60results about How to "Prevent scaling" patented technology

This invention relates to a crystallization apparatus for preparing lithium hexafluorophosphate, comprising: a tank body, a feeding device provided on the top surface of the tank body, and an array of heat exchange components provided on the inner wall of the tank body. The heat exchange components include several heat exchange plates disposed on the inner wall of the tank body and arranged along the length of the tank body. This apparatus can increase the heat exchange area and enhance the heat exchange efficiency, enabling the uniform and rapid precipitation of lithium hexafluorophosphate crystals, and achieving continuous production with simultaneous crystallization and scale prevention.

This invention discloses an intelligent heating system for instant water heaters, comprising an inlet water area including an inlet water temperature detection module mounted on an inlet pipe; an outlet water area including an outlet water temperature detection module mounted on an outlet water pipe; and a control module. The signal output terminal of the inlet water temperature detection module is connected to the second signal input terminal of the control module, the signal output terminal of the outlet water temperature detection module is connected to the third signal input terminal of the control module, and the first signal output terminal of the control module is connected to the signal input terminal of a stepper motor drive module. If the outlet water temperature is lower than the preset value, the control module calculates the required water inlet flow based on the difference between the outlet water temperature setpoint and the inlet water temperature to adjust the outlet water temperature to reach the preset value, allowing users to use hot water at the preset temperature and improving the user experience.

The utility model belongs to heat exchange equipment technical field, specifically, relate to a detachable heat exchanger. Detachable heat exchanger includes the pipe box, integral double tube plate and casing by detachable mode coaxial connection in proper order, be provided with U -shaped heat exchange pipe in casing, both ends of U -shaped heat exchange pipe all pass through integral double tube plate and with the inner chamber of pipe box is connected.

The invention relates to the technical field of waste gas recovery and treatment, and discloses five-cycle DMF waste gas recovery equipment which comprises a spray tower body, five stages of spray chambers are arranged in the spray tower body, spray pipes are arranged in the spray chambers, five stages of collection boxes in one-to-one correspondence with the spray pipes are arranged below the spray tower body, and the collection boxes are connected with the spray tower body. The first-stage collecting box is provided with a collecting port, and the fifth-stage collecting box is communicated with a water inlet. According to the five-cycle DMF waste gas recovery equipment and the recovery process, a traditional interstage pumping valve control mode is abandoned, an interstage liquid distribution mechanism for controlling displacement of the flexible flow guide pipe based on rotation of a single driving source is created for the first time, and on the premise that a moving part does not make direct contact with a corrosive medium, the flow guide pipe can be flexibly distributed; accurate countercurrent replacement and dynamic mixing are carried out on the five-stage absorption liquid, and the problems that a pump valve is scaled and blocked and the concentration gradient is out of control due to the high-viscosity DMF waste liquid are thoroughly solved.

The utility model relates to the technical field of evaporation concentration, disclose a kind of low-temperature heat pump evaporator structure, including reaction component, the reaction component includes bearing frame, the top of bearing frame is fixedly connected with reaction kettle, the outer surface of reaction kettle is threadedly connected with sealing cover, the top of sealing cover is sequentially provided with raw material liquid inlet and concentrated liquid outlet, the bottom of reaction kettle is provided with steam exhaust port.The utility model is rotated by servo motor drive drive rod in cleaning component, and then drive stirring rod to carry out forced flow disturbance to raw liquid and the structure operation of synchronous rotation scraping heating pipe outer surface with drive rod as center of circle of cleaning rod, drive the forced flow disturbance of raw liquid, ensure that heat is evenly distributed and accelerate evaporation, while periodically scraping heating pipe outer surface, prevent dirt deposition, realize the beneficial effect of improving heat transfer efficiency and reducing shutdown maintenance frequency.Stirring rod three groups evenly distributed optimize the fluid dynamics performance, avoid to produce dead angle or vortex.

