A nitrogen flow rate determination method, device, computer equipment and storage medium

Abstract

The present application relates to the technical field of flue gas purification, and discloses a nitrogen flow determination method and device, computer equipment and a storage medium, the method comprising: obtaining flue gas data in the flue gas purification process, calculating the sulfur removal mass according to the flue gas data; obtaining active coke data in the active coke resolution process, and obtaining the required safe nitrogen flow in the active coke resolution process under a preset standard according to the sulfur removal mass and the active coke data; determining whether the system full load negative pressure meets the safe nitrogen flow, and if so, determining the resolution nitrogen flow range according to the active coke data and the current sulfur removal mass; and determining the target nitrogen flow according to the safe nitrogen flow and the resolution nitrogen flow range. The present application increases the consideration of nitrogen flow during the active coke resolution process, improves the resolution effect in the active coke resolution process, and reduces the sulfur content in the resolved active coke.

Description

Technical Field

[0001] This invention relates to the field of flue gas purification technology, specifically to a method, apparatus, computer equipment, and storage medium for determining nitrogen flow rate. Background Technology

[0002] In the field of flue gas purification, activated coke has been widely used to remove sulfur-containing or nitrate-containing gases from flue gas. Activated coke can remove pollutants such as sulfur dioxide and nitrogen oxides during the contact process between the activated coke and the flue gas in the purification tower. However, its adsorption and catalytic performance will gradually decrease with the extension of the usage time. Therefore, the activated coke discharged from the purification tower needs to be regenerated through a desorption process before it can be recycled.

[0003] The desorption process refers to heating activated coke to approximately 400℃ under nitrogen protection, causing the adsorbed sulfur, ammonium salts, and other substances to decompose and release, thus restoring the adsorption and catalytic functions of the activated coke. Only complete desorption can ensure the recyclability of the activated coke. Activated coke desorption utilizes a tube-and-shell heat exchanger. The activated coke moves from top to bottom within the tubes under its own gravity. High-temperature waste gas is passed between the tubes to heat the activated coke. Simultaneously, to ensure safety and prevent combustion, inert nitrogen is introduced at the top of the tubes to prevent combustion between the activated coke and the flue gas at high temperatures. In the lower part of the heated tube section, the nitrogen and the desorption gas released by the activated coke are drawn away by a fan, achieving the desorption and regeneration of the activated coke.

[0004] The core objective of activated coke desorption is to achieve complete desorption and performance recovery of the activated coke. In daily operations, this is often expressed as the desorption rate or the sulfur content after desorption; a higher desorption rate or a lower sulfur content indicates a better desorption effect. Under the same desorption conditions, the desorbed sulfur content increases with the increase of adsorbed sulfur content. Therefore, when the pollutant load increases excessively, incomplete desorption may occur, meaning the desorbed sulfur content fails to meet the process standard requirements, thus affecting the flue gas purification effect.

[0005] In existing technologies, when desorbing activated coke, the nitrogen flow rate is set only according to the nitrogen flow rate required to ensure the safety of the desorption process in order to avoid combustion of the activated coke. The impact of nitrogen flow rate on the desorption effect is not considered, and the desorption effect of activated coke cannot be guaranteed. Summary of the Invention

[0006] In view of this, the present invention provides a method, apparatus, computer equipment and storage medium for determining nitrogen flow rate, so as to solve the problem that the analysis effect cannot be guaranteed when setting nitrogen flow rate.

[0007] In a first aspect, the present invention provides a method for determining nitrogen flow rate, the method comprising: Acquire flue gas data during the flue gas purification process, and calculate the desulfurization mass based on the flue gas data; Acquire activated coke data during the activated coke desorption process, and based on the desulfurization quality and the activated coke data, obtain the safe nitrogen flow rate required during the activated coke desorption process under a preset oxygen content standard; Determine whether the system's full-load negative pressure meets the specified safe nitrogen flow rate; If the system is under full load negative pressure and the safe nitrogen flow rate is met, the range of analytical nitrogen flow rate is determined based on the activated coke data and the current desulfurization quality. The target nitrogen flow rate is determined based on the safe nitrogen flow rate and the analytical nitrogen flow rate range, so as to perform activated coke analytical based on the target nitrogen flow rate.

[0008] By acquiring flue gas data during the flue gas purification process, the desulfurization quality is obtained. Based on the desulfurization quality and activated coke data, a safe nitrogen flow rate is calculated to ensure the safety of the desorption process. When the system is under full load and negative pressure, meeting the safe nitrogen flow rate, the desorption nitrogen flow rate range is calculated. Finally, the target nitrogen flow rate is determined based on the safe nitrogen flow rate and the desorption nitrogen flow rate range, and activated coke desorption is performed based on the target nitrogen flow rate. This method not only ensures the safety of the desorption process but also further guarantees the desorption effect of the activated coke.

[0009] In one optional embodiment, the flue gas data in the flue gas purification process includes: flue gas flow rate, inlet sulfur concentration, and outlet sulfur concentration, and the calculation of desulfurization quality based on the flue gas data includes: The desulfurization quality is calculated based on the flue gas flow rate, inlet sulfur concentration, and outlet sulfur concentration.

[0010] By obtaining the flue gas flow rate, inlet sulfur concentration, and outlet sulfur concentration during the flue gas purification process, and using these to calculate the desulfurization quality, a more accurate sulfur quality can be obtained, thus improving the calculation accuracy.

[0011] In one optional implementation, the method further includes; If the system's full-load negative pressure does not meet the safe nitrogen flow rate, the inlet flue gas flow rate and / or inlet sulfur concentration in the flue gas purification process are reduced, and the process returns to the step of acquiring flue gas data in the flue gas purification process and calculating the desulfurization quality based on the flue gas data, until the system's full-load negative pressure meets the safe nitrogen flow rate.

[0012] When the system's full-load negative pressure does not meet the required safe nitrogen flow rate, the inlet flue gas flow rate and / or inlet sulfur concentration in the flue gas purification process are reduced to decrease the safe nitrogen flow rate required to ensure safety. This allows the system's slow-combining negative pressure to guarantee the safe nitrogen flow rate, thereby ensuring the safety of the desorption process.

