WO2020052276A1 - Method and system for consumption reduction of oxidation air blowers in desulfurizing absorption tower - Google Patents

Method and system for consumption reduction of oxidation air blowers in desulfurizing absorption tower Download PDF

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WO2020052276A1
WO2020052276A1 PCT/CN2019/089239 CN2019089239W WO2020052276A1 WO 2020052276 A1 WO2020052276 A1 WO 2020052276A1 CN 2019089239 W CN2019089239 W CN 2019089239W WO 2020052276 A1 WO2020052276 A1 WO 2020052276A1
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calcium sulfite
concentration
absorption tower
desulfurization
deviation
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PCT/CN2019/089239
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French (fr)
Chinese (zh)
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刘煜
孙再连
梅瑜
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厦门邑通软件科技有限公司
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Publication of WO2020052276A1 publication Critical patent/WO2020052276A1/en

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    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
    • G05D7/00—Control of flow

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  • the invention relates to the field of energy saving and consumption reduction, in particular to a method and system for reducing consumption of an oxidation fan of a desulfurization absorption tower.
  • limestone-gypsum wet desulfurization process is the standard desulfurization process technology with the widest application range and the most mature process technology.
  • the limestone-gypsum wet desulfurization process is a type of wet desulfurization. It is the basic process of the current large-scale thermal power plant flue gas desulfurization. It uses inexpensive limestone or lime as a desulfurization absorbent. The limestone is crushed and ground into powder. It is mixed with water to form an absorption slurry.
  • the lime powder When lime is used as the absorbent, the lime powder is digested and added with water to make the absorbent slurry.
  • the absorption slurry In the absorption tower, the absorption slurry is mixed with the flue gas, and the sulfur dioxide in the flue gas is mixed with the slurry.
  • the calcium carbonate in the oxidized air is removed by chemical reaction, and the final reaction product is gypsum.
  • Oxygenation fans are used in the power plant to supply air to the slurry tank to solve the oxygen required for the reaction.
  • oxidation fans are generally required in power plants to supply air, which results in waste of electricity. This is mainly because the calcium sulfite concentration is not measured online. Go to the laboratory to get the calcium sulfite concentration, calculate the oxygen demand to guide the oxidizing wind demand, but the process of the test includes the sampling and drying process, which takes more than 4 hours, and even the second day can get the test results. It is basically impossible to effectively guide the operation of the oxidation fan.
  • the invention provides a method and a system for reducing the consumption of an oxidation fan of a desulfurization absorption tower, which are applied to a limestone-gypsum wet desulfurization process, can effectively guide the start, stop and air supply of each oxidation fan, and reasonably use each oxidation fan, thereby reducing Energy consumption.
  • the present invention provides a method for reducing the consumption of an oxidation fan of a desulfurization absorption tower, which includes the following steps:
  • S50 Use offline test data to iteratively correct the errors of the online meter.
  • the on-line meter of calcium sulfite concentration has certain errors.
  • the main sources of error are: the reaction of calcium sulfite to gypsum is reversible, which affects the total amount of calcium sulfite to be higher than the theoretical value; The total amount of calcium sulfate will decrease, which affects that the total amount of calcium sulfite is lower than the theoretical value.
  • These sources of error will affect the calculation of the total amount of calcium sulfite. Over time, the error will become larger and larger, affecting the availability of the calcium sulfite online instrument. Therefore, iterative correction of offline testing is required to ensure the calcium sulfite online instrument. Accuracy and availability, that is, after obtaining the calcium sulfite concentration through offline testing, the calcium sulfite online meter is adjusted accordingly.
  • step S10 includes:
  • S11 Establish a real-time calcium sulfite concentration tracking model.
  • the main attributes of the model include: total amount of calcium sulfite, the level of the absorption tower, the area of the bottom of the absorption tower, the total amount of original calcium sulfite, the increase of calcium sulfite, and calcium sulfite. Reduction, total calcium sulfite, current concentration of calcium sulfite, new wind demand, new desulfurization, new air volume.
  • the new desulfurization amount can be calculated from the SO2 inlet concentration, outlet concentration, and flue gas flow rate of the absorption tower; the added air volume, which is the cumulative amount of the oxidizing air flow of the oxidation fan.
  • step S50 includes:
  • S51 Calculate the concentration deviation and the total deviation according to the calcium sulfite concentration at the time, and compare the positive fitting calcium sulfite concentration online meter.
  • step S50 includes:
  • S53 Calculate the deviation adjustment coefficient according to the concentration deviation and the total deviation to improve the accuracy of the calcium sulfite concentration tracking model.
  • the error source is different or different, and the deviation adjustment coefficient is different. Only when the error source has not changed significantly or the error trend has a certain stability, the deviation adjustment coefficient will be fixed or acceptable. Fluctuations within a small range.
  • step S11 when using step S11 for the first time, there is no need to input the value of the total amount of the original calcium sulfite, and the value of the total amount of the original calcium sulfite is taken as one of the sources of error.
  • the concentration of the calcium sulfite must be high and a large amount of The amount of oxygen and oxidation fan's air supply can be increased appropriately.
  • the concentration of calcium sulfite collected by the online meter of calcium sulfite concentration is far from the true concentration, but due to the constant increase of calcium sulfite, the oxidation fan does not It will stop.
  • step S50 that is, after the first offline test, the error of the calcium sulfite concentration and the total amount of calcium sulfite at the time of the first offline test can be obtained, and the error can be corrected by itself. In the subsequent multiple offline tests, the errors that occurred later were continuously corrected.
  • the present invention provides a system for reducing consumption of an oxidation fan of a desulfurization absorption tower, which includes an on-line meter for calcium sulfite concentration, a control module, a data acquisition module, and an iterative correction module.
  • the calcium sulfite concentration online meter is used to calculate the calcium sulfite concentration and the total calcium sulfite;
  • the control module calculates the oxygen demand based on the calcium sulfite concentration and the total calcium sulfite, and then calculates the oxidizing wind demand based on the atmospheric oxygen content, and guides the start, stop and air supply of each oxidation fan;
  • the monitoring module includes a desulfurization monitoring module and an oxidation fan monitoring module.
  • the desulfurization monitoring module monitors the desulfurization process
  • the oxidation fan monitoring module monitors the operation status of the oxidation fan, and collects the calcium sulfite concentration. Statistic data.
  • Iterative correction module iteratively corrects errors of online instruments by using offline testing.
  • the iterative correction module retains the calcium sulfite concentration and the absorption tower liquid level value collected by the online meter at the offline test time point, and calculates the concentration deviation and the total deviation according to the current calcium sulfite concentration. , Correct fitting of calcium sulfite concentration online meter.
  • the iterative correction module calculates a deviation adjustment coefficient according to the concentration deviation and the total deviation, improves the accuracy of the calcium sulfite concentration tracking model, and refines based on the original deviation adjustment coefficient during the iterative correction process. Adjustment.
  • the concentration of calcium sulfite must be high and a large amount of oxygen is required.
  • the air supply of the oxidizing fan can be increased appropriately.
  • the concentration of calcium sulfite collected by the online meter of calcium sulphite concentration has a large deviation from the true concentration, but the oxidizing fan will not stop due to the constant increase of calcium sulphite.
  • step S50 that is, after the first offline test, the error of the calcium sulfite concentration and the total amount of calcium sulfite at the time of the first offline test can be obtained, and the error can be corrected by itself. During the multiple offline tests, errors in the later stages were continuously corrected.
  • the online meter operation method of calcium sulfite concentration is simple, effective, and low cost. There is no need to purchase expensive real-time calcium sulfite concentration detection instruments, which reduces the investment cost of the enterprise;
  • the online meter of calcium sulfite concentration passes the offline test and has the function of self-iterative correction to ensure the accuracy and availability of the online meter of calcium sulfite.
  • FIG. 1 is a working flowchart of a desulfurization absorption tower oxidation fan consumption reduction system according to the present invention.
  • Embodiment 1 The present invention provides a method for reducing the consumption of an oxidation fan of a desulfurization absorption tower, which is used in a limestone-gypsum wet desulfurization process, which can effectively guide the start, stop and air supply of each oxidation fan, and reasonably use each oxidation fan. Further reducing energy consumption includes the following steps:
  • S50 Use offline test data to iteratively correct the errors of the online meter.
  • the on-line meter of calcium sulfite concentration has certain errors.
  • the main sources of error are: the reaction of calcium sulfite to gypsum is reversible, which affects the total amount of calcium sulfite to be higher than the theoretical value; The total amount of calcium sulfate will decrease, which affects that the total amount of calcium sulfite is lower than the theoretical value.
  • These sources of error will affect the calculation of the total amount of calcium sulfite. Over time, the error will become larger and larger, affecting the availability of the calcium sulfite online instrument. Therefore, iterative correction of offline testing is required to ensure the calcium sulfite online instrument. Accuracy and availability, that is, after obtaining the calcium sulfite concentration through offline testing, the calcium sulfite online meter is adjusted accordingly.
