CN207025118U - A kind of centrifugal dehydrator helix tube blender - Google Patents

Abstract

A spiral tube mixer for a centrifugal dehydrator, comprising a feed inlet, a pipe body, a spiral mixer and a discharge port; the feed inlet and the discharge port are respectively arranged at both ends of the pipe body, and the spiral mixer is arranged in the pipe body; The pipe body includes a feed section, a spiral mixing turbulent flow section, a turbulent water outlet section, a pipe diameter expanding section and a laminar flow section, and the end of the turbulent water outlet section is provided with an arc-shaped pipe wall with two symmetrical ends. The purpose of this utility model is to propose a centrifugal dehydrator spiral tube mixer, through a series of pipeline structure design and transformation, to a certain extent improve the use efficiency of the centrifugal dehydrator cavity.

Description

A spiral tube mixer for a centrifugal dehydrator

technical field

The utility model relates to the technical field of sludge treatment, in particular to a spiral tube mixer for a centrifugal dehydrator.

Background technique

In the sludge dewatering process, the excess sludge needs to be fully mixed with PAM (polyacrylamide) for pretreatment before entering the centrifugal dehydrator, so that the mixture has a certain degree of mud-water separation effect. Affected by the water quality characteristics of landfill leachate and the short-range nitrification treatment process of the biochemical system, the concentration of extracellular polymeric substances (EPS) in the remaining sludge is much higher than that of general municipal sludge, resulting in higher viscosity and poor flow and mixing characteristics. On the other hand, PAM is a high-molecular polymer, and 0.1-0.4% PAM aqueous solution is a non-Newtonian fluid, while the remaining sludge and PAM aqueous solution in the leachate treatment process are more harsh on the conditions of the mixing process.

There are two main types of existing technologies:

One is an ordinary tubular mixer, which is initially mixed in a pipeline with a slow flow rate of the mixture. The fluid is in a laminar flow state, and a stable protective layer will be formed at the contact interface of the two media, passing through the pipeline at different flow velocities. , and the mutual interference is very small, there is only phase interface friction caused by the difference in viscosity, the two fluids are difficult to mix fully, and the materials that have not been fully mixed directly enter the centrifugal dehydrator, resulting in low mud production efficiency and frequent mud running. ;

The second is a fully mixed-flow tubular reactor. The two fluids enter the mixing pipe at a relatively large initial flow rate to form turbulent flow. The advantage is that the mixing is relatively sufficient and the pipeline flux is large. The disadvantage is that it destroys the effects of adsorption bridging and sediment net capture. The steady-state structure affects the electrical neutralization of the cationic PAM aqueous solution and the negatively charged bacterial micelles in the excess sludge, which greatly affects the flocculation effect of PAM, making the supernatant of the centrifugal dehydrator turbid and with a high solid content. The mud is finely broken and not shaped, so the use efficiency of PAM is low, which increases the consumption of PAM per ton of mud. System power consumption.

Utility model content

The purpose of this utility model is to solve the above problems, and propose a centrifugal dehydrator spiral tube mixer, through a series of pipeline structure design and transformation, to a certain extent, improve the use efficiency of the centrifugal dehydrator cavity.

In order to achieve this purpose, the utility model adopts the following technical solutions:

A spiral tube mixer for a centrifugal dehydrator, comprising a feed inlet, a pipe body, a spiral mixer and a discharge port;

The feed inlet and the discharge outlet are respectively arranged at both ends of the pipe body, and the spiral mixer is arranged in the pipe body;

The pipe body includes a feed section, a spiral mixing turbulent section, a turbulent water outlet section, a pipe diameter expansion section and a laminar flow section, the feed section, the spiral mixing turbulent section, the turbulent water outlet section, the pipe The enlarged diameter section and the laminar flow section are sequentially connected, and the end of the turbulent water outlet section is provided with an arc-shaped pipe wall that is symmetrical at both ends;

The spiral mixer is arranged inside the spiral mixing turbulent section.

More preferably, there are four helical mixing turbulent sections, four helical mixers, and the four helical mixers are respectively arranged inside the four helical mixing turbulent sections.

More preferably, the turbulent water outlet section includes a first turbulent water outlet section, a second turbulent water outlet section and a third turbulent water outlet section, the first turbulent water outlet section, the second turbulent water outlet section and the third turbulent water outlet section The segments are interlaced with the four helical mixing turbulent segments.

