CN100430326C - Self-excited oscillating pipeline flocculator - Google Patents

Abstract

A self-excited oscillating pipeline-type flocculator relates to a pipeline-type flocculator for water treatment, which is used in operations such as flocculation, sedimentation, and flotation in water supply, industrial wastewater or urban domestic sewage treatment projects. The invention comprises a water nozzle, a mixing chamber, an upper nozzle body, a self-excited oscillation chamber, a lower nozzle body, and connecting pipes which are sequentially sealed and fixedly connected, a dosing tank, a flow regulating valve and a flocculant solution delivery pipe which are sequentially sealed and fixedly connected, and the flocculation The outlet hole end of the agent delivery pipe is fixedly communicated with the mixing chamber. The invention effectively improves the bridging and adsorption effect of the flocculant particles on the colloid particles, and improves the flocculation efficiency. The pressure amplitude of the pulse flow is 15-30% higher than the pressure of the incoming flow without any additional auxiliary devices, which can replace the traditional process procedures such as dosing, stirring, and mixing adjustment. The flocculation effect is good and energy consumption is saved. Reduce the cost of civil engineering and improve the economic indicators of water treatment.

Description

Self-excited oscillating pipeline flocculator

Technical field:

The invention relates to a pipeline type flocculator for water treatment, which is used in operations such as flocculation, sedimentation and flotation in the treatment engineering of water supply, industrial waste water or urban domestic sewage.

Background technique:

Flocculation plays an important role in water supply and wastewater treatment and has been widely used. It is the basis of sedimentation, flotation and other treatments. The traditional flocculation method usually requires a mechanical stirring device to mix the flocculant evenly in the adjustment tank, and the required flocculation time is as long as 20-30min, or even longer, with high energy consumption and low utilization efficiency. Therefore, the study of high-speed and high-efficiency in the flocculation stage has always been a subject of concern. On the other hand, the unitization, pipelineization and serialization of environmental protection equipment have become the current development trend.

Sun Zhe (Experimental Research on the Mechanism of New Swirl-Grid Coagulation Reaction, "Water Supply and Drainage", 1994.7) believes that the swirling water flow in the pipeline provides conditions for the contact and collision of different condensed particles, making the flocculated particles dense, which is in Initial flocculation is extremely necessary. Its design idea is to let the treated water mixed with flocculant flow into the circular tube step by step, and produce continuous rotation in the same direction, which will make the water flow form an orderly vortex. However, this method of generating a rotating jet has a large pressure loss, and the mixing effect is not as high as that of a mechanical stirring method.

Li Mingjun (Research progress and analysis of pipeline flow flocculation, "Water Treatment Technology" 1997.23 (2)) evaluated the influence of relevant parameters on flocculation residence time and flocculation effect from flocculation kinetics and stirring intensity. He believes that it is possible to complete the whole process of flocculation in a section of pipeline. Since the formation of microflocs is closely related to hydrodynamic factors (micro-vortex scale, etc.) The number of collisions and the appropriate collision energy will become important factors for the coagulation and growth of microflocs, and they are also important factors for seeking high-efficiency flocculation in engineering applications. This is also the problem that the pipeline flocculator needs to solve.

Hu Wanli ("Coagulation · Coagulant · Coagulation Equipment", Chemical Industry Press, 2001) said that the dosage of flocculants can be divided into two types: dry throwing and wet throwing. Dry throwing refers to putting the solid flocculant directly into the treated water or waste water without dissolving. Wet throwing means that the flocculant is made into an aqueous solution first, and then used for water or wastewater treatment. There is no conclusion about the optimal working solution concentration of flocculant. Generally speaking, it is better to put aluminum sulfate in the form of dilute solution, and it is better to put ferric chloride in the form of dry throw or concentrated solution.

In addition, Hu Wanli also introduced several automatic dosing devices that have been developed and used: Shanghai Water Supply Company uses inclined pipes to simulate the sedimentation effect to automatically control the dosing amount according to the influent flow rate; the water plant of Shanghai Petrochemical General Plant uses raw water Water quality (turbidity, temperature, pH value, etc.) and water quality after precipitation establish a mathematical model for automatic dosing; Harbin Institute of Technology and other units automatically adjust the dosing amount according to the raw water ξ potential value after dosing. Its working principle is generally to output the analog current signal from the raw water flow transmitter, automatically control the dosing amount according to the change of raw water flow and turbidity, or adjust the dosing amount according to the turbidity of the effluent, that is, through the mathematical model of turbidity deviation, to The current signal drives the regulating valve to change the dosing amount.

