CN217025517U

CN217025517U - Oxygen gas lift type oxygenation system

Info

Publication number: CN217025517U
Application number: CN202123277097.5U
Authority: CN
Inventors: 关曜忠; 关广联
Original assignee: Individual
Current assignee: Individual
Priority date: 2021-12-23
Filing date: 2021-12-23
Publication date: 2022-07-22
Anticipated expiration: 2031-12-23

Abstract

The utility model discloses an oxygen gas lift type oxygenation system, which comprises an air pump for circulating oxygen, a gas pipe for conveying oxygen, an air source for providing the oxygen, an aeration head, an aeration water pushing pipeline and a gas storage chamber, wherein the aeration head is connected with the gas storage chamber; the aeration water pushing pipeline comprises an air inlet pipe section, a gas collecting pipe section and a water outlet pipe section, the air inlet pipe section and the water outlet pipe section are both positioned below the water surface, and the aeration head is arranged in the air inlet pipe section; the air storage chamber is at least partially positioned above the water surface, is connected with an oxygen source for providing oxygen and is connected with the air collecting pipe section and/or the water outlet pipe section. The oxygen gas lift type oxygenation system adopts oxygen aeration, and oxygen can be recycled, so that the utilization rate of the oxygen is greatly improved.

Description

Oxygen gas lift type oxygenation system

Technical Field

The utility model relates to an oxygen increasing system for an aquaculture water body, in particular to an oxygen gas lift type oxygen increasing system for the aquaculture water body.

Background

Dissolved oxygen is an important parameter of water treatment systems for aquaculture, sewage treatment and the like. The higher dissolved oxygen can effectively eliminate harmful substances such as ammonia nitrogen, nitrite, hydrogen sulfide and the like, thereby improving the water quality, increasing the feed conversion rate and the like.

With the improvement of the culture technology and the improvement of the culture density, the traditional air oxygenation mode can not meet the oxygenation requirement more and more. For example, the dissolved oxygen is difficult to increase as the dissolved oxygen is closer to saturation, and the saturated dissolved oxygen of the water temperature of 30 ℃ is only 7.56mg/t, so that the dissolved oxygen of the water body is difficult to keep above 5mg/t for a long time only by air oxygenation, and the day-night difference is large. Once the fish and the shrimps are exposed to continuous rainy days, the fish and the shrimps are extremely likely to die due to severe oxygen deficiency.

Oxygen aeration has the advantages of rapidness, high efficiency, capability of reaching dissolved oxygen (for example, super saturation) which cannot be reached by air aeration and the like, and the only defect is that the oxygen cost is high, so the utilization rate of oxygen is the key of oxygen aeration. At present, the methods for oxygen aeration in the prior art mainly include three methods:

(1) the aeration head is used for aeration, and the mode needs to adopt tiny micropore aeration to increase the utilization rate of oxygen. It is generally desirable to use pressures above 100kpa (one atmosphere). Even so, the utilization rate of oxygen still hardly exceeds 30%;

(2) jetting: the method utilizes the Venturi principle: the negative pressure generated by the high-flow-rate water flow sucks oxygen into the pipeline, and simultaneously, the oxygen is stirred violently and sheared into fine bubbles. The technical characteristics are that bubbles generated at a higher flow rate are smaller, the oxygen utilization rate is higher, and the energy consumption is improved at the same time;

(3) a micro-exposure machine: because the cost and the energy consumption are too high, the method is adopted by less people.

However, the above methods do not completely solve the problem of low oxygen utilization rate caused by the release of the broken oxygen bubbles into the atmosphere.

Therefore, there is a need for an oxygen aeration system that can recover unused oxygen.

Disclosure of Invention

The utility model aims to provide an oxygen gas lift type oxygenation system which can improve oxygen utilization rate and is used in aquaculture water bodies.