This utility model relates to the field of cooling device technology and discloses a deep water cooling device for a data center reservoir. It includes a bottom plate, with support plates fixedly connected to both sides of the top of the bottom plate. The data center body is installed inside the data center shell. Cooling water coils are installed on both sides and the top of the inner wall of the data center shell. An anti-scaling component, a cooling mechanism, and a water pump are installed in the middle of the top of the bottom plate. A filter component is installed on the left side of the top of the bottom plate, and a water source pipe is installed on the left side of the filter component. By incorporating the filter component and the anti-scaling component, and through the filter screen, multi-stage filtration of the water source can be achieved, removing sediment particles. The anti-scaling component contains cation exchange resin to reduce the content of calcium and magnesium ions in the water source, preventing scaling. This avoids the problems of blockage and scaling inside the cooling device, which affect the cooling effect and the service life of the device.

The present application relates to the technical field of composite defluorination agent, in particular to a composite defluorination agent for semiconductor wastewater, a preparation method and application thereof. The preparation raw materials of the composite defluorination agent include modified activated carbon powder of aluminum chloride, calcium salt, polyaluminum chloride and flocculation synergist. The present application modifies the aluminum chloride and the activated carbon to form a bifunctional powder of chemical chelation and physical adsorption, and meanwhile, the calcium chloride and calcium hydroxide are compounded to form a calcium salt. The calcium salt quickly generates a difficultly soluble fluoride precipitate with the fluoride ion, and the modified activated carbon powder precisely adsorbs the remaining free fluoride ion, thereby solving the problem of incomplete defluorination of a single defluorination agent and poor treatment effect of low-concentration fluorine-containing wastewater. The potassium hexametaphosphate complex wastewater interference ion avoids stealing the defluorination site; the ATMP inhibits the calcium salt from scaling and stabilizes the fluoride precipitate; and the polyhydroxy complex bridged between the precipitate particles and the adsorbent formed by the hydrolysis of the polyaluminum chloride solves the problems of defluorination efficiency decay and slow sludge settling under complex water quality.

A fluctuating steam thermal storage and heat exchange device and method are disclosed. The device includes a tank, a heat exchanger, and a spraying device. The spraying device is located in the upper part of the tank, and the heat exchanger is located in the lower part of the tank. The bottom of the tank is connected to the spraying device via an upper pipe section through an upper circulation inlet, and to the middle of the tank via a lower pipe section through a lower circulation inlet. A circulating water pump is installed on the lifting pipe. A steam inlet is provided on the tank between the spraying device and the lower circulation inlet. This invention also provides a thermal storage and heat exchange method based on this fluctuating steam thermal storage and heat exchange device. This invention can solve the problem of recovering and utilizing intermittent polluted steam, and produces clean, high-temperature secondary water that can be used for power generation or winter heating.

The invention discloses a method for separating and refining fusel oil in Fischer-Tropsch synthesis, and belongs to the technical field of chemical separation. In order to solve the problems of difficult separation and high energy consumption of fusel oil due to the existence of azeotrope, the invention provides a rectification and membrane separation coupled process. The method comprises the following steps: firstly, pretreating a fusel oil raw material through a two-stage rectifying tower, and sequentially removing water, heavy components and light components; then carrying out neutralization desalination treatment on the obtained mixed alcohol solution, and then feeding the mixed alcohol solution into a steam permeable membrane system for deep dehydration to obtain mixed alcohol steam with low water content; and finally, sequentially feeding the dehydrated alcohol steam into a subsequent rectifying tower, and separating to obtain high-purity ethanol, n-propyl alcohol and n-butyl alcohol products. Through energy integration design, high-temperature material flow is used for preheating raw materials and providing a heat source for the rectifying tower, and energy consumption is remarkably reduced. The method is reasonable in process, effectively breaks through the alcohol-water azeotropic limitation, and realizes efficient and low-cost separation of high-added-value components in fusel oil.

