System for increasing dissolved oxygen in water body

Abstract

The utility model discloses a system for increasing dissolved oxygen in a water body. The system comprises an air separation oxygen generator, a liquid oxygen storage tank, a gas distributor and an aeration device. The air separation oxygen generator is used for preparing liquid oxygen, the liquid oxygen storage tank is used for storing the liquid oxygen, and the aeration device is used for dissolving pure oxygen in a water body through aeration to increase the dissolved oxygen in the water body so as to restore the dissolved oxygen in the anoxic water body to the normal concentration, and is used for increasing the dissolved oxygen in the anoxic river, lake and reservoir water bodies so as to restore the normal dissolved oxygen concentration.

Description

Technical Field

[0001] The utility model discloses a system for increasing dissolved oxygen in water, in particular a system for increasing dissolved oxygen in rivers, lakes and reservoirs by adopting air separation to produce oxygen and dissolving pure oxygen in water through aeration, belonging to the field of environmental protection. Background Art

[0002] Dissolved oxygen (DO) is molecular oxygen dissolved in water. It is an indicator of self-purification capacity and an essential material condition for the survival of aquatic organisms. High DO levels facilitate the degradation of various pollutants in water. Therefore, DO is a key technical indicator of water quality. According to the "Surface Water Environmental Quality Standard" (GB3838-2002), the DO level for Class 1 surface water is greater than or equal to 7.5 mg / L, and for Class 2 surface water, it is greater than or equal to 6 mg / L.

[0003] In recent years, it has been found that due to the construction of reservoirs or hydropower stations, some rivers have deposited silt in the reservoir area. During the high temperature period in summer, the activity of underwater microorganisms has intensified, consuming a large amount of oxygen, resulting in the dissolved oxygen level in the water bodies of rivers downstream of the reservoir area or hydropower station being lower than 6 mg / L, and the water quality of the section being unqualified. Effective measures must be taken to increase the dissolved oxygen in the water body and improve the self-purification capacity of the water bodies of rivers and lakes.

[0004] However, there is currently no equipment at home and abroad that can increase the dissolved oxygen in rivers, lakes and reservoirs. Therefore, there is an urgent need for a device to increase the dissolved oxygen in water. Utility Model Content

[0005] In order to solve the above technical problems, the present application discloses a system for increasing dissolved oxygen in water, the system comprising: an air separation oxygen generator, a liquid oxygen storage tank and an aeration device;

[0006] The air separation oxygen generator adopts an air expansion cycle and uses air as raw material to produce liquid oxygen. The air separation oxygen generator includes: an air compressor, a precooler, a purifier, an expander, a distillation tower and an instrumentation and control system; the distillation tower is divided into an upper distillation tower and a lower distillation tower;

[0007] The liquid oxygen storage tank is used to store the liquid oxygen prepared by the air separation oxygen generator.

[0008] The aeration device is used to supply oxygen to the oxygen-deficient water body through aeration, and the oxygen dissolves in the water body, increasing the concentration of dissolved oxygen in the water body, so that the oxygen-deficient water body returns to a normal dissolved oxygen concentration;

[0009] The air separation oxygen generator, liquid oxygen storage tank and aeration device are connected in sequence.

[0010] Preferably, there is a gas distributor between the liquid oxygen storage tank and the aeration device, and the gas distributor is provided with at least one gas distribution port, and an air supply valve is installed on the gas distribution port to control the oxygen supply amount by switching the air supply valve.

[0011] Preferably, the aeration device consists of an air supply valve, an air supply pipe, and an aeration pipe, and an aerator is installed on the aeration pipe.

[0012] Preferably, the aerator is any one of an oxygen cone aerator, a microporous aerator, an aeration disk, a pump aerator or a jet aerator.

[0013] Preferably, the aerator is an oxygen cone aerator.

[0014] Preferably, the aerator is a microporous aerator.

[0015] Preferably, the aerator is a jet aerator.

[0016] Preferably, the aeration device is further provided with a lifting device, and the lifting device is provided with a lifter and a track device for lifting the aeration device, and is used for lifting the aeration device up and down.

