CN206457326U - A water-gas mixed oxygenation device - Google Patents

Abstract

The application discloses a water-air mixing oxygenation device. The water-air mixing oxygenation device comprises an aeration pipeline with a water inlet and a water outlet, wherein the water outlet of the aeration pipeline is larger than the water inlet, the water outlet of the aeration pipeline is gradually enlarged towards the water outlet in a shape similar to a cone by taking the water inlet as a starting point, and an air inlet is formed at the water inlet end; the interior of the aeration pipeline is provided with helical blades which are fixed on the inner wall of the aeration pipeline and extend from the water inlet to the water outlet in a helical manner to block the aeration pipeline into a helical channel. According to the oxygenation device, the spiral blades are designed in the aeration pipeline, so that the oxygenation device has the functions of flow guiding, turbulence and bubble crushing, and bubbles are uniform and tiny; the helical blades block the aeration pipeline into a helix shape, and water and gas are repeatedly turned and mixed in the helical blades, so that water and gas layering is avoided, and the gas dissolving efficiency is improved. The oxygenation device has the advantages of simple structure, convenience in use, easiness in installation, low use and maintenance cost and capability of meeting the requirements of sewage treatment or water purification under various conditions.

Description

A water-gas mixed oxygenation device

technical field

The present application relates to the field of aeration and oxygenation of water bodies, in particular to a water-gas mixing aeration device.

Background technique

Water body aeration and oxygenation devices are widely used in sewage treatment, aquaculture, river and lake treatment, tap water treatment, industrial sewage treatment and other fields. In the process of various sewage and wastewater treatment in sewage treatment plants, oxygenation of water body is a necessary link, and the energy consumption required for oxygenation accounts for more than 60% of the total energy consumption and about 40% of the total operating cost. By 2015, the daily sewage treatment capacity in the country will reach about 200 million tons, and the daily power consumption of aeration will reach 50-100 million kwh. Therefore, the high-efficiency and low-consumption aeration and oxygenation technology and equipment have great economic value and social benefits. In terms of aquaculture, China is the largest aquaculture country in the world, with aquaculture production accounting for 70% of the world, and the area of freshwater and seawater aquaculture is about 100 million mu. The aeration device is the most important necessary equipment for various aquaculture. It can dissolve the oxygen in the air into the water body, increase the amount of dissolved oxygen in the water body, increase the density of aquaculture, avoid aquatic products from being sick and die due to the lack of oxygen in the water body, and reduce the water quality. pollute. A higher dissolved oxygen content in water can accelerate the growth rate of aquatic products, reduce the amount of bait and medicine used, reduce the discharge of aquaculture wastewater, improve the quality and quality of aquatic products, and improve the efficiency of aquaculture in many ways. In addition, small-scale aeration and oxygenation devices are necessary for the breeding of ornamental fish ponds, the transportation and sales of fresh aquatic products, and the preservation and freshness of restaurants and restaurants. very low.

In terms of river and lake governance, more than 60% of China's rivers and lakes are polluted to varying degrees, and the massive discharge of industrial and agricultural wastewater and domestic wastewater has greatly increased the COD, BOD, nitrogen, and phosphorus contents of the water body. Exceeding the standard, frequent and large-scale outbreaks of blue-green algae, serious water hypoxia, organic matter cannot be aerobically decomposed in a timely manner, and anaerobic bacteria multiply, causing the water to turn black and smelly, aquatic animals and plants cannot survive, and the water loses its ecological function of self-recovery. One of the most effective and essential means of its governance is to add oxygen to the water through an aerator, increase the dissolved oxygen in the water, reduce COD and BOD, and provide the necessary oxygen for the survival and reproduction of aerobic microorganisms, phytoplankton and even aquatic animals and plants. And good conditions, restore the self-purification ability and ecological function of the water body, and improve the water quality. At present, some engineering cases have proved that aeration and oxygen enhancement alone or in combination with other measures, such as aeration and oxygen enhancement combined with biofilm technology, can effectively eliminate black and odorous water bodies, prevent algae outbreaks, increase the production of aquatic animals and plants, and reduce pollution in water bodies. resources. In terms of tap water processing, aeration and oxygenation equipment must be used in the tap water processing and treatment process, especially the iron and manganese removal processes.

