Desulfurization wastewater treatment system based on flash evaporation technology

Abstract

The invention relates to the technical field of desulfurization wastewater treatment, in particular to a desulfurization wastewater treatment system based on a flash evaporation technology. Comprising a storage spraying unit which is connected with a pump outlet of desulfurization wastewater through a pipeline and is used for controlling the sedimentation state of the desulfurization wastewater; the central control unit is used for establishing a desulfurization wastewater flow prediction model and generating a flow prediction curve of the desulfurization wastewater; the central control unit is also used for establishing a temperature prediction model of the evaporation tower and generating a temperature change curve; and the central control unit is also used for setting working parameters of the storage spraying unit according to the flow pre-estimation curve and the temperature change curve. A plurality of adjusting periods are established, the real-time spraying amount is adjusted according to the preset evaporation model, the flow of the desulfurization wastewater and the real-time temperature of the evaporation tower, the evaporation efficiency is improved, meanwhile, the stirring module is additionally arranged, slurry precipitation in the desulfurization wastewater is avoided, the treatment efficiency of the desulfurization wastewater is improved, and stable operation of the system is guaranteed. And the overall operation and maintenance cost is reduced.

Description

Technical Field

[0001] The present application relates to the technical field of desulfurization wastewater treatment, and in particular to a desulfurization wastewater treatment system based on flash evaporation technology. Background Art

[0002] At present, after the zero-discharge transformation of desulfurization wastewater and terminal wastewater is completed, the desulfurization wastewater is taken out from the wastewater cyclone to the desulfurization wastewater tank, and then passes through the wastewater buffer tank, pH adjustment tank, reaction tank, flocculation tank, clarification tank, neutralization tank, dual-media filter, wastewater storage tank, spray water tank, and finally sent to the bypass flue drying tower for spray evaporation. The desulfurization wastewater treatment process flows through more than 10 tanks, and various conveying pumps, dosing devices, aeration fans, agitators and other equipment are used to adjust the pH value, COD, SS, heavy metals and other substances in the desulfurization wastewater, so that the desulfurization wastewater reaches a higher water quality condition before entering the bypass flue evaporation tower.

[0003] The process system is complicated, the equipment failure rate is high, and the system reliability is low, which greatly reduces the stability of the system. The process consumes various reagents in varying amounts, such as lime milk, flocculants, coagulants, organic sulfur, hydrochloric acid, sodium hypochlorite, etc. to adjust the water quality of the system outlet. The process will produce various pump shaft seal water, pipeline flushing water, drug preparation water and other fresh water sources into the wastewater system, increasing the heat loss of the evaporation tower flue gas. The sludge produced by the pretreatment system has excessive heavy metals and is a hazardous chemical. It needs to be harmlessly treated by a third party, which incurs a lot of costs. Summary of the invention

[0004] The purpose of this application is: to solve the above-mentioned technical problems, this application provides a desulfurization wastewater treatment system based on flash evaporation technology, aiming to simplify the treatment process of desulfurization wastewater, reduce operation and maintenance costs and wastewater volume, and achieve energy conservation and consumption reduction.

[0005] In some embodiments of the present application, based on the flash evaporation technology, the original desulfurization wastewater treatment system is improved, all the equipment for desulfurization wastewater pretreatment is removed, and the wastewater is directly sent out of the pump outlet pipe to the spray water tank, and then the spray water pump sprays the untreated high-concentration wastewater into the evaporation tower for evaporation. Heavy metals, suspended matter, sulfates, chlorides, etc. in the wastewater can be directly dried, evaporated and crystallized and then fall into the ash hopper, mixed with the ash conveying system into the fly ash discharge for comprehensive treatment, reducing the number of desulfurization wastewater treatment equipment, thereby simplifying the treatment process and reducing operation and maintenance costs.

