阅读说明：本技术 一种自动往复式曝气强化装置 (Automatic reciprocating type aeration strengthening device ) 是由 周佳恒 王涛 徐晓蕾 郭文福 潘晨驰 于 2021-07-07 设计创作，主要内容包括：一种自动往复式曝气强化装置,所述装置包括曝气装置和限位装置,所述曝气装置为环形曝气装置,套在限位装置外；所述限位装置在环形曝气环中心,所述限位装置通过纵向限位器和横向限位器安装在底座上。本发明提供了一种能够增强底部水力扰动的自动往复式曝气强化装置,成本低,操作方便简单。(An automatic reciprocating type aeration strengthening device comprises an aeration device and a limiting device, wherein the aeration device is an annular aeration device and is sleeved outside the limiting device; the limiting device is arranged in the center of the annular aeration ring and is arranged on the base through a longitudinal limiter and a transverse limiter. The invention provides an automatic reciprocating type aeration strengthening device capable of strengthening bottom hydraulic disturbance, which is low in cost and convenient and simple to operate.)

1. An automatic reciprocating type aeration strengthening device is characterized by comprising an aeration device and a limiting device, wherein the aeration device is an annular aeration device and is sleeved outside the limiting device; the limiting device is arranged in the center of the annular aeration ring and is arranged on the base through a longitudinal limiter and a transverse limiter.

2. The automatic reciprocating aeration enhancing device according to claim 1, wherein the annular aeration device comprises an annular main body, an aeration membrane and an air inlet, the bottom of the annular main body is open, and the aeration membrane is fixed at the open position; the air inlet is located on the side edge of the annular main body and is connected with an air source through a pipeline.

3. The automatic reciprocating aeration enhancement device according to claim 2, wherein said aeration membrane is a microporous aeration membrane.

4. The automatic reciprocating aeration strengthening device of any one of claims 1 to 3, wherein the longitudinal stopper is a spring, the lateral stopper is a cylindrical rod, the top of the lateral stopper is provided with a cylindrical rod top cover, and the bottom of the lateral stopper is fixed on the base.

5. An automatic reciprocating type aeration enhancing apparatus according to any one of claims 1 to 3, wherein said base includes a support portion and an annular cover.

6. The automatic reciprocating aeration enhancing apparatus according to claim 4, wherein the other end of the spring is fixed at the center of the top cover of the aeration ring.

7. The automatic reciprocating aeration strengthening device of claim 2, wherein the aeration membrane is made of EPDM rubber, and the annular body is made of ABS plastic.

8. The automatic reciprocating aeration enhancing device as claimed in any one of claims 1 to 3, wherein the annular main body top cover portion has an inner diameter of 3.6 to 7cm, an outer diameter of 12 to 30cm and a height of 0.1 to 0.3 cm; the inner diameter of the annular main body is 4.2-8 cm, the outer diameter of the annular main body is 12-30 cm, the height of the annular main body is 0.9-2.7 cm, and the thickness of the thin wall of the annular main body is 0.1-0.3 cm.

9. The automatic reciprocating aeration enhancing apparatus according to claim 2, wherein the length of the air inlet is 1.5 to 3cm, the inner diameter is 0.4 to 1.2cm, the outer diameter is 0.6 to 1.8cm, and the distance from the upper side to the lower side of the main body is 0.2 to 0.6 cm.

10. An automatic reciprocating aeration enhancing device according to any one of claims 1 to 3, wherein the inner diameter of the aeration membrane is 4.4 to 8.6cm, and the outer diameter is 11.8 to 29.4 cm;

the spring is an extension spring, the outer diameter of the spring is 3.8-7.6 cm, the inner diameter of the spring is 3.4-7.2 cm, 15-30 circles are formed in total, and carbon spring steel wires are used as materials;

the diameter of the carbon spring steel wire is 0.2 cm;

the radius of the cylindrical rod is 1-3 cm, and the height of the cylindrical rod is 15-30 cm; the diameter of the top cover of the cylindrical rod is 6-12 cm, the thickness of the top cover of the cylindrical rod is 0.2-0.4 cm, and the cylindrical rod and the top cover of the cylindrical rod are made of ABS plastic;

the diameter of the bearing part of the base is 4.2-8 cm, and the height of the bearing part of the base is 0.1-0.5 cm; the inner diameter of the annular cover is 4-7.4 cm, the outer diameter of the annular cover is 4.2-8 cm, and the base is made of ABS plastic.