In order to achieve the aim of the utility model, the utility model discloses an oxygen gas lift type oxygenation system for aquaculture water, which comprises an air pump for circulating oxygen, a gas pipe for conveying oxygen, an oxygen gas source for providing oxygen, at least one aeration head for forcibly transferring gaseous oxygen in the oxygen to liquid water in the water and at least one aeration water pushing pipe supported by a floater, wherein the air pump is used for conveying oxygen; the gas pipe transmits oxygen to the aeration water pushing pipe through the aeration head;

wherein, the oxygen gas lift type oxygenation system further comprises at least one gas storage chamber;

the adopted aeration water pushing pipeline further comprises an air inlet pipe section, a gas collecting pipe section and a water outlet pipe section; the air inlet pipe section and the water outlet pipe section are both positioned below the water surface, and the air collecting pipe section is connected with the air inlet pipe section and the water outlet pipe section and positioned at the upper parts of the air inlet pipe section and the water outlet pipe section, namely, the air inlet pipe section and the water outlet pipe section are closer to the water surface or partially exceed the water surface;

the adopted aeration head is arranged in the air inlet water inlet pipe section, and oxygen pumped by the air pump is aerated in the air inlet water inlet pipe section;

at least one air storage chamber is at least partially positioned above the water surface, is connected with an oxygen source for providing oxygen and is connected with the air collecting pipe section and/or the water outlet pipe section.

In the oxygen gas lift type oxygen increasing system, the aeration of the oxygen is carried out in a closed environment. In such a closed environment, oxygen bubbles are concentrated towards the gas collecting pipe section and collected at the top of the gas collecting pipe section under the action of buoyancy, and enter the gas storage chamber, and are used for further aeration together with fresh oxygen from the oxygen source, namely: and is pumped back to the aeration water pushing pipeline by the air pump. Therefore, most of the unabsorbed oxygen in the air inlet water inlet pipe section is recycled, and the utilization rate of the oxygen is greatly improved. A small amount of oxygen bubbles can flow through the water outlet pipe section and enter the water body through the water outlet under the action of thrust. Since the water outlet is usually located at the lower part, even the bottom, of the water body, these small amount of oxygen bubbles stay in the water body for a long time under the action of water pressure, and a part of the oxygen bubbles is absorbed by the water body.

In a preferred embodiment of the oxygen gas lift type aeration system of the present invention, a part of the gas collecting pipe section is located below the water surface, and a part of the gas collecting pipe section is located above the water surface. More preferably, an oxygen recovery pipe is arranged between the gas collecting pipe section and the air storage chamber, so that oxygen collected by the gas collecting pipe section is conveyed into the air storage chamber, and the utilization rate of the oxygen is improved.

In the oxygen gas lift type oxygen increasing system of the utility model, the gas collecting pipe section can also be completely arranged below the water surface. If the manifold section is completely below the water surface and connected to the above-mentioned air reservoir, then oxygen bubbles enter directly into the air reservoir, releasing oxygen, which is used for further aeration together with fresh oxygen from the oxygen supply. In this way, the gas collecting pipe section can be part of the gas storage chamber.

In order to further improve the utilization rate of oxygen, an oxygen recovery pipe communicated with the air storage chamber can be additionally arranged at the water outlet pipe section, particularly at the position close to the water outlet, so that oxygen bubbles moving to the position float up to the air storage chamber to release oxygen, and the utilization rate of the oxygen is further increased. Of course, the water outlet pipe section can be directly connected with the air storage chamber, and the air collecting pipe section is not provided with an oxygen recovery pipe connected with the air storage chamber. This is suitable for the case of large thrust, i.e. large air output of the air pump.

Typically, the below-water gas header section occupies a larger portion or volume than the above-water gas header section.