[0006] In some embodiments of the present application, multiple adjustment cycles are established, and the real-time spraying amount is adjusted according to the preset evaporation model, the flow rate of desulfurized wastewater and the real-time temperature of the evaporation tower to improve the evaporation efficiency. At the same time, by adding a stirring module, the slurry precipitation in the desulfurized wastewater is avoided, the treatment efficiency of the desulfurized wastewater is improved, and the stable operation of the system is ensured. The overall operation and maintenance cost is reduced.

[0007] In some embodiments of the present application, a desulfurization wastewater treatment system based on flash evaporation technology is provided, comprising:

[0008] A storage spray unit is connected to the outlet of the desulfurization wastewater pump through a pipeline, and the storage spray unit is used to control the sedimentation state of the desulfurization wastewater;

[0009] The central control unit is used to establish a desulfurization wastewater flow prediction model and generate a desulfurization wastewater flow prediction curve;

[0010] The central control unit is also used to establish a temperature prediction model for the evaporation tower and generate a temperature variation curve;

[0011] The central control unit is also used to set the working parameters of the storage spray unit according to the flow estimation curve and the temperature change curve.

[0012] In some embodiments of the present application, the storage spray unit includes:

[0013] A storage tank for storing desulfurization wastewater;

[0014] A stirring module is arranged in the storage tank, and the stirring unit is used to control the settling state of the desulfurization wastewater in the storage tank;

[0015] An atomization module, connected to the storage tank, for controlling the atomization spraying parameters of the desulfurization wastewater in the storage tank;

[0016] The monitoring module is used to collect water quality parameters and equipment operation parameters of the desulfurization wastewater in the storage tank.

[0017] In some embodiments of the present application, the central control unit includes:

[0018] The first control module is used to establish multiple adjustment cycles and sequentially set the atomization spray parameters of the atomization module in each adjustment cycle according to the flow estimation curve and the temperature change curve;

[0019] The second control module is used to obtain the water quality parameters collected by the monitoring model and set the stirring speed of the stirring module according to the water quality parameters;

[0020] The first correction module is used to obtain the water quality parameters and equipment operation parameters collected by the monitoring module, and determine whether to generate a correction instruction.

[0021] In some embodiments of the present application, the first control module is further used to:

[0022] Obtain the flow estimation curve and temperature change curve of the current regulation cycle, and establish multiple time intervals;

[0023] Establish a time interval sequence A, A = (a1, a2...an), where ai is the i-th time interval of the current adjustment cycle, and n is the number of time intervals;

[0024] The preset evaporation model, temperature variation curve and flow estimation curve are sequentially generated to generate the evaporation volume interval in each time interval;

[0025] Establish a first-level control strategy sequence B, B = (b1, b2...bm), where bi is the i-th first-level control strategy; m is the number of first-level control strategies;

[0026] Generate control evaluation values ​​for each primary control strategy;

[0027] Set the first-level control strategy corresponding to the maximum control evaluation value as the second-level control strategy;

[0028] The atomization spray parameters of the atomization module in the current adjustment cycle are set according to the secondary control strategy.

[0029] In some embodiments of the present application, when setting the secondary control strategy according to all the primary operation evaluation values, it includes:

[0030] Select the target primary control strategy in sequence according to the primary control strategy sequence B;

[0031] Generate a control evaluation value d of the target primary control strategy according to a preset evaluation model;

[0032]

[0033] fi=ɑ1*H 1i +ɑ2*H 2i ;

[0034] Among them, e1 is the preset first weight coefficient, e2 is the preset second weight coefficient, Q1 is the preset first fixed coefficient; Q2 is the preset second fixed coefficient; ki is the operating cost evaluation value of the i-th time interval in the target first-level control strategy, and gi is the adjustment cost evaluation value of the i-th time interval and the i+1-th time interval in the target first-level control strategy; ɑ 1 is the first cost coefficient;

[0035] 2 is the preset second cost coefficient; H 1i is the operation evaluation value of the atomization module in the i-th time interval in the target primary control strategy; H 2i is the operation evaluation value of the tank in the i-th time interval in the target primary control strategy;

[0036] Generate the control evaluation value of each primary control strategy in turn.

