CN103224296B - Air-supply-type self-excited oscillation pulse jet aerator - Google Patents
Air-supply-type self-excited oscillation pulse jet aerator Download PDFInfo
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- CN103224296B CN103224296B CN201310148240.1A CN201310148240A CN103224296B CN 103224296 B CN103224296 B CN 103224296B CN 201310148240 A CN201310148240 A CN 201310148240A CN 103224296 B CN103224296 B CN 103224296B
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W10/00—Technologies for wastewater treatment
- Y02W10/10—Biological treatment of water, waste water, or sewage
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Abstract
The invention relates to an air-supply-type self-excited oscillation pulse jet aerator, and belongs to the technical field of environment-protecting devices. The invention relates to an improvement of the structure of a self-excited oscillation pulse jet aerator used for processing sewage. With the aerator provided by the invention, problems such as high energy consumption and low air-liquid mixing efficiency of an existing jet aerator are solved, and oxygenation efficiency is improved. The aerator comprises a housing. In the housing, form one side end face to the other side end face of the housing, a water inlet chamber, a nozzle, an air absorption chamber, a self-excited oscillation chamber inlet pipe, a self-excited oscillation chamber, a self-excited oscillation chamber outlet pipe, and a diffusion chamber are sequentially arranged. The inlet of the water inlet chamber is arranged on one side end face of the housing, and communicates with the nozzle. The nozzle communicates with the air absorption chamber. The air absorption chamber communicates with the self-excited oscillation chamber through the self-excited oscillation chamber inlet pipe. The self-excited oscillation chamber communicates with the diffusion chamber through the self-excited oscillation chamber outlet pipe. The outlet of the diffusion chamber is arranged on the other side end face of the housing. An air inlet is arranged on a side wall of the housing, and communicates with the air absorption chamber.
Description
Technical field
The invention belongs to technical field of environment protection equipment, relate to a kind of improvement of self-excited oscillation pulsed water jet aerator structure of disposing of sewage, particularly relate to a kind of Gas feeding self-excited oscillation pulsed water jet aerator.
Background technology
At present, in the main flow biochemical process treatment process of sewage disposal, aerator is main energy consumption equipment, and the power consumption of aerating system accounts for 50 ~ 70% of the whole power consumption for the treatment of plant.Realize the aeration effect of aerator and reach energy-saving and cost-reducing object simultaneously, just becoming the large common problem of pendulum in industry member.
Conventional aeration mode mainly contains blast aeration, mechanical aeration and jet-flow aeration three kinds.The jet aerator adopting jet-flow aeration mode is a kind of aerator integrating air-breathing and hybrid reaction, it to be aspirated gas by hydrofluidic and compresses, and utilize bubble diffusion and these two effects of hydraulic shear to reach the object of aeration and mixing, compare with traditional aerator, have that structure is simple, oxygenation capacity is high, energy consumption is low, take up an area and economize and the advantage such as initial cost is few.
Conventional fluidic aerator structure as shown in Figure 1, forms primarily of conical nozzle 1, induction chamber 2, trunnion 3, expansion section 4 and tail pipe 5 five part.Its principle of work is as follows: based on jet current principle, sewage sprays through conical nozzle 1 as power water, form the fluid of a branch of random flowing, static air in collision jet both sides induction chamber 2 also drives them to travel forward together, gas and power water mix in trunnion 3, recover pressure energy gradually through expansion section 4, discharged by tail pipe 5.
Although conventional fluidic aerator has many advantages compared with blast aeration and mechanical aeration, also there is following shortcoming:
(1) small bubbles are easily assembled and are formed air pocket overflow from the water surface in the neighboring area of expansion section outlet, reduce its mass transfer coefficient and oxygenation capacity; (2) adopt long mixing tube structure to add the flowage friction of aeration fluid, reduce the dynamic efficiency of aerator, add energy consumption; (3) mixing effect is limited, and the water body flow of sometimes having in additional agitator promotion aeration tank is to prevent the generation in dead band.
