oxygen. When the denitrification system is working normally, the oxygen in the main exhaust port is also normal. Therefore, in order to ensure the accuracy of the ammonia amount, it is necessary to determine the ammonia amount when the main exhaust port is not back-blown and the current oxygen amount is normal. Specifically, if the third nitrogen oxide parameter is higher than the second preset nitrogen oxide parameter at this time, it means that the nitrogen oxide concentration at the main exhaust port of the denitrification system is too high. Therefore, it is necessary to increase the second preset designated ammonia amount, and automatically determine the second preset designated ammonia amount as the fourth target ammonia amount.

[0147] It should be noted that for the aforementioned method embodiments, for simplicity of description, they are all expressed as a series of action combinations, but those skilled in the art should be aware that the present disclosure is not limited by the order of the actions described, because according to the present disclosure, certain steps can be performed in other orders or simultaneously. Secondly, those skilled in the art should also be aware that the embodiments described in the specification are all optional embodiments, and the actions and modules involved are not necessarily required by the present disclosure.

[0148] The above is an introduction to the method embodiment. The following is a further explanation of the solution disclosed in the present disclosure through an apparatus embodiment.

[0149] Figure 3 FIG. 1 shows a block diagram of an ammonia quantity control device 300 according to an embodiment of the present disclosure. Figure 3 As shown, the apparatus 300 includes:

[0150] An acquisition module 310 is configured to acquire current boiler parameters of the coal boiler;

[0151] A first collecting module 320 is used to collect a nitrogen oxide parameter at a denitration inlet of the denitration system as a first nitrogen oxide parameter;

[0152] A second collection module 330 is used to collect the nitrogen oxide parameter at the denitration outlet of the denitration system as a second nitrogen oxide parameter;

[0153] a third collecting module 340 for collecting nitrogen oxide parameters at the total exhaust port of the denitration system as a third nitrogen oxide parameter;

[0154] a determination module 350 for determining a current ammonia amount required by the denitration system based on at least one of the current boiler parameter, the first nitrogen oxide parameter, the second nitrogen oxide parameter, and the third nitrogen oxide parameter;

[0155] The ammonia injection module 360 ​​is used to inject ammonia into the denitration system according to the currently required amount of ammonia.

[0156] Those skilled in the art can clearly understand that, for the convenience and brevity of description, the specific working process of the described module can refer to the corresponding process in the aforementioned method embodiment, and will not be repeated here.

[0157] According to an embodiment of the present disclosure, the present disclosure also provides an electronic device and a non-transitory computer-readable storage medium storing computer instructions.

[0158] Figure 4 A schematic block diagram of an electronic device 800 that can be used to implement an embodiment of the present disclosure 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 assistants, cellular phones, smartphones, wearable devices, 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 disclosure described and / or claimed herein.

[0159] The device 800 includes a computing unit 801 that can perform various appropriate actions and processes according to a computer program stored in a read-only memory (ROM) 802 or a computer program loaded from a storage unit 808 into a random access memory (RAM) 803. Various programs and data required for the operation of the device 800 can also be stored in the RAM 803. The computing unit 801, the ROM 802, and the RAM 803 are connected to each other via a bus 804. An input / output (I / O) interface 805 is also connected to the bus 804.

[0160] Various components in device 800 are connected to I / O interface 805, including an input unit 806, such as a keyboard, mouse, etc.; an output unit 807, such as various types of displays, speakers, etc.; a storage unit 808, such as a magnetic disk, optical disk, etc.; and a communication unit 809, such as a network card, modem, wireless communication transceiver, etc. The communication unit 809 allows device 800 to exchange information / data with other devices via a computer network such as the Internet and / or various telecommunication networks.