[0013] In one optional embodiment, the activated coke data during the activated coke desorption process includes: activated coke sulfur content after adsorption, activated coke sulfur content after desorption, activated coke bulk density after adsorption, activated coke bulk density after desorption, and activated coke true density. The step of determining the safe nitrogen flow rate required during activated coke desorption under a preset oxygen content standard, based on the desulfurization quality and the activated coke data, includes: The activated coke circulation rate is calculated based on the desulfurization mass and the activated coke data, including the sulfur content of the activated coke after adsorption, the sulfur content of the activated coke after desorption, the bulk density of the activated coke after adsorption, and the bulk density of the activated coke after desorption. Based on the activated coke circulation rate and the activated coke true density, calculate the safe nitrogen flow rate required during the activated coke desorption process under a preset oxygen content standard.

[0014] By acquiring various data from the activated carbon during the desorption process, the accurate activated carbon circulation rate can be calculated, thereby obtaining the required safe nitrogen flow rate. This makes the calculated safe nitrogen flow rate more accurate and ensures the safety of the gas desorption process.

[0015] In one optional implementation, determining the desorption nitrogen flow rate range based on the activated coke data and desulfurization quality includes: The volume of sulfur-containing gas removed is determined based on the sulfur removal mass. Based on the relationship between the sulfur content of the activated coke after analysis and the preset target value in the activated coke data, and the volume of the sulfur-containing gas extracted, the range of nitrogen flow rate for analysis is determined.

[0016] The desorption effect of the activated carbon is used to determine the range of nitrogen flow rate, so that the desorption effect of the activated carbon can be guaranteed when determining the target nitrogen flow rate.

[0017] In one optional implementation, determining the target nitrogen flow rate based on the safe nitrogen flow rate and the analytical nitrogen flow rate range includes: When the safe nitrogen flow rate is greater than the minimum value of the analytical nitrogen flow rate range, the safe nitrogen flow rate is determined as the target nitrogen flow rate.

[0018] Based on the relationship between the safe nitrogen flow rate and the analytical nitrogen flow rate range, the target nitrogen flow rate is determined so that the final target nitrogen flow rate can balance safety and analytical effect.

[0019] In an optional implementation, determining the target nitrogen flow rate based on the safe nitrogen flow rate and the analytical nitrogen flow rate range further includes: When the safe nitrogen flow rate is less than the minimum value of the analytical nitrogen flow rate range, the nitrogen flow rate is adjusted within the analytical nitrogen flow rate range until the sulfur content of the analytical activated coke in the activated coke data is less than the preset target value, and then the current nitrogen flow rate is determined as the target nitrogen flow rate.

[0020] When the safe nitrogen flow rate is lower than the desorption nitrogen flow rate range, adjust the nitrogen flow rate within the desorption nitrogen flow rate range until the desorption effect of the activated coke reaches the preset value. Then determine the target nitrogen flow rate to further ensure the desorption effect.

[0021] In a second aspect, the present invention provides a nitrogen flow rate determination device, the device comprising: The flue gas data acquisition module is used to acquire flue gas data during the flue gas purification process and calculate the desulfurization quality based on the flue gas data. The safe nitrogen flow rate determination module is used to acquire activated coke data during the activated coke desorption process, and to obtain the safe nitrogen flow rate required during the activated coke desorption process under a preset oxygen content standard based on the desulfurization quality and the activated coke data. The system negative pressure judgment module is used to determine whether the system full-load negative pressure meets the safe nitrogen flow rate; if the system full-load negative pressure meets the safe nitrogen flow rate, the analytical nitrogen flow rate range is determined based on the activated coke data and the current desulfurization quality. The target nitrogen flow rate determination module is used to determine the target nitrogen flow rate based on the safe nitrogen flow rate and the analytical nitrogen flow rate range, so as to perform activated coke analytical based on the target nitrogen flow rate.

[0022] Thirdly, the present invention provides a computer device, comprising: a memory and a processor, the memory and the processor being communicatively connected to each other, the memory storing computer instructions, and the processor executing the computer instructions to perform the nitrogen flow determination device method of the first aspect or any corresponding embodiment described above.

[0023] Fourthly, the present invention provides a computer-readable storage medium storing computer instructions for causing a computer to perform the nitrogen flow rate determination device method of the first aspect or any corresponding embodiment described above. Attached Figure Description

[0024] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0025] Figure 1 This is a flowchart illustrating a method for determining nitrogen flow rate according to an embodiment of the present invention; Figure 2 This is a flowchart illustrating another method for determining nitrogen flow rate according to an embodiment of the present invention; Figure 3 This is a flowchart illustrating step S203 in another nitrogen flow rate determination method according to an embodiment of the present invention. Figure 4 This is a structural block diagram of a nitrogen flow rate determination device according to an embodiment of the present invention; Figure 5 This is a schematic diagram of the hardware structure of a computer device according to an embodiment of the present invention. Detailed Implementation

[0026] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0027] In flue gas purification, activated carbon is typically used to remove pollutants such as sulfur dioxide. However, the adsorption effect of activated carbon on pollutants like sulfur dioxide weakens over time, necessitating desorption and regeneration to ensure its reusability. During desorption, the activated carbon, laden with sulfur dioxide, falls from the top of a desorption pipe under its own weight. The pipe is typically exposed to high-temperature exhaust gas to maintain a high-temperature environment inside for desorption. To prevent combustion due to the high temperature, an inert gas, usually nitrogen, is introduced into the pipe for protection. However, the nitrogen flow rate is often set primarily to protect the activated carbon, resulting in a flow rate that may not guarantee effective desorption.

[0028] To address this, this invention provides a method for determining nitrogen flow rate. By calculating the safe nitrogen flow rate to ensure the safety of activated coke and the range of nitrogen flow rates to ensure the desorption effect, the target nitrogen flow rate is finally determined for activated coke desorption. This method further ensures the desorption effect of activated coke while ensuring the safety of the desorption process.

[0029] According to an embodiment of the present invention, a method for determining nitrogen flow rate is provided. It should be noted that the steps shown in the flowchart in the accompanying drawings can be executed in a computer system such as a set of computer-executable instructions. Furthermore, although a logical order is shown in the flowchart, in some cases, the steps shown or described may be executed in a different order than that shown here.