The theory of self-excited oscillation pulsed water jet is applied to conventional fluidic aerator by the people such as University Of Chongqing Kang Yong beacon, add the expansion section 4 that self-sustained oscillation room 9 instead of conventional fluidic aerator, structure as shown in Figure 2, mainly comprises fluid and drives nozzle 6, air suction pipe 7, mixing chamber 8, self-sustained oscillation room 9, impact walls 10 and diffuser tube 11 6 part.Its principle of work is as follows: motive fluid drives nozzle 6 to spray by fluid and forms jet, and the air in mixing chamber 8 is carried by jet and enters self-sustained oscillation room 9, and mixing chamber 8 forms low pressure area, and air supplements into mixing chamber 8 through air suction pipe 7; In self-sustained oscillation room 9, gas-liquid two-phase contact surface constantly and impact walls 10 clash into, and exchange fast under violent self-sustained oscillation effect, violent turbulent fluctuation and shearing is there is in aerobic water body in self-sustained oscillation shear field, improve the Convention diffusion ability of water body, gas-liquid has carried out sufficient mixing, shears less by bubble simultaneously, forms micro-bubble; Well-mixed gas-liquid two-phase sprays in the form of a pulse through diffuser tube 11, reduces the possibility of bubble coalescence, and micro-bubble extends the time stopped in water simultaneously, namely extends the mass transfer time, improves the transfer efficiency of oxygen.
Described self-excited oscillation pulsed water jet utilizes hydrokinetics, fluid resonant, the elasticity of fluid and underwater acoustics principle to produce self-excited oscillation pulsed water jet.The advantage of self-excited oscillation pulsed water jet is not need extrinsic motivated source, utilizes the structural changes of self-sustained oscillation room 9 itself just can reach the effect of pulsing jet, cavitation jet.Self-sustained oscillation room 9 has that structure is simple, volume is little, without motion seal, without additional drive unit and movable part and save the particular advantages such as energy, aerobic water body and air is made to produce self-sustained oscillation effect under the condition without the need to any utility appliance, make both that violent interaction occur, produce following effect:
(1) bubble is sheared less by the shear field that self-sustained oscillation is formed, and increases the surface-area of bubble, namely increases the contact area of gas-liquid two-phase contact surface;
(2) gas-liquid two-phase contact surface converts fast under violent self-sustained oscillation effect, accelerate the renewal of liquid film on liquid-vapo(u)r interface, the violent turbulent fluctuation that shear field brings and shearing, improve the Convention diffusion ability of water body, and solution-air obtains mixing fully;
(3) impulse jet improves out pressure and the speed of stream, improves the water body convection current ability in aeration tank, increases service area, also reduce the possibility of bubble coalescence.
The design of the people such as Kang Yongfeng is only based upon on the basis of experimental study, lacks the theory support of system, has the following disadvantages simultaneously: (1) adopts self-priming offering oxygen way, can not meet aeration demand during high oxygenation capacity; (2) fluid drives nozzle more than 6 to adopt conical contraction structure, and angle of throat is 12.5 ° ~ 13.5 °, elongate form, and cause fluid to drive nozzle 6 inner fluid resistance comparatively large, energy consumption increases; (3) design is mainly based on experimental result, and the flow state of stream field inside lacks the details such as velocity distribution, pressure field, the design of equipment is lacked to the theoretical analysis of system.
Summary of the invention
For prior art Problems existing, the invention provides a kind of Gas feeding self-excited oscillation pulsed water jet aerator, this aerator solve existing jet aerator power consumption high, stir property poor, the inefficient problem of gas-liquid mixed, improve oxygen-transfer efficiency, for providing a μm level bubble in a liquid.