In the preferred oxygen gas lift type aeration system, the oxygen bubbles generated by the aeration head drive the water to move upwards and simultaneously dissolve the oxygen into the water. The water flow flows to the top gas collecting pipe section of the aeration water pushing pipeline and turns to flow in the horizontal direction, and oxygen bubbles float upwards and are broken to release oxygen. The released oxygen flows back to the air storage chamber through a recovery pipe connected with the air storage chamber at the air collecting pipe section and is injected into the aeration head by the air pump again. The water flow flows back to the pond downwards (or obliquely downwards) after aeration and oxygenation, and continuously flows along the bottom of the pond, so that the aerated high-dissolved-oxygen water and the original water at the bottom of the pond are fully mixed and scour the bottom of the pond, and the dissolved oxygen of the lower layer of the water body is improved to provide targeted oxygen supply for probiotics at the bottom of the pond.

In a preferred embodiment, in the oxygen gas lift oxygenation system of the utility model,

the cross section area of the horizontal direction (gas collecting pipe section) of the aeration water pushing pipeline is larger than that of the two parts, namely the upward part (gas inlet pipe section) and the downward part (water outlet pipe section), so that oxygen bubbles can be conveniently broken and released.

In the oxygen gas lift type oxygen increasing system, the gas collecting pipe section in the aeration water pushing pipeline is usually arranged close to the direction parallel to the water surface, wherein the gas collecting pipe section can only occupy a small part of the whole aeration water pushing pipeline. In the aeration push water pipeline, the inclination angle of the air inlet water inlet pipe section is generally larger than that of the water outlet pipe section, namely, the air inlet water inlet pipe section is closer to the vertical to the water surface, so as to be more beneficial to the oxygen absorption of the water body.

The oxygen gas lift type oxygenation system recovers oxygen gathered at the top of the pipeline through the recovery pipe and supplies the oxygen to the air pump again to achieve the purpose of recycling, and the oxygen utilization rate can be close to 100% theoretically. The whole system is in an open state only in the aeration stage, namely between the aeration head and the oxygen recovery pipe, and oxygen is sealed at the top of the aeration water pushing pipe by water, so that the utilization rate of the oxygen can be close to 100 percent theoretically (in the case that the oxygen supply speed is slow).

Preferably, in the oxygen gas lift oxygenation system of the utility model, the volume of at least one air reservoir is variable, for example the air reservoir or a part thereof is an air bag. Under the condition that the volume of the air storage chamber is variable or elastically variable, the pressure of the air storage chamber should be kept at normal pressure as far as possible, so that the pressure fluctuates only a little; because the pressure fluctuation is too large, adverse effects are brought: when the air storage chamber has larger positive pressure, the air pressure can increase the resistance of the upstream water flow and reduce the flow; when the air storage chamber is under a large negative pressure, water flow in the horizontal direction is caused to block the pipeline, so that the oxygen recovery pipe is blocked, and the oxygen recovery efficiency is influenced.

In the oxygen gas lift aeration system of the present invention, at least a portion of at least one air reservoir may be made of a non-elastic material or an elastic material. By using air reservoirs with variable volume, for example at least one air reservoir being a normal air bag or a rubber air bag, it is possible to achieve an adjustment of the air pressure thereof by means of the volume change of the air reservoir. When the air storage quantity is increased, the air bag is blown to be large, and when the air storage quantity is reduced, the air bag is drawn out from the air bag, so that obvious air pressure change cannot be generated.

In the oxygen gas lift type oxygenation system, if a variable-volume air storage chamber is not adopted, the system can be ensured to normally operate in the following auxiliary adjusting mode:

a. the height of the aeration water pushing pipeline in the horizontal direction is increased, but the defect that the aeration stroke is shortened for aeration heads with the same depth is overcome;

b. a flow sensor is arranged at the outlet of the aeration water pushing pipeline, when the flow is too small, the air pressure is too high, and the air supply is stopped for a period of time or the air supply amount is reduced;

c. a water level sensor is arranged at the initial stage of the downward movement (water outlet pipe section) of the aeration water pushing pipeline, if the water level is too low, the air pressure is high, and the air supply is stopped for a period of time or the air supply amount is reduced;

d. a water level sensor is arranged in the oxygen recovery pipe, and if the water level is too high, the air pressure is too small, and the air supply quantity is increased;

e. an air pressure sensor is arranged in the air storage chamber, and the air supply quantity is adjusted by arranging an upper limit and a lower limit;

f. and air compensating valves are arranged at the air storage chamber or the inlet and the outlet of the air storage chamber, and are opened to restore the normal pressure when the air pressure exceeds the regulation limit. The air compensation valve may also be replaced with an air compensation port.

