465results about "Evaporation with vapour compression" patented technology

To provide a steam distillation system for producing clean water by purifying water.SOLUTION: A fluid steam distillation system is provided, the system comprises: a control system for controlling the fluid steam distillation device, the control system comprising, a release valve, a raw material flow controller for controlling a raw material flow rate valve, and a discharge level sensor connected to the release controller and the raw material flow rate controller. The discharge level sensor transmits a signal related to a discharge level to the discharge controller and the raw material flow rate controller which indicates the discharge level, the raw material flow rate controller drives the raw material flow rate valve on the basis of at least the discharge level sensor signal. The discharge controller drives the discharge valve on the basis of at least the discharge level sensor signal, and the discharge level and the raw material flow rate level are held by using the discharge level sensor signal as input.SELECTED DRAWING: Figure 75

An aqueous stream cleaning system including a circulation pump to receive a waste fluid and / or a concentrated liquid bottoms stream, and expel a circulation stream. The aqueous stream cleaning system can also include a primary heat exchanger to receive the circulation stream from the circulation pump. The primary heat exchanger can have a plurality of heat exchange plates that define an internal surface area for heat transfer from a distillate stream to the circulation stream to produce a cooled distillate stream and a heated circulation stream. The plurality of heat exchange plates can be spaced to facilitate free flow of solids in the circulation stream between the plurality of heat exchange plates. A mass flow rate and pressure of the circulation stream can be configured to minimize build-up of solids in the primary heat exchanger. The aqueous stream cleaning system can further include an evaporation unit to receive the heated circulation stream from the primary heat exchanger. The distillate stream is formed when steam in the heated circulation stream evaporates in the evaporation unit, and the concentrated liquid bottoms stream is formed from a portion of the heated circulation stream that does not evaporate.

The present invention relates to the extraction of lithium from liquid resources such as natural and synthetic brines, leachate solutions from clays and minerals, and recycled products.

A method for starting up vapor-recompression units comprises: providing a vapor recompression sub-system comprising one or more vapor-recompression units, wherein the vapor recompression sub-system has a vapor inlet and a compressed-vapor outlet; providing a means of reducing vapor density through pressure reduction in vapor communication with the vapor recompression sub-system; reducing pressure within the vapor recompression sub-system to reach a sub-system pressure selected from 0.1 kPa to 1000 kPa; introducing a vapor mass flow to the vapor recompression sub-system at a restricted vapor mass flow rate; starting up the vapor recompression sub-system while maintaining the restricted vapor mass flow rate for a start-up time period; and then, following the start-up time period, introducing additional vapor mass flow to the vapor recompression sub-system to reach a full vapor mass flow rate. The restricted vapor mass flow rate is from 0.1% to 90% of the full vapor mass flow rate.

The invention discloses a process for producing polyaluminum chloride by recycling aluminum ash. The process comprises a primary aluminum ash pretreatment process, a secondary aluminum ash deamination process, an ammonium chloride crystallization process, a liquid polyaluminum chloride process and a solid polyaluminum chloride process, the primary aluminum ash pretreatment procedure comprises a first cyclone separator, a ball mill, a screening machine and a bag-type dust collector, the input end of the first cyclone separator is connected with a primary aluminum ash bin through conveying equipment, the coarse ash end of the first cyclone separator is connected with a feeding port of the ball mill, and a discharging port of the ball mill is connected with a feeding port of the screening machine; fine powder screened by the screening machine and secondary aluminum ash fine powder discharged by the first cyclone separator are collected into a secondary aluminum ash bin, and dust outlets of the first cyclone separator, the ball mill and the screening machine are connected with a dust inlet of the bag-type dust collector through pipelines. By arranging a series of structures, the produced polyaluminum chloride is high in purity, the economic benefit of the process is improved, tail gas is washed, and the pollution is reduced.

