38 results about "Multiple-effect evaporator" patented technology

The present invention relates to the technical field of water distillers, and disclosed are a thermocompression multi-effect water distiller system and a control method therefor. The thermocompression multi-effect water distiller system comprises a distillation unit and a control unit; the distillation unit comprises a multi-effect evaporator; the multi-effect evaporator is a horizontal tube falling film evaporator and has a side-by-side configuration, and the shell pass of a preceding effect evaporator is communicated with the tube pass of a following effect evaporator; the control unit controls the distillation unit during working, and the control unit is a feedforward-cascaded fuzzy PID model predictive control system and comprises an inner-loop control system and an outer-loop control system; the inner-loop control system uses fuzzy PID control, and the inner-loop control system is provided with a control system for fluctuations in industrial steam pressure Psteam; and the outer-loop control system uses model predictive control. In the present invention, by using the thermocompression multi-effect water distiller system and the control method therefor, the heat exchange efficiency is greatly improved; and a novel control system is provided, enabling normal operation within a range of 40-200% of a set operating condition.

The invention relates to the field of power system control, and provides an intelligent coordination control method and system for a multi-source heat pump coupling dehumidification system of a power distribution station house, and the method comprises the steps: carrying out the characteristic analysis of a multi-source heat pump through a heat source quality evaluation model, and obtaining heat source characteristic parameters; dynamically reconstructing the heat exchange network topology according to the heat source characteristic parameters to obtain optimized heat exchange network configuration parameters; step dehumidification working medium circulation is conducted on the optimized heat exchange network configuration parameters through a multi-effect evaporator, and dehumidification working medium circulation parameters are obtained; performing neuromorphic control on the dehumidification working medium circulation parameters through a bionic pulse neural network to obtain a humidity control instruction; and dynamic load distribution is conducted on the multi-source heat pump system according to the humidity control instruction, an energy efficiency coordination optimization strategy is obtained, and coordination control is conducted on the multi-source heat pump through the energy efficiency coordination optimization strategy. The evaluation accuracy of the heat source performance parameters of the multi-source heat pump is improved, and the overall energy consumption level of the system is reduced.

The invention relates to the technical field of industrial equipment automatic control, in particular to a cooperative operation control method and system for a multi-effect evaporator. The method comprises the following steps: training a GRU-based reference feedforward model by using multi-source time sequence data in a clean state of equipment; secondly, an observation total heat exchange coefficient and a theoretical total heat exchange coefficient are obtained in real time, and a cleanliness evaluation factor is calculated through a filter to represent the scaling degree; secondly, performing nonlinear gain correction on the reference feed-forward signal based on the factor to obtain a self-adaptive feed-forward signal for compensating the scaling influence; and finally, generating a dynamic cooperative weight according to the volatility of the current working condition, and carrying out weighted fusion on the self-adaptive feedforward signal and the feedback control signal. According to the method, the problem that the static model is mismatched along with equipment scaling is solved, and stable and efficient control of the whole period is guaranteed.

The utility model is suitable for the technical field of evaporators, and provides a potassium carbonate multi-effect evaporator which comprises a plurality of evaporators and a filtered gas conveying assembly, and the evaporators are arranged in sequence; the evaporators comprise a first-effect evaporator, a second-effect evaporator and a third-effect evaporator; the first-effect evaporator, the second-effect evaporator and the third-effect evaporator are connected through water pipes, and water pumps are installed on the water pipes and used for conveying water flow in sequence. Heating assemblies are arranged in the evaporators and used for heating liquid in the evaporators; the filtered gas conveying assembly is arranged at the top end of each evaporator so that superior gas can be transferred one by one. Wherein the evaporator at the tail end is also provided with a precooler, and the precooler is connected with an external crystallizer; according to the multi-effect evaporator, the evaporation speed can be greatly increased, energy consumption during work is reduced, the interior of the multi-effect evaporator can be conveniently disassembled and maintained, and therefore the practicability of the multi-effect evaporator is effectively improved.

