CN114772665B - Continuous hydrate method sea water desalting device and method - Google Patents
Continuous hydrate method sea water desalting device and method Download PDFInfo
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
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- B01J19/00—Chemical, physical or physico-chemical processes in general; Their relevant apparatus
- B01J19/18—Stationary reactors having moving elements inside
- B01J19/20—Stationary reactors having moving elements inside in the form of helices, e.g. screw reactors
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B08—CLEANING
- B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
- B08B9/00—Cleaning hollow articles by methods or apparatus specially adapted thereto
- B08B9/08—Cleaning containers, e.g. tanks
- B08B9/087—Cleaning containers, e.g. tanks by methods involving the use of tools, e.g. brushes, scrapers
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B08—CLEANING
- B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
- B08B9/00—Cleaning hollow articles by methods or apparatus specially adapted thereto
- B08B9/08—Cleaning containers, e.g. tanks
- B08B9/093—Cleaning containers, e.g. tanks by the force of jets or sprays
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- B01J2219/00—Chemical, physical or physico-chemical processes in general; Their relevant apparatus
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/08—Seawater, e.g. for desalination
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- C—CHEMISTRY; METALLURGY
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- C02F2301/066—Overpressure, high pressure
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- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
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- Y02A20/124—Water desalination
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Abstract
The invention belongs to the technical field of sea water desalination, and relates to a continuous hydrate method sea water desalination device and a method, wherein two storage tanks, two winch-cage type reaction kettles and a decomposition reaction kettle which are respectively connected with the two storage tanks are used as main structures, the sea water is subjected to preliminary desalination through the generation-conveying-decomposition cycle of the hydrate, water with low salt content is generated by gas and water molecules in the sea water after the hydrate is decomposed, the two winch-cage type reaction kettles alternately operate to continuously generate and convey the hydrate, the two storage tanks alternately store the hydrate, the decomposition reaction kettles decompose the hydrate, and the three are matched together to realize the continuous process of generation, conveying and decomposition of the hydrate; the device has a simple structure, and two stranding cage type reaction kettles and two storage tanks are alternately operated in a clearance mode.
Description
Technical field:
the invention belongs to the technical field of sea water desalination, and particularly relates to a continuous hydrate method sea water desalination device and a continuous hydrate method sea water desalination method, wherein hydrate is used as a medium to carry out continuous sea water desalination.
The background technology is as follows:
with the increase of population, the problem of lack of fresh water resources is increasingly serious due to the development of economy. Sea is widely used as a resource, but cannot be directly used due to high salt content, and the sea water desalination is to remove redundant salt and mineral substances in sea water so as to obtain fresh water. At present, the sea water desalination technology mainly comprises multi-effect-multi-stage distillation, a permeation method, a freezing method and the like.
The distiller involved in the multi-effect distillation method has the following disadvantages: only a small amount of seawater can be desalinated at a time, and continuous production can not be realized; the inner wall of the distiller is covered by scale in a short time, and the distilling capacity is reduced; the heat used for distillation cannot be recovered for reuse. Based on the method, the low-temperature multi-effect distillation method has the advantages of low energy consumption, strong adjustability, small maintenance amount, small scaling tendency, low requirement on raw water pretreatment, low investment and the like, and has a certain market in the aspect of utilizing spent steam and waste heat to produce water.
The multistage flash evaporation method is the most widely applied technology in the distillation method, and the principle is that seawater enters a flash evaporation chamber after being preheated, the pressure of the flash evaporation chamber is lower than the saturated steam pressure corresponding to the brine to be entered, the brine is flashed due to overheating after entering, and the flashed steam is fresh water after condensation. The method has the advantages of mature process, small maintenance amount, low requirement on raw water pretreatment, long service life, good water outlet quality and high heat efficiency, but has the problems of high energy consumption, high engineering investment cost, easy pollution of the obtained fresh water, small elasticity of equipment operation and easy scaling and corrosion of equipment and pipelines.
