CN106745369B - Overflow type continuous hydrate method seawater desalination device - Google Patents
Overflow type continuous hydrate method seawater desalination device Download PDFInfo
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- CN106745369B CN106745369B CN201611116086.XA CN201611116086A CN106745369B CN 106745369 B CN106745369 B CN 106745369B CN 201611116086 A CN201611116086 A CN 201611116086A CN 106745369 B CN106745369 B CN 106745369B
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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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- 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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Abstract
The invention belongs to the technical field of hydrate application, and discloses an overflow type continuous hydrate method seawater desalination device. The overflow type continuous hydrate method seawater desalination device comprises a reaction generator, a hydrate decomposer, a spraying system, a gas circulation system, a water circulation system and a high-concentration seawater recovery system, the hydrate and the solution are separated by utilizing the characteristic of different densities of the hydrate and the seawater, the technology of hydrate seawater desalination can be industrialized, the hydrate generation and decomposition devices are combined into the same container, the controllable turnover type opening and closing device is utilized, the utilization efficiency of materials is improved, and the problem of pore blockage caused by hydrate generation is effectively avoided. High-concentration seawater is discharged and is re-introduced into the seawater while the low-temperature seawater is sprayed, and the next circulating hydrate generation process is prepared in the inner reaction generator, so that the circulating production of fresh water by a hydrate method can be realized.
Description
Technical Field
The invention belongs to the technical field of hydrate application, and relates to an overflow type continuous hydrate method seawater desalination device.
Background
With the increasing consumption of fresh water resources around the world, the problem of fresh water is becoming a serious problem for many countries and regions. The seawater resource is very rich, and the seawater desalination is an effective solution. The common methods for seawater desalination include low-temperature multi-effect distillation, multi-stage flash evaporation and membrane reverse osmosis, while the hydrate method for seawater desalination has the technical advantages of low energy consumption, simple and compact equipment, and good application prospect.
The principle of the hydrate method for seawater desalination is to utilize the salt elimination effect in the hydrate generation process, one of the technical characteristics of the method is to separate the generated hydrate from seawater, however, the hydrate solid-liquid separation technology is always the technical bottleneck in the field, the hydrate separation effect is not good, and the like, and the water quality of the desalinated water is reduced.
The invention adopts a simple and effective scheme, provides the overflow type continuous hydrate method seawater desalination device, realizes the continuous separation of hydrate crystals, and has great significance for accelerating the practical application of hydrate method seawater desalination.
Disclosure of Invention
The invention provides an overflow type continuous hydrate method seawater desalination device, which provides a device capable of realizing industrialization for seawater desalination based on a hydrate method, improves the production efficiency, and can recycle spray water.
The technical scheme of the invention is as follows:
an overflow type continuous hydrate method seawater desalination device comprises a reaction generator, a hydrate decomposer, a spraying system, a gas circulation system, a water circulation system and a high-concentration seawater recovery system;
the reaction generator comprises an outer reaction generator 1 and an inner reaction generator 2, the inner reaction generator 2 is arranged in the outer reaction generator 1, and both the outer reaction generator 1 and the inner reaction generator are made of high-pressure-resistant stainless steel; a refrigeration coil 3 is arranged in the inner reaction generator 2 to provide a low-temperature environment required by hydrate generation, the opening position of the refrigeration coil is communicated with the outer reaction generator 1, and a liquid level sensor 13 is arranged on the inner wall of the refrigeration coil; the internal reaction generator 2 is communicated with a seawater storage tank 4 through a water pump 6 and a third one-way valve 7-3, and the water inflow is automatically adjusted according to the height of the liquid level in the internal reaction generator 2; the bottom of the inner reaction generator 2 is connected with an air source 8, and bubbling type continuous air inlet is carried out to ensure that the hydrate is continuously generated; the upper part of the outer reaction generator 1 is connected with a gas source 8 through a first pressure reducing valve 9-1, and redundant gas in the outer reaction generator is sent back to the gas source 8;
the hydrate decomposer 10 is positioned at the lower part of the outer reaction generator 1, is conical to facilitate fresh water collection, and is connected with the outer reaction generator 1 through an opening and closing device 12; the opening and closing device 12 can be controlled to turn over, the filtered hydrate is cleaned in a closed state, the hydrate solid falls into the hydrate decomposer 10 in an open state, and the hydrate decomposer 10 is provided with a water outlet which is connected with the fresh water collector 5 through the first one-way valve 7-1; meanwhile, the hydrate decomposer 10 is connected to the gas source 8 through a second pressure reducing valve 9-2, and gas generated by decomposing hydrate in the hydrate decomposer 10 is sent back to the gas source 8, so that continuous decomposition of the hydrate is guaranteed;
the spraying system is positioned in the reaction generator, wherein the spraying head 11 is positioned below the inner reaction generator 2, the low-temperature seawater in the seawater liquid storage tank 4 sequentially passes through the water suction pump 6 and the second one-way valve 7-2 to be sprayed out from the spraying head 11, and the sprayed water flows back to the seawater liquid storage tank 4 from the water outlet of the opening and closing device 12;
the gas circulation system consists of a gas source 8, a one-way valve and a gas recovery pipeline controlled by a pressure reducing valve, and the gas hydration agent is recycled; the water circulation system consists of a seawater storage tank 4 and a spray water recovery pipeline, and realizes the recovery and retreatment of spray water;
the high-concentration seawater recovery system is characterized in that high-concentration seawater remained at the bottom of the inner reaction generator 2 is sent into a high-concentration seawater recoverer 14 through a fifth one-way valve 7-5, the high-concentration seawater is recovered when air inlet and water inlet are stopped, the seawater is immediately introduced again after the high-concentration seawater is recovered, and the hydrate seawater desalination process is carried out again after the hydrate enters the hydrate decomposer 10.