The present invention relates to the technical field of water distillers, and disclosed are a thermocompression multi-effect water distiller system and a control method therefor. The thermocompression multi-effect water distiller system comprises a distillation unit and a control unit; the distillation unit comprises a multi-effect evaporator; the multi-effect evaporator is a horizontal tube falling film evaporator and has a side-by-side configuration, and the shell pass of a preceding effect evaporator is communicated with the tube pass of a following effect evaporator; the control unit controls the distillation unit during working, and the control unit is a feedforward-cascaded fuzzy PID model predictive control system and comprises an inner-loop control system and an outer-loop control system; the inner-loop control system uses fuzzy PID control, and the inner-loop control system is provided with a control system for fluctuations in industrial steam pressure Psteam; and the outer-loop control system uses model predictive control. In the present invention, by using the thermocompression multi-effect water distiller system and the control method therefor, the heat exchange efficiency is greatly improved; and a novel control system is provided, enabling normal operation within a range of 40-200% of a set operating condition.

The invention belongs to the technical field of comprehensive utilization of Juncao, and particularly relates to a method for preparing furfural from Juncao and comprehensively utilizing the furfural. The method comprises the following steps: firstly, carrying out catalyst impregnation pretreatment on Juncao, carrying out hydrolysis reaction by using an integrated vertical hydrolysis pot, and separating after hydrolysis to obtain a furfural aqueous solution and a blow-off material, namely furfural residue; cooking the blown material through alkaline pulping, squeezing, washing with water, and bleaching to obtain finished pulp; black liquor obtained in the material spraying and squeezing process reacts by a multi-effect evaporator to obtain lignin; therefore, production of Juncao furfural and effective separation of pulp and lignin are realized.

The utility model discloses a biological trickling filtration water distribution and caustic soda flake callback PH value device which comprises a plurality of evaporators which are connected in series through a steam output pipeline and a concentrated solution output pipeline, the steam output pipeline of the last effect evaporator is provided with a condenser, the refrigerant of the condenser is water, and the concentrated solution output pipeline of the last effect evaporator is connected with the steam output pipeline of the last effect evaporator. A refrigerant output end of the condenser is fed into caustic soda flake adding equipment through a primary water pipeline, and a caustic soda flake tank is arranged at the top of the caustic soda flake adding equipment. According to the biological trickling filtration water distribution and caustic soda flake adding PH value back-adjusting device, the temperature of caustic soda flake water distribution is increased by utilizing the heat of the last-effect steam of the multi-effect evaporator, so that the temperature of the caustic soda flake water distribution reaches the temperature for efficiently dissolving caustic soda flakes, the device adapts to a cold outdoor caustic soda flake water distribution environment, and the efficiency and the solubility of the device are improved.

The invention relates to a chemical waste resource utilization technology, in particular to a system for preparing calcium chloride from calcium carbide method PVC byproduct hydrochloric acid and carbide slag. The device comprises a hydrochloric acid conveying pipeline, a filter, a reaction kettle, a carbide slag bin, a plate-and-frame filter press, an intermediate tank, a steam conveying pipeline, a multi-effect evaporator, a fluidized drying bed, an air heater, a high-salinity wastewater collecting tank, an induced draft fan, a hydrochloric acid conveying pump, a slurry pump, an intermediate pump and a vacuum pump. By integrating the hydrochloric acid purification unit, the neutralization reaction unit, the solid-liquid separation unit and the evaporation drying unit, the byproduct hydrochloric acid and the carbide slag are converted into a high-purity calcium chloride product, so that the problems of low efficiency and secondary pollution caused by isolated waste treatment in a traditional treatment mode are effectively solved; the method has the advantages of realizing resource utilization of byproduct hydrochloric acid and carbide slag, reducing environmental pollution, reducing waste treatment cost, avoiding secondary pollution and the like.

This disclosure describes energy efficient process to distill a process stream in a production facility. A process uses multiple effect evaporators, ranging from one evaporator to eight evaporators in each effect. The process arrangement shows an example of four effect evaporators, with a zero-effect evaporator having a single evaporator, a first-effect evaporator having a set of three evaporators, a second-effect evaporator having a set of three evaporators, and a third-effect evaporator having a set of evaporators to create condensed distillers solubles.