The pressure steaming method uses a mechanical compressor to compress, boost and heat the steam, and is used as a heat source for heating and evaporating the seawater, and the pressure steaming method does not need to provide heating steam outside after operation, and converts mechanical energy into heat energy, and has the advantages of high process efficiency, low specific energy consumption, no need of cooling water and compact structure. However, the compressor has high cost, is easy to corrode and scale, and is difficult to further enlarge.
The freezing method is implemented at low temperature, the problems of corrosion and scaling are relatively mild, the pretreatment is simple, and the equipment investment is relatively small. However, the three-phase vapor generated in the process is difficult to remove, and the ice crystal grows continuously in the process of conveying the ice crystal, so that the pipeline is possibly blocked, and the salt content in the ice is possibly increased.
The reverse osmosis process of reverse osmosis method has the driving force of pressure, no phase change, and the reverse osmosis membrane has the function of screening, and has low energy consumption, and can remove various ions in sea water and particles larger than the ions, such as most of organic matters, colloid, viruses, suspended matters and the like. Compared with other methods, the method has the characteristics of simple equipment, small occupied area, investment saving, convenient operation, high efficiency, no phase change, no need of heating, low energy consumption, low operation cost, strong adaptability, wide application range and the like. However, the semipermeable membrane involved in the reverse osmosis method has a short lifetime, requires pretreatment for impurity removal, and has a limited operating pressure.
In recent years, sea water desalination by a hydrate method has been widely paid attention to, because of low desalination energy consumption, simple and reliable production equipment and low input cost, and hydration agents such as methane and the like have low solubility in water, are nontoxic, have no corrosiveness and have no scaling phenomenon, and the desalination process and the product have no pollution to the environment. However, it has the limitation of low water conversion and switching of different pressures/temperatures between the formation-decomposition processes. For example, chinese patent 201910201721.1 discloses a constant pressure continuous sea water desalination system based on a hydrate method, which comprises a sea water tank, a cooler, a hydrate generation chamber, a heat exchange type decomposer and a steam generator, wherein a circulating heat medium system is arranged between the heat exchange type decomposer and the steam generator; the seawater pool, the cooler, the hydrate generation chamber and the heat exchange type decomposer are sequentially connected through connecting pipelines, and the connecting pipelines are provided with flow control valves; a heat exchanger is connected between the sea water tank and the cooler; the hydrate generation chamber is a hollow cavity and is provided with a cooling seawater input port, a hydrate output port, a gasification cyclopentane input port and a concentrated seawater output port; a rotary drum filter is fixed in the inner cavity of the hydrate generation chamber; the rotary drum filter comprises a rotary drum and a scraping plate, a rotary drum shaft is arranged in the center of the rotary drum, and is fixed at the upper part of the hydrate generation chamber, and the lower part of the rotary drum is below the preset reaction liquid level of the hydrate generation chamber; a graphite layer is arranged on the outer side wall of the rotary drum; the scraper end of the scraper is arranged on the outer side wall of the upper part of the rotary drum, and the end part of the scraper is communicated with the hydrate output port; the cooling seawater input port is connected with the output end of the cooler; the hydrate output port is connected with the heat exchange type decomposer through a mixing pump, the output end of the heat exchange type decomposer comprises a liquid output end and a gas output end, wherein the liquid output end is connected with a fresh water storage tank, the gas output end is connected with a steam generator through a cyclopentane gas storage tank, and the steam generator is connected with the gasification cyclopentane input port through an air extracting pump; the concentrated seawater outlet is communicated with the refrigerant inlet end of the heat exchanger, and flow control valves are connected among the refrigerant outlet end of the heat exchanger, the cyclopentane gas storage tank and the steam generator; the circulating heat medium system comprises a solar heat collector and a heat storage device, wherein the solar heat collector is connected with the heat storage device, a first heat release component in the steam generator and a second heat release component in the heat exchange type decomposer in series through a heat medium conveying pipeline to form a heat medium circulating pipeline; a water pump and a one-way valve are arranged on the heat medium circulating pipeline; the sea water desalting system with gas hydrate method