Calcium-based desulfurization control method of coke oven flue gas desulfurization reactor

Abstract

The invention relates to the technical field of desulfurization, in particular to a calcium-based desulfurization control method of a coke oven flue gas desulfurization reactor. The method comprises the following steps: putting a calcium-based desulfurizing agent into a desulfurization reactor in batches according to a preset putting scheme; then at each monitoring moment, according to the put amount of the calcium-based desulfurizing agent and the gas concentration of each sulfur-containing gas, in combination with the last put amount of the calcium-based desulfurizing agent and the last put moment, the desulfurization performance coefficient of the calcium-based desulfurizing agent is obtained, so that whether the next put amount of the calcium-based desulfurizing agent needs to be adjusted or not is judged; if adjustment is needed, according to the reaction condition parameters of the desulfurization reactor at each monitoring moment, the activity coefficient of the calcium-based desulfurizing agent is obtained, and the next feeding amount of the calcium-based desulfurizing agent is adjusted in combination with the desulfurization performance coefficient. According to the method, the feeding of the calcium-based desulfurizing agent is dynamically regulated and controlled according to the specific performances such as desulfurization performance and reaction activity in the coke oven flue gas desulfurization process, so that the desulfurization effect of the coke oven flue gas is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of desulfurization, and in particular to a calcium-based desulfurization control method for a coke oven flue gas desulfurization reactor. Background Art

[0002] Sulfur dioxide contained in coke oven flue gas , hydrogen sulfide and carbonyl sulfide Sulfur-containing gases such as chlorinated ... ,lime ) as absorbents, chemically reacting with sulfur-containing gases in coke oven flue gas to generate non-volatile sulfides, thereby effectively desulfurizing.

[0003] During the desulfurization treatment process of coke oven flue gas, it is crucial to add an appropriate dose of calcium-based desulfurizer to the desulfurization reactor. The traditional method is to preliminarily estimate the dosage of the calcium-based desulfurizer and then plan the dosage. However, the desulfurization reaction rate is affected by the reaction conditions, making it difficult to determine the timing and dosage of the desulfurizer. Too little calcium-based desulfurizer may lead to incomplete desulfurization, while too much calcium-based desulfurizer will not only cause waste and lead to deposition and scaling in the desulfurization reactor, but may also reduce the desulfurization reaction rate. Therefore, unreasonable addition of calcium-based desulfurizer will affect the desulfurization effect of coke oven flue gas. Summary of the Invention

[0004] In order to solve the technical problem of poor desulfurization effect of coke oven flue gas caused by unreasonable addition of calcium-based desulfurizer, the purpose of the present invention is to provide a calcium-based desulfurization control method for a coke oven flue gas desulfurization reactor. The technical solution adopted is as follows: Obtain the total amount of calcium-based desulfurizer used for coke oven flue gas desulfurization, and add the calcium-based desulfurizer to the desulfurization reactor in batches according to a preset addition plan; obtain the reaction condition parameters in the desulfurization reactor and the gas concentration of each sulfur-containing gas in the desulfurization reactor at each monitoring moment; At each monitoring moment, according to the amount of calcium-based desulfurizer already added and the gas concentration of each sulfur-containing gas, combined with the last amount of calcium-based desulfurizer added and the last time of addition, the desulfurization performance coefficient of the calcium-based desulfurizer is obtained, and according to the desulfurization performance coefficient, it is determined whether the next amount of calcium-based desulfurizer added needs to be adjusted; If adjustment is required, the activity coefficient of the calcium-based desulfurizer is obtained according to the reaction condition parameters of the desulfurization reactor at each monitoring moment, and the next dosage of the calcium-based desulfurizer is adjusted in combination with the desulfurization performance coefficient.

[0005] Furthermore, the method for obtaining the total delivery amount includes: Before desulfurization, the flue gas volume of the coke oven flue gas in the desulfurization reactor and the initial gas concentration of each sulfur-containing gas therein are obtained, and the total amount of the calcium-based desulfurizer added is calculated in combination with the molar mass of the calcium-based desulfurizer.

[0006] Furthermore, the preset delivery plan includes: The total amount of calcium-based desulfurizer added is evenly divided according to the preset number of times of addition, and added in batches at predetermined time intervals.

[0007] Furthermore, the method for obtaining the desulfurization performance coefficient includes: At each monitoring moment, a desired desulfurization effect parameter is obtained based on the difference between the amount of calcium-based desulfurizer added and the total amount of calcium-based desulfurizer added; an actual desulfurization effect parameter is obtained based on the difference between the gas concentration of each sulfur-containing gas and the initial gas concentration; and the difference between the desired desulfurization effect parameter and the actual desulfurization effect parameter is used as the initial desulfurization performance coefficient. Obtaining a performance interference parameter based on a time interval between each monitoring moment and a last time the calcium-based desulfurizer was added, and a difference between the last amount of the calcium-based desulfurizer added and the total amount of the calcium-based desulfurizer added; The performance interference parameter is subtracted from the initial desulfurization performance coefficient to obtain the desulfurization performance coefficient at the corresponding monitoring time.