The utility model belongs to the technical field of biochemical engineering separation, and particularly provides a production system for solvent-free extraction of pentamethylene diamine in fermentation liquor, which comprises at least one decarburization tank, an alkalization tank, filtering equipment and a multi-effect evaporator which are connected in sequence, a discharge pipe at the bottom of the multi-effect evaporator is connected to a scraper evaporator, and the scraper evaporator is connected with the alkalization tank. A gas phase pipeline of the scraper evaporator is connected to the first rectification device; and a gas-phase pipeline at the top of the multi-effect evaporator is connected to the second rectifying tower. The production system for solvent-free extraction of pentamethylene diamine in fermentation liquor can reduce the use amount of alkalized materials, and is low in energy consumption and high in device operation stability.

The application provides a waste heat utilization system based on alumina production, which comprises a heat pump unit, a preheating desalted water tank and a heating desalted water tank; the input end of the heat pump unit is used for connecting the end of a multi-effect evaporator in alumina production, so as to recover the waste heat of exhaust steam generated in the last effect in the process of producing alumina by the multi-effect evaporator; the first output end of the heat pump unit is connected with the heating desalted water tank, the preheating desalted water tank is connected with the heating desalted water tank through a pipeline, and the preheating desalted water tank is used for providing desalted water; the heat pump unit is used for transmitting the waste heat of exhaust steam to the heating desalted water tank, and heating the desalted water of the heating desalted water tank by using the waste heat of exhaust steam. The system of the application utilizes the characteristic that the desalted water needs to be heated when being added into a desalted water receiver, for example, an oxygen removal tank, and uses the waste heat of exhaust steam at the end of the multi-effect evaporator in alumina production to heat the desalted water of the heating desalted water tank, so that the resources are effectively utilized and the economic benefits are improved.

The present application relates to a kind of acidic copper-containing waste liquid, aluminium mud collaborative recovery processing system and processing process, processing system includes acidic copper-containing waste liquid collection tank, acidic copper-containing waste liquid collection tank is sequentially connected first filter, preheater, preheater is connected condenser and multiple-effect evaporator respectively, multiple-effect evaporator is sequentially connected transfer tank, scrubber, second filter, and second filter is connected sodium chloride solution storage tank and copper sulfate preparation unit respectively;Processing system further includes the aluminium mud bin connected with acidification reaction kettle, and acidification reaction kettle is connected first filter press and condenser respectively, and first filter press is connected evaporation concentration chamber, and evaporation concentration chamber is connected crystalline aluminium chloride preparation unit and liquid polyaluminium chloride preparation unit respectively.The present application processing system and processing process are generated in the production process of printed circuit board acidic copper-containing waste liquid, aluminium mud generated in surface treatment industry are collaboratively treated, improve recovery processing efficiency, realize resource utilization, with economic benefit.

The utility model relates to a tin stripping waste liquid recovery processing device which comprises a sedimentation tank, the sedimentation tank is connected with a new tin stripping liquid regeneration kettle through an oxidation tank, a centrifugal machine, a buffer tank, a multi-effect evaporator and a condenser in sequence, the centrifugal machine is further connected with a filter through a pyrolysis tank and washing equipment in sequence, and the filter is respectively connected with a dryer and a first post-processing tank. And the first post-treatment tank is also respectively connected with a second post-treatment tank and the multi-effect evaporator, and the second post-treatment tank is connected with an inlet of the new tin stripping liquid regeneration kettle. According to the recovery treatment device for the tin stripping waste liquid, the tin stripping waste liquid is recycled, dissolved tin elements, iron elements and copper elements are all recovered, maximum utilization of resources is achieved, no other waste is generated in the recovery process, and secondary pollution is eliminated.