The invention belongs to the technical field of power plant indirect cooling circulating water treatment, and relates to an automatic control device and method for the quality of indirect cooling circulating water. Comprising an intelligent control cabinet, an alkali solution tank, an acid solution tank, a mixed ion exchanger, a condenser and an indirect cooling tower aluminum heat exchanger, a conductivity meter, a pH meter and a PLC (Programmable Logic Controller) are arranged in the intelligent control cabinet; the alkali solution tank is connected with a circulating water inlet pipeline; the acid solution tank is connected with a circulating water inlet pipeline; a pH electrode is arranged on the circulating water inlet pipeline; a conductivity electrode is arranged on the circulating water outlet pipeline; the condenser inlet is connected with the circulating water outlet pipeline; the condenser outlet is connected with the circulating water inlet pipeline; the circulating water outlet pipeline is connected with an inlet of the mixed ion exchanger; an outlet of the mixed ion exchanger is connected with an inlet of the condenser. According to the invention, accurate control of the water quality pH value and conductivity of the intercooling circulating water can be realized, so that system corrosion is effectively inhibited, the service life of equipment is prolonged, and safe and economical operation of a unit is guaranteed.

The present application belongs to the field of chemical industry, and particularly relates to a method for inhibiting the scaling of a first effect heat exchanger in the evaporation and concentration process of sulfuric acid method titanium dioxide waste acid. The titanium dioxide waste acid is sent into a multi-effect evaporation and concentration system, and the feature is that only the circulating acid returned from the first effect concentration is sent into the first effect heat exchanger for heating, and the feeding position of fresh titanium dioxide waste acid is set at the rear end of the first effect heat exchanger outlet, so as to avoid the mixing of the circulating acid and the fresh titanium dioxide waste acid and then entering the first effect heat exchanger. The fresh titanium dioxide waste acid is mixed with the circulating acid flowing out of the heat exchanger after being heated, and the mixed acid is sent into an evaporation chamber for evaporation and concentration. The feeding temperature of the fresh titanium dioxide waste acid mixed with the circulating acid is 10-110 DEG C.

This utility model provides a reaction crystallization kettle for preparing cryolite from fluoride-containing wastewater, relating to the field of reaction crystallization kettle technology. It includes: a shell, a stirring device and a material distribution structure at the lower end of the shell, a wire mesh in the middle of the shell, and an ultrasonic generator at the upper end of the shell. The stirring shaft of the stirring device is hollow, with a first feed inlet at the lower end of the stirring shaft. The material distribution structure forms a second feed inlet on the lower side wall of the shell. The upper side wall and bottom wall of the shell are respectively provided with a mother liquor outlet and a crystal slurry outlet. This invention solves the problems of poor reaction efficiency and equipment scaling in the current process of preparing cryolite from fluoride-containing wastewater.

The utility model discloses a kind of ammonia desulfurization device flue gas water washing system heat recycling system, including desulfurization tower, air blower room, gas-water heat exchanger, air preheater and boiler;The washing water outlet of desulfurization tower is communicated with the water inlet of water washing circulating tank by pipeline, the water outlet of water washing circulating tank is divided into two ways, one way is communicated with the hot medium import of gas-water heat exchanger by pipeline, another way is communicated with the import of water washing circulating pump by pipeline, the outlet of water washing circulating pump and the hot medium import of gas-water heat exchanger are all communicated with the washing water import of desulfurization tower by pipeline;The cold medium import of gas-water heat exchanger is communicated with atmosphere, the cold medium outlet of gas-water heat exchanger is communicated with the outdoor suction inlet of the inlet pipeline of air blower room by pipeline.The advantage is that: using the low-lying heat energy of desulfurization tower high-temperature washing water to heat boiler air blower inlet air, reduce steam consumption, reduce the energy consumption and operating cost of device, meet the industrial demand of energy saving and consumption reduction.

The invention relates to a water vapor-organic working medium combined cycle power generation system which comprises a water vapor Rankine cycle and an organic working medium Rankine cycle, saturated steam generated by a boiler forms superheated steam through a superheater and drags a steam turbine generator to generate power, steam exhausted by a steam turbine is condensed in a condenser, and formed condensed water returns to the boiler through a water feeding pump and an economizer. A liquid organic working medium passes through an organic working medium booster pump, an organic working medium heater and a condenser to form organic working medium superheated steam, an organic working medium gas turbine generator set is dragged to generate electricity, and exhaust gas of an organic working medium gas turbine is cooled through the condenser to form the liquid organic working medium. And high-temperature flue gas generated in the fuel combustion or industrial production process is discharged after being cooled by the boiler body, the superheater, the economizer and the organic working medium heater, or is discharged from a chimney through purification equipment and an induced draft fan.

