865results about "Multiple-effect evaporation" patented technology

An eFuels plant and process for producing synthetic hydrocarbons using renewable energy are disclosed. The eFuels plant comprises a hydrocarbon synthesis (HS) system and a renewable feed and carbon / energy recovery (RFCER) system. The RFCER comprises an electrolysis unit to convert water to hydrogen and oxygen. The hydrogen and carbon dioxide are fed to the HS system to produce synthetic hydrocarbon products. The process further comprises a thermal desalination unit, a direct air capture unit, an oxygen-fired heater, a steam turbine generator, a heat recovery unit, anaerobic and / or aerobic wastewater treatment, or a combination thereof. Process streams of and heat generated in the HS and RFCER systems are integrated to improve energy, hydrogen, and carbon efficiency and maintain stable operations during power fluctuations to the eFuels plant.

The invention relates to the technical field of PLC linkage control, in particular to a multi-effect evaporator set and a PLC linkage control method thereof.The method comprises the steps that data of all kinds of evaporation parameters in all time periods in the operation process of the multi-effect evaporator set are obtained, and all parameter data sequences are formed; obtaining the standard floating stability of the evaporation parameters in each time period, and obtaining the overshoot optimization quantity and oscillation effect adjacency of the evaporation parameters in each time period; optimizing a dynamic proportion parameter, a dynamic integral parameter and a dynamic differential parameter of each evaporation parameter in the next time period based on the dynamic proportion parameter, the dynamic integral parameter and the dynamic differential parameter; and performing PLC linkage control on the multi-effect evaporator group by adopting a PID algorithm through the optimized dynamic proportion parameter, dynamic integral parameter and dynamic differential parameter. The operation state of the multi-effect evaporator can be accurately controlled.

The invention discloses a BOE waste liquid treatment method and device. The method comprises the following steps: replacing hydrogen fluoride in BOE waste liquid with sulfuric acid, evaporating, fractionating and recovering hydrofluoric acid, neutralizing evaporated residual liquid with ammonia to obtain a fluorine-containing ammonium sulfate solution, defluorinating with fluorgypsum slurry to obtain a low-fluorine ammonium sulfate solution, and concentrating and crystallizing to obtain an ammonium sulfate product. The BOE waste liquid is treated by adopting the scheme, the bottleneck of the market capacity of ammonium bifluoride is avoided, the hydrofluoric acid product and the ammonium sulfate product with huge market capacity are produced, the value orientation of turning waste into wealth, circular economy and environmental protection is really realized, and the method is suitable for industrial popularization and application.

The present application provides a citric acid evaporation concentration crystallization device and method, including a feed tank, a condensed water heat exchanger, a fresh steam heat exchanger, a first-effect evaporator, a first-effect separator, a second-effect evaporator, a second-effect separator, a third-effect evaporator, a third-effect separator, an intermediate storage tank, an FC crystallizer, a crystallization heat exchanger, a centrifuge and a mother liquid tank connected in sequence through pipelines, the feed port of the feed tank is connected to the workshop storage system; the steam outlet of the first-effect evaporator and the steam outlet of the first-effect separator are connected to the steam ejector; the FC crystallizer and the crystallization heat exchanger are connected through pipelines to form a circulating evaporation crystallization system. The system of the device operates in a negative pressure system, using steam ejection technology, multi-effect evaporation technology, and MVR evaporation technology, reducing the operating energy consumption to 22% of the original system, the system operates stably, has high thermal efficiency, and the crystal content of crystals below 200 mesh precipitated by the crystallization system is increased by more than 30%.

The invention provides an intelligent dynamic flow rate regulation and double-effect crystallization evaporation device which comprises a feeding system, a double-effect evaporation system, a crystallization system, a circulating pump and a flow rate regulation system, the feeding system is connected to the double-effect evaporation system through a pipeline, the double-effect evaporation system is connected to the crystallization system through the circulating pump, and the flow rate regulation system is connected to the crystallization system through a pipeline. The flow rate adjusting system is connected with the circulating pump and the double-effect evaporation system, and the device realizes intelligent dynamic flow rate adjustment through the circulating closed-loop control system, so that the evaporation efficiency and the crystallization quality are optimized. The circulating closed-loop control system comprises a data acquisition unit, a data processing unit, a flow velocity adjusting system, a feedback optimization unit and an abnormity early warning unit, a flow velocity adjusting strategy is optimized based on real-time data, historical data and machine learning, scaling is reduced through disturbance flow velocity control, and the system stability is improved. The evaporation and crystallization efficiency is improved, the energy consumption is reduced, different working condition requirements are met, and the method is suitable for the field of industrial evaporation and crystallization.