  • Embodiment 2 A method for reducing consumption of an oxidation fan of a desulfurization absorption tower, including the following steps:
  • S11 Establish a real-time calcium sulfite concentration tracking model.
  • the main attributes of the model include: total amount of calcium sulfite, the level of the absorption tower, the area of the bottom of the absorption tower, the total amount of original calcium sulfite, the increase of calcium sulfite, and calcium sulfite. Reduction, total calcium sulfite, current concentration of calcium sulfite, new wind demand, new desulfurization, new air volume.
  • the new desulfurization amount can be calculated from the SO2 inlet concentration, outlet concentration, and flue gas flow rate of the absorption tower; the added air volume, which is the cumulative amount of the oxidizing air flow of the oxidation fan.
  • S50 Use offline test data to iteratively correct the errors of the online meter.
  • the on-line meter of calcium sulfite concentration has certain errors.
  • the main sources of error are: the reaction of calcium sulfite to gypsum is reversible, which affects the total amount of calcium sulfite to be higher than the theoretical value; The total amount of calcium sulfate will decrease, which affects that the total amount of calcium sulfite is lower than the theoretical value.
  • These sources of error will affect the calculation of the total amount of calcium sulfite. Over time, the error will become larger and larger, affecting the availability of the calcium sulfite online instrument. Therefore, iterative correction of offline testing is required to ensure the calcium sulfite online instrument. Accuracy and availability, that is, after obtaining the calcium sulfite concentration through offline testing, the calcium sulfite online meter is adjusted accordingly.
  • S51 Calculate the concentration deviation and the total deviation according to the calcium sulfite concentration at the time, and compare the positive fitting calcium sulfite concentration online meter.
  • S53 Calculate the deviation adjustment coefficient according to the concentration deviation and the total deviation to improve the accuracy of the calcium sulfite concentration tracking model.
  • the error source is different or different, and the deviation adjustment coefficient is different. Only when the error source has not changed significantly or the error trend has a certain stability, the deviation adjustment coefficient will be fixed or acceptable. Fluctuations within a small range.
  • step S11 when step S11 is used for the first time, it is not necessary to input the value of the total amount of the original calcium sulfite, or enter an estimated value, and use the value of the total amount of the original calcium sulfite as one of the sources of error.
  • the calcium concentration must be very high, and a large amount of oxygen is required.
  • the amount of air supplied by the oxidation fan can be appropriately increased.
  • the concentration of calcium sulfite collected by the online meter of calcium sulfite concentration has a large deviation from the true concentration. Increment of calcium sulfate, the oxidation fan will not stop.
  • step S50 the error of the calcium sulfite concentration and the total calcium sulfite at the first offline test time can be obtained. Size, correct the error on its own, and then in the subsequent multiple offline tests, continuously correct errors that occur later.
  • steps S10 to S54 are continuously looped, wherein the number of times of implementation of steps S50 to S54 can be appropriately reduced according to actual needs.
  • Embodiment 3 please refer to FIG. 1.
  • This embodiment provides a system for reducing consumption of an oxidation fan of a desulfurization absorption tower, which corresponds to the method provided in Embodiment 2, and includes an online meter for calcium sulfite concentration, a control module, a data acquisition module, Iterative correction module.
  • the calcium sulfite concentration online meter is used to calculate the calcium sulfite concentration and the total calcium sulfite.
  • the calcium sulfite concentration online meter has a real-time calcium sulfite concentration tracking model:
  • Calcium sulfite concentration (total amount of original calcium sulfite + 60/32 * new desulfurization amount-new air volume * 6% * 120/16) / (absorption tower bottom area * absorption tower liquid level value);
  • the additional desulfurization amount is calculated from the inlet SO2 inlet concentration, the outlet concentration, and the flue gas flow rate of the absorption tower; and the additional air volume is obtained from the accumulated oxidizing air flow of the oxidizing fan.
  • the monitoring module includes a desulfurization monitoring module and an oxidation fan monitoring module.
  • the desulfurization monitoring module monitors the desulfurization process and calculates the amount of desulfurization. Since the removed is converted from sulfur oxide to calcium sulfite, the calcium sulfite increase can be calculated; through oxidation
  • the control module calculates the oxygen demand based on the calcium sulfite concentration and the total calcium sulfite, and then calculates the oxidizing wind demand based on the atmospheric oxygen content, and guides the start, stop and air supply of each oxidation fan;
  • Iterative correction module iteratively corrects errors of online instruments by using offline testing.
  • Offline testing generally takes 4 to 30 hours from sampling to obtaining test results, so the system needs to retain the calcium sulfite concentration at the offline test time point.
  • the online calcium sulfite concentration and the absorption tower liquid level value collected by the instrument according to the time Calculate the concentration deviation and the total deviation of the calcium sulfite concentration, compare the positive fitting calcium sulfite concentration online meter.
  • the iterative correction module calculates the deviation adjustment coefficient according to the concentration deviation and the total deviation, improves the accuracy of the calcium sulphite concentration tracking model, and makes iterative adjustment based on the original deviation adjustment coefficient during the iterative correction process.
  • the concentration of the calcium sulfite must be It is very high and requires a large amount of oxygen.
  • the amount of air supplied by the oxidation fan can be appropriately increased.
  • the concentration of calcium sulfite collected by the online meter of the calcium sulfite concentration has a large deviation from the true concentration. The oxidation fan will not stop.
  • step S50 the error of the calcium sulfite concentration and the total amount of calcium sulfite at the first offline test time can be obtained. Correct the error, and then in the subsequent multiple offline tests, continuously correct errors that occur later.
  • the limestone-gypsum wet desulfurization process can make gypsum as a by-product.
  • Gypsum can be used in cement retarders, gypsum building products, model making, medical food additives, sulfuric acid production, paper fillers, paint fillers, etc., and can bring economic value to power plants.
  • the system provided by the invention has the function of guiding the optimal operation of the oxidation fan, can control and reduce the power consumption of the by-product gypsum production process, and has the function of energy saving and emission reduction.
  • the present invention has the following advantages:
  • the online meter operation method of calcium sulfite concentration is simple, effective, and low cost. There is no need to purchase expensive real-time calcium sulfite concentration detection instruments, which reduces the investment cost of the enterprise;
  • the online meter of calcium sulfite concentration passes the offline test and has the function of self-iterative correction to ensure the accuracy and availability of the online meter of calcium sulfite.

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Abstract

Disclosed are a method and a system for consumption reduction of oxidation air blowers in a desulfurizing absorption tower, which are applied to the limestone-gypsum wet desulfurization process. The method comprises the following steps: S10： fitting an in-line meter for the computation of calcium sulfite concentration; S20： calculating the total quantity of calcium sulfite according to the calcium sulfite concentration obtained from the in-line meter in combination with the base area and slurry liquid level of the slurry tank; S30： calculating the demand of oxygen quantity according to the total quantity of calcium sulfite, and calculating the demand of oxidized air quantity according to the 6% oxygen content in atmosphere; S40： directing the start-stop and air supply amount of respective oxidation air blowers according to the demand of oxidized air quantity; and S50： iteratively correcting errors of the in-line meter with the use of off-line test data. The method and the system have guidance functions for the start-stop of oxidation air blowers, overcome the existing defects in the traditional limestone-gypsum wet desulphurization process with stereotyped operation of oxidation air blowers and excessive supply of air volume, have the advantages of energy conservation and emission reduction, and reduce the investment cost of enterprises.

Description

一种脱硫吸收塔氧化风机降耗方法和***Method and system for reducing consumption of oxidation fan of desulfurization absorption tower 技术领域Technical field
本发明涉及节能降耗领域，尤其涉及一种脱硫吸收塔氧化风机降耗方法和***。The invention relates to the field of energy saving and consumption reduction, in particular to a method and system for reducing consumption of an oxidation fan of a desulfurization absorption tower.
背景技术Background technique
近些年来，随着电力事业的飞速发展，严格控制燃煤产生的污染物的排放成为电力事业发展的重要组成部分。火力发电厂锅炉尾部烟气中的二氧化硫排放量控制是治理大气污染物的重要一环，而石灰石-石膏湿法脱硫工艺是当前应用范围最广、工艺技术最成熟的标准脱硫工艺技术。石灰石-石膏湿法脱硫工艺是湿法脱硫的一种，是当前大机组火电厂烟气脱硫的基本工艺，它采用价廉易得的石灰石或石灰作脱硫吸收剂，石灰石经破碎磨细成粉状与水混合搅拌成吸收浆液，当采用石灰为吸收剂时，石灰粉经消化处理后加水制成吸收剂浆液；在吸收塔内，吸收浆液与烟气接触混合，烟气中的二氧化硫与浆液中的碳酸钙以及鼓入的氧化空气进行化学反应被脱除，最终反应产物为石膏。In recent years, with the rapid development of the electric power industry, strictly controlling the emission of pollutants from coal combustion has become an important part of the development of the electric power industry. The control of sulfur dioxide emissions in the tail gas of the boilers of thermal power plants is an important part of the treatment of atmospheric pollutants, and the limestone-gypsum wet desulfurization process is the standard desulfurization process technology with the widest application range and the most mature process technology. The limestone-gypsum wet desulfurization process is a type of wet desulfurization. It is the basic process of the current large-scale thermal power plant flue gas desulfurization. It uses inexpensive limestone or lime as a desulfurization absorbent. The limestone is crushed and ground into powder. It is mixed with water to form an absorption slurry. When lime is used as the absorbent, the lime powder is digested and added with water to make the absorbent slurry. In the absorption tower, the absorption slurry is mixed with the flue gas, and the sulfur dioxide in the flue gas is mixed with the slurry. The calcium carbonate in the oxidized air is removed by chemical reaction, and the final reaction product is gypsum.