[0037] In some embodiments of the present application, the first correction module is further used to:

[0038] Preset multiple correction time nodes;

[0039] Establish multiple monitoring indicators;

[0040] Generate the real-time reference value series C1 of the monitoring indicators at the current correction time node according to the water quality parameters and equipment operation parameters, C1 = (c1, c2 ... c n1 ), where n1 is the number of monitoring indicators; ci is the real-time reference value of the ith monitoring indicator at the current correction time node;

[0041] According to the secondary control strategy, the standard reference value series C2 of the monitoring indicators is generated, C2 = (c'1, c'2...c' n1 ), where c' i is the standard reference value of the ith monitoring indicator;

[0042] Generate a compensation spraying amount t according to the real-time reference value sequence C1 and the standard reference value sequence C2;

[0043] Whether to generate a correction instruction is determined based on the compensation spray volume t.

[0044] In some embodiments of the present application, when determining whether to generate a correction instruction according to the compensation spray volume t, it includes:

[0045] Generate a compensation spray volume t according to a preset compensation model;

[0046]

[0047] Among them, yi is the compensation spray volume corresponding to the unit change of the i-th evaluation index;

[0048] Preset the first compensation spray volume interval (T1, T2);

[0049] If t is not in the preset first compensation spray volume interval, a first-level correction instruction is generated, and the atomization spray parameters of the atomization module are corrected according to the compensation spray volume t.

[0050] In some embodiments of the present application, the first control module is further used to:

[0051] Set multiple feedback time nodes according to the adjustment cycle;

[0052] Obtain water quality parameters based on feedback time nodes;

[0053] Generate a sedimentation evaluation value f at the current feedback time node, and set the stirring speed v of the next adjustment cycle according to the sedimentation evaluation value f;

[0054]

[0055] Among them, ji is the reference value of the i-th slurry evaluation index at the current feedback time node; βi is the influencing factor of the i-th slurry evaluation index; r is the compensation coefficient set based on the flow prediction curve; θ is the number of slurry evaluation indicators.

[0056] In some embodiments of the present application, when setting the stirring speed v of the next adjustment cycle, it includes:

[0057] Presetting a first settlement evaluation value interval (F1, F2), a second settlement evaluation value interval (F2, F3) and a third settlement evaluation value interval (F3, F4);

[0058] If the sedimentation evaluation value f is within the preset first sedimentation evaluation value interval, the stirring speed v is set to the preset first stirring speed V1, that is, v=V1;

[0059] If the sedimentation evaluation value f is within the preset second sedimentation evaluation value interval, the stirring speed v is set to the preset second stirring speed V2, that is, v=V2;

[0060] If the sedimentation evaluation value f is within the preset third sedimentation evaluation value interval, the stirring speed v is set to the preset third stirring speed V3, that is, v=V3; and V1<V2<V3.

[0061] Compared with the prior art, the desulfurization wastewater treatment system based on flash evaporation technology in the embodiment of the present application has the following beneficial effects:

[0062] Based on the flash evaporation technology, the original desulfurization wastewater treatment system is improved, all the equipment for desulfurization wastewater pretreatment is removed, and the wastewater is directly sent out of the pump outlet pipe to the spray water tank, and then the spray water pump sprays the high-concentration wastewater without pretreatment into the evaporation tower for evaporation. The heavy metals, suspended solids, sulfates, chlorides, etc. in the wastewater can be directly dried, evaporated and crystallized and then fall into the ash hopper, mixed with the ash conveying system and discharged into the fly ash for comprehensive treatment, reducing the number of desulfurization wastewater treatment equipment, thereby simplifying the treatment process and reducing operation and maintenance costs.