[0008] Furthermore, the method for obtaining the actual desulfurization effect parameters includes: The concentration reduction rate of the gas concentration of each sulfur-containing gas relative to the initial gas concentration is used as the desulfurization effect sub-parameter at the perspective of each sulfur-containing gas; the cumulative sum of the desulfurization effect sub-parameters at the perspective of all sulfur-containing gases is used as the actual desulfurization effect parameter.

[0009] Furthermore, the method for obtaining the performance interference parameter includes: The time interval between each monitoring moment and the last time the calcium-based desulfurizer was added is normalized as the reaction weight, and the difference between the last amount of calcium-based desulfurizer added and the total amount of calcium-based desulfurizer added is weighted using the reaction weight, and the weighted result is used as the performance interference parameter.

[0010] Furthermore, the method for determining whether the next dosage of the calcium-based desulfurizer needs to be adjusted includes: When the desulfurization performance coefficient is within the preset desulfurization performance range, it is determined that no adjustment is required; when the desulfurization performance coefficient is not within the preset desulfurization performance range, it is determined that adjustment is required.

[0011] Furthermore, the reaction condition parameters include at least the reaction temperature, reaction humidity and oxygen concentration in the desulfurization reactor.

[0012] Furthermore, the method for obtaining the activity coefficient includes: A first activity parameter is obtained based on a deviation of the reaction temperature from a preset temperature, and a second activity parameter is obtained based on a deviation of the reaction humidity from a preset humidity. The first activity parameter, the second activity parameter, and the oxygen concentration are fused, and a normalized value of the fusion result is used as an activity coefficient.

[0013] Furthermore, the method for adjusting the next dosage of the calcium-based desulfurizer includes: When the desulfurization performance coefficient is greater than or equal to the upper limit of the preset desulfurization performance interval, the adjustment direction weight is set to -1; when the desulfurization performance coefficient is less than or equal to the lower limit of the preset desulfurization performance interval, the adjustment direction weight is set to 1; The maximum value between the desulfurization performance coefficient and the activity coefficient is used as the adjustment amplitude value, and the adjustment direction weight and the adjustment amplitude value are integrated to obtain the adjustment weight; the next dosage of the calcium-based desulfurizer is weighted using the adjustment weight, and the weighted result is used as the adjusted next dosage.

[0014] The present invention has the following beneficial effects: The present invention first obtains the total dosage of a calcium-based desulfurizer for coke oven flue gas desulfurization, and doses the calcium-based desulfurizer into a desulfurization reactor in batches according to a preset dosage plan; then, at each monitoring moment, the reaction condition parameters in the desulfurization reactor and the gas concentration of each sulfur-containing gas therein are obtained to prepare for subsequent analysis; further, at each monitoring moment, the desulfurization performance of the desulfurizer that has been dosed is analyzed based on the dosage of the calcium-based desulfurizer and the gas concentration of each sulfur-containing gas, and at the same time, combined with the last dosage and the last dosage moment of the calcium-based desulfurizer, the interference effect of the desulfurizer that has not fully participated in the reaction on the desulfurization performance is evaluated, thereby accurately obtaining the desulfurization performance coefficient of the calcium-based desulfurizer to determine whether the next dosage of the calcium-based desulfurizer needs to be adjusted; if adjustment is required, the activity coefficient of the calcium-based desulfurizer is obtained based on the reaction condition parameters of the desulfurization reactor at each monitoring moment, and the next dosage of the calcium-based desulfurizer is adjusted based on the desulfurization performance coefficient, and both the desulfurization performance coefficient and the activity coefficient provide a reference for adjusting the dosage according to the desulfurization reaction effect. The present invention dynamically regulates the addition of a calcium-based desulfurizer according to specific performances in the coke oven flue gas desulfurization process, such as desulfurization performance and reaction activity, thereby improving the desulfurization effect of the coke oven flue gas. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the technical solutions and advantages of the embodiments of the present invention or the prior art, the following briefly introduces the drawings required for use in the embodiments or the prior art descriptions. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0016] Figure 1A flow chart of a calcium-based desulfurization control method for a coke oven flue gas desulfurization reactor provided by one embodiment of the present invention; Figure 2 A flow chart of a method for obtaining a desulfurization performance coefficient provided by one embodiment of the present invention. DETAILED DESCRIPTION

[0017] To further illustrate the technical means and effectiveness of the present invention in achieving its intended purpose, the following, in conjunction with the accompanying drawings and preferred embodiments, describes in detail the specific implementation, structure, features, and effectiveness of a calcium-based desulfurization control method for a coke oven flue gas desulfurization reactor according to the present invention. In the following description, references to different "one embodiment" or "another embodiment" do not necessarily refer to the same embodiment. Furthermore, specific features, structures, or characteristics of one or more embodiments may be combined in any suitable manner.