Disclosed in the present invention are an amine liquid purification and regeneration system and method. The system comprises a feeding pipeline for an amine liquid to be purified, a vacuum gas-stripping evaporation tank, a vacuum condenser, a vacuumizing unit and an amine liquid tank, wherein an inlet for an amine liquid to be purified, a recovered gas outlet and a discharge liquid outlet are provided on the vacuum gas-stripping evaporation tank; the feeding pipe for an amine liquid to be purified is connected to the inlet for an amine liquid to be purified; the recovered gas outlet is located at the top of the vacuum gas-stripping evaporation tank and is connected to the amine liquid tank, and the vacuum condenser is arranged on the connecting pipeline; the vacuumizing unit is in communication with the top of the vacuum condenser or the amine liquid tank; and an amine liquid stripping tower is also provided before the vacuum gas-stripping evaporation tank. The system has low waste liquid discharge, high amine recovery rate and thorough removal of heat-stable salts, and can ensure stable operation of a CO2 capture system.

The invention relates to a nylon 6 polymerization production method capable of fully recycling extractable oligomers, and relates to the technical field of nylon 6 polymerization production processes, the nylon 6 polymerization production method comprises a nylon 6 polymerization section, a nylon 6 slice extraction section, a nylon 6 wet slice drying section, an extract evaporation and concentration section and an extractable oligomer cracking and recycling section; in an extractable oligomer cracking and recycling section, by adjusting process conditions such as temperature, pressure and water content of an oligomer extraction concentrated solution, deep cracking of extractable substances is realized, and all cracking products can be recycled into a polymerization section for recycling, so that rapid accumulation of cyclic dimers in polymers is inhibited, no residues are generated in the polymerization process, and the production cost is reduced. Accumulation of cyclic dimers in a system can be effectively slowed down, the service life of a polymerization reactor is prolonged, and the quality of polymer products is improved.

The invention relates to the field of enhanced intrinsic safety in a gas-liquid phase mixing process, and discloses a gas-liquid mixing device and a gas-liquid mixing vaporization method. The device comprises a shell, a Venturi gas-phase turbulent mixing section, a liquid-phase atomizing mixing section and a static mixing section are sequentially arranged in the shell in the flowing direction of material flow, the Venturi gas-phase turbulent mixing section comprises a reducing structure and an expanding structure, a liquid inlet component is arranged at the position, close to the reducing structure, of the expanding structure, and the static mixing section is connected with the liquid inlet component. The liquid phase atomization mixing section is provided with a membrane tube base body, the membrane tube base body is provided with a plurality of inner holes in the axial direction, the surfaces of the inner holes are coated with nanometer materials, and the static mixing section is provided with filler. According to the device, the liquid-phase oxidizing agent and the gas-phase oxidizing agent are subjected to multi-stage mixing vaporization, the atomization degree of the liquid phase is increased, the uniformity degree of the obtained mixed gas phase is improved, meanwhile, the device can be quenched after burning explosion by coupling a porous membrane pipe and filler, and the burning explosion risk in the mixing vaporization process is reduced.

The invention relates to the technical field of vacuum concentration, in particular to double-effect vacuum concentration equipment, mainly aims to solve the problems that in the prior art, the evaporation rate is low, energy loss is large, nutritional ingredients in materials are prone to being damaged, and the flavor and taste of the materials are difficult to guarantee, and adopts the following technical scheme that the double-effect vacuum concentration equipment comprises a feeding pipe, a first-effect heater is arranged outside the first-effect circulating pipe, a first-effect evaporation chamber is arranged on the side, away from the first-effect heater, of the first-effect circulating pipe, a first-effect upper pipe box outlet is formed outside the first-effect heater, and the first-effect upper pipe box outlet is communicated with the first-effect evaporation chamber; the external heating forced circulation evaporation mode is adopted, the evaporation speed is high, the concentration ratio is large and can reach 1.3 (common traditional Chinese medicine extract), two-effect simultaneous evaporation is adopted in the concentrator, secondary steam is fully used, boiler investment is saved, energy consumption is reduced, and compared with other evaporators, the energy consumption is reduced by 40%.