[0030] This embodiment provides a method for determining nitrogen flow rate, which can be used in the above-mentioned activated char desorption. Figure 1 This is a flowchart of a nitrogen flow rate determination method according to an embodiment of the present invention, such as... Figure 1 As shown, the process includes the following steps: Step S101: Obtain flue gas data during the flue gas purification process and calculate the desulfurization quality based on the flue gas data.

[0031] During the flue gas purification process, the flue gas contains pollutants such as sulfur dioxide. Activated coke is used to adsorb and purify the pollutants in the flue gas. Data before and after the flue gas purification is obtained to calculate the desulfurization mass, that is, the mass of sulfur dioxide removed during the purification process.

[0032] Step S102: Obtain activated coke data during the activated coke desorption process. Based on the desulfurization quality and activated coke data, obtain the safe nitrogen flow rate required during the activated coke desorption process under the preset oxygen content standard.

[0033] After the activated carbon adsorbs the pollutant gas, it needs to be desorbed to restore its adsorption capacity. Activated carbon data is obtained during the desorption process. Based on this data and the mass of sulfur dioxide removed in the previous steps, the safe nitrogen flow rate required for the activated carbon desorption process under a preset oxygen content standard is calculated. The safe nitrogen flow rate is used to ensure that the oxygen content during the desorption process is lower than the preset oxygen content standard, preventing activated carbon combustion and ensuring the safety of the desorption process.

[0034] Step S103: Determine whether the system full-load negative pressure meets the safe nitrogen flow rate; If the system is under full load and negative pressure, the safe nitrogen flow rate is met. The range of nitrogen flow rate for analysis is determined based on the activated coke data and the current desulfurization quality.

[0035] After obtaining the safe nitrogen flow rate to ensure the safety of the desorption process, it is necessary to consider whether the system negative pressure under full-load operation of the current system fan can achieve the safe nitrogen flow rate. If the full-load negative pressure of the system can meet the safe nitrogen flow rate, the desorption nitrogen flow rate range is determined based on the activated coke data during the desorption process and the current desulfurization quality. Here, the current desulfurization quality refers to the amount of sulfur dioxide removed corresponding to the safe nitrogen flow rate, and the desorption nitrogen flow rate range refers to the nitrogen flow rate range that allows the activated coke to achieve a better desorption effect.

[0036] In step S104, the target nitrogen flow rate is determined based on the safe nitrogen flow rate and the range of the desorption nitrogen flow rate, so as to perform activated coke desorption based on the target nitrogen flow rate.

[0037] The target nitrogen flow rate is determined based on the relationship between the safe nitrogen flow rate and the desorption nitrogen flow rate range. The target nitrogen flow rate can balance safety and desorption effect during the desorption process, and activated coke desorption is performed based on the target nitrogen flow rate.

[0038] In one example, if, after determining the final target nitrogen flow rate, the system negative pressure is too low and increasing the fan frequency still cannot meet the requirements, then production needs to be limited to reduce the total sulfur at the flue gas inlet. If the total sulfur at the flue gas inlet changes, repeat the above steps.

[0039] The nitrogen flow rate determination method provided in this embodiment obtains flue gas data during the activated carbon purification process and activated carbon data during the activated carbon desorption process. It calculates the safe nitrogen flow rate to ensure the safety of activated carbon desorption and the desorption nitrogen flow rate range to ensure the desorption effect. Based on the relationship between the safe nitrogen flow rate and the desorption nitrogen flow rate range, the target nitrogen flow rate is finally determined for activated carbon desorption, so that both safety and desorption effect can be taken into account during the activated carbon desorption process.

[0040] According to an embodiment of the present invention, another embodiment of a nitrogen flow rate determination method is provided, which can be used in the activated carbon desorption process. Figure 2 This is a flowchart of another nitrogen flow rate determination method according to an embodiment of the present invention, such as... Figure 2 As shown, the process includes the following steps: Step S201: Obtain flue gas data during the flue gas purification process and calculate the desulfurization quality based on the flue gas data.

[0041] Specifically, in step S201 above, the flue gas data in the flue gas purification process includes: flue gas flow rate, inlet sulfur concentration, and outlet sulfur concentration. Calculating the desulfurization quality based on the flue gas data includes: calculating the desulfurization quality based on the flue gas flow rate, inlet sulfur concentration, and outlet sulfur concentration.

[0042] Flue gas containing pollutants such as sulfur dioxide enters the purification system through the inlet, is purified, and then flows out through the outlet. The system obtains the flue gas flow rate, the inlet sulfur concentration (i.e., the sulfur dioxide concentration at the inlet), and the outlet sulfur concentration (i.e., the sulfur dioxide concentration at the outlet) during the purification process. The mass of sulfur dioxide removed is calculated based on these parameters. By obtaining the flue gas flow rate, inlet sulfur concentration, and outlet sulfur concentration during the purification process and using these parameters to calculate the removed sulfur mass, a more accurate sulfur mass can be obtained, improving the calculation accuracy.

[0043] For example, suppose the mass of sulfur dioxide removed per unit time is The unit is milligrams per hour, and the inlet sulfur dioxide concentration is... The unit is milligrams per cubic meter, and the sulfur dioxide concentration at the outlet is... The unit is milligrams per cubic meter, and the flue gas flow rate is... The unit is cubic meters per hour. The specific formula for calculating the mass of sulfur dioxide removed is as follows:

[0044] It should be noted that all the above data can be obtained directly, and there are no restrictions on the specific units. This formula is only used to express the calculation relationship between the mass of sulfuric acid removed and the flue gas data. At the same time, due to factors such as pressure, physical quantities, and units in different flue gas purification systems, the formula will vary. Therefore, coefficients can be set according to the actual situation to obtain the desulfurization mass that conforms to the actual situation. This formula is only used to reflect the calculation relationship.

[0045] Step S202: Obtain activated coke data during the activated coke desorption process. Based on the desulfurization quality and activated coke data, obtain the safe nitrogen flow rate required during the activated coke desorption process under the preset oxygen content standard.