Existing water body oxygenation equipment can be roughly divided into two categories: water surface mechanical oxygenation and underwater aeration oxygenation. There are impeller type, waterwheel type, fountain type, rotating disk and brush type, and drop water type for mechanical oxygenation on the water surface; microporous aeration type and jet aeration type for underwater oxygenation. The water surface mechanical aeration equipment generally stirs the shallow water body or splashes or drops the water into the air, increases the contact surface between the water body and the air, dissolves the oxygen in the air into the water, and increases the dissolved oxygen in the water body. The disadvantage is that it consumes a lot of energy, often only increases the oxygen content on the surface of the water body, but has a poor oxygenation effect on the bottom of the water body, is not suitable for oxygenation in deeper water bodies, and has high noise and weak water circulation.

Microporous aeration type aerator is typical for underwater aeration and oxygenation. It is sent to the aerator through the air pipeline laid on the bottom of the water, and discharged into the water in the form of small bubbles from the micropores of the aerator to achieve the purpose of increasing oxygen in various depths of water. The disadvantage is that the deeper the water body, the higher the air pressure required, and the energy consumption is relatively large; moreover, the higher the air pressure, the higher the gas temperature, and some energy is wasted in the form of heat dissipation. The aging of the gas pipeline affects the service life. In addition, the effective service area of each aeration tube or each aeration head of the microporous aeration aerator is limited, so it is necessary to lay and install a large number of air pipelines, aeration tubes or aeration pans in a large area near the bottom of the water. The construction volume and construction difficulty are large. It is generally necessary to drain the water in the pool or pond during installation; this makes it difficult to install and use large areas of lakes and rivers. In addition, the microporous aeration type aerator also has a series of problems such as easy blockage of the aeration holes, failure of the aeration machine due to aging of the air pipe, aeration pipe, and aeration disc, short service life of the facility, many faults, and difficult maintenance. question. The existing, conventional microporous aeration aerator has an oxygen power coefficient of 3-6kg O ₂ /(kW·h), that is, each kilowatt-hour of electricity can increase oxygen by 3-6kg, which is the best oxygen power of various aerators. The power coefficient of other types of aerators with the highest coefficient is generally below 3kgO ₂ /(kW·h); even so, the energy consumption of microporous aeration aerators cannot be underestimated. The jet-type aeration aerator for underwater oxygenation sucks or presses the air into the high-speed water flow and sprays it underwater. The oxygenation effect of the water below the surface is better than that of the water surface oxygenation equipment. The spray distance is limited, and the overall circulation effect is poor. At present, the more conventional water body oxygenation devices and their advantages and disadvantages are shown in Table 1.

Table 1 Water body oxygenation device

Existing various types of aeration equipment have limited room for further improvement due to limitations of their working principles. At the same time, each type of equipment has its own shortcomings: high energy consumption, poor three-dimensional circulation function, difficult construction, high failure rate, difficult maintenance, and short service life.

my country's per capita fresh water resources are not many, and some water resources have been polluted to varying degrees. With the acceleration of urbanization in our country, the development of the national economy and the continuous improvement of people's living standards, the demand for water will increase, and the requirements for water quality will also become higher and higher. Aeration and oxygenation technology occupies a very important position in water treatment process and aquaculture and other industries. Relevant domestic technical workers have been pursuing and researching efficient, energy-saving and high-quality aeration and oxygenation technology to meet the social demand for water. resource needs.

In addition, many domestic sewage treatment plants have been in operation for many years, and the aeration system is seriously aging. With the upgrading and upgrading of sewage treatment plants, it is urgent to transform their treatment processes and aeration systems. The service life of microporous aerators provided by domestic merchants is rarely more than three years, and the aeration systems of most sewage treatment plants are operating with diseases. At this stage, research on new aerators, such as the new jet aerator, is widely used because of its good effect, not easy to block, and low energy consumption. The energy consumption of the aerobic biological treatment aeration system accounts for 60% to 70% of the entire sewage treatment plant. It is foreseeable that for a long period of time in the future, the technical transformation of the old plant will be the focus of general attention in the industry. The continuous construction of new sewage treatment plants has provided a broad market space for new high-efficiency energy-saving aeration systems.