[0063] By establishing multiple adjustment cycles and adjusting the real-time spraying volume according to the preset evaporation model, the flow rate of desulfurization wastewater and the real-time temperature of the evaporation tower, the evaporation efficiency is improved. At the same time, by adding a stirring module, the slurry precipitation in the desulfurization wastewater is avoided, the treatment efficiency of the desulfurization wastewater is improved, and the stable operation of the system is ensured, thereby reducing the overall operation and maintenance costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0064] Figure 1 It is a structural schematic diagram of a desulfurization wastewater treatment system based on flash evaporation technology in the preferred embodiment of the present application. DETAILED DESCRIPTION

[0065] The specific implementation methods of the present application are further described in detail below in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present application but are not intended to limit the scope of the present application.

[0066] In the description of the present application, it should be understood that the terms "center", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0067] The terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, unless otherwise specified, "plurality" means two or more.

[0068] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0069] like Figure 1 As shown, a desulfurization wastewater treatment system based on flash evaporation technology in a preferred embodiment of the present application includes:

[0070] The storage spray unit is connected to the outlet of the desulfurization wastewater pump through a pipeline, and the storage spray unit is used to control the sedimentation state of the desulfurization wastewater;

[0071] The central control unit is used to establish a desulfurization wastewater flow prediction model and generate a desulfurization wastewater flow prediction curve;

[0072] The central control unit is also used to establish the temperature prediction model of the evaporation tower and generate the temperature change curve;

[0073] The central control unit is also used to set the working parameters of the storage spray unit according to the flow estimation curve and the temperature change curve.

[0074] Specifically, the storage spray unit includes:

[0075] A storage tank for storing desulfurization wastewater;

[0076] A stirring module is arranged in the storage tank, and the stirring unit is used to control the settling state of the desulfurization wastewater in the storage tank;

[0077] An atomization module, connected to the storage tank, for controlling the atomization spraying parameters of the desulfurization wastewater in the storage tank;

[0078] The monitoring module is used to collect water quality parameters and equipment operation parameters of the desulfurization wastewater in the storage tank.

[0079] Specifically, the stirring module is preferably a stirrer, which is arranged in the storage tank, and the stirrer is used to prevent the slurry in the desulfurization wastewater from settling.

[0080] Specifically, the storage box can only temporarily store desulfurization wastewater to facilitate the subsequent atomization treatment by the atomization module.

[0081] Specifically, the atomization module is preferably an atomizer, which is used to atomize the desulfurization wastewater and control the spraying volume of the desulfurization wastewater per unit time in the evaporation tower.

[0082] Specifically, the flow prediction curve refers to the amount of desulfurization wastewater generated in a future period of time based on the prediction model, and the temperature change curve refers to the prediction curve of the bypass flue gas temperature in the evaporation tower in a future period of time based on the prediction model.

[0083] It can be understood that in the above embodiment, the original desulfurization wastewater treatment system is improved, all the equipment for desulfurization wastewater pretreatment is removed, and the wastewater is directly sent out of the pump outlet pipe to the spray water tank, and then the spray water pump sprays the untreated high-concentration wastewater into the evaporation tower for evaporation. Heavy metals, suspended matter, sulfates, chlorides, etc. in the wastewater can be directly dried, evaporated and crystallized and then fall into the ash hopper, mixed with the ash conveying system into the fly ash for comprehensive treatment, reducing the number of desulfurization wastewater treatment equipment, thereby simplifying the treatment process and reducing operation and maintenance costs.

[0084] In a preferred embodiment of the present application, the central control unit includes:

[0085] The first control module is used to establish multiple adjustment cycles and sequentially set the atomization spray parameters of the atomization module in each adjustment cycle according to the flow estimation curve and the temperature change curve;

[0086] The second control module is used to obtain the water quality parameters collected by the monitoring model and set the stirring speed of the stirring module according to the water quality parameters;

[0087] The first correction module is used to obtain the water quality parameters and equipment operation parameters collected by the monitoring module, and determine whether to generate a correction instruction.

