Auxiliary device and method for natural freezing treatment of brackish water

Abstract

The present invention relates to the technical field of brackish water treatment, and in particular to an auxiliary device and method for naturally freezing brackish water, comprising a water pump, a water inlet pipe and a water outlet pipe, the water inlet pipe and the water outlet pipe passing through the ice layer and extending into lake water, a heat exchanger being installed at the front end of the water outlet pipe and a throat being installed at the rear end, the throat pipe being provided with an upper opening and an inverted cylinder being covered above the throat pipe, a rotating scraper being installed below the throat pipe, and the rotating scraper being used to scrape ice on the ice surface into ice powder; the present invention utilizes a water pump to extract water from the lake bottom and exchange heat with the heat exchanger to obtain supercooled water, the rotating scraper scrapes the ice layer to form ice powder, the ice powder is sucked into the throat pipe and merged with the supercooled water and injected under the ice layer, so that the lake water under the ice layer continues to freeze under the induction of the ice powder, thereby realizing separation of highly concentrated brine and ice cubes; the device does not require any structure, can directly utilize the lake itself for desalination treatment, and saves energy, utilizes natural conditions for freezing and melting, and is simple to control, does not require manual control, and saves manpower.

Description

Technical Field

[0001] The present invention relates to the technical field of brackish water treatment, and in particular to an auxiliary device and method for naturally freezing brackish water. Background Art

[0002] my country is one of the countries with the most extensive distribution of saline-alkali land in the world. Currently, Northwest China boasts approximately 550 million mu (approximately 1.5 million hectares) of various types of usable saline-alkali land, of which over 100 million mu (approximately 1.5 million hectares) possess significant agricultural development value and potential for improved utilization. Furthermore, Northwest China is also home to numerous saline-alkali lakes, which, through desalination, can be used to desalinate saline-alkali land.

[0003] Chinese patent application number CN201810346527.8 discloses a brackish water desalination device and a brackish water desalination method. It utilizes natural cold and heat sources and adopts a two-layer water circulation network. The inner layer directly utilizes solar energy to store heat, and the outer layer utilizes secondary heat storage generated by evaporation to generate latent heat of vaporization, thereby realizing heat recovery. At night, the heat accumulated during the day is used to realize continuous brackish water distillation day and night. The application requires the configuration of an inner layer heat storage tank, an outer layer heat storage tank and a solar collector, etc. The infrastructure investment is large. After the treatment of a single saline-alkali lake is completed, the infrastructure needs to be dismantled and continued to be built near the saline-alkali lake to be treated, resulting in high costs. Summary of the Invention

[0004] The technical problem to be solved by the present invention is: in order to overcome the problem that the brackish water treatment device in the prior art requires large infrastructure investment, and after the treatment of a single saline-alkali lake is completed, the infrastructure needs to be dismantled and continued to be built near the saline-alkali lake to be treated, resulting in high costs, an auxiliary device for natural freezing treatment of brackish water is now provided.

[0005] In order to solve the above technical problems, the present invention adopts the following technical solution: an auxiliary device for naturally freezing brackish water, comprising a water pump arranged on the ice surface of a saline-alkali lake, with two holes drilled in the ice surface, the water inlet end of the water pump being connected to an inlet pipe, and the water outlet end being connected to an outlet pipe, the inlet pipe and the outlet pipe being both erected on the ice surface, and both respectively pass through the ice layer through the two holes and extend into the lake water, the water inlet of the inlet pipe extends into the bottom of the lake, the end of the outlet pipe is bent to form a horizontal section, a plurality of outlets are provided on the horizontal section, and there is a certain distance between the water inlet and the water outlet.

[0006] A heat exchanger is installed at the front end of the outlet pipe along the flow direction of the lake water. The temperature in the northwest region is relatively low and cold. The heat exchanger will exchange heat between the higher temperature water drawn from the bottom of the lake and the external air to form supercooled water. A throat is installed at the rear end. The throat has an upper opening and an inverted cylinder is provided above the throat. There is a gap between the cylinder and the ice layer. An electric rotating scraper is installed under the throat. The rotating scraper scrapes the ice on the ice surface into ice powder. The rotating scraper will generate airflow when it rotates, and the lake water is pumped in After entering and exiting the water pipe, it has a certain speed. When passing through the throat, the pressure difference between the inside and outside of the throat will produce an air suction effect. The air flow flows into the throat from the lower port of the inverted cylinder. The ice formed by the rotating scraper scraping the ice layer is in powder form and has a very small weight. The ice powder is sucked into the throat under the combined action of the rotating scraper and the air flow generated by the throat. The supercooled water and the ice powder after heat exchange are injected into the lake water below the ice layer. The ice powder becomes a crystallization nucleus, causing the lake water below the ice layer to continue to freeze under the induction of the ice powder until the external temperature rises and it can no longer freeze.

