56 results about "Multi-stage flash distillation" patented technology

The invention relates to a compact ship tail gas carbon dioxide capture system and method, and the compact ship tail gas carbon dioxide capture system comprises a flue gas pretreatment unit, a hollow fiber membrane reactor absorption unit, a flue gas heat exchange unit, a multi-stage flash evaporation desorption unit, a CO2 compression liquefaction unit and a CO2 storage lightering unit. The compact ship tail gas carbon dioxide capture system has the advantages that the occupied area of the system is reduced, the operation cost of the system is reduced, and efficient capture of ship tail gas CO2 is achieved.

The invention belongs to the technical field of entrained-flow bed coal gasification processes, and particularly relates to an entrained-flow bed coal gasification grey water quality optimization method which comprises the following steps: (1) performing multi-stage flash evaporation on black water to be treated to obtain multi-stage concentrated black water; (2) adding a flocculating agent into the multi-stage concentrated black water to settle, and enabling the obtained supernatant liquid as overflow grey water to enter a filtration-adsorption system; (3) preparing a filter aid mixed solution in advance; before the filter is put into use, the filter aid mixed solution is introduced into the filter for precoating, and after precoating and filtering, the filter aid forms a filter aid filtering base layer on filter cloth of the filter; after the pre-coating process of the filter aid is finished, the overflow grey water is introduced into a filter for filtration-adsorption treatment; and (4) adding a dispersing agent into the obtained ash water filtrate to prepare recycled ash water, and feeding the recycled ash water into a washing tower and a gasification furnace for cyclic utilization. The method can effectively improve the water quality of the recycled grey water under the condition of reducing the dosage of the flocculating agent and the dispersing agent, and prolongs the operation period of a water system.

The utility model relates to a multistage flash evaporation and vacuum low-temperature negative-pressure black liquor concentration system based on industrial waste heat, which belongs to the technical field of flash evaporation and comprises at least one heat exchange unit and at least two flash evaporation units sequentially connected in series. The concentration medium outlet of the flash evaporation unit located at the last effect is communicated with the concentration medium inlet of the heat exchange unit equivalent to the flash evaporation unit of the last effect located at the last effect, and when the number of the heat exchange units is at least two, the heat exchange units are sequentially connected in series. The flash evaporation unit located at the first effect communicates with the heat exchange unit equivalent to the flash evaporation unit located at the first effect through a heating unit. The concentration medium generated by the last-effect flash evaporation unit flows back to the previous-effect heat exchange unit to serve as a heat source, energy recycling is achieved, the requirement for external heat input is reduced, and therefore the energy efficiency of the whole system is improved; the plurality of heat exchange units which are sequentially connected in series can more effectively utilize temperature gradient to transfer heat, so that the heat can be more uniformly transferred to each flash evaporation unit, and the heat transfer effect is enhanced.

The invention discloses a low-temperature seawater desalination method and device.The seawater desalination method specifically comprises the following steps that S100, raw seawater is introduced into pretreatment equipment and sequentially subjected to grating filtration, ultrafiltration membrane filtration and ion exchange resin adsorption, and pretreated seawater is obtained; s200, feeding the pretreated seawater into seawater heating equipment for heating, and heating the seawater to 50-60 DEG C; s300, the heated seawater is sequentially fed into each stage of flash evaporation chamber of the multi-stage flash evaporation equipment, and in each stage of flash evaporation chamber, the seawater is subjected to flash evaporation due to pressure reduction, and steam is generated; s400, the concentrated seawater subjected to multi-stage flash evaporation is introduced into membrane distillation equipment, a hydrophobic microporous membrane is adopted as a membrane distillation assembly, and water molecules in the concentrated seawater penetrate through membrane holes to form steam under the action of the temperature difference between the two sides of the membrane; and S500, introducing the water vapor generated in the steps S300 and S400 into seawater heating equipment for heat exchange, and heating the seawater while generating condensed fresh water.