The invention relates to the technical field of evaporators, and discloses a device and method for reducing the use amount of a cleaning solution for soaking a tube nest of an MVR evaporator, and the method comprises the following steps: step 1, discharging materials in the MVR evaporator; 2, opening an electromagnetic pulse valve, discharging steam in the gas-liquid separator into the tube nest through a flushing pipe, and flushing the medicine scale on the inner wall of the tube nest by the steam; and step 3, controlling the electromagnetic pulse valve to enable the steam pulse to wash the tube nest. The steam is used for preliminarily cleaning the medicine scale in the tube nest, so that the subsequent washing and cleaning time and the cleaning liquid consumption can be reduced, and the steam temperature is higher than the drinking water temperature; the steam is gas, so that pressure impact can be formed in the process of washing the tube nest; and a pulse mode is further adopted, so that the flushing effect is improved, and the energy consumption is reduced.

The embodiment of the invention provides an evaporation system control method and an evaporation system, and relates to the technical field of control, the method is applied to a control system in an MVR evaporation system.The method comprises the steps that in response to a starting instruction, a feeding system is controlled to pump to-be-treated liquid into an evaporation crystallization system, and the real-time boiling point rise of the evaporation crystallization system is monitored; and determining to adopt an optimal recovery rate control mode or a boiling point rise control mode as a target control mode based on the real-time boiling point rise, and controlling the feeding system, the evaporative crystallization system and the water production system to treat the to-be-treated liquid according to a preset strategy corresponding to the target control mode, the frequency of the distilled water and the flow of the to-be-treated liquid pumped by the feeding system meet the corresponding recovery rate, so that the control intelligence and reliability of the MVR evaporation system are improved.

Systems and methods for treating a raw wastewater feed stream using a low energy ejector, which works as a heat pump to increase the pressure and temperature of a two-phase distillate stream used, in part, to heat the raw wastewater feed stream. The systems and methods utilize heat from a liquid distillate stream and a concentrated liquid wastewater stream to pre-heat the raw wastewater feed stream and produce a liquid distillate product stream.

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 a vibration plate type anti-scaling MVR evaporator, and relates to the technical field of MVR evaporators. Comprising a compressor, a heater, a separator, a circulating pump and a heat exchanger which are connected with one another, the side end face of the heat exchanger fixedly communicates with a cold side inlet pipe and a hot side inlet pipe, the cold side inlet pipe is located on one side of the hot side inlet pipe, and an L-shaped fixed plate is fixedly installed on the side end face of the heat exchanger and located on the outer side of the cold side inlet pipe; an intercepting assembly is arranged on the L-shaped fixed plate; a mounting fixed plate and a stabilizing transverse plate are fixedly mounted on the heat exchanger, an auxiliary assembly is arranged on the mounting fixed plate and the stabilizing transverse plate, and a vibration transmission plate is arranged on the auxiliary assembly. Through cooperative use of the interception assembly and the auxiliary assembly, the anti-scaling capacity of the MVR evaporator is effectively improved, the heat exchange efficiency is improved, the service life of equipment is prolonged, energy consumption is reduced, and the use effect of the MVR evaporator is greatly improved.

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 discloses a method for separating lithium and boron in a solution with a high boron-lithium ratio. The separation method comprises the following steps: carrying out primary homogeneous electrodialysis concentration separation on a solution with a high boron-lithium ratio under an alkaline condition to prepare primary lithium-rich concentrated water; diluting the first-stage lithium-rich concentrated water to prepare first-stage diluted lithium-rich concentrated water; performing high-pressure RO concentration on the primary diluted lithium-rich concentrated water under an acidic condition to prepare lithium-rich RO concentrated water; performing first-stage homogeneous phase electrodialysis concentration separation on the lithium-rich RO concentrated water under an acidic condition to prepare first-stage lithium-rich concentrated water; carrying out adsorption boron removal and desorption treatment on the first-stage lithium-rich concentrated water by adopting boron removal adsorption resin under an alkaline condition to prepare mixed lithium-rich concentrated water and boron-containing desorption liquid; carrying out MVR (mechanical vapor recompression) evaporation on the mixed lithium-rich concentrated water for preparing battery-grade lithium carbonate; and mixing the secondary boron-rich fresh water with the boron-containing desorption solution, and carrying out MVR evaporation to obtain a boric acid product. According to the method, a reasonable boron removal process combination is adopted, and boron in the solution with the high boron-lithium ratio is removed.