电厂是使用氧化风机为浆液池送风来解决反应所需的氧，实际操作中，电厂普遍存在氧化风机超需要供风，造成电力浪费，主要是因为亚硫酸钙浓度没有在线测点，需要线下化验室化验获取亚硫酸钙浓度，计算氧需求量，以指导氧化风需求量，但化验的流程包括采样和烘干过程，耗时在4小时以上，甚至要第2天才能获得化验结果，基本无法实现有效指导氧化风机的操作。Oxygenation fans are used in the power plant to supply air to the slurry tank to solve the oxygen required for the reaction. In actual operation, oxidation fans are generally required in power plants to supply air, which results in waste of electricity. This is mainly because the calcium sulfite concentration is not measured online. Go to the laboratory to get the calcium sulfite concentration, calculate the oxygen demand to guide the oxidizing wind demand, but the process of the test includes the sampling and drying process, which takes more than 4 hours, and even the second day can get the test results. It is basically impossible to effectively guide the operation of the oxidation fan.
发明内容Summary of the Invention
本发明提供了一种脱硫吸收塔氧化风机降耗方法和***，应用于石灰石-石膏湿法脱硫工艺中，能够有效指导各氧化风机的启停和送风量，合理使用各氧化风机，进而降低能耗。The invention provides a method and a system for reducing the consumption of an oxidation fan of a desulfurization absorption tower, which are applied to a limestone-gypsum wet desulfurization process, can effectively guide the start, stop and air supply of each oxidation fan, and reasonably use each oxidation fan, thereby reducing Energy consumption.
针对现有技术的缺陷，本发明提供了一种脱硫吸收塔氧化风机降耗方法，包括如下步骤：In view of the defects of the prior art, the present invention provides a method for reducing the consumption of an oxidation fan of a desulfurization absorption tower, which includes the following steps:
S10：拟合亚硫酸钙浓度在线仪表，用于在线计算亚硫酸钙浓度；S10: Fit on-line meter of calcium sulfite concentration for online calculation of calcium sulfite concentration;
S20：依据亚硫酸钙浓度在线仪表得到的亚硫酸钙浓度，结合浆液池的底面积和浆液液面高度，计算亚硫酸钙总量，亚硫酸钙总量＝亚硫酸钙浓度*底面积*液位；S20: Calculate the total amount of calcium sulfite based on the concentration of calcium sulfite obtained from the online meter of the calcium sulfite concentration combined with the bottom area of the slurry tank and the height of the slurry liquid surface. Total calcium sulfite = calcium sulfite concentration * bottom area * liquid Bit
S30：根据亚硫酸钙总量，计算氧需求量，再根据大气含氧量为6％，计算氧化风需求量；S30: Calculate the oxygen demand based on the total calcium sulfite, and then calculate the oxidizing wind demand based on the atmospheric oxygen content of 6%;
S40：根据氧化风需求量，指导各氧化风机的启停和送风量，合理启用氧化风机的数量和档数的选择，尽量控制到输送的风量大于或略大于所需的送风量，降低能耗；S40: Guide the start, stop, and supply of each oxidizing fan according to the demand of oxidizing wind, and reasonably select the number and number of gears of the oxidizing fan, and try to control the delivered air volume to be greater than or slightly larger than the required air supply volume and reduce Energy consumption
S50：利用线下化验数据，迭代校正在线仪表的误差。亚硫酸钙浓度在线仪表具有一定的误差，其误差来源主要是：亚硫酸钙氧化为石膏的反应是可逆的，这影响到亚硫酸钙的总量 比理论值要高些；排出石膏时，亚硫酸钙总量会有所减少，这影响到亚硫酸钙的总量比理论值要低些。这些误差源将影响到亚硫酸钙总量的计算，长时间累计可使误差越来越大，影响亚硫酸钙在线仪表的可用性，因此需要线下化验的迭代纠偏，保证亚硫酸钙在线仪表的准确性和可用性，即通过线下化验获取亚硫酸钙浓度后，对亚硫酸钙在线仪表进行相应的调整。S50: Use offline test data to iteratively correct the errors of the online meter. The on-line meter of calcium sulfite concentration has certain errors. The main sources of error are: the reaction of calcium sulfite to gypsum is reversible, which affects the total amount of calcium sulfite to be higher than the theoretical value; The total amount of calcium sulfate will decrease, which affects that the total amount of calcium sulfite is lower than the theoretical value. These sources of error will affect the calculation of the total amount of calcium sulfite. Over time, the error will become larger and larger, affecting the availability of the calcium sulfite online instrument. Therefore, iterative correction of offline testing is required to ensure the calcium sulfite online instrument. Accuracy and availability, that is, after obtaining the calcium sulfite concentration through offline testing, the calcium sulfite online meter is adjusted accordingly.
可选的，所述步骤S10包括：Optionally, the step S10 includes:
S11：建立实时的亚硫酸钙浓度跟踪模型，模型主要属性包括：亚硫酸钙总量、吸收塔液位值、吸收塔底面积、原始亚硫酸钙总量、亚硫酸钙增量、亚硫酸钙减少量、亚硫酸钙总量、亚硫酸钙当前浓度、新增风需求量、新增脱硫量、新增风量。S11: Establish a real-time calcium sulfite concentration tracking model. The main attributes of the model include: total amount of calcium sulfite, the level of the absorption tower, the area of the bottom of the absorption tower, the total amount of original calcium sulfite, the increase of calcium sulfite, and calcium sulfite. Reduction, total calcium sulfite, current concentration of calcium sulfite, new wind demand, new desulfurization, new air volume.
各属性间的化学反应公式和计算公式如下：The chemical reaction formula and calculation formula between the attributes are as follows:
1、由SO 2(二氧化硫32)+Ca(OH) 2(石灰浆液38)＝CaSO 3(亚硫酸钙60)+H 2O(水10)， 1. From SO 2 (sulfur dioxide 32) + Ca (OH) 2 (lime slurry 38) = CaSO 3 (calcium sulfite 60) + H 2 O (water 10),
可得，亚硫酸钙增量＝60/32*新增脱硫量。Available, calcium sulfite increase = 60/32 * additional desulfurization.
2、由2 CaSO 3(亚硫酸钙120)+O 2(氧16)＝2 CaSO 4(硫酸钙136)， 2. From 2 CaSO 3 (calcium sulfite 120) + O 2 (oxygen 16) = 2 CaSO 4 (calcium sulfate 136),
可得，新增风需求量＝亚硫酸钙增量*16/120/6％，Available, new wind demand = calcium sulfite increase * 16/120/6%,
同理：亚硫酸钙减量＝新增风量*6％*120/16。The same reason: calcium sulfite reduction = new air volume * 6% * 120/16.
3、亚硫酸钙总量3.Total calcium sulfite
＝原始亚硫酸钙总量+亚硫酸钙增量–亚硫酸钙减量= Total raw calcium sulfite + calcium sulfite increase – calcium sulfite decrease
＝原始亚硫酸钙总量+60/32*新增脱硫量–新增风量*6％*120/16= Total amount of original calcium sulfite + 60/32 * New desulfurization volume-New air volume * 6% * 120/16
＝亚硫酸钙浓度*底面积*液位= Calcium sulfite concentration * bottom area * liquid level
可得，Available,
原始亚硫酸钙总量Total raw calcium sulfite
＝亚硫酸钙浓度*底面积*液位-60/32*新增脱硫量+新增风量*6％*120/16亚硫酸钙浓度；= Calcium sulfite concentration * bottom area * liquid level -60/32 * new desulfurization amount + new air volume * 6% * 120/16 calcium sulfite concentration;
＝(原始亚硫酸钙总量+60/32*新增脱硫量–新增风量*6％*120/16)/(吸收塔底面积*吸收塔液位值)。= (Total original calcium sulfite + 60/32 * new desulfurization volume-new air volume * 6% * 120/16) / (absorption tower bottom area * absorption tower liquid level value).