The invention discloses a device and a process for recovering yellow phosphorus in phosphorus sludge based on multistage flash evaporation continuous evaporation. The device comprises a pretreatment system, a drying-pyrolysis-evaporation integrated system and a product recovery and treatment system, phosphorus slurry is pretreated in the pretreatment system in a steam crushing and mixing mode and then enters the drying-pyrolysis-evaporation integrated system for precise temperature control through gradient electromagnetic heating, and the product recovery and treatment system is used for recycling the phosphorus slurry. And finally, the yellow phosphorus enters a product recovery and treatment system, so that the yellow phosphorus and phosphorus-free residues are recovered. According to the device and the process, phosphorus slurry can be uniformly fed in the whole process, phosphorus is evaporated thoroughly, and the yellow phosphorus recovery rate reaches 95% or above; the equipment sealing performance is good, and the risk of ignition caused by spontaneous combustion of yellow phosphorus is effectively avoided; the phosphorus sludge processing capacity reaches 0.5-1.0 ton per hour, continuous and stable operation can be performed for more than 720 hours, and the recycled residues are uniform in granularity and can be used for production of phosphate fertilizers, cement and the like, so that resource recycling is realized.

The invention discloses a novel boiler continuous drainage self-heating desalting system which comprises a heating evaporation and water supply system, a saline water discharging and cooling circulation system, a finished product water discharging system, a cold air system and a vacuum system. The heating evaporation and water supply system comprises a continuous blowdown flash tank, a flash tank, an evaporator and an air-cooled condenser which are connected in sequence, the evaporator is a multi-effect evaporator, the steam output end of the flash tank is connected with the steam input end of a first-effect evaporator of the evaporator, and the water drainage end of the flash tank is connected with a water spraying device of the first-effect evaporator of the evaporator; and the constant-drainage flash tank is connected with a water spraying device of a second-effect evaporator of the evaporator through a constant-drainage hot water pipeline. According to the scheme, a low-temperature multi-effect process mode and a multi-stage flash evaporation process mode are combined, heat of regular discharge and continuous discharge of the power plant is recycled, regular discharge and continuous discharge waste water is utilized for multiple times according to corresponding attributes in a grading mode, heat source loss is reduced, and the energy utilization rate is increased.

The utility model relates to a circulating self-heating type multi-stage flash evaporation system, which belongs to the technical field of flash evaporation and comprises at least one heat exchange unit and at least two flash evaporation units sequentially connected in series. The concentration medium outlet of the flash evaporation unit located at the last effect is communicated with the concentration medium inlet of the heat exchange unit equivalent to the flash evaporation unit of the last effect located at the last effect, and when the number of the heat exchange units is at least two, the heat exchange units are sequentially connected in series. The flash evaporation unit located at the first effect communicates with the heat exchange unit equivalent to the flash evaporation unit located at the first effect through a heating unit. The concentration medium generated by the last-effect flash evaporation unit flows back to the previous-effect heat exchange unit to serve as a heat source, energy recycling is achieved, the requirement for external heat input is reduced, and therefore the energy efficiency of the whole system is improved; the plurality of heat exchange units which are sequentially connected in series can more effectively utilize temperature gradient to transfer heat, so that the heat can be more uniformly transferred to each flash evaporation unit, and the heat transfer effect is enhanced.

The present application relates to the technical field, especially to a kind of seawater desalination system and seawater desalination method, which combines forced circulation evaporator with multi-stage flash evaporation, and the forced circulation evaporator realizes water and salt resource utilization for flash evaporation concentrated brine;At the same time, low-grade heat or solar energy is used as the steam separation power in the forced circulation evaporator, and solar light modulation technology is used to improve the utilization rate of solar energy, which can greatly reduce the power consumption compared with mechanical forced circulation, reduce the overall energy consumption, solve the environmental pollution caused by direct discharge of flash evaporation concentrated brine, and achieve zero discharge of waste water and waste gas.

The present application relates to a kind of large particle size sodium nitrate multistage flash cooling crystallization production systems, it includes feed unit, evaporation unit, seed unit, flash crystallization unit, condensation unit, thickening unit, centrifugal drying unit and mother liquor reflux unit, seed unit includes material pump and seed tank, the discharge port of separator is connected to seed tank by material pump;Flash crystallization unit includes first flash crystallization ware, first material pump, second flash crystallization ware, second material pump, third flash crystallization ware and third material pump, the discharge port of seed tank is connected to the feed port of first flash crystallization ware, first flash crystallization ware, second flash crystallization ware, third flash crystallization ware are sequentially connected.The sodium nitrate solution of the present application is distributed uniformly by multistage flash, crystal growth time, and crystal size is adjusted by controlling fine crystal elimination amount, crystal size is large, particle size distribution is uniform, crystal size D90≥0.9mm, variation coefficient CV≤25.