The invention has the advantages that the characteristics of different densities of the hydrate and the seawater are utilized to separate the hydrate from the solution, the industrialization of the hydrate seawater desalination technology can be realized, the hydrate generation and decomposition device is combined into the same container, and the controllable turnover type opening and closing device is utilized, so that the utilization efficiency of materials is improved, and the problem of pore blockage caused by the generation of the hydrate is effectively avoided. Meanwhile, the spray water can be circulated into the reaction generator, so that the efficiency is improved.
Drawings
FIG. 1 is a schematic diagram of a controllable turnover type opening and closing system of an overflow type continuous hydrate method seawater desalination plant.
In the figure: 1 an external reaction generator; 2 an internal reaction generator; 3, a refrigeration coil; 4, a seawater storage tank;
5, a fresh water collector; 6, a water pump; 7-1 a first one-way valve; 7-2 second one-way valve;
7-3 a third one-way valve; 7-4 fourth check valve; 7-5 a fifth one-way valve; 8, an air source;
9-1 a first pressure relief valve; 9-2 second pressure reducing valves; 10 hydrate decomposer; 11 a shower head;
12 an opening and closing device; 13 a liquid level sensor; 14 high-concentration seawater recoverer.
Detailed Description
The following detailed description of the invention refers to the accompanying drawings.
FIG. 1 is a schematic diagram of an overflow type continuous hydrate seawater desalination plant system, which is connected according to the structure of the plant, and uses carbon dioxide as a hydrating agent to desalinate seawater by a hydrate method, and comprises the following steps:
(1) and (4) checking: introducing seawater into a seawater storage tank 4, fully closing all valves, and ensuring that the seawater raw material and the carbon dioxide gas are sufficient;
(2) water feeding: the water suction pump 6 operates, the third one-way valve 7-3 is opened, seawater flows through the pipeline and enters the inner reaction generator 2, and when the seawater level reaches the position of the liquid level sensor 13, the water suction pump 6 stops rotating and the third one-way valve 7-3 is automatically closed;
(3) refrigerating: the refrigeration coil 3 starts to operate, so that the internal temperature of the internal reaction generator 2 is reduced to the temperature condition required by the generation of the hydrate;
(4) air intake: the fourth one-way valve 7-4 is opened, and carbon dioxide gas is continuously introduced into the internal reaction generator 2 from the gas source 8; simultaneously opening a first pressure reducing valve 9-1 to maintain the pressure in the internal reaction generator 2 at a set value;
(5) reaction: when the temperature and the pressure of the inner reaction generator 2 reach the hydrate generation condition, hydrate crystals are generated in the inner reaction generator 2;
(6) separation: the hydrate crystals generated in the inner reaction generator 2 float to the top of the inner reaction generator 2 due to the fact that the density of the hydrate crystals is smaller than that of the seawater solution, meanwhile, the third one-way valve 7-3 is opened, the water suction pump 6 operates slowly to improve the liquid level in the inner reaction generator 2, the hydrate crystals at the top end flow into the opening and closing device 12 in the outer reaction generator 1, the seawater flows into the seawater storage tank 4 again for circulation after being filtered, and then the third one-way valve 7-3 is closed;
(7) spraying: the second one-way valve 7-2 is opened, the generated hydrate crystals are sprayed and washed by spraying seawater through the spray header 11, the opening and closing device 12 is always in a closed state, and the seawater flows into the seawater storage tank 4 again for circulation after spraying;
(8) draining: during spraying, the fifth one-way valve 7-5 is opened, the remaining high-concentration seawater flows into the high-concentration seawater recoverer 14, the third one-way valve 7-3 is opened after the high-concentration seawater is drained, and when the seawater level reaches the position of the liquid level sensor 13 again, the third one-way valve 7-3 is automatically closed;
(9) isolation: after a certain period, the water suction pump 6 stops running, the second one-way valve 7-2 is automatically closed, and the spraying process is stopped; simultaneously, the opening and closing device 12 is opened, so that the hydrate crystals after being sprayed and washed fall into the hydrate decomposer 10, and then the opening and closing device 12 is closed;
(10) and (3) decomposition: because the hydrate decomposer 10 is insulated from the opening and closing device 12, the hydrate crystals start to decompose due to the high temperature at the hydrate decomposer 10, decomposed gas is collected into the gas source 8 again through the second pressure reducing valve 9-2, and decomposed fresh water flows into the fresh water collector 5 through the first check valve 7-1;
(11) and (3) circulation: and (3) after the hydrate is completely decomposed and the fresh water is collected, completing desalination of a batch of seawater, repeating the steps (2) to (10), and desalinating a next batch of fresh seawater, wherein the water feeding process of the step (2) of the next cycle can be simultaneously started when the step (7) of the seawater desalination process is carried out, and the cycle is carried out.