其中，新增脱硫量可由吸收塔SO2入口浓度、出口浓度、烟气流量计算得出；新增风量，也就是氧化风机的氧化风流量的累计得出。Among them, the new desulfurization amount can be calculated from the SO2 inlet concentration, outlet concentration, and flue gas flow rate of the absorption tower; the added air volume, which is the cumulative amount of the oxidizing air flow of the oxidation fan.
可选的，步骤S50包括：Optionally, step S50 includes:
S51：保留线下化验时间点相关参数，所述参数包括亚硫酸钙浓度在线仪表采集到的亚硫酸钙浓度和吸收塔液位值；S51: Retain relevant parameters of the offline test time point, the parameters including the calcium sulfite concentration and the absorption tower liquid level value collected by the online meter;
S51：根据当时的亚硫酸钙浓度计算浓度偏差和总量偏差，较正拟合的亚硫酸钙浓度在线仪表。S51: Calculate the concentration deviation and the total deviation according to the calcium sulfite concentration at the time, and compare the positive fitting calcium sulfite concentration online meter.
可选的，所述步骤S50包括：Optionally, the step S50 includes:
S53：根据浓度偏差和总量偏差，计算偏差调整系数，改进亚硫酸钙浓度跟踪模型的精确性。对于不同的工况，其误差源不同或者存在区别，偏差调整系数就不相同，只有当误差源没有发生明显改变或者误差趋势具有一定的稳定性时，偏差调整系数才会固定下来或者在可接受的小范围内波动。S53: Calculate the deviation adjustment coefficient according to the concentration deviation and the total deviation to improve the accuracy of the calcium sulfite concentration tracking model. For different working conditions, the error source is different or different, and the deviation adjustment coefficient is different. Only when the error source has not changed significantly or the error trend has a certain stability, the deviation adjustment coefficient will be fixed or acceptable. Fluctuations within a small range.
S54：迭代纠偏，在原偏差调整系数的基础上做微细化调整，即通过不断的微调偏差调整系数，使得亚硫酸钙浓度跟踪模型更加准确，亚硫酸钙浓度在线仪表采集到的亚硫酸钙浓度才会更加贴近真实。S54: Iterative correction, based on the original deviation adjustment coefficient, making fine adjustments, that is, by continuously fine-tuning the deviation adjustment coefficient, the calcium sulphite concentration tracking model is more accurate. The calcium sulphite concentration collected by the online meter Will be closer to reality.
可选的，第一次使用步骤S11时，无需输入原始亚硫酸钙总量的值，将原始亚硫酸钙总量的值当成误差来源之一，此时亚硫酸钙浓度必定很高，需要大量的氧气，氧化风机的送风量可适当调高，此时亚硫酸钙浓度在线仪表采集到的亚硫酸钙浓度与真实浓度存在较大偏差，但是由于一直存在亚硫酸钙增量，氧化风机不会停止，在步骤S50迭代校正中，即经过第一次线下化验，就能得到第一次线下化验时刻的亚硫酸钙浓度和亚硫酸钙总量的误差大小，自行纠正该误差，然后在后续的多次线下化验过程中，不断的纠正后期出现的误差。Optionally, when using step S11 for the first time, there is no need to input the value of the total amount of the original calcium sulfite, and the value of the total amount of the original calcium sulfite is taken as one of the sources of error. At this time, the concentration of the calcium sulfite must be high and a large amount of The amount of oxygen and oxidation fan's air supply can be increased appropriately. At this time, the concentration of calcium sulfite collected by the online meter of calcium sulfite concentration is far from the true concentration, but due to the constant increase of calcium sulfite, the oxidation fan does not It will stop. In the iterative correction of step S50, that is, after the first offline test, the error of the calcium sulfite concentration and the total amount of calcium sulfite at the time of the first offline test can be obtained, and the error can be corrected by itself. In the subsequent multiple offline tests, the errors that occurred later were continuously corrected.
针对现有技术的缺陷，本发明提供了一种脱硫吸收塔氧化风机降耗***，包括亚硫酸钙浓度在线仪表、控制模块、数据采集模块、迭代纠偏模块。In view of the shortcomings of the prior art, the present invention provides a system for reducing consumption of an oxidation fan of a desulfurization absorption tower, which includes an on-line meter for calcium sulfite concentration, a control module, a data acquisition module, and an iterative correction module.
其中，亚硫酸钙浓度在线仪表，用于计算亚硫酸钙浓度和亚硫酸钙总量；Among them, the calcium sulfite concentration online meter is used to calculate the calcium sulfite concentration and the total calcium sulfite;
控制模块，根据亚硫酸钙浓度和亚硫酸钙总量，计算氧需求量，再根据大气含氧量，计算氧化风需求量，并指导各氧化风机的启停和送风量；The control module calculates the oxygen demand based on the calcium sulfite concentration and the total calcium sulfite, and then calculates the oxidizing wind demand based on the atmospheric oxygen content, and guides the start, stop and air supply of each oxidation fan;
监控模块，包括脱硫监控模块和氧化风机监控模块，通过脱硫监控模块监控脱硫过程，通过氧化风机监控模块监控氧化风机运行状况，并采集亚硫酸钙浓度在线仪表计算亚硫酸钙浓度时所需的工况数据。The monitoring module includes a desulfurization monitoring module and an oxidation fan monitoring module. The desulfurization monitoring module monitors the desulfurization process, the oxidation fan monitoring module monitors the operation status of the oxidation fan, and collects the calcium sulfite concentration. Statistic data.
迭代纠偏模块，利用线下化验迭代校正在线仪表的误差。Iterative correction module, iteratively corrects errors of online instruments by using offline testing.
可选的，所述亚硫酸钙浓度在线仪表包括实时的亚硫酸钙浓度跟踪模型：亚硫酸钙浓度＝(原始亚硫酸钙总量+60/32*新增脱硫量–新增风量*6％*120/16)/(吸收塔底面积*吸收塔液位值)；所述新增脱硫量由吸收塔SO2入口浓度、出口浓度、烟气流量计算得出；所述新增风量由氧化风机的氧化风流量的累计得出。Optionally, the online meter of calcium sulfite concentration includes a real-time calcium sulfite concentration tracking model: calcium sulfite concentration = (total amount of original calcium sulfite + 60/32 * new desulfurization amount-new air volume * 6% * 120/16) / (the area of the bottom of the absorption tower * the liquid level of the absorption tower); the new desulfurization amount is calculated from the inlet SO2 inlet concentration, outlet concentration, and flue gas flow of the absorption tower; the additional air volume is from an oxidation fan The accumulated oxidizing air flow is obtained.
可选的，所述迭代纠偏模块保留线下化验时间点的亚硫酸钙浓度在线仪表采集到的亚硫酸钙浓度和吸收塔液位值，根据当时的亚硫酸钙浓度计算浓度偏差和总量偏差，较正拟合的亚硫酸钙浓度在线仪表。Optionally, the iterative correction module retains the calcium sulfite concentration and the absorption tower liquid level value collected by the online meter at the offline test time point, and calculates the concentration deviation and the total deviation according to the current calcium sulfite concentration. , Correct fitting of calcium sulfite concentration online meter.
可选的，所述迭代纠偏模块根据浓度偏差和总量偏差，计算偏差调整系数，改进亚硫酸 钙浓度跟踪模型的精确性，并在迭代纠偏过程中，在原偏差调整系数的基础上做微细化调整。Optionally, the iterative correction module calculates a deviation adjustment coefficient according to the concentration deviation and the total deviation, improves the accuracy of the calcium sulfite concentration tracking model, and refines based on the original deviation adjustment coefficient during the iterative correction process. Adjustment.
可选的，***第一次时，无需输入原始亚硫酸钙总量的值，将原始亚硫酸钙总量的值当成误差来源之一，此时亚硫酸钙浓度必定很高，需要大量的氧气，氧化风机的送风量可适当调高，此时亚硫酸钙浓度在线仪表采集到的亚硫酸钙浓度与真实浓度存在较大偏差，但是由于一直存在亚硫酸钙增量，氧化风机不会停止，在步骤S50迭代校正中，即经过第一次线下化验，就能得到第一次线下化验时刻的亚硫酸钙浓度和亚硫酸钙总量的误差大小，自行纠正该误差，然后在后续的多次线下化验过程中，不断的纠正后期出现的误差。Optionally, when the system is used for the first time, there is no need to enter the value of the total amount of original calcium sulfite, and the value of the total amount of original calcium sulfite is taken as one of the sources of error. At this time, the concentration of calcium sulfite must be high and a large amount of oxygen is required. The air supply of the oxidizing fan can be increased appropriately. At this time, the concentration of calcium sulfite collected by the online meter of calcium sulphite concentration has a large deviation from the true concentration, but the oxidizing fan will not stop due to the constant increase of calcium sulphite. In the iterative correction of step S50, that is, after the first offline test, the error of the calcium sulfite concentration and the total amount of calcium sulfite at the time of the first offline test can be obtained, and the error can be corrected by itself. During the multiple offline tests, errors in the later stages were continuously corrected.