The invention relates to the technical field of seawater desalination, and particularly provides an effect body evaporator, a low-temperature multi-effect distillation seawater desalination system and a low-temperature multi-effect distillation seawater desalination method. When the steam extraction circulating unit extracts steam, the opening degree of a flexible communicating hole in the double-flow-channel heat exchange pipe is gradually increased, so that most of steam entering the heat exchange pipe flows to an intermediate-effect evaporator through a main flow channel; and under the condition that the flow of the steam received by the first-effect evaporator is reduced, the flexible communication hole is gradually reduced, so that most of the steam entering the heat exchange pipe is subjected to heat exchange through the auxiliary flow channel under the action of the steam extraction pressure difference, and therefore, efficient utilization and heat energy recovery of the steam in the low-temperature multi-effect distillation seawater desalination system are realized, and the energy consumption is reduced. And meanwhile, scaling of the outer wall of the heat exchange tube of the first-effect evaporator due to the fact that the heat exchange tube bears the relatively unstable steam change condition can be effectively prevented, and scaling and cleaning difficulty of the first-effect heat exchange tube bundle are greatly reduced.

The utility model discloses a double-tower falling-film evaporator set, which belongs to the technical field of evaporator equipment and comprises a heating evaporation tank, a replacement component is arranged at the top of the heating evaporation tank, feed liquid can be fed more uniformly, heat pipes can be replaced and overhauled conveniently, evaporated liquid and steam are separated by a separator, and the heat pipes can be replaced and overhauled conveniently. Steam is introduced into the heating evaporation tank to serve as a heating medium through a secondary steam outlet in the upper portion of the separator, multi-effect operation is achieved, the energy utilization rate is increased, the heating steam inlet is mainly used for providing heat energy needed by evaporation, and the condensate water outlet is used for discharging water formed by condensation of the heating steam after heat transfer. The mounting slots correspond to the bottoms of the partition plates, so that the mounting stability of the partition plates is ensured, and meanwhile, internal media can be discharged in time through the treatment opening and the concentrated solution outlet.

The systems of the present disclosure include a solar-powered steam Rankine cycle (SRC) subsystem to convert solar energy into thermal energy and store the thermal energy; an ejector refrigeration cycle (ERC) subsystem to provide a first refrigeration effect with a first range of temperature based on the thermal energy; an absorption refrigeration cycle (ARC) subsystem to provide a second refrigeration effect with a second range of temperature based on the thermal energy; a brine refrigeration cycle (BRC) subsystem to generate and store when there is no cooling demand and provide a third refrigeration effect with a third range of temperature based on the electrical power generated by the ERC subsystem and the ice being melted; and an adsorption refrigeration cycle (ADRC) subsystem to provide a fourth refrigeration effect with a fourth range of temperature based on the thermal energy.

The utility model belongs to the field of wastewater treatment, in particular relates to multi-effect evaporative crystallization wastewater treatment and recovery equipment, and provides the following scheme aiming at the problems that the contact time with steam is difficult to adjust according to wastewater with different concentrations and the concentration process of the wastewater is inconvenient to manage more effectively in the multi-effect evaporative crystallization wastewater treatment and recovery equipment in the prior art. The device comprises a plurality of evaporators, each evaporator comprises a tank body, a liquid inlet end and an air inlet end are arranged on one side of the outer wall of each tank body, a liquid conveying end is arranged at the bottom end of each tank body, and an air outlet end is arranged on the other side of the outer wall of each tank body; the multiple sets of threaded pipes are used for prolonging the contact time of the wastewater and steam, water is gradually evaporated to form steam, solute is gradually concentrated, the steam and the concentrated wastewater enter the next evaporator, harmful substances in the wastewater are effectively separated out in the evaporation and crystallization process, and pollution to the environment is reduced.