The utility model relates to the technical field of cooking utensils, in particular to a steaming and baking oven, in the working state of the steaming and baking oven, a steaming and baking oven inner container is filled with a large amount of heating steam and used for heating food materials to be steamed and baked, and the steaming and baking oven comprises the steaming and baking oven inner container and a steam collecting device; the steam collecting device comprises a steam collecting cover and a backflow box; the steam collecting cover is communicated with the backflow box through a flow guide piece; the steam collecting cover is arranged in the inner container of the steaming and baking oven, and heating steam can be condensed into liquid after making contact with the condensing face of the steam collecting cover and then flows into the backflow box through the flow guide piece along the outer wall of the steam collecting cover. The steam collecting device is arranged in the inner container of the steaming and baking box, so that heating steam can be collected into the backflow box, the phenomenon that scale is generated in the inner container of the steaming and baking box is avoided, and the tidiness of the inner wall of the inner container of the steaming and baking box is improved.

The utility model discloses a methanol recovery and waste water cyclic utilization device in MTBE production, and relates to the technical field of MTBE production, the methanol recovery and waste water cyclic utilization device comprises a distillation box, a box cover is detachably mounted on the top surface of the distillation box, a plurality of movable rods are slidably mounted in the box cover, the lower ends of the movable rods are connected with an annular heating plate, and the annular heating plate is connected with the distillation box. A lifting plate is connected to the upper ends of the multiple movable rods, a stirring assembly penetrating through an inner cavity of the distillation box is arranged on the top face of the lifting plate, a connecting column is fixedly installed at the upper end of the lifting plate, a lifting frame is fixedly installed at the upper end of the connecting column, and a driving assembly used for driving the lifting frame to ascend and descend is installed on one side of the box cover. According to the utility model, the lifting plate can be driven to lift through the driving assembly, so that the stirring assembly and the annular heating plate can change the acted water layer, and different water layers of wastewater in the distillation box are uniformly heated, thereby ensuring the methanol distillation effect.

The invention relates to the technical field of solvent extraction, and discloses a rare ginsenoside extraction device and a rare ginsenoside extraction process, the rare ginsenoside extraction device comprises an evaporation concentration assembly, a gas-liquid separator, a condensation assembly and a condensate receiving tank which are communicated in sequence; according to the invention, the conical dispersion cylinder realizes uniform distribution of total cross section of steam, avoids the problems of vibration and bias flow caused by direct flushing of the steam to the tube plate, greatly improves the utilization rate and condensation efficiency of the heat exchange tube, and stabilizes the vacuum degree of the system; a two-stage interception structure of front gas-liquid separation matched with secondary defoaming of a gas inlet cavity effectively prevents rare ginsenoside entrainment from running away along with steam and adhering to the inner wall of a condensation pipe to scale, and a closed-loop reflux structure is matched to realize full-amount recovery of effective components, so that the product yield is increased; the whole-process closed vacuum communication design is adopted, external air is isolated in the whole process, the oxidative degradation risk of rare ginsenoside is reduced, meanwhile, low-temperature concentration can be achieved in the vacuum environment, the thermal degradation probability of target components is reduced, and the product activity is guaranteed.

The utility model discloses a kind of probiotic high-efficiency fermentation devices, it relates to probiotic processing technical field, including fermentation tank, the side of the fermentation tank is provided with mounting box, the side of the mounting box is provided with motor one, the inside of the mounting box is provided with gear one and gear two, gear one and gear two far from the end of motor one are evenly provided with crushing cylinder.The utility model is crushed into powder by rotating crushing cylinder to lumpy or massive probiotic raw materials, by the baffle provided can prevent probiotic raw materials from falling in the two sides of two crushing cylinders during feeding process, avoid some probiotic raw materials do not participate in crushing process, by starting motor two drives rotating rod to rotate, and then stirring rod, stirring vane will rotate, rotating stirring vane will mix and stir probiotic raw materials and fermentation broth on filter plate, rotating stirring rod can continuously stir and mix sludge accumulated in the middle of fermentation tank, ensure the mixing of raw materials and fermentation broth.