[0007] The above technical solution uses a water pump to pump water from the bottom of the lake and exchange heat with a heat exchanger to obtain supercooled water. A rotating scraper scrapes the ice layer to form ice powder, which is sucked into the throat and merged with the supercooled water and injected under the ice layer. The lake water under the ice layer continues to freeze under the induction of the ice powder, thereby achieving the separation of highly concentrated brine and ice cubes. This device does not require any structures and can directly use the lake itself for desalination treatment, saving energy and utilizing natural conditions for freezing and melting. In addition, the control is simple, no manual control is required, and manpower is saved.

[0008] Furthermore, both ends of the throat are connected with a corrugated hose, which has a certain elasticity. The wind in the northwest region is relatively strong, and the water passing through the water pump has a certain speed. Therefore, the corrugated hose can be swung under the action of internal hydraulic force and external wind force to drive the rotating scraper to move on the ice surface, thereby expanding the scraping range of the rotating scraper. It can provide sufficient condensation nuclei for the water under the ice layer to induce its freezing, and can prevent the rotating scraper from continuously scraping the ice surface in a fixed position, destroying the supporting capacity of the ice layer.

[0009] Furthermore, a roller is installed at the bottom of the cylinder, which contacts the ice layer to provide support for the cylinder. When the corrugated hose drives the cylinder to move under the action of water and wind, the roller can make the cylinder move more smoothly and scrape a larger ice area.

[0010] Furthermore, the cylinder is provided with a counterweight. Since the wind is strong in the northwest region, counterweights of different weights can be configured according to the wind strength to apply different pressures to the cylinder, so that the rotating scraper can be close to the ice surface to perform the scraping work.

[0011] Furthermore, an elastic member is installed between the cylinder and the roller, which can buffer the force applied by the counterweight to the roller to ensure smooth movement of the roller.

[0012] Furthermore, a bell mouth is installed on the upper opening of the throat pipe, and the bell mouth has a guiding function, which is conducive to the ice powder entering the throat pipe.

[0013] A method for operating an auxiliary device for naturally freezing brackish water, comprising:

[0014] S1. After the lake freezes, place the device on the ice surface and insert both the inlet and outlet pipes into the ice layer and extend them into the lake water.

[0015] S2. Start the water pump and the rotating scraper. The water from the lake bottom is pumped out and cooled by the heat exchanger. The rotating scraper scrapes the ice on the surface into ice powder. The corrugated hose is swung by the internal hydraulic force and the external wind force, driving the rotating scraper to move and expand the scraping area. The ice powder is sucked into the throat through the bell mouth by the airflow generated by the rotating scraper and the throat. The supercooled water and ice powder after heat exchange are injected into the lake water, and the lake water continues to freeze under the guidance of the ice powder.

[0016] S3. When the seasons change and the temperature gradually rises, lay a black plastic sheet with a cofferdam on the surface of the ice layer, remove the connection between the corrugated hose and the outlet pipe, and spray the water in the outlet pipe on the surface of the plastic sheet. Solid salt is obtained through natural evaporation, and the ice layer dissolves in spring and summer to obtain fresh water.

[0017] The beneficial effects of the present invention are as follows: the present invention utilizes a water pump to extract water from the lake bottom and exchange heat with a heat exchanger to obtain supercooled water; a rotating scraper scrapes the ice layer to form ice powder; the ice powder is sucked into the throat pipe and merged with the supercooled water and injected under the ice layer, so that the lake water under the ice layer continues to freeze under the induction of the ice powder, thereby achieving separation of highly concentrated brine and ice cubes; the device does not require any structures, can directly utilize the lake itself for desalination treatment, and saves energy, utilizes natural conditions for freezing and melting, and is simple to control, does not require manual control, and saves manpower. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The present invention will be further described below with reference to the accompanying drawings and examples.

[0019] Figure 1 It is a structural schematic diagram of the present invention;

[0020] Figure 2 It is a structural diagram of the cylinder;

[0021] In the picture:

[0022] 1. Water pump; 2. Water inlet pipe; 3. Water outlet pipe; 301. Water outlet; 4. Heat exchanger; 5. Throat; 501. Upper opening; 6. Cylinder; 7. Rotating scraper; 8. Corrugated hose; 9. Roller; 10. Counterweight; 11. Elastic part; 12. Bell mouth. DETAILED DESCRIPTION

[0023] The present invention will now be described in further detail with reference to the accompanying drawings. These drawings are simplified schematic diagrams, illustrating the basic structure of the present invention only in a schematic manner. Therefore, they only show components relevant to the present invention, and directions and references such as up, down, left, right, etc., are merely used to facilitate the description of features in the drawings. The following detailed description is therefore not to be taken in a limiting sense, and the scope of the claimed subject matter is defined solely by the appended claims and their equivalents.