The invention belongs to the technical field of impurity separation, and particularly discloses a method for separating and purifying impurities in a process for preparing glyoxylic acid through oxalic acid electrolysis, a crystallization kettle is included, an isolation device is arranged in the crystallization kettle, and the isolation device comprises a conical top cover, a conveying pipe, an annular filter screen, a directional conveying assembly and a sealing assembly; the conical top cover is arranged at the axis of the crystallization kettle, an opening of the conical top cover faces downwards, and a plurality of fixing rods are fixedly connected between the top of the conical top cover and the inner wall of the side face of the crystallization kettle. According to the method, glyoxylic acid product solutions with different concentration specifications and the high-purity glyoxylic acid crystal can be obtained after the electrolyte is sequentially subjected to pre-evaporation, electrodialysis, secondary evaporation, cooling crystallization, solid-liquid separation, washing and drying and other procedures, so that the prepared high-purity glyoxylic acid crystal can be popularized and applied in the field of high-end medicine.

The utility model belongs to the technical field of adipic acid production, and particularly relates to an efficient energy-saving device of a nitric acid concentration tower in adipic acid production, which comprises a 1 # concentration tower, a first reboiler, a 2 # concentration tower, a second reboiler, a third reboiler, a condensate collecting tank, a wastewater collecting tank and an oxidized acid storage tank, each of the first reboiler, the second reboiler and the third reboiler comprises a shell pass pipeline and a tube pass pipeline; three branches, namely a first branch, a second branch and a third branch, are arranged at the outlet end of the bottom of the 1 # concentration tower; the first branch is communicated with an inlet end at the upper part of the second concentration tower, and the second branch is communicated with a tube pass inlet end at the bottom of the first reboiler. According to the utility model, the gas phase of the 1 # concentration tower can be pressurized and heated by utilizing the roots pump, and the 1 # concentration tower is heated and evaporated by additionally arranging a group of reboilers, namely, steam consumption is reduced by utilizing conversion and replacement of electric energy, and energy conservation and consumption reduction are realized.

The utility model relates to the technical field of hydrochloric acid desorption, in particular to a hydrochloric acid desorption device which comprises a hydrochloric acid desorption tower, and the top of the hydrochloric acid desorption tower is sequentially communicated with a primary condensing device, a secondary condensing device, a freezing device, a demister and a hydrogen chloride buffer tank; one side wall of the hydrochloric acid desorption tower is communicated with a hydrochloric acid storage tank; the side wall of the hydrochloric acid desorption tower is also communicated with a calcium chloride solution storage tank; a bottom liquid outlet of the hydrochloric acid desorption tower is communicated with a first inlet of the thermosyphon reboiler, the thermosyphon reboiler is provided with a first outlet and a second outlet, the first outlet is communicated with a liquid inlet of the hydrochloric acid desorption tower, and the second outlet is sequentially communicated with the multi-effect evaporation device and the flash separation tank; and the flash separation tank is respectively communicated with a calcium chloride solution storage tank and a second inlet of the thermosyphon type reboiler. According to the utility model, the equipment investment is reduced, the concentration efficiency of the calcium chloride solution is improved, the energy consumption is reduced, and calcium chloride is prevented from flowing back into the desorption tower to cause blockage.

The utility model relates to a system for preparing high-purity inositol using corn slurry, the system comprising a precipitation tank, a first plate-frame filter, a fitin dissolving tank, an enzymolysis tank, a neutralization tank, a second plate-frame filter, a nanofiltration system, a first evaporator, a decolorizing tank, an ion exchange column, a second evaporator, a first crystallization kettle, a first centrifuge, a crude product dissolving tank, a second crystallization kettle, a second centrifuge, a hot air drying tank and a cold air fluidized bed connected sequentially by pipelines, a feed inlet of corn supernatant and a feed inlet of lime milk suspension are respectively arranged on the precipitation tank, a feed inlet of dilute hydrochloric acid solution is arranged on the fitin dissolving tank, and the material coming out of the discharge end of the cold air fluidized bed is the required inositol crystal product. The utility model can quickly obtain enzymolysis raw material liquid phytic acid, and compared with calcium phytate suspension, the homogeneity of the liquid phytic acid enzymolysis process system is improved, the enzymolysis conversion rate is increased to more than 98%, and the purity of the inositol crystal product is increased to more than 99.5%.