[0046] Specifically, refer to Figure 2 The above step S202 includes: Step S2021: Obtain activated coke data during the activated coke desorption process. The activated coke data includes: activated coke sulfur content after adsorption, activated coke sulfur content after desorption, activated coke bulk density after adsorption, activated coke bulk density after desorption, and activated coke true density.

[0047] The above data can be obtained directly from the analysis system. The activated coke bulk density can be understood as the mass of the activated coke particles piled up divided by the volume of the pile. The true density of activated coke can be understood as the density of the activated coke particles. The sulfur content of activated coke after adsorption refers to the proportion of sulfur dioxide in the activated coke pile before desorption, after adsorption is complete. The sulfur content of activated coke after desorption refers to the proportion of sulfur dioxide in the activated coke pile after desorption. The activated coke bulk density after adsorption and the activated coke bulk density after desorption are understood with reference to the definitions of activated coke bulk density mentioned above.

[0048] Step S2022: Calculate the activated coke circulation rate based on the desulfurization quality and the activated coke data, including the sulfur content of the activated coke after adsorption, the sulfur content of the activated coke after desorption, the bulk density of the activated coke after adsorption, and the bulk density of the activated coke after desorption.

[0049] The activated coke circulation rate refers to how much activated coke is consumed per unit time during the desorption process, and its unit can be tons per hour; the activated coke bulk density can be measured in tons per cubic meter.

[0050] For ease of understanding, the activated char circulation speed can be set to... The analyzed activated coke bulk density is set to The bulk density of the activated coke after adsorption was set to The activated char sulfur content after analysis was set to The activated char sulfur content after adsorption is set to The specific calculation method for the activated carbon circulation speed is as follows:

[0051] in The desulfurization mass calculated in step S201 above should be noted that units need to be consistent in the specific calculation. The formulas in this application are only for explaining the calculation relationship between various data.

[0052] Step S2023: Calculate the safe nitrogen flow rate required during activated coke desorption under the preset oxygen content standard, based on the activated coke circulation rate and the true density of the activated coke.

[0053] During the desorption process, the activated coke pile formed by the activated coke particles has certain voids inside, and air exists between these voids. In order to ensure the safe desorption process of activated coke at high temperature, it is necessary to introduce nitrogen gas at a safe flow rate to ensure that the oxygen content during the desorption process is lower than the preset standard.

[0054] The specific calculation method can be obtained through the following formula:

[0055] in This refers to the safe nitrogen flow rate. The activated coke circulation rate obtained in step S2022 above, 1 represents the true density of activated coke, i.e., the density of activated coke particles; 21 represents the percentage of oxygen in the air; and 0.25 represents the average percentage of oxygen in industrial nitrogen. This is a preset oxygen content standard to ensure the safety of the activated carbon desorption process.

[0056] pass The volume of the gaps in the active coke reactor is calculated, and the air in these gaps is used to calculate the final safe nitrogen flow rate by means of the ratio between the oxygen content in the air, the preset oxygen content standard, and the average oxygen content in the nitrogen.

[0057] By acquiring various data from the activated carbon during the desorption process, the accurate activated carbon circulation rate can be calculated, thereby obtaining the required safe nitrogen flow rate. This makes the calculated safe nitrogen flow rate more accurate and ensures the safety of the gas desorption process.

[0058] Step S203: Determine whether the system full-load negative pressure meets the safe nitrogen flow rate; if the system full-load negative pressure meets the safe nitrogen flow rate, determine the analytical nitrogen flow rate range based on the activated coke data and the current desulfurization quality.

[0059] For details, please refer to Figure 3 The above step S203 includes: Step S2031: Determine whether the system's full-load negative pressure meets the safe nitrogen flow rate.

[0060] Step S2031A: If the system is under full load and negative pressure, the safe nitrogen flow rate is met. The range of nitrogen flow rate for analysis is determined based on the activated coke data and the current desulfurization quality.

[0061] Specifically, in step S2031A, determining the desorption nitrogen flow rate range based on the activated coke data and the current desulfurization quality includes: determining the volume of sulfur-containing gas desorbed based on the desulfurization quality; and determining the desorption nitrogen flow rate range based on the relationship between the sulfur content of the activated coke after desorption and the preset target value, as well as the volume of sulfur-containing gas desorbed. Obtaining the desorption nitrogen flow rate range based on the desorption effect of the activated coke ensures that the desorption effect of the activated coke is maintained when subsequently determining the target nitrogen flow rate.

[0062] The determination of the volume of sulfur-containing gas released based on the desulfurization mass can be understood as follows: the amount of sulfur dioxide adsorbed by the activated coke during flue gas purification, i.e., the desulfurization mass, is the same as the amount of sulfur dioxide released during the desorption process. Although in actual desorption processes, due to limitations in desorption efficiency, not all adsorbed sulfur-containing gas can be released, they are approximated as equal here for ease of calculation. Converting the desulfurization mass, i.e., the adsorbed sulfur dioxide mass, into the corresponding gas volume gives the volume of sulfur dioxide released.

[0063] The effectiveness of the desorption process is represented by the sulfur content of the desorbed activated coke. When the sulfur content is lower than a preset value, the desorption effect is good; in this case, the nitrogen flow rate is set to 1 to 1.5 times the volume of sulfur dioxide gas desorbed. When the sulfur content is higher than the preset value, the desorption effect is poor; in this case, the nitrogen flow rate is set to 1.5 to 2 times the volume of sulfur dioxide gas desorbed. The following specific example can illustrate this: The preset sulfur content is 2%, and the extracted sulfur dioxide gas is If the reactive char sulfur content after analysis is 1%, the nitrogen flow rate after analysis will be... The range is set to, ≤ ≤1.5 If the reactive char sulfur content after analysis is 3%, the nitrogen flow rate after analysis will be... The range is set to 1.5. ≤ ≤2 .

[0064] It should be noted that the above multiple relationships are derived based on the actual situation of each system, and the specific values ​​can be set according to the actual situation; no restrictions are imposed here.