disclosed in Chinese patent 201810450599.7 comprises a first reaction kettle and a second reaction kettle, wherein the first reaction kettle and the second reaction kettle are respectively arranged in a first constant-temperature water bath tank and a second constant-temperature water bath tank, the first reaction kettle is communicated with a gas cylinder through a third valve and a seventeenth valve, and the second reaction kettle is communicated with the gas cylinder through a seventh valve and a seventeenth valve; the first reaction kettle is communicated with the second reaction kettle through a fifth valve, a gas circulating pump and a ninth valve; the axial flow pump is communicated with the liquid storage tank through an eleventh valve; the top ends of the first reaction kettle and the second reaction kettle are respectively provided with a stirring device, the pressure sensor and the temperature sensor on the first reaction kettle and the second reaction kettle are respectively connected with a data acquisition instrument, the first reaction kettle is connected with a piston booster through a fourth valve, the second reaction kettle is connected with the piston booster through an eighth valve, the piston booster is connected with a manual pressure metering pump, a water inlet pipe is connected with a fourteenth valve, the fourteenth valve is respectively connected with a twelfth valve and a thirteenth valve in two ways, the twelfth valve is connected with the first reaction kettle, the thirteenth valve is connected with the second reaction kettle, a fresh water outlet pipeline of the first reaction kettle is connected with the fifteenth valve through a second valve, a fresh water outlet pipeline of the second reaction kettle is connected with the fifteenth valve through a sixth valve, the first reaction kettle is connected with an axial flow pump through the first valve, the second reaction kettle is connected with the axial flow pump through an eighteenth valve, and the axial flow pump is connected with a liquid storage tank through an eleventh valve; the sea water desalination test device by a hydrate method disclosed in China patent 200810028555.1 comprises a hydrate generation and decomposition tubular reactor, wherein the upper half part of the reactor is provided with a fresh water output port, the higher part of the lower half part of the reactor is provided with a sea water input port, and the bottom of the reactor is provided with a concentrated sea water output port and a stirrer; the outer wall of the lower half part of the reactor is provided with a water jacket, and the reactor also comprises a gas circulation system for providing high-pressure gas for the reactor, wherein the gas circulation system comprises a gas circulation pipeline, one end of the gas circulation pipeline is communicated with the inside of the upper half part of the reactor, and the other end of the gas circulation pipeline is wound on the outer surface of the water jacket and is communicated with the inside of the lower half part of the reactor; the cooling system is used for providing a low-temperature environment for the reactor and comprises a cooling device and a cooling liquid circulation pipeline connected with the cooling device, and the cooling liquid circulation pipeline is communicated with the water jacket; the device adopted by the sea water desalination method based on the natural gas hydrate technology disclosed in Chinese patent 201410294573.X comprises: the device comprises a water pump, a hydrate decomposition device, a hydrate generation device, an ice particle supply box, a heat exchanger I, a heat exchanger II, a throttling filter device, a condensing device, a refrigeration compressor, a gas-liquid separation device, a gas buffer tank, a magnetic stirrer, an ice crystal mill, a conical rotating core and a liquid collection cavity; the water pump connects one part of seawater with the hydrate decomposing device through a water inlet pipeline, and the other part of seawater is connected with the heat exchanger I through a pipeline, after the two pipelines are gathered, the main pipeline is connected with the hydrate generating device, and the auxiliary pipeline is connected with the ice particle supply box to form a seawater flow module; the device comprises a throttling filter device, a condensing device, a refrigeration compressor and a gas compressor, wherein the refrigeration cycle module is formed by pipelines in sequence; the hydrate decomposing device, the hydrate generating device, the ice particle providing box, the magnetic stirrer and the ice crystal mill form a hydrate generating and decomposing module; sequentially connecting a reactor gas-liquid separation device with a gas compressor and a heat exchanger II through pipelines to form a natural gas circulation module; the gas-liquid separation device adopts a lower tapered spray pipe, a tapered rotary core is arranged in the middle, and liquid flows to the periphery of the pipe wall and enters the liquid collecting cavity. Therefore, the research and development design of the seawater desalination device and the seawater desalination method solves the technical problems, and the seawater is desalinated with high efficiency, convenience and continuity through a hydrate method.