[0088] Specifically, the first control module is further used for:

[0089] Obtain the flow estimation curve and temperature change curve of the current regulation cycle, and establish multiple time intervals;

[0090] Establish a time interval sequence A, A = (a1, a2...an), where ai is the i-th time interval of the current adjustment cycle, and n is the number of time intervals;

[0091] The preset evaporation model, temperature variation curve and flow estimation curve are sequentially generated to generate the evaporation volume interval in each time interval;

[0092] Establish a first-level control strategy sequence B, B = (b1, b2...bm), where bi is the i-th first-level control strategy; m is the number of first-level control strategies;

[0093] Generate control evaluation values ​​for each primary control strategy;

[0094] Set the first-level control strategy corresponding to the maximum control evaluation value as the second-level control strategy;

[0095] The atomization spray parameters of the atomization module in the current adjustment cycle are set according to the secondary control strategy.

[0096] Specifically, the current adjustment cycle is divided equally to generate multiple time intervals, and the corresponding maximum evaporation amount is generated according to the different bypass flue gas temperatures in each time interval, and the minimum evaporation amount is generated according to the new amount of desulfurization wastewater, thereby establishing the evaporation amount interval and the corresponding spraying amount interval in each time interval.

[0097] Specifically, a single primary control strategy includes the spraying volume in each time interval. When establishing each primary control strategy, the corresponding single change value of the spraying volume is set, that is, the spraying volume in each time interval is an integer multiple of the single change value of the spraying volume, so as to generate all primary control strategies using the exhaustive method.

[0098] Specifically, when setting the secondary control strategy based on all the primary operation evaluation values, it includes:

[0099] Select the target primary control strategy in sequence according to the primary control strategy sequence B;

[0100] Generate a control evaluation value d of the target primary control strategy according to a preset evaluation model;

[0101]

[0102] fi=ɑ1*H 1i +ɑ2*H 2i ;

[0103] Among them, e1 is the preset first weight coefficient, e2 is the preset second weight coefficient, Q1 is the preset first fixed coefficient; Q2 is the preset second fixed coefficient; ki is the operating cost evaluation value of the i-th time interval in the target first-level control strategy, gi is the adjustment cost evaluation value of the i-th time interval and the i+1-th time interval in the target first-level control strategy; ɑ1 is the first cost coefficient;

[0104] 2 is the preset second cost coefficient; H 1i is the operation evaluation value of the atomization module in the i-th time interval in the target primary control strategy; H 2i is the operation evaluation value of the tank in the i-th time interval in the target primary control strategy;

[0105] Generate the control evaluation value of each primary control strategy in turn.

[0106] Specifically, the larger the control evaluation value, the higher the operating efficiency of the corresponding first-level control strategy and the lower the operation and maintenance cost.

[0107] Specifically, the larger the spray volume in a single time interval, the higher the operating cost of the corresponding atomization module, the lower its operating evaluation value, the smaller its spray volume, and the lower the corresponding operating evaluation value of the storage box. If there is a time node where the storage volume exceeds the safe storage volume of the storage box, the corresponding storage evaluation value tends to infinitesimal, and the corresponding primary control strategy is eliminated.

[0108] Specifically, the adjustment cost refers to the additional cost required to adjust the spray volume of the atomization module. The greater the adjustment cost, the lower the corresponding adjustment cost evaluation value, thereby avoiding frequent switching of the spray volume of the atomization module.

[0109] Specifically, in the above embodiment, by establishing multiple adjustment cycles, and according to the preset evaporation model, the flow rate of the desulfurization wastewater and the real-time temperature of the evaporation tower, the real-time spraying amount is adjusted to improve the evaporation efficiency.