由上述对本发明的描述可知，和现有技术相比，本发明提出的一种脱硫吸收塔氧化风机降耗方法和***具有如下优点：It can be known from the foregoing description of the present invention that, compared with the prior art, a method and system for reducing consumption of an oxidation fan for a desulfurization absorption tower provided by the present invention have the following advantages:
1、对氧化风机的启停具有指导作用，克服传统石灰石-石膏湿法脱硫工艺中，氧化风机的操作单一，提供风量过多的缺陷，具有节能减排的优点；1. It has a guiding effect on the start and stop of the oxidation fan, and overcomes the single operation of the oxidation fan in the traditional limestone-gypsum wet desulfurization process, which provides the disadvantage of excessive air volume and has the advantages of energy saving and emission reduction;
2、采用亚硫酸钙浓度在线仪表实时采集亚硫酸钙浓度信息，克服线下化验时间长，反应不及时的缺陷；2. Use calcium sulfite concentration on-line instrument to collect calcium sulfite concentration information in real time to overcome the disadvantages of long offline testing and untimely response;
3、亚硫酸钙浓度在线仪表运行方式简单，有效，成本低，无需采购昂贵的亚硫酸钙实时浓度检测仪器，减少了企业投入成本；3. The online meter operation method of calcium sulfite concentration is simple, effective, and low cost. There is no need to purchase expensive real-time calcium sulfite concentration detection instruments, which reduces the investment cost of the enterprise;
4、亚硫酸钙浓度在线仪表通过线下化验，具有自我迭代校正的功能，保证亚硫酸钙在线仪表的准确性和可用性。4. The online meter of calcium sulfite concentration passes the offline test and has the function of self-iterative correction to ensure the accuracy and availability of the online meter of calcium sulfite.
附图说明BRIEF DESCRIPTION OF THE DRAWINGS
此处所说明的附图用来提供对本发明的进一步理解，构成本发明的一部分，本发明的示意性实施例及其说明用于解释本发明，并不构成对本发明的不当限定。The drawings described herein are used to provide a further understanding of the present invention and constitute a part of the present invention. The schematic embodiments of the present invention and the descriptions thereof are used to explain the present invention, and do not constitute an improper limitation on the present invention.
其中：among them:
图1是本发明一种脱硫吸收塔氧化风机降耗***工作流程图。FIG. 1 is a working flowchart of a desulfurization absorption tower oxidation fan consumption reduction system according to the present invention.
具体实施方式detailed description
为了使本发明所要解决的技术问题、技术方案及有益效果更加清楚、明白，以下结合附图和实施例，对本发明进行进一步详细说明。应当理解，此处所描述的具体实施例仅用以解释本发明，并不用于限定本发明。In order to make the technical problems, technical solutions and beneficial effects to be more clearly understood by the present invention, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.
实施例一：本发明提供了一种脱硫吸收塔氧化风机降耗方法，应用于石灰石-石膏湿法脱硫工艺中，能够有效指导各氧化风机的启停和送风量，合理使用各氧化风机，进而降低能耗，包括如下步骤：Embodiment 1: The present invention provides a method for reducing the consumption of an oxidation fan of a desulfurization absorption tower, which is used in a limestone-gypsum wet desulfurization process, which can effectively guide the start, stop and air supply of each oxidation fan, and reasonably use each oxidation fan. Further reducing energy consumption includes the following steps:
S10：拟合亚硫酸钙浓度在线仪表，用于在线计算亚硫酸钙浓度；S10: Fit on-line meter of calcium sulfite concentration for online calculation of calcium sulfite concentration;
S20：依据亚硫酸钙浓度在线仪表得到的亚硫酸钙浓度，结合浆液池的底面积和浆液液面 高度，计算亚硫酸钙总量，亚硫酸钙总量＝亚硫酸钙浓度*底面积*液位；S20: Calculate the total amount of calcium sulfite based on the concentration of calcium sulfite obtained from the online meter of the calcium sulfite concentration combined with the bottom area of the slurry tank and the height of the slurry liquid surface. Total calcium sulfite = calcium sulfite concentration * bottom area * liquid Bit
S30：根据亚硫酸钙总量，计算氧需求量，再根据大气含氧量为6％，计算氧化风需求量；S30: Calculate the oxygen demand based on the total calcium sulfite, and then calculate the oxidizing wind demand based on the atmospheric oxygen content of 6%;
S40：根据氧化风需求量，指导各氧化风机的启停和送风量，合理启用氧化风机的数量和档数的选择，尽量控制到输送的风量大于或略大于所需的送风量，降低能耗；S40: Guide the start, stop, and supply of each oxidizing fan according to the demand of oxidizing wind, and reasonably select the number and number of gears of the oxidizing fan, and try to control the delivered air volume to be greater than or slightly larger than the required air supply volume and reduce Energy consumption
S50：利用线下化验数据，迭代校正在线仪表的误差。亚硫酸钙浓度在线仪表具有一定的误差，其误差来源主要是：亚硫酸钙氧化为石膏的反应是可逆的，这影响到亚硫酸钙的总量比理论值要高些；排出石膏时，亚硫酸钙总量会有所减少，这影响到亚硫酸钙的总量比理论值要低些。这些误差源将影响到亚硫酸钙总量的计算，长时间累计可使误差越来越大，影响亚硫酸钙在线仪表的可用性，因此需要线下化验的迭代纠偏，保证亚硫酸钙在线仪表的准确性和可用性，即通过线下化验获取亚硫酸钙浓度后，对亚硫酸钙在线仪表进行相应的调整。S50: Use offline test data to iteratively correct the errors of the online meter. The on-line meter of calcium sulfite concentration has certain errors. The main sources of error are: the reaction of calcium sulfite to gypsum is reversible, which affects the total amount of calcium sulfite to be higher than the theoretical value; The total amount of calcium sulfate will decrease, which affects that the total amount of calcium sulfite is lower than the theoretical value. These sources of error will affect the calculation of the total amount of calcium sulfite. Over time, the error will become larger and larger, affecting the availability of the calcium sulfite online instrument. Therefore, iterative correction of offline testing is required to ensure the calcium sulfite online instrument. Accuracy and availability, that is, after obtaining the calcium sulfite concentration through offline testing, the calcium sulfite online meter is adjusted accordingly.
实施例二：一种脱硫吸收塔氧化风机降耗方法，包括如下步骤：Embodiment 2: A method for reducing consumption of an oxidation fan of a desulfurization absorption tower, including the following steps:
S10：拟合亚硫酸钙浓度在线仪表，用于在线计算亚硫酸钙浓度；S10: Fit on-line meter of calcium sulfite concentration for online calculation of calcium sulfite concentration;
S11：建立实时的亚硫酸钙浓度跟踪模型，模型主要属性包括：亚硫酸钙总量、吸收塔液位值、吸收塔底面积、原始亚硫酸钙总量、亚硫酸钙增量、亚硫酸钙减少量、亚硫酸钙总量、亚硫酸钙当前浓度、新增风需求量、新增脱硫量、新增风量。S11: Establish a real-time calcium sulfite concentration tracking model. The main attributes of the model include: total amount of calcium sulfite, the level of the absorption tower, the area of the bottom of the absorption tower, the total amount of original calcium sulfite, the increase of calcium sulfite, and calcium sulfite. Reduction, total calcium sulfite, current concentration of calcium sulfite, new wind demand, new desulfurization, new air volume.
各属性间的化学反应公式和计算公式如下：The chemical reaction formula and calculation formula between the attributes are as follows:
1、由SO 2(二氧化硫32)+Ca(OH) 2(石灰浆液38)＝CaSO 3(亚硫酸钙60)+H 2O(水10)， 1. From SO 2 (sulfur dioxide 32) + Ca (OH) 2 (lime slurry 38) = CaSO 3 (calcium sulfite 60) + H 2 O (water 10),
可得，亚硫酸钙增量＝60/32*新增脱硫量。Available, calcium sulfite increase = 60/32 * additional desulfurization.
2、由2 CaSO 3(亚硫酸钙120)+O 2(氧16)＝2 CaSO 4(硫酸钙136)， 2. From 2 CaSO 3 (calcium sulfite 120) + O 2 (oxygen 16) = 2 CaSO 4 (calcium sulfate 136),
可得，新增风需求量＝亚硫酸钙增量*16/120/6％，Available, new wind demand = calcium sulfite increase * 16/120/6%,
同理：亚硫酸钙减量＝新增风量*6％*120/16。The same reason: calcium sulfite reduction = new air volume * 6% * 120/16.