To achieve these goals, the present invention adopts following technical scheme, a kind of Gas feeding self-excited oscillation pulsed water jet aerator, comprise housing, intake antrum, nozzle, suction muffler, the self-excited oscillation cavity entrance trunnion, the self-excited oscillation cavity, the self-excited oscillation cavity outlet trunnion and diffusion chamber is disposed with in housing, from a side end face of housing to opposite side end face, the entrance of described intake antrum is arranged on a side end face of housing, and the outlet of intake antrum is connected with the entrance of nozzle, the outlet of nozzle is connected with the entrance of suction muffler, and the outlet of suction muffler is connected with the entrance of the self-excited oscillation cavity through the self-excited oscillation cavity entrance trunnion, the outlet of the self-excited oscillation cavity is connected with the entrance of diffusion chamber through the self-excited oscillation cavity outlet trunnion, and the outlet of diffusion chamber is arranged on the opposite side end face of housing, housing sidewall is provided with gas inlet, and gas inlet is connected with suction muffler, described the self-excited oscillation cavity inlet diameter and nozzle outlet diameter proportional range are 1.2 ~ 1.4, described the self-excited oscillation cavity exit diameter and nozzle outlet diameter proportional range are 1.3 ~ 1.6, described the self-excited oscillation cavity entrance is 2.8 ~ 3.0 to outlet distance with nozzle outlet diameter proportional range, described the self-excited oscillation cavity diameter and nozzle outlet diameter proportional range are 6 ~ 8, described the self-excited oscillation cavity entrance length of throat and nozzle outlet diameter proportional range are 1.4 ~ 1.7, described the self-excited oscillation cavity outlet length of throat and nozzle outlet diameter proportional range are 1.5 ~ 1.8, described the self-excited oscillation cavity exit cone angle scope is 110 ° ~ 120 °, by the pulsation storing energy of jet boundary in this self-excited oscillation cavity, fluid is made to produce periodically pulsing, ripple frequency f relational expression is:
in formula, a is local velocity of sound, and unit is m/s, A is that nozzle inlet section amasss, and unit is m
2, V is nozzle chamber volume, and unit is m
3, l be the self-excited oscillation cavity entrance to exporting distance, unit is m, described intake antrum diameter and nozzle outlet diameter proportional range are 1.2 ~ 1.4, described air inlet diameter and nozzle outlet diameter proportional range are 2 ~ 3, described jet exit is 1.5 ~ 2.0 to the distance of the self-excited oscillation cavity entrance trunnion entrance and nozzle outlet diameter proportional range, described diffusion chamber length and nozzle outlet diameter proportional range are 2.0 ~ 4.0, described gas inlet axis place is 2.0 ~ 3.0 to the distance of the self-excited oscillation cavity entrance trunnion entrance and nozzle outlet diameter proportional range, described suction muffler exit cone angle scope is 50 ° ~ 70 °, described diffusion chamber cone angle scope is 4 ° ~ 7 °, described nozzle is inner chamber is the nozzle that circular arc is shunk, and the size range of nozzle outlet diameter is 20 ~ 40mm.
Described housing is cylindrical.
Beneficial effect of the present invention:
The invention solves existing jet aerator power consumption high, stir property poor, the inefficient problem of gas-liquid mixed, improve oxygen-transfer efficiency, for providing a μm level bubble in a liquid.The present invention is applicable to the wastewater treatment that the depth of water is 5 ~ 9m, and oxygen transfer efficiency reaches 35% ~ 42%, and gas-water ratio reaches 4:1.Specific features is as follows:
(1) the present invention adopts the self-excited oscillation cavity to replace expansion section and the tail pipe of conventional fluidic aerator, rely on self-sustained oscillation effect, gas-liquid mixing liquid carries out repeatedly violent shearing, make the air of suction and aerobic water body in the self-excited oscillation cavity, obtain abundant Agitation and mixing, the renewal speed of liquid film on gas-liquid two-phase contact surface when accelerating aeration, form μm level micro-bubble, and then increase the contact area of supporting water body and air;
(2) the gas-liquid mixing liquid in the present invention is discharged by diffusion chamber in a pulsed fashion, from the aerobic water body of diffusion chamber ejection, there is stronger pulse effects, improve the outlet surging force of fluid, and then improve the mixing effect of jet aerator, increase service area.
Accompanying drawing explanation
Fig. 1 is the structural representation of traditional jet aerator;
Fig. 2 is the structural representation of existing Self-Suction Self-Excited Oscillation Pulsed Jet Aerator;
Fig. 3 is the structural representation of Gas feeding self-excited oscillation pulsed water jet aerator of the present invention;
Fig. 4 is the sectional view of Fig. 3;
In figure, 1--conical nozzle, 2--induction chamber, 3--trunnion, 4--expansion section, 5--tail pipe, 6--fluid drives nozzle, 7-air suction pipe, 8--mixing chamber, 9--self-sustained oscillation room, 10--impact walls, 11--diffuser tube, 12--intake antrum, 13--nozzle, 14--gas inlet, 15--suction muffler, 16--the self-excited oscillation cavity, 17--diffusion chamber, 18--housing, 19--the self-excited oscillation cavity entrance trunnion, 20--the self-excited oscillation cavity outlet trunnion;
D--nozzle outlet diameter, dL--intake antrum diameter, dg--air inlet diameter, d1--the self-excited oscillation cavity inlet diameter, d2--the self-excited oscillation cavity exit diameter, DT--the self-excited oscillation cavity diameter, L--the self-excited oscillation cavity entrance is to exporting distance, L1--jet exit is to the distance of the self-excited oscillation cavity entrance trunnion entrance, L2--the self-excited oscillation cavity entrance length of throat, L3--the self-excited oscillation cavity outlet length of throat, L4--diffusion chamber length, L5--gas inlet axis place is to the distance of the self-excited oscillation cavity entrance trunnion entrance, α--suction muffler exit cone angle, β--the self-excited oscillation cavity exit cone angle, θ--diffusion chamber cone angle.