This invention discloses a highly stable carbon dioxide capture system and method based on a multi-stage flash evaporation process, relating to the field of gas separation and emission reduction technology. The system includes a carbon dioxide absorption tower, an intermediate buffer tower, a low-pressure flash evaporation tower, a carbon dioxide desorption tower, a flash tank, a compressor, and a vortex tube, all connected sequentially by pipelines. After CO2 is captured in the absorption tower, the rich liquid enters the intermediate buffer tower. The top gas phase undergoes low-pressure flash evaporation to obtain high-purity CO2 product, while the bottom semi-lean liquid is partially recirculated for absorption and partially regenerated through desorption. The regenerated hot lean liquid undergoes secondary flash evaporation in the flash tank, and its gas phase is compressed and energy-separated by the vortex tube. The hot and cold streams are reused for absorption cooling and desorption heating, respectively. This invention achieves efficient CO2 capture, absorbent stability, and significant energy savings through a unique multi-stage flash evaporation-regeneration process and a flash-compression composite vortex tube high-efficiency energy mode.

The utility model discloses a coal gasification black water treatment system capable of recycling waste heat for power generation. The coal gasification black water treatment system comprises a multi-stage flash evaporation unit, a multi-stage waste heat power generation unit, a black water clarifying and fine slag filtering unit and a grey water degassing unit, the multi-stage flash evaporation unit comprises a three-stage flash evaporator, the multi-stage waste heat power generation unit comprises a multi-stage generator set and a multi-stage medium heater, the black water clarifying and fine slag filtering unit comprises a concentration cyclone, the bottom of the concentration cyclone is connected with a filter, an upper outlet of the concentration cyclone is connected with an ash water tank, and the ash water degassing unit comprises a gas remover connected with the medium heater. According to the coal gasification black water treatment system disclosed by the utility model, by arranging the multi-stage flash evaporation unit and the multi-stage waste heat power generation unit, waste heat carried in coal gasification black water is subjected to graded conversion and utilization, and low-grade steam which is a black water flash evaporation byproduct is used for generating power, so that the waste heat is recycled, the energy utilization efficiency of the system is improved, and the energy consumption of the system is reduced. The purposes of energy conservation and consumption reduction of the coal gasification process are achieved, and production cost is saved.

The application relates to a multistage flash evaporation acid liquid recycling system, which comprises a preheating unit, a high-pressure reaction kettle, a flash evaporation unit and a gas-liquid separator. The preheating unit comprises at least one preheating tower which is communicated with a first feeding port of the high-pressure reaction kettle and is used for preheating ore pulp. The flash evaporation unit comprises at least one flash evaporation tank which is communicated with a first discharging port of the high-pressure reaction kettle and is used for flash evaporation of the reacted ore pulp. The steam outlet of the flash evaporation tank is communicated with a heat exchanger of the preheating tower through a steam pipe, and the gas-liquid separator is arranged on the steam pipe and is used for separating sulfuric acid liquid drops in water vapor. Compared with the prior art, the multistage flash evaporation acid liquid recycling system provided by the application is provided with the gas-liquid separator on the steam pipeline of the flash evaporation tank, sulfuric acid in steam is separated and recovered, only the pipeline before the gas-liquid separator needs to be subjected to corrosion prevention treatment, scaling of the preheating tower is avoided, the cost of pipeline corrosion prevention treatment is reduced, and waste of sulfuric acid is reduced.

The invention relates to the technical field of seawater desalination, and specifically discloses a seawater desalination system and method coupled with multi-stage flash evaporation and multi-effect distillation, comprising a multi-stage flash tank and a multi-stage flash coupling tank, wherein each stage of the flash tank corresponds to a flash coupling tank; the flash coupling tank comprises a first flash chamber, a reheater, a sprayer and a flash assembly which are arranged in sequence from bottom to top, wherein the fresh water generated by condensation of the flash tank enters the reheater of the corresponding flash coupling tank, the sprayer sprays the seawater entering the flash coupling tank of this stage from the outside on the steam generated by the reheater, and the steam generated by the sprayer is condensed into fresh water under the action of the flash assembly, and the unevaporated seawater falls into the first flash chamber; the invention couples the multi-stage flash evaporation with the multi-effect distillation, and can make full use of the waste heat of fresh water generated by condensation of the existing flash tank, thereby improving the energy efficiency ratio of the system and increasing the fresh water output.