The overflow type continuous hydrate method seawater desalination apparatus according to the present invention is not limited to the structure and steps described in the above embodiments. The above is only a basic description of the inventive concept, and any equivalent changes or combinations made according to the technical solutions of the present invention should fall within the protection scope of the present invention.
Claims (1)
1. An overflow type continuous hydrate method seawater desalination device is characterized by comprising a reaction generator, a hydrate decomposer (10), a spraying system, a gas circulation system, a water circulation system and a high-concentration seawater recovery system;
the reaction generator comprises an outer reaction generator (1) and an inner reaction generator (2), wherein the inner reaction generator (2) is arranged in the outer reaction generator (1) and both are made of high-pressure-resistant stainless steel; a refrigeration coil (3) is arranged in the inner reaction generator (2) to provide a low-temperature environment required by hydrate generation, the opening position of the inner reaction generator (2) is communicated with the outer reaction generator (1), and a liquid level sensor (13) is arranged on the inner wall; the inner reaction generator (2) is communicated with the seawater storage tank (4) through a water suction pump (6) and a third one-way valve (7-3), and the water inflow is automatically adjusted according to the height of the liquid level in the inner reaction generator (2); the bottom of the inner reaction generator (2) is connected with an air source (8), and air is continuously fed in an bubbling manner, so that continuous generation of hydrates is ensured; the upper part of the outer reaction generator (1) is connected with a gas source (8) through a first pressure reducing valve (9-1), and redundant gas in the outer reaction generator is sent back to the gas source (8);
the hydrate decomposer (10) is positioned at the lower part of the outer reaction generator (1), is conical to facilitate fresh water collection, and is connected with the outer reaction generator (1) through the opening and closing device (12); the opening and closing device (12) can be controlled to turn over, the filtered water hydrate is cleaned in a closed state, the hydrate solid falls into the hydrate decomposer (10) in an open state, and the hydrate decomposer (10) is provided with a water outlet which is connected with the fresh water collector (5) through the first one-way valve (7-1); meanwhile, the hydrate decomposer (10) is connected to the gas source (8) through a second pressure reducing valve (9-2), and gas generated by decomposing hydrate in the hydrate decomposer (10) is sent back to the gas source (8), so that continuous decomposition of the hydrate is ensured;
the spraying system is positioned in the reaction generator, wherein a spraying head (11) is positioned below the inner reaction generator (2), low-temperature seawater in the seawater liquid storage tank (4) is sprayed out from the spraying head (11) through a water suction pump (6) and a second one-way valve (7-2) in sequence, and spraying water flows back to the seawater liquid storage tank (4) from a water outlet of the opening and closing device (12);
the gas circulation system consists of a gas source (8), a one-way valve and a gas recovery pipeline controlled by a pressure reducing valve, and the gas hydration agent is recycled; the water circulation system consists of a seawater storage tank (4) and a spray water recovery pipeline, so that spray water is recovered and reprocessed;
the high-concentration seawater recovery system is characterized in that high-concentration seawater remained at the bottom of the inner reaction generator (2) is sent into a high-concentration seawater recoverer (14) through a fifth one-way valve (7-5), the high-concentration seawater is recovered during the period of stopping air inlet and water inlet, the seawater is introduced again after the high-concentration seawater is recovered, and the hydrate seawater desalination process is carried out again after the hydrate enters the hydrate decomposer (10).
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| CN201611116086.XA CN106745369B (en) | 2016-12-07 | 2016-12-07 | Overflow type continuous hydrate method seawater desalination device |
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| CN201611116086.XA CN106745369B (en) | 2016-12-07 | 2016-12-07 | Overflow type continuous hydrate method seawater desalination device |
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| CN106745369B true CN106745369B (en) | 2020-02-18 |
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| CN109824106B (en) * | 2019-03-18 | 2021-10-15 | 大连理工大学 | Normal-pressure continuous seawater desalination system based on hydrate method and application method thereof |
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| CN100360431C (en) * | 2005-08-02 | 2008-01-09 | 中国石油大学(北京) | Method and apparatus of processing aqueous solution by hydrate method |
| JP4913905B2 (en) * | 2008-07-31 | 2012-04-11 | 株式会社Ｃｄｍコンサルティング | Method and apparatus for producing high-purity water from low-purity water |
| CN101792193B (en) * | 2010-03-19 | 2012-05-02 | 浙江大学 | Device and method for desalting seawater by using cold energy of liquefied natural gas |
| CN103864243B (en) * | 2014-03-13 | 2015-07-22 | 常州大学 | Two-stage sea water desalination method based on hydration and two-stage sea water desalination device based on hydration |
| CN104495964B (en) * | 2015-01-05 | 2016-01-13 | 大连理工大学 | A kind of layer-stepping sea water desalinating plant based on carbon dioxide hydrate method |
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