Therefore, designing a reliable, efficient and energy-saving aeration system has practical significance for the stable operation of the sewage treatment system, energy saving and consumption reduction.

Contents of the invention

The purpose of this application is to provide a water-gas mixing aeration device with a brand new structure.

The application adopts the following technical solutions:

One aspect of the present application discloses a water-gas mixed aeration device. The water-gas mixed aeration device of the present application includes an aeration pipeline with a water inlet 11 and a water outlet 12. The water outlet 12 of the aeration pipeline is larger than the water inlet 11. , the aeration pipeline takes the water inlet 11 as the starting point, and gradually expands toward the water outlet 12 in a similar conical shape. The water inlet end of the aeration pipeline is designed with an air inlet 13; Fixed on the inner wall of the aeration pipe, spirally extending from the water inlet 11 to the water outlet 12, blocking the aeration pipe into a spiral channel; water and air enter the aeration pipe and mix through the spiral blade 14, and finally discharge through the water outlet 12 .

Among them, the aeration pipe starts from the water inlet 11 and gradually expands toward the water outlet 12 in a similar conical shape, which means that the aeration pipe gradually increases in the shape of a trumpet. The advantage of this design is that after the water and air are further fully mixed , will inevitably expand the volume of the water body. Therefore, the gradually enlarged aeration pipe provides space conditions for the water-gas mixing and expansion. Of course, the aeration pipeline of the present application is only enlarged in a conical shape, not completely enlarged according to the conical structure. For example, in a preferred solution of the present application, the aeration pipeline is composed of three-stage pipelines, each pipeline Gradually increasing can also meet the usage requirements of this application.

It should be noted that, in the water-air mixing aeration device of the present application, the water body enters through the water inlet 11, and the air enters through the air inlet 13, and then the two are repeatedly mixed in the spiral channel formed by the spiral blade 14. The spiral blade 14 has The function of diversion, turbulence and bubble fragmentation produces uniform and tiny bubbles, which effectively improves the effect of aeration and oxygenation.

Preferably, several one-way air inlet pipes 131 or one-way water inlet pipes 111 are also arranged on the side wall of the aeration pipe.

It should be noted that, in the preferred solution of this application, several inclined one-way pipes are arranged on the side wall of the aeration pipe. To the water inlet pipe 111. Since the water in the aeration pipe flows toward the water outlet, and the water or gas outside the aeration pipe is relatively static, if the increase in the kinetic energy of the water in the aeration pipe is greater than the hydrostatic pressure here, the water pressure here is Below the atmospheric pressure, the following effects can be achieved individually or simultaneously: reduce the power consumption of the blower and increase the aeration volume; when the water pressure is lower than the atmospheric pressure, the blower does not need to do work, and under the action of the atmospheric pressure, the air on the water surface passes through the one-way intake pipe 131 is inhaled, and the aeration is increased, so-called negative pressure reactive aeration can be carried out. At the same time, the water outside the aeration pipe will flow into the aeration pipe through the one-way water inlet pipe 111 to participate in aeration, which can realize a larger aeration area and aeration volume, and because the air bubbles are small, the contact area between the gas and liquid phases Larger, the dissolved gas efficiency increases.

Preferably, in the water-gas mixing aeration device of the present application, the aeration pipeline is assembled in three stages including the first-level pipeline 01, the second-level pipeline 02 and the third-level pipeline 03. The first-level pipeline 01, the second-level pipeline The cross-sectional areas and lengths of the first-stage pipeline 02 and the third-stage pipeline 03 increase sequentially, the water inlet 11 is designed in the first-stage pipeline 01 , and the water outlet 12 is designed in the third-stage pipeline 03 .

It should be noted that in this application, three stages of gradually increasing pipes are used to assemble the aeration pipes. One can meet the gradually increasing design and use requirements of the aeration pipes. And transportation is also easier.

Preferably, several fine microholes 141 are designed on the helical blade 14 .

It should be noted that the design of the spiral blade is to make the water and air mix more effectively, and the microholes 141 can further cut the air and water, so that they can be dispersed more effectively and uniformly.

Preferably, the water-gas mixing aeration device of the present application also includes a water pump and a blower used in conjunction with each other, the water pump is connected to the water inlet 11 , and the blower is connected to the air inlet 13 .

