CN215352170U

CN215352170U - Hydraulic cyclone radial-flow grit chamber

Info

Publication number: CN215352170U
Application number: CN202120559066.XU
Authority: CN
Inventors: 元绍建; 岳尚超; 唐凯峰; 董志虎
Original assignee: Tianjin Municipal Engineering Design and Research Institute
Current assignee: Tianjin Municipal Engineering Design and Research Institute
Priority date: 2021-03-18
Filing date: 2021-03-18
Publication date: 2021-12-31
Anticipated expiration: 2031-03-18

Abstract

The utility model provides a hydrocyclone radial flow type grit chamber, which comprises a chamber body, wherein a flow guide clapboard, a scum baffle, an overflow weir and a water outlet channel are arranged in the chamber body from inside to outside along the circumference of the chamber wall, a working bridge is arranged above the middle part of the chamber body, an equipment hoisting hole pipe is arranged at the central position of the working bridge, a scum discharge pipe is arranged above the designed water level of the chamber body and is vertical to the working bridge, a scum well and a water outlet well are arranged in the water outlet channel, the water outlet well is connected with a water outlet pipe, the outlet of the water outlet pipe is positioned on the outer side of the chamber body, and a water inlet pipe is arranged below the flow guide clapboard. The utility model improves the sand setting efficiency.

Description

Hydraulic cyclone radial-flow grit chamber

Technical Field

The utility model relates to the technical field of water treatment, in particular to a hydraulic cyclone radial-flow grit chamber.

Background

The pretreatment stage of the municipal sewage treatment plant usually requires the grit removal with a grit chamber with a relative density of 2.65 and a particle size of 0.2mm or more.

At present, common grit chambers include horizontal flow type grit chambers, aeration grit chambers, mechanical cyclone grit chambers and the like. The horizontal flow grit chamber mainly uses the sedimentation principle to settle sand, and needs longer sedimentation time, so that the occupied area is larger, and the horizontal flow grit chamber is not suitable for projects with more tense land. The aeration grit chamber makes the water body generate vertical rotational flow perpendicular to the water flow direction through aeration, and the grit sedimentation is accelerated. The aeration has the pre-aeration effect on the incoming water, is not beneficial to the denitrification and dephosphorization in the biochemical stage, and is indispensable to the municipal domestic sewage at present, so the application condition is limited, the required longer settling time is longer, and the occupied area is larger. The mechanical cyclone grit chamber mainly enables a water body to generate cyclone through mechanical stirring, and gravel is deposited at the bottom of the tank under the action of centrifugal force and gravity. Compared with the former two grit chambers, the process has short retention time and has no adverse effect on the subsequent process. However, the machine provides the rotational flow effect of the water body, so that the machine has a certain disturbance effect on the fine gravel, and the sand removing efficiency is influenced to a certain degree, so that the sand setting effect is not as good as the former two.

Therefore, a technical scheme for improving the sand setting effect is needed in the prior art.

SUMMERY OF THE UTILITY MODEL

Aiming at the defects of the prior art, the utility model provides a hydrocyclone radial-flow type grit chamber.

In order to achieve the purpose, the utility model is realized by the following technical scheme:

a hydrocyclone radial flow type grit chamber comprises a chamber body, wherein a flow guide partition plate, a scum baffle, an overflow weir and a water outlet channel are arranged in the chamber body from inside to outside along the circumference of the chamber wall, a working bridge is arranged above the middle part of the chamber body, an equipment hoisting hole pipe is arranged at the central position of the working bridge, scum discharge pipes are vertically arranged above the designed water level of the chamber body and the working bridge, a scum well and a water outlet well are arranged in the water outlet channel, the water outlet well is connected with a water outlet pipe, the outlet of the water outlet pipe is positioned outside the chamber body, a water inlet pipe is arranged below the flow guide partition plate, the water inlet pipe is perpendicular to the chamber wall and is tangent to the chamber wall, a grit hopper and a grit groove are arranged at the bottom of the chamber body, the grit hopper is inclined towards the middle grit groove from the bottom of the water inlet pipe, and the grit groove is connected with grit discharge pipes; the bottom of the grit chamber is provided with an annular sand washing pipe; the design water level top of cell body still is provided with washes the water pipe, wash the water pipe one end with the one end of dross calandria is linked together to still connect annular sand washing pipe, wash the other end of water pipe and be located the cell body outside, the other end of dross calandria with the dross well is connected.