[0065] Step S2031B: If the system full-load negative pressure does not meet the safe nitrogen flow rate, reduce the inlet flue gas flow rate and / or inlet sulfur concentration during the flue gas purification process, and return to the step of obtaining flue gas data during the flue gas purification process and calculating the desulfurization quality based on the flue gas data, until the system full-load negative pressure meets the safe nitrogen flow rate.

[0066] When the system's negative pressure, achieved by the system's fans at full load, is insufficient to reach the required safe nitrogen flow rate, the required safe nitrogen flow rate must be reduced to ensure the safety of the desorption process, allowing the system fans to meet the requirements. Therefore, the inlet flue gas volume and / or inlet flue gas sulfur concentration in the flue gas purification process can be reduced. By decreasing these two values, the quality of sulfur removal can be reduced, thereby reducing the activated coke circulation speed in the subsequent desorption process, ultimately lowering the safe nitrogen flow rate. After obtaining the new safe nitrogen flow rate, if the system fans still cannot meet the requirements, the inlet flue gas flow rate and / or inlet sulfur concentration need to be further reduced until the system's full-load negative pressure meets the safe nitrogen flow rate, and step S2031A is executed.

[0067] When the system's full-load negative pressure does not meet the required safe nitrogen flow rate, the inlet flue gas flow rate and / or inlet sulfur concentration in the flue gas purification process are reduced to decrease the safe nitrogen flow rate required to ensure safety. This allows the system's slow-combining negative pressure to guarantee the safe nitrogen flow rate, thereby ensuring the safety of the desorption process.

[0068] Step S204: Determine the target nitrogen flow rate based on the safe nitrogen flow rate and the range of the desorption nitrogen flow rate, so as to perform activated coke desorption based on the target nitrogen flow rate.

[0069] Specifically, step S204 includes the following steps: Step S204A: When the safe nitrogen flow rate is greater than the minimum value of the analytical nitrogen flow rate range, the safe nitrogen flow rate is determined as the target nitrogen flow rate.

[0070] For example, if the calculated safe nitrogen flow rate is 300 cubic meters per hour and the calculated analytical nitrogen flow rate ranges from 200 to 400 cubic meters per hour, then the safe nitrogen flow rate is within the analytical nitrogen flow rate range. Directly using the safe nitrogen flow rate as the target nitrogen flow rate can ensure both the safety of the analytical process and the analytical effect.

[0071] For example, if the calculated safe nitrogen flow rate is 500 cubic meters per hour, and the calculated analytical nitrogen flow rate range is 200 to 400 cubic meters per hour, then to ensure the safety of the analytical process, the safe nitrogen flow rate needs to be set as the target nitrogen flow rate. Furthermore, since the safe nitrogen flow rate is higher than the analytical nitrogen flow rate range, the analytical effect can also be guaranteed.

[0072] Based on the relationship between the safe nitrogen flow rate and the analytical nitrogen flow rate range, the target nitrogen flow rate is determined so that the final target nitrogen flow rate can balance safety and analytical effect.

[0073] Step S204B: When the safe nitrogen flow rate is less than the minimum value of the analytical nitrogen flow rate range, adjust the nitrogen flow rate within the analytical nitrogen flow rate range until the sulfur content of the analytical activated coke in the activated coke data is less than the preset target value, and then determine the current nitrogen flow rate as the target nitrogen flow rate.

[0074] If the calculated safe nitrogen flow rate is less than the desorption nitrogen flow rate, the nitrogen flow rate is adjusted within the desorption nitrogen flow rate range. During this adjustment, if the reactive char sulfur content after desorption is less than the preset target value, the nitrogen flow rate at that point is determined as the target nitrogen flow rate. Because the desorption nitrogen flow rate range is greater than the safe nitrogen flow rate, the desorption process can be ensured to be safe while also guaranteeing that the desorption effect meets the requirements during the adjustment process. This can be understood through the following example.

[0075] For example, if the calculated safe nitrogen flow rate is 100 cubic meters per hour, and the calculated analytical nitrogen flow rate range is 200 to 400 cubic meters per hour, then the nitrogen flow rate can be adjusted starting from 200 cubic meters per hour. When adjusted to 230 cubic meters per hour, the sulfur content in the activated coke after analytical treatment meets the preset value. Therefore, 230 cubic meters per hour is determined as the target nitrogen flow rate, and this is used for activated coke analytical treatment.

[0076] When the safe nitrogen flow rate is lower than the desorption nitrogen flow rate range, adjust the nitrogen flow rate within the desorption nitrogen flow rate range until the desorption effect of the activated coke reaches the preset value. Then determine the target nitrogen flow rate to further ensure the desorption effect.

[0077] To facilitate understanding of the technical solution of this invention, specific processes under three different conditions are provided, including the entire process of this method, as detailed below: Example 1, flue gas flow rate 1.2 million Nm³ 3 / h, inlet SO2 sulfur concentration 650mg / m³ 3 The sulfur concentration of SO2 at the outlet is 0.4 mg / m³. 3 The total sulfur removed per hour was calculated to be 389.8 kg / h; the sulfur content after adsorption and desorption by the activated coke was 3.5% and 1.7%, respectively, and the bulk density after adsorption was 0.803 t / m³. 3 The bulk density after analysis is 0.742 t / m³. 3 Based on the formula, the activated coke circulation rate is calculated to be 18.7 t / h; the true density of the activated coke is 1.489 t / m³. 3 The oxygen content control standard for the analytical tower is ≤1%. Based on the activated coke circulation rate and bulk density, and using the formula, a safe nitrogen flow rate V1 = 345 m³ / s is calculated. 3 / h.

[0078] Under safe nitrogen flow conditions, the system negative pressure is -350±50Pa, and the system fan can operate at full load, meeting the process requirements. The sulfur content after activated coke desorption meets the desorption requirement of <2.0%, and the nitrogen flow rate V2 that meets the desorption requirement ranges from 273 to 409 m³ / h. 3 / h; Since V1 is within the control range of V2, the final nitrogen flow rate is determined to be 345m³ / h. 3 / h.