[0018] Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs.

[0019] The specific scheme of the calcium-based desulfurization control method for a coke oven flue gas desulfurization reactor provided by the present invention is described in detail below with reference to the accompanying drawings.

[0020] See also Figure 1 , which shows a flow chart of a calcium-based desulfurization control method for a coke oven flue gas desulfurization reactor provided by one embodiment of the present invention, specifically comprising: Step S1, obtaining the total amount of calcium-based desulfurizer used for coke oven flue gas desulfurization, and adding the calcium-based desulfurizer to the desulfurization reactor in batches according to a preset addition plan; at each monitoring moment, obtaining the reaction condition parameters in the desulfurization reactor and the gas concentration of each sulfur-containing gas therein.

[0021] In one embodiment of the present invention, before performing calcium-based desulfurization control, it is first necessary to calculate the demand for calcium-based desulfurizer for coke oven flue gas desulfurization, that is, the total amount of calcium-based desulfurizer added to the desulfurization reactor; then set the addition plan of the calcium-based desulfurizer, and add the calcium-based desulfurizer to the desulfurization reactor in batches.

[0022] Considering that the sulfur-containing gases in coke oven flue gas mainly include sulfur dioxide , hydrogen sulfide and carbonyl sulfide etc., among which carbonyl sulfide It is a sulfur-containing organic compound that cannot be desulfurized by calcium-based desulfurizers. Therefore, certain pretreatment is required before desulfurization, such as dust removal and hydrolysis of organic sulfur into hydrogen sulfide. , which is convenient for subsequent desulfurization treatment; it should be noted that hydrolysis conversion is already an existing technical means and will not be described in detail.

[0023] So far, the sulfur-containing gases in coke oven flue gas mainly include sulfur dioxide and hydrogen sulfide The treated coke oven flue gas is passed into the desulfurization reactor and further desulfurized with a calcium-based desulfurizer.

[0024] Taking into account the total amount of flue gas in the desulfurization reactor and the concentration of each sulfur-containing gas, the volume of the sulfur-containing gas in the desulfurization reactor can be preliminarily estimated. Furthermore, based on the desulfurization reaction chemical formula of each sulfur-containing gas and the molar mass of each sulfur-containing gas and the calcium-based desulfurizer, the theoretical amount of calcium-based desulfurizer used for desulfurization, i.e. the total dosage, can be calculated to prepare for the dosage control of the calcium-based desulfurizer. Based on this, in a preferred embodiment of the present invention, the method for obtaining the total delivery amount includes: Before desulfurization, the flue gas volume of the coke oven flue gas in the desulfurization reactor and the initial gas concentration of each sulfur-containing gas therein are obtained, and the total dosage of the calcium-based desulfurizer is obtained in combination with the molar mass of the calcium-based desulfurizer.

[0025] As an example, first calculate the theoretical amount of calcium-based desulfurizer required for the desulfurization reaction of each sulfur-containing gas, and then add up the theoretical amounts of calcium-based desulfurizer required for all sulfur-containing gases to obtain the total dosage; Limestone Use calcium-based desulfurizer to remove sulfur dioxide in the desulfurization reactor For example, sulfur dioxide Limestone required for desulfurization reaction The calculation process of the theoretical amount of sulfur dioxide is as follows: first, The concentration of sulfur dioxide is multiplied by the flue gas volume, and then the product is divided by the molar volume of the gas under standard conditions 22.4L / mol to obtain The amount of substance n1; Based on the chemical reaction analysis of desulfurization, 1 mol of sulfur dioxide Requires 1 mol of limestone reaction, then theoretically sulfur dioxide can be removed Required limestone The amount of substance n2 should be equal to n1, and the required limestone The amount of substance n2 and limestone Multiply the molar mass of the required limestone to obtain quality; Based on the same steps, the mass of limestone required for each sulfur-containing gas can be calculated, and then the total mass of the required limestone can be accumulated. The total mass is then multiplied by a preset ratio, such as 1.3, to obtain the total amount of calcium-based desulfurizer added, that is, a certain margin is guaranteed to avoid incomplete desulfurization caused by other factors such as loss of addition. Implementers can also adjust the preset ratio on their own, but it should be ensured that it is greater than 1 and not too large.

[0026] It should be noted that the flue gas volume in the desulfurization reactor can be collected based on the built-in flow sensor to collect the flue gas flow at each moment, and then combined with the total inflow time of the flue gas to obtain; the gas concentration of each sulfur-containing gas in the desulfurization reactor can be collected based on the built-in concentration sensor, and collected and obtained before the desulfurization reaction begins; the above collection process is all existing technical means and will not be repeated here.

[0027] After obtaining the total amount of calcium-based desulfurizer required, the dosage plan can be further planned; considering that adding a large amount of calcium-based desulfurizer at one time is likely to cause deposition and scaling, it can be added in batches.