At present, there are not many literatures on pipeline flocculation research at home and abroad, and there is no introduction of a more systematic and perfect pipeline flocculator.

Utility model patent No. 89201391.5, its name is "oscillating pulse jet nozzle for roller cone bit". The nozzle is composed of upper and lower nozzle bodies. The upper nozzle body is composed of three parts: the diversion port, the upper nozzle and the self-excited oscillation chamber. The shape of the upper nozzle body is a stepped cylinder, and the nozzle flow channel in the cylinder Composed of two exponential curved surfaces and three cylindrical surfaces, the upper part of the lower nozzle body is a curved conical surface, the lower part is stepped cylindrical, and the inner flow channel hole of the lower nozzle body is a cylindrical hole.

Invention content:

The object of the present invention is to provide a self-excited oscillation pipeline type flocculator. Without any auxiliary device, the flocculator relies on the strong shearing effect of the self-excited oscillation cavity on the flocculant solution and water, so that the flocculant solution and water are fully mixed in the pipeline flocculator, and then pulsed It is sprayed in the form of a jet, the pressure loss of the pipeline flocculator is small, and the turbulent hydraulic conditions of flocculation are effectively improved, the flocculation efficiency is improved, and the flow rate of the flocculant solution is adjusted and controlled according to the dosage.

In order to realize the object of the above invention, the present invention adopts the design principle of "the oscillating pulse jet nozzle for the roller cone bit". The flocculator includes a water nozzle, a mixing chamber, an upper nozzle body, a self-excited oscillation chamber, a lower nozzle body, a connecting pipe, a dosing tank, a flow regulating valve and a flocculant solution delivery pipe. There is a circular hole and a cone in the water nozzle. The through hole is composed of a cone hole with an angle of 12-14°. The shape of the cone hole end of the water nozzle is a truncated cone with a cone angle of 25-35°. The mixing chamber is a cylinder. There is an opening hole in the mixing chamber. There is a hole on the front end face of the mixing chamber that communicates with the opening hole in the mixing chamber, and the water nozzle is sealed and fixedly connected with the hole on the front end face of the mixing chamber. The rotary cavity formed by the one-dimensional high-order equation has an outlet hole in the rear end of the upper nozzle body that communicates with the rotary cavity in the front end of the upper nozzle body. The upper nozzle body is sealed and fixedly connected with the mixing cavity to form a mixing cavity. The water nozzle The frustum-shaped end of the water nozzle is located in the mixing chamber, the outlet diameter of the water nozzle is d, the distance between the frustum-shaped end face of the water nozzle and the front end face of the outlet hole of the upper nozzle body is (0.5-2.5)d, and the outlet hole of the upper nozzle body The ratio of the diameter D to the diameter d of the outlet hole of the water nozzle is 1.4-1.8. After 1-3 self-excited oscillation cavities, all of which are cylinders, are connected with the coaxial seal in sequence, the inlet hole end of the front end and the upper nozzle body The outlet holes are sealed, fixedly connected and communicated. In these self-excited oscillation cavities, there are revolving cavities whose busbar is a straight line or an exponential curve. Each of the end faces has a cone angle of 100-120° and is located in the rear end of the rotary cavity of the previous self-excited oscillation cavity. The lower nozzle body is a cylinder, and the front end of the lower nozzle body has a cone. The frustum-shaped collision wall with an angle of 100-120°, the lower nozzle body has a through hole composed of a circular hole and a diffusion hole, the inner diameter of the circular hole in the lower nozzle body is (1.1-3)D, the length is (0.5-3)D, and the diffusion The full angle of the hole is 12-14°. The frustum-shaped collision wall of the lower nozzle body is located in the rear end of the rotary cavity in the self-excited oscillation cavity at the end and is sealed and fixedly connected. The entrance of the rotary cavity in each self-excited oscillation cavity is connected to the The distance between the end face of the entrance hole of the frustum-shaped collision wall in the rear end of the rotary cavity in the self-excited oscillation cavity is (2.2-3)D, and the inner wall of the rotary cavity in each self-excited oscillation cavity and the self-excited oscillation The diameter of the contact point of the frustum-shaped collision wall in the rear end of the rotary cavity in the cavity is (2.5-8.8) D, the outlet hole end of the lower nozzle body is sealed and fixedly connected with the inlet hole end of the nozzle body, the dosing tank, flow adjustment After the valve and the flocculant solution delivery pipe are sequentially sealed and fixedly connected, the outlet hole end of the flocculant delivery pipe is fixedly communicated with the mixing chamber.