[0079] Example 2, flue gas flow rate 1.1 million Nm³ 3 / h, inlet SO2 sulfur concentration 550mg / m³ 3 The sulfur concentration of SO2 at the outlet is 0.5 mg / m³. 3 The total sulfur removed per hour was calculated to be 302.2 kg / h; the sulfur content after adsorption and desorption by the activated coke was 4.0% and 2.1%, respectively, and the bulk density after adsorption was 0.823 t / m³. 3 The bulk density after analysis is 0.742 t / m³. 3 The calculated circulating rate of activated coke is 12.9 t / h; the true density of activated coke is 1.510 t / m³. 3 The oxygen content control standard for the analytical column is ≤1%. Based on the activated coke circulation rate and bulk density, the calculated safe nitrogen flow rate V1 = 242 m³ / s. 3 / h.

[0080] Under safe nitrogen flow rate conditions, the system negative pressure is -350±50Pa, which meets the process requirements; the sulfur content after activated coke desorption meets the desorption requirement of <2.0%, and the calculated nitrogen flow rate V2 that meets the desorption requirements is in the range of 317-423m³. 3 / h; Since V1 is less than the control range of V2, the final nitrogen flow rate is determined to be 317-423m³. 3The nitrogen flow rate is gradually increased within this range until the sulfur content after desorption is <2.0%, at which point the nitrogen flow rate is no longer adjusted.

[0081] Example 3, flue gas flow rate 1.3 million Nm³ 3 / h, inlet SO2 sulfur concentration 720mg / m³ 3 The sulfur concentration of SO2 at the outlet is 0.5 mg / m³. 3 The total sulfur removed per hour was calculated to be 468 kg / h; the sulfur content after adsorption and desorption by the activated coke was 2.8% and 1.9%, respectively, and the bulk density after adsorption was 0.785 t / m³. 3 The bulk density after analysis is 0.712 t / m³. 3 The calculated circulating rate of activated coke is 39.4 t / h; the true density of activated coke is 1.475 t / m³. 3 The oxygen content control standard for the analytical column is ≤1%. Based on the activated coke circulation rate and bulk density, the calculated safe nitrogen flow rate V1 = 763 m³ / s. 3 / h.

[0082] At a safe nitrogen flow rate of 763m 3 Under the condition of / h, after increasing the fan frequency to full load, the system negative pressure is -100±50Pa. The negative pressure is still too low. Even with the fan running at full capacity, the system cannot achieve the required negative pressure and does not meet the process requirements. Therefore, production can only be controlled to reduce the total sulfur at the inlet.

[0083] With other parameters remaining constant, the flue gas flow rate and inlet SO2 concentration were changed to 1.15 million Nm³. 3 / h and 520 mg / m 3 The total sulfur removal rate per hour was recalculated to be 299 kg / h, the activated coke circulation rate was 25.2 t / h, and the safe nitrogen flow rate V1 was calculated to be 500 m³ / h. 3 / h. At this point, after increasing the fan frequency to full load, the system negative pressure is -300±50Pa, which meets the process requirements.

[0084] After desorption of activated coke, the sulfur content meets the desorption requirement of <2.0%, and the nitrogen flow rate V2 that meets the desorption requirement is in the range of 209-313 m³ / h. 3 / h. Since V1 is within the control range of V2, the final nitrogen flow rate is determined to be 500m³ / h. 3 / h.

[0085] The above three examples illustrate how, under different circumstances, the final target nitrogen flow rate was calculated using the nitrogen flow rate determination method provided by this invention, and activated coke analysis was performed based on this nitrogen flow rate. These examples are only used to help understand the invention and are not intended to impose any limitations.

[0086] The nitrogen flow rate determination method provided in this invention obtains various data from flue gas data, calculates the desulfurization quality, and combines this with various data from activated coke data to calculate the activated coke circulation rate, thereby obtaining a safe nitrogen flow rate to ensure the safety of the activated coke desorption process. Simultaneously, it considers whether the system fan load can provide the negative pressure required for the safe nitrogen flow rate, further adjusting the flue gas data to ensure a match between the safe nitrogen flow rate and the system fan. Next, it determines the desorption nitrogen flow rate range based on the actual desorption effect of the activated coke to ensure that the desorption effect meets the requirements. Finally, it determines the final target nitrogen flow rate based on the relationship between the safe nitrogen flow rate and the desorption nitrogen flow rate range for activated coke desorption. The target nitrogen flow rate determined by this method can balance the safety and desorption effect during activated coke desorption.

[0087] This embodiment also provides a nitrogen flow rate determination device, which is used to implement the above embodiments and preferred embodiments; details already described will not be repeated. As used below, the term "module" can refer to a combination of software and / or hardware that performs a predetermined function. Although the device described in the following embodiments is preferably implemented in software, hardware implementation, or a combination of software and hardware, is also possible and contemplated.

[0088] This embodiment provides a nitrogen flow rate determination device, such as... Figure 4 As shown, it includes: The flue gas data acquisition module 401 is used to acquire flue gas data during the flue gas purification process and calculate the desulfurization quality based on the flue gas data.

[0089] The safe nitrogen flow rate determination module 402 is used to acquire activated coke data during the activated coke desorption process and, based on the desulfurization quality and activated coke data, obtain the safe nitrogen flow rate required during the activated coke desorption process under a preset oxygen content standard.

[0090] The system negative pressure judgment module 403 is used to determine whether the system full-load negative pressure meets the safe nitrogen flow rate; if the system full-load negative pressure meets the safe nitrogen flow rate, the analytical nitrogen flow rate range is determined based on the activated coke data and the current desulfurization quality.

[0091] The target nitrogen flow rate determination module 404 is used to determine the target nitrogen flow rate based on the safe nitrogen flow rate and the desorption nitrogen flow rate range, so as to perform activated coke desorption based on the target nitrogen flow rate.

[0092] In some optional implementations, the flue gas data during the flue gas purification process includes: flue gas flow rate, inlet sulfur concentration, and outlet sulfur concentration. The flue gas data acquisition module 401 calculates the desulfurization quality based on the flue gas flow rate, inlet sulfur concentration, and outlet sulfur concentration.

[0093] In some optional implementations, the system negative pressure determination module 403 includes: The negative pressure judgment unit is used to determine whether the full-load negative pressure of the system meets the safe nitrogen flow rate.