The invention relates to an energy-saving and environment-friendly intermittent pulping and cooking process which comprises the following steps: performing stepped heating type cooking on wood chips and cooking liquor to prepare slurry; after cooking is finished, reverse heat exchange is conducted on the dilute black liquor and the pulp, and hot black liquor is replaced; then, dilute black liquor is introduced again, and warm black liquor is replaced; the warm black liquor can be used as a material for preparing the cooking liquor; the hot black liquor is subjected to flash evaporation to remove 10-15% of moisture, the concentration of the hot black liquor is increased to 18-21 Be degrees, and the flash-evaporated hot black liquor firstly enters a quadruple-effect down-flow multi-effect evaporator to be concentrated to 28-30 Be degrees and then enters a sextuple-effect falling film evaporator to be concentrated to 65% or above; wherein secondary steam generated by flash evaporation is used as a first-effect heat source of the quadruple-effect down-flow multi-effect evaporator after liquid drops are removed through the steam-water separator. According to the method, flash secondary steam is combined to drive the first effect of the multi-effect evaporator, hot black liquor pretreatment concentration optimization alkali recovery and the like, so that energy gradient utilization is sufficient, comprehensive energy consumption is greatly reduced, and the win-win situation of environmental protection and resource recycling is achieved.

The utility model discloses a multi-effect evaporation wastewater treatment device, and relates to the technical field of wastewater treatment. The device comprises a filter box, a purification box and a gas-liquid separator, a heat exchange and heat preservation assembly is clamped and fixed to the peripheral surface of the filter box, the purification box is arranged on one side of the filter box, a heating furnace is clamped and fixed to the peripheral surface of the purification box, a high-pressure pump penetrates through the top of the peripheral surface of the heating furnace in a clamped mode, and a ventilation pipe penetrates through the top of the high-pressure pump in a clamped mode; a plurality of gas spraying pipes penetrate through and are clamped to the other end of the ventilation pipe; and a gas-liquid separator is arranged on one side of the purification box. By arranging the filter box, the purification box and the gas-liquid separator, the problems that a multi-effect evaporator improves the evaporation efficiency of waste water by heating the waste water, the needed heating time is long and the treatment efficiency is low when a large amount of waste water is heated, and a plurality of pipelines need to be used for transporting high-temperature air when the waste water is heated for multiple times, so that the waste water is wasted are solved. And part of heat is lost in the transportation process.

The invention relates to the technical field of multi-effect evaporators, in particular to an online sampling and detecting device for multi-effect seawater desalination, which comprises at least two evaporators, communicating pipes are arranged between the evaporators, each evaporator comprises a heating tank, a separating tank and a vacuum sampling tank, an inlet electromagnetic valve and an outlet electromagnetic valve are respectively arranged between the vacuum sampling tank and each communicating pipe, the inlet electromagnetic valve is communicated with one side, close to the previous-effect evaporator, of the communicating pipe, the outlet electromagnetic valve is communicated with one side, close to the next-effect evaporator, of the communicating pipe, and distilled water samples are collected by utilizing pressure difference through the vacuum sampling tank and the electromagnetic valves. On-line conductivity meter detection is combined, manual sampling and testing can be carried out when abnormity occurs, cyclic operation is carried out for multiple times per hour, auxiliary equipment such as a vacuum pump is not needed, stable operation of the system is not affected, leakage effect chambers can be rapidly detected and accurately positioned on line, maintenance time is shortened, shutdown loss is reduced, cost is low, and energy conservation and environmental protection are achieved.

The invention relates to a marine nuclear waste heat driven compact water and oxygen making system and a control method, and the system comprises a water making unit which comprises a multi-effect evaporator connected to a nuclear energy secondary loop system, the multi-effect evaporator heats seawater to generate steam and condenses the steam into fresh water, and the multi-effect evaporator is connected with a purification device for purifying the fresh water; the oxygen generation unit comprises a solid oxygen candle oxygen generation module and an electrolyzed water oxygen generation module, the solid oxygen candle oxygen generation module takes sodium chlorate as an oxygen source and generates oxygen through a thermal decomposition reaction, and pure water purified by the electrolyzed water oxygen generation module generates oxygen through electrolyzed water; and the control unit dynamically controls the pure water produced by the water production unit to the oxygen production unit according to the ship operation working condition, the oxygen demand and the electrical load, and controls the start and stop and the oxygen production of the solid oxygen candle oxygen production module and the electrolyzed water oxygen production module. The oxygen generation mode can be switched according to the operation state of the nuclear energy ship, the solid oxygen candle oxygen generation module is preferentially used for generating oxygen when power is insufficient, and when power is sufficient, the solid oxygen candle oxygen generation module and the solid oxygen candle oxygen generation module are used simultaneously to better meet different navigation requirements.

