CN113361971A - Combined control method and system for gypsum dehydration and desulfurization wastewater - Google Patents
Combined control method and system for gypsum dehydration and desulfurization wastewater Download PDFInfo
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Abstract
The embodiment of the invention provides a gypsum dehydration desulfurization wastewater joint control method and a gypsum dehydration desulfurization wastewater joint control system, and belongs to the technical field of thermal power generating units. The method comprises the following steps: acquiring real-time operation parameters of the desulfurization system; constructing a real-time operation condition of the desulfurization system according to the real-time operation parameters of the desulfurization system, and predicting the operation condition of the desulfurization system after a fixed time period according to the real-time operation condition of the desulfurization system; comparing the predicted operation condition of the desulfurization system with a preset standard operation condition of the desulfurization system, if the difference value between the predicted operation condition and the preset standard operation condition is greater than a preset threshold value, correcting the predicted operation condition of the desulfurization system, and obtaining an adjustment scheme of the desulfurization system according to a correction result; and adjusting each regulation and control unit in the desulfurization system according to the adjustment scheme of the desulfurization system. The scheme of the invention realizes the whole-course linkage optimization control of gypsum dehydration and desulfurization wastewater of the desulfurization system, improves the intelligence of the system and reduces the energy waste of the system.
Description
Technical Field
The invention relates to the field of thermal power generating units, in particular to a gypsum dehydration desulfurization wastewater joint control method and a gypsum dehydration desulfurization wastewater joint control system.
Background
In a coal-fired power plant, sulfur pollution caused by burning fuel coal is a main factor of pollution of the atmosphere and water quality at present, most of combustible sulfur in coal is oxidized into sulfur dioxide after being burnt in a boiler at high temperature, and only 0.5-5 percent of the combustible sulfur is re-oxidized into sulfur trioxide. In the atmosphere, the oxidation of sulfur dioxide to sulfur trioxide is very slow, but catalytic oxidation can occur at high relative humidity or in the presence of particulates. In addition, when the ultraviolet rays of the sunlight are irradiated and nitrogen oxide exists, photochemical reaction can be carried out to generate sulfur trioxide and sulfuric acid mist, and the gases are very harmful to human bodies, animals and plants. The desulfurization system is a particularly important environmental protection system in a coal-fired power plant, is mainly used for carrying out the desulfurization work of discharged flue gas, converts sulfur substances in the flue gas into gypsum through the desulfurization system for secondary utilization, so as to ensure that the sulfur content in the discharged flue gas reaches the standard. However, both the desulfurization process and the subsequent gypsum conversion process produce a lot of waste water, which is also polluting. And if the wastewater is not discharged efficiently, the desulfurization effect of the desulfurization system can be directly influenced. If the sewage system continuously works with high load, energy waste can be caused. In order to reduce energy waste as much as possible on the premise of ensuring the discharge of waste water in the operation process of a desulfurization system, a gypsum dehydration and desulfurization waste water joint control method needs to be created.
Disclosure of Invention
The embodiment of the invention aims to provide a gypsum dehydration and desulfurization wastewater joint control method and a gypsum dehydration and desulfurization wastewater joint control system, so that energy waste is reduced as much as possible on the premise of ensuring the discharge of wastewater in the operation process of a desulfurization system.
In order to achieve the above object, a first aspect of the present invention provides a gypsum dehydration desulfurization waste water joint control method, which is applied to gypsum dehydration desulfurization waste water treatment of a desulfurization system in an environmental protection system, and comprises: acquiring real-time operation parameters of the desulfurization system; constructing a real-time operation condition of the desulfurization system according to the real-time operation parameters of the desulfurization system, and predicting the operation condition of the desulfurization system after a fixed time period according to the real-time operation condition of the desulfurization system; comparing the predicted operation condition of the desulfurization system with a preset standard operation condition of the desulfurization system, if the difference value between the predicted operation condition and the preset standard operation condition is greater than a preset threshold value, correcting the predicted operation condition of the desulfurization system, and obtaining an adjustment scheme of the desulfurization system according to a correction result; and adjusting each regulation and control unit in the desulfurization system according to the adjustment scheme of the desulfurization system.
Optionally, the real-time operation parameters of the desulfurization system include: the concentration of chloride ions in the desulfurization system, the liquid level of the tank and the density of the desulfurization tower; wherein, the tank includes: limestone slurry tank, process water tank, waste water buffer tank, filtrate water tank and accident slurry tank.
Optionally, the real-time operation condition of the desulfurization system includes: the desulfurization system has the advantages of desulfurization waste water discharge amount, upstream and downstream joint control rules, gypsum discharge amount and dehydration performance.
Optionally, the constructing a real-time operation condition of the desulfurization system according to the real-time operation parameters of the desulfurization system includes: determining the discharge amount of the desulfurization waste water according to the concentration of the chloride ions; determining the upstream and downstream joint control rule according to the tank liquid level; and determining the gypsum discharge amount and the dehydration performance according to the desulfurization tower density.