The present invention achieves the purpose of the invention in this way: the jet is ejected from the water nozzle, and negative pressure is generated in the mixing chamber, and the prepared flocculant solution is sucked into the mixing chamber through the delivery pipe, and enters the self-excited oscillation chamber through the upper nozzle body middle. According to the requirements of different working conditions, 1-3 self-excited oscillation cavities can be used to enhance the pulse intensity and improve the mixing efficiency. When the inflow reaches the lower nozzle body and interacts with the impingement wall within it, a pressure oscillation wave is generated in the impingement zone. The oscillating wave propagates upstream as sound wave, and induces new vorticity pulsation. When the pressure fluctuations in the separation zone and the collision zone are in opposite phases, a cyclic process of vorticity disturbance-amplification-new vorticity disturbance will be formed. Repeating this process continuously, a strong self-excited oscillation is formed in the self-excited oscillation cavity. Under the action of strong shear force, the water and flocculant solution are fully mixed and sprayed out through the lower nozzle body and the connecting pipe.

According to the flow and characteristics of the wastewater to be treated, the flow of the flocculant solution is controlled by a flow regulating valve. Before use, do a flocculation and sedimentation test of the treated water to determine which flocculant and dosage to use. Commonly used flocculants include basic aluminum chloride, ferric sulfate, ferrous sulfate, aluminum sulfate, and polyacrylamide. The flocculation agent is configured into a solution of 1g/L to 10g/L and stored in a dosing tank. Then adjust the flow control valve according to the designed flow rate and dosage of the flocculator to ensure that the flocculant is added evenly during the water flow process to ensure the flocculation effect.

The present invention has the following technical effects:

The flocculator not only greatly improves the mixing condition of the flocculant solution and the inflow, but also enhances the turbulence of the inflow, effectively improves the bridging and adsorption of the flocculant particles to the colloid particles, and improves the flocculation efficiency. Without any additional auxiliary devices, depending on the special shape and specific boundary conditions of the upper nozzle body, the self-excited oscillation chamber and the collision wall on the lower nozzle body, the flocculation solution and the inflow are in the self-excited oscillation chamber. Mix well and convert the continuous jet flow of the incoming flow into a pulsed flow whose pressure amplitude is 15-30% higher than the incoming flow pressure.

The use of this flocculator can replace traditional process procedures such as dosing, stirring, and mixing adjustment. The flocculation effect is good, energy consumption is saved, civil construction costs are reduced, and the economic indicators of water treatment are improved.

Description of drawings:

Fig. 1 is the assembly diagram of the self-excited oscillation pipeline type flocculator when using a single self-excited oscillation cavity;

Fig. 2 is the assembly diagram of the self-excited oscillation pipeline type flocculator when two self-excited oscillation chambers are connected in series;

In Figure 1 and Figure 2:

1-water nozzle; 2-mixing chamber; 3-upper nozzle body;

4-self-excited oscillation cavity; 4-1-self-excited oscillation cavity; 4-2-self-excited oscillation cavity

5-lower nozzle body; 6-connector; 7-dosing tank;

8-Flow regulating valve; 9-Flocculant delivery pipe; 10-Flange

Detailed ways:

In the attached drawing, the water nozzle, the mixing chamber, the upper nozzle body, the self-excited oscillation chamber and the lower nozzle body are installed on the same center line in sequence, and the dosing tank, the flow regulating valve and the flocculant delivery pipe are sealed and fixed in sequence. , the outlet hole end of the flocculant conveying pipe is fixedly communicated with the mixing chamber. The sealing and fixing can be connected by thread, welding or flange.