The invention provides a corn soaking water evaporation system based on corn starch production, and relates to the technical field of corn starch production equipment. The corn soaking water evaporation system based on corn starch production comprises a bottom frame, a bearing plate is fixed to the upper portion of the bottom frame, a storage tank is installed on one side of the bearing plate, a preheating recycling structure is arranged in the storage tank, a cooling tank is installed on the other side of the bearing plate, and a cooling structure is arranged in the cooling tank. And a multi-effect evaporator is arranged in the middle of the bearing plate. According to the corn soaking water evaporation system based on corn starch production, corn soaking water feed liquid can be conveyed into the multi-effect evaporator through the preheating recovery structure, heating evaporation processing can be conducted on the corn soaking water feed liquid, dirt in the feed liquid can be removed in the process, redundant steam can be cooled through the cooling structure, and the cooling effect is good. The evaporation effect on the feed liquid is improved.

The utility model discloses a multi-effect evaporator and a multi-effect evaporation system, and relates to the technical field of chemical treatment, the multi-effect evaporator comprises a plurality of evaporation structures, a connecting structure and a plurality of auxiliary structures, the plurality of evaporation structures are arranged at intervals along the horizontal direction and are sequentially communicated, each evaporation structure comprises a heat exchanger and a separator which are arranged at intervals, and the connecting structure is connected with the auxiliary structures. Each heat exchanger is communicated with the corresponding separator through a communicating pipe, the heat exchangers are used for exchanging heat of steam and materials, the separators are used for flash evaporation of the materials, the connecting structure comprises a plurality of steam pipes and a plurality of material pipes, and each steam pipe is communicated with the upper ends of the separators and the heat exchangers of two adjacent evaporation structures; each material pipe is communicated with the lower ends of the separators and the heat exchangers in the two adjacent evaporation structures, the multiple auxiliary structures are arranged in the multiple heat exchangers respectively, each auxiliary structure comprises an auxiliary pipe extending in the vertical direction, the auxiliary pipes contain steam, and a plurality of air outlet holes are formed in the circumferential side faces of the auxiliary pipes. Through the arrangement, steam and materials can be subjected to sufficient heat exchange, and the evaporation efficiency of the multi-effect evaporator is improved.

A method of extracting nicotine or other alkaloids from an alkaloid-containing feedstock by continuously passing steam around a closed circuit wherein it is alternately contacted with the alkaloid-containing feedstock, and a material capable of capturing the target alkaloid from the steam. By avoiding the need for continuous evaporation and condensation, the energy requirements are vastly reduced compared to classic steam distillation or steam distillation using multi-effect evaporators or mechanical vapor recompression (MVR). Operating at atmospheric pressure improves safety and simplifies equipment construction, while environmental sustainability is achieved by not requiring any solvents, gases, or other chemicals beyond simple acids and bases such as sulfuric acid and calcium hydroxide.

The utility model discloses a vertical multi-effect evaporator which comprises a supporting frame, an evaporator body is fixedly arranged in the supporting frame, a plurality of sets of supporting rods are arranged in a cavity of the evaporator body, heating pipes are arranged among the multiple sets of supporting rods in a surrounding mode, electrodes are arranged on the heating pipes, and a flow dividing cover plate assembly is arranged at the top of the evaporator body. The diversion cover plate assembly comprises a hollow diversion cover plate body, a liquid pipeline and a steam pipeline are arranged at the top of the diversion cover plate body, the liquid pipeline is communicated with a cavity of the diversion cover plate body, and one end of the steam pipeline penetrates through the diversion cover plate body to be arranged at the bottom of the diversion cover plate body. A plurality of groups of shunting pipes communicated with the cavity are uniformly distributed at the bottom of the shunting cover plate main body; the heating and shunting design is ingenious, the heating pipes surround the supporting rods and are heated through the electrodes, the heat transfer efficiency is efficiently improved, the unique shunting cover plate assembly at the top achieves accurate shunting of liquid refrigerants and exporting of steam, and the evaporation efficiency and effect are remarkably improved.