Optionally, the predicting the operation condition of the desulfurization system after a fixed time period according to the real-time operation condition of the desulfurization system includes: according to the desulfurization waste water discharge amount, predicting the desulfurization waste water discharge amount after a fixed time period by a preset chloride ion concentration prediction model; predicting the tank liquid level after a fixed time period by a preset correlation analysis meta-model prediction model according to the upstream and downstream joint control rule; and predicting the gypsum discharge amount after a fixed time period by a preset gypsum discharge prediction model according to the gypsum discharge amount and the dehydration performance.
Optionally, the method further includes: constructing a preset chloride ion concentration prediction model, a preset correlation analysis element model and a preset gypsum discharge prediction model; wherein, the constructing of the preset chloride ion concentration prediction model comprises the following steps: acquiring historical operating parameters of the desulfurization system, and screening out operating parameters influencing the concentration of chloride ions; training and correcting operation parameters influencing the chloride ion concentration according to a preset LSTM algorithm to obtain a correlation model of the chloride ion concentration and the operation power of a desulfurization system, and taking the correlation model as a preset chloride ion concentration prediction model; the constructing of the preset association analysis meta-model includes: acquiring historical operating parameters of the desulfurization system, and screening out operating parameters comprising tank liquid level and upstream and downstream control rules; obtaining a corresponding relation model of the tank liquid level and the upstream and downstream control relation according to a preset association rule algorithm, and taking the corresponding relation model as a preset association analysis meta-model; the constructing of the gypsum discharge prediction model includes: acquiring historical operating parameters of the desulfurization system, and screening out influence parameters influencing the gypsum discharge amount and the dehydration performance; training and correcting the influence parameters influencing the gypsum discharge amount and the dehydration performance according to a preset LSTM algorithm to obtain a correlation model of the gypsum discharge amount and the dehydration performance, the frequency number of a gypsum discharge pump and the operation number of cyclone sub-elements of a cyclone station, and taking the correlation model as a preset gypsum discharge prediction model.
Optionally, the preset threshold includes a desulfurization wastewater discharge threshold, a tank liquid level threshold and a gypsum discharge threshold; the method comprises the following steps of comparing the predicted operation condition of the desulfurization system with the preset standard operation condition of the desulfurization system, correcting the predicted operation condition of the desulfurization system if the difference value of the predicted operation condition of the desulfurization system and the preset standard operation condition of the desulfurization system is greater than a preset threshold value, and obtaining an adjustment scheme of the desulfurization system according to a correction result, wherein the adjustment scheme comprises the following steps: if the absolute value of the difference value between the predicted value of the desulfurization waste water discharge amount and the preset desulfurization waste water discharge amount standard value is larger than the waste water discharge amount threshold value, performing desulfurization waste water discharge amount correction according to the preset desulfurization waste water discharge amount standard value to obtain a corrected desulfurization system power parameter; if the absolute value of the difference between the predicted tank liquid level value and the preset tank liquid level standard value is larger than the tank liquid level threshold value, correcting an upstream and downstream joint control rule according to the preset tank liquid level standard value to obtain a corrected upstream and downstream joint control rule; and if the absolute value of the difference between the predicted gypsum discharge amount and the preset gypsum discharge amount standard value is larger than the gypsum discharge amount threshold value, correcting the gypsum discharge amount according to the preset gypsum discharge amount standard value to obtain the corrected gypsum discharge pump frequency and the corrected cyclone operation number of the cyclone station.
Optionally, the adjusting each regulation and control unit in the desulfurization system according to the adjustment scheme of the desulfurization system includes: adjusting the operation power of the desulfurization system according to the corrected power parameter of the desulfurization system; replying the upstream and downstream joint control rule according to the corrected upstream and downstream joint control rule; and correspondingly adjusting the operation conditions of the gypsum discharge pump and the cyclone of the cyclone station according to the corrected frequency of the gypsum discharge pump and the operation number of the cyclones of the cyclone station.
The invention provides a gypsum dehydration desulfurization waste water joint control system, which is applied to the gypsum dehydration desulfurization waste water treatment of a desulfurization system in an environment-friendly system, and comprises the following components: the acquisition unit is used for acquiring real-time operation parameters of the desulfurization system; the prediction unit is used for constructing the real-time operation condition of the desulfurization system according to the real-time operation parameters of the desulfurization system and predicting the operation condition of the desulfurization system after fixed time according to the real-time operation condition of the desulfurization system; a processing unit to: comparing the predicted operation condition of the desulfurization system with a preset standard operation condition of the desulfurization system, if the difference value between the predicted operation condition and the preset standard operation condition is greater than a preset threshold value, correcting the predicted operation condition of the desulfurization system, and obtaining an adjustment scheme of the desulfurization system according to a correction result; and the execution unit is used for adjusting each regulation and control unit in the desulfurization system according to the adjustment scheme of the desulfurization system.