Water nozzle diameter d: $d=\sqrt{\frac{Q_{\mathrm{the\; s}}}{3.28\&times;{\mathrm{<figure-callout\; id="1"\; label="h"\; filenames="C20061005410400101.png,C20061005410400111.png"\; state="\{\{state\}\}">h</figure-callout>}}^{1/2}\&times;3600}}$

In the formula, Qs is the flow rate of the water pump, m ³ /h; H is the lift of the water pump, in meters of water column; d is the diameter of the water nozzle, in meters.

The cone angle of the cone hole in the water nozzle is 13°, the shape of the cone hole end of the water nozzle is a truncated cone with a cone angle of 30°, the mixing chamber is a cylinder, and there is a circular opening hole in the mixing chamber. There is a round hole on the end surface that communicates with the circular opening in the mixing chamber. The upper nozzle body is cylindrical. The front end of the upper nozzle body has a rotary cavity whose busbar is a quintic equation. There is a rear end of the upper nozzle body. The round hole communicates with the revolving cavity in the front end of the upper nozzle body, the diameter of the front end face of the revolving cavity is the same as the diameter of the circular opening hole of the mixing chamber, and the frustum-shaped end face of the water nozzle reaches the circular outlet of the upper nozzle body The distance between the front end of the hole is 2d, the ratio of the diameter D of the outlet hole of the upper nozzle body to the diameter d of the water nozzle is 1.5, a self-excited oscillation cavity is a cylinder, and the busbar in the self-excited oscillation cavity is a linear rotary through hole, and the lower There is a frustum-shaped collision wall with a cone angle of 110° on the front end surface of the nozzle body. The diameter of the circular hole in the lower nozzle body is 1.5D, the length is 2D, and the full angle of the diffusion hole in the lower nozzle body is 13°. The distance from the entrance end of the rotary through hole to the end face of the entrance hole of the frustum-shaped collision wall in the rear end of the rotary through hole in the self-excited oscillation cavity is 2.5D, and the inner wall of the rotary through hole in the self-excited oscillation cavity is in contact with the self-excited oscillation cavity. The diameter of the contact part of the frustum-shaped collision wall in the rear end of the rotary through hole in the oscillation cavity is 3D.

Between the upper and lower nozzle bodies, two self-excited oscillation chambers are fixedly connected with coaxial sealing in sequence. The bus bar in the first self-excited oscillation chamber is a linear rotary through hole, and the front end surface of the second self-excited oscillation chamber There is a frustum-shaped collision wall with a cone angle of 110° and located in the rear end of the rotary through hole in the first self-excited oscillation cavity, and the middle part of the frustum-shaped collision wall of the second self-excited oscillation cavity has a A circular hole with the same diameter as the circular hole communicates with the rotary through hole and the rotary hole in the front and rear self-excited oscillation chambers. The distances between the entrance hole and end face of the frustum-shaped collision wall in the rotary through hole and the rear end of the rotary hole are 2.5D and 3D respectively. The diameter of the contact part of the frustum-shaped collision wall in the through hole and the back end of the rotary hole is 4D.

Three self-excited oscillation cavities are sequentially coaxially sealed and fixedly connected between the upper and lower nozzle bodies. Each self-excited oscillation cavity has an exponential curve rotary cavity. The front end faces of the latter two self-excited oscillation cavities are respectively It is a frustum-shaped collision wall with a cone angle of 110° and is respectively located in the rear end of the rotary cavity of the previous self-excited oscillation cavity. The middle part of the front end of each self-excited oscillation cavity has a hole with the same diameter as the circular hole in the lower nozzle body. A circular hole, which communicates with the exponential curve rotary cavity in the front and rear self-excited oscillation cavities, and the frustum-shaped collision walls at the front ends of the second and third self-excited oscillation cavities are respectively located In the rear end of the rotary cavity with an exponential curve in the cavity, the distance between the inlet end of the rotary cavity in the first, second and third self-excited oscillation cavities to the end face of the entrance hole of the frustum-shaped collision wall in the corresponding rear end of the rotary cavity The distances are 2.5D, 3D, and 3D respectively, and the diameters of the contact points between the inner wall of the rotary cavity in the first, second, and third self-excited oscillation cavities and the frustum-shaped collision wall in the rear end of the corresponding rotary cavity are all 4D .