[0028] Preferably, in one embodiment of the present invention, the preset dosage scheme includes: dividing the total dosage of the calcium-based desulfurizer according to the preset number of dosages, and dosage in batches at a predetermined dosage time interval; wherein the predetermined dosage time interval is set to 30s, and then the total duration of the desulfurization reaction is evaluated, and then divided by the predetermined dosage time interval to determine the preset number of dosages; for example, if the evaluated total duration of the desulfurization reaction is 50 minutes and the calculated total dosage of the calcium-based desulfurizer is 100kg, then the preset number of dosages is 100 times, and the single dosage of the calcium-based desulfurizer is 1kg.

[0029] It should be noted that evaluating the total duration of the desulfurization reaction is an existing technical means well known to those skilled in the art and will not be described in detail. The implementer may also adjust the predetermined time interval according to actual conditions, thereby adjusting the preset delivery plan. In other embodiments, the implementer may also plan the delivery plan of the calcium-based desulfurizer in the form of an arithmetic descending order, which will not be described in detail.

[0030] After planning the calcium-based desulfurizer delivery plan, the implementer can use a nozzle to spray and other methods to deliver the agent. Furthermore, during the desulfurization reaction, the reaction condition parameters in the desulfurization reactor and the gas concentration of each sulfur-containing gas in it can be monitored to evaluate the reaction effect of the desulfurization reaction, and then dynamically adjust the delivery method of the calcium-based desulfurizer to improve the desulfurization effect.

[0031] In a preferred embodiment of the present invention, the reaction condition parameters include at least the reaction temperature, reaction humidity, and oxygen concentration in the desulfurization reactor. In other embodiments, the implementer may also add additional parameters such as the particle size of the calcium-based desulfurizer (which indirectly reflects the degree of mixing of substances during the reaction). The reaction condition parameters are collected using the temperature, humidity, and oxygen concentration sensors built into the desulfurization reactor, which are existing technical means and will not be further described.

[0032] In one embodiment of the present invention, after the desulfurization reaction starts, the gas concentration sensor built into the desulfurization reactor is used to synchronously collect the gas concentration of each sulfur-containing gas, wherein the collection frequency of all sensors is set to 30 seconds each time. The implementer can also adjust it by himself, but it is necessary to ensure that the collection frequency of all sensors is consistent.

[0033] Step S2, at each monitoring moment, according to the amount of calcium-based desulfurizer already added and the gas concentration of each sulfur-containing gas, combined with the last amount of calcium-based desulfurizer added and the last time of addition, obtain the desulfurization performance coefficient of the calcium-based desulfurizer, and determine whether the next amount of calcium-based desulfurizer added needs to be adjusted according to the desulfurization performance coefficient.

[0034] Considering that the concentration of sulfur-containing gases in the coke oven flue gas should gradually decrease as the calcium-based desulfurizer is continuously added to the desulfurization reactor, the concentration change of each sulfur-containing gas is analyzed at each monitoring moment in combination with the amount of calcium-based desulfurizer added. This can preliminarily evaluate the desulfurization effect of the coke oven flue gas and indirectly assess whether the addition of the calcium-based desulfurizer is reasonable. Considering that the calcium-based desulfurizer does not react completely immediately upon being added to the desulfurization reactor, some calcium-based desulfurizer may not react completely, affecting the accuracy of the desulfurization effect assessment. The time and amount of the last addition of the calcium-based desulfurizer can help assess the progress of the desulfurization reaction up to that monitoring time, and further help assess the interference with the desulfurization effect, thereby accurately evaluating the desulfurization performance at that monitoring time. Based on this, the embodiment of the present invention will obtain the desulfurization performance coefficient of the calcium-based desulfurizer at each monitoring moment according to the amount of calcium-based desulfurizer already added and the gas concentration of each sulfur-containing gas, combined with the last amount of calcium-based desulfurizer added and the last time of addition; the desulfurization performance coefficient reflects the desulfurization effect of the calcium-based desulfurizer at the monitoring moment, and prepares for the subsequent evaluation of whether to adjust the addition.

[0035] Preferably, in one embodiment of the present invention, the method for obtaining the desulfurization performance coefficient includes: See also Figure 2 , which shows a flow chart of a method for obtaining a desulfurization performance coefficient provided by an embodiment of the present invention, specifically comprising: Step S201, at each monitoring moment, obtain the expected desulfurization effect parameter based on the difference between the amount of calcium-based desulfurizer added and the total amount added; obtain the actual desulfurization effect parameter based on the difference between the gas concentration of each sulfur-containing gas and the initial gas concentration; and subtract the actual desulfurization effect parameter from the expected desulfurization effect parameter as the initial desulfurization performance coefficient.