The width of the diversion baffle plate is equal to the nominal diameter of the water inlet pipe, the distance between the diversion baffle plate and the water inlet pipe is half of the nominal diameter of the water inlet pipe, a flushing chamber is arranged on the diversion baffle plate close to the end part of the tank wall at the periphery of the tank wall, flushing holes are uniformly distributed in the flushing chamber, and the flushing chamber is connected with a flushing pipe.

The top of the scum discharge pipe is provided with a strip-shaped slag discharge square hole, and the scum discharge pipe can rotate along the shaft.

And a scum discharge pipe control rod is arranged on the scum discharge pipe.

The slope angle of the sand setting hopper is 30-45 degrees.

The hydraulic surface load is 80-100 m³/(m²·h)。

Compared with the prior art, the utility model has the advantages that:

1. the radial-flow weir discharges water, the weir grows up, the weir head is small, the sand carrying amount of water can be reduced, and the sand setting efficiency is improved.

2. The diversion baffle plate plays a role in diversion and reduction of short effluent, and disturbance of rotational flow to weir effluent can be reduced.

3. The hydraulic cyclone sand setting is characterized in that fine sand with relative density larger than that of water is gathered at the center of the bottom of the tank body due to the cyclone effect of the water body, and floating slag with relative density smaller than that of water is gathered at the edge of the water surface of the tank body.

4. Compared with the conventional grit chamber such as an aeration grit chamber and a mechanical rotary grit chamber, the sand-removing device has the advantages of small occupied area, no need of external force and higher removal efficiency on finer sand grains below 0.2 mm.

Drawings

Fig. 1 is a plan view of the present invention.

Fig. 2 is a sectional view taken along line a-a of fig. 1.

Fig. 3 is a sectional view taken along line B-B of fig. 1.

Detailed Description

The utility model will be further elucidated with reference to the embodiments described hereinafter

The hydrocyclone radial-flow grit chamber as shown in figures 1-3 comprises a chamber body, wherein a flow guide clapboard 2, a scum baffle 3, an overflow weir 1 and a water outlet channel 6 are arranged inside and outside the chamber body along the circumference of the chamber wall, and the hydraulic surface load (the ratio of the flow to the area of the grit chamber) of the grit chamber is 80-100 m³/(m²H). The whole body of the tank body is cylindrical, the upper edge of the outer wall of the cylindrical tank body is an overflow weir 1, and effluent water after the overflow weir 1 is collected by an effluent channel 6 and then discharged to a subsequent water treatment process. A scum well 14 and a water outlet well 7 are arranged in the water outlet channel 6, the water outlet well 7 is connected with a water outlet pipe 8, and the outlet of the water outlet pipe 8 is positioned on the outer side of the pool body. A water inlet pipe 5 is arranged below the diversion baffle plate 2, and the water inlet speed is controlled to be 1 m/s. The inlet end of the water inlet pipe 5 extends out of the tank body and is connected with a water supply structure, the height of the water inlet pipe 5 is positioned in the middle of the tank body, the water inlet pipe 5 is vertical to the tank wall, and the water inlet pipe 5 is tangent to the tank wall. The flow guide partition plate 2 is arranged along a certain distance on the water inlet pipe 5, the distance between the flow guide partition plate 2 and the water inlet pipe 5 is half of the nominal diameter of the water inlet pipe 5, the width of the flow guide partition plate 2 is equal to the nominal diameter of the water inlet pipe 5, the flow guide partition plate 2 plays a role in guiding water and reducing short effluent water, the disturbance of rotational flow to weir effluent water can be reduced, the flow guide partition plate 2 is close to the annular pool wall at the end part of the pool wall side for a circle to form a sweeping chamber, the sweeping chamber is uniformly provided with sweeping holes, the sweeping chamber is connected with the flushing pipe 16, and the sand setting on the flow guide partition plate 2 can be timely flushed by the high-pressure water pump.