In another aspect, the present invention provides a computer-readable storage medium, which stores instructions that, when executed on a computer, cause the computer to execute the above-mentioned gypsum dewatering and desulfurizing waste water joint control method.
Through the technical scheme, the parameter evolution rule of the desulfurization system for desulfurization wastewater and gypsum dehydration discharge is obtained by sorting the historical operating parameters of the desulfurization system. And then, acquiring real-time operation parameters of the system, predicting the operation condition in a future period of time according to a parameter evolution rule, and comparing the prediction result with a preset standard to judge whether the risk of difficult wastewater discharge exists. When the corresponding risk is identified, the system can be adjusted before the time node is predicted, and the system is ensured to be adjusted when running to the time node, so that the abnormal running condition is avoided. The scheme of the invention realizes the whole-course linkage optimization control of gypsum dehydration and desulfurization wastewater of the desulfurization system, improves the intelligence of the system and reduces the energy waste of the system.
Additional features and advantages of embodiments of the invention will be set forth in the detailed description which follows.
Drawings
The accompanying drawings, which are included to provide a further understanding of the embodiments of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the embodiments of the invention without limiting the embodiments of the invention. In the drawings:
FIG. 1 is a flow chart of steps of a combined control method for gypsum dehydration and desulfurization wastewater provided by one embodiment of the invention;
FIG. 2 is a flowchart illustrating steps for operating condition prediction in a method according to an embodiment of the present invention;
FIG. 3 is a system structure diagram of a system for controlling the wastewater of gypsum dehydration and desulfurization in accordance with one embodiment of the present invention.
Description of the reference numerals
10-an acquisition unit; 20-a prediction unit; 30-a processing unit; 40-execution unit.
Detailed Description
The following detailed description of embodiments of the invention refers to the accompanying drawings. It should be understood that the detailed description and specific examples, while indicating the present invention, are given by way of illustration and explanation only, not limitation.
FIG. 3 is a system configuration diagram of a gypsum dewatering and desulfurization wastewater combined control system according to one embodiment of the present invention. As shown in fig. 3, the embodiment of the present invention provides a gypsum dewatering and desulfurization waste water combined control system, which comprises: the acquisition unit 10 is used for acquiring real-time operation parameters of the desulfurization system; the prediction unit 20 is configured to construct a real-time operation condition of the desulfurization system according to the real-time operation parameter, and predict an operation condition after a preset fixed time according to the real-time operation condition; a processing unit 30 for: constructing a real-time operation condition of the desulfurization system according to the real-time operation parameters of the desulfurization system, and predicting the operation condition of the desulfurization system after a fixed time period according to the real-time operation condition of the desulfurization system; comparing the predicted operation condition of the desulfurization system with a preset standard operation condition of the desulfurization system, if the difference value between the predicted operation condition of the desulfurization system and the preset standard operation condition of the desulfurization system is larger than a preset threshold value, correcting the predicted operation condition of the desulfurization system, and obtaining an adjustment scheme of the desulfurization system according to a correction result; and the execution unit 40 is used for adjusting each regulation and control unit of the environmental protection system in advance according to the adjustment scheme.
FIG. 1 is a flow chart of a method for controlling the wastewater generated by dehydrating and desulfurizing gypsum according to an embodiment of the present invention. As shown in FIG. 1, the embodiment of the invention provides a combined control method for gypsum dehydration and desulfurization wastewater, which comprises the following steps:
step S10: and acquiring real-time operation parameters of the desulfurization system.