[0161] The computing unit 801 can be a variety of general-purpose and / or specialized processing components with processing and computing capabilities. Some examples of the computing unit 801 include, but are not limited to, a central processing unit (CPU), a graphics processing unit (GPU), various dedicated artificial intelligence (AI) computing chips, various computing units that run machine learning model algorithms, a digital signal processor (DSP), and any appropriate processor, controller, microcontroller, etc. The computing unit 801 performs the various methods and processes described above, such as method 100. For example, in some embodiments, method 100 can be implemented as a computer software program that is tangibly contained in a machine-readable medium, such as a storage unit 808. In some embodiments, part or all of the computer program can be loaded and / or installed on the device 800 via ROM 802 and / or communication unit 809. When the computer program is loaded into RAM 803 and executed by the computing unit 801, one or more steps of the method 100 described above can be performed. Alternatively, in other embodiments, the computing unit 801 can be configured to perform method 100 in any other appropriate manner (e.g., by means of firmware).

[0162] Various embodiments of the systems and techniques described 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), system-on-chip systems (SOCs), programmable logic devices (CPLDs), computer hardware, firmware, software, and / or combinations thereof. These various embodiments can include being implemented in one or more computer programs that are executable and / or interpreted on a programmable system that includes 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.

[0163] The program code for implementing the method of the present disclosure can be written in any combination of one or more programming languages. These program codes can be provided to a processor or controller of a general-purpose computer, a special-purpose computer, or other programmable data processing device so that when the program code is executed by the processor or controller, the functions / operations specified in the flow chart and / or block diagram are implemented. The program code can be executed entirely on the machine, partially on the machine, as a stand-alone software package, partially on the machine and partially on a remote machine, or entirely on a remote machine or server.

[0164] In the context of the present disclosure, a machine-readable medium can be a tangible medium that can contain or store a program for use by or in conjunction with an instruction execution system, device or equipment. A machine-readable medium can be a machine-readable signal medium or a machine-readable storage medium. A machine-readable medium can include, but is not limited to, an electronic, magnetic, optical, electromagnetic, infrared, or semiconductor system, device or equipment, or any suitable combination of the foregoing. A more specific example of a machine-readable storage medium can 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.

[0165] To provide interaction with a user, the systems and techniques described herein can be implemented on a computer 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 pointing device (e.g., a mouse or trackball) through which the user can provide input to the computer. Other types of devices can also be used to provide interaction with the user; for example, the feedback provided to the user can be any form of sensory feedback (e.g., visual feedback, auditory feedback, or tactile feedback); and input from the user can be received in any form (including acoustic input, voice input, or tactile input).

[0166] The systems and techniques described herein can be implemented in a computing system that includes back-end 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 front-end components (e.g., a user computer having 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 back-end components, middleware components, or front-end components. The components of the system can 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), and the Internet.

[0167] A computing system may include clients and servers. The client and server are generally remote from each other and typically interact via a communication network. This client-server relationship arises through computer programs running on the respective computers and forming a client-server relationship with each other. The server may be a cloud server, a server in a distributed system, or a server integrated with a blockchain.

[0168] It should be understood that the various forms of the processes shown above can be used to reorder, add, or delete steps. For example, the steps described in this disclosure can be performed in parallel, sequentially, or in a different order, as long as the desired results of the technical solutions disclosed in this disclosure can be achieved. This is not a limitation herein.

[0169] The above specific embodiments do not constitute a limitation on the scope of protection of this disclosure. Those skilled in the art will appreciate that various modifications, combinations, sub-combinations, and substitutions may be made based on design requirements and other factors. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this disclosure shall be included within the scope of protection of this disclosure.