The above methods have the problems of too small adjustment range and too frequent adjustment, but can be used as auxiliary methods of the utility model.

In the oxygen gas lift type oxygen increasing system, the adopted variable volume air storage chamber can also be made of light and thin non-elastic materials, and pressure change hardly exists in the upper limit and the lower limit of the volume. In addition, the frequency at which the aforementioned additional adjustment is required is very low. For example, a cubic air storage chamber with the side length of 1 meter is used, and the volume is variable, namely 800 liters; the oxygen consumption is 20 liters per minute, the air supply error is 5 percent, namely more than 1 liter of oxygen is supplied per minute, and the adjustment limit of the air storage chamber is exceeded in 800 minutes. 20 liters of oxygen per minute is 41 kilograms in day and night, and if the oxygen is completely dissolved in water, the dissolved oxygen of a water body with the water surface of 10 mu and the water depth of 2 meters can be improved by 3 milligrams per liter.

In addition, in addition to the auxiliary adjustment mode, the limit switch can be adopted for adjustment in the oxygen gas lift type oxygenation system, and the adjustment can be carried out when the air pressure is not changed.

In the oxygen gas lift type oxygenation system, the gas pipe for conveying oxygen can be further provided with a return pipe and a flow regulating valve positioned in the return pipe. The return pipe and the flow regulating valve are arranged, so that when the air supply quantity of the air pump is far larger than the consumption quantity of the aeration head, partial compressed oxygen can flow back by opening the flow regulating valve, and the air pump is prevented from being damaged due to overlarge pressure of the air pump.

In the oxygen gas lift type oxygen increasing system of the utility model, the air storage chamber may be further provided with an air compensation valve. This air compensation valve has at least three functions: (1) when the air storage quantity in the air storage chamber exceeds the upper limit and the lower limit, the air compensation valve is opened to ensure smooth circulation; (2) when the water body does not need oxygenation and only needs stirring, the air compensation valve can be opened, and the oxygen supply can be reduced or stopped, so that the oxygen can be saved; (3) when ammonia nitrogen in the water body volatilizes in the aeration process and flows into the air storage chamber more, the air compensation valve can be opened to ventilate the air storage chamber.

In the oxygen gas lift type oxygen increasing system, the water inlet of the aeration water pushing pipeline can be arranged at the lower part of the water body or at the upper part of the water body. The water inlet is arranged on the upper part of the water body, so that the upper layer water can be taken to push water, and the water-pushing device has the advantages that: (1) the green algae in the upper layer water is used for making oxygen and is conveyed to the bottom of the pond, so that a large amount of oxygen can be saved; (2) the upper and lower water convects, stirring more effectively, but it also has disadvantages: (1) water with lower dissolved oxygen is not taken, so that the oxygenation efficiency is lowered; (2) the water temperature at the bottom layer is easy to change suddenly, so that the fish and the shrimp are stressed.

Preferably, in the oxygen gas lift type aeration system of the utility model, the water outlet of the aeration push water pipeline is arranged at the lower part of the water body, even at the bottom of the water body, such as near the bottom of a pond.

Preferably, in the oxygen gas lift type oxygenation system of the utility model, a boosting water pump can be further arranged, and the boosting water pump can be arranged in an ascending stage (namely an air inlet water inlet pipe section) of an aeration water pushing pipeline to lift the lift and can also be arranged in a descending stage (an water outlet pipe section) to assist the release of oxygen bubbles, but the cost and the energy consumption are increased.

Preferably, in the oxygen gas lift type oxygenation system, the air pump adopts the pressure of about 30-40Kpa as much as possible, the air pump wastes electricity, the air pump cannot pressurize oxygen to deep water if the air pump is too low, and even if the air pump can not pressurize oxygen, the aeration quantity is reduced, and the air pump is preferably adjusted by a frequency converter.

