110results about "Boiling apparatus" patented technology

The invention discloses a dry reboiler for an isotope rectifying tower device. The dry reboiler comprises a porous thin-wall structure and a heating supporting part, wherein the heating supporting part comprises a liquid collecting surface, the porous thin-wall structure is connected with the heating supporting part and located above the liquid collecting surface of the heating supporting part, and the porous thin-wall structure is configured to provide a capillary surface for liquid to flow; liquid on the liquid collecting surface is sucked into the thin wall of the porous thin-wall structure from bottom to top through capillary force, so that gas and liquid flowing in the porous thin-wall structure are subjected to heat and mass transfer; the heating supporting part is provided with a heating rod, the heating supporting part is further configured to transfer heat to the liquid collecting surface of the heating supporting part and the porous thin-wall structure through the heating rod, and the dry type reboiler can reduce the liquid holdup and has the functions of quickly responding to load change, being compact in structure and the like, so that the production requirements of high efficiency, energy conservation and stability are met.

The invention belongs to the technical field of carbon dioxide capture, and particularly relates to a CO2 pregnant solution catalytic desorption regeneration system and method based on thermosyphon self-circulation. The device comprises a desorption tower, wherein a first reboiler and a second reboiler are arranged at the bottom of the desorption tower in parallel; a CO2 rich solution inlet is formed in the upper part of the desorption tower, a CO2 gas outlet is formed in the top of the desorption tower, a CO2 barren solution outlet is formed in the bottom of the desorption tower, a reboiler interface is formed in the lower part of the desorption tower, and a bundled molecular sieve catalyst is arranged at the lower part in the desorption tower; material inlets of the first reboiler and the second reboiler are arranged below the bundled molecular sieve catalyst, and material outlets of the first reboiler and the second reboiler are arranged above the bundled molecular sieve catalyst; a CO2 gas outlet in the top of the desorption tower is connected to a CO2 gas collecting unit. The bundled molecular sieve catalyst is introduced into the lower part of the desorption tower, and the CO2-rich solution is heated by double reboilers at the bottom of the tower, so that thermosyphon is formed to realize self-circulation flow of the CO2-rich solution so as to enable the CO2-rich solution to be in full contact with the catalyst, and the problems of long desorption time, high desorption energy consumption and the like in the traditional process are solved.

The solar energy trapping system based on the absorption tower and the desorption tower comprises the absorption tower which is provided with a first inlet, a first outlet, a second inlet and a second outlet; the desorption tower is provided with a third inlet, a third outlet and a fifth outlet, the third inlet is communicated with the first outlet, the third outlet is located at the top of the desorption tower and used for discharging carbon dioxide gas, and the fifth outlet is communicated with the second inlet; the light gathering part is used for gathering sunlight, the sunlight gathered by the light gathering part faces the desorption tower and serves as a heat source of the desorption tower so that carbon dioxide gas can be discharged from rich liquid in the desorption tower, the light gathering part is arranged on at least one of the absorption tower and the solar energy installation frame, and the solar energy installation frame, the absorption tower and the desorption tower are arranged at intervals. Therefore, the solar energy trapping system based on the absorption tower and the desorption tower has the advantages of reducing energy consumption and saving energy.

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 provides a novel vertical multi-stage evaporation reboiler which comprises a reboiler shell, a plurality of liquid collecting tanks are mounted in the reboiler shell, a gas channel is arranged between one end of each liquid collecting tank and the inner side of the reboiler shell, and a heat exchange tube is mounted in each liquid collecting tank; a feed liquid distributor is correspondingly arranged at the upper part of the uppermost liquid collecting tank or a feed liquid distributor is correspondingly arranged at the upper part of each liquid collecting tank; the feed liquid distributors are connected with the bottom of the reboiler shell through feed liquid pipelines; the lower part of the reboiler shell is connected with a liquid inlet pipeline, and the upper part of the reboiler shell is connected with a gas outlet pipeline; a plurality of liquid collecting tanks are designed, so that step-by-step heating of fluid can be realized; therefore, the reboiler has higher boiling heat transfer efficiency under a lower heat transfer temperature difference, the energy utilization rate is improved, and the application range of the reboiler is expanded; in addition, when the cold fluid can flow step by step, the uniform heat transfer effect is achieved.