Specifically, in a coal-fired power plant, sulfur pollution after fuel coal combustion is a main factor of the current atmospheric and water pollution, most of combustible sulfur in coal is oxidized into sulfur dioxide after high-temperature combustion in a boiler, and only 0.5-5% of the combustible sulfur is re-oxidized into sulfur trioxide. In the atmosphere, the oxidation of sulfur dioxide to sulfur trioxide is very slow, but catalytic oxidation can occur at high relative humidity or in the presence of particulates. In addition, when the ultraviolet rays of the sunlight are irradiated and nitrogen oxide exists, photochemical reaction can be carried out to generate sulfur trioxide and sulfuric acid mist, and the gases are very harmful to human bodies, animals and plants. Atmospheric sulfur dioxide is a major cause of acid rain. Therefore, after the coal is combusted in the boiler system, the flue gas mixed with a large amount of sulfur-containing substances is discharged, and the flue gas is subjected to desulfurization treatment by the desulfurization system, so that the problem that the sulfur content in the discharged flue gas exceeds the standard and is caused is avoidedAnd the ecological pollution is generated. Under the action of a draught fan, flue gas enters an absorption tower of a desulfurization system, the absorption tower is of a countercurrent spraying hollow tower structure and integrates absorption and oxidation functions, the upper part of the absorption tower is an absorption area, and the lower part of the absorption tower is an oxidation area. The flue gas reversely contacts with the circulating slurry in the absorption tower, and the residual sulfide in the flue gas is washed and reacted downwards by the circulating slurry, so that the desulfurization effect is realized. The desulfurization system is generally provided with 3-5 slurry circulating pumps, and each slurry circulating pump correspondingly provides circulating slurry for one atomization spraying layer. The upper part of the absorption zone is provided with a secondary demister for absorbing SO2The latter slurry is passed to a circulating oxidation zone where calcium sulfite is oxidized to gypsum crystals by the blown air, while fresh limestone slurry is supplied to the absorption oxidation system by the absorbent preparation system. And discharging the reaction product slurry at the bottom of the reaction tower to a desulfurization byproduct system when the reaction product slurry reaches a certain density, and dehydrating to form gypsum. Then, according to the desulfurization principle of the desulfurization system, the following reactions are mainly involved in the whole desulfurization process:
the first relation, the reverse contact relation of the flue gas and the circulating slurry:
SO2+H2O＝HSO- 3+H+
relation two, the reactant is further oxidized relation:
and thirdly, reacting the limestone circulating slurry with one product of the relation to generate a calcium ion relation:
CaCO3+2H+＝Ca2++H2O+CO2
relation IV, the relation of generating calcium sulfate:
according to the above relational expression, about 10% of free ion gypsum is obtained after the gypsum slurry discharged from the absorption tower is separated, washed and dehydrated. In order to achieve gypsum recycling, solid gypsum must be obtained from the free-radical gypsum slurry by dewatering. The wastewater discharge during the desulfurization process or after the gypsum dehydration operation requires detailed planning. Not only the timely discharge of the waste is ensured, but also the waste of system resources can not be caused by overlarge discharge performance. Therefore, in order to optimize the wastewater discharge at the rear end of the desulfurization system, the operation condition of the desulfurization system and the required discharge requirement need to be acquired in detail, and then the operation condition is optimized according to the discharge requirement. And because the desulfurization system is dynamically changed by the operation load of the thermal power generating unit, the required pollution discharge efficiency of the desulfurization efficiency is dynamically changed, so that the fixed optimization scheme cannot meet the requirement of the desulfurization system, corresponding optimization is required according to real-time operation parameters of the system, the system optimization is guaranteed to be completed before a time node is predicted, system faults are reduced, and the system operation efficiency is improved.
Preferably, based on the above, the acquisition unit 10 is constructed at the position of the central processing module in the desulfurization system, and the operation parameters of each equipment unit in the desulfurization system are acquired in real time. The operation parameters are acquired by the sensor units configured by the equipment units, so that secondary investment of an acquisition module during system construction is avoided, and the system cost is reduced.
Step S20: and constructing the real-time operation condition of the desulfurization system according to the real-time operation parameters of the desulfurization system, and predicting the operation condition of the desulfurization system after a fixed time period according to the real-time operation condition of the desulfurization system.
The method mainly realizes the efficient discharge of the desulfurization wastewater and the gypsum dehydration, so that the simulation of the operating conditions of the desulfurization wastewater, the dehydration amount and various middle transfer box tanks is mainly carried out during the simulation of the operating conditions, the prediction of the operating conditions of each part in the future is correspondingly carried out, whether the operating conditions can abnormally operate at the nodes in the future is judged according to the prediction result, the system interference is carried out in advance, and the advanced regulation and control of the system are realized, so that the real-time regulation and control of the drainage of the desulfurization system are realized. Specifically, as shown in fig. 2, the method includes the following steps:
step S201: and (4) carrying out desulfurization waste water discharge amount simulation and prediction.
Specifically, the main factors influencing the discharge amount of the wastewater from the desulfurization system include the operating efficiency of the desulfurization system, that is, the number of operations of the slurry circulating pump, the supply voltage, and the like. However, the desulfurization efficiency and the emission cannot be intuitively obtained only through the information such as the working quantity, the power supply voltage and the like of the slurry circulating pump, and a direct relation quantity needs to be found. Preferably, the direct correlation relationship between the concentration of the chloride ions in the system and the discharged amount of the desulfurization wastewater can be known according to a preset correlation rule algorithm. Therefore, the concentration of chloride ions in the system can be directly known by obtaining the discharge amount of the desulfurization waste water. The acquisition unit 10 acquires the concentration of sulfur ions in the system in real time, and then changes the concentration of chloride ions for a future period of time according to a preset chloride ion concentration prediction model. Preferably, a chloride ion concentration prediction model is firstly constructed, and historical operating parameters of the desulfurization system are collected, wherein the historical operating parameters cover the rule that the chloride ion concentration changes along with the efficiency change of the desulfurization system. Firstly, data preprocessing is carried out, invalid information in the data is filtered, only historical operating parameters influencing the concentration of the chloride ions are reserved, and then indirect parameters and actual parameters in the operating parameters are repaired through a preset estimation method, such as a single-dimensional estimation method and a multi-dimensional estimation method. After parameter repairing is completed, operating parameters are unified to a standard according to real weight through a data standard algorithm, a parameter type with the highest association degree with the chloride ion concentration is screened out, and an association relation between the parameter type and the chloride ion concentration is obtained. And the concentration of the chloride ions can be accurately simulated through corresponding parameter acquisition subsequently. And then establishing a linkage relation according to the relation between the concentration of the chloride ions and the desulfurization system, namely calculating the current desulfurization wastewater discharge amount through the known concentration of the chloride ions. And then, the real-time desulfurization waste water amount can be directly simulated through the collected operation parameters by the two correlation models. According to the parameter development rule, the development rule of the chloride ion concentration in a future period of time can be predicted, so that the development rule of the desulfurization wastewater in the future period of time can be obtained. And a preset time node is specified, so that the desulfurization wastewater amount corresponding to the future time node can be predicted and obtained.