This invention discloses a high-efficiency evaporation device for concentrated brine treatment, belonging to the field of industrial wastewater treatment technology. The device includes an injection port, nested inner and outer spiral tube assemblies, and a straight pipe connecting the two. The inner spiral tube employs a tapered structure to accelerate the spiral descent of the liquid, while the outer spiral tube, driven by a corrugated guide channel and an air pump, achieves the spiral ascent of the liquid, forming a counter-current gas-liquid contact. A double-spiral heating copper tube is installed in the gas chamber to directly heat the descending cold air to 80-100°C, which is then uniformly released into the liquid chamber through porous ceramic through-holes to agitate the concentrated brine. The injection port extension pipe integrates a plate heat exchanger, utilizing the waste heat of the discharged gas to preheat the incoming liquid, achieving cascaded utilization of thermal energy.

The utility model relates to industrial boiler water quality detection technical field, is a kind of boiler water quality monitoring device, it includes first sample cup, pH value detection equipment, calibration column, phosphate radical analyzer, conductivity detection equipment, sodium ion detection equipment, first sample cup, pH value detection equipment import respectively fixed intercommunication have first, second sampling pipeline, fixed intercommunication have sample pipeline between first sample cup and calibration column, fixed intercommunication have reagent pipeline between reagent tank and calibration column, fixed intercommunication have mixed solution pipeline between calibration column export and phosphate radical analyzer, sample pipeline, reagent pipeline, mixed solution pipeline, desalted water pipeline are respectively installed with peristaltic pump. The utility model is reasonable and compact, convenient to use, its operation time is controlled to peristaltic pump by PLC controller, and each detection equipment's digital display screen is monitored in real time by online monitoring camera, reach the purpose of on-line detection boiler water quality, with safe, labor-saving, simple, efficient characteristics.

The invention discloses a plate type falling film evaporator. The evaporator comprises an evaporator tank body, a feed liquid evaporation plate device, a feed liquid distribution device, a feed liquid circulating device, a steam discharging device and a feeding pipeline, the feed liquid evaporation plate device comprises an evaporation plate mechanism, a fixed bracket, a descaling connecting frame and a descaling metal strip; a liquid film evaporation area is formed through the feed liquid evaporation plate device, uniform liquid distribution is achieved through the feed liquid distribution device, non-evaporated feed liquid flows back through the feed liquid circulation device, secondary steam is discharged through the steam discharging device, and raw materials are supplemented through the feeding pipeline; the thermal expansion coefficient of the descaling metal strip is larger than that of the evaporation plate mechanism, micro displacement is generated during heating or the descaling metal strip abuts against and slides to disturb the plate face, scale layer attachment is damaged, the scale layer is promoted to fall off, automatic reset is achieved during cooling, and self-adaptive descaling without external force driving is achieved. Passive scale removal is achieved through the thermal expansion difference, the heat transfer efficiency is improved, the operation period is prolonged, and the cleaning frequency and the maintenance cost are reduced.

The invention provides a reaction process device and a feeding device and a parameter optimization method thereof. Wherein the feeding device comprises a feeding pipeline, an annular pipeline and at least two spiral nozzles; the feeding pipeline comprises a main feeding branch pipe and at least two branch flow dividing branch pipes, the main feeding branch pipe is communicated with the annular pipeline through the branch flow dividing branch pipes, and the spiral nozzles are distributed on the annular pipeline in a scattered mode. According to the invention, uniform material flow distribution can be ensured, the dispersion uniformity of the material liquid on the cross section of the reaction kettle is enhanced, and scaling caused by excessive accumulation of local materials in the reaction kettle is prevented. The smooth flow channel design of the spiral nozzle and the high liquid speed in the channel can reduce the scaling and blocking probability of the feeding pipeline to a certain extent.