The invention relates to the technical field of chemical engineering, in particular to a food-grade ammonia water production system and method. The food-grade ammonia water production system comprises a liquid ammonia tank, a first heat exchanger, a first buffer device, an absorption tower and a second heat exchanger which are connected in sequence; the first heat exchanger is used for heating liquid ammonia to form ammonia gas; the second heat exchanger is used for cooling the ammonia water; an ammonia gas pipeline is arranged between the first buffer device and the absorption tower, and a pressure sensor is arranged on the ammonia gas pipeline; a second buffer device is arranged between the pressure sensor and the ammonia gas pipeline; the first buffer device internally comprises an air inlet pipe, a plurality of distribution pipes arranged in parallel and an exhaust pipe which are connected in sequence; the pipe diameter of the distribution pipe is smaller than that of the gas inlet pipe or the gas outlet pipe. The food-grade ammonia water production system provided by the invention can reduce the fluctuation amplitude of pipeline pressure caused by the process of forming ammonia gas from liquid ammonia, improves the production stability, and enables the detected pipeline pressure value to have a higher reference value.

The utility model discloses a tower bottom reboiler for a redistillation tower of an MTBE (methyl tert-butyl ether) device, which relates to the technical field of reboilers and particularly comprises a shell, a collecting tank is arranged in the middle of the bottom of the shell, a cold fluid discharge pipe is arranged at one end of the collecting tank, and a cold fluid inlet pipe is arranged at the top end of an inner cavity of the shell. Nozzles are uniformly arranged at the bottom of the inner cavity of the cold fluid inlet pipe, and a gas exhaust pipe is arranged at the top of the inner cavity of the shell; a hot fluid inlet cavity and a hot fluid outlet cavity are formed in one end of the shell, a hot fluid inlet pipe is arranged on the outer side of the hot fluid inlet cavity, and a hot fluid outlet pipe is arranged on the outer side of the hot fluid outlet cavity. According to the tower bottom reboiler for the redistillation tower of the MTBE device, a cold fluid is in contact with the heat exchange pipe in a spraying mode, the heat transfer area of the cold fluid is increased, the product gasification speed is increased, the retention time of the cold fluid in the shell is shortened, and the scaling probability of the cold fluid on the heat exchange pipe is reduced; and moreover, the heat exchange tube can be washed in a spraying manner, so that the scaling probability of the heat exchange tube is further reduced.

Provided is a method for concentrating a sodium hydroxide aqueous solution including: in a stepwise concentration process of sodium hydroxide aqueous solution, including a concentration part in which a plurality of evaporators from a first evaporator to a nth evaporator are connected in series, adding a sodium hydroxide aqueous solution to the first evaporator and then performing evaporation to obtain a first sodium hydroxide concentrate, and recovering steam evaporated from the sodium hydroxide aqueous solution; and adding the first sodium hydroxide concentrate to an evaporator at a subsequent stage, and adding the steam recovered from the first evaporator to a mechanical vapor recompression device to perform compression, wherein the nth evaporator uses the compressed steam as a heat source.

The present invention relates to a high-efficiency reboiler and distillation tower, belonging to the technical field of reboilers. The reboiler comprises a shell, a U-shaped heat exchange tube disposed within the shell, the shell being provided with a shell-side inlet and a shell-side outlet, one end of the shell being provided with a liquid inlet chamber and a liquid outlet chamber, the two ends of the U-shaped heat exchange tube being connected to the liquid inlet chamber and the liquid outlet chamber respectively, the shell being provided with a tube-side inlet and a tube-side outlet corresponding to the liquid inlet chamber and the liquid outlet chamber respectively, a cleaning plate being provided on the U-shaped heat exchange tube, the cleaning plate being provided with through holes corresponding to the U-shaped heat exchange tubes, the through holes being provided with cleaning members, and the shell being provided with a driving member for driving the cleaning plate to reciprocate along the length direction of the shell. The present invention solves the problem of the difficulty in cleaning the internal structure of the reboiler in the prior art.

A system includes a vaporizer vessel. The vaporizer vessel includes an outlet fluidly connected to the vaporizer vessel. A heater is configured to heat the vaporizer vessel. A valve is configured to regulate a pressure of a vaporized material at the outlet. In response to the pressure at the outlet being outside a set pressure range, the heater is configured to increase or decrease heat to the vaporizer vessel.