[0024] Example 1:

[0025] like Figure 1 and Figure 2 As shown, the present invention is an auxiliary device for naturally freezing brackish water, comprising a water pump 1 arranged on the ice surface of a saline-alkali lake, with two holes drilled in the ice surface. The water inlet end of the water pump 1 is connected to an inlet pipe 2, and the water outlet end is connected to an outlet pipe 3. The inlet pipe 2 and the outlet pipe 3 are both erected on the ice surface, and both pass through the ice layer through two holes and extend into the lake water. The water inlet of the inlet pipe 2 extends into the bottom of the lake, and the end of the outlet pipe 3 is bent to form a horizontal section, with multiple outlets 301 opened on the horizontal section, and there is a certain distance between the water inlet and the outlet 301.

[0026] A heat exchanger 4 is installed at the front end of the outlet pipe 3, along the direction of lake water flow. This heat exchanger 4 can be, but is not limited to, a fin-tube heat exchanger for air-cooled heat exchange. Temperatures in the northwest region are relatively low and cold. Heat exchanger 4 exchanges heat between the warmer water pumped from the lake bottom and the outside air, creating supercooled water. The water pump 1 keeps the water flowing inside the inlet pipe 2 and outlet pipe 3. Due to the lack of condensation nuclei, the water in these pipes does not freeze. A throat pipe 5 is installed at the rear end of the water outlet pipe 3. The throat pipe 5 is provided with an upper opening 501, and a bell mouth 12 is installed on the upper opening 501. An inverted cylinder 6 is provided above the throat pipe 5, and a gap is left between the cylinder 6 and the ice layer. An electric rotating scraper 7 is installed below the throat pipe 5. The rotating scraper 7 scrapes the ice on the ice surface into ice powder. The bottom end of the cylinder 6 is at the same height as the rotating scraper 7 to prevent the gap between the bottom end of the cylinder 6 and the ice layer from being too large, causing part of the ice powder to fly out of the cylinder 6. In order to further reduce the ice powder flying out of the cylinder 6 and make the ice powder move upward as much as possible, the rotating scraper 7 can be set at an angle. When it rotates, it can shovel the ice powder upward, providing initial power for the upward movement of the ice powder. The rotating scraper 7 generates airflow when rotating, and the lake water has a certain speed after entering the water outlet pipe 3 through the pump. When passing through the throat pipe 5, the pressure difference between the inside and outside of the throat pipe 5 will produce an air suction effect, and the airflow flows into the throat pipe 5 from the lower port of the inverted cylinder 6. The ice formed by the rotating scraper 7 scraping the ice layer is in powder form and has a very small weight. The ice powder is sucked into the throat pipe 5 from the bell mouth 12 under the combined action of the airflow generated by the rotating scraper 7 and the throat pipe 5. The bell mouth 12 has a guiding function. The supercooled water and ice powder that have undergone heat exchange are injected under the ice layer. The ice powder becomes a crystallization nucleus, causing the lake water under the ice layer to continue to freeze under the induction of the ice powder until the external temperature rises and it can no longer freeze.

[0027] The two ends of the throat pipe 5 are connected with a corrugated hose 8, which has a certain degree of elasticity. The wind in the northwest region is relatively strong, and the water passing through the water pump 1 has a certain speed. Therefore, the corrugated hose 8 can be swung under the action of internal hydraulic force and external wind force to drive the rotating scraper 7 to move on the ice surface, thereby expanding the scraping range of the rotating scraper 7, providing sufficient condensation nuclei for the water under the ice layer to induce its freezing, and preventing the rotating scraper 7 from continuously scraping the ice surface at a fixed position and destroying the supporting capacity of the ice layer.

[0028] A roller 9 is installed at the bottom of the cylinder 6. The roller 9 contacts the ice layer to provide support for the cylinder 6. When the corrugated hose 8 drives the cylinder 6 to move under the action of water and wind, the roller 9 can make the cylinder 6 move more smoothly and the ice scraping area is larger; and a counterweight block 10 is arranged on the cylinder 6. Because the wind in the northwest region is strong, counterweight blocks 10 of different weights can be configured according to the wind force to apply different pressures to the cylinder 6, so that the rotating scraper 7 is close to the ice surface to scrape the ice; an elastic member 11 is installed between the cylinder 6 and the roller 9, which can buffer the force applied by the counterweight block 10 to the roller 9 to ensure smooth movement of the roller 9.