Step S202: tank level simulation and prediction are performed.
Particularly, the desulfurization process of the desulfurization system is a complicated physical and chemical reaction process, and relates to a limestone slurry preparation system and SO2An absorption system, a flue gas system, a gypsum dehydration system, a wastewater treatment system and the like, which are mutually matched to finish SO in the flue gas2And (4) absorbing the components. Therefore, a plurality of auxiliary tanks exist in the system, including a limestone slurry tank, a process water tank, a wastewater buffer tank, a filtrate water tank and an accident slurry tank, so as to complete the functions of material supply, mixing, storage, transportation, reaction and the like in the desulfurization process. So many related requirements to coordinate the material supply and the subsequent wastewater discharge, and to ensure the efficient liquid flow in the pipeline, the coordinated control of the tank valves has to be performed. I.e. to ensure efficient operation of the material and waste water, without causing significant pipe restriction, and to require close fitting control for both upstream material supply and downstream waste water discharge. Theoretically, when each tank material is transported in normal carrying out, all there is the material of certain surplus in each tank, and this surplus material can not cause the tank to overflow the storehouse in the short time promptly, also can not cause the short time empty storehouse. If the upstream and downstream linkage valves are not matched, the stored materials in some tanks can be lower or higher than the preset standard liquid level. To avoid this, it is necessary to acquire the real-time liquid level height in each tank and then judge whether there is an abnormally transferred tank therein. For example, judge that the waste water liquid level in the waste water buffer tank is higher than preset standard value, then think that the waste water buffer tank has the risk of exploding the storehouse, need increase waste water discharge efficiency, waste water discharge pump and the valve of low reaches all need corresponding increase efficiency promptly. And if the tank liquid level and the upstream and downstream joint control rules are required to realize the joint replacement, corresponding joint model construction is required. Preferably, similar to the chloride ion prediction model, historical operating parameters of the desulfurization system are collected, and then the historical operating parameters are retained and compared with the historical operating parameters after a data pre-processing method is carried out according to a preset data pre-processing methodAnd the tank liquid levels with the same true weight and the corresponding upstream and downstream joint control rules can be trained through a preset correlation analysis meta-model, so that the linkage rules of the upstream and downstream joint control rules and the corresponding liquid levels can be obtained. And the current liquid level rule can be directly known subsequently according to the implemented upstream and downstream joint control rule, and whether the current liquid level is in a corresponding preset standard value interval or not is judged.
Step S203: gypsum discharge amount simulation and prediction were performed.