This pipe-type flocculator was used in the test of treating leather wastewater discharged by a leather production enterprise. According to the flocculation and sedimentation test, the flocculant is basic aluminum chloride, and the optimal dosage is 100mg/L. The flocculant is configured as a 1g/L solution, and the flocculant flow rate is adjusted according to the waste water flow rate to ensure that the flocculant is added evenly with the optimal dosage.

Claims (5)

1, a kind of self exciting oscillation pipeline type flocculating device, it is characterized in that this flocculator comprises water spouting nozzle, mixing chamber, the upper spray nozzle body, the self-sustained oscillation cavity, following nozzle body, take over, grug feeding jar, flow control valve and flocculant solution transfer lime, have one to be the through hole that 12-14 ° taper hole constitutes in the water spouting nozzle by circular hole and cone angle, the profile of the taper hole end of water spouting nozzle is that cone angle is 25-35 ° a truncated cone-shaped, mixed cavity is a cylinder, one open pore is arranged in the mixing chamber, on the front end end face of mixed cavity a hole that communicates with the intravital open pore in mixed chamber is arranged, hole on the front end end face of water spouting nozzle and mixing chamber is sealedly and fixedly connected, the upper spray nozzle body is a cylinder, it is the formed revolution cavity of the straight line or the monobasic equation of higher degree that bus is arranged in the front end of upper spray nozzle body, there is the interior revolution cavity of an outlet opening and upper spray nozzle body front end to communicate in the rear end of upper spray nozzle body, after being sealedly and fixedly connected, upper spray nozzle body and mixing chamber constitute hybrid chamber, the truncated cone-shaped end of water spouting nozzle is positioned at this hybrid chamber, the exit diameter of water spouting nozzle is d, the truncated cone-shaped end end face of water spouting nozzle is (0.5-2.5) d to the distance of the outlet opening front end end face of upper spray nozzle body, the outlet opening diameter D of upper spray nozzle body is 1.4-1.8 with the ratio of the outlet opening diameter d of water spouting nozzle, the self-sustained oscillation cavity that 1-3 is cylinder successively co-axial seal fixedly connected after, the inlet nose end of its front end is sealedly and fixedly connected and communicates with the outlet nose end of upper spray nozzle body, it is straight line or index curve revolution cavity that bus is all arranged in these self-sustained oscillation cavitys, the revolution cavity communicates with the revolution cavity, wherein, cone angle is respectively arranged on the front end end face of 2-3 self-sustained oscillation cavity is 100-120 ° and lay respectively at truncated cone-shaped impact walls in the revolution cavity rear end of previous self-sustained oscillation cavity, following nozzle body is a cylinder, it is 100-120 ° truncated cone-shaped impact walls that cone angle is arranged on the front end end face of following nozzle body, the through hole that has circular hole and diffusion hole to constitute in the following nozzle body, the circular hole internal diameter is (1.1-3) D in the following nozzle body, length is (0.5-3) D, the diffusion hole full-shape is 12-14 °, the truncated cone-shaped impact walls of following nozzle body is positioned at terminal the self-excited oscillation cavity intravital revolution cavity rear end and is sealedly and fixedly connected, and the intravital revolution cavity of each the self-excited oscillation cavity inlet end arrives ShouldThe distance of the inlet nose end end face of the truncated cone-shaped impact walls in the intravital revolution cavity of the self-excited oscillation cavity rear end is (2.2-3) D, the diameter of the contact position of the truncated cone-shaped impact walls in intravital revolution cavity inner wall of each the self-excited oscillation cavity and the intravital revolution cavity of this self-excited oscillation cavity rear end is (2.5-8.8) D, the outlet nose end of following nozzle body and the inlet nose end of adapter are sealedly and fixedly connected, after grug feeding jar, flow control valve and flocculant solution transfer lime were sealedly and fixedly connected successively, the outlet nose end of flocculation agent transfer lime fixedly was communicated with mixing chamber.