Technical Field

The invention belongs to the technical field of sewage treatment, and relates to an automatic reciprocating type aeration strengthening device.

Background

With the rapid development of cities in China and the increasing improvement of the living standard of people, the requirements on the living quality are higher and higher, and meanwhile, the problem of water pollution is more serious, so that most sewage plants in China are in an overload operation state at present.

Aeration, an important step in aerobic biological treatment processes, provides the power required for the movement of sludge in the reactor and sufficient dissolved oxygen for the survival of microorganisms. In the aeration process, the bubbles drive the water flow to move upwards together, and the sludge also moves upwards along with the water flow. The bubbles collide with each other and are broken in the moving process, and energy generated by a velocity gradient formed in the gas-liquid-solid three-phase moving process is dissipated, so that the required hydraulic shear is provided for the growth of the sludge. However, in research, the influence of bubbles on the water body in the area of the bottom aeration head is small, the kinetic energy of the fluid is small, a dead zone is easily formed, and a large amount of sludge at the bottom is accumulated. Therefore, the development of an aeration device capable of inhibiting bottom accumulation has important significance for the aerobic biological treatment process of sewage.

In the prior art, the disturbance of bubbles is enhanced by simply adopting a method for improving aeration quantity, so that the disturbance of a water body is enhanced, and the velocity gradient of a gas-liquid-solid three phase is improved. However, this method causes a large amount of energy waste, increases the dissolved oxygen content in the reactor, and greatly increases the operation cost.

Disclosure of Invention

In order to solve the problem of bottom accumulation in the traditional aeration mode, the invention provides the automatic reciprocating type aeration strengthening device capable of strengthening bottom hydraulic disturbance, which is low in cost and convenient and simple to operate.

The technical scheme adopted by the invention for solving the technical problems is as follows:

an automatic reciprocating type aeration strengthening device comprises an aeration device and a limiting device, wherein the aeration device is an annular aeration device and is sleeved outside the limiting device; the limiting device is arranged in the center of the annular aeration ring and is arranged on the base through a longitudinal limiter and a transverse limiter.

Further, the annular aeration device comprises an annular main body, an aeration membrane and an air inlet, wherein the bottom of the annular main body is open, and the aeration membrane is fixed at the position of the open; the air inlet is located on the side edge of the annular main body and is connected with an air source through a pipeline.

Preferably, the aeration membrane is a microporous aeration membrane.

Still further, the longitudinal limiter is a spring, the transverse limiter 5 is a cylindrical rod, a cylindrical rod top cover is arranged at the top of the transverse limiter, and the bottom of the transverse limiter is fixed on the base.

Still further, the base includes a retainer portion and an annular shield.

And the other end of the spring is fixed in the center of the top cover of the aeration ring.

The aeration membrane is made of EPDM rubber, and the annular main body is made of ABS plastic.

The inner diameter of the top cover part of the annular main body is 3.6-7 cm, the outer diameter is 12-30 cm, and the height is 0.1-0.3 cm; the inner diameter of the annular main body is 4.2-8 cm, the outer diameter of the annular main body is 12-30 cm, the height of the annular main body is 0.9-2.7 cm, and the thickness of the thin wall of the annular main body is 0.1-0.3 cm.

The length of the air inlet is 1.5-3 cm, the inner diameter is 0.4-1.2 cm, the outer diameter is 0.6-1.8 cm, and the distance from the upper part to the lower part of the main body is 0.2-0.6 cm.

The inner diameter of the aeration membrane is 4.4-8.6 cm, and the outer diameter of the aeration membrane is 11.8-29.4 cm.

The spring is an extension spring, the outer diameter of the spring is 3.8-7.6 cm, the inner diameter of the spring is 3.4-7.2 cm, 15-30 circles are formed in total, and carbon spring steel wires are used as materials.

The diameter of the carbon spring steel wire is 0.2 cm.