[0110] In a preferred embodiment of the present application, the first correction module is further used for:

[0111] Preset multiple correction time nodes;

[0112] Establish multiple monitoring indicators;

[0113] Generate the real-time reference value series C1 of the monitoring indicators at the current correction time node according to the water quality parameters and equipment operation parameters, C1 = (c1, c2 ... c n1 ), where n1 is the number of monitoring indicators; ci is the real-time reference value of the ith monitoring indicator at the current correction time node;

[0114] According to the secondary control strategy, the standard reference value series C2 of the monitoring indicators is generated, C2 = (c'1, c'2...c' n1 ), where c' i is the standard reference value of the ith monitoring indicator;

[0115] Generate a compensation spraying amount t according to the real-time reference value sequence C1 and the standard reference value sequence C2;

[0116] Whether to generate a correction instruction is determined based on the compensation spray volume t.

[0117] Specifically, when judging whether to generate a correction instruction according to the compensation spraying amount t, it includes:

[0118] Generate a compensation spray volume t according to a preset compensation model;

[0119]

[0120] Among them, yi is the compensation spray volume corresponding to the unit change of the i-th evaluation index;

[0121] Preset the first compensation spray volume interval (T1, T2);

[0122] If t is not in the preset first compensation spray volume interval, a first-level correction instruction is generated, and the atomization spray parameters of the atomization module are corrected according to the compensation spray volume t.

[0123] Specifically, a single adjustment cycle includes multiple correction time nodes.

[0124] Specifically, the preset evaporation model is established based on various monitoring indicators, including but not limited to bypass flue gas temperature, solid matter content in desulfurization wastewater and other parameters. When the various evaluation indicators change, the evaporation efficiency will be affected.

[0125] Specifically, the standard evaluation value refers to the preset reference value of each monitoring indicator when formulating the secondary control strategy.

[0126] Specifically, yi can be set according to the influence of different monitoring indicators on the evaporation efficiency, and the compensation spray amount can be either a positive value, that is, increasing the spray amount, or a negative value, that is, reducing the spray amount.

[0127] Specifically, in the above embodiment, by setting a plurality of monitoring indicators, the spray parameters of the atomization module are dynamically adjusted according to the real-time operating parameters of the system, thereby ensuring the evaporation efficiency and improving the treatment efficiency of the desulfurization wastewater.

[0128] In a preferred embodiment of the present application, the first control module is also used for:

[0129] Set multiple feedback time nodes according to the adjustment cycle;

[0130] Obtain water quality parameters based on feedback time nodes;

[0131] Generate a sedimentation evaluation value f at the current feedback time node, and set the stirring speed v of the next adjustment cycle according to the sedimentation evaluation value f;

[0132]

[0133] Among them, ji is the reference value of the i-th slurry evaluation index at the current feedback time node; βi is the influencing factor of the i-th slurry evaluation index; r is the compensation coefficient set based on the flow prediction curve; θ is the number of slurry evaluation indicators.

[0134] Specifically, when setting the stirring speed v of the next adjustment cycle, it includes:

[0135] Presetting a first settlement evaluation value interval (F1, F2), a second settlement evaluation value interval (F2, F3) and a third settlement evaluation value interval (F3, F4);

[0136] If the sedimentation evaluation value f is within the preset first sedimentation evaluation value interval, the stirring speed v is set to the preset first stirring speed V1, that is, v=V1;

[0137] If the sedimentation evaluation value f is within the preset second sedimentation evaluation value interval, the stirring speed v is set to the preset second stirring speed V2, that is, v=V2;

[0138] If the sedimentation evaluation value f is within the preset third sedimentation evaluation value interval, the stirring speed v is set to the preset third stirring speed V3, that is, v=V3; and V1<V2<V3.

[0139] Specifically, the slurry evaluation indicators include, but are not limited to, the amount of desulfurization wastewater in the storage tank, the content of various solid substances in the desulfurization wastewater and other parameters. The larger the sedimentation evaluation value, the greater the possibility of sedimentation of the desulfurization wastewater in the current storage tank.

[0140] Specifically, in the above embodiment, by dynamically adjusting the working parameters of the stirring module, the slurry precipitation in the desulfurization wastewater is avoided, the treatment efficiency of the desulfurization wastewater is improved, and the stable operation of the system is ensured.