Specifically, the gypsum slurry contains gypsum crystals, CaCl and so on in terms of gypsum discharge amount and dewatering performance2Small amount of unreacted limestone, CaF2And a small amount of fly ash. After passing through the gypsum water flow swirling station, certain separation from impurities can be realized, and then the gypsum is washed and dehydrated through the vacuum belt dehydrator. The method specifically comprises the following steps:
the gypsum slurry is discharged from the absorption tower and pumped to a gypsum primary dewatering system, and is concentrated and classified by a gypsum hydrocyclone. The underflow (mainly coarse grains) of the gypsum hydrocyclone station flows to a gypsum slurry distribution box according to the gravity and then flows into a vacuum belt dehydrator for dehydration, and the thickness of a gypsum layer on the belt is realized by adjusting the speed of the belt so as to achieve the optimal dehydration effect. The overflow of the gypsum hydraulic cyclone station is collected in an overflow box of the cyclone station, most of the overflow is returned to the absorption tower through an overflow return pump of the cyclone station, and the other part of the overflow is sent to a wastewater cyclone station for concentration and separation through a gypsum discharge pump. The bottom flow of the wastewater cyclone station returns to the overflow tank of the cyclone station, and the overflow liquid of the wastewater cyclone station is discharged as wastewater. The quality of the gypsum is ensured by controlling the discharge amount of the wastewater to control the discharged fine impurity particles, and the concentrations of chloride ions and fluoride ions in the FGD system are controlled to ensure the safe and stable operation of the FGD system. In the secondary dewatering system, the concentrated gypsum slurry is dewatered in vacuum by a straight-air belt dewatering machine. The water content of the gypsum is reduced to below 10% after the gypsum is dehydrated in the part. The gypsum product after two-stage dehydration and concentration is high-quality desulfurized gypsum with the water content of less than 10 percent, and is conveyed to a gypsum storage bin through a gypsum belt conveyor. The bottom of the gypsum storage bin is provided with a discharging device for loading and transporting gypsum by an automobile. Based on this, it is known that the operating parameter affecting the gypsum discharge is the density of the desulfurization tower, i.e., the slurry density affects the subsequent gypsum output and dewatering output. And similarly, acquiring historical operating parameters of the desulfurization system to obtain the relationship among the concentration of chloride ions, the desulfurization performance and the density of the desulfurization tower, and then integrating the linkage relationship among the density of the desulfurization tower, the gypsum output and the dehydration output. And the real-time gypsum output and dehydration output of the system can be directly obtained according to the linkage relation. And then according to the parameter evolution rule in the historical operation parameters, performing parameter prediction value for a certain time later, and correspondingly obtaining the prediction values of the gypsum output and the dehydration output.
Step S30: and comparing the predicted operation condition of the desulfurization system with the preset standard operation condition of the desulfurization system, and if the difference value of the two is greater than a preset threshold value, correcting the predicted operation condition of the desulfurization system.
Specifically, after a predicted value of the waste water discharge amount, a tank liquid level and a measured value and a predicted value of the gypsum discharge amount are obtained, whether the system discharge capacity is a load standard or not can be judged according to the real cache performance and discharge performance of the system. Not only ensuring the smooth discharge of various products, but also not causing too much performance excesses. Therefore at first carry out waste water discharge amount prediction, judge the drainage performance that needs according to current waste water discharge amount, then contrast standard discharge waste water, if current waste water discharge amount is greater than standard waste water discharge amount, and the difference absolute value is greater than the default, then judge that current system can't in time carry out waste water discharge, then carry out system efficiency adjustment, under the demand that satisfies discharge to reach standard, reduce system efficiency, reduce waste water output. If the current wastewater discharge amount is smaller than the standard wastewater discharge amount and the absolute value of the difference value is larger than the preset threshold value, the current system pollution discharge performance is excessive, the system pollution discharge efficiency is reduced or the desulfurization efficiency of the desulfurization system is increased, and the sewage discharge performance is reduced while the sewage output is properly increased.
And for the tank liquid level, acquiring a predicted value of the tank liquid level through a real-time upstream and downstream joint control rule, and then judging whether the predicted value meets a standard value range. If the predicted tank liquid level value is larger than the standard value range, the mark corresponds to the related risk of overflowing, and the related downstream discharge performance needs to be increased or the upstream warehousing performance needs to be reduced. If the predicted value of the liquid level of the tank is smaller than the standard value range, the corresponding tank is at risk of empty bin, and the bin entering performance at the upstream of the tank needs to be increased or the bin discharging performance at the downstream needs to be reduced. The liquid level in the tank needs to be ensured to be continuously in the standard value range, and if the related liquid level is predicted to exceed the standard value range, the upstream and downstream joint control rule needs to be adjusted in advance.
The gypsum discharge amount is related to the gypsum output amount, and the produced gypsum needs to be transported and the waste water generated by dehydration needs to be discharged. After a gypsum output prediction value is obtained, the required system discharge performance is judged according to the prediction value, namely, effective discharge of gypsum and dehydration produced water is required to be ensured, and too much performance excess cannot be caused. And carrying out gypsum emission performance simulation on the corresponding prediction time node according to the prediction value, and then correcting the current system emission performance according to the simulation value.
Step S40: and obtaining an adjustment scheme of the desulfurization system according to the correction result, and adjusting each regulation and control unit in the desulfurization system according to the adjustment scheme of the desulfurization system.
Specifically, after the emission seeking of the prediction time node is obtained according to the predicted value of the desulfurization wastewater, the required working performance of the desulfurization system can be obtained according to the requirement, the current system performance is corrected according to the working performance, a correction route is simulated, namely the optimum correction route from the current system performance to the corrected system performance is generated, the adjustment schemes of the related equipment units are correspondingly generated according to the correction route, and then the equipment units are completely adjusted before the prediction time node according to the adjustment schemes. And ensuring that the system is adjusted before the system runs to the preset time node.