The radius of the cylindrical rod is 1-3 cm, and the height of the cylindrical rod is 15-30 cm; the diameter of the top cover of the cylindrical rod is 6-12 cm, and the thickness of the top cover of the cylindrical rod is 0.2-0.4 cm. The cylindrical rod and the top cover of the cylindrical rod are made of ABS plastic.

The diameter of the bearing part of the base is 4.2-8 cm, and the height of the bearing part of the base is 0.1-0.5 cm; the inner diameter of the annular cover is 4-7.4 cm, the outer diameter of the annular cover is 4.2-8 cm, and the base is made of ABS plastic.

In the invention, the annular aeration can enhance the influence range of bubbles, and is beneficial to optimizing the homogenization of the flow field in the reactor. In order to solve the problem of the dead zone at the bottom, the invention utilizes reverse aeration to strengthen the hydraulic disturbance at the bottom, and the generated reaction force can make the aeration device present a state of moving up and down, thereby further promoting the hydraulic disturbance at the bottom of the strengthening reactor.

The invention adopts the carbon spring steel wire as the spring material, has better strength and elasticity, and can generate stable pulling force to make the aeration device move downwards after the aeration device moves upwards as the axial limiter. The transverse limiter is made of a thin rod with the diameter of 1-3 cm, and the diameter of the thin rod is far smaller than the inner diameter of annular aeration, so that the aeration device has enough activity space in the transverse direction, the common characteristic of uneven aeration of the aeration device is fully utilized, and bottom hydraulic disturbance is enhanced better. The top cover is used for preventing the aeration device from deviating from the preset running track under the atmosphere.

Flow fields of a single conventional aeration device and the aeration device of the present invention were simulated separately using Flow 3D software. The simulation was carried out in a cylindrical reactor, simulating a depth of water of 20cm, an internal diameter of 19cm and an aeration rate of 3 L.min^-1. The results show that the flow field in the reactor has regular circular flow from the central area to the periphery and downwards under the conventional aeration device. The reactor flow field using the device of the invention has an inner circulation flow field and an outer circulation flow field, the influence range of bubbles is enlarged, and the hydraulic disturbance is enlarged due to the oscillation effect, and meanwhile, the circulation flow field can be damaged by the bubble disturbance, which is beneficial to promoting the homogenization of the reactor flow field. No extra energy is needed, the cost is low, and the implementation is simple and convenient.

The invention has the following beneficial effects: the annular aeration increases the influence range of bubbles, and meanwhile, the downward aeration enhances the hydraulic disturbance at the bottom of the reactor; can effectively inhibit the accumulation of sludge at the bottom, thereby enhancing the shearing force required by the growth of the sludge. The device provides a practical and feasible operation idea for further improving the treatment efficiency of the aerobic biological treatment process of the sewage, and the method for relatively increasing the aeration quantity has low cost, is easy to operate, and has high economical efficiency and practicability.

Drawings

Fig. 1 is a structural view of an automatic reciprocating aeration enhancing apparatus, wherein 1 denotes an aeration apparatus, 2 denotes an aeration membrane, 3 denotes an air inlet, 4 denotes a longitudinal stopper, 5 denotes a lateral stopper, 6 denotes a top cover, and 7 denotes a base.

FIG. 2 is a schematic view of the assembly of the present invention in a reactor.

Fig. 3 is a schematic operation detail view of the device of the present invention.

FIG. 4 is a view 2D (Y-Z) of the flow field in the reactor during the operation of conventional aeration.

FIG. 5 is a view of the flow field in the reactor 2D (Y-Z) during operation of the present invention.

Detailed Description

The invention is further described below with reference to the accompanying drawings.

Referring to fig. 1 to 5, an automatic reciprocating aeration strengthening device (fig. 1) comprises an aeration device 1 and a limiting device, wherein the aeration device 1 is an annular aeration device and is sleeved outside the limiting device 5; the limiting device is arranged in the center of the annular aeration ring and is arranged on the base 7 through a longitudinal limiter 4 and a transverse limiter 5.