The invention comprises the following steps:
the invention aims to overcome the defects of the prior art, develop and design a continuous hydrate method sea water desalination device and method, continuously generate, convey and decompose hydrate, and realize the double-function combination of hydrate generation and reaction kettle cleaning.
In order to achieve the above purpose, the main structure of the continuous hydrate method sea water desalting device provided by the invention comprises two storage tanks, and two stranding cage type reaction kettles and a decomposition reaction kettle which are respectively connected with the two storage tanks; adopting a multi-level arrangement mode, arranging a stranding cage type reaction kettle at the highest layer, arranging a storage tank at the middle layer and arranging a decomposition reaction kettle at the bottommost layer; when the device is used, the two stranding cage type reaction kettles alternately perform generation and conveying of hydrate and cleaning of the stranding cage type reaction kettles, the two storage tanks alternately perform storage of the hydrate, and the decomposition reaction kettles perform decomposition of the hydrate; the storage tank, the stranding cage type reaction kettle and the decomposition reaction kettle are matched together to realize continuous production, transportation and decomposition of the hydrate, and the primary desalination treatment of the seawater is completed.
Specifically, the main structure of the continuous hydrate method sea water desalting device comprises a left storage tank, a right storage tank, a left twisting cage type reaction kettle, a right twisting cage type reaction kettle, a lower pipeline and a decomposition reaction kettle; the inlet ends of the left storage tank and the right storage tank are connected with the outlet ends of the left-stranded cage type reaction kettle and the right-stranded cage type reaction kettle, and the outlet ends are connected with the inlet ends of the decomposition reaction kettle.
Furthermore, the inlet ends of the left storage tank and the right storage tank are connected with the outlet ends of the left-stranded cage type reaction kettle and the right-stranded cage type reaction kettle through upper pipelines of a cross structure, and the outlet ends are connected with the inlet ends of the decomposition reaction kettle through lower pipelines of a Y-shaped structure; the top ends of the left storage tank and the right storage tank are respectively provided with a storage tank air inlet, and the outer sides of the left storage tank and the right storage tank are respectively provided with a cooling jacket; the screws of the left-hand and right-hand strand cage type reaction kettles are driven by motors respectively, high-pressure water spray ports are respectively arranged at the top ends of the left-hand and right-hand strand cage type reaction kettles, the upper parts of the left-hand and right-hand strand cage type reaction kettles are respectively provided with a reactor air inlet, the lower parts of the left-hand and right-hand strand cage type reaction kettles are respectively provided with a liquid inlet, and the outer sides of the left-hand and right-hand strand cage type reaction kettles are respectively provided with jackets; an inner coil pipe is arranged in the decomposition reaction kettle, an exhaust port is arranged at the upper part of the decomposition reaction kettle, and a water outlet is arranged at the lower part of the decomposition reaction kettle; in addition, both high pressure water jets are connected to the spray line.
The invention relates to a continuous hydrate method sea water desalination device, which comprises the following technical processes of generating and conveying hydrate:
filling a predetermined amount of high-pressure gas and seawater into the wring-cage reaction kettle, driving a screw rod to rotate reversely through the reverse rotation of a motor, and simultaneously bringing the high-pressure gas into the seawater while rotating the screw rod reversely, so as to improve the dissolution amount of the high-pressure gas in the seawater and shorten the induction period of hydration reaction;
the high-pressure gas and the seawater are subjected to hydration reaction to obtain hydrate particles and brine, the screw is driven to rotate positively by the forward rotation of the motor, and the hydrate particles are conveyed to a storage tank after being taken out of the brine while the screw rotates positively;
the seawater which does not participate in the hydration reaction flows back through the gap between the screw and the inner wall of the wring cage type reaction kettle so as to improve the generation rate of hydrate particles.