It should be noted that the key to this application lies in the design of the structure of the aeration pipeline and its internal spiral blades. As for the water pump and blower, it can be equipped according to actual use requirements. It should also be noted that the hydrostatic pressure value in the aeration pipeline of the water-gas mixing aeration device of the present application is smaller than the kinetic energy value increased by the water flowing through the channel during operation, so the aeration pressure is reduced, and the outside air will Because the atmospheric pressure difference enters the water, and the location of the pipeline is the surface of the water body, the water pressure is low, so only a low-power blower device is needed to achieve a good aeration and oxygenation effect, saving equipment investment and operating costs. Moreover, the effect of increasing oxygen is related to the length of the aeration pipeline. The longer the aeration pipeline, the more oxygen will be increased. The specific length of the aeration pipeline, water pump and blower can be determined according to the use requirements, and is not specifically limited here.

Another aspect of the present application discloses the application of the water-gas mixing aeration device of the present application in the aeration and oxygenation of shallow water bodies.

It should be noted that the water-air mixing aeration device of the present application is designed for the aeration of shallow water bodies. The aeration of shallow water bodies not only has a good oxygenation effect, but also has low energy consumption; The oxygen device further reduces energy consumption while improving the effect of aeration and oxygenation.

The beneficial effect of this application is:

The water-air mixing aeration device of the present application is designed with spiral blades in the aeration pipe, which has the functions of diversion, turbulence and air bubble fragmentation, so that the generated air bubbles are more uniform and tiny; moreover, the spiral blades block the aeration pipe In a spiral shape, the water body and air bubbles are repeatedly turned and mixed in it, avoiding the stratification of water and air, and improving the efficiency of dissolved air. The water-gas mixing aeration device of the present application has a simple structure, is convenient to use, is easy to install, and has low use and maintenance costs, and can meet the use requirements of sewage treatment or water body purification under various conditions.

Description of drawings

Fig. 1 is the structural representation of water-gas mixing aeration device in the embodiment of the present application;

Fig. 2 is the structural representation of the helical blade inside the aeration pipeline of the water-gas mixing aeration device in the embodiment of the present application;

Fig. 3 is a structural schematic diagram of another angle of the helical blade in the embodiment of the present application;

Fig. 4 is a structural schematic view of another angle of the helical blade in the embodiment of the present application.

detailed description

In the water-air mixing aeration device of the present application, spiral blades are designed inside the aeration pipe, and the air enters through the air inlet, first forming bubbles and then continuously breaking and merging in the spiral aeration pipe formed by the spiral blades, and finally in the liquid The surface breaks and dissipates, and the oxygen is transferred from the gas phase to the liquid phase through the contact of the gas-liquid interface. Among them, when the gas-liquid two-phase mixture passes through the helical blade, due to the shearing effect of turbulent flow and the cutting effect of the micropores on the helical blade and the helical blade, the bubbles are deformed, split, and fragmented, and microbubbles are generated, which increases the gas-liquid two-phase mixture. The contact area of the phase improves the mass transfer efficiency of oxygen in water; at the same time, the helical blade will carry water and air to overcome the friction force to make a circular motion, and push the water and air to rotate along the axial direction, playing a role of diversion; The density of tiny air bubbles is very small. If they are directly transported through a pipeline without spiral blades, the air bubbles will float upwards due to buoyancy, resulting in gas-liquid stratification and poor gas-dissolving effect. The design of the spiral blades in this application destroys the In the laminar flow of the flow field, the adjacent flow layers slide and mix with each other. At this time, the inertial force of the flow field is greater than the viscous force, the fluid flow is unstable, and the small changes in the flow velocity are easy to develop and strengthen, forming a disordered and irregular flow. Turbulent flow, the gas-liquid stratification is thus broken, and the gas-liquid mixes evenly.