Claims

1. A method for controlling the amount of ammonia, characterized in that: The method is applicable to a denitration system, wherein a coal boiler is connected upstream of the denitration system, the coal boiler is used to burn pulverized coal to generate flue gas and pass the flue gas into the denitration system, the denitration system is used to denitrate the flue gas, and a coal mill is connected upstream of the coal boiler, the coal mill is used to grind coal blocks into pulverized coal and provide the pulverized coal to the coal boiler. The method further comprises: Obtaining current boiler parameters of the coal boiler; collecting a nitrogen oxide parameter at a denitration inlet of the denitration system as a first nitrogen oxide parameter; collecting a nitrogen oxide parameter at a denitration outlet of the denitration system as a second nitrogen oxide parameter; collecting a nitrogen oxide parameter from a total exhaust port of the denitration system as a third nitrogen oxide parameter; determining a current amount of ammonia required by the denitration system according to at least one of the current boiler parameter, the first nitrogen oxide parameter, the second nitrogen oxide parameter, and the third nitrogen oxide parameter; Ammonia is sprayed into the denitration system according to the currently required amount of ammonia.

2. The method according to claim 1, wherein The determining, based on at least one of the current boiler parameter, the first nitrogen oxide parameter, the second nitrogen oxide parameter, and the third nitrogen oxide parameter, of the current amount of ammonia required by the denitration system includes: determining a corresponding first target ammonia amount according to the current boiler parameters; calculating a second target ammonia amount according to the current boiler parameter, the first nitrogen oxide parameter, and the second nitrogen oxide parameter; calculating a third target ammonia amount according to the current boiler parameter and the second nitrogen oxide parameter; calculating a fourth target ammonia amount according to the first nitrogen oxide parameter, the second nitrogen oxide parameter, and the third nitrogen oxide parameter; performing weighted summation on the first target ammonia amount, the second target ammonia amount, the third target ammonia amount, and the fourth target ammonia amount to obtain a sum of ammonia amounts; comparing the sum of the ammonia amounts with a preset minimum ammonia amount; If the sum of the ammonia amounts is greater than or equal to the preset minimum ammonia amount, the sum of the ammonia amounts is determined as the current ammonia amount required by the denitration system; If the sum of the ammonia amounts is less than the preset minimum ammonia amount, the preset minimum ammonia amount is determined as the ammonia amount currently required by the denitration system.

3. The method according to claim 2, wherein The determining, according to the current boiler parameters, a corresponding first target ammonia amount includes: Get historical boiler parameters; Calculating a boiler parameter difference between the current boiler parameter and the historical boiler parameter; The first target ammonia amount is calculated according to the boiler parameter difference.

4. The method according to claim 2, wherein The current boiler parameters include the current furnace air volume of the boiler; The calculating the second target ammonia amount according to the current boiler parameter, the first nitrogen oxide parameter, and the second nitrogen oxide parameter includes: Obtaining a nitrogen oxide set value at the total exhaust port and a nitrogen oxide set value at the denitration outlet; Obtaining an actual ammonia injection amount of the denitrification system; Determining the start and stop times of the coal mill; The second target ammonia amount is calculated based on the current furnace air volume, the first nitrogen oxide parameter, the second nitrogen oxide parameter, the nitrogen oxide setting value of the total exhaust port, the nitrogen oxide setting value of the denitrification outlet, the actual ammonia injection amount and the start and stop time.

5. The method according to claim 4, wherein The calculating the second target ammonia amount according to the current furnace air volume, the first nitrogen oxide parameter, the second nitrogen oxide parameter, the nitrogen oxide set value at the total exhaust port, the nitrogen oxide set value at the denitration outlet, the actual ammonia injection amount, and the start and stop times includes: Calculating a first preset ammonia amount according to the first nitrogen oxide parameter, the nitrogen oxide set value at the denitration outlet, and the current furnace air volume; Calculating a second preset ammonia amount according to the second nitrogen oxide parameter, the nitrogen oxide set value at the denitration outlet, and the current furnace air volume; determining a third preset ammonia amount corresponding to the start / stop time; Get the historical theoretical ammonia injection amount; calculating a difference between the historical theoretical ammonia injection amount and the current actual ammonia injection amount as a fourth preset ammonia amount; The first preset ammonia amount, the second preset ammonia amount, the third preset ammonia amount, and the fourth preset ammonia amount are weighted and summed to obtain the second target ammonia amount.