A scum discharge pipe 11 is vertically arranged above the designed water level of the tank body and the working bridge 9, a scum discharge pipe control rod 13 is arranged on the scum discharge pipe 11, and the scum discharge pipe control rod 13 is used for adjusting the drainage of the scum discharge pipe to adapt to water level floating. The top end of the scum discharge pipe 11 is arranged near the water level of the design water level. The top of the scum calandria 11 is provided with a strip-shaped scum square hole, and the scum calandria 11 can rotate along the shaft to control the height of a scum outlet so as to adapt to the water level change caused by the water quantity change.

The bottom of the tank body is provided with a sand setting hopper 15 and a sand setting tank 12. The sand settling hopper 15 begins to slope from the bottom of the water inlet pipe 5 to the middle sand settling tank 12, and the slope angle of the sand settling hopper 15 is preferably 30-45 degrees. The volume of the grit chamber 12 is determined according to the sand content of the incoming water, and the volume is not less than 2 hours of grit amount. In this embodiment, the grit chamber 12 is located at the center of the bottom of the tank body, the grit chamber 12 is connected with the grit discharge pipe 4, and the grit discharge pipe 4 is connected with the sand-water separator to separate the drawn-out grit from the water.

The top at cell body middle part is provided with working bridge 9, and the central point of working bridge 9 puts and is provided with equipment hoist and mount hole pipe 10, and the diameter of equipment hoist and mount hole pipe 10 is looked the hoisting equipment size and is confirmed, and is not less than DN 1000. The equipment hoisting hole pipe 10 is used for sand discharge pumps, scum discharge pipes at the top, backflushing pipelines and other equipment in the grit chamber 12, and if the equipment is used for discharging sand by adopting a spiral mode, the form of the grit chamber 12 is suitable for a spiral conveyer to carry out corresponding modification design.

The bottom of the grit chamber 12 is provided with an annular sand washing pipe 17; still be provided with above the design water level of cell body and wash water pipe 16, the one end of washing water pipe 16 is linked together with the one end of dross calandria 11 for wash the dross, and still connect annular towards sand pipe 17, the other end of washing water pipe 16 is located the cell body outside, can connect the backwash water pump, for washing water pipe 16 supplies water, the water that gets into washing water pipe 16 reentries dross calandria 11 and annular towards sand pipe 17, the other end and the dross well 14 of dross calandria 11 are connected. A slag hopper car 18 is arranged below the scum well 14, and a grid is arranged in the slag hopper car 18. Flushing water from the backwashing water pump enters the scum well 14 through the flushing water pipe 16 and the scum discharge pipe 11, scum in the scum well 14 is discharged to the scum hopper car 18, the scum hopper car 18 transports scum outwards at regular intervals, and the sand flushing pipe 17 plays a role in backwashing settled sand and assisting the high-pressure water pump in discharging sand.

The diversion baffle plate 2 is provided with a sweeping chamber around the tank wall near the end part at the side of the tank wall, the sweeping chamber is provided with a sweeping hole, and settled sand on the baffle plate can be washed in time by a high-pressure water pump.