The invention relates to a vacuum evaporation unit (10) comprising:-a vacuum chamber (11) for containing a liquid solution (SL) to be treated, which in turn comprises a lower part (12) for collecting the liquid solution and an upper part (13) for generating rising vapours (V) from said liquid solution; a condensation chamber (14) in which condensation of the vapour (V) resulting from boiling of the liquid solution (SL) takes place; -heat exchange means (15) configured to generate a heat exchange between the vapour (V) of the liquid solution (SL) and the liquid solution (SL) itself; -first conveying means (16) configured to guide said vapour (V) from said upper portion (13) of said vacuum chamber (11) to said heat exchange means (15). The unit comprises a scrubbing tower (20) configured for countercurrent treatment of the vapour (V) exiting the vacuum chamber (11) with a liquid absorption solution (SA).

The utility model relates to the technical field of cleaning equipment, in particular to an MVR evaporator which is provided with an evaporator body, the evaporator body is provided with a stock solution inlet pipe, a condensate water outlet pipe and a water vapor compression system, the stock solution inlet pipe is provided with a heat exchanger, the condensate water outlet pipe is provided with a condensate water tank, and the condensate water tank is provided with a heating jacket. The heat exchanger is used for recovering the heat of the condensed water in the condensed liquid outlet pipe and preheating the stock solution, so that the effective utilization of energy sources and the improvement of the evaporation efficiency are realized; through recycling of the water vapor compression system, the MVR evaporator remarkably reduces the requirement for external steam, and therefore energy is saved; by arranging the condensate water tank and the heating jacket of the condensate water tank, a necessary initial steam environment is provided for the evaporator in the starting stage, the starting process of the evaporator is accelerated, and the overall operation efficiency is improved.

The utility model discloses a wastewater pretreatment device for an MVR (Mechanical Vapor Recompression) evaporator. The wastewater pretreatment device comprises a hardness removal reaction unit, a wastewater collection unit, a dosing unit and a treating fluid transfer unit, the hardness removal reaction unit comprises a reaction tank and a sediment solid discharge port formed in the bottom of the reaction tank; the wastewater collecting unit comprises a wastewater collecting barrel and a first lifting pump which is arranged on the wastewater collecting barrel and is used for sucking wastewater into the reaction tank; the dosing unit comprises a liquid medicine barrel and a dosing pump used for sucking liquid medicine in the liquid medicine barrel into the reaction tank, and the main chemical component of the liquid medicine is one of Na2CO3, NaHCO3 or H2CO3; the treatment liquid transfer unit comprises a treatment liquid transfer barrel and a second lifting pump for sucking the wastewater without hardness in the reaction tank into the treatment liquid transfer barrel. According to the device disclosed by the utility model, calcium and magnesium ions in the wastewater are separated out in a crystal form by adding the carbonic acid soluble salt; and part of crystalline salt remaining in the waste liquid is filtered and removed by the filter for the second time, so that a series of problems caused by scaling of the evaporator are solved.

The invention discloses integrated MVR (Mechanical Vapor Recompression) evaporative crystallization equipment, and relates to the technical field of evaporative crystallization. Comprising a frame body which is fixedly connected with an evaporation shell, a separator and a crystallizer; the first plate is rotationally connected into the evaporation shell; the first plate is arranged in the evaporation shell, the second plate is arranged in the evaporation shell, heat exchange pipes which are arranged at intervals are fixedly connected between the first plate and the second plate, and the heat exchange pipes are spiral and are used for bearing the gravity of a liquid medium, so that the first plate and the evaporation shell rotate relatively. Torque is applied to the heat exchange pipe through the gravity of a liquid medium, so that the heat exchange pipe rotates, steam in the evaporation shell is disturbed, and the temperature of all positions in the evaporation shell is uniform; therefore, the evaporation degree of the liquid medium in each heat exchange tube tends to be the same (the scaling phenomenon caused by excessive evaporation of the liquid medium in each heat exchange tube is prevented), and the uniformity of crystal precipitation during subsequent crystallization is facilitated.