An embodiment may include a system with a pressure vessel, and a heating jacket coupled to the pressure vessel. In an embodiment, the heating jacket comprises a heating element. In an embodiment, the system may also include a steam injector with a first inlet, a second inlet, and an outlet. In an embodiment, the system may further include a first fluidic path between the pressure vessel and the first inlet of the steam injector, and a second fluidic path between the pressure vessel and the outlet of the steam injector. In an embodiment, the system may further include a nozzle assembly, where the nozzle assembly includes a nozzle configured to eject a fluid from the system, and a third fluidic path between the pressure vessel and the nozzle assembly where the third fluidic path is configured to provide the fluid to the nozzle assembly.

The utility model relates to the technical field of reboilers, and discloses a rectifying tower reboiler which comprises a reboiler body, a feeding pipe is fixedly connected to the top of the reboiler body, a discharging pipe is fixedly connected to the bottom of the reboiler body, a steam inlet pipe is fixedly connected to the side wall of the reboiler body, a heat insulation box is arranged on the side wall of the reboiler body, and a steam outlet pipe is fixedly connected to the bottom of the reboiler body. A water outlet pipe is fixedly connected to the side wall of the reboiler body, a filtering mechanism is arranged in the steam inlet pipe, a switching mechanism is arranged at one end of the water outlet pipe, the filtering mechanism comprises a filtering ring, and a sliding block is fixedly connected to the side wall of the filtering ring. According to the utility model, particulate matters in steam are blocked by the filter ring to prevent the influence on the distillation effect, the filter ring can be detached to clean impurities after the work is finished, the filter ring is locked by the clamping block to complete fixation when the filter ring is reinstalled, and the particulate matters in the steam are effectively blocked and prevented from entering the reboiler body through the matching of the structures, so that the reboiler is convenient to use. The distillation effect and the product quality are ensured.

The invention discloses a reboiler suitable for a carbon dioxide capture technology, which comprises a reboiler body, an upper tube plate and a lower tube plate are respectively arranged at the upper part and the lower part in the reboiler body, and the upper tube plate and the lower tube plate divide the reboiler body into a body upper section, a body middle section and a body lower section, the upper pipe plate and the lower pipe plate are fixedly connected with a plurality of multifunctional composite pipes penetrating through the body middle section to communicate the body upper section with the body lower section, the body lower section is provided with a concentrated liquid inlet and a corresponding connecting pipe, and the body middle section is provided with a steam inlet, a condensed water outlet and a corresponding connecting pipe. The upper section of the body is provided with a thin liquid outlet, a mixed gas outlet and a corresponding connecting pipe. The reboiler disclosed by the invention has better heat transfer characteristic, better separation effect and simpler structural characteristic, and meanwhile, the operation and maintenance period of equipment is also prolonged; the product has a very good application prospect in a process route of a carbon dioxide flue gas absorption method, and meanwhile, the product can also be applied to other similar scenes needing gas-liquid separation.

The present application relates to laboratory analysis equipment technical field, disclose a kind of steam distillation apparatus, including steam generator and multiple groups of distillation units in parallel arrangement;Steam generator is provided with control console and steam outlet, steam outlet is connected with main steam pipeline, multiple branch pipes are arranged on main steam pipeline at intervals, electromagnetic valve is arranged on each branch pipe, and electromagnetic valve is electrically connected with control console;Each group of distillation units includes sequentially connected reaction vessel, condenser and collection vessel;Reaction vessel is communicated with main steam pipeline by branch pipe, for steam is introduced into the bottom of reaction vessel;Condenser is communicated with reaction vessel, for after distillation product is condensed into liquid, it is exported to collection vessel.The multiple groups of distillation units of the present application share a steam generator, realize steam independent distribution in each distillation unit, save space and energy consumption, improve efficiency, and automation is realized, greatly reduce the security risk of operation process.

The invention discloses a vacuum azeotropic dehydration and NMP (N-Methyl Pyrrolidone) efficient recovery method of crystalline sodium sulfide in polyphenylene sulfide synthesis. According to the method, azeotropic dehydration is carried out under the vacuum condition of-0.08 MPa to-0.095 MPa, so that a water-NMP mixture can be evaporated at the temperature of 65-85 DEG C, and the dehydration temperature and energy consumption are remarkably reduced; azeotropic steam evaporated by dehydration does not need to be condensed and directly enters a rectifying tower to be separated, so that the dehydration step and the solvent recovery step are coupled. The high-purity NMP obtained by the rectifying tower is greater than or equal to 99.5% and is recycled for production. According to the method, the NMP loss is reduced, the stability of the sodium sulfide slurry is improved, and the method is suitable for continuous industrial production of PPS and has remarkable energy-saving, cost-reducing and process-optimizing effects.