The utility model discloses a kind of desalted water cooling adjusting devices, including desalted water cooling device, desalted water regulating water tank, water inlet pipe and water outlet pipe, the shell side import of high-efficiency cooler is communicated by second pipeline with the pipe side import of desalted water cooling device, the shell side export of high-efficiency cooler is communicated by first pipeline with the lower end of desalted water regulating water tank, the pipe side export of desalted water regulating water tank is communicated with the lower end of desalted water cooling device by pipeline assembly, water inlet pipe and the shell side import of desalted water cooling device are communicated, water outlet pipe and the shell side export of desalted water cooling device are communicated, the utility model is cooled to sample water by desalted water circulation, industrial water is as desalted water in and out and realizes circulation, ensure that sample water is cooled to 20-30 ℃, satisfy the strict requirement of on-line monitoring equipment to sample water temperature.

The utility model discloses a kind of water vending machines, it is related to water vending machine technical field, comprising: soft water purification system, it at least includes by pp filter element, activated carbon filter element and RO filter element;Hydrogen-rich system, it includes low TDS pure water tank and PEM electrolyzer, resin filter element is connected in series in the pipe line fixedly communicated between the water outlet of low TDS pure water tank and the inlet and outlet of PEM electrolyzer;Wherein, the water inlet of low TDS pure water tank is connected with the water outlet of RO filter element;The oxygen outlet of PEM electrolyzer is fixedly communicated with the inlet of low TDS pure water tank;It further includes hydrogen mixing jet device.The utility model is in PEM electrolyzer water inlet end series resin filter element, depth adsorption softening after residual ion and organic impurity, from source head, block pollutant contact electrode, guarantee electrolytic cell long-term efficient operation, second electrolysis generated pure hydrogen is transported to hydrogen mixing jet device by independent pipe line, with multi-stage purification after soft water high-efficiency fusion, prevent secondary pollution risk.

The utility model discloses a pretreatment device and a kitchen waste treatment system. The pretreatment device comprises an impurity removal unit, an adjusting unit and a sand discharge unit, the impurity removal unit is provided with an impurity removal inlet end and an impurity removal outlet end and is used for removing settled sand; the adjusting unit is provided with an adjusting cavity, and the adjusting cavity is communicated with the impurity removal outlet end and is provided with a discharge hole communicated with the anaerobic device; the sand discharging unit comprises a stirring structure, an output pipe and a pump body, the stirring structure is arranged on the adjusting unit and located at the bottom of the adjusting cavity, the liquid outlet end of the output pipe communicates with the impurity removal inlet end, the liquid inlet end of the output pipe communicates with the bottom of the adjusting cavity, and the pump body is arranged on the output pipe. According to the pretreatment device in the scheme, non-stop cleaning of accumulated materials at the bottom of the adjusting unit can be achieved, the treatment efficiency of kitchen waste is improved, recycling of the cleaned materials is achieved, and therefore the recycling rate of the kitchen waste is increased.

The invention relates to the technical field of olefin polymerization post-treatment, and particularly provides a post-treatment system and a post-treatment method of an ethylene oligomerization process. The post-treatment method of the ethylene oligomerization process comprises the following steps: preheating a product from an ethylene oligomerization reactor, carrying out flash evaporation to obtain a gas phase rich in ethylene and a liquid phase containing a byproduct polymer, condensing and separating the gas phase rich in ethylene to obtain first recovered ethylene and first condensate, and carrying out secondary recovery on the first recovered ethylene and the first condensate, the liquid phase containing the byproduct polymer and the first condensate are fed into an ethylene recovery rectification unit to be rectified, the heavy component material is fed into a heavy component separation unit to be separated, a target fraction and heavy component residual liquid containing the byproduct polymer are obtained, the product from the ethylene oligomerization reactor is preheated before entering the heavy component separation unit, and the byproduct polymer is recycled. And controlling the temperature of pipeline equipment flowing through to be 90 DEG C or above. The post-treatment system and the post-treatment method for the ethylene oligomerization process provided by the invention are used for removing a byproduct polymer and recovering unreacted ethylene.