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 invention provides an MVR (Mechanical Vapor Recompression) evaporative crystallization system and an evaporative crystallization method for coarsely preparing lithium sulfate monohydrate. The lithium sulfate MVR evaporative crystallization system is composed of a feeding pump, a first condensate water preheater, a non-condensable gas preheater, a lithium sulfate crystallizer, a vacuum pump, a first gas-liquid separator, a steam washing tower gas-liquid separator, a condensate water pump, a condensate water tank, a mother liquor discharge pump, a discharging pump, a mother liquor pump, a mother liquor tank, a thickener, a lithium sulfate centrifugal machine, a drying machine, a packaging machine, a steam compressor and a gas washing tower. And a scrubber tower circulating pump. According to the lithium sulfate MVR evaporative crystallization system and the lithium sulfate MVR evaporative crystallization method provided by the invention, the problems of system equipment scaling and evaporation gas-liquid entrainment can be reduced, and meanwhile, the crystal granularity is large and uniform.

The invention relates to the technical field of evaporation systems, in particular to a skid-mounted evaporation system and an operation method.The skid-mounted evaporation system comprises a feed preheating unit which comprises a cooling water tank and a preheater, the cooling water tank is connected with a feed pipeline and provided with a heat exchange coil, and the preheater is connected with the cooling water tank; the preheater comprises a discharge waste heat preheater and a condensate water waste heat preheater; the evaporation separation unit comprises an evaporation separator connected with the discharge waste heat preheater and the condensate water waste heat preheater at the same time, a water vapor compressor connected with the evaporation separator, and a condensate water tank connected with the water vapor compressor; wherein the condensate water tank is connected with the condensate water waste heat preheater through the condensate water pump; and the cooling unit comprises a pipeline arranged between the cooling water tank and the water vapor compressor, and a cooling water pump arranged on the pipeline.

The invention relates to the field of desulfurized gypsum, and provides a process and a system for recycling desulfurized gypsum in a coal-fired power plant. The process comprises the following steps: 1) adding water into desulfurized gypsum to prepare slurry, reacting with ammonium bicarbonate to obtain a solid-liquid mixture containing calcium carbonate and ammonium sulfate, and separating into a liquid phase and a solid phase; 2) carrying out three-stage countercurrent washing on the solid phase to obtain calcium carbonate, directly adding water into the calcium carbonate to prepare slurry without drying, and recycling the slurry for gypsum process desulfurization; the washed water is reused in the slurry in the step 1); 3) adjusting the pH value of the liquid phase to 4.5-5.5, performing evaporative crystallization to obtain pure ammonium sulfate crystals and ammonium sulfate mother liquor, and returning the ammonium sulfate mother liquor to the liquid phase in the step 1); steam condensate water generated in the evaporation process is used for three-stage countercurrent washing, and steam generated in the evaporation process is used for drying pure ammonium sulfate crystals. The invention further provides a corresponding system. The whole process / system realizes continuous production operation of resource utilization of the desulfurized gypsum, and is simple to operate and good in production stability.

The utility model relates to the technical field of lithium carbonate positive electrode material processing, in particular to an MVR (mechanical vapor recompression) evaporator for lithium carbonate positive electrode material processing. The MVR evaporator for processing the lithium carbonate positive electrode material comprises a heat insulation barrel, a discharging pipe, an electromagnetic valve I, an evaporation chamber and a connecting pipe I. The bottom in the heat insulation barrel is connected with the discharging pipe extending outwards, the electromagnetic valve I is installed at the upper end of the discharging pipe, the evaporation chamber is fixedly connected to the lower portion in the heat insulation barrel, and the right side of the upper portion of the evaporation chamber is connected with the connecting pipe I. By arranging the purification mechanism, steam is discharged into a spraying bin, a water pump operates to pump an oxidizing agent in a liquid storage box into a connecting pipe III, then the oxidizing agent is conveyed into a double-end pipe and sprayed into the spraying bin from two spraying heads to spray steam, steam purification is achieved, harmful substances of gas in the steam are removed, and the evaporator has the purification function; the problem that waste heat gas cannot be used immediately due to the fact that the waste heat gas needs to be treated additionally is effectively solved.