And when the predicted time node can be obtained according to the predicted tank liquid level, whether each tank has the risk of empty bin and overflow bin or not is judged, and if the corresponding risk occurs, the upstream and downstream joint control rule adjustment is needed. Firstly, extracting the position of the tank with the risk, and then judging the corresponding risk type. And determining and adjusting the joint control rules of the upstream and downstream of the tank according to the risk types. Since each tank is not present separately upstream and downstream, i.e. the downstream performance of the upstream tank affects the upstream performance of the downstream tank. Therefore, after a certain tank is in risk, adjustment cannot be performed only by referring to the current tank, and linkage control needs to be performed on other relevant tanks in a linkage manner, so that other relevant tanks are prevented from being in failure after the adjustment of the current tank is completed. On the premise of ensuring that all tanks are in a standard liquid level interval, correcting an optimal upstream and downstream joint control rule, comparing the upstream and downstream joint control rule with the currently existing upstream and downstream joint control rule, extracting a pump and a valve which need to be adjusted, and generating a corresponding adjustment amount according to the deviation amount. These pump and valve adjustments are done before the predicted time node so that the system is continuously in the stable interval.
After a predicted value of the output of gypsum is obtained, the gypsum discharge performance required by a predicted time node and the discharge performance of dehydrated produced water can be obtained, the current frequency number of the gypsum discharge pump and the operation number of the cyclone station are compared, when the deviation is yes, the frequency number of the gypsum discharge pump and the operation number of the cyclone station are adjusted according to the predicted performance, before the time node is predicted, the frequency number of the gypsum discharge pump and the operation number of the cyclone station are adjusted, so that when the system runs to the preset time node, the overall operation performance of the system is matched with the predicted performance of the corresponding time node, and the system is continuously and stably realized.
Embodiments of the present invention also provide a computer-readable storage medium having instructions stored thereon, which when executed on a computer, cause the computer to perform the above-mentioned gypsum dewatering and desulfurization wastewater joint control method.
Those skilled in the art will appreciate that all or part of the steps in the method for implementing the above embodiments may be implemented by a program, which is stored in a storage medium and includes several instructions to enable a single chip, a chip, or a processor (processor) to execute all or part of the steps in the method according to the embodiments of the present invention. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk, and other various media capable of storing program codes.
While the embodiments of the present invention have been described in detail with reference to the accompanying drawings, the embodiments of the present invention are not limited to the details of the above embodiments, and various simple modifications can be made to the technical solution of the embodiments of the present invention within the technical idea of the embodiments of the present invention, and the simple modifications are within the scope of the embodiments of the present invention. It should be noted that the various features described in the above embodiments may be combined in any suitable manner without departing from the scope of the invention. In order to avoid unnecessary repetition, the embodiments of the present invention will not be described separately for the various possible combinations.
In addition, any combination of the various embodiments of the present invention is also possible, and the same should be considered as disclosed in the embodiments of the present invention as long as it does not depart from the spirit of the embodiments of the present invention.
Claims (10)
1. A gypsum dehydration desulfurization wastewater joint control method is applied to gypsum dehydration desulfurization wastewater treatment of a desulfurization system in an environment-friendly system, and is characterized by comprising the following steps:
acquiring real-time operation parameters of the desulfurization system;
constructing a real-time operation condition of the desulfurization system according to the real-time operation parameters of the desulfurization system, and predicting the operation condition of the desulfurization system after a fixed time period according to the real-time operation condition of the desulfurization system;
comparing the predicted operation condition of the desulfurization system with a preset standard operation condition of the desulfurization system, if the difference value between the predicted operation condition and the preset standard operation condition is greater than a preset threshold value, correcting the predicted operation condition of the desulfurization system, and obtaining an adjustment scheme of the desulfurization system according to a correction result;
and adjusting each regulation and control unit in the desulfurization system according to the adjustment scheme of the desulfurization system.
2. The method of claim 1, wherein the real-time operating parameters of the desulfurization system comprise:
the concentration of chloride ions in the desulfurization system, the liquid level of the tank and the density of the desulfurization tower;
wherein, the tank includes: limestone slurry tank, process water tank, waste water buffer tank, filtrate water tank and accident slurry tank.
3. The method of claim 2, wherein the real-time operating conditions of the desulfurization system comprise:
the desulfurization system has the advantages of desulfurization waste water discharge amount, upstream and downstream joint control rules, gypsum discharge amount and dehydration performance.
4. The method of claim 3, wherein the constructing real-time operation conditions of the desulfurization system according to real-time operation parameters of the desulfurization system comprises:
determining the discharge amount of the desulfurization waste water according to the concentration of the chloride ions;
determining the upstream and downstream joint control rule according to the tank liquid level;
and determining the gypsum discharge amount and the dehydration performance according to the desulfurization tower density.
5. The method of claim 4, wherein the predicting the operation condition of the desulfurization system after the fixed period of time according to the real-time operation condition of the desulfurization system comprises:
according to the desulfurization waste water discharge amount, predicting the desulfurization waste water discharge amount after a fixed time period by a preset chloride ion concentration prediction model;
predicting the tank liquid level after a fixed time period by a preset correlation analysis meta-model prediction model according to the upstream and downstream joint control rule;
and predicting the gypsum discharge amount after a fixed time period by a preset gypsum discharge prediction model according to the gypsum discharge amount and the dehydration performance.