Embodiment
Below in conjunction with the drawings and specific embodiments, the present invention is described in further detail.
As shown in Figure 3, Figure 4, a kind of Gas feeding self-excited oscillation pulsed water jet aerator, comprise housing 18, intake antrum 12, nozzle 13, suction muffler 15, the self-excited oscillation cavity entrance trunnion 19, the self-excited oscillation cavity 16, the self-excited oscillation cavity outlet trunnion 20 and diffusion chamber 17 is disposed with in housing 18, from a side end face of housing 18 to opposite side end face, the entrance of described intake antrum 12 is arranged on a side end face of housing 18, and the outlet of intake antrum 12 is connected with the entrance of nozzle 13, the outlet of nozzle 13 is connected with the entrance of suction muffler 15, and the outlet of suction muffler 15 is connected with the entrance of the self-excited oscillation cavity 16 through the self-excited oscillation cavity entrance trunnion 19, the outlet of the self-excited oscillation cavity 16 is connected with the entrance of diffusion chamber 17 through the self-excited oscillation cavity outlet trunnion 20, and the outlet of diffusion chamber 17 is arranged on the opposite side end face of housing 18, housing 18 sidewall is provided with gas inlet 14, and gas inlet 14 is connected with suction muffler 15, described the self-excited oscillation cavity inlet diameter d1 and nozzle outlet diameter d ratio are 1.2, described the self-excited oscillation cavity exit diameter d2 and nozzle outlet diameter d ratio are 1.3, described the self-excited oscillation cavity entrance is 2.8 to outlet distance L and nozzle outlet diameter d ratio, described the self-excited oscillation cavity diameter DT and nozzle outlet diameter d ratio are 6, described the self-excited oscillation cavity entrance length of throat L2 and nozzle outlet diameter d ratio are 1.5, described the self-excited oscillation cavity outlet length of throat L3 and nozzle outlet diameter d ratio are 1.6, described the self-excited oscillation cavity exit cone angle beta is 110 °, by the pulsation storing energy of jet boundary in this self-excited oscillation cavity 16, fluid is made to produce periodically pulsing, ripple frequency f relational expression is:
in formula, a is local velocity of sound, and unit is m/s, A is that nozzle inlet section amasss, and unit is m
2, V is nozzle chamber volume, and unit is m
3, l be the self-excited oscillation cavity entrance to exporting distance, unit is m, described intake antrum diameter d L and nozzle outlet diameter d ratio are 1.2, described air inlet diameter dg and nozzle outlet diameter d ratio are 2, described jet exit is 1.5 to the distance L1 of the self-excited oscillation cavity entrance trunnion entrance and nozzle outlet diameter d ratio, described diffusion chamber length L4 and nozzle outlet diameter d ratio are 3.0, described gas inlet axis place is 2.0 to the distance L5 of the self-excited oscillation cavity entrance trunnion entrance and nozzle outlet diameter d ratio, described suction muffler exit cone angle is 60 °, and described diffusion chamber taper angle theta is 6 °, described nozzle 13 for inner chamber be circular arc shrink nozzle 13, nozzle outlet diameter d is of a size of 20, so as to reduce fluid through nozzle 13 drag losses and avoid nozzle 13 to block.
Described housing 18 is cylindrical, so that in-site installation.
Below in conjunction with accompanying drawing, a use procedure of the present invention is described:
As shown in Figure 3, Figure 4, before using, gas inlet 14 of the present invention is connected with Fan pipeline, by gas blower air feed, oxygen-supplying amount can be adjusted as required, improve equipment coefficient of oxygen utilization and dynamic efficiency; Intake antrum 12 is connected with waste pipe, is driven by impeller pump.The inlet pressure of intake antrum 12 of the present invention is 0.1 ~ 0.2MPa(gauge pressure), gas inlet 14 pressure is 0.05 ~ 0.15MPa(gauge pressure).