[0141] According to the first concept of this application, based on the flash evaporation technology, the original desulfurization wastewater treatment system is improved, all the equipment for desulfurization wastewater pretreatment is removed, and the wastewater is directly sent out of the pump outlet pipe to the spray water tank, and then the spray water pump sprays the untreated high-concentration wastewater into the evaporation tower for evaporation. Heavy metals, suspended matter, sulfates, chlorides, etc. in the wastewater can be directly dried, evaporated and crystallized and then fall into the ash hopper, mixed with the ash conveying system into the fly ash discharge for comprehensive treatment, reducing the number of desulfurization wastewater treatment equipment, thereby simplifying the treatment process and reducing operation and maintenance costs.

[0142] According to the second concept of the present application, by establishing multiple adjustment cycles, and adjusting the real-time spraying volume according to the preset evaporation model, the flow rate of desulfurization wastewater and the real-time temperature of the evaporation tower, the evaporation efficiency is improved, and by adding a stirring module, the slurry precipitation in the desulfurization wastewater is avoided, the treatment efficiency of the desulfurization wastewater is improved, and the stable operation of the system is ensured, thereby reducing the overall operation and maintenance costs.

[0143] The above is only a preferred implementation of the present application. It should be pointed out that for ordinary technicians in this technical field, several improvements and substitutions can be made without departing from the technical principles of the present application. These improvements and substitutions should also be regarded as the scope of protection of the present application.

Claims

1. A desulfurization wastewater treatment system based on flash evaporation technology, characterized in that: include: A storage spray unit is connected to the outlet of the desulfurization wastewater pump through a pipeline, and the storage spray unit is used to control the sedimentation state of the desulfurization wastewater; The central control unit is used to establish a desulfurization wastewater flow prediction model and generate a desulfurization wastewater flow prediction curve; The central control unit is also used to establish a temperature prediction model for the evaporation tower and generate a temperature variation curve; The central control unit is also used to set the working parameters of the storage spray unit according to the flow estimation curve and the temperature change curve.

2. The desulfurization wastewater treatment system based on flash evaporation technology according to claim 1, characterized in that: The storage spray unit comprises: A storage tank for storing desulfurization wastewater; A stirring module is arranged in the storage tank, and the stirring unit is used to control the settling state of the desulfurization wastewater in the storage tank; An atomization module, connected to the storage tank, for controlling the atomization spraying parameters of the desulfurization wastewater in the storage tank; The monitoring module is used to collect water quality parameters and equipment operation parameters of the desulfurization wastewater in the storage tank.

3. The desulfurization wastewater treatment system based on flash evaporation technology according to claim 2, characterized in that: The central control unit comprises: The first control module is used to establish multiple adjustment cycles and sequentially set the atomization spray parameters of the atomization module in each adjustment cycle according to the flow estimation curve and the temperature change curve; The second control module is used to obtain the water quality parameters collected by the monitoring model and set the stirring speed of the stirring module according to the water quality parameters; The first correction module is used to obtain the water quality parameters and equipment operation parameters collected by the monitoring module, and determine whether to generate a correction instruction.

4. The desulfurization wastewater treatment system based on flash evaporation technology according to claim 3, characterized in that: The first control module is also used for: Obtain the flow estimation curve and temperature change curve of the current regulation cycle, and establish multiple time intervals; Establish a time interval sequence A, A = (a1, a2...an), where ai is the i-th time interval of the current adjustment cycle, and n is the number of time intervals; The preset evaporation model, temperature variation curve and flow estimation curve are sequentially generated to generate the evaporation volume interval in each time interval; Establish a first-level control strategy sequence B, B = (b1, b2...bm), where bi is the i-th first-level control strategy; m is the number of first-level control strategies; Generate control evaluation values ​​for each primary control strategy; Set the first-level control strategy corresponding to the maximum control evaluation value as the second-level control strategy; The atomization spray parameters of the atomization module in the current adjustment cycle are set according to the secondary control strategy.