3、亚硫酸钙总量3.Total calcium sulfite
＝原始亚硫酸钙总量+亚硫酸钙增量–亚硫酸钙减量= Total raw calcium sulfite + calcium sulfite increase – calcium sulfite decrease
＝原始亚硫酸钙总量+60/32*新增脱硫量–新增风量*6％*120/16= Total amount of original calcium sulfite + 60/32 * New desulfurization volume-New air volume * 6% * 120/16
＝亚硫酸钙浓度*底面积*液位= Calcium sulfite concentration * bottom area * liquid level
可得，Available,
原始亚硫酸钙总量Total raw calcium sulfite
＝亚硫酸钙浓度*底面积*液位-60/32*新增脱硫量+新增风量*6％*120/16亚硫酸钙浓度；= Calcium sulfite concentration * bottom area * liquid level -60/32 * new desulfurization amount + new air volume * 6% * 120/16 calcium sulfite concentration;
＝(原始亚硫酸钙总量+60/32*新增脱硫量–新增风量*6％*120/16)/(吸收塔底面积*吸收塔液位值)。= (Total original calcium sulfite + 60/32 * new desulfurization volume-new air volume * 6% * 120/16) / (absorption tower bottom area * absorption tower liquid level value).
其中，新增脱硫量可由吸收塔SO2入口浓度、出口浓度、烟气流量计算得出；新增风量，也就是氧化风机的氧化风流量的累计得出。Among them, the new desulfurization amount can be calculated from the SO2 inlet concentration, outlet concentration, and flue gas flow rate of the absorption tower; the added air volume, which is the cumulative amount of the oxidizing air flow of the oxidation fan.
S20：依据亚硫酸钙浓度在线仪表得到的亚硫酸钙浓度，结合浆液池的底面积和浆液液面高度，计算亚硫酸钙总量，亚硫酸钙总量＝亚硫酸钙浓度*底面积*液位；S20: Calculate the total amount of calcium sulfite based on the concentration of calcium sulfite obtained from the online meter of the calcium sulfite concentration combined with the bottom area of the slurry tank and the height of the slurry liquid surface. Total calcium sulfite = calcium sulfite concentration * bottom area * liquid Bit
S30：根据亚硫酸钙总量，计算氧需求量，再根据大气含氧量为6％，计算氧化风需求量；S30: Calculate the oxygen demand based on the total calcium sulfite, and then calculate the oxidizing wind demand based on the atmospheric oxygen content of 6%;
S40：根据氧化风需求量，指导各氧化风机的启停和送风量，合理启用氧化风机的数量和档数的选择，尽量控制到输送的风量大于或略大于所需的送风量，降低能耗；S40: Guide the start, stop, and supply of each oxidizing fan according to the demand of oxidizing wind, and reasonably select the number and number of gears of the oxidizing fan, and try to control the delivered air volume to be greater than or slightly larger than the required air supply volume and reduce Energy consumption
S50：利用线下化验数据，迭代校正在线仪表的误差。亚硫酸钙浓度在线仪表具有一定的误差，其误差来源主要是：亚硫酸钙氧化为石膏的反应是可逆的，这影响到亚硫酸钙的总量比理论值要高些；排出石膏时，亚硫酸钙总量会有所减少，这影响到亚硫酸钙的总量比理论值要低些。这些误差源将影响到亚硫酸钙总量的计算，长时间累计可使误差越来越大，影响亚硫酸钙在线仪表的可用性，因此需要线下化验的迭代纠偏，保证亚硫酸钙在线仪表的准确性和可用性，即通过线下化验获取亚硫酸钙浓度后，对亚硫酸钙在线仪表进行相应的调整。S50: Use offline test data to iteratively correct the errors of the online meter. The on-line meter of calcium sulfite concentration has certain errors. The main sources of error are: the reaction of calcium sulfite to gypsum is reversible, which affects the total amount of calcium sulfite to be higher than the theoretical value; The total amount of calcium sulfate will decrease, which affects that the total amount of calcium sulfite is lower than the theoretical value. These sources of error will affect the calculation of the total amount of calcium sulfite. Over time, the error will become larger and larger, affecting the availability of the calcium sulfite online instrument. Therefore, iterative correction of offline testing is required to ensure the calcium sulfite online instrument. Accuracy and availability, that is, after obtaining the calcium sulfite concentration through offline testing, the calcium sulfite online meter is adjusted accordingly.
S51：保留线下化验时间点相关参数，所述参数包括亚硫酸钙浓度在线仪表采集到的亚硫酸钙浓度和吸收塔液位值；S51: Retain relevant parameters of the offline test time point, the parameters including the calcium sulfite concentration and the absorption tower liquid level value collected by the online meter;
S51：根据当时的亚硫酸钙浓度计算浓度偏差和总量偏差，较正拟合的亚硫酸钙浓度在线仪表。S51: Calculate the concentration deviation and the total deviation according to the calcium sulfite concentration at the time, and compare the positive fitting calcium sulfite concentration online meter.
S53：根据浓度偏差和总量偏差，计算偏差调整系数，改进亚硫酸钙浓度跟踪模型的精确性。对于不同的工况，其误差源不同或者存在区别，偏差调整系数就不相同，只有当误差源没有发生明显改变或者误差趋势具有一定的稳定性时，偏差调整系数才会固定下来或者在可接受的小范围内波动。S53: Calculate the deviation adjustment coefficient according to the concentration deviation and the total deviation to improve the accuracy of the calcium sulfite concentration tracking model. For different working conditions, the error source is different or different, and the deviation adjustment coefficient is different. Only when the error source has not changed significantly or the error trend has a certain stability, the deviation adjustment coefficient will be fixed or acceptable. Fluctuations within a small range.
S54：迭代纠偏。在原偏差调整系数的基础上做微细化调整，即通过不断的微调偏差调整系数，使得亚硫酸钙浓度跟踪模型更加准确，亚硫酸钙浓度在线仪表采集到的亚硫酸钙浓度才会更加贴近真实。S54: Iterative correction. Make fine adjustment based on the original deviation adjustment coefficient, that is, by continuously fine-tuning the deviation adjustment coefficient, the calcium sulfite concentration tracking model is more accurate, and the calcium sulfite concentration collected by the online meter of the calcium sulfite concentration will be closer to the real.
本实施例中，第一次使用步骤S11时，无需输入原始亚硫酸钙总量的值，或者输入一个预估值，将原始亚硫酸钙总量的值当成误差来源之一，此时亚硫酸钙浓度必定很高，需要大量的氧气，氧化风机的送风量可适当调高，此时亚硫酸钙浓度在线仪表采集到的亚硫酸钙浓度与真实浓度存在较大偏差，但是由于一直存在亚硫酸钙增量，氧化风机不会停止，在步骤S50迭代校正中，即经过第一次线下化验，就能得到第一次线下化验时刻的亚硫酸钙浓度和亚硫酸钙总量的误差大小，自行纠正该误差，然后在后续的多次线下化验过程中，不断的纠正后期出现的误差。In this embodiment, when step S11 is used for the first time, it is not necessary to input the value of the total amount of the original calcium sulfite, or enter an estimated value, and use the value of the total amount of the original calcium sulfite as one of the sources of error. The calcium concentration must be very high, and a large amount of oxygen is required. The amount of air supplied by the oxidation fan can be appropriately increased. At this time, the concentration of calcium sulfite collected by the online meter of calcium sulfite concentration has a large deviation from the true concentration. Increment of calcium sulfate, the oxidation fan will not stop. In the iterative correction of step S50, that is, after the first offline test, the error of the calcium sulfite concentration and the total calcium sulfite at the first offline test time can be obtained. Size, correct the error on its own, and then in the subsequent multiple offline tests, continuously correct errors that occur later.
在后续的步骤中，不断循环步骤S10到步骤S54，其中步骤S50到步骤S54的实施次数可以根据实际需求适当减少。In subsequent steps, steps S10 to S54 are continuously looped, wherein the number of times of implementation of steps S50 to S54 can be appropriately reduced according to actual needs.
实施例三，请参阅图1，本实施例提供了一种脱硫吸收塔氧化风机降耗***，与实施例二提供的方法相对应，包括亚硫酸钙浓度在线仪表、控制模块、数据采集模块、迭代纠偏模块。Embodiment 3, please refer to FIG. 1. This embodiment provides a system for reducing consumption of an oxidation fan of a desulfurization absorption tower, which corresponds to the method provided in Embodiment 2, and includes an online meter for calcium sulfite concentration, a control module, a data acquisition module, Iterative correction module.
其中，亚硫酸钙浓度在线仪表，用于计算亚硫酸钙浓度和亚硫酸钙总量。所述亚硫酸钙浓度在线仪表内设实时的亚硫酸钙浓度跟踪模型：Among them, the calcium sulfite concentration online meter is used to calculate the calcium sulfite concentration and the total calcium sulfite. The calcium sulfite concentration online meter has a real-time calcium sulfite concentration tracking model:
亚硫酸钙浓度＝(原始亚硫酸钙总量+60/32*新增脱硫量–新增风量*6％*120/16)/(吸收塔底面积*吸收塔液位值)；Calcium sulfite concentration = (total amount of original calcium sulfite + 60/32 * new desulfurization amount-new air volume * 6% * 120/16) / (absorption tower bottom area * absorption tower liquid level value);
其中，所述新增脱硫量由吸收塔SO2入口浓度、出口浓度、烟气流量计算得出；所述新增风量由氧化风机的氧化风流量的累计得出。The additional desulfurization amount is calculated from the inlet SO2 inlet concentration, the outlet concentration, and the flue gas flow rate of the absorption tower; and the additional air volume is obtained from the accumulated oxidizing air flow of the oxidizing fan.