More preferably, a pipeline sampling device is also provided, and the pipeline sampling device includes a first pipeline sampler and a second pipeline sampler;

The first pipeline sampler is arranged at the lower part of the second turbulent water outlet section;

The second pipe sampler is arranged at the front end of the pipe diameter enlarged section.

More preferably, it also includes a feeding port of a dosing pump, and the feeding port of the dosing pump is arranged at one end of the feeding section.

More preferably, a throttling valve is also included, and the throttling valve is arranged between the spiral mixing turbulent flow section and the pipe diameter expanding section.

More preferably, the pipe diameter of the feed section is larger than the pipe diameter of the spiral mixing turbulent flow section.

More preferably, the pipe diameter of the turbulent water outlet section gradually becomes larger.

More preferably, the pipe diameter of the laminar flow section is larger than the pipe diameter of the feed section.

More preferably, the pipe body is made of stainless steel.

The beneficial effects of the utility model:

1. Through the design and transformation of the pipeline structure, the rheological characteristics of the mixed fluid are controlled, and the turbulent flow is fully mixed and the laminar flow is promoted to flocculate. The easy-to-flow and easy-to-separate mixture of the end supernatant enveloping the sludge group greatly reduces the accumulation of self-aggregation and wall-hanging of the mixture in the centrifugal dehydrator, reduces the frequency of equipment maintenance, and improves the efficiency of the dehydration chamber of the centrifuge to a certain extent. Use efficiency.

2. The two types of media to be mixed are both non-Newtonian fluids with different rheological properties and high viscosity. It is difficult to achieve sufficient mixing by simple high-speed spiral stirring and mixing. Gentle and continuous stirring promotes the mass transfer of the two types of media and reduces the consumption of PAM per ton of sludge.

3. The structure of the arc-shaped pipe wall at the end of the turbulent water outlet section makes the mixed fluid form a local countercurrent and anti-mixing before entering the next spiral mixer, breaking the stable protective layer formed by the contact interface of the two media, and strengthening the eddy current diffusion.

4. The flocculation of PAM in the laminar flow section at the back end creates hydraulic conditions and residence time, strengthens the bridging adsorption of PAM and the role of sediment net capture, and fully exerts its pre-mixed mud-water separation effect, so that the mixture enters the centrifugal dehydrator A certain degree of solid-liquid separation has been achieved before, which greatly increases the dehydration efficiency of the centrifugal dehydrator.

5. Set the pipeline sampler and throttle valve to sample and analyze the mixing degree of the fluid in the pipeline mixer without shutting down the machine, and make corresponding parameters such as sludge and flocculant feed flow rate, mixed fluid flow rate and pressure. Adjustment.

Description of drawings

Fig. 1 is the schematic diagram of an embodiment of the utility model;

Among them: 1 is the pipe body; 11 is the feeding section; 12 is the spiral mixing turbulent section; 13 is the turbulent water outlet section; 131 is the arc-shaped pipe wall; 132 is the first turbulent water outlet section; 133 is the second turbulent water outlet section; 134 14 is the diameter expansion section; 15 is the laminar flow section; 2 is the inlet; 3 is the spiral mixer; 4 is the outlet; 5 is the pipeline sampling device; 51 is the first pipeline Sampler; 52 is the second pipeline sampler; 6 is the feeding port of the dosing pump; 7 is the throttle valve.

detailed description

The technical solution of the present utility model will be further described below in conjunction with the accompanying drawings and through specific embodiments.

A spiral tube mixer for a centrifugal dehydrator, comprising a feed port 2, a tube body 1, a spiral mixer 3 and a discharge port 4; the feed port 2 and the discharge port 4 are respectively arranged on the tube body 1, the spiral mixer 3 is arranged in the pipe body 1; the pipe body 1 includes a feed section 11, a spiral mixing turbulent section 12, a turbulent water outlet section 13, a pipe diameter expanding section 14 and a laminar flow The flow section 15, the feed section 11, the spiral mixing turbulent section 12, the turbulent water outlet section 13, the pipe diameter expansion section 14 and the laminar flow section 15 are sequentially connected, and the turbulent water outlet section The end of 13 is provided with an arc-shaped tube wall 131 with both ends symmetrical; the spiral mixer 3 is arranged inside the spiral mixing turbulent section 12 .