[0017] Preferably, the track device includes a track and a guide chain.

[0018] Preferably, the liquid oxygen storage tank is provided with an oxygen supply valve.

[0019] Preferably, the air separation oxygen concentrator further includes an air filter, and the air filter is connected to the air compressor.

[0020] By adopting the above technical solution, the system for increasing dissolved oxygen in water provided by this application has the following beneficial effects:

[0021] 1. The air separation oxygen generator is used to prepare liquid oxygen, the liquid oxygen storage tank is used to store liquid oxygen, and the aeration device is used to dissolve pure oxygen in the water through aeration to increase the dissolved oxygen in the water, so that the dissolved oxygen in the anoxic water body returns to normal concentration. It is used to increase the dissolved oxygen in the anoxic rivers, lakes, and reservoirs to restore the dissolved oxygen concentration to normal, solving the problem of increasing the dissolved oxygen in rivers, reservoirs and other water bodies;

[0022] 2. Using pure oxygen aeration improves aeration efficiency and ensures aeration effect;

[0023] 3. A liquid oxygen storage tank is installed after the air separation oxygen production equipment. During aeration, the aeration volume can be adjusted by adjusting the opening and closing degree of the valve to ensure the aeration effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the specific implementation and effects of the automated controlled breakpoint chlorination system and process of the present application, the drawings required for the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative work.

[0025] Figure 1 This is a schematic diagram of a system for increasing dissolved oxygen in water according to the present invention;

[0026] Figure 2 This is a schematic diagram of the air separation oxygen production system for increasing dissolved oxygen in water of the utility model;

[0027] Figure 3 This is a schematic diagram of a liquid oxygen storage tank for a system for increasing dissolved oxygen in water according to the present invention;

[0028] Figure 4 This is a schematic diagram of the aeration device of the water body dissolved oxygen improvement system of the utility model;

[0029] Figure 5 This is a schematic diagram of the track lifting device of the aeration device of the water dissolved oxygen improvement system of the utility model.

[0030] Among them, the reference numerals in the figure correspond to:

[0031] 1-air separation oxygen generator, 11-air compressor, 12-precooler, 13-purifier, 14-purifier control cabinet, 15-expander, 16-fractionation tower, 17-liquid pump, 2-liquid oxygen storage tank, 22-gas distributor, 3-aeration device, 31-air supply valve, 32-air supply pipe, 33-aeration pipe, 34-aerator, 4-lifting device, 41-lifter, 42-track, 43-guide chain. DETAILED DESCRIPTION

[0032] The following will be combined with the accompanying drawings in the embodiments of this application to clearly and completely describe the technical solutions in the embodiments of this application. Obviously, the embodiments described are only part of the embodiments of this application, not all of them. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making any creative work are within the scope of protection of this application.

[0033] As used herein, "one embodiment" or "embodiment" refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present application. The following detailed description of preferred embodiments of the present invention and the included embodiments may facilitate understanding of the present invention. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which the present invention pertains. In the event of a conflict, the definitions in this specification shall prevail.

[0034] For the purpose of the following detailed description, it should be understood that the present invention may adopt various alternative changes and step sequences, unless expressly provided otherwise. In addition, except in any operating examples, or when otherwise indicated, all numbers representing the amount of ingredients used in the specification and claims should be understood to be modified by the term "about" in all cases. Therefore, unless otherwise indicated, the numerical parameters set forth in the following specification and the appended claims are approximate values that vary according to the desired performance to be obtained by the present invention. At least it is not intended to limit the application of the doctrine of equivalents to the scope of the claims, and each numerical parameter should at least be interpreted according to the number of reported significant figures and by applying ordinary rounding techniques.

[0035] Notwithstanding that the numerical ranges and parameters setting forth the broad scope of the invention are approximations, the numerical values set forth in the specific examples are reported as precisely as possible. Any numerical value, however, inherently contains certain errors necessarily resulting from the standard deviation found in their respective testing measurements.