The invention relates to a process for cleaning a twisted cage type reaction kettle of a continuous hydrate method sea water desalting device, which comprises the following steps:
the screw rod is driven to rotate reversely through the reverse rotation of the motor;
the water is sprayed out through a high-pressure water spray outlet by a spray pipeline to clean the inner walls of the screw and the stranding cage type reaction kettle;
the water and brine are discharged through the liquid inlet.
The invention relates to a continuous process for generating, conveying and decomposing hydrate by a seawater desalination device, which comprises the following steps:
when the first strand cage reaction kettle generates and conveys hydrate, the second strand cage reaction kettle does not act;
when the first strand cage type reaction kettle performs self-cleaning, the second strand cage type reaction kettle performs hydrate generation and transportation;
when the first strand cage reaction kettle generates and conveys the hydrate again, the second strand cage reaction kettle carries out self-cleaning;
...
When the first storage tank is full, the second storage tank is used for storing, and the first storage tank and the second storage tank are alternately used for storing;
the decomposition reaction vessel 7 continuously carries out the decomposition of the hydrate.
The sea water desalting device can carry out high-pressure gas solubilization, hydrate transportation and cleaning of the wring cage type reaction kettle through the positive and negative rotation of the screw rod; when the blade interval of the screw is wide at the bottom and narrow at the upper part, the hydrate can be extruded and dehydrated in the transportation process; when the blade spacing of the screw is arranged at equal intervals, the hydrate can be prepared in batches, the blade spacing is 1-5cm, and the screw can be prevented from being blocked; the rotation speed of the screw is 5-50 revolutions per minute, and the rotation mode comprises forward rotation and reverse rotation; the high pressure gas includes carbon dioxide, methane, ethane and propane.
Compared with the prior art, the invention takes two storage tanks and two stranding cage type reaction kettles and one decomposition reaction kettle which are respectively connected with the two storage tanks as main structures, and utilizes the salt discharging effect in the hydrate generation process to carry out preliminary desalination on sea water through the generation-conveying-decomposition cycle of the hydrate, the gas and water molecules in the sea water generate the hydrate, the hydrate is decomposed to obtain water with low salt content, the two stranding cage type reaction kettles alternately operate to continuously generate and convey the hydrate, the two storage tanks alternately store the hydrate, the decomposition reaction kettles carry out the decomposition of the hydrate, and the three are matched together, so that the continuous process of the generation, the conveying and the decomposition of the hydrate is realized, in addition, the self-cleaning of the stranding cage type reaction kettles can be also carried out through the inversion of a screw rod and the water spraying of a high-pressure water spraying port; the device has a simple structure, the two stranding cage type reaction kettles and the two storage tanks are alternately operated in a clearance mode, and the generation, the conveying and the decomposition of the hydrate are continuously carried out, so that the high efficiency, the convenience and the continuity of the sea water desalination by a hydrate method with gas as a guest molecule are realized, and the intermittent problem of the generation of the hydrate is solved.
Description of the drawings:
fig. 1 is a schematic main structure of a seawater desalination plant according to the present invention.
Fig. 2 is a schematic structural view of a screw according to the present invention.
Fig. 3 is a schematic diagram of the enhanced gas-liquid mixing at the time of screw inversion according to the present invention.
Fig. 4 is a schematic diagram of the transport of hydrates during forward rotation of the screw according to the present invention.
Fig. 5 is a schematic diagram of a cleaning cage reactor during screw reverse rotation according to the present invention.
The specific embodiment is as follows:
the invention is further illustrated by the following examples in conjunction with the accompanying drawings.