As shown in Figure 1, the pipe diameter of the spiral mixing turbulence section 12 in an embodiment of the present invention is 0.75 times of the pipe diameter of the feed section 11, and the length of the spiral mixer 3 is 1.2 meters, so that The Reynolds number of the helical mixing turbulence section 12 reaches more than 4500, and makes the mixed fluid form local turbulent flow near the helical blades of the helical mixer 3 to achieve the purpose of enhancing mixing and mass transfer efficiency. The junction of the end of the turbulent flow section 13 and the next spiral mixing turbulent section 12 adopts the arc-shaped pipe wall 131, and the arc-shaped pipe wall 131 is tangent to the end of the turbulent flow section 13, so The bending radius of the arc-shaped pipe wall 131 is 0.6 times of the pipe diameter of the spiral mixing turbulence section 12, forming a local countercurrent and anti-mixing before the mixed fluid enters the next section, breaking the stable protective layer formed by the contact interface of the two media, strengthening the Vortex diffusion. The pipe diameter enlarged section 14 is connected with the laminar flow section 15, and the length of the pipe diameter enlarged section 14 is 4 times of the pipe diameter of the spiral mixing turbulent flow section 12, so as to avoid the local resistance disturbance and pipeline caused by sudden expansion. Dead angle, the rear end of the pipe diameter expansion section 14 is connected to the laminar flow section 15, and the pipe diameter of the laminar flow section 15 is twice the pipe diameter of the spiral mixing turbulent flow section 12, reaching the point where the flow velocity drops The purpose is to reduce the Reynolds number from 3700 to 3900 to 1600 to 1900, so that the mixed fluid gradually transitions from turbulent flow to laminar flow, forming a plug flow pretreatment reactor, and creating hydraulic conditions and residence time for PAM flocculation.

Further description, the spiral mixing turbulent section 12 is provided with four, the spiral mixer 3 is provided with four, and the four spiral mixers 3 are respectively arranged inside the four spiral mixing turbulent sections 12 . As shown in FIG. 1 , in this example, four said helical mixers 3 are connected in series in four said helical mixing turbulent sections 12 , so that the mixed fluid can be fully mixed and the working efficiency is improved.

To further illustrate, the turbulent water outlet section 13 includes a first turbulent water outlet section 132, a second turbulent water outlet section 133 and a third turbulent water outlet section 134, the first turbulent water outlet section 132, the second turbulent water outlet section 133 And the third turbulent flow section 134 is connected with the four spiral mixing turbulent sections 12 alternately. In this example, three turbulent water outlet sections 13 are added between the four spiral mixing turbulent flow sections 12, and the three turbulent water outlet sections 13 are respectively the first turbulent water outlet section 132 and the second turbulent water outlet section 132. The lengths of the water outlet section 133 and the third turbulent water outlet section 134 , the first turbulent water outlet section 132 , the second turbulent water outlet section 133 and the third turbulent water outlet section 134 are all 0.8 meters.

To further illustrate, a pipeline sampling device 5 is also provided, and the pipeline sampling device 5 includes a first pipeline sampler 51 and a second pipeline sampler 52; The lower part of section 133 ; the second pipe sampler 52 is arranged at the front end of the pipe diameter expanding section 14 . As shown in Figure 1, in the present embodiment, the first pipeline sampler 51 and the second pipeline sampler 52 are respectively arranged at the front ends of the second turbulent water outlet section 133 and the pipe diameter expansion section 14, so that The first pipeline sampler 51 and the second pipeline sampler 52 are manual switches, and the pipeline sampling device 5 samples and analyzes the fluid mixing degree in the spiral tube mixer of the centrifugal dehydrator, and analyzes the sludge and flocculation The feed flow rate of the agent is adjusted accordingly to ensure that the fluid is fully mixed at the second pipeline sampler 52. If the fluid is fully mixed at the first pipeline sampler 51, an overrun connection can be made to directly enter the pipeline. Diameter expansion section 14.

For further description, it also includes a feeding port 6 of the dosing pump, which is arranged at one end of the feeding section 11 .