Furthermore, the gas and water mixing pipeline of the present application, that is, the aeration pipeline is usually installed on the surface of the water body, with some parts exposed to the water surface, which is conducive to the entry of outside air, and the water body flows quickly. According to the Bernoulli equation, it can be known that the flow rate is fast and the pressure is high. Small, so that the pressure at the gas-liquid contact interface becomes smaller, which is conducive to the dissolution of air at the contact surface into the water body; when the delivery pipe is close to the water surface, the blown air generates a large number of bubbles, which are strongly disturbed on the liquid surface and overflow. There is very little disturbance in the environment, and the oxygenation efficiency is low, but the addition of a long enough aeration pipe creates sufficient time for gas-liquid contact, which is conducive to full mixing of gas and liquid, and the extended aeration pipe creates a longer gas-liquid contact time , which is enough to compensate for the oxygen transfer loss caused by shortening the rising distance of the bubbles. At the same time, the water pressure on the surface of the water body is low, the wind pressure is low, and the power consumption of the fan can be reduced accordingly, which can achieve the effect of obtaining high oxygenation efficiency with low-pressure air supply. Moreover, when in use, a partition board can be installed in the middle of the pool, and the water at the bottom of the pool can be sent to the water inlet of the water-air mixing aeration device through a water pump, so that the water body can circulate up and down in a three-dimensional manner, without the need to install an underwater thruster. Realize the oxygenation of bottom water body.

In addition, from the Bernoulli equation of fluid mechanics, it can be known that in a steady continuous water flow in a pipeline, that is, the flow field does not change with time, if friction is not considered, and there is no external force except gravity, the water flow at different positions The water bodies conform to the following rules: kinetic energy + pressure - static pressure generated by water depth = constant value, where the static pressure generated by water depth is hydrostatic pressure, hydrostatic pressure = water depth × specific gravity of water, hydrostatic pressure is only related to water depth, and has nothing to do with kinetic energy ; Therefore, when the flow velocity of a certain position increases, the kinetic energy also increases accordingly, and the kinetic energy is proportional to the square of the velocity, then the water pressure at this position decreases correspondingly; when the flow velocity of a certain position decreases, the kinetic energy also decreases, The water pressure increases accordingly. Therefore, according to the above rules, the principle of variation of the aeration pipeline of the present application is proposed: the water inlet and outlet of a pipeline are respectively connected with the external water body, the inside of the aeration pipeline forms a water flow channel isolated from the external water body, and the spiral blade is installed in the aeration pipeline, and the water body along the The guidance of the spiral blades is a spiral flow to the water outlet, that is, the flow direction of the water body is parallel to the spiral blades. When the water flows through the spiral blades at high speed, the water pressure on the aeration surface will decrease, and it will be significantly lower than that of the water at the same depth as the external water body. Therefore, the aeration pressure is reduced. At the same time, holes are opened on the side of the aeration pipe to connect the inclined pipe, that is, the one-way inlet pipe and the one-way water inlet pipe. The water inlet pipe flows in and replenishes, and the air also enters through the one-way inlet pipe, which increases the aeration volume, reduces the power consumption of aeration, and increases the oxygen kinetic coefficient. The gas-liquid two-phase mixture flows from the aeration pipe with a small cross-sectional area into the aeration pipe with a large cross-sectional area, the flow rate decreases, the water pressure increases, and the tiny bubbles are compressed and ruptured, which is conducive to the further dissolution of oxygen in the water body and improves Oxygen transfer efficiency. For example, the external device does work on the water flow, W is the work done by the work device on the unit volume of water body, the kinetic energy of the upstream water body of the work device + pressure - hydrostatic pressure = H1, the kinetic energy of the downstream water body of the work device + pressure - hydrostatic pressure = H2 , then W=H2-H1, if W is much smaller than the change value of kinetic energy, then the influence of W can be ignored when calculating the conversion of kinetic energy and pressure.

The water-gas mixing aeration device of the present application, during operation, the hydrostatic pressure value in the aeration pipeline is smaller than the kinetic energy value increased by the water flowing through the channel, so the aeration pressure is reduced, and the outside air will enter due to the atmospheric pressure difference In the aeration pipeline, and the location of the pipeline is the surface of the water body, the water pressure is low, so only a low-power blower device is needed to save equipment investment and operating costs; The gas-liquid is not stratified, the bubbles are uniform, and the oxygen transfer rate is improved; when the length of the pipeline is long enough, although the aeration and oxygenation of the shallow water body, the oxygenation effect can be compared with the deep aeration, and it can be realized Three-dimensional circulation of water body; convenient operation and management, good effect of aeration and oxygenation; the whole system structure is simple, flexible and convenient to combine; total investment cost is low and maintenance is simple.