The present application relates to a multi-stage flash evaporation acid recovery system, which includes a preheating unit, a high-pressure reaction kettle, a flash evaporation unit, and a gas-liquid separator. The preheating unit comprises at least one preheating tower that is connected to the first feed port of the high-pressure reaction kettle for preheating the slurry. The flash evaporation unit includes at least one flash evaporation tank that is connected to the first discharge port of the high-pressure reaction kettle for flash evaporation of the post-reaction slurry. The steam outlet of the flash evaporation tank is connected via a steam pipe to the heat exchanger of the preheating tower. A gas-liquid separator is mounted on the steam pipe to separate sulfuric acid droplets from the steam. Compared to existing technology, the multi-stage flash evaporation acid recovery system provided by this application features a gas-liquid separator on the steam pipe of the flash evaporation tank, which separates and recovers the sulfuric acid from the steam. This design requires only the pipeline in front of the gas-liquid separator to be treated for corrosion resistance, thus avoiding scaling in the preheating tower, reducing the cost of pipeline corrosion treatment, and minimizing the waste of sulfuric acid.

The application relates to a self-heating multi-effect evaporation device, belonging to the technical field of multi-effect evaporation, wherein a primary-effect medium circulation pipeline is arranged on a flash evaporation unit of a primary effect, the flash evaporation units of the remaining effects are connected in series through pipelines, the medium outlet of a flash evaporation unit of a last effect is connected with the medium inlet of a heat exchange unit of a penultimate effect, the tube passes of multiple heat exchange units are connected in series, the medium outlet of a heat exchange unit of a primary effect is connected with the medium inlet of a flash evaporation unit of a penultimate primary effect through a pipeline, and a cooling circulation pipeline is arranged on the heat exchange unit of the last effect. The application recycles complex high-pollution waste heat as a driving heat source, realizes energy saving and carbon reduction, reduces energy consumption, and reduces operation cost, simultaneously adopts an equivalent flash evaporation self-heating mode, realizes multi-stage serial heating and multi-stage flash evaporation, completely separates waste water heating from flash evaporation, and solves problems such as large steam pipelines and complex pipeline routes.

The utility model discloses a novel boiler continuous drainage self-heating desalting system which comprises a heating evaporation and water supply system, a saline water discharging and cooling circulation system, a finished product water discharging system, a cold air system and a vacuum system. The heating evaporation and water supply system comprises a continuous blowdown flash tank, a flash tank, an evaporator and an air-cooled condenser which are connected in sequence, the evaporator is a multi-effect evaporator, the steam output end of the flash tank is connected with the steam input end of a first-effect evaporator of the evaporator, and the water drainage end of the flash tank is connected with a water spraying device of the first-effect evaporator of the evaporator; and the constant-drainage flash tank is connected with a water spraying device of a second-effect evaporator of the evaporator through a constant-drainage hot water pipeline. According to the scheme, a low-temperature multi-effect process mode and a multi-stage flash evaporation process mode are combined, heat of regular discharge and continuous discharge of the power plant is recycled, regular discharge and continuous discharge waste water is utilized for multiple times according to corresponding attributes in a grading mode, heat source loss is reduced, and the energy utilization rate is increased.

The invention discloses an aluminum oxide evaporation multi-stage flash tank control method based on model control, and the control method is used for stably and accurately controlling the temperature difference, liquid level and pressure parameters of each stage of flash tank in an evaporation process. The MPC model predictive control system intelligently analyzes the change of multi-parameter data to realize the output of control data, and module combination application can be carried out on different evaporation technological processes through a universal evaporation multistage flash tank MPC control module. Through a universal evaporation multistage flash tank MPC control module, a control method that a flash tank only controls a single parameter liquid level in a traditional method is changed into liquid level, temperature and pressure multi-parameter cooperative control. According to the method, the influence of multiple parameters on the flash evaporation intensity is considered, the problems that the aluminum oxide evaporation multi-stage flash evaporation tank is large in control fluctuation and prone to scabbing are solved, the control precision can be improved, the recovery amount of secondary steam is more stable, local concentrated scaling is avoided, and the equipment operation rate is increased.