The present invention relates to a gravitational vapor compressor (GVC) device comprising at least one vertical compression chamber (16) and a plurality of droplet spray generating nozzles (10) are arranged at the top thereof, which nozzles form a flow of droplets in the water vapor flow along a height h1 of the vertical shell (16). The speed of the droplets from the droplet beams (10) is adjusted along the height h1 to the terminal fall velocity in relation to a gas flow, the compression chamber (16) has a height h2 from which droplets fall at the same or similar terminal velocity inside a water vapor flow, which compresses the water vapor. The gravitational vapor compressor device further comprises a secondary vapor outlet duct (13).

Described herein is an energy system (1) arranged to generate and use thermal energy, the energy system (1) comprising a mechanical vapor recompression (MVR) unit (3). The thermal energy of the working fluid is obtained during the MVR process performed by the MVR unit (3) and utilized outside the energy system, preferably for heating the process, space or object. The MVR unit comprises a main heat exchanger (5), a compressor (9), a main steam line (11) and a condenser (13). The MVR unit (3) preferably further comprises at least one liquid line (15) arranged to be connected to the condenser (13) and the main heat exchanger (5) for transferring condensed working liquid back to the main heat exchanger (5) for re-evaporation in the main heat exchanger (5). In one embodiment, the energy system (1) comprises at least one secondary heat exchanger (17) arranged for heat exchange between condensed working fluid flowing in the at least one liquid line (15) and external working fluid flowing in the at least one external fluid line (19) to use thermal energy generated by the MVR unit (3).

The application discloses an amino acid hydrolysate acid removal process using indirect MVR evaporation, and particularly relates to the technical field of amino acid hydrolysate acid removal processes, and comprises the following steps: S1, amino acid hydrolysate conveying, S2, hydrolysate evaporation under reduced pressure, S3, acid substance gas-liquid separation, S4, secondary steam conveying, and S5, liquid storage. The acid substance in the amino acid hydrolysate is evaporated and acid removal treated by adopting the MVR evaporation technology, so that the hydrolysate can form concentrated liquid and acid substance after being separated under reduced pressure, the generated acid substance is separated by a gas-liquid separator, and acid liquid and secondary steam are generated, the secondary steam can provide a secondary steam source for an evaporator after being compressed by a compressor, thereby providing a large amount of steam source for the evaporator, reducing the emission of acid gas, improving the resource utilization rate, achieving the protection of the environment, and avoiding the harm of acid gas to the human body.

The invention relates to a system and device for desalination by liquid water jet compression, which is a phase-change desalination with a high-efficiency latent heat exchanger in which the pressure of the primary saturated vapor is increased until obtaining the secondary saturated vapor by injecting translational and rotational kinetic energy via pressurized water jets, so as to leave an unobstructed path through which the vapor flows at high speed in order to achieve a high flow rate and high efficiency.

The invention provides a mechanical vapor recompression-based dehumidizer regeneration type air water taking system, which comprises a moisture absorption unit, which comprises a gas-liquid contact reaction device, and is used for enabling a dehumidizer solution to be in full contact with air for mass transfer and heat transfer, and enabling the dehumidizer solution to absorb moisture in the air so as to be diluted; the mechanical vapor recompression evaporator comprises an evaporator and a compressor, the evaporator comprises a dilute solution inlet, a concentrated solution outlet, a vapor outlet, a vapor inlet and a condensed water outlet, the evaporator comprises a dehumidizer channel capable of containing a dehumidizer solution, and the dilute solution inlet and the concentrated solution outlet are connected to the moisture absorption unit; the dilute solution inlet is used for receiving the diluted desiccant solution, the concentrated solution outlet is used for leading the evaporated and concentrated desiccant solution to the moisture absorption unit, the compressor comprises a compressor inlet and a compressor outlet, the compressor inlet is connected to the steam outlet, and the compressor outlet is connected to the steam inlet.