6. The method of claim 5, further comprising:
constructing a preset chloride ion concentration prediction model, a preset correlation analysis element model and a preset gypsum discharge prediction model; wherein the content of the first and second substances,
the construction of the preset chloride ion concentration prediction model comprises the following steps:
acquiring historical operating parameters of the desulfurization system, and screening out operating parameters influencing the concentration of chloride ions;
training and correcting operation parameters influencing the chloride ion concentration according to a preset LSTM algorithm to obtain a correlation model of the chloride ion concentration and the operation power of a desulfurization system, and taking the correlation model as a preset chloride ion concentration prediction model;
the constructing of the preset association analysis meta-model includes:
acquiring historical operating parameters of the desulfurization system, and screening out operating parameters comprising tank liquid level and upstream and downstream control rules;
obtaining a corresponding relation model of the tank liquid level and the upstream and downstream control relation according to a preset association rule algorithm, and taking the corresponding relation model as a preset association analysis meta-model;
the constructing of the gypsum discharge prediction model includes:
acquiring historical operating parameters of the desulfurization system, and screening out influence parameters influencing the gypsum discharge amount and the dehydration performance;
training and correcting the influence parameters influencing the gypsum discharge amount and the dehydration performance according to a preset LSTM algorithm to obtain a correlation model of the gypsum discharge amount and the dehydration performance, the frequency number of a gypsum discharge pump and the operation number of cyclone sub-elements of a cyclone station, and taking the correlation model as a preset gypsum discharge prediction model.
7. The method of claim 5, wherein the preset thresholds include a desulfurization waste water discharge threshold, a tank level threshold, and a gypsum discharge threshold;
the method for correcting the predicted operation condition of the desulfurization system and obtaining the adjustment scheme of the desulfurization system according to the correction result comprises the following steps of comparing the predicted operation condition of the desulfurization system with the preset standard operation condition of the desulfurization system, correcting the predicted operation condition of the desulfurization system if the difference value of the two is greater than a preset threshold value, and:
if the absolute value of the difference value between the predicted value of the desulfurization waste water discharge amount and the preset desulfurization waste water discharge amount standard value is larger than the waste water discharge amount threshold value, performing desulfurization waste water discharge amount correction according to the preset desulfurization waste water discharge amount standard value to obtain a corrected desulfurization system power parameter;
if the absolute value of the difference between the predicted tank liquid level value and the preset tank liquid level standard value is larger than the tank liquid level threshold value, correcting an upstream and downstream joint control rule according to the preset tank liquid level standard value to obtain a corrected upstream and downstream joint control rule;
and if the absolute value of the difference between the predicted gypsum discharge amount and the preset gypsum discharge amount standard value is larger than the gypsum discharge amount threshold value, correcting the gypsum discharge amount according to the preset gypsum discharge amount standard value to obtain the corrected gypsum discharge pump frequency and the corrected cyclone operation number of the cyclone station.
8. The method of claim 7, wherein the adjusting each of the control units in the desulfurization system according to the adjustment scheme of the desulfurization system comprises:
adjusting the operation power of the desulfurization system according to the corrected power parameter of the desulfurization system;
replying the upstream and downstream joint control rule according to the corrected upstream and downstream joint control rule;
and correspondingly adjusting the operation conditions of the gypsum discharge pump and the cyclone of the cyclone station according to the corrected frequency of the gypsum discharge pump and the operation number of the cyclones of the cyclone station.
9. The utility model provides a gypsum dehydration desulfurization waste water allies oneself with accuse system, is applied to among the environmental protection system gypsum dehydration desulfurization waste water treatment of desulfurization system, its characterized in that, the system includes:
the acquisition unit is used for acquiring real-time operation parameters of the desulfurization system;
the prediction unit is used for constructing the real-time operation condition of the desulfurization system according to the real-time operation parameters of the desulfurization system and predicting the operation condition of the desulfurization system after fixed time according to the real-time operation condition of the desulfurization system;
a processing unit to:
comparing the predicted operation condition of the desulfurization system with a preset standard operation condition of the desulfurization system, if the difference value between the predicted operation condition and the preset standard operation condition is greater than a preset threshold value, correcting the predicted operation condition of the desulfurization system, and obtaining an adjustment scheme of the desulfurization system according to a correction result;
and the execution unit is used for adjusting each regulation and control unit in the desulfurization system according to the adjustment scheme of the desulfurization system.
10. A computer-readable storage medium having instructions stored thereon, which when executed on a computer, cause the computer to perform the gypsum dewatering and desulfurization waste water joint control method according to any one of claims 1 to 8.
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