[0036] Taking into account that the total input amount of calcium-based desulfurizer is estimated based on the amount of sulfur-containing gas in the coke oven flue gas, the concentration of sulfur-containing gas should also decrease accordingly after the corresponding amount of calcium-based desulfurizer is input; that is, the amount of calcium-based desulfurizer input corresponds to the expected desulfurization effect, and the change in the concentration of sulfur-containing gas reflects the actual desulfurization effect. By measuring the difference between the two, the desulfurization performance of the calcium-based desulfurizer that has been input at the monitoring moment can be evaluated, that is, the initial desulfurization performance coefficient.

[0037] In a preferred embodiment of the present invention, considering that there may be more than one type of sulfur-containing gas in the desulfurization reactor, all of which will consume the calcium-based desulfurizer, thereby causing the concentration of the sulfur-containing gas to decrease, the actual reaction effect of the added calcium-based desulfurizer can be evaluated by comprehensively considering the concentration reduction of all sulfur-containing gases. Based on this, the method for obtaining the actual desulfurization effect parameter includes: The concentration reduction rate of each sulfur-containing gas relative to the initial gas concentration is used as the desulfurization effect sub-parameter at the perspective of each sulfur-containing gas; the cumulative sum of the desulfurization effect sub-parameters at the perspective of all sulfur-containing gases is used as the actual desulfurization effect parameter.

[0038] As an example, at each monitoring moment, the amount of calcium-based desulfurizer added is used as the numerator, the total amount added is used as the denominator, and the fractional ratio is used as the expected desulfurization effect parameter; the difference between the initial gas concentration of each sulfur-containing gas and the gas concentration at the corresponding monitoring moment is used as the numerator, the initial gas concentration is used as the denominator, and the fractional ratio, that is, the concentration reduction rate, is used as the desulfurization effect sub-parameter from the perspective of the sulfur-containing gas, and then the actual desulfurization effect parameter in the desulfurization reactor is obtained; finally, the expected desulfurization effect parameter is subtracted from the actual desulfurization effect parameter to obtain the initial desulfurization performance coefficient.

[0039] Step S202 , obtaining a performance interference parameter based on the time interval between each monitoring moment and the last time the calcium-based desulfurizer was added, and the difference between the last amount of calcium-based desulfurizer added and the total amount of calcium-based desulfurizer added.

[0040] Considering that it takes a certain reaction time for the calcium-based desulfurizer to desulfurize the sulfur-containing gas after being added into the desulfurization reactor, each monitoring moment is not necessarily the moment when the added calcium-based desulfurizer is completely consumed. Therefore, the initial desulfurization performance coefficient estimated in the above step S201 may be affected to a certain extent and may be too large. Taking into account the time interval between the monitoring time and the last time the calcium-based desulfurizer was added, it roughly reflects the progress of the desulfurization reaction of the calcium-based desulfurizer, and the last amount of calcium-based desulfurizer added reflects to a certain extent the residual amount of calcium-based desulfurizer consumed at the monitoring time. The larger the last amount added, the greater the amount of calcium-based desulfurizer that has not reacted completely at the monitoring time, and the greater the interference effect on the desulfurization performance. Based on this, the performance interference parameter can be obtained according to the time interval between each monitoring moment and the last time the calcium-based desulfurizer was added, and the difference between the last amount of calcium-based desulfurizer added and the total amount added; the performance interference parameter estimates the amount of incomplete reaction of the calcium-based desulfurizer, and indirectly reflects the interference effect of incomplete reaction on the desulfurization performance, making preparations for the accurate evaluation of the desulfurization performance.

[0041] In a preferred embodiment of the present invention, the method for obtaining the performance interference parameter includes: The time interval between each monitoring moment and the last time the calcium-based desulfurizer was added was normalized and used as the reaction weight. The reaction weight was used to weight the difference between the last amount of calcium-based desulfurizer added and the total amount of calcium-based desulfurizer added, and the weighted result was used as the performance interference parameter.

[0042] As an example, the time interval is divided by the predetermined injection time interval for normalization, and then the ratio is used as the reaction weight; the last injection amount of the calcium-based desulfurizer is used as the numerator, the total injection amount is used as the denominator, and the fraction ratio is weighted using the reaction weight to obtain the performance interference parameter.

[0043] Step S203 : subtracting the performance interference parameter from the initial desulfurization performance coefficient to obtain the desulfurization performance coefficient at the corresponding monitoring time.

[0044] By subtracting the performance interference parameter from the initial desulfurization performance coefficient evaluated without considering whether the reaction is thorough, the desulfurization performance coefficient at the corresponding monitoring time can be accurately obtained. The closer the desulfurization performance coefficient is to 0, the more it indicates that as the calcium-based desulfurizer is consumed and converted, it corresponds to the decrease in the concentration of sulfur-containing gas. That is, the calcium-based desulfurizer that has been invested can be fully used for desulfurization, the possibility of over- or under-investment is low, and the desulfurization effect is better.