The application discloses a kind of high-efficiency energy-saving multi-effect evaporator system and its use method, belong to multi-effect evaporator technical field.A kind of high-efficiency energy-saving multi-effect evaporator system, including outer cover, further include: first evaporation chamber, second evaporation chamber, third evaporation chamber, all are set in outer cover;Pipe bundle is respectively arranged in first evaporation chamber, second evaporation chamber, third evaporation chamber;Heating gas pipe is connected at the top of first evaporation chamber;Feeding pipe is connected at the top of first evaporation chamber, one end of the feeding pipe is placed in first evaporation chamber and is communicated with pipe bundle;Fixed rod is fixedly connected in the pipe bundle, auger blade is spirally arranged on the fixed rod, turbine blade is rotatably connected to the bottom of the fixed rod, and cleaning rod is arranged on the turbine blade;The application can heat the material more comprehensively, and the heating effect is better, and the crystallization attached to the inner wall of pipe bundle can be cleaned regularly.

The utility model discloses a system for eliminating fresh steam used by an aluminum oxide production hot water tank, which comprises a pipeline system, one end of the pipeline system is connected with a high-temperature condensed water outlet of a last-effect forced evaporator, the other end of the pipeline system is positioned at least 3 meters below the liquid level of the hot water tank, and the last-effect forced evaporator is a last-effect forced evaporator of two groups of multi-effect evaporators. The hot water tank is a washing water heating tank for a filter cake filtered by aluminum hydroxide; the pipeline system of the system introduces high-temperature condensate water of 116 DEG C of the last-effect forced evaporator into the hot water tank, water in the hot water tank can be heated to 92.3 DEG C, the flow is still 190 m < 3 > / h, the washing water requirement and other requirements for filter cakes for aluminum hydroxide filtration are met, new steam does not need to be introduced into the hot water tank for heating, and 3 t of new steam is saved per hour.

The present application relates to the technical field of evaporator, particularly relates to a tower type multi-effect evaporator, which comprises a one-effect evaporator, a two-effect evaporator, a three-effect evaporator, a four-effect evaporator, a raw material preheater and a waste steam condenser built by the same standard module; the heat source input end of the one-effect evaporator is used for connecting with external low-grade steam, the waste steam output end of the one-effect evaporator is connected with the waste steam input end of the two-effect evaporator; the waste steam output end of the two-effect evaporator is connected with the waste steam input end of the three-effect evaporator; the waste steam output end of the three-effect evaporator is connected with the waste steam input end of the four-effect evaporator; the waste steam output end of the four-effect evaporator is connected with the waste steam input end of the raw material preheater, the raw material preheater is used for connecting with raw material to be evaporated, and the raw material is preheated by the waste steam discharged from the four-effect evaporator; the raw material output end of the raw material preheater is connected with the raw material input end of the one-effect evaporator, and the preheated raw material is transported to the one-effect evaporator for evaporation treatment.

The invention belongs to the technical field of industrial waste liquid treatment and recycling, and relates to a urea hydrolyzer waste liquid recycling treatment system and method. The pH value of the waste liquid of the urea hydrolyzer is adjusted to 11.2 + / -0.3 in the pH adjusting water tank, and the temperature of the waste liquid to be treated is adjusted by adopting the urea hydrolyzer. The ammonia-containing gas and the stripped wastewater are separated through the filler stripping tower, and the stripping process of the filler stripping tower depends on the heat of the waste liquid, so that energy conservation and consumption reduction are facilitated. The purity of ammonium sulfate generated by the two-stage sulfuric acid absorption tower is greater than or equal to 99%. Denitrifying nitrogen removal and COD degradation are performed on the waste liquid through the A / O-MBR, and COD degradation is further performed by utilizing the electrocatalytic oxidation reactor. The multi-effect evaporator realizes separation of wastewater into condensate water and a concentrated solution, the condensate water is used for recycling, the concentrated solution is used for crystallization separation of Na2CO3, and full utilization of wastewater resources is realized. According to the method, efficient ammonia nitrogen removal and salt resource recycling of the high-salt waste liquid are achieved, and energy conservation and consumption reduction are facilitated.