2, self exciting oscillation pipeline type flocculating device according to claim 1, the cone angle that it is characterized in that the taper hole in the water spouting nozzle is 13 °, the profile of the taper hole end of water spouting nozzle is that cone angle is 30 ° a truncated cone-shaped, mixing chamber is a right cylinder, one circular open hole is arranged in the mixing chamber, one circular hole that communicates with the intravital circular open of hybrid chamber hole is arranged on the front end end face of mixing chamber, the upper spray nozzle body is a right cylinder, it is the revolution cavity of monobasic quintic equation that bus is arranged in the front end of upper spray nozzle body, there is the interior revolution cavity of a circular hole and the front end of upper spray nozzle body to communicate in the rear end of upper spray nozzle body, the diameter of this revolution cavity front end end face is identical with the circular open bore dia of mixing chamber, the truncated cone-shaped end end face of water spouting nozzle is 2d to the front end distance in the round exit hole of upper spray nozzle body, the outlet opening diameter D of upper spray nozzle body is 1.5 with the ratio of water spouting nozzle diameter d, a self-sustained oscillation cavity is a right cylinder, it is the straight line gyration through hole that bus is arranged in this self-sustained oscillation cavity, it is 110 ° truncated cone-shaped impact walls that cone angle is arranged on the intravital front end end face of following nozzle, the diameter of the intravital circular hole of following nozzle is 1.5D, length is 2D, 13 ° of the intravital diffusion hole full-shapes of following nozzle, the intravital revolution through hole of this self-excited oscillation cavity inlet end is 2.5D to the distance of the inlet nose end end face of the interior truncated cone-shaped impact walls of the intravital revolution through hole back-end of this self-excited oscillation cavity, and the diameter of the contact position of the truncated cone-shaped impact walls in intravital revolution through-hole wall of the self-excited oscillation cavity and the intravital revolution through hole back-end of this self-excited oscillation cavity is 3D.

3, self exciting oscillation pipeline type flocculating device according to claim 1, it is characterized in that last, fixedly connected two self-sustained oscillation cavitys of co-axial seal successively between the following nozzle body, it is the straight line gyration through hole that bus is arranged in first self-sustained oscillation cavity, cone angle is arranged on the front end end face of second self-sustained oscillation cavity is 110 ° and be positioned at the truncated cone-shaped impact walls of the intravital revolution through hole back-end of first the self-excited oscillation cavity, the truncated cone-shaped impact walls of second self-sustained oscillation cavity middle part have one with the identical circular hole of the intravital Circularhole diameter of following nozzle, this circular hole with before, intravital revolution through hole of back the self-excited oscillation cavity and rotary hole communicate, first, two intravital revolution through holes of the self-excited oscillation cavity, the rotary hole inlet end is to this revolution through hole, the distance of the inlet nose end end face of the truncated cone-shaped impact walls in the rotary hole rear end is respectively 2.5D, 3D, first, revolution through hole in two self-sustained oscillation cavitys, the rotary hole inwall respectively with corresponding revolution through hole, the diameter of the contact position of the truncated cone-shaped impact walls in the rotary hole rear end is 4D.

4, self exciting oscillation pipeline type flocculating device according to claim 1, it is characterized in that last, fixedly connected three self-sustained oscillation cavitys of co-axial seal successively between the following nozzle body, an index curve revolution cavity is arranged in each self-sustained oscillation cavity, respectively the truncated cone-shaped impact walls in 110 ° of cone angles and the revolution cavity rear end that lays respectively at previous self-sustained oscillation cavity on the front end end face of two the self-sustained oscillation cavitys in back, the front center of each self-sustained oscillation cavity have one with the identical circular hole of the intravital Circularhole diameter of following nozzle, this circular hole with before, the intravital index curve revolution of back the self-excited oscillation cavity cavity communicates, second, the truncated cone-shaped impact walls of the front end of three self-sustained oscillation cavitys lays respectively at first, in two the intravital index curve revolution of the self-excited oscillation cavity cavity rear ends, first, two, the distance of the inlet nose end end face of three the intravital revolution cavity of the self-excited oscillation cavity inlet ends truncated cone-shaped impact walls in the corresponding revolution cavity rear end is respectively 2.5D, 3D, 3D, first, two, in three self-sustained oscillation cavitys the revolution cavity inner wall respectively with corresponding revolution cavity in the diameter of contact position of truncated cone-shaped impact walls in the rear end be 4D.

5, self exciting oscillation pipeline type flocculating device according to claim 1 is characterized in that water spouting nozzle, mixing chamber, upper spray nozzle body, a 1-3 self-sustained oscillation cavity, following nozzle body are installed on the same medullary ray.

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