Example 1:
the main structure of the continuous hydrate method sea water desalting device related to the embodiment is shown in fig. 1, and comprises a left storage tank 1, a right storage tank 2, an upper pipeline 3, a left twisted cage type reaction kettle 4, a right twisted cage type reaction kettle 5, a lower pipeline 6, a decomposition reaction kettle 7, a storage tank air inlet 8, a cooling jacket 9, a screw 10, a motor 11, a high-pressure water spray port 12, a spray pipeline 13, a reactor air inlet 14, a liquid inlet 15, a jacket 16, an inner coil 17, an inlet 18, an outlet 19, an air outlet 20, a water outlet 21 and a valve 22; the inlet ends of the left storage tank 1 and the right storage tank 2 are connected with a left stranding cage type reaction kettle 4 and a right stranding cage type reaction kettle 5 through an upper pipeline 3 with a cross-shaped structure, and the outlet ends of the left storage tank 1 and the right storage tank 2 are connected with a decomposition reaction kettle 7 through a lower pipeline 6 with a Y-shaped structure; the top ends of the left storage tank 1 and the right storage tank 2 are respectively provided with a storage tank air inlet 8, and the outer sides of the left storage tank 1 and the right storage tank 2 are respectively provided with a cooling jacket 9; the screw rods 10 of the left-hand and right-hand strand-and-drum type reaction kettles 4 and 5 are respectively driven by a motor 11, the top ends of the left-hand and right-hand strand-and-drum type reaction kettles 4 and 5 are respectively provided with a high-pressure water jet 12, the two high-pressure water jet 12 are connected through a spray pipeline 13, the upper parts of the left-hand and right-hand strand-and-drum type reaction kettles 4 and 5 are respectively provided with a reactor air inlet 14, the lower parts of the left-hand and right-hand strand-and-drum type reaction kettles 4 and 5 are respectively provided with a liquid inlet 15, and the outer sides of the left-hand and right-hand strand-and-drum type reaction kettles 4 and 5 are respectively provided with a jacket 16; an inner coil 17 is arranged in the decomposition reaction kettle 7, the inner coil 17 is provided with an inlet 18 and an outlet 19, an exhaust port 20 is arranged at the upper part of the decomposition reaction kettle 7, and a water outlet 21 is arranged at the lower part of the decomposition reaction kettle 7; the inlet of the left storage tank 1 and the right storage tank 2 on the upper pipeline 3, the outlet of the left cage reaction kettle 4 and the right cage reaction kettle 5, the outlet of the left storage tank 1 and the right storage tank 2 on the lower pipeline 6, the storage tank air inlet 8, the high-pressure water spraying port 12 on the spraying pipeline 13, the reactor air inlet 14 and the liquid inlet 15 are all provided with valves 22.
The specific process of the continuous hydrate method sea water desalting device for sea water desalting comprises the following steps:
the high-pressure gas 100 enters the left-hand lay-cage reaction kettle 4 through the air inlet 14, the seawater 200 enters the left-hand lay-cage reaction kettle 4 through the liquid inlet 15, the motor 11 reverses and drives the screw 10 to reverse, the screw 10 reverses and brings the high-pressure gas 100 into the seawater 200, the contact area between gas and liquid is enhanced, and the temperature of the left-hand lay-cage reaction kettle 4 is regulated to the reaction temperature by controlling the temperature of the refrigerant in the jacket 16;
when the high-pressure gas 100 is nucleated in the seawater 200 and is hydrated to generate hydrate particles 300 and brine 400, the motor 11 is adjusted to rotate positively, the screw 10 brings the hydrate particles 300 out of the seawater 200 while driving the motor 11 to rotate positively, and the seawater 200 which does not participate in the reaction flows into the brine 400 at the bottom of the left-hand lay-cage reactor 4 in the process that the hydrate particles 300 are continuously lifted and extruded;
when the hydration reaction reaches the set conversion rate, opening a left storage tank 1, cooling the left storage tank 1 through a cooling jacket 9, injecting gas through a storage tank gas inlet 8, wherein the pressure of the left storage tank 1 is lower than that of a left-strand cage reaction kettle 4, and hydrate particles 300 enter the left storage tank 1 under the action of lifting and pushing of a screw 10 and the pressure difference between the left storage tank 1 and the left-strand cage reaction kettle 4;
the right-hand wring-cage reaction kettle 5 is used for generating and conveying hydrate particles 300 through the same operation, the right storage tank 2 is used for storing the hydrate particles 300, meanwhile, the high-pressure water spray port 12 is opened, the motor 11 of the left-hand wring-cage reaction kettle 4 is adjusted to rotate reversely, the screw rod 10 is rotated reversely, water is driven to self-clean the screw rod 10 and the inner wall of the left-hand wring-cage reaction kettle 4, and the water and brine 400 are discharged out of the left-hand wring-cage reaction kettle 4 through the liquid inlet 15;