The invention relates to the technical field of heat energy engineering and evaporation concentration, and particularly discloses an energy-saving thermal design method of a multi-effect evaporation falling film evaporator. According to the method, collaborative optimization of the operation temperature, the heat transfer area and the feeding path of the system is achieved by building a heat conservation and energy consumption model of the multi-effect evaporator. The method comprises the following steps: collecting raw material parameters, and setting evaporation efficiency and an initial temperature value; establishing a thermodynamic equilibrium equation of each effect; constructing a preheating recovery model to reduce a first-effect heating load; introducing a multi-objective optimization function, taking the total energy consumption of the system, the equipment area and the temperature difference balance as objectives, and combining constraint conditions such as concentration, temperature difference and structure to carry out iterative solution; and a design result is checked and corrected through steam mass conservation and energy closing. The method can be widely applied to design of multiple-effect evaporation systems in the industries of food, pharmacy, chemical engineering and the like, has the advantages of high heat efficiency, low energy consumption, reasonable configuration and the like, and can remarkably reduce the operation cost and improve the industrial adaptability.

This invention discloses a model-based control method for liquid level control in alumina multi-effect evaporators. A universal evaporator liquid level MPC control module can be combined for different evaporation processes to stably and accurately control the liquid level in the multi-effect evaporator. Liquid level control is achieved by setting a liquid level setpoint and corresponding outlet pump frequency or outlet valve opening range. The MPC system intelligently analyzes changes in multiple parameter data to output control data, which is then seamlessly integrated with existing DCS control systems for automatic control. This method considers the interference of changes in evaporation water volume and the flow rate of the evaporating raw material during steam regulation on liquid level control. This invention features a high degree of integration with DCS systems and a high degree of automation, achieving stable and accurate MPC model predictive control of multi-effect evaporator liquid level. This reduces personnel workload and production instability, providing a solid foundation for pursuing automated and intelligent technologies that improve caustic alkali concentration and steam consumption reduction.

The invention relates to a desalting evaporation method for allopurinol, which belongs to the technical field of chemical separation engineering and functional material preparation, and comprises the following steps: mixing fluorine-containing polyaryletherketone or polyimide rigid framework resin, high-temperature-resistant zwitterionic functional modified anti-scaling filler and aprotic polar organic solvent, carrying out ultrasonic dispersion, standing for defoaming, and drying to obtain the allopurinol. A functional coating liquid is obtained; the functional coating liquid is coated on the inner wall of a heat exchange tube of an MVR (mechanical vapor recompression) evaporator or a multi-effect evaporator, and a compact functional coating is constructed on the inner wall of the heat exchange tube by introducing high-temperature-resistant zwitterionic functional modified anti-scaling filler into fluorine-containing polyaryletherketone or polyimide rigid framework resin; the obvious difference is derived from the zwitterionic polymer brush on the surface of the filler, the zwitterionic polymer brush has extremely high hydration capacity in water, and a layer of super-hydrophilic water barrier effect can be formed on the surface of a coating.

The present application relates to a method for treating a glycine dealcoholation mother liquor, comprising the following steps: subjecting the glycine dealcoholation mother liquor to a first-stage multi-effect evaporator for evaporation treatment, recovering the ammonium chloride therein to obtain a first-stage condensed water; adding hydrochloric acid to the first-stage condensed water to adjust the pH value; subjecting the pH-adjusted first-stage condensed water to a second-stage multi-effect evaporator for evaporation treatment, recovering the ammonium chloride therein to obtain a second-stage condensed water; returning the second-stage condensed water to a chloroacetic acid method for producing glycine, and discharging excess second-stage condensed water into a biochemical system; wherein the heating temperature range of the first-stage multi-effect evaporator is 90°C-110°C; and the heating temperature range of the second-stage multi-effect evaporator is 55°C-90°C. The present application provides a method for treating a glycine dealcoholation mother liquor, which can effectively reduce the ammonia nitrogen content and chloride content in glycine wastewater, meeting environmental emission standards and reuse standards.