The utility model relates to the technical field of waste heat recovery, and discloses a black water waste heat efficient power generation system which comprises a multi-stage flash evaporation device, a heat exchange device, a power generation device and a condensation recovery device. The heat exchange device is used for receiving flash evaporation steam generated by the multi-stage flash evaporation device, carrying out heat exchange and condensing the flash evaporation steam into liquid, and the power generation device is used for receiving clean steam generated by the heat exchange device for power generation; and the condensation recovery device is used for cooling the non-condensable gas and steam generated by the multi-stage flash evaporation device and the heat exchange device, recovering condensed water and disposing the non-condensable gas. According to the utility model, the multi-stage flash evaporation device is adopted to carry out stage-by-stage flash evaporation treatment on the high-temperature black water produced by the gasification furnace to generate flash evaporation steam with different pressures, so that waste heat resources in the black water are fully utilized, and the utilization rate of the waste heat of the black water is improved.

The invention relates to the technical field of wastewater deamination, in particular to a multi-stage flash evaporation deamination system and process. The multi-stage flash evaporation deamination system comprises a multi-stage flash evaporation deamination tower, the multi-stage flash evaporation deamination tower is connected with a Venturi water ejector through a pipeline, and a condenser is arranged on the pipeline between the multi-stage flash evaporation deamination tower and the Venturi water ejector. According to the invention, wastewater deamination and ammonium sulfate preparation processes can be realized, a plurality of flash steam condensers are additionally arranged on the basis of existing multistage flash heat pump rectification deamination, the condensers can condense flash steam before the flash steam enters the Venturi water jet pump, the jet water quantity required by the Venturi water jet pump is reduced, the power of a circulating pump is reduced, and the energy consumption is reduced. The air exhaust capacity of the Venturi water ejector is improved, so that the flash evaporation capacity of the flash evaporation section is further improved, the deamination effect is improved, and meanwhile, the operation energy consumption in the deamination process can be greatly reduced.

As the world becomes short of quality drinking water, the desalination of seawater has become increasingly important. The most common commercial processes of seawater desalination, reverse osmosis (SWRO) and multi-stage flash (MSF) distillation, are both technically difficult and costly, both in terms of equipment and energy demand. In order to address this problem, a novel, and relatively simple, sub-boiling, sparging method is proposed here, which uses a continuous flow of helium gas to remove water vapour from seawater, so that desalinated water can be condensed and collected and the sparging gas, helium, be recycled. Optimum separation conditions are achieved by continuous direct heating of the seawater, during sparging, to maintain an operating temperature of about 80 deg C. This sparging method could also be used to sterilise contaminated wastewater.

The present application relates to the technical field, especially to a seawater desalination method, comprising using water vapor generated by a multi-stage flash module and water vapor generated by a forced circulation module to preheat seawater liquid into the multi-stage flash module; using a multi-stage flash unit to multi-stage flash the preheated seawater, to obtain water vapor and concentrated concentrated brine; using water vapor generated by the forced circulation module to preheat the concentrated concentrated brine and input the preheated concentrated concentrated brine into a crystallization module; using the forced circulation module to apply negative pressure to the crystallization module, so that the concentrated concentrated brine realizes brine separation below 100 DEG C. The use of the forced circulation evaporator and the subsequent steam to heat the flash water reduces the overall energy consumption, realizes zero discharge of waste water and waste gas; the use of the sunlight modulation technology improves the solar energy utilization rate, and compared with mechanical forced circulation, can greatly reduce the power consumption and reduce the overall energy consumption.

The invention relates to a self-heating multi-effect evaporation device, and belongs to the technical field of multi-effect evaporation, a first-effect medium circulation pipeline is arranged on a first-effect flash evaporation unit, other-effect flash evaporation units are connected in series through pipelines, a medium outlet of a last-effect flash evaporation unit is connected with a medium inlet of a heat exchange unit located at the second last effect, and a medium outlet of the heat exchange unit located at the second last effect is connected with a medium outlet of the heat exchange unit. The tube passes of the multiple heat exchange units are connected in series, a medium outlet of the heat exchange unit located at the first effect is connected with a medium inlet of the flash evaporation unit located at the second first effect through a pipeline, and a cooling circulation pipeline is arranged on the heat exchange unit located at the last effect. Complex high-pollution waste heat is recycled to serve as a driving heat source, the purposes of saving energy, reducing carbon, reducing energy consumption and reducing operation cost are achieved, meanwhile, an equivalent flash evaporation self-heating mode is adopted, multi-stage series heating and multi-stage flash evaporation are achieved, complete separation of waste water heating and flash evaporation is achieved, and the problems that a steam pipeline is large, and the pipeline trend is complex are solved.