Sewage enters into nozzle 13 through the entrance of intake antrum 12 and forms jet, the air provided by gas blower enters into suction muffler 15 from gas inlet 14, jet carries the air near jet in suction muffler 15 and enters the self-excited oscillation cavity 16, and suction muffler 15 forms low pressure area, the barotropic gas at gas inlet 14 place supplements into suction muffler 15; In the self-excited oscillation cavity 16, gas-liquid two-phase exchanges fast under violent self-sustained oscillation effect, and aerobic water body, in self-sustained oscillation shear field, violent turbulent fluctuation and shearing occurs, and gas-liquid has carried out sufficient mixing, bubble is sheared less simultaneously, form μm level bubble; Well-mixed gas-liquid two-phase sprays through diffusion chamber 17 in the form of a pulse with the form of micro-bubble, reduce the possibility of bubble coalescence, micro-bubble extends the time stopped in water simultaneously, namely the mass transfer time is extended, improve the transfer efficiency of oxygen, through reality test, oxygen transfer efficiency can reach more than 37%.
Under the Involving velocity of the self-excited oscillation cavity 16 inlet jet, by the pulsation storing energy of jet boundary in the self-excited oscillation cavity 16 of the present invention, make fluid produce periodically pulsing, ripple frequency f relational expression is:
In formula, a is local velocity of sound, and unit is m/s; A is that nozzle inlet section amasss, and unit is m
2; V is nozzle chamber volume, and unit is m
3; L be the self-excited oscillation cavity entrance to exporting distance, unit is m.
Claims (1)
1. a Gas feeding self-excited oscillation pulsed water jet aerator, it is characterized in that comprising housing, intake antrum, nozzle, suction muffler, the self-excited oscillation cavity entrance trunnion, the self-excited oscillation cavity, the self-excited oscillation cavity outlet trunnion and diffusion chamber is disposed with in housing, from a side end face of housing to opposite side end face, the entrance of described intake antrum is arranged on a side end face of housing, and the outlet of intake antrum is connected with the entrance of nozzle, the outlet of nozzle is connected with the entrance of suction muffler, and the outlet of suction muffler is connected with the entrance of the self-excited oscillation cavity through the self-excited oscillation cavity entrance trunnion, the outlet of the self-excited oscillation cavity is connected with the entrance of diffusion chamber through the self-excited oscillation cavity outlet trunnion, and the outlet of diffusion chamber is arranged on the opposite side end face of housing, housing sidewall is provided with gas inlet, and gas inlet is connected with suction muffler, described the self-excited oscillation cavity inlet diameter and nozzle outlet diameter proportional range are 1.2 ~ 1.4, described the self-excited oscillation cavity exit diameter and nozzle outlet diameter proportional range are 1.3 ~ 1.6, described the self-excited oscillation cavity entrance is 2.8 ~ 3.0 to outlet distance with nozzle outlet diameter proportional range, described the self-excited oscillation cavity diameter and nozzle outlet diameter proportional range are 6 ~ 8, described the self-excited oscillation cavity entrance length of throat and nozzle outlet diameter proportional range are 1.4 ~ 1.7, described the self-excited oscillation cavity outlet length of throat and nozzle outlet diameter proportional range are 1.5 ~ 1.8, described the self-excited oscillation cavity exit cone angle scope is 110 ° ~ 120 °, by the pulsation storing energy of jet boundary in this self-excited oscillation cavity, fluid is made to produce periodically pulsing, ripple frequency f relational expression is:
in formula, a is local velocity of sound, and unit is m/s, A is that nozzle inlet section amasss, and unit is m
2, V is nozzle chamber volume, and unit is m
3, l be the self-excited oscillation cavity entrance to exporting distance, unit is m, described intake antrum diameter and nozzle outlet diameter proportional range are 1.2 ~ 1.4, described air inlet diameter and nozzle outlet diameter proportional range are 2 ~ 3, described jet exit is 1.5 ~ 2.0 to the distance of the self-excited oscillation cavity entrance trunnion entrance and nozzle outlet diameter proportional range, described diffusion chamber length and nozzle outlet diameter proportional range are 2.0 ~ 4.0, described gas inlet axis place is 2.0 ~ 3.0 to the distance of the self-excited oscillation cavity entrance trunnion entrance and nozzle outlet diameter proportional range, described suction muffler exit cone angle scope is 50 ° ~ 70 °, described diffusion chamber cone angle scope is 4 ° ~ 7 °, described nozzle is inner chamber is the nozzle that circular arc is shunk, and the size range of nozzle outlet diameter is 20 ~ 40mm, and described housing is cylindrical.
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