[0029] Example 2:

[0030] A method for operating an auxiliary device for naturally freezing brackish water, comprising:

[0031] S1. After the lake freezes, place the device on the ice surface, drill two holes in the ice surface, and insert the water inlet pipe 2 and the water outlet pipe 3 through the two holes into the ice layer and into the lake water;

[0032] S2. Start the water pump 1 and the rotating scraper 7. The water at the bottom of the lake is pumped out by the water pump 1 and cooled by the heat exchanger 4. The rotating scraper 7 scrapes the ice on the surface into ice powder. The corrugated hose 8 is swung by the internal hydraulic force and the external wind force, driving the rotating scraper 7 to move and expand the scraping area. The ice powder is sucked into the throat 5 through the bell mouth 12 under the action of the airflow generated by the rotating scraper 7 and the throat 5. The supercooled water and ice powder after heat exchange are injected into the lake water, and the lake water continues to freeze under the guidance of the ice powder.

[0033] S3. When the season changes and the temperature gradually rises, a black plastic sheet with a cofferdam is laid on the surface of the ice layer, and the connection between the corrugated hose 8 and the water outlet pipe 3 is released. The water in the water outlet pipe 3 is sprayed on the surface of the plastic sheet. After evaporation under the sun, the concentrated brine is evaporated to obtain solid salt. The ice layer dissolves in spring and summer to obtain fresh water.

[0034] The above description of the preferred embodiments of the present invention is intended to serve as a guide. Based on the above description, relevant personnel are fully capable of making various changes and modifications without departing from the technical scope of this invention. The technical scope of this invention is not limited to the contents of the specification and must be determined according to the scope of the claims.

Claims

1. An auxiliary device for naturally freezing brackish water, characterized by: The invention comprises a water pump (1) arranged on the ice surface of a saline-alkali lake, wherein the water inlet end of the water pump (1) is connected to a water inlet pipe (2), and the water outlet end is connected to a water outlet pipe (3), both of the water inlet pipe (2) and the water outlet pipe (3) pass through the ice layer and extend into the lake water, and the front end of the water outlet pipe (3) along the flow direction of the lake water is installed with a heat exchanger (4), and the rear end is installed with a throat pipe (5), the throat pipe (5) is provided with an upper opening (501), and the throat pipe (5) is covered with an inverted cylinder (6), and a rotating scraper (7) is installed below the throat pipe (5), and the rotating scraper (7) is used to scrape the ice on the ice surface into ice powder, and the ice powder enters the throat pipe (5) under the action of the airflow generated by the rotating scraper (7) and the throat pipe (5), merges with the supercooled water formed by heat exchange in the heat exchanger (4), and enters below the ice layer, so that the lake water below the ice layer continues to freeze under the induction of the ice powder; Both ends of the throat pipe (5) are connected with corrugated hoses (8); A roller (9) is installed at the bottom of the cylinder (6); A counterweight (10) is arranged on the cylinder (6).

2. The auxiliary device for naturally freezing brackish water according to claim 1, characterized in that: An elastic member (11) is installed between the cylinder (6) and the roller (9).

3. The auxiliary device for naturally freezing brackish water according to claim 1, characterized in that: A bell mouth (12) is installed on the upper opening (501) of the throat pipe (5).

4. The method of the auxiliary device for naturally freezing brackish water according to any one of claims 1 to 3, characterized in that: S1. After the lake water freezes, place the device on the ice surface, and insert the water inlet pipe (2) and the water outlet pipe (3) into the ice layer and extend them into the lake water; S2. Start the water pump (1) and the rotating scraper (7). The water at the bottom of the lake is pumped out by the water pump (1) and cooled by the heat exchanger (4). The rotating scraper (7) scrapes the ice on the ice surface into ice powder. The corrugated hose (8) swings under the action of internal hydraulic force and external wind force, driving the rotating scraper (7) to move to expand the scraping area. The ice powder is sucked into the throat (5) from the bell mouth (12) under the action of the airflow generated by the rotating scraper (7) and the throat (5). The supercooled water and ice powder after heat exchange are injected into the lake water below the ice layer. The lake water continues to freeze under the guidance of the ice powder. S3. When the season changes and the temperature gradually rises, a black plastic sheet with a cofferdam is laid on the surface of the ice layer, the connection between the corrugated hose (8) and the outlet pipe (3) is released, and the water in the outlet pipe (3) is sprayed on the surface of the plastic sheet. Solid salt is obtained through natural evaporation, and the ice layer dissolves in spring and summer to obtain fresh water.

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