This invention discloses a high-temperature-rise slurry waste heat recovery composite heat pump heating system. The system includes a high-pressure flash condensation device (1), a low-pressure flash condensation device (3), an absorption heat pump (4), a cascade heat recovery compression refrigeration circuit, and a condensate tank (7). The slurry undergoes initial flash evaporation in the high-pressure flash condensation device (1), and the generated gas is absorbed by the condensate from the condensate tank (7). The slurry then enters the low-pressure flash condensation device (3) for multi-stage flash evaporation. The first-stage flash evaporation steam enters the evaporator (E) of the absorption heat pump (4). Simultaneously, the circuit consisting of the compressor (6), expansion valve (5), and the low-pressure condenser (as the evaporator) recovers the subsequent flash evaporation heat and also delivers it to the evaporator (E). Driven by an external heat source, the absorption heat pump (4) utilizes the low-temperature heat of the evaporator (E) to heat the heating circuit through the absorber (A) and condenser (C). This invention achieves efficient recovery of slurry waste heat and high-temperature-rise heating, and effectively solves the problems of non-condensable gas treatment and condensate reuse.

The utility model discloses a gibbsite flash-evaporation-free dissolution system which comprises a heat exchanger A1, a cold source outlet of the heat exchanger A1 is connected with a cold source inlet of a heat exchanger B2 through a pipeline, a cold source outlet of the heat exchanger B2 is connected with a cold source inlet of a heat exchanger C3 through a pipeline, and a cold source outlet of the heat exchanger C3 is connected with an inlet of a heat preservation staying system through a pipeline. An outlet of the heat preservation staying system is connected with a heat source inlet of the heat exchanger A1 through a pipeline, and heat source inlets of the heat exchanger B2 and the heat exchanger C3 are further connected with a heat source. According to the flash-free system disclosed by the utility model, a multi-stage flash evaporator, a secondary steam condensate water tank, a water cooler, a matched vacuum system and the like as well as related pipelines and accessories for connecting the equipment and the system are omitted, so that the power consumption of the equipment and the corresponding investment and operation and maintenance cost are reduced, and meanwhile, the heat dissipation loss of the system caused by the links is also eliminated. Therefore, the energy utilization efficiency is improved, the consumption of fresh steam is reduced, and the economic benefits and environmental protection benefits of the whole dissolution process are improved to a certain extent.

The utility model discloses a desulfurization slurry flash evaporation MVR heat pump type flue gas deep waste heat recovery system, and belongs to the technical field of coal-fired boiler waste heat heat supply. In view of the fact that a large amount of non-condensable gas such as SO2 can be generated during desulfurization slurry flash evaporation, and high vacuum degree is difficult to maintain by conventional vacuum-pumping equipment and processes, the MVR compressor is adopted to recompress desulfurization slurry flash steam so as to improve steam pressure and energy grade. Desulfurization slurry can be subjected to one-stage or multi-stage flash evaporation, the front flash evaporation tank is used for carrying out negative pressure flash evaporation, and flash evaporation steam enters the front heater to carry out first-stage preheating on heat supply network return water; flash steam of the MVR flash tank is compressed through MVR, the steam pressure and temperature are increased, then the compressed flash steam is fed into the MVR heater to conduct MVR heating on heat supply network return water, and the outlet water temperature of heated water can be greatly increased. And non-condensable gas on the liquid level of condensed water of the front heater is fed into the MVR compressor so as to keep the required vacuum degree. And non-condensable gas of the MVR heater is pumped out by a conventional vacuum pump and sent to an inlet of the original desulfurization tower.