The rotational flow principle of the hydraulic rotational flow radial flow type grit chamber is similar to that of a mechanical rotational flow, and the main principle is as follows: 1. the rotational flow of the water flow generates centrifugal force to enable the water body to generate vortex, the rotational flow speed of fine sand in water at the middle upper part of the pool body is high, the centrifugal force is larger than the centripetal force to break away from a streamline and impact the pool wall, and the fine sand finally sinks to the bottom of the pool under the action of gravity; 2. because of the viscous force action of the bottom of the pool, the water flow velocity of the part of the middle lower part of the pool body close to the bottom of the pool is smaller, so that the centrifugal force of the fine sand carried by the water flow is reduced. Because the water body has a vortex, the closer to the center of the water body, the smaller the water pressure is, and the finer sand closer to the bottom of the pool is easier to be gathered to the center of the pool body under the action of radial pressure difference; 3. the motion rule of the scum with the density less than that of water is opposite to that of the fine sand, and the scum gradually floats to the water surface and is gathered at the edge of the pool wall and shows rotational flow motion. But the motive power of the water body rotational flow is not mechanical action but hydraulic action, and secondary disturbance of mechanical force is avoided; the radial-flow peripheral water outlet mode further reduces the sand carrying amount of the outlet water.

The sand-carrying water flow enters the tank body through the water inlet pipe 5, the incoming water performs rotational flow motion around the cylindrical tank body, and the energy required by the rotational flow effect is completely derived from the energy generated by the water head difference between the upstream and the downstream. Finally, the water entering the outlet channel 6 flows to the outlet well 7 and is discharged from the side wall of the grit chamber through the outlet pipe 8.

The above description is only for the preferred embodiment of the present invention, but the present invention is not limited to the above specific embodiments, and those skilled in the art can make various changes and modifications without departing from the inventive concept of the present invention, which falls into the protection scope of the present invention.

Claims

1. A hydrocyclone radial flow type grit chamber comprises a chamber body and is characterized in that a flow guide partition plate (2), a scum baffle plate (3), an overflow weir (1) and a water outlet channel (6) are arranged in the chamber body from inside to outside along the circumference of the chamber wall, a working bridge (9) is arranged above the middle part of the chamber body, an equipment hoisting hole pipe (10) is arranged at the central position of the working bridge (9), scum discharge pipes (11) are vertically arranged above the designed water level of the chamber body and the working bridge (9), a scum well (14) and a water outlet well (7) are arranged in the water outlet channel (6), the water outlet well (7) is connected with a water outlet pipe (8), the outlet of the water outlet pipe (8) is positioned outside the chamber body, a water inlet pipe (5) is arranged below the flow guide partition plate (2), the water inlet pipe (5) is vertical to the chamber wall and the water inlet pipe (5) is tangent to the chamber wall, the bottom of the pool body is provided with a sand settling hopper (15) and a sand settling tank (12), the sand settling hopper (15) starts to slope towards the middle sand settling tank (12) from the bottom of the water inlet pipe (5), and the sand settling tank (12) is connected with a sand settling calandria (4); the bottom of the sand setting tank (12) is provided with an annular sand washing pipe (17); the design water level top of cell body still is provided with washes water pipe (16), wash the one end of water pipe (16) with the one end of dross calandria (11) is linked together to still connect annular towards sand pipe (17), the other end that washes water pipe (16) is located the cell body outside, the other end of dross calandria (11) with dross well (14) are connected.

2. The hydrocyclone radial flow grit chamber according to claim 1, wherein the width of the diversion baffle (2) is equal to the nominal diameter of the water inlet pipe (5), the distance between the diversion baffle (2) and the water inlet pipe (5) is half of the nominal diameter of the water inlet pipe (5), the diversion baffle (2) is provided with a sweeping chamber around the side end part of the tank wall close to the tank wall, the sweeping chamber is uniformly provided with sweeping holes, and the sweeping chamber is connected with the flushing water pipe (16).

3. A hydrocyclone radial flow grit chamber according to claim 1, wherein the scum drain pipe (11) is provided with a scum drain pipe control lever (13).

4. A hydrocyclone/radial-flow grit chamber according to claim 1, wherein the scum pipe (11) is provided with a long-strip-shaped hole at the top, and the scum pipe (11) can rotate along the shaft.

5. A hydrocyclone radial flow grit chamber according to claim 1, wherein the angle of the slope of the grit chamber is 30 to 45 °.

6. A hydrocyclone radial flow grit chamber according to claim 1, wherein the hydraulic surface load is 80 to 100m³/(m²·h)。