In the oxygen gas lift type oxygen increasing system, the aeration head can block part of the passing area, so the cross section area of the aeration water pushing pipeline at the position where the aeration head is arranged is enlarged to ensure the passing area of water flow.

Compared with the prior art, the oxygen gas lift type oxygenation system has the advantages that: 1. Oxygen aeration is adopted, and the oxygen aeration efficiency is far higher than that of common aeration; 2. because the oxygen can be recycled, the oxygen is not needed to be aerated by using too small aeration holes, the aeration pressure is reduced, and the energy consumption is reduced. Meanwhile, the aeration holes are not easy to block; 3. the water is lifted by adopting a gas lift method, the lift is extremely low, the principle of low lift and large flow is fully embodied, and the energy consumption is further reduced; 4. The water surface is not stirred vigorously, so that the oxygen volatilization in the supersaturated dissolved oxygen upper-layer water generated by oxygen production by algae in the water body is reduced; 5. can make the dissolved oxygen reach higher height, and is greatly helpful for the growth of fish and shrimp and the growth and propagation of probiotics in water. Researches show that fishes and shrimps eat more, draw less and grow fast in a high dissolved oxygen environment; 6. can carry out first aid on the severely anoxic water body and quickly recover the dissolved oxygen amount; 7. when the industrial culture is used for feeding, the dissolved oxygen is increased to a super-saturated state in advance so as to counteract the sudden drop of the dissolved oxygen after the feeding.

The present invention will be further described with reference to the accompanying drawings and specific embodiments, which are illustrative of certain specific embodiments of the present invention and are not to be construed as limiting the utility model. Any changes or modifications on the basis of the present invention are within the protection scope of the present invention.

Drawings

FIG. 1 is a schematic view of a first embodiment of an oxygen gas lift oxygenation system of the present invention;

FIG. 2 is a schematic view of a second embodiment of the oxygen gas lift oxygenation system of the present invention;

FIG. 3 is a schematic view of a third embodiment of the oxygen gas lift oxygenation system of the present invention;

FIG. 4 is a schematic view of a fourth embodiment of the oxygen gas lift oxygenation system of the present invention;

in the figures, the various reference numbers are:

1 air pump

2 gas pipe

3 oxygen source

4 aeration head

5 aeration water pushing pipeline

51 air inlet water inlet pipe section

52 gas collecting pipe section

53 go out water pipe section

54 water inlet

55 water outlet

6 air storage chamber

7 oxygen recovery tube

8 return pipe

9 flow control valve

10 air compensation valve

11 boost the water pump.

Detailed Description

Example 1

As shown in fig. 1, it is an embodiment of the oxygen air lift type aeration system for aquaculture water of the present invention, the system includes an air pump 1 for circulating oxygen, an air pipe 2 for delivering oxygen, an oxygen air source 3 for providing oxygen, at least one aeration head 4 for forcibly transferring gaseous oxygen in oxygen to liquid water in water, at least one aeration push water pipe 5 supported by a float, and at least one air storage chamber 6; wherein, the gas pipe 2 transmits oxygen to the aeration water pushing pipe 5 through the aeration head 4.

The aeration push water pipeline 5 further comprises an upward air inlet water inlet pipeline section 51, a gas collecting pipeline section 52 parallel to the water surface and a downward water outlet pipeline section 53; wherein, the air inlet pipe section 51 and the water outlet pipe section 53 are both positioned below the water surface, and the air collecting pipe section 52 is connected with the air inlet pipe section 51 and the water outlet pipe section 53 and is positioned at the upper parts of the air inlet pipe section 51 and the water outlet pipe section 53.

The aeration head 4 is arranged in the intake water inlet pipe section 51 and aerates the oxygen pumped by the air pump 1 in the intake water inlet pipe section 51.