the left-hand cage reactor 4 again generates and conveys hydrate particles 300, and the right-hand cage reactor 5 is self-cleaned;
... With this cycle;
when the left storage tank 1 and the right storage tank 2 are alternately stored and decomposed, normal-temperature seawater is used as hot fluid to be introduced into the inner coil 17 from the inlet 18, hydrate particles 300 enter the decomposition reaction kettle 7 under the action of pressure difference and gravity between the left storage tank 1 or the right storage tank 2 and the decomposition reaction kettle 7, are decomposed under the action of pressure relief and heating of the inner coil 17 to obtain gas and fresh water, the gas is discharged through the exhaust port 20, and the fresh water is discharged through the water outlet 21;
the gas discharged from the gas outlet 20 enters the left storage tank 1 and the right storage tank 2 again through the storage tank gas inlet 8 for stabilizing the pressure, or enters the left stranding cage type reaction kettle 4 and the right stranding cage type reaction kettle 5 again through the gas inlet 14 for hydration reaction after being pressurized.
The left tank 1 and the right tank 2 according to the present embodiment alternately operate under the condition of low pressure and low temperature, the pressure being to prevent the hydrate particles 300 from being rapidly decomposed due to a large pressure drop, and the low temperature being to prevent the hydrate particles 300 from being rapidly decomposed due to heat; the left-hand lay cage reactor 4 and the right-hand lay cage reactor 5 alternately perform generation, transportation and self-cleaning of the hydrate particles 300 under the conditions of high pressure and low temperature so as to realize continuous production, transportation and decomposition of the hydrate particles 300, and because the hydrate is required to be generated under the low-temperature high-pressure environment and stored under the ultralow-temperature normal-pressure condition, the hydrate transportation process is required to be firstly subjected to cooling treatment and then to pressure relief operation, so that the hydrate can only adopt an intermittent production mode; the decomposition reaction kettle 7 operates under normal pressure and normal temperature; the three remain relatively independent.
Claims (6)
1. The continuous hydrate method sea water desalting device is characterized by comprising two storage tanks, two stranding cage type reaction kettles and a decomposition reaction kettle, wherein the stranding cage type reaction kettles and the decomposition reaction kettle are respectively connected with the two storage tanks; when the device is used, the two stranding cage type reaction kettles alternately perform generation and conveying of hydrate and cleaning of the stranding cage type reaction kettles, the two storage tanks alternately perform storage of the hydrate, and the decomposition reaction kettles perform decomposition of the hydrate; the technical process for generating and conveying the hydrate comprises the following steps:
filling a predetermined amount of high-pressure gas and seawater into the wring-cage reaction kettle, driving a screw rod to rotate reversely through the reverse rotation of a motor, and simultaneously bringing the high-pressure gas into the seawater while rotating the screw rod reversely, so as to improve the dissolution amount of the high-pressure gas in the seawater and shorten the induction period of hydration reaction;
the high-pressure gas and the seawater are subjected to hydration reaction to obtain hydrate particles and brine, the screw is driven to rotate positively by the forward rotation of the motor, and the hydrate particles are conveyed to a storage tank after being taken out of the brine while the screw rotates positively;
the seawater which does not participate in the hydration reaction flows back through the gap between the screw and the inner wall of the stranding cage type reaction kettle so as to improve the generation rate of hydrate particles; the technical process for cleaning the stranding cage type reaction kettle comprises the following steps:
the screw rod is driven to rotate reversely through the reverse rotation of the motor;
the water is sprayed out through a high-pressure water spray outlet by a spray pipeline to clean the inner walls of the screw and the stranding cage type reaction kettle;
the water and brine are discharged through the liquid inlet; the continuous process for realizing the generation, the transportation and the decomposition of the hydrate comprises the following steps:
when the first strand cage reaction kettle generates and conveys hydrate, the second strand cage reaction kettle does not act;
when the first strand cage type reaction kettle performs self-cleaning, the second strand cage type reaction kettle performs hydrate generation and transportation;
when the first strand cage reaction kettle generates and conveys the hydrate again, the second strand cage reaction kettle carries out self-cleaning;
...