The invention relates to the technical field of food processing, in particular to a beverage concentrated solution extraction device and an extraction method. An air inlet of a compressor is communicated with a secondary steam outlet of a separator, and the compressor is used for sucking and compressing secondary steam; an air outlet of the compressor communicates with an inlet of the shell-and-tube heat exchanger shell layer, and the compressor is used for feeding compressed and heated steam into the shell-and-tube heat exchanger shell layer as a heating medium; a vapor-liquid mixture outlet of the shell-and-tube heat exchanger is communicated with an inlet of the separator, and a concentrated solution outlet of the separator is communicated with the storage tank through a pipeline; a condensate water outlet of the shell-and-tube heat exchanger is communicated with a condensate water tank through a pipeline via a flow meter; a suction port of the water ring vacuum pump is communicated with a non-condensable gas exhaust port of the shell-and-tube heat exchanger tube layer through the steam water ring vacuum pump; a suction port of the steam water ring vacuum pump is communicated with the condensate water tank and the storage tank and used for forming negative pressure in the condensate water tank and the storage tank. According to the technical scheme, boiler steam and a large amount of cooling water are not used, environment protection and energy conservation are achieved, and operation is convenient; the problems of high investment cost, large occupied area, complex operation and maintenance and the like of large industrial equipment in the prior art are solved.

A distillation device may comprise a source fluid input and an evaporator in fluid communication therewith. The device may further comprise a compressor having an impeller coupled to a motor, the compressor having a low pressure inlet for vapor from the evaporator and a high pressure outlet for compressed vapor. The device may further comprise at least one temperature sensor configured to monitor temperature of vapor in the inlet and a condenser in heat transfer relationship with exterior surfaces of the evaporator and in fluid communication with the compressor outlet. The device may further comprise a controller configured to govern rotation speed of the impeller with an impeller motor command based on a calibrated motor speed for the distillation device. The controller may be configured to determine an adjusted motor speed for a next use of the device and overwrite the calibrated motor speed with the adjusted motor speed.

The invention relates to a compressed air distribution device and a tail end wastewater bypass flue evaporation system. The compressed air distribution device comprises a spray gun group, a control valve group and an air path distributor, one end of the air path distributor is connected with compressed air input equipment, a flow guide plate and a pressure balance cavity are arranged in the air path distributor, the flow guide plate is used for conducting angle optimization on input compressed air, and the pressure balance cavity is used for distributing the compressed air optimized by the flow guide plate into all the cavities in a balanced mode. The hoses are connected with the spray guns in the spray gun group in a one-to-one correspondence manner; one end of the waterway distributor is connected with a desulfurization wastewater pipeline and is connected with the corresponding spray gun through a pipeline; and the control valve group is distributed in a hose connected with the gas path distributor and a pipeline connected with the water path distributor. Compared with the prior art, the system has the advantages that the stability is improved, the energy consumption is reduced, and equipment protection and automatic control are realized.

The utility model discloses a two-stage falling film MVR (Mechanical Vapor Recompression) evaporation device, which comprises a falling film heater comprising a first accommodating cavity comprising a heating area and a liquid storage area, the heating area is positioned in the middle of the first accommodating cavity, and the liquid storage area is positioned at the bottom of the first accommodating cavity; the heat exchanger is arranged in the heating area; the partition piece is arranged in the liquid storage area, one end of the partition piece and the heat exchanger are arranged at intervals, the other end of the partition piece is connected with the bottom of the liquid storage area so that the liquid storage area can be divided into a first liquid storage cavity and a second liquid storage cavity, the lower end of the first liquid storage cavity is used for communicating with an external first material inlet, and the lower end of the second liquid storage cavity is used for communicating with an external discharging pump; two ends of the first circulating pump are respectively communicated with the first liquid storage cavity and the heat exchanger; the two ends of the second circulating pump communicate with the second liquid storage cavity and the heat exchanger correspondingly. According to the utility model, the heat exchange area of the falling-film evaporator can be effectively reduced while the consumption of live steam is saved, and the purposes of reducing the volume of the falling-film heater and reducing the occupied area are achieved while the operation cost is reduced.