The demister cleaning device comprises a first-effect evaporation module, a second-effect evaporation module, a third-effect evaporation module and a feeding pipe, the first-effect evaporation module, the second-effect evaporation module and the third-effect evaporation module are sequentially connected through the feeding pipe, and a third-effect demister in the third-effect evaporation module is connected to a condenser and a centrifugal water vapor compressor through a three-way pipe. The centrifugal water vapor compressor is connected into a first-effect heater in the first-effect evaporation module through a pipeline; a bypass valve is connected to the pipeline between the condenser and the first-effect heater and connected with the centrifugal water vapor compressor in parallel. A top inlet of the triple-effect demister is connected with a high-pressure water inlet pipe. Secondary steam generated by triple effect is recycled instead of directly entering the condenser to be condensed, the recycled secondary steam enters the centrifugal steam compressor to pressurize the triple effect secondary steam, and the triple effect secondary steam is supplied to the first-effect heater to be used for heating materials to replace original live steam, so that the purposes of saving energy and reducing consumption are achieved.

The invention discloses an MVR (Mechanical Vapor Recompression) evaporation mode and device capable of changing operation modes. According to the MVR evaporation mode capable of changing the operation mode, an MVR evaporation device and common evaporation devices connected in series are used for forming two sections of evaporation devices, and heat source steam and steam output by a compressor in the MVR evaporation device are used for providing evaporation heat sources for the two sections of evaporation devices in parallel; control valves are respectively arranged on steam supply pipelines through which heat source steam and steam output by a compressor in the MVR evaporation device are parallel to the two sections of evaporation devices, so that independent heat supply channels for the two sections of evaporation devices are realized.

The invention belongs to the technical field of chemical fertilizer production and livestock feed, and particularly relates to a combined preparation method of water-soluble potassium sulfate and feed-grade potash magnesium sulphate fertilizer. According to the method, the picromerite concentrate wet material is taken as an initial raw material, the picromerite concentrate wet material with relatively low potassium and magnesium content is purified into high-grade potassium sulfate and the potash magnesium sulphate fertilizer by utilizing hot melt mother liquor at different mother liquor points through multi-stage hot melt and multi-stage vacuum evaporative crystallization, so that efficient distribution and conversion of potassium and magnesium elements in the raw material are realized, resource waste is avoided, and the production cost is reduced. The comprehensive utilization rate of raw materials is greatly improved. Two high-added-value products, namely the water-soluble potassium sulfate and the feed-grade potassium-magnesium fertilizer, are prepared at the same time, and the blank of combined preparation of raw materials required by agriculture and animal husbandry is filled.

The present invention relates to the technical field of phosphoric acid solution concentration, and in particular to a system for comprehensive heat utilization in a phosphoric acid concentration device, comprising: an inlet and outlet heat exchanger; a raw acid preheater; a first-stage evaporation separator; a first-stage circulation pump; a first-stage evaporator; a gas-liquid separator; a second-stage evaporator; a second-stage evaporation separator; and a second-stage circulation pump, with defined connections between the various devices. The present invention utilizes an inlet and outlet heat exchanger to eliminate the need for circulating water for cooling finished phosphoric acid, making heat utilization in the concentration process more efficient and reasonable, thereby increasing the economic efficiency of the device. In the present invention, the various devices can effectively cooperate, effectively and reasonably utilizing the heat in the concentration process, reducing steam consumption and increasing the economic efficiency of the device.

The utility model relates to a waste heat utilization device of a sodium carbonate production system in the technical field of waste heat recovery in the sodium carbonate industry. According to the cleaning device, the motor is arranged and drives the first full gear and the second full gear to rotate, then the first half gear and the second half gear are driven to rotate, the rack is driven to move, the cleaning roller is driven to horizontally move in a reciprocating mode, the heat exchange metal pipe is cleaned, scale on the surface of the heat exchange metal pipe can be removed, the surface is kept clean, and corrosion and abrasion are prevented; and the waste heat recovery efficiency is improved, and the cleaning and maintenance time and money cost are reduced. And the water storage tank is arranged, heat energy can be stored, heat output can be balanced and stabilized, it is ensured that heat cannot be wasted, and the waste heat recovery efficiency is improved. A large amount of low-temperature waste heat of a sodium carbonate production system is used for heating calcium chloride raw material liquid, finished calcium chloride is prepared through sodium filtration, evaporation and crystallization, the quality and yield of the calcium chloride product are improved, the salt content of the calcium chloride finished product is reduced, and meanwhile steam consumption in the calcium chloride production process is reduced.