[0094] The nitrogen flow rate range determination unit is used to determine the nitrogen flow rate range based on activated coke data and the current desulfurization quality when the system is under full load and negative pressure meets the safe nitrogen flow rate.

[0095] The flue gas data adjustment unit is used to reduce the inlet flue gas flow rate and / or inlet sulfur concentration during the flue gas purification process when the system full-load negative pressure does not meet the safe nitrogen flow rate, and return to the steps of acquiring flue gas data during the flue gas purification process and calculating the desulfurization quality based on the flue gas data, until the system full-load negative pressure meets the safe nitrogen flow rate.

[0096] In some optional embodiments, the activated coke data during the activated coke desorption process includes: activated coke sulfur content after adsorption, activated coke sulfur content after desorption, activated coke bulk density after adsorption, activated coke bulk density after desorption, and activated coke true density; the safe nitrogen flow rate determination module 402 is used to calculate the activated coke circulation rate based on the desulfurization mass and the activated coke data including activated coke sulfur content after adsorption, activated coke sulfur content after desorption, activated coke bulk density after adsorption, and activated coke bulk density after desorption; and to calculate the safe nitrogen flow rate required during the activated coke desorption process under a preset oxygen content standard based on the activated coke circulation rate and the activated coke true density.

[0097] In some optional implementations, the system negative pressure judgment module 403 is specifically used to determine the volume of sulfur-containing gas extracted based on the desulfurization quality; and to determine the nitrogen flow rate range based on the relationship between the sulfur content of the extracted activated coke and the preset target value in the activated coke data, as well as the volume of sulfur-containing gas extracted.

[0098] In some optional implementations, when the safe nitrogen flow rate is greater than the minimum value of the analytical nitrogen flow rate range, the target nitrogen flow rate determination module 404 is specifically used to determine the safe nitrogen flow rate as the target nitrogen flow rate.

[0099] In some optional implementations, when the safe nitrogen flow rate is less than the minimum value of the analytical nitrogen flow rate range, the target nitrogen flow rate determination module 404 is specifically used to adjust the nitrogen flow rate within the analytical nitrogen flow rate range until the sulfur content of the analytical activated coke in the activated coke data is less than a preset target value, and then determine the current nitrogen flow rate as the target nitrogen flow rate.

[0100] Further functional descriptions of the above modules and units are the same as those in the corresponding embodiments described above, and will not be repeated here.

[0101] In this embodiment, the nitrogen flow rate determination device is presented in the form of a functional unit. Here, a unit refers to an ASIC (Application Specific Integrated Circuit) circuit, a processor and memory that execute one or more software or fixed programs, and / or other devices that can provide the above functions.

[0102] This invention also provides a computer device having the above-described features. Figure 4 The nitrogen flow rate determination device shown.

[0103] Please see Figure 5 , Figure 5 This is a schematic diagram of the structure of a computer device provided in an optional embodiment of the present invention, such as... Figure 5 As shown, the computer device includes one or more processors 10, memory 20, and interfaces for connecting the components, including high-speed interfaces and low-speed interfaces. The components communicate with each other via different buses and can be mounted on a common motherboard or otherwise installed as needed. The processors can process instructions executed within the computer device, including instructions stored in or on memory to display graphical information of a GUI on external input / output devices (such as display devices coupled to the interfaces). In some alternative implementations, multiple processors and / or multiple buses can be used with multiple memories and multiple memory modules, if desired. Similarly, multiple computer devices can be connected, each providing some of the necessary operations (e.g., as a server array, a group of blade servers, or a multiprocessor system). Figure 5 Take a processor 10 as an example.

[0104] Processor 10 may be a central processing unit, a network processor, or a combination thereof. Processor 10 may further include a hardware chip. The hardware chip may be an application-specific integrated circuit (ASIC), a programmable logic device (PLD), or a combination thereof. The programmable logic device may be a complex programmable logic device (CAMP), a field-programmable gate array (FPGA), a general-purpose array logic (GDA), or any combination thereof.

[0105] The memory 20 stores instructions executable by at least one processor 10 to cause at least one processor 10 to perform the method shown in the above embodiments.

[0106] The memory 20 may include a program storage area and a data storage area. The program storage area may store the operating system and applications required for at least one function; the data storage area may store data created based on the use of the computer device. Furthermore, the memory 20 may include high-speed random access memory and may also include non-transitory memory, such as at least one disk storage device, flash memory device, or other non-transitory solid-state storage device. In some alternative embodiments, the memory 20 may optionally include memory remotely located relative to the processor 10, and these remote memories may be connected to the computer device via a network. Examples of such networks include, but are not limited to, the Internet, intranets, local area networks, mobile communication networks, and combinations thereof.

[0107] The memory 20 may include volatile memory, such as random access memory; the memory may also include non-volatile memory, such as flash memory, hard disk or solid-state drive; the memory 20 may also include a combination of the above types of memory.

[0108] The computer device also includes an input device 30 and an output device 40. The processor 10, memory 20, input device 30, and output device 40 can be connected via a bus or other means. Figure 5 Taking the example of a connection between China and Israel via a bus.

[0109] Input device 30 can receive input numerical or character information, and generate key signal inputs related to user settings and function control of the computer device, such as a touchscreen, keypad, mouse, trackpad, touchpad, joystick, one or more mouse buttons, trackball, joystick, etc. Output device 40 may include display devices, auxiliary lighting devices (e.g., LEDs), and haptic feedback devices (e.g., vibration motors). The aforementioned display devices include, but are not limited to, liquid crystal displays, light-emitting diodes, displays, and plasma displays. In some alternative embodiments, the display device may be a touchscreen.

[0110] This invention also provides a computer-readable storage medium. The methods described above according to embodiments of the invention can be implemented in hardware or firmware, or implemented as computer code that can be recorded on a storage medium, or implemented as computer code downloaded via a network and originally stored on a remote storage medium or a non-transitory machine-readable storage medium and then stored on a local storage medium. Thus, the methods described herein can be processed by software stored on a storage medium using a general-purpose computer, a dedicated processor, or programmable or dedicated hardware. The storage medium can be a magnetic disk, optical disk, read-only memory, random access memory, flash memory, hard disk, or solid-state drive, etc.; further, the storage medium can also include combinations of the above types of memory. It is understood that computers, processors, microprocessor controllers, or programmable hardware include storage components capable of storing or receiving software or computer code, which, when accessed and executed by the computer, processor, or hardware, implements the methods shown in the above embodiments.