The present invention provides a separation device and separation process for Fischer-Tropsch synthesis tail gas, which include a decarbonization tower, a dehydrogenation tower and a methane distillation tower connected in sequence. The separation device also includes: a first reboiler, having a first heat exchange channel and a second heat exchange channel, the first heat exchange channel being used for heat exchange with the second heat exchange channel, the first heat exchange channel being connected to the bottom of the methane distillation tower, the gas phase light component outlet of the second decarbonization tower being connected to the inlet of the second heat exchange channel to provide a heat source for the first reboiler; a first condenser, the inlet of the first condenser being connected to the top of the dehydrogenation tower; a second condenser, having a third heat exchange channel and a fourth heat exchange channel, the third heat exchange channel being used for heat exchange with the fourth heat exchange channel, the inlet of the third heat exchange channel being connected to the gas phase light component outlet of the methane distillation tower, the outlet of the first condenser being connected to the inlet of the fourth heat exchange channel to provide a cold source for the second condenser.

The utility model discloses a waste gas washing tower for industrial waste gas treatment, particularly relates to the technical field of waste gas washing, and comprises a tank body, a fixed plate, a gas transmission port, a gas collecting hood, a gas outlet pipe, a heating assembly, a filtering assembly, a cooling assembly, a collecting assembly, a fixed assembly and a circulating assembly, the waste gas washing tower for industrial waste gas treatment mainly comprises a tank body, a filler, a reboiler and a condenser. In the using process, the reboiler heats washing liquid in the evaporation plate, the washing liquid is heated into water vapor, impurities such as dust in waste gas are wrapped with the water vapor, due to the fact that the water vapor has good diffusivity and wrapping performance, it can be guaranteed that the whole space is covered, the water vapor wrapping the impurities can be purified by the filler, the impurities are fixed, and therefore the waste gas is purified. And the water vapor can be kept at a certain temperature in the tank body, so that pollutants in the waste gas and the washing liquid can be subjected to sufficient physical or chemical reaction, and the purposes of better washing and purifying are achieved.

The utility model discloses a reboiling device for a ship tail gas carbon dioxide trapping system, and belongs to the technical field of ship tail gas treatment. A reboiling device for a ship tail gas carbon dioxide capture system comprises a main box body, a control part is arranged on the main box body, two groups of mutually communicated cavities are arranged in the main box body, the reboiling device further comprises at least one group of heat pipe bundles fixedly installed on the main box body, the circuitous end of each heat pipe bundle extends to one cavity, and the other end of each heat pipe bundle extends to the other cavity. A heat pipe bundle sealing head is fixedly mounted at a pipe opening of the heat pipe bundle; by means of free combination and use of the multiple stages of heat pipe bundles, each stage of independent pipe bundle can be connected with other heat pipe bundles in parallel or in series, the same or different heating media are used and are not limited to steam, smoke, hot oil, hot water and the like, various low-temperature waste heat sources on a ship can be used for waste heat recycling, and the overall heat efficiency of the whole ship is improved.

The utility model provides an intelligent inductive control reboiler, which relates to the technical field of reboilers and comprises a reboiler body, a controller is arranged on the surface of the reboiler body, a liquid level sensor is arranged on the inner wall of the reboiler body, a temperature sensor is arranged on the inner wall of the reboiler body, and a front mounting plate and a rear mounting plate are respectively arranged in the reboiler body. Heat exchange pipes are arranged on the surfaces of the front mounting plate and the rear mounting plate, threaded grooves are formed in the surfaces of the heat exchange pipes, and the moving rings, the driving blades and the annular scrapers are adopted, so that when the reboiler body runs, internal liquid flows to impact the driving blades, and then the moving rings are driven to do circular motion along the heat exchange pipes; the movable ring moves forwards or backwards on the heat exchange pipe while doing circular motion, then the annular scraping plate is driven to scrape the surface of the heat exchange pipe, dirt on the surface of the heat exchange pipe is scraped away, the maintenance cost is greatly reduced, and the working efficiency and the operation stability of the reboiler are improved.

A vaporization system includes: a vaporization device that is configured to vaporize a liquid material and that includes an inlet port through which the liquid material is introduced and an outlet port through which vaporized gas generated by vaporizing the liquid material is discharged; at least one first fixing screw with which at least one of the inlet port or the outlet port is screwed and fixed onto a base; at least one pipe member that is configured to communicate with the fixed port and through which the vaporized gas or the liquid material flows; and at least one second fixing screw with which the at least one pipe member is screwed and fixed onto the fixed port with a seal member interposed between the at least one pipe member and the fixed port.