The utility model provides a heat-sensitive material-containing solvent recovery device, which comprises a first reduced pressure distillation device provided with a first feed end, a first gas phase discharge end and a first liquid phase discharge end; the first feeding end is used for feeding a mixed material, and the mixed material comprises a heat-sensitive material and at least one solvent; the second reduced pressure distillation device is provided with a second feeding end, a second gas phase discharging end and a second liquid phase discharging end; the second feeding end is connected with the first liquid phase discharging end, and the vacuum degree of the second reduced pressure distillation device is larger than that of the first reduced pressure distillation device; the second liquid phase discharge end is used for extracting a heat-sensitive material; the vacuum rectification device is provided with a third feeding end, a light component discharging end and a heavy component discharging end, and the third feeding end is connected with the first gas phase discharging end; and the light component discharge end is used for extracting the solvent. According to the utility model, the solvent is continuously concentrated and separated through distillation and rectification under the condition of pressure reduction, so that the decomposition of heat-sensitive materials in the solvent recovery process is reduced.

The utility model discloses a fin type multi-effect evaporation and concentration device, which comprises a first-effect evaporation and separation device, a second-effect evaporation and separation device, a third-effect evaporation and separation device and a fourth-effect evaporation and separation device, wherein the first-effect evaporation and separation device is used for heating liquid feed to evaporation temperature to evaporate volatile substances so as to realize separation and obtain primary feed; the first-effect fin type heat exchanger is used for evaporation and compression; the second-effect evaporation and separation device is used for further evaporating and separating the vaporized liquid; a coil heat exchanger for evaporation and compression is arranged; and the matching device is used for controlling the first-effect evaporation separation device and the second-effect evaporation separation device. According to the utility model, the spiral plate type heat exchanger is arranged in the heater to collect residual steam of fresh steam in evaporation and concentration, and the heat of the residual steam is used for heating feed liquid, so that the heat exchange efficiency is improved.

The invention relates to the field of hydrogen production by water decomposition through thermochemical sulfur-iodine circulation, in particular to an HIx phase purification process and system for hydrogen production through thermochemical sulfur-iodine circulation, the process comprises a Bunsen reaction, a sulfuric acid decomposition reaction and an HI decomposition reaction, and an HIx phase obtained through the Bunsen reaction flows into an HIx phase purification tower; sulfuric acid impurities in the HIx phase are subjected to temperature reduction, pressure reduction and temperature rise in the tower to be converted into hydrogen sulfide; hydrogen sulfide gas is separated out from the solution and then enters a hydrogen sulfide combustion tower, the hydrogen sulfide gas and oxygen generated by decomposition of sulfuric acid are combusted into sulfur dioxide under the oxygen-enriched condition, and sulfur is returned to Bunsen for reaction in the form of sulfur dioxide. According to the method, a side reaction path regulation strategy is adopted, sulfuric acid impurities in the HIx phase are completely converted into sulfur dioxide, harm of sulfur dioxide to a hydroiodic acid decomposition catalyst is avoided, extra impurities are not introduced in the whole purification process, extra energy consumption input is not needed, system heat management is optimized, and the heat efficiency and the energy utilization rate of the whole system are improved.

The invention belongs to the technical field of heat pump rectification, and particularly relates to a double-effect heat pump rectification system which comprises a first-effect rectification tower feeding pump connected with a preheater, the preheater is connected with a first-effect rectification tower, the first-effect rectification tower is connected with a gas-liquid separator through a screw compressor, and the gas-liquid separator is connected with a tail gas condenser through a second-effect falling film reboiler. The second-effect falling film reboiler is connected with a first-effect reflux discharge pump through a first-effect reflux tank, and the first-effect reflux discharge pump is connected with the preheater; the first-effect rectifying tower is respectively connected with a first-effect falling film reboiler and a first-effect falling film circulating pump; the first-effect rectifying tower is connected with a second-effect rectifying tower through a first-effect tower kettle discharging pump; the first-effect falling film reboiler is connected with a second-effect reflux discharge pump through a second-effect reflux tank; the second-effect falling film reboiler is connected with a second-effect falling film circulating pump and a second-effect rectifying tower, the second-effect falling film reboiler is connected with a second-effect rectifying tower kettle discharging pump through the second-effect rectifying tower, and the second-effect rectifying tower is connected with the first-effect falling film reboiler. According to the invention, double-effect rectification and heat pump rectification are successfully combined, and the cost is low.