监控模块，包括脱硫监控模块和氧化风机监控模块，通过脱硫监控模块监控脱硫过程，计算脱硫量，由于脱除的为氧化硫转换为亚硫酸钙，即可计算出亚硫酸钙增量；通过氧化风机监控模块监控氧化风机运行，计算累计氧化风流量，由于经氧化作用，亚硫酸钙被氧化为石膏，可得到亚硫酸钙减量，再根据公式，浆料池中，亚硫酸钙总量＝原始亚硫酸钙总量+亚硫酸钙增量–亚硫酸钙减量，亚硫酸钙浓度在线仪表即可根据公式，浓度＝总量/浆料体积，得到亚硫酸钙浓度。The monitoring module includes a desulfurization monitoring module and an oxidation fan monitoring module. The desulfurization monitoring module monitors the desulfurization process and calculates the amount of desulfurization. Since the removed is converted from sulfur oxide to calcium sulfite, the calcium sulfite increase can be calculated; through oxidation The fan monitoring module monitors the operation of the oxidizing fan and calculates the cumulative oxidizing air flow. Due to the oxidation, calcium sulfite is oxidized to gypsum, and the calcium sulfite loss can be obtained. According to the formula, the total calcium sulfite in the slurry tank = The total amount of original calcium sulfite + calcium sulfite increase-calcium sulfite decrease. The concentration of calcium sulfite can be calculated according to the formula, concentration = total amount / slurry volume to get the calcium sulfite concentration.
控制模块，根据亚硫酸钙浓度和亚硫酸钙总量，计算氧需求量，再根据大气含氧量，计算氧化风需求量，并指导各氧化风机的启停和送风量；The control module calculates the oxygen demand based on the calcium sulfite concentration and the total calcium sulfite, and then calculates the oxidizing wind demand based on the atmospheric oxygen content, and guides the start, stop and air supply of each oxidation fan;
迭代纠偏模块，利用线下化验迭代校正在线仪表的误差。Iterative correction module, iteratively corrects errors of online instruments by using offline testing.
线下化验一般从采样到获得化验结果，一般需要4～30小时，因此***需要保留线下化验时间点的亚硫酸钙浓度在线仪表采集到的亚硫酸钙浓度和吸收塔液位值，根据当时的亚硫酸钙浓度计算浓度偏差和总量偏差，较正拟合的亚硫酸钙浓度在线仪表。同时，所述迭代纠偏模块根据浓度偏差和总量偏差，计算偏差调整系数，改进亚硫酸钙浓度跟踪模型的精确性，并在迭代纠偏过程中，在原偏差调整系数的基础上做微细化调整。Offline testing generally takes 4 to 30 hours from sampling to obtaining test results, so the system needs to retain the calcium sulfite concentration at the offline test time point. The online calcium sulfite concentration and the absorption tower liquid level value collected by the instrument, according to the time Calculate the concentration deviation and the total deviation of the calcium sulfite concentration, compare the positive fitting calcium sulfite concentration online meter. At the same time, the iterative correction module calculates the deviation adjustment coefficient according to the concentration deviation and the total deviation, improves the accuracy of the calcium sulphite concentration tracking model, and makes iterative adjustment based on the original deviation adjustment coefficient during the iterative correction process.
使用本***时，无需输入原始亚硫酸钙总量的值，即可设定为零或者一个预估值，将原始亚硫酸钙总量的值当成误差来源之一，此时亚硫酸钙浓度必定很高，需要大量的氧气，氧化风机的送风量可适当调高，此时亚硫酸钙浓度在线仪表采集到的亚硫酸钙浓度与真实浓度存在较大偏差，但是由于一直存在亚硫酸钙增量，氧化风机不会停止，在步骤S50迭代校正中，即经过第一次线下化验，就能得到第一次线下化验时刻的亚硫酸钙浓度和亚硫酸钙总量的误差大小，自行纠正该误差，然后在后续的多次线下化验过程中，不断的纠正后期出现的 误差。When using this system, it is not necessary to input the value of the total amount of the original calcium sulfite, it can be set to zero or an estimated value. The value of the total amount of the original calcium sulfite is regarded as one of the sources of error. At this time, the concentration of the calcium sulfite must be It is very high and requires a large amount of oxygen. The amount of air supplied by the oxidation fan can be appropriately increased. At this time, the concentration of calcium sulfite collected by the online meter of the calcium sulfite concentration has a large deviation from the true concentration. The oxidation fan will not stop. In the iterative correction of step S50, that is, after the first offline test, the error of the calcium sulfite concentration and the total amount of calcium sulfite at the first offline test time can be obtained. Correct the error, and then in the subsequent multiple offline tests, continuously correct errors that occur later.
石灰石-石膏湿法脱硫工艺能够做出副产品石膏，石膏可用于水泥缓凝剂、石膏建筑制品、模型制作、医用食品添加剂、硫酸生产、纸张填料、油漆填料等，能够为电厂带来经济价值，而本发明提供的***对氧化风机具有指导优化运行的作，能够控制并减少副产品石膏生产过程的用电量，具有节能减排作用。The limestone-gypsum wet desulfurization process can make gypsum as a by-product. Gypsum can be used in cement retarders, gypsum building products, model making, medical food additives, sulfuric acid production, paper fillers, paint fillers, etc., and can bring economic value to power plants. The system provided by the invention has the function of guiding the optimal operation of the oxidation fan, can control and reduce the power consumption of the by-product gypsum production process, and has the function of energy saving and emission reduction.
综上所述，本发明和现有技术相比，具有如下优点：In summary, compared with the prior art, the present invention has the following advantages:
1、对氧化风机的启停具有指导作用，克服传统石灰石-石膏湿法脱硫工艺中，氧化风机的操作单一，提供风量过多的缺陷，具有节能减排的优点；1. It has a guiding effect on the start and stop of the oxidation fan, and overcomes the single operation of the oxidation fan in the traditional limestone-gypsum wet desulfurization process.
2、采用亚硫酸钙浓度在线仪表实时采集亚硫酸钙浓度信息，克服线下化验时间长，反应不及时的缺陷；2. Use calcium sulfite concentration on-line instrument to collect calcium sulfite concentration information in real time to overcome the disadvantages of long offline testing and untimely response;
3、亚硫酸钙浓度在线仪表运行方式简单，有效，成本低，无需采购昂贵的亚硫酸钙实时浓度检测仪器，减少了企业投入成本；3. The online meter operation method of calcium sulfite concentration is simple, effective, and low cost. There is no need to purchase expensive real-time calcium sulfite concentration detection instruments, which reduces the investment cost of the enterprise;
4、亚硫酸钙浓度在线仪表通过线下化验，具有自我迭代校正的功能，保证亚硫酸钙在线仪表的准确性和可用性。4. The online meter of calcium sulfite concentration passes the offline test and has the function of self-iterative correction to ensure the accuracy and availability of the online meter of calcium sulfite.
上面结合附图对本发明进行了示例性描述，显然本发明具体实现并不受上述方式的限制，只要采用了本发明的方法构思和技术方案进行的各种非实质性的改进，或未经改进将本发明的构思和技术方案直接应用于其它场合的，均在本发明的保护范围之内。The present invention has been exemplarily described above with reference to the accompanying drawings. Obviously, the specific implementation of the present invention is not limited by the foregoing manners, as long as various non-substantial improvements made by the method concept and technical solution of the present invention are adopted, or are not improved. It is within the protection scope of the present invention to directly apply the concept and technical solution of the present invention to other occasions.

Claims (10)

  1. 一种脱硫吸收塔氧化风机降耗方法，其特征在于，包括如下步骤：A method for reducing consumption of an oxidation fan of a desulfurization absorption tower, which is characterized by including the following steps:
    S10：拟合亚硫酸钙浓度在线仪表；S10: Fit on-line meter for calcium sulfite concentration;
    S20：依据亚硫酸钙浓度在线仪表得到的亚硫酸钙浓度，结合浆液池的底面积和浆液液面高度，计算亚硫酸钙总量；S20: Calculate the total amount of calcium sulfite based on the calcium sulfite concentration obtained from the online meter of the calcium sulfite concentration, combined with the bottom area of the slurry pool and the height of the slurry liquid surface;
    S30：根据亚硫酸钙总量，计算氧需求量，再根据大气含氧量，计算氧化风需求量；S30: Calculate the oxygen demand based on the total calcium sulfite, and then calculate the oxidizing wind demand based on the atmospheric oxygen content;
    S40：根据氧化风需求量，指导各氧化风机的启停和送风量；S40: Guide the start, stop and air supply of each oxidation fan according to the demand of oxidation wind;
    S50：利用线下化验数据，迭代校正在线仪表的误差。S50: Use offline test data to iteratively correct the errors of the online meter.