The present invention relates to a device (1) for evaporating a liquid medium in a filling product filling system, comprising an inclined evaporator surface (40), a media inlet (5) for applying the liquid medium that is to be evaporated onto the evaporator surface (40), and grooves (44) in the evaporator surface (40) for directing the liquid medium, the grooves (44) being formed along the evaporator surface (40) in a non-linear manner.

The utility model provides a reboiler for n-heptane production, and belongs to the technical field of n-heptane production. The reboiler for n-heptane production comprises a supporting assembly and an adjusting assembly, a limiting rod is in sliding connection with a concave plate, a sliding base and a base, one end of a spring is fixedly connected with the concave plate, the other end of the spring is fixedly connected with the limiting rod, only the limiting rod needs to be pulled to be separated from the base, a movable base makes contact with the ground through a lifting piece, and the sliding base is supported; the reboiler body can be moved through the sliding seat, on the contrary, the reboiler body can be fixed through operation, time and labor are saved during operation, the height of the reboiler body can be adjusted through the hydraulic cylinder, the height of the reboiler body can be adjusted conveniently according to specific use conditions, and the reboiler is convenient to use. The reboiler body can be moved without disassembling a plurality of locking bolts, time and labor are saved, meanwhile, the height of the reboiler body can be conveniently adjusted, the applicability is high, and therefore the practicability is improved.

The invention relates to a regeneration tower with a built-in falling film reboiler. The regeneration tower comprises a tower body, and a filler layer, a liquid collecting device, a film forming device and a diaphragm plate heat exchanger which are sequentially arranged in the tower body from top to bottom, the liquid collecting device comprises a partition plate connected to the inner wall of the tower body and a plurality of ascending barrels arranged on the partition plate, and through holes are formed in the bottoms, corresponding to the ascending barrels, of the partition plate; a liquid collecting tank is formed in an area between the rising barrels above the partition plate; the diaphragm plate heat exchanger comprises a medium pipeline and a plurality of heat exchange plates with vertically arranged plate surfaces, and the medium pipeline is used for introducing a heat exchange medium into the heat exchange plates; and the film forming device can be communicated with the liquid collecting tank and is configured to guide liquid in the liquid collecting tank to distribute a film on the plate surface of the heat exchange plate. The heat exchange efficiency can be effectively improved, the regeneration energy consumption is reduced, and the occupied area and investment are reduced.

The utility model provides a miniaturized methanol reforming hydrogen production device, and relates to the field of methanol reforming hydrogen production. The device comprises a box body, and an air outlet connector and a liquid inlet are fixedly connected to the inner side surface of one end of the box body; the other end of the box body is movably connected with a rear box door through a hinge; the upper side surface of the box body is fixedly connected with a hand strap; and the surface of one side of the box body is movably connected with a material changing door through a hinge. When the evaporation device is arranged outdoors, fire is used for providing a heat source to manufacture hydrogen, on-site hydrogen production is achieved, risks caused by hydrogen transportation and storage are avoided, indoor hydrogen production is also achieved through the heating device, and therefore higher flexibility and efficiency can be shown in different application environments; when the device is used outdoors, the evaporation device and the box body can be separated at a relatively far position, so that a heating part and a reaction part are separated, and more convenience and efficiency are provided for application of small methanol reforming hydrogen production equipment.

A system for separating alkane-water azeotropic distillation of alcohol-keto acid esters comprises a small distillation tower concentrically assembled at the bottom of a first distillation tower, a first circulation line having an upstream end connected to the bottom of the first distillation tower and a downstream end connected to a distributor located at the top of the small distillation tower, a second circulation line having an upstream end connected to the bottom of the second distillation tower and a downstream end connected to the lower sidewall of the second distillation tower, a first reflux line having an upstream end connected to the top of the first distillation tower via a condenser and a downstream end connected to the reflux port of the first distillation tower, a second reflux line having an upstream end connected to the top of the second distillation tower via a condenser and a downstream end connected to the feed port of the second distillation tower, a second discharge line being provided at the bottom of the small distillation tower for feeding the second distillation tower, and a second valve being provided. The present invention has a simple structure, low maintenance cost, can effectively reduce energy consumption in separating alkane-ketone-water azeotropes, and has high separation purity.