[0045] After obtaining the desulfurization performance coefficient at each monitoring moment, it can be determined whether the next dosage of calcium-based desulfurizer needs to be adjusted based on the desulfurization performance coefficient.

[0046] Preferably, in one embodiment of the present invention, the method for determining whether it is necessary to adjust the next dosage of the calcium-based desulfurizer includes: When the desulfurization performance coefficient is within the preset desulfurization performance range, it is determined that no adjustment is required; when the desulfurization performance coefficient is not within the preset desulfurization performance range, it is determined that adjustment is required.

[0047] As an example, considering that the closer the desulfurization performance coefficient is to 0, the better the desulfurization effect is, a preset desulfurization performance range is set. When the desulfurization performance coefficient is within the preset desulfurization performance range, it means that the dosing effect at the monitoring moment is good and there is no need to adjust the subsequent dosing plan; otherwise, adjustments are required to improve the desulfurization effect; In other examples, implementers may also adjust the desulfurization performance range on their own, but it should not deviate too much from 0.

[0048] Step S3: If adjustment is required, the activity coefficient of the calcium-based desulfurizer is obtained according to the reaction condition parameters of the desulfurization reactor at each monitoring moment, and the next dosage of the calcium-based desulfurizer is adjusted in combination with the desulfurization performance coefficient.

[0049] When it is determined that adjustment is necessary, the next dosage of the calcium-based desulfurizer can be analyzed and adjusted; considering that the reaction conditions in the desulfurization reactor at each monitoring moment, such as temperature, humidity or oxygen concentration, will also affect the desulfurization reaction rate, appropriate temperature and humidity will help promote the desulfurization reaction, and oxygen as an oxidant in the desulfurization reaction will accelerate the desulfurization process; based on this, the activity coefficient of the calcium-based desulfurizer can first be obtained according to the reaction condition parameters of the desulfurization reactor at each monitoring moment, where the activity coefficient simultaneously reflects the desulfurization effect of the desulfurization reaction at the corresponding monitoring moment, preparing for the subsequent adjustment of the dosage in combination with the desulfurization performance coefficient.

[0050] Preferably, in one embodiment of the present invention, when limestone is used for desulfurization, the optimal temperature in the desulfurization reactor is 750°C-900°C, and the desulfurization reaction rate is high within this temperature range; the optimal humidity is 40%-70%, and excessive humidity can easily cause excessive calcium hydroxide precipitation on the surface of the limestone, thereby affecting the activity; reduced oxygen consumption in the desulfurization reactor will affect the desulfurization effect; based on this, the activity at the monitoring time can be evaluated from the perspective of each parameter, and then the activity coefficient can be comprehensively obtained; the method for obtaining the activity coefficient includes: A first activity parameter is obtained based on the deviation of the reaction temperature from a preset temperature, and a second activity parameter is obtained based on the deviation of the reaction humidity from a preset humidity. The first activity parameter, the second activity parameter, and the oxygen concentration are fused, and a normalized value of the fusion result is used as the activity coefficient.

[0051] As an example, it is known that the optimal temperature is 750℃-900℃, and the optimal humidity is 40%-70%. The lowest values are taken respectively, that is, the preset temperature is set to 750℃, and the preset humidity is set to 40%; at each monitoring moment, the difference between the reaction temperature and the preset temperature is directly taken as the first activity parameter, and the difference between the reaction humidity and the preset humidity is taken as the second activity parameter; then the first activity parameter, the second activity parameter and the oxygen concentration are multiplied and fused, and the fusion result is linearly normalized to obtain the activity coefficient.

[0052] It should be noted that in other embodiments, the implementer may also take an intermediate value instead of the minimum value, or may evaluate the deviation of the reaction temperature or reaction humidity from the corresponding optimal range, or may combine the three using other methods such as addition or weighted summation.

[0053] It should be noted that the implementer can also issue an early warning when the reaction condition parameters, such as the reaction temperature, are not within the temperature range corresponding to the optimal temperature, or set the temperature control system to automatically adjust.

[0054] After obtaining the activity coefficient, the dosage of calcium-based desulfurizer can be further evaluated and adjusted.

[0055] Considering that when the desulfurization performance coefficient is less than or equal to -0.1, it means that the concentration reduction rate of sulfur-containing gas is faster than the consumption rate of calcium-based desulfurizer, and the amount of calcium-based desulfurizer added may be insufficient. The amount of calcium-based desulfurizer added can be appropriately increased to improve the desulfurization effect; and when the desulfurization performance coefficient is greater than or equal to 0.1, it means that the concentration reduction rate of sulfur-containing gas is slower than the consumption rate of calcium-based desulfurizer, and the amount of calcium-based desulfurizer added may be excessive. The amount of calcium-based desulfurizer added can be appropriately reduced to improve the desulfurization effect.