[0036] When a numerical range is disclosed herein, the above range is considered to be continuous and includes the minimum and maximum values of the range, as well as every value between such minimum and maximum values. Further, when a range refers to an integer, every integer between the minimum and maximum values of the range is included. In addition, when multiple ranges are provided to describe a feature or characteristic, the ranges can be merged. In other words, unless otherwise indicated, all ranges disclosed herein should be understood to include any and all subranges included therein. For example, a specified range from "1 to 10" should be considered to include any and all subranges between a minimum of 1 and a maximum of 10. Exemplary subranges of the range 1 to 10 include, but are not limited to, 1 to 6.1, 3.5 to 7.8, 5.5 to 10, etc.

[0037] See also Figure 1 A system for increasing dissolved oxygen in water bodies of rivers, lakes and reservoirs comprises: an air separation oxygen generator 1, a liquid oxygen storage tank 2, and an aeration device 3 connected in sequence:

[0038] See also Figure 2The air separation oxygen concentrator 1 adopts an air expansion cycle to produce liquid oxygen using air as a raw material. The air separation oxygen concentrator 1 is composed of an air compressor 11, a precooler 12, a purifier 13, an expander 15, a fractionating tower 15, a liquid pump 17 and an instrumentation and control system 16.

[0039] See also Figure 3 The liquid oxygen storage tank 2 is used to store the liquid oxygen prepared by air separation. Specifically, the liquid oxygen storage tank 2 is provided with an oxygen supply valve.

[0040] See also Figure 4 The aeration device 3 is used to supply oxygen to the oxygen-deficient water body through aeration. The oxygen dissolves in the water body, increasing the dissolved oxygen concentration in the water body, and restoring the dissolved oxygen concentration of the oxygen-deficient water body to normal. Specifically, the aeration device consists of an oxygen supply valve 31, an air supply pipe 32, and an aerator 33 installed underwater.

[0041] In some embodiments, a purifier control cabinet 14 is further installed between the purifier 13 and the expander 15 .

[0042] In some embodiments, an oxygen distributor 21 is further provided between the liquid oxygen storage tank 2 and the aeration device 3. The oxygen distributor is provided with at least one gas distribution port 211. Specifically, there may be two or more gas distribution ports 211. Each gas distribution port is provided with a gas supply valve 31, which controls the oxygen supply by opening and closing the gas supply valve 31.

[0043] In some embodiments, the aeration device comprises an air supply pipe 32 and an aerator 33 installed on the air supply pipe 32 , wherein the aerator 33 is installed at the bottom of the water body that needs reoxygenation.

[0044] In some embodiments, the aerator 34 is one of an oxygen cone aerator, a microporous aerator, an aeration disk, a pump aerator, or a jet aerator.

[0045] In some embodiments, aerator 34 is an oxygen cone aerator.

[0046] In some embodiments, aerator 34 is a microporous aerator.

[0047] In some embodiments, aerator 34 is a jet aerator.

[0048] In some embodiments, the aeration device 3 is further provided with a lifting device 4, and the lifting device 4 is provided with a lifter 41 for lifting the aeration device and a track device for lifting the aeration device up and down.

[0049] Specifically, the system for increasing dissolved oxygen in water of the present application further comprises a lifting device 4, see Figure 5 The track device 4 includes a track 42 and a guide chain 43. The lifting device 4 is vertically installed on the riverbed where the aeration device 3 is installed.

[0050] In some embodiments, the lifting device 4 is composed of a vertical rail 42 , a lifting cable 43 and a winch 41 .

[0051] A system for increasing dissolved oxygen in water, as described above, operates in the following steps:

[0052] S1: Liquid Oxygen Production: Because air contains approximately 21% oxygen, air separation oxygen generator 1 is activated, employing an air expansion cycle. Using air as feedstock, the feed air enters an oil-free air compressor, where it is compressed to 1.0 MPa(G). It then enters a pre-cooling unit, where it is cooled to 10°C. After condensed water is separated in a water separator, the air enters a purifier unit to remove carbon dioxide and residual water, producing purified air. A portion of the purified air enters the main heat exchanger, where it is cooled to the dew point and then enters the lower column of the distillation tower. After distillation in the lower column, nitrogen is obtained at the top of the tower, and oxygen-enriched liquefied air is obtained at the bottom of the tower. The nitrogen at the top of the lower column is condensed into liquid nitrogen in the main condenser evaporator. A portion of the liquid nitrogen serves as reflux for the distillation tower, while a portion is supercooled in a cooler and fed to the upper column of the distillation tower as reflux. The remaining portion of the purified air enters an expander-driven expander, then enters the main heat exchanger. After cooling to a certain temperature, a portion enters the expander for further cooling, providing refrigeration for the plant's cryogenic separation and extraction of liquid products. The oxygen-rich liquefied air at the bottom of the distillation tower is cooled and then enters the upper tower of the distillation tower for further distillation. The oxygen-rich liquefied air is distilled in the upper tower of the distillation tower to obtain liquid oxygen at the bottom of the upper tower.

[0053] S2: Storage of liquid oxygen: The liquid oxygen prepared by the liquid oxygen preparation system is stored in a liquid oxygen storage tank;

[0054] S3: Aeration: Open the liquid oxygen storage tank and transport the liquid oxygen to the aeration device to supply oxygen to the aeration device. The water body is aerated through the aeration device. The oxygen dissolves in the water body to restore the normal dissolved oxygen concentration of the water body. The amount of oxygen supplied is adjusted by the opening and closing degree of the regulating valve to adjust the dissolved oxygen concentration of the water body.

[0055] In some embodiments, S3 opens the oxygen supply valve of the liquid oxygen storage tank to transport liquid oxygen to the liquid oxygen distributor, opens the air supply valve connected to the aeration pipe to supply oxygen to the aerator, aerates the water body through the aerator, and oxygen dissolves in the water body to restore the normal dissolved oxygen concentration of the water body. The amount of oxygen supply is adjusted by the opening and closing degree of the regulating valve to adjust the dissolved oxygen concentration of the water body.

[0056] At standard atmospheric pressure (101.32 kPa), the volume fraction of oxygen in air is 20.95%, and the solubility of oxygen in fresh water is approximately 30 ml / L. According to Henry's law, at constant temperature and salinity, the solubility of a gas in water increases with its partial pressure. For sparingly soluble gases such as nitrogen, oxygen, and hydrogen, when the gas pressure is not very high, the solubility is proportional to its partial pressure. Therefore, the dissolved oxygen saturation values (oxygen in the atmosphere) in water at different temperatures and salinities can be found in Table 1.

[0057] Table 1 Saturation values of atmospheric oxygen and pure oxygen in fresh water (101.32 kPa, mg / L)

[0058]

[0059] As shown in Table 1, at standard atmospheric pressure and a temperature of 25°C, the dissolved oxygen concentration in air aeration can only reach 8.25 mg / L. However, using pure oxygen aeration can reach 39.9 mg / L, 4.8 times that of air aeration. Therefore, to improve aeration efficiency and ensure the dissolved oxygen concentration in rivers and reservoirs, pure oxygen aeration is used.

[0060] During a river flood, the aeration device 3 opens the lifting device 4 to lift the aerator 34 to a safe height to prevent the aerator 34 from being damaged by the flood.

[0061] Example 1:

[0062] The average flow rate is 26m 3 / second river dissolved oxygen enhancement system

[0063] The average flow rate is 26m 3 / second of the river. In order to make full use of water resources, a hydropower station was built. The height of the hydropower station dam is 25 meters. Due to the long-term sedimentation of the reservoir, a certain amount of silt has accumulated in the dam. From June to October every summer, due to the increase in water temperature, the microbial activity in the water and silt intensifies, consuming a large amount of dissolved oxygen, resulting in the dissolved oxygen in the water body as low as 4.2mg / L. In order to increase the dissolved oxygen in the water body to above 6mg / L and ensure that the dissolved oxygen concentration meets the surface water quality standard of Class II in Table 1 of the "Surface Water Environmental Quality Standard" (GB3838-2002), an average flow rate of 26m 3 / second river dissolved oxygen enhancement system

[0064] The dissolved oxygen enhancement system consists of 600Nm 3 / h air separation oxygen concentrator 1, 2 50M 3 It consists of a liquid oxygen storage tank 2 and an oxygen cone aeration device 3.