For further description, a throttle valve 7 is also included, and the throttle valve 7 is arranged between the spiral mixing turbulent flow section 12 and the pipe diameter enlarged section 14 . In this example, a throttle valve 7 is provided between the spiral mixing turbulent flow section 12 and the pipe diameter enlarged section 14 , and the throttle valve 7 regulates the flow rate and pressure of the mixed fluid entering the pipe diameter enlarged section 14 .

To further illustrate, the pipe diameter of the feed section 11 is larger than the pipe diameter of the spiral mixing turbulent flow section 12 .

To further illustrate, the pipe diameter of the turbulent water outlet section 13 gradually becomes larger. In this example, the pipe diameter of the turbulent water outlet section 13 gradually increases to 1.3 times the pipe diameter of the spiral mixing turbulent flow section 12, and the pipe diameter gradually increases to avoid sudden expansion of local resistance and pipeline dead ends. The turbulent water outlet section The widest part of 13 is 1.3 times of the spiral mixing turbulence section 12, so that the flow velocity of the mixed fluid is reduced, and the Reynolds number of the mixed fluid is reduced to 3200-3500, which means that the mixed fluid is in a transitional flow state.

To further illustrate, the pipe diameter of the laminar flow section 15 is larger than the pipe diameter of the feed section 11 .

To further illustrate, the pipe body 2 is made of stainless steel.

The technical principles of the present utility model have been described above in conjunction with specific embodiments. These descriptions are only for explaining the principle of the utility model, and cannot be construed as limiting the protection scope of the utility model in any way. Based on the explanations herein, those skilled in the art can think of other specific implementations of the present utility model without creative work, and these forms will all fall within the protection scope of the present utility model.

Claims (10)

1. A spiral tube mixer for a centrifugal dehydrator, characterized in that: it comprises a feed inlet, a pipe body, a spiral mixer and a discharge port; The feed inlet and the discharge outlet are respectively arranged at both ends of the pipe body, and the spiral mixer is arranged in the pipe body; The pipe body includes a feed section, a spiral mixing turbulent section, a turbulent water outlet section, a pipe diameter expansion section and a laminar flow section, the feed section, the spiral mixing turbulent section, the turbulent water outlet section, the pipe The enlarged diameter section and the laminar flow section are sequentially connected, and the end of the turbulent water outlet section is provided with an arc-shaped pipe wall that is symmetrical at both ends; The spiral mixer is arranged inside the spiral mixing turbulent section. 2. A centrifugal dehydrator spiral tube mixer according to claim 1, characterized in that: there are four spiral mixing turbulence sections, four spiral mixers, four spiral mixing The devices are respectively arranged inside the four spiral mixing turbulent sections. 3. A spiral tube mixer for centrifugal dehydrator according to claim 2, characterized in that: the turbulent water outlet section includes a first turbulent water outlet section, a second turbulent water outlet section and a third turbulent water outlet section, the first turbulent water outlet section A turbulent water outlet section, the second turbulent water outlet section and the third turbulent water outlet section are connected with the four helical mixing turbulent flow sections alternately. 4. A centrifugal dehydrator spiral tube mixer according to claim 3, characterized in that: a pipeline sampling device is also provided, and the pipeline sampling device comprises a first pipeline sampler and a second pipeline sampler; The first pipeline sampler is arranged at the lower part of the second turbulent water outlet section; The second pipe sampler is arranged at the front end of the pipe diameter enlarged section. 5 . The spiral tube mixer for a centrifugal dehydrator according to claim 1 , further comprising a feeding port of a dosing pump, and the feeding port of the dosing pump is arranged at one end of the feeding section. 6 . 6. A spiral tube mixer for a centrifugal dehydrator according to claim 1, further comprising a throttle valve, the throttle valve is arranged between the spiral mixing turbulent flow section and the pipe diameter expansion section between. 7. A spiral tube mixer for a centrifugal dehydrator according to claim 1, characterized in that: the diameter of the feed section is larger than the diameter of the spiral mixing turbulent flow section. 8. A spiral tube mixer for centrifugal dehydrator according to claim 1, characterized in that: the tube diameter of the turbulent water outlet section gradually increases. 9. A spiral tube mixer for a centrifugal dehydrator according to claim 1, characterized in that: the tube diameter of the laminar flow section is larger than the tube diameter of the feed section. 10. A centrifugal dehydrator spiral tube mixer according to claim 1, characterized in that: the tube body is made of stainless steel.