6. The method according to claim 5, wherein The calculating the second preset ammonia amount according to the second nitrogen oxide parameter, the nitrogen oxide set value at the denitration outlet, and the current furnace air volume includes: At every preset time period, determining whether the second nitrogen oxide parameter is greater than a set value of nitrogen oxides at a denitration outlet; If the second nitrogen oxide parameter is greater than the nitrogen oxide set value at the denitration outlet and the second nitrogen oxide parameter continues to increase within a first preset time period, calculating the second preset ammonia amount according to the second nitrogen oxide parameter, the nitrogen oxide set value at the denitration outlet, and the current furnace air volume; or At every preset time period, determining whether the second nitrogen oxide parameter is less than a set value of nitrogen oxide at a denitration outlet; If the second nitrogen oxide parameter is less than the nitrogen oxide setting value at the denitrification outlet and the second nitrogen oxide parameter continues to decrease within a second preset time period, the second preset ammonia amount is calculated based on the second nitrogen oxide parameter, the nitrogen oxide setting value at the denitrification outlet and the current furnace air volume.

7. The method according to claim 2, wherein The current boiler parameter includes a current furnace air volume, and calculating the third target ammonia amount according to the current boiler parameter and the second nitrogen oxide parameter includes: Calculating the nitrogen oxide set value at the denitration outlet according to the second nitrogen oxide parameter, the third nitrogen oxide parameter, and the nitrogen oxide set value at the total exhaust outlet; The third target ammonia amount is calculated according to the second nitrogen oxide parameter, the nitrogen oxide set value at the denitration outlet and the current furnace air volume.

8. The method according to claim 2, wherein The calculating a fourth target ammonia amount according to the first nitrogen oxide parameter, the second nitrogen oxide parameter, and the third nitrogen oxide parameter includes: calculating a difference between the second nitrogen oxide parameter and a first preset nitrogen oxide parameter; determining whether the difference is greater than a preset nitrogen oxide threshold; If the second nitrogen oxide parameter continues to increase within a third preset time period and the difference is greater than the preset nitrogen oxide threshold, increasing a first preset designated ammonia amount; The first preset designated ammonia amount is determined as the fourth target ammonia amount.

9. The method according to claim 2, wherein The calculating a fourth target ammonia amount according to the first nitrogen oxide parameter, the second nitrogen oxide parameter, and the third nitrogen oxide parameter includes: collecting the current oxygen amount at the total exhaust port; Determining whether the current oxygen level is normal; If the current oxygen amount is normal, the total exhaust port of the denitration system is not back-blown, and the third nitrogen oxide parameter is higher than the second preset nitrogen oxide parameter, increasing the second preset designated ammonia amount; The second preset designated ammonia amount is determined as the fourth target ammonia amount.

10. An ammonia quantity control device, characterized in that: The device is suitable for a denitration system. A coal boiler is connected upstream of the denitration system. The coal boiler is used to burn coal powder to generate flue gas and pass the flue gas into the denitration system. The denitration system is used to denitrate the flue gas. A coal mill is connected upstream of the coal boiler. The coal mill is used to grind coal blocks into coal powder and provide the coal powder to the coal boiler. The device includes: An acquisition module, configured to acquire current boiler parameters of the coal boiler; a first collecting module, configured to collect a nitrogen oxide parameter at a denitration inlet of the denitration system as a first nitrogen oxide parameter; a second collecting module, configured to collect a nitrogen oxide parameter at a denitration outlet of the denitration system as a second nitrogen oxide parameter; a third collecting module, configured to collect a nitrogen oxide parameter from a total exhaust port of the denitration system as a third nitrogen oxide parameter; a determination module, configured to determine a current amount of ammonia required by the denitration system based on at least one of the current boiler parameter, the first nitrogen oxide parameter, the second nitrogen oxide parameter, and the third nitrogen oxide parameter; The ammonia injection module is used to inject ammonia into the denitration system according to the currently required amount of ammonia.

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