The utility model relates to an ammonium phosphate evaporation and concentration system and belongs to the field of chemical engineering. The system comprises a concentrated ammonium phosphate pump, a concentrated ammonium phosphate storage tank, an I-effect evaporation chamber, an I-effect heater, an I-effect circulating pump, an I-effect charging pump, an II-effect evaporation chamber, an II-effect heater, an II-effect circulating pump, an II-effect charging pump, an III-effect evaporation chamber, an III-effect heater and an III-effect circulating pump. By adopting the system and the method, low-pressure saturated live steam is utilized to indirectly heat dilute ammonium phosphate to generate secondary steam and tertiary steam to continuously heat the dilute ammonium phosphate to produce concentrated ammonium phosphate. Compared with a two-effect evaporation concentration process flow which is widely used at present, the three-effect countercurrent evaporation concentration process flow saves energy by 47%. The utility model aims at saving energy, reducing consumption, reducing carbon emission of a production device and protecting the environment.

The utility model discloses a condensation evaporator set for concentrating a sodium aluminate solution, and aims to solve the problems of higher production cost caused by more condensation water tank equipment of an evaporator set and higher steam consumption of the evaporator set caused by insufficient utilization of heat of secondary condensation water in the prior art. Comprising a steam condensation loop formed by sequentially connecting seven sets of evaporators, the steam condensation loop comprises a secondary steam condensation recovery branch, and the second-effect evaporator to the last-effect evaporator are directly and sequentially connected through a secondary condensate water collecting pipe. The secondary steam condensation recovery branch further comprises a secondary condensate water collecting tank and a secondary condensate water pump which are arranged on a secondary condensate water collecting pipe led out of the last-effect evaporator. The utility model has the advantages that a secondary condensate water tank corresponding to each effect heating chamber is omitted, the equipment investment of the secondary condensate water tank is reduced, the production cost is reduced, secondary condensate water directly enters the shell pass of the next effect heating chamber in sequence, the heat utilization is more sufficient, and the steam consumption of the evaporator group is lower.

The utility model discloses an MVR (Mechanical Vapor Recompression) evaporation system for lactic acid production, which comprises a first-effect falling film evaporator, a second-effect falling film evaporator, a third-effect falling film evaporator, a first-stage steam compressor, a second-stage steam compressor and a third-stage steam compressor which are sequentially communicated in series along a material flowing direction, secondary steam generated by the second-effect falling-film evaporator and the third-effect falling-film evaporator is heated by the first-stage steam compressor and then enters the second-stage steam compressor to be compressed into secondary compressed steam, and one part of the secondary compressed steam enters the first-effect falling-film evaporator and the second-effect falling-film evaporator to evaporate and concentrate low-concentration lactic acid; the other part of secondary compressed steam and secondary steam generated by the first-effect falling film evaporator enter a third-stage steam compressor to generate third-time compressed steam, the third-time compressed steam enters a third-effect falling film evaporator to evaporate and concentrate lactic acid, and low-concentration lactic acid is evaporated and concentrated by using high-quality compressed steam; the consumption of fresh steam is effectively reduced, the energy consumption is reduced, and the evaporation and concentration cost is reduced.

The utility model relates to the technical field of hydrometallurgy water treatment, and discloses a multi-effect horizontal tube falling film evaporator which comprises a front sealing head, a rear sealing head and at least two evaporation devices, the front sealing head, the at least two evaporation devices and the rear sealing head are sequentially connected from front to back, the front sealing head is provided with a steam inlet, and the rear sealing head is provided with a steam outlet; the front tube plate and the rear tube plate are arranged in a front-back spaced mode so as to divide the interior of the evaporation device into a steam inlet chamber, an evaporation chamber and a steam exhaust chamber from front to back, and the steam exhaust chamber of the previous evaporation device is communicated with the steam inlet chamber of the next evaporation device. A steam inlet hole and a front steam outlet hole are formed in the front pipe plate, the rear pipe seal is communicated with the steam exhaust chamber through a rear liquid discharge pipe, a rear steam outlet hole is formed in the rear pipe wall, and the evaporation chamber is communicated with the steam exhaust chamber through the rear steam outlet hole; the heat exchange pipe is arranged in the evaporation chamber in a front-back extending mode and comprises an upper pipe body and a lower pipe body. The evaporator disclosed by the utility model is more uniform in liquid distribution, higher in steam utilization rate, higher in heat transfer efficiency, better in system performance and higher in water yield.