When the first storage tank is full, the second storage tank is used for storing, and the first storage tank and the second storage tank are alternately used for storing;
the decomposition reaction kettle continuously carries out the decomposition of the hydrate.
2. The continuous hydrate process sea water desalting device according to claim 1, wherein the multi-level arrangement mode is adopted, the stranding cage type reaction kettle is arranged at the highest layer, the storage tank is arranged at the middle layer, and the decomposition reaction kettle is arranged at the bottommost layer.
3. The continuous hydrate process sea water desalting device according to claim 1 or 2, wherein the main structure comprises a left storage tank, a right storage tank, a left strand cage reaction kettle, a right strand cage reaction kettle, a lower pipeline and a decomposition reaction kettle; the inlet ends of the left storage tank and the right storage tank are connected with the outlet ends of the left-stranded cage type reaction kettle and the right-stranded cage type reaction kettle, and the outlet ends are connected with the inlet ends of the decomposition reaction kettle.
4. A continuous hydrate process sea water desalinating device according to claim 3, wherein the inlet ends of the left storage tank and the right storage tank are connected with the outlet ends of the left-hand lay cage type reaction kettle and the right-hand lay cage type reaction kettle through upper pipelines of a cross type structure, and the outlet ends are connected with the inlet ends of the decomposition reaction kettles through lower pipelines of a Y-shaped structure; the top ends of the left storage tank and the right storage tank are respectively provided with a storage tank air inlet, and the outer sides of the left storage tank and the right storage tank are respectively provided with a cooling jacket; the screws of the left-hand and right-hand strand cage type reaction kettles are driven by motors respectively, high-pressure water spray ports are respectively arranged at the top ends of the left-hand and right-hand strand cage type reaction kettles, the upper parts of the left-hand and right-hand strand cage type reaction kettles are respectively provided with a reactor air inlet, the lower parts of the left-hand and right-hand strand cage type reaction kettles are respectively provided with a liquid inlet, and the outer sides of the left-hand and right-hand strand cage type reaction kettles are respectively provided with jackets; an inner coil pipe is arranged in the decomposition reaction kettle, an exhaust port is arranged at the upper part of the decomposition reaction kettle, and a water outlet is arranged at the lower part of the decomposition reaction kettle; in addition, both high pressure water jets are connected to the spray line.
5. A continuous hydrate process sea water desalinating apparatus according to any one of claims 1 to 3, wherein high pressure gas solubilisation, hydrate transport and cleaning of the wring cage reactor are enabled by forward and reverse rotation of the screw; when the blade interval of the screw is wide at the bottom and narrow at the upper part, the hydrate can be extruded and dehydrated in the transportation process; when the blade spacing of the screw is arranged at equal intervals, the hydrate can be prepared in batches, the blade spacing is 1-5cm, and the screw can be prevented from being blocked; the rotation speed of the screw is 5-50 revolutions per minute, and the rotation mode comprises forward rotation and reverse rotation.
6. A continuous hydrate process desalination plant according to any one of claims 1-3 wherein the high pressure gas comprises carbon dioxide, methane, ethane and propane.
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