  2. 根据权利要求1所述的一种脱硫吸收塔氧化风机降耗方法，其特征在于，所述步骤S10包括：The method for reducing consumption of an oxidation fan of a desulfurization absorption tower according to claim 1, wherein the step S10 comprises:
    S11：建立实时的亚硫酸钙浓度跟踪模型：亚硫酸钙浓度＝(原始亚硫酸钙总量+60/32*新增脱硫量–新增风量*6％*120/16)/(吸收塔底面积*吸收塔液位值)；S11: Establish a real-time calcium sulfite concentration tracking model: Calcium sulfite concentration = (total amount of original calcium sulfite + 60/32 * new desulfurization amount-new air volume * 6% * 120/16) / (bottom of absorption tower Area * absorption tower liquid level value);
    模型主要属性包括：亚硫酸钙总量、吸收塔液位值、吸收塔底面积、原始亚硫酸钙总量、亚硫酸钙增量、亚硫酸钙减少量、亚硫酸钙总量、亚硫酸钙当前浓度、新增风需求量、新增脱硫量、新增风量。The main attributes of the model include: the total amount of calcium sulfite, the level of the absorption tower, the area of the bottom of the absorption tower, the total amount of original calcium sulfite, the increase in calcium sulfite, the decrease in calcium sulfite, the total amount of calcium sulfite, and calcium sulfite Current concentration, new air demand, new desulfurization, new air volume.
  3. 根据权利要求2所述的一种脱硫吸收塔氧化风机降耗方法，其特征在于，所述新增脱硫量由吸收塔SO 2入口浓度、出口浓度、烟气流量计算得出；所述新增风量由氧化风机的氧化风流量的累计得出。 The method for reducing consumption of an oxidation fan of a desulfurization absorption tower according to claim 2, wherein the additional desulfurization amount is calculated from the inlet concentration, outlet concentration, and flue gas flow rate of the absorption tower SO 2 ; The air volume is obtained by accumulating the oxidizing air flow of the oxidizing fan.
  4. 根据权利要求2所述的一种脱硫吸收塔氧化风机降耗方法，其特征在于，所述步骤S50包括：The method for reducing consumption of an oxidation fan for a desulfurization absorption tower according to claim 2, wherein the step S50 comprises:
    S51：保留线下化验时间点相关参数，所述参数包括亚硫酸钙浓度在线仪表采集到的亚硫酸钙浓度和吸收塔液位值；S51: Retain relevant parameters of the offline test time point, the parameters including the calcium sulfite concentration and the absorption tower liquid level value collected by the online meter;
    S51：根据当时的亚硫酸钙浓度计算浓度偏差和总量偏差，较正拟合的亚硫酸钙浓度在线仪表。S51: Calculate the concentration deviation and the total deviation according to the calcium sulfite concentration at the time, and compare the positive fitting calcium sulfite concentration online meter.
  5. 根据权利要求4所述的一种脱硫吸收塔氧化风机降耗方法，其特征在于，所述步骤S50包括：The method for reducing consumption of an oxidation fan for a desulfurization absorption tower according to claim 4, wherein the step S50 comprises:
    S53：根据浓度偏差和总量偏差，计算偏差调整系数，改进亚硫酸钙浓度跟踪模型的精确性；S53: Calculate the deviation adjustment coefficient according to the concentration deviation and the total deviation to improve the accuracy of the calcium sulfite concentration tracking model;
    S54：迭代纠偏，在原偏差调整系数的基础上做微细化调整。S54: Iteratively correct the deviation, and make fine adjustment based on the original deviation adjustment coefficient.
  6. 根据权利要求4或5所述的一种脱硫吸收塔氧化风机降耗方法，其特征在于，第一次使用步骤S11时，无需输入原始亚硫酸钙总量的值，将原始亚硫酸钙总量的值当成误差来源，在步骤S50迭代校正中，误差逐步自行纠正。The method for reducing the consumption of an oxidation fan of a desulfurization absorption tower according to claim 4 or 5, characterized in that, when step S11 is used for the first time, it is not necessary to input the value of the total amount of the original calcium sulfite, and the total amount of the original calcium sulfite is input. The value of is regarded as the source of the error. In the iterative correction in step S50, the error is gradually corrected by itself.
  7. 一种脱硫吸收塔氧化风机降耗***，其特征在于，包括亚硫酸钙浓度在线仪表、控制模块、监控模块、迭代纠偏模块；A consumption reduction system for an oxidation fan of a desulfurization absorption tower, which is characterized by including an on-line meter of calcium sulfite concentration, a control module, a monitoring module, and an iterative correction module;
    亚硫酸钙浓度在线仪表，用于计算亚硫酸钙浓度和亚硫酸钙总量；Calcium sulfite concentration online meter for calculating calcium sulfite concentration and total calcium sulfite;
    控制模块，根据亚硫酸钙浓度和亚硫酸钙总量，计算氧需求量，再根据大气含氧量，计算氧化风需求量，并指导各氧化风机的启停和送风量；The control module calculates the oxygen demand based on the calcium sulfite concentration and the total calcium sulfite, and then calculates the oxidizing wind demand based on the atmospheric oxygen content, and guides the start, stop and air supply of each oxidation fan;
    监控模块，包括脱硫监控模块和氧化风机监控模块，通过脱硫监控模块监控脱硫过程，通过氧化风机监控模块监控氧化风机运行状况，并采集亚硫酸钙浓度在线仪表计算亚硫酸钙浓度时所需的工况数据；The monitoring module includes a desulfurization monitoring module and an oxidation fan monitoring module. The desulfurization monitoring module monitors the desulfurization process, the oxidation fan monitoring module monitors the operation status of the oxidation fan, and collects the calcium sulfite concentration. Condition data
    迭代纠偏模块，利用线下化验迭代校正在线仪表的误差。Iterative correction module, iteratively corrects errors of online instruments by using offline testing.
  8. 根据权利要求7所述的一种脱硫吸收塔氧化风机降耗***，其特征在于，所述亚硫酸钙浓度在线仪表包括实时的亚硫酸钙浓度跟踪模型：亚硫酸钙浓度＝(原始亚硫酸钙总量+60/32*新增脱硫量–新增风量*6％*120/16)/(吸收塔底面积*吸收塔液位值)；所述新增脱硫量由吸收塔SO 2入口浓度、出口浓度、烟气流量计算得出；所述新增风量由氧化风机的氧化风流量的累计得出。 The consumption reduction system for an oxidation fan of a desulfurization absorption tower according to claim 7, wherein the on-line meter of calcium sulfite concentration includes a real-time calcium sulfite concentration tracking model: calcium sulfite concentration = (original calcium sulfite Total + 60/32 * Additional desulfurization volume—Additional air volume * 6% * 120/16) / (Absorption tower bottom area * Absorption tower liquid level value); The new desulfurization capacity is determined by the SO 2 inlet concentration , Outlet concentration, and flue gas flow rate are calculated; the added air volume is obtained by accumulating the oxidizing air flow rate of the oxidizing fan.
  9. 根据权利要求8所述的一种脱硫吸收塔氧化风机降耗***，其特征在于，所述迭代纠偏模块保留线下化验时间点的亚硫酸钙浓度在线仪表采集到的亚硫酸钙浓度和吸收塔液位值，根据当时的亚硫酸钙浓度计算浓度偏差和总量偏差，较正拟合的亚硫酸钙浓度在线仪表。The consumption reduction system for an oxidation fan of a desulfurization absorption tower according to claim 8, wherein the iterative correction module retains the calcium sulfite concentration and the absorption tower collected by the on-line meter at the offline test time For the liquid level value, calculate the concentration deviation and the total deviation according to the calcium sulfite concentration at that time, and compare the positive fitting calcium sulfite concentration on-line meter.
  10. 根据权利要求9所述的一种脱硫吸收塔氧化风机降耗***，其特征在于，所述迭代纠偏模块根据浓度偏差和总量偏差，计算偏差调整系数，改进亚硫酸钙浓度跟踪模型的精确性，并在迭代纠偏过程中，在原偏差调整系数的基础上做微细化调整。The consumption reduction system for an oxidation fan of a desulfurization absorption tower according to claim 9, wherein the iterative correction module calculates a deviation adjustment coefficient according to the concentration deviation and the total deviation, thereby improving the accuracy of the calcium sulfite concentration tracking model. In the process of iterative correction, fine adjustment is made on the basis of the original deviation adjustment coefficient.
PCT/CN2019/089239 2018-09-10 2019-05-30 Method and system for consumption reduction of oxidation air blowers in desulfurizing absorption tower WO2020052276A1 (en)

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