The invention discloses a production process of a sodium hypochlorite disinfectant, which comprises the following steps: preparing and pretreating raw materials, electrolyzing to generate sodium hypochlorite, concentrating and purifying, stabilizing, filtering and filling, and detecting and recording quality, namely dissolving industrial salt with the purity of at least 99.5% in deionized water, and stirring and heating to promote dissolution; the method comprises the following steps: adding iodized salt into a sodium hypochlorite solution to obtain a uniform solution without iodized salt, concentrating the sodium hypochlorite solution through a multi-stage flash evaporation or vacuum concentration technology, selecting a proper stabilizer to be mixed with the sodium hypochlorite solution, adding a catalyst, and filtering the stabilized sodium hypochlorite solution by using a high-precision filter. By optimizing the raw material preparation and pretreatment steps, the purity and uniformity of the raw materials are improved; by controlling electrolysis conditions, the stability and efficiency of the electrolysis process are ensured; the purity and the stability of the product are improved through the steps of concentration and purification; and through stabilizing treatment, the stability of the sodium hypochlorite is further enhanced.

The invention relates to the technical field of CO2 heat pump steam generators, in particular to a multi-stage flash steam generation system based on a CO2 transcritical heat pump, which comprises a CO2 transcritical heat pump with a plurality of heat exchangers which are sequentially connected in series, and each stage of heat exchanger is connected with a flash steam generation circulation system. Working medium water of the flash steam generation circulating system exchanges heat with a high-temperature CO2 working medium generated by the CO2 transcritical heat pump through the heat exchanger to be heated, the heated working medium water enters the flash tank to be subjected to flash evaporation to form steam and water with the temperature and the pressure reduced, and the working medium water with the temperature and the pressure reduced returns to the heat exchanger to be subjected to heat exchange after being pressurized through the booster water pump. Irreversible loss caused by single-stage flash evaporation is effectively reduced, working medium water is subjected to phase change in sequence under different pressures, the average temperature of water in the whole heat absorption process is increased, the heat exchange temperature difference between water and CO2 is reduced, CO2 thermodynamic characteristics are gradually matched, # imgabs0 # loss caused by large heat exchange temperature difference is reduced, and the overall performance of the system is improved.

The invention provides a coal gasification black water treatment method. Comprising the following steps: S1, carrying out multi-stage flash evaporation on coal gasification black water to obtain a first residual liquid; s2, a first water treatment agent is added into the first residual liquid for a reaction, and first reaction liquid is obtained; s3, enabling the first reaction liquid to pass through a final-stage flash evaporation pump of multi-stage flash evaporation to obtain second residual liquid; s4, a second water treatment agent is added into the second residual liquid for a reaction, and second reaction liquid is obtained; s5, after the second reaction liquid enters a clarifying tank to be subjected to sedimentation treatment, supernatant liquid and sediment are obtained; the first water treatment agent is an inorganic coagulant, and the second water treatment agent is an organic polymeric flocculant. The method has certain hardness and silicon removal performance while reducing the turbidity of the coal gasification black water and reducing suspended solids in the coal gasification black water, can effectively improve the water quality of the gasification circulating grey water, and greatly improves the operability and stability of industrial production.

The invention discloses an island multi-energy integrated light heat and power cogeneration system, relates to the technical field of new energy utilization, and solves the problem of electricity, heat and fresh water supply under the conditions that an island is relatively closed and resources are deficient by utilizing rich renewable energy sources of the island, so that energy waste is reduced to the maximum extent, and the utilization rate of clean energy is improved. The system comprises a multi-energy integrated power generation module, a water electrolysis hydrogen production module, a combined heat and power supply module based on hydrogen energy and a multi-stage flash evaporation seawater desalination module based on solar photo-thermal, and offshore wind energy, solar energy, wave energy and a fuel cell technology are fused to cope with energy challenges in island regions. By introducing a fuel cell, a heat pump technology and a multi-stage flash evaporation seawater desalination technology, not only can electric power be provided, but also heat energy for heating and fresh water can be produced, and meanwhile, the system has good performance in the aspect of quick response starting through utilization and redistribution of waste heat of the system.

The invention relates to devices for individually extracting salts from salt solutions of various origin. The essence of the invention lies in a plant comprising a concentrating unit that includes a multi-stage flash evaporator containing stages having an expansion chamber and a condensation chamber, and at least two salt crystallization units, each of which contains a heater, a boiling chamber and a system for separating and discharging salts, wherein the flash evaporator expansion chamber and the heater, and also the boiling chamber and the flash evaporator expansion chamber, are connected to one another by steam delivery channels. The technical result consists in an increase in the energy efficiency of the plant.