[0065] 600 Nm3 of liquid oxygen is produced per hour through air separation oxygen generator 13 and store it in 50M 3 The liquid oxygen in the liquid oxygen storage tank 2 is then aerated through the aeration device 3 installed in the river channel below the hydropower station dam, and the dissolved oxygen in the water is increased from 4.2 mg / L to 7.1 mg / L.

[0066] Example 2:

[0067] The average flow rate is 115m 3 / second river dissolved oxygen enhancement system

[0068] The average flow rate is 115m 3 / second of the river. In order to make full use of water resources, a hydropower station was built. The height of the hydropower station dam is 32 meters. Due to the long-term sedimentation of the reservoir, a certain amount of silt has accumulated in the dam. From June to October every summer, due to the increase in water temperature, the microbial activity in the water and silt intensifies, consuming a large amount of dissolved oxygen, resulting in the dissolved oxygen in the water body as low as 3.04mg / L. In order to increase the dissolved oxygen in the water body to above 6mg / L and ensure that the dissolved oxygen concentration meets the surface water quality standard of Class II in Table 1 of the "Surface Water Environmental Quality Standard" (GB3838-2002), the average flow rate is 115m 3 / second of the river's dissolved oxygen enhancement system.

[0069] The dissolved oxygen enhancement system consists of 2500Nm 3 / h air separation oxygen concentrator 1, 6 50M 3 It consists of a liquid oxygen storage tank 2, a jet aeration device 3 and a lifting track 4.

[0070] 2500Nm3 of liquid oxygen is produced per hour through air separation oxygen generator 1 3 and store them in 6 50M 3 The liquid oxygen in the liquid oxygen storage tank 2 is then aerated through the aeration device 3 installed in the river channel below the hydropower station dam, and the dissolved oxygen in the water is increased from 3.04 mg / L to 6.7 mg / L.

[0071] Example 3:

[0072] Dissolved oxygen enhancement system for a river with an average flow of 50m3 / s

[0073] In order to make full use of water resources, a hydropower station was built on a river with an average flow of 50m3 / s. The height of the hydropower station dam is 28 meters. Due to the long-term sedimentation of the reservoir, a certain amount of silt has accumulated in the dam. From June to October each summer, due to the increase in water temperature, the microbial activity in the water and silt intensifies, consuming a large amount of dissolved oxygen, causing the dissolved oxygen in the water to drop to 4.06mg / L. In order to increase the dissolved oxygen in the water to above 6mg / L and ensure that the dissolved oxygen concentration meets the surface water quality standard of Class II in Table 1 of the "Surface Water Environmental Quality Standard" (GB3838-2002), a dissolved oxygen enhancement system is specially implemented for the river with an average flow of 50m3 / s.

[0074] The dissolved oxygen enhancement system consists of 1200Nm 3 / h air separation oxygen concentrator 1, 4 50M 3 It consists of a liquid oxygen storage tank 2, a pump aerator 3 and a lifting track 4.

[0075] 600 Nm3 of liquid oxygen is produced per hour through air separation oxygen generator 1 3 and store it in 50M 3 The liquid oxygen in the liquid oxygen storage tank 2 is then aerated through the aeration device 3 installed in the river channel below the hydropower station dam, and the dissolved oxygen in the water is increased from 4.06 mg / L to 7.0 mg / L.