5. The desulfurization wastewater treatment system based on flash evaporation technology according to claim 4, characterized in that: When setting the secondary control strategy based on all primary operation evaluation values, it includes: Select the target primary control strategy in sequence according to the primary control strategy sequence B; Generate a control evaluation value d of the target primary control strategy according to a preset evaluation model; fi=ɑ1*H 1i +ɑ2*H 2i ; Among them, e1 is the preset first weight coefficient, e2 is the preset second weight coefficient, Q1 is the preset first fixed coefficient; Q2 is the preset second fixed coefficient; ki is the operating cost evaluation value of the i-th time interval in the target first-level control strategy, and gi is the adjustment cost evaluation value of the i-th time interval and the i+1-th time interval in the target first-level control strategy; ɑ 1 is the first cost coefficient; 2 is the preset second cost coefficient; H 1i is the operation evaluation value of the atomization module in the i-th time interval in the target primary control strategy; H 2i is the operation evaluation value of the tank in the i-th time interval in the target primary control strategy; Generate the control evaluation value of each primary control strategy in turn.

6. The desulfurization wastewater treatment system based on flash evaporation technology according to claim 5, characterized in that: The first correction module is also used for: Preset multiple correction time nodes; Establish multiple monitoring indicators; Generate the real-time reference value series C1 of the monitoring indicators at the current correction time node according to the water quality parameters and equipment operation parameters, C1 = (c1, c2 ... c n1 ), where n1 is the number of monitoring indicators; ci is the real-time reference value of the ith monitoring indicator at the current correction time node; According to the secondary control strategy, the standard reference value series C2 of the monitoring indicators is generated, C2 = (c'1, c'2...c' n1 ), where c' i is the standard reference value of the ith monitoring indicator; Generate a compensation spraying amount t according to the real-time reference value sequence C1 and the standard reference value sequence C2; Whether to generate a correction instruction is determined based on the compensation spray volume t.

7. The desulfurization wastewater treatment system based on flash evaporation technology according to claim 6, characterized in that: When judging whether to generate a correction instruction according to the compensation spraying amount t, it includes: Generate a compensation spray volume t according to a preset compensation model; Among them, yi is the compensation spray volume corresponding to the unit change of the i-th evaluation index; Preset the first compensation spray volume interval (T1, T2); If t is not in the preset first compensation spray volume interval, a first-level correction instruction is generated, and the atomization spray parameters of the atomization module are corrected according to the compensation spray volume t.

8. The desulfurization wastewater treatment system based on flash evaporation technology according to claim 3, characterized in that: The first control module is also used for: Set multiple feedback time nodes according to the adjustment cycle; Obtain water quality parameters based on feedback time nodes; Generate a sedimentation evaluation value f at the current feedback time node, and set the stirring speed v of the next adjustment cycle according to the sedimentation evaluation value f; Among them, ji is the reference value of the i-th slurry evaluation index at the current feedback time node; βi is the influencing factor of the i-th slurry evaluation index; r is the compensation coefficient set based on the flow prediction curve; θ is the number of slurry evaluation indicators.

9. The desulfurization wastewater treatment system based on flash evaporation technology according to claim 8, characterized in that: When setting the stirring speed v for the next adjustment cycle, it includes: Presetting a first settlement evaluation value interval (F1, F2), a second settlement evaluation value interval (F2, F3) and a third settlement evaluation value interval (F3, F4); If the sedimentation evaluation value f is within the preset first sedimentation evaluation value interval, the stirring speed v is set to the preset first stirring speed V1, that is, v=V1; If the sedimentation evaluation value f is within the preset second sedimentation evaluation value interval, the stirring speed v is set to the preset second stirring speed V2, that is, v=V2; If the sedimentation evaluation value f is within the preset third sedimentation evaluation value interval, the stirring speed v is set to the preset third stirring speed V3, that is, v=V3; and V1<V2<V3.

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