[0111] Although embodiments of the invention have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of the invention, and such modifications and variations all fall within the scope defined by the appended claims.

Claims

1. A method for determining nitrogen flow rate, said method being applied to activated carbon desorption, characterized in that, The method includes: Acquire flue gas data during the flue gas purification process, and calculate the desulfurization mass based on the flue gas data; Acquire activated coke data during the activated coke desorption process, and based on the desulfurization quality and the activated coke data, obtain the safe nitrogen flow rate required during the activated coke desorption process under a preset oxygen content standard; Determine whether the system's full-load negative pressure meets the specified safe nitrogen flow rate; If the system is under full load negative pressure and the safe nitrogen flow rate is met, the range of analytical nitrogen flow rate is determined based on the activated coke data and the current desulfurization quality. The target nitrogen flow rate is determined based on the safe nitrogen flow rate and the desorption nitrogen flow rate range, so as to perform activated coke desorption based on the target nitrogen flow rate; The activated coke data in the activated coke desorption process includes: activated coke sulfur content after adsorption, activated coke sulfur content after desorption, activated coke bulk density after adsorption, activated coke bulk density after desorption, and activated coke true density. The step of determining the safe nitrogen flow rate required during activated coke desorption under a preset oxygen content standard, based on the desulfurization quality and the activated coke data, includes: The activated coke circulation rate is calculated based on the desulfurization mass and the activated coke data, including the sulfur content of the activated coke after adsorption, the sulfur content of the activated coke after desorption, the bulk density of the activated coke after adsorption, and the bulk density of the activated coke after desorption. Based on the activated carbon circulation rate and the activated carbon true density, calculate the safe nitrogen flow rate required during the activated carbon desorption process under the preset oxygen content standard. The process of determining the analytical nitrogen flow rate range based on the activated coke data and desulfurization quality includes: The volume of sulfur-containing gas removed is determined based on the sulfur removal mass. Based on the relationship between the sulfur content of the activated coke after analysis and the preset target value in the activated coke data, and the volume of the sulfur-containing gas extracted, the range of nitrogen flow rate for analysis is determined.

2. The method according to claim 1, characterized in that, The flue gas data in the flue gas purification process includes: flue gas flow rate, inlet sulfur concentration, and outlet sulfur concentration. The calculation of the desulfurization quality based on the flue gas data includes: The desulfurization quality is calculated based on the flue gas flow rate, inlet sulfur concentration, and outlet sulfur concentration.

3. The method according to claim 2, characterized in that, The method further includes; If the system's full-load negative pressure does not meet the safe nitrogen flow rate, the inlet flue gas flow rate and / or inlet sulfur concentration in the flue gas purification process are reduced, and the process returns to the step of acquiring flue gas data in the flue gas purification process and calculating the desulfurization quality based on the flue gas data, until the system's full-load negative pressure meets the safe nitrogen flow rate.

4. The method according to claim 1, characterized in that, Determining the target nitrogen flow rate based on the safe nitrogen flow rate and the analytical nitrogen flow rate range includes: When the safe nitrogen flow rate is greater than the minimum value of the analytical nitrogen flow rate range, the safe nitrogen flow rate is determined as the target nitrogen flow rate.

5. The method according to claim 1, characterized in that, The step of determining the target nitrogen flow rate based on the safe nitrogen flow rate and the analytical nitrogen flow rate range further includes: When the safe nitrogen flow rate is less than the minimum value of the analytical nitrogen flow rate range, the nitrogen flow rate is adjusted within the analytical nitrogen flow rate range until the sulfur content of the analytical activated coke in the activated coke data is less than the preset target value, and then the current nitrogen flow rate is determined as the target nitrogen flow rate.

6. A nitrogen flow rate determination device, characterized in that, The device includes: The flue gas data acquisition module is used to acquire flue gas data during the flue gas purification process and calculate the desulfurization quality based on the flue gas data. The safe nitrogen flow rate determination module is used to acquire activated coke data during the activated coke desorption process, and to obtain the safe nitrogen flow rate required during the activated coke desorption process under a preset oxygen content standard based on the desulfurization quality and the activated coke data. The system negative pressure judgment module is used to determine whether the system full-load negative pressure meets the safe nitrogen flow rate; if the system full-load negative pressure meets the safe nitrogen flow rate, the analytical nitrogen flow rate range is determined based on the activated coke data and the current desulfurization quality. The target nitrogen flow rate determination module is used to determine the target nitrogen flow rate based on the safe nitrogen flow rate and the analytical nitrogen flow rate range, so as to perform activated coke analytical based on the target nitrogen flow rate; The activated carbon data during the activated carbon desorption process include: sulfur content of activated carbon after adsorption, sulfur content of activated carbon after desorption, bulk density of activated carbon after adsorption, bulk density of activated carbon after desorption, and true density of activated carbon. The safe nitrogen flow rate determination module is used to calculate the activated coke circulation rate based on the desulfurization mass and the activated coke data, including the sulfur content of the activated coke after adsorption, the sulfur content of the activated coke after desorption, the bulk density of the activated coke after adsorption, and the bulk density of the activated coke after desorption; and to calculate the safe nitrogen flow rate required during the activated coke desorption process under a preset oxygen content standard based on the activated coke circulation rate and the true density of the activated coke. The system negative pressure judgment module is specifically used to determine the volume of sulfur-containing gas extracted based on the desulfurization quality; and to determine the nitrogen flow rate range based on the relationship between the sulfur content of the extracted activated coke and the preset target value in the activated coke data, as well as the volume of sulfur-containing gas extracted.

7. A computer device, characterized in that, include: A memory and a processor are communicatively connected, the memory storing computer instructions, and the processor executing the computer instructions to perform the nitrogen flow determination method according to any one of claims 1 to 5.

8. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores computer instructions for causing the computer to perform the nitrogen flow rate determination method according to any one of claims 1 to 5.

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