[0076] Example 4:

[0077] The average flow rate is 50m 3 / second river dissolved oxygen enhancement system

[0078] The average flow rate is 50m 3 / second of the river. In order to make full use of water resources, a hydropower station was built. The height of the hydropower station dam is 28 meters. Due to the long-term sedimentation of the reservoir, a certain amount of silt has accumulated in the dam. From late May to October every summer, due to the increase in water temperature, the microbial activity in the water and silt intensifies, consuming a large amount of dissolved oxygen, resulting in the dissolved oxygen in the water body as low as 3.9mg / L. In order to increase the dissolved oxygen in the water body to above 6mg / L and ensure that the dissolved oxygen concentration meets the surface water quality standard of Class II in Table 1 of the "Surface Water Environmental Quality Standard" (GB3838-2002), an average flow of 50m 3 / second river dissolved oxygen enhancement system

[0079] The dissolved oxygen enhancement system consists of 1200Nm 3 / h air separation oxygen concentrator 1, 4 50M 3 It consists of a liquid oxygen storage tank 2, a jet aeration device 3 and a lifting track 4.

[0080] 1200Nm3 of liquid oxygen is produced per hour through air separation oxygen generator 1 3 and store it in 50M3 The liquid oxygen in the liquid oxygen storage tank 2 is then aerated through the aeration device 3 installed in the river channel below the hydropower station dam, and the dissolved oxygen in the water is increased from 3.9 mg / L to 7.0 mg / L.

[0081] It should be noted that the selection of materials and experimental parameters involved in the above embodiments is only for better obtaining control experimental results to better reflect the beneficial effects of the present application in providing a system for improving dissolved oxygen in water. It is only used as a specific feasible embodiment. The materials and parameters that can be actually implemented in this application are not limited to those in the embodiments, and the specific ranges in the embodiments can be referred to.

[0082] The above description is merely an optional embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present application shall be included in the scope of protection of the present application.

Claims

1. A system for increasing dissolved oxygen in water, characterized in that: The system comprises: an air separation oxygen generator (1), a liquid oxygen storage tank (2) and an aeration device (3); The air separation oxygen generator (1) adopts an air expansion cycle and uses air as a raw material to produce liquid oxygen. The air separation oxygen generator (1) comprises: an air compressor (11), a precooler (12), a purifier (13), an expander (15), a fractionating tower (16) and an instrumentation and control system; the fractionating tower (16) is divided into an upper fractionating tower and a lower fractionating tower; The liquid oxygen storage tank (2) is used to store the liquid oxygen prepared by the air separation oxygen generator; The aeration device (3) is used to supply oxygen to the oxygen-deficient water body through aeration, so that the oxygen dissolves in the water body, increases the concentration of dissolved oxygen in the water body, and restores the dissolved oxygen concentration of the oxygen-deficient water body to normal; The air separation oxygen generator (1), the liquid oxygen storage tank (2), and the aeration device (3) are connected in sequence.

2. A system for increasing dissolved oxygen in water according to claim 1, characterized in that: A gas distributor (22) is also provided between the liquid oxygen storage tank (2) and the aeration device (3).

3. A system for increasing dissolved oxygen in water according to claim 2, characterized in that: At least one gas distribution port is arranged on the gas distributor (22).

4. A system for increasing dissolved oxygen in water according to claim 3, characterized in that: The air distribution port is provided with an air supply valve (31) to control the oxygen supply amount by switching the air supply valve (31).

5. The system for increasing dissolved oxygen in water according to claim 1, wherein: The aeration device (3) comprises an air supply valve (31), an air supply pipe (32), and an aeration pipe (33) which are connected in sequence, and an aerator (34) is installed on the aeration pipe (33).

6. The system for increasing dissolved oxygen in water according to claim 5, characterized in that: The aerator (34) is any one of an oxygen cone aerator, a microporous aerator, an aeration disk, a pump aerator or a jet aerator.

7. The system for increasing dissolved oxygen in water according to claim 1, wherein: The aeration device (3) is further provided with a lifting device (4), and the lifting device (4) is provided with a lifter and a track device for lifting the aeration device, and is used for lifting the aeration device up and down.

8. The system for increasing dissolved oxygen in water according to claim 7, characterized in that: The track device comprises a track (42) and a guide chain (43).

9. The system for increasing dissolved oxygen in water according to claim 1, wherein: The liquid oxygen storage tank (2) is provided with an oxygen supply valve.

10. The system for increasing dissolved oxygen in water according to claim 1, wherein: The air separation oxygen concentrator (1) further comprises an air filter, and the air filter is connected to the air compressor (11).

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