[0056] Preferably, in one embodiment of the present invention, the adjustment direction can be evaluated based on the desulfurization performance coefficient. When the desulfurization performance coefficient is less than or equal to the lower limit of the interval -0.1, the dosage of the calcium-based desulfurizer needs to be increased, and the adjustment direction weight can be set to 1. Similarly, the adjustment direction weight can be determined when the desulfurization performance coefficient is greater than or equal to the upper limit of the interval 0.1. Considering that both the activity coefficient and the desulfurization performance coefficient reflect the desulfurization reaction effect at the monitoring moment, the adjustment range of the calcium-based desulfurizer can be evaluated based on the values of the two, and the adjustment amount can be determined in combination with the adjustment direction. Based on this, the method for adjusting the next dosage of the calcium-based desulfurizer includes: When the desulfurization performance coefficient is greater than or equal to the upper limit of the preset desulfurization performance interval, the adjustment direction weight is set to -1; when the desulfurization performance coefficient is less than or equal to the lower limit of the preset desulfurization performance interval, the adjustment direction weight is set to 1; The maximum value between the desulfurization performance coefficient and the activity coefficient is used as the adjustment amplitude value, and the adjustment direction weight and the adjustment amplitude value are integrated to obtain the adjustment weight; the next dosage of the calcium-based desulfurizer is weighted using the adjustment weight, and the weighted result is used as the adjusted next dosage.

[0057] As an example, first determine the adjustment direction weight and the adjustment amplitude value, multiply the adjustment amplitude value with the adjustment direction weight to obtain the adjustment weight; then multiply the adjustment weight with the next dosage of the calcium-based desulfurizer, that is, the single dosage evaluated in step S1, to obtain the dosage of the calcium-based desulfurizer at the next adjacent dosage at the monitoring moment.

[0058] After obtaining the adjusted next dosage, the dosage can be controlled at the next dosage moment. This is already an existing technology and will not be described in detail. Repeat the above analysis process. At each monitoring moment during the desulfurization reaction, analyze and evaluate whether it is necessary to adjust the next dosage of the calcium-based desulfurizer and make adjustments until the reaction is completed or the dosage of the calcium-based desulfurizer is completed.

[0059] In one embodiment of the present invention, after the desulfurization reaction is completed, a sulfur-containing gas concentration sensor can be installed at the exhaust port of the desulfurization reactor to detect whether the desulfurization meets the standard, and then control the emission; when the monitoring does not meet the standard, secondary desulfurization is carried out until the desulfurization meets the standard; for by-products generated during the desulfurization process, such as calcium sulfate, it is necessary to regularly check and clean them after each emission to avoid scaling deposition.

[0060] In summary, the present invention first obtains the total amount of calcium-based desulfurizer used for coke oven flue gas desulfurization, and adds the calcium-based desulfurizer to the desulfurization reactor in batches according to a preset addition plan; then, at each monitoring moment, the reaction condition parameters in the desulfurization reactor and the gas concentration of each sulfur-containing gas therein are obtained, and further, based on the amount of calcium-based desulfurizer already added and the gas concentration of each sulfur-containing gas, combined with the last amount of calcium-based desulfurizer added and the last addition time, the desulfurization performance coefficient of the calcium-based desulfurizer is obtained to determine whether the next amount of calcium-based desulfurizer needs to be adjusted; if adjustment is required, the activity coefficient of the calcium-based desulfurizer is obtained according to the reaction condition parameters of the desulfurization reactor at each monitoring moment, and the next amount of calcium-based desulfurizer added is adjusted in combination with the desulfurization performance coefficient. The present invention dynamically regulates the addition of calcium-based desulfurizer according to the specific performance in the coke oven flue gas desulfurization process, such as desulfurization performance and reaction activity, to improve the desulfurization effect of coke oven flue gas.

[0061] It should be noted that the order in which the embodiments of the present invention are described above is for illustrative purposes only and does not necessarily represent the superiority or inferiority of the embodiments. The processes depicted in the accompanying drawings do not necessarily require the specific order or sequential order shown to achieve the desired results. In certain embodiments, multitasking and parallel processing are also possible or may be advantageous.

[0062] The various embodiments in this specification are described in a progressive manner, and the same or similar parts between the various embodiments can be referred to each other. Each embodiment focuses on the differences from other embodiments.

Claims

1. A calcium-based desulfurization control method for a coke oven flue gas desulfurization reactor, characterized in that: The method comprises: Obtain the total amount of calcium-based desulfurizer used for coke oven flue gas desulfurization, and add the calcium-based desulfurizer to the desulfurization reactor in batches according to a preset addition plan; obtain the reaction condition parameters in the desulfurization reactor and the gas concentration of each sulfur-containing gas in the desulfurization reactor at each monitoring moment; At each monitoring moment, according to the amount of calcium-based desulfurizer already added and the gas concentration of each sulfur-containing gas, combined with the last amount of calcium-based desulfurizer added and the last time of addition, the desulfurization performance coefficient of the calcium-based desulfurizer is obtained, and according to the desulfurization performance coefficient, it is determined whether the next amount of calcium-based desulfurizer added needs to be adjusted; If adjustment is required, the activity coefficient of the calcium-based desulfurizer is obtained according to the reaction condition parameters of the desulfurization reactor at each monitoring moment, and the next dosage of the calcium-based desulfurizer is adjusted in combination with the desulfurization performance coefficient.