The utility model relates to a system for reducing blockage of a reboiler and prolonging the service cycle. The system comprises a rectifying tower and the reboiler, the bottom of the rectifying tower is connected with one end of a header pipe, the other end of the header pipe is connected with one end of a first branch pipe and one end of a second branch pipe, the other end of the first branch pipe and the other end of the second branch pipe are both connected with a liquid inlet of the reboiler, the first branch pipe and the second branch pipe are both provided with control valves, the second branch pipe is provided with a power pump, and the power pump is connected with the reboiler. The power pump is located on the rear side of the control valve. And a gas-liquid outlet of the reboiler is connected with the middle part of the rectifying tower through a liquid return pipe. According to the utility model, the branch pipe I and the branch pipe II are arranged, and the power pump is arranged on the branch pipe II to provide power, so that the liquid level in the reboiler is always kept in a full-flow state, the phenomenon that the tubes in the reboiler are heated unevenly is avoided, the liquid circulation volume is increased, the heat exchange efficiency is improved, and the service life of the reboiler is prolonged.

A method for preparing metallic magnesium and industrial silicon by decomposing serpentine with hydrochloric acid is provided. Serpentine is used as a raw material, and is processed by a two-stage countercurrent leaching process in a hydrochloric acid system. A hydrometallurgical process is adopted, including beneficiation, wet grinding, slurry storage, filtration, two-stage atmospheric pressure hydrochloric acid leaching, washing and filtration of leached silica slag, iron removal and nickel precipitation from a leachate, separation, washing and filtration of a ferric hydroxide precipitate and a nickel hydroxide precipitate, crystallization and evaporation of a magnesium chloride solution, and hydrochloric acid preparation from a flue gas generated after thermal decomposition of magnesium chloride. The present disclosure develops a process of decomposing serpentine with hydrochloric acid and producing metallic magnesium by a drying-electrolysis method, and a process of producing industrial silicon by smelting silica slag in an electric furnace.

The kettle type reboiler comprises a tower kettle, a heat exchange plate bundle composed of a plurality of heat exchange plates is detachably arranged in the tower kettle, the two ends of the heat exchange plate bundle are integrated on a first tube plate and a second tube plate respectively, the first tube plate is provided with a detachable first tube box, and the second tube plate is provided with a second tube box; wherein the first tube box is provided with a liquid inlet and a liquid outlet, and the interior of the first tube box is divided into a liquid inlet area communicated with the liquid inlet and a liquid outlet area communicated with the liquid outlet by a partition plate; the U-shaped tube heat exchanger can solve the problems that a U-shaped tube heat exchanger in a traditional tower kettle is inconvenient to disassemble and assemble and difficult to clean.

A method for concentrating an aqueous sodium hydroxide solution is provided, comprising: in a stepwise concentration process of an aqueous sodium hydroxide solution including a concentration section comprising a first evaporator to an nth evaporator connected in series, adding the aqueous sodium hydroxide solution to the first evaporator, then evaporating it to obtain a first sodium hydroxide concentrate, and recovering the vapor evaporated from the aqueous sodium hydroxide solution; and adding the first sodium hydroxide concentrate to a subsequent evaporator, and adding the vapor recovered from the first evaporator to a mechanical vapor recompression device for compression, wherein the nth evaporator uses the compressed vapor as a heat source.

The utility model provides a high-efficiency flow-optimized reboiler, which relates to the technical field of chemical equipment and comprises a reboiling tower, an air outlet is arranged at the top of the reboiling tower, a liquid injection port is arranged at the top of one side of the reboiling tower, a conical separation cover is mounted at the top in the reboiling tower, isolation sieve pores are annularly arrayed at the top of the separation cover, and the separation sieve pores are communicated with the liquid injection port. According to the high-efficiency reboiler, the hole diameter of the isolation sieve hole in the center of the top of the separation cover is the smallest, the hole diameter of the isolation sieve hole in the outermost part is the largest, a heat exchange pipe is installed at the bottom, close to the separation cover, in the reboiling tower, the high-efficiency reboiler abandons a traditional single feeding mode, and fluid to be vaporized can be rapidly and evenly distributed in the tower after being injected from a liquid injection opening. Through the unique internal structural design, the occurrence of short-circuit flow and dead zones during liquid flowing is effectively avoided, and the heat and mass transfer efficiency is greatly improved.