The present application will be described in further detail below through specific embodiments and accompanying drawings. The following examples and drawings only further illustrate the present application, and should not be construed as limiting the present application.

Example

The water-air mixed aeration device of this example is shown in Figure 1, and includes an aeration pipeline with a water inlet 11 and a water outlet 12, and the aeration pipeline is composed of a first-level pipeline 01, a second-level pipeline 02 and a third-level pipeline 03 It is assembled in three stages. The cross-sectional area and length of the first-stage pipeline 01, the second-stage pipeline 02 and the third-stage pipeline 03 are all sequentially increased. The water inlet 11 is designed on the first-stage pipeline 01, and the water outlet 12 is designed The third-stage pipeline 03; the water inlet end of the aeration pipeline is designed with an air inlet 13; the inside of the aeration pipeline is designed with a spiral blade 14, as shown in Figure 2, Figure 3 and Figure 4, the spiral blade 14 is fixed on the aeration On the inner wall of the pipe, it extends spirally from the water inlet 11 to the water outlet 12, blocking the aeration pipe into a spiral channel; the spiral blade 14 is designed with several small micropores 141; the first stage pipe 01 and the second stage The assembly position of the pipeline 02, as well as the assembly position of the second-level pipeline 02 and the third-level pipeline 03, are designed with a number of inclined one-way pipelines, namely the one-way air inlet pipe 131 and the one-way water inlet pipe 111; The air pipe is then mixed by the spiral blade 14, and finally discharged from the water outlet 12.

During use, the water-air mixing aeration device of this example is connected with an external water pump and blower, that is, the water pump is communicated with the water inlet 11, and the blower is communicated with the air inlet 13; the water-air mixing aeration device of this example is installed in Shallow water body, the water outlet 12 goes deep into the shallow layer of the water body, the water inlet 11 is exposed in the air, the entire aeration pipe is inserted obliquely into the water, and the suction pipe of the water pump goes deep into the bottom of the water body to pump water into the aeration pipe , to realize the upper and lower circulation of the water body.

The above content is a further detailed description of the present application in conjunction with specific implementation modes, and it cannot be considered that the specific implementation of the present application is limited to these descriptions. For those of ordinary skill in the technical field to which this application belongs, some simple deduction or substitutions can be made without departing from the concept of this application, which should be deemed to belong to the protection scope of this application.

Claims (5)

1. a water-gas mixed aeration device, is characterized in that: comprise the aeration pipeline with water inlet (11) and water outlet (12), the water outlet (12) of aeration pipeline is greater than water inlet (11), aeration The air pipeline takes the water inlet (11) as the starting point, and gradually expands towards the water outlet (12) in a similar conical shape. The water inlet end of the aeration pipeline is designed with an air inlet (13); the inside of the aeration pipeline is designed with spiral blades ( 14), the helical blade (14) is fixed on the inner wall of the aeration pipe, and extends spirally from the water inlet (11) to the water outlet (12), blocking the aeration pipe into a spiral channel; after water and air enter the aeration pipe It is mixed by the spiral blade (14) and finally discharged from the water outlet (12). 2. The water-gas mixing aeration device according to claim 1, characterized in that: several one-way air inlet pipes (131) or one-way water inlet pipes (111) are also arranged on the side wall of the aeration pipe. 3. The water-gas mixing aeration device according to claim 2, characterized in that: the aeration pipeline is composed of a first-level pipeline (01), a second-level pipeline (02) and a third-level pipeline (03). Assembled in three stages, the cross-sectional area and length of the first-stage pipe (01), second-stage pipe (02) and third-stage pipe (03) increase sequentially, and the water inlet (11) is designed at the first stage Pipeline (01), water outlet (12) is designed in the tertiary pipeline (03). 4. The water-gas mixing aeration device according to any one of claims 1-3, characterized in that: the helical blade (14) is designed with several fine micropores (141). 5. The water-gas mixing aeration device according to any one of claims 1-3, characterized in that: it also includes a water pump and a blower for supporting use, the water pump communicates with the water inlet (11), and the blower communicates with the water inlet (11). Air port (13) is connected.