Further, the annular aeration device comprises an annular main body, an aeration membrane 2 and an air inlet 3, wherein the bottom of the annular main body is open, and the aeration membrane 2 is fixed at the open position; the air inlet 3 is positioned on the side edge of the annular main body, and the air inlet 3 is connected with an air source through a pipeline.

Preferably, the aeration membrane 2 is a microporous aeration membrane.

Further, the longitudinal limiter 4 is a spring, the transverse limiter 5 is a cylindrical rod, a cylindrical rod top cover 6 is arranged at the top of the transverse limiter, and the bottom of the transverse limiter is fixed on the base 7.

Further, the base 7 includes a holding portion and an annular cover.

And the other end of the spring is fixed in the center of the top cover of the aeration ring.

In the embodiment, the inner diameter of the top cover part of the annular main body is 3.6cm, the outer diameter is 12cm, and the height is 0.1 cm; the inner diameter of the annular main body is 4.2cm, the outer diameter is 12cm, the height is 0.9cm, and the thickness of the thin wall is 0.1 cm. The inner diameter of the aeration membrane is 4.4cm, and the outer diameter is 11.8 cm. The air inlet is arranged on the side edge of the annular main body, the length of the air inlet is 1.5cm, the inner diameter of the air inlet is 0.4cm, the outer diameter of the air inlet is 0.6cm, the distance from the upper part to the lower part of the main body is 0.2cm, and the air inlet is connected with an air source through a pipeline. The limiting device is divided into a longitudinal limiter 4 and a transverse limiter 5. The longitudinal limiter is an extension spring, the outer diameter of the spring is 3.8cm, the inner diameter of the spring is 3.4cm, and the number of turns is 15, and the longitudinal limiter is made of carbon spring steel wires; the transverse limiter is a cylindrical rod with the diameter of 1cm and the height of 15cm, and the top cover 6 of the cylindrical rod at the upper part has the diameter of 6cm and the thickness of 0.2 cm. The limiters are all fixed on the base 7, and the other end of the spring is fixed at the center of the inner ring of the aeration device. The base is fixed on an air distribution pipe 8 (figure 2), and compressed air passes through the air distribution pipe and is connected with an air inlet on the aeration device through the air pipe.

When the aerator operates, the aerator is pushed to move upwards by the reverse acting force generated by the reverse aeration and then pulled back by the tension of the spring, thereby forming the up-and-down reciprocating motion (figure 3). And the transverse direction has enough moving space, so that the hydraulic disturbance is further strengthened.

The aeration membrane of the aeration device is made of EPDM rubber, and the density of the EPDM rubber is about 0.86 g-cm^-3The rest part is made of ABS plastic with the density of about 1.05g cm^-3The overall weight was about 16 g. The spring material is carbon spring steel wire, the diameter D of the material is 2mm, the spring pitch diameter D is 18mm, see GB/T2089-1994, and the test load is 128.3N; the shear modulus G was 79GPa and the elastic modulus E was 206 GPa. The spring stiffness k is calculated to be 1.8 N.mm^-1Compared with a single aeration head of 1.5-3 m in the aeration tank³·h^-1The spring can bear the reaction force generated by the conventional aeration quantity, and the spring cannot generate plastic deformation. The calculation formula of the spring stiffness is as follows:

in the formula: k-spring stiffness, N.mm^-1；

G-shear modulus, MPa;

d-the middle diameter of the spring is mm;

n-the number of effective turns of the spring, and the number of effective turns of the extension spring is equal to the total number of turns;

c-convolution ratio, C ═ D/D.

Flow fields of a single conventional aeration apparatus and the aeration apparatus of the present invention were simulated separately using Flow 3D software (fig. 4, 5). The result shows that compared with the conventional aeration device, the invention can well promote the homogenization of the flow field in the reactor, and the upward flow in a larger range can drive more sludge to flow upwards. Meanwhile, the reverse aeration has good impact effect on the sludge at the bottom, and can effectively inhibit the generation of dead zones at the bottom.

The embodiments described in this specification are merely illustrative of implementations of the inventive concepts, which are intended for purposes of illustration only. The scope of the present invention should not be construed as being limited to the particular forms set forth in the examples, but rather as being defined by the claims and the equivalents thereof which can occur to those skilled in the art upon consideration of the present inventive concept.