The gas collecting pipe section 52 is partially below the water surface and partially above the water surface, and an oxygen recovery pipe 7 is arranged between the gas collecting pipe section 52 and the air storage chamber 6, so that the oxygen collected by the gas collecting pipe section 52 is conveyed to the air storage chamber 6, and the utilization rate of the oxygen is improved.

The air reservoir 6 is located above the water surface and is connected to the oxygen gas source 3 and to the gas manifold section 52 via the oxygen recovery tube 7. The main body of the air storage chamber 6 is a rubber air bag.

A return pipe 8 and a flow regulating valve 9 positioned in the return pipe can be further arranged on the gas pipe 2 for conveying oxygen. When the air supply amount of the air pump 1 is far larger than the consumption amount of the aeration head 4, the flow regulating valve 9 can be opened to enable part of the compressed oxygen to flow back, so that the air pump 1 is prevented from being damaged due to overlarge pressure of the air pump.

Example 2

Fig. 2 shows another embodiment of the oxygen gas lift type aeration system for aquaculture water according to the present invention, which is the same as embodiment 1 except that: an air compensation valve 10 is arranged on the air storage chamber 6, and a boosting water pump 11 is additionally arranged in the aeration water pushing pipeline 5.

Example 3

Fig. 3 shows another embodiment of the oxygen lift type aeration system for aquaculture water according to the present invention, which is the same as embodiment 1 except that: an oxygen recovery pipe 7 is additionally arranged on the water outlet pipe section 53.

Example 4

Fig. 4 shows another embodiment of the oxygen lift type aeration system for aquaculture water according to the present invention, which is otherwise the same as embodiment 2 except that: the water inlet is arranged at the upper part of the water body.

Claims

1. An oxygen gas lift type oxygenation system comprises an air pump for circulating oxygen, a gas pipe for conveying the oxygen, an oxygen gas source for providing the oxygen, at least one aeration head for forcibly transferring gaseous oxygen in the oxygen to liquid water in a water body and at least one aeration water pushing pipe supported by a floater; the gas pipe transmits oxygen to the aeration water pushing pipe through the aeration head;

the oxygen gas lift type oxygenation system is characterized by further comprising at least one air storage chamber;

the aeration water pushing pipeline further comprises an air inlet pipe section, a gas collecting pipe section and a water outlet pipe section; the air inlet pipe section and the water outlet pipe section are both positioned below the water surface, and the air collecting pipe section is connected with the air inlet pipe section and the water outlet pipe section and is positioned at the upper parts of the air inlet pipe section and the water outlet pipe section;

the aeration head is arranged in the air inlet water inlet pipe section and is used for aerating the oxygen pumped by the air pump in the air inlet water inlet pipe section;

the at least one air storage chamber is at least partially positioned above the water surface, is connected to the oxygen gas source and is connected with the gas collecting pipe section and/or the water outlet pipe section.

2. The oxygen gas lift oxygenation system of claim 1, wherein said manifold section is partially below water and partially above water.

3. The oxygen gas lift system as recited in claim 2, further comprising at least one oxygen recovery tube connecting said at least one air reservoir to said gas header section and/or said water outlet section for delivering the collected oxygen to said at least one air reservoir.

4. The oxygen gas lift oxygenation system of claim 1, wherein the volume of said at least one reservoir is variable.

5. The oxygen gas lift oxygenation system of claim 4, wherein said at least one reservoir is an air bladder or at least a portion of said at least one reservoir is an air bladder.

6. The oxygen lift aeration system of claim 1 wherein said gas delivery conduit is further provided with a return conduit and a flow control valve positioned in said return conduit.

7. The oxygen gas lift aeration system of claim 1 wherein said at least one air reservoir is further provided with an air compensation valve or port.

8. The oxygen gas lift type oxygenation system of claim 1, wherein the inlet of the aeration push water pipeline is arranged at the lower part or the upper part of the water body.

9. The oxygen gas lift type oxygenation system of claim 1, wherein the water outlet of the aeration push water pipeline is arranged at the lower part of the water body.