2. The calcium-based desulfurization control method for a coke oven flue gas desulfurization reactor according to claim 1, characterized in that: The method for obtaining the total delivery amount includes: Before desulfurization, the flue gas volume of the coke oven flue gas in the desulfurization reactor and the initial gas concentration of each sulfur-containing gas therein are obtained, and the total amount of the calcium-based desulfurizer added is calculated in combination with the molar mass of the calcium-based desulfurizer.

3. The calcium-based desulfurization control method for a coke oven flue gas desulfurization reactor according to claim 1, characterized in that: The preset delivery plan includes: The total amount of calcium-based desulfurizer added is evenly divided according to the preset number of times of addition, and added in batches at predetermined time intervals.

4. The calcium-based desulfurization control method for a coke oven flue gas desulfurization reactor according to claim 2, characterized in that: The method for obtaining the desulfurization performance coefficient includes: At each monitoring moment, a desired desulfurization effect parameter is obtained based on the difference between the amount of calcium-based desulfurizer added and the total amount of calcium-based desulfurizer added; an actual desulfurization effect parameter is obtained based on the difference between the gas concentration of each sulfur-containing gas and the initial gas concentration; and the difference between the desired desulfurization effect parameter and the actual desulfurization effect parameter is used as the initial desulfurization performance coefficient. Obtaining a performance interference parameter based on a time interval between each monitoring moment and a last time the calcium-based desulfurizer was added, and a difference between the last amount of the calcium-based desulfurizer added and the total amount of the calcium-based desulfurizer added; The performance interference parameter is subtracted from the initial desulfurization performance coefficient to obtain the desulfurization performance coefficient at the corresponding monitoring time.

5. The calcium-based desulfurization control method for a coke oven flue gas desulfurization reactor according to claim 4, characterized in that: The method for obtaining the actual desulfurization effect parameters includes: The concentration reduction rate of the gas concentration of each sulfur-containing gas relative to the initial gas concentration is used as the desulfurization effect sub-parameter at the perspective of each sulfur-containing gas; the cumulative sum of the desulfurization effect sub-parameters at the perspective of all sulfur-containing gases is used as the actual desulfurization effect parameter.

6. The calcium-based desulfurization control method for a coke oven flue gas desulfurization reactor according to claim 4, characterized in that: The method for obtaining the performance interference parameter includes: The time interval between each monitoring moment and the last time the calcium-based desulfurizer was added is normalized as the reaction weight, and the difference between the last amount of calcium-based desulfurizer added and the total amount of calcium-based desulfurizer added is weighted using the reaction weight, and the weighted result is used as the performance interference parameter.

7. The calcium-based desulfurization control method for a coke oven flue gas desulfurization reactor according to claim 1, characterized in that: Methods for determining whether the next dosage of calcium-based desulfurizer needs to be adjusted include: When the desulfurization performance coefficient is within the preset desulfurization performance range, it is determined that no adjustment is required; when the desulfurization performance coefficient is not within the preset desulfurization performance range, it is determined that adjustment is required.

8. The calcium-based desulfurization control method for a coke oven flue gas desulfurization reactor according to claim 1, characterized in that: The reaction condition parameters include at least the reaction temperature, reaction humidity and oxygen concentration in the desulfurization reactor.

9. The calcium-based desulfurization control method for a coke oven flue gas desulfurization reactor according to claim 8, characterized in that: The method for obtaining the activity coefficient includes: A first activity parameter is obtained based on a deviation of the reaction temperature from a preset temperature, and a second activity parameter is obtained based on a deviation of the reaction humidity from a preset humidity. The first activity parameter, the second activity parameter, and the oxygen concentration are fused, and a normalized value of the fusion result is used as an activity coefficient.

10. The calcium-based desulfurization control method for a coke oven flue gas desulfurization reactor according to claim 7, characterized in that: Methods for adjusting the next dosage of calcium-based desulfurizer include: When the desulfurization performance coefficient is greater than or equal to the upper limit of the preset desulfurization performance interval, the adjustment direction weight is set to -1; when the desulfurization performance coefficient is less than or equal to the lower limit of the preset desulfurization performance interval, the adjustment direction weight is set to 1; The maximum value between the desulfurization performance coefficient and the activity coefficient is used as the adjustment amplitude value, and the adjustment direction weight and the adjustment amplitude value are integrated to obtain the adjustment weight; the next dosage of the calcium-based desulfurizer is weighted using the adjustment weight, and the weighted result is used as the adjusted next dosage.

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