The invention discloses a screw conveyer adopting a reinforced shaftless screw blade, and relates to a screw conveyer. The spiral conveyor is provided with a barrel, a spiral blade is arranged in the barrel, the front end of the barrel is connected with a driver, the front end of the barrel is further provided with a feeding port, the rear end of the barrel is provided with a discharging port, and the spiral conveyor is characterized in that the spiral blade in the barrel is a reinforced shaftless spiral blade, the input end of the reinforced shaftless spiral blade is connected with the driver, and the output end of the reinforced shaftless spiral blade is connected with the discharging port. The output end of the reinforced shaftless spiral blade is connected with a coupler on the cylinder body, the reinforced shaftless spiral blade is provided with a reinforcing rib on a spiral blade of the shaftless spiral blade, and the reinforcing rib is a through rib or a short rib or a combination of the through rib and the short rib. The spiral conveyor has the advantages that various types of materials can be conveyed, and the conveying capacity is high; the deformation of the spiral blade during working is small; materials can be automatically stir-fried in the working process; scales on the spiral blade and the barrel or the inner wall of the pipeline are less; the friction wear of the spiral blade is small, and the service life is long; the popularization value is realized.

The invention relates to the technical field of seawater desalination, in particular to a hot film coupling seawater desalination pipeline system and a control method thereof. The pipeline system comprises a reverse osmosis system, a distillation system, a seawater supply pipe and a three-way valve; the seawater supply pipe is divided into a first branch pipe and a second branch pipe; a first straight-through opening of the first three-way valve is connected with the first branch pipe, and a second straight-through opening is connected with a seawater opening of the reverse osmosis system; a third straight-through port of the second three-way valve is connected with a second branch pipe, a fourth straight-through port is connected with a cooling water inlet of the distillation system, and a second angular port is connected with a concentrated water port of the reverse osmosis system; a cooling water outlet of the distillation system is connected with a first angle port of the first three-way valve and a third angle port of the third three-way valve; a fifth straight-through port of the third three-way valve is connected with a concentrated water port of the reverse osmosis system, and a sixth straight-through port is connected with a concentrated water discharge pipe. According to the invention, the complexity and fault points of the control system are reduced.

The application discloses a nitromethane continuous distillation device, and relates to the technical field of nitromethane separation.The application has the advantages that the distillation device body is provided with an outer cylinder and an inner cylinder connected in sequence from the outside to the inside at the rear end of the distillation device body, a jacket is connected to the outer wall of the outer cylinder, and a hollow roller shaft is rotatably connected to the inner wall of a through hole in the middle of the distillation device body.The device adopts a double heating mode, significantly improves the uniformity of material heating, continuously rotates an auger to push the axial transmission of the material, realizes continuous feeding, continuous distillation and continuous discharging, and the spiral blades rotate synchronously with the inner cylinder to continuously scrape off the impurities on the inner wall of the outer cylinder, so that the heat conduction surface is kept clean and uniform, and the product purity and production stability are improved.The application effectively solves the problems of low intermittent operation efficiency, uneven heating and inner wall scaling of the existing nitromethane distillation device, realizes the continuous production of nitromethane, and has important industrial application value.

The application relates to a method for preparing high-purity calcium fluoride by fluorine-containing wastewater resource treatment, which comprises the following steps: step 1: taking calcium fluoride as a core, coating an active calcium-based compound on the surface to form a core-shell structure composite seed HAP / CaF2; step 2: adding fluorine-containing wastewater into a stirring kettle, adjusting pH=5-8, adding the composite seed HAP / CaF2, starting stirring to uniformly disperse the seed, adopting a mode of adding calcium hydroxide solution in sections to carry out a crystallization reaction, controlling the Ca / F molar ratio and stirring intensity in different stages to maintain the supersaturation of the reaction system in a metastable zone interval, and inducing calcium fluoride to grow on the surface of the composite seed in a directional mode; step 3: after the crystallization reaction is completed, the reaction liquid is subjected to solid-liquid separation to obtain crude calcium fluoride crystals and a filtrate; and step 4: adding the crude calcium fluoride crystals into HF and washing until neutral, and the product is obtained. The method fundamentally solves the uncontrollable problem in the calcium fluoride crystallization process, greatly improves the product purity and fluorine resource recovery rate, and significantly reduces equipment investment and operation cost.