CN114259759A - Sand removing device and sand removing method for aeration grit chamber - Google Patents
Sand removing device and sand removing method for aeration grit chamber Download PDFInfo
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- CN114259759A CN114259759A CN202111579367.XA CN202111579367A CN114259759A CN 114259759 A CN114259759 A CN 114259759A CN 202111579367 A CN202111579367 A CN 202111579367A CN 114259759 A CN114259759 A CN 114259759A
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Abstract
The utility model provides an aeration grit chamber sand removal device and sand removal method, aeration grit chamber sand removal device is including inhaling the sand pipe, air lift pump and sand water separator, the aeration grit chamber is equipped with the sand collection district that is located the bottom of the pool, water inlet and the aeration house steward that is located the pond, the air lift pump includes gas inlet, gas outlet and liquid outlet, the one end of inhaling the sand pipe is movably inserted and is located in the sand collection district, the other end is connected in the gas outlet of air lift pump, the liquid outlet of air lift pump passes through sand discharge pipeline with sand water separator and communicates, the air lift pump is used for absorbing the sand water mixture in sand collection district through inhaling the sand pipe, and carry sand water mixture to sand water separator through sand discharge pipeline. The sand removing device for the aeration grit chamber provided by the invention has the advantages that sand is sucked in the sand collecting area of the aeration grit chamber through the air stripping pump, so that the sand-water mixture can be efficiently extracted from the aeration grit chamber, and can be accurately removed in the sand-water separator, and the sand-water separation is realized.
Description
Technical Field
The invention belongs to the technical field of sewage treatment, and particularly relates to a desanding device and a desanding method for an aeration grit chamber.
Background
Because pipe network system rain sewage reposition of redundant personnel construction lags behind, the influent water sand content is high, and the component is complicated, current aeration desanding system lacks accurate control means, and is poor to the mud sand separation effect that the component is complicated. A large amount of silt is not effectively removed and enters a subsequent treatment unit, so that the inorganic content in a biochemical pond is increased, the MLVSS/MLSS value of the sludge is reduced, and the energy consumption and the equipment maintenance cost are increased. In a sewage plant with an anaerobic digestion system, a large amount of mud and sand can enter a sludge treatment unit along with mud discharge of a primary sedimentation tank, a sludge pump is abraded in the mud discharge process, the effective volume of the anaerobic digestion tank is reduced, uneven stirring is caused, the gas production rate of unit sludge is low, the stirring energy consumption and the operation and maintenance cost of the anaerobic digestion system are increased, and the construction and development of the anaerobic digestion system in China are hindered. Therefore, there is a need for a sand removing device for an aeration grit chamber to solve the above problems.
Disclosure of Invention
The invention aims to provide a desanding device and a desanding method for an aeration grit chamber, and aims to solve the problem of poor mud-sand separation effect of the aeration grit chamber.
In order to achieve the purpose, the invention provides a sand removing device of an aeration grit chamber, which comprises an air stripping pump and a sand-water separator, wherein the aeration grit chamber is provided with a sand collecting area, a water inlet and an aeration main pipe, the sand collecting area is positioned at the bottom of the sand chamber, the aeration main pipe is positioned in the sand chamber, the air stripping pump comprises a fan, an air pipe and a sand suction pipe, one end of the sand suction pipe is movably inserted in the sand collecting area, the other end of the sand suction pipe is communicated with the sand-water separator through a sand discharge pipeline, and the fan blows air into the sand suction pipe through the air pipe so that the sand suction pipe sucks a sand-water mixture in the sand collecting area and conveys the sand-water mixture to the sand-water separator through the sand discharge pipeline.
Preferably, the system further comprises a truss vehicle and a water pump, wherein the truss vehicle is arranged above the aeration grit chamber and moves along the length direction of the aeration grit chamber, and the fan is arranged on the truss vehicle;
and the water pump is connected to the middle part of the sand suction pipe through a back flush pipeline and is used for sucking the sand-water mixture of the aeration grit chamber to flush the sand suction pipe.
Preferably, still include controller and pressure sensor, pressure sensor monitors sand suction pipe pressure signal, the controller will pressure sensor's monitoring signal compares with preset pressure value to control the opening of purlin car stops with the opening of air stripping pump stops.
Preferably, the water-saving device also comprises a water inlet pipeline and an air inlet pipeline, wherein the water inlet is communicated with the water inlet pipeline, and the water inlet pipeline is provided with a water inlet flow meter;
the aeration main pipe is communicated with the air inlet pipeline through a plurality of aeration branch pipes, a gas flowmeter is arranged on the air inlet pipeline, and the controller receives monitoring signals of the water inlet flowmeter and monitoring signals of the gas flowmeter.
Preferably, a valve is arranged on the air inlet pipeline, and the controller controls the opening degree of the valve according to the gas flow monitored by the gas flowmeter and the water inlet flow monitored by the water inlet flowmeter.
Preferably, the controller calculates a difference Δ Q between the gas flow rate Q1 monitored by the gas flowmeter and a theoretical gas flow rate Q, and controls the opening of the valve such that Δ Q is smaller than a first threshold value.
Preferably, the theoretical gas flow Q is calculated by:
acquiring an optimal gas-water ratio through CFD simulation according to the size of the aeration grit chamber, the sand content and the grain size of inlet water entering the aeration grit chamber;
and calculating the theoretical gas flow Q according to the water inflow monitored by the water inflow meter and the optimal gas-water ratio.
Preferably, the controller calculates a difference Δ P between a pressure value P monitored by the pressure sensor and a preset pressure value P1, controls the truss vehicle to stop and controls the air lift pump to start when the Δ P is greater than a second threshold, and controls the truss vehicle to start and controls the air lift pump to stop when the Δ P is less than the second threshold.
Preferably, the length of the aeration main and the volume of the sand-water separator are determined by:
simulating the sand settling efficiency of the aeration sand settling tank under different gas-water ratios and lengths of aeration main pipes by CFD according to the size of the aeration sand settling tank, the sand content and the grain size of inlet water entering the aeration sand settling tank, and taking the length of the aeration main pipe corresponding to the highest sand settling efficiency as the length of the aeration main pipe;
and analyzing the particle size distribution of the sand-water mixture discharged by the sand discharge pipeline, and determining the volume of the sand-water separator according to the particle size distribution result.
The invention also provides a desanding method for the aeration grit chamber, which utilizes the desanding device for the aeration grit chamber, and comprises the following steps:
carrying out CFD simulation on the aeration grit chamber to obtain a gas-water ratio when the grit efficiency of the aeration grit chamber is highest, calculating a theoretical gas flow Q1 through the gas-water ratio and the sewage inflow of the aeration grit chamber, and controlling the aerated actual gas flow Q introduced into the aeration grit chamber so that the difference between the actual gas flow Q and the theoretical gas flow Q1 is smaller than a first threshold value;
monitoring the pressure value P of each accumulated sand point in the sand collection area, calculating the difference delta P between the pressure value P and a preset pressure value P1, and controlling the air lift pump to work to suck sand through the sand suction pipe when the delta P is larger than a second threshold value; when the delta P is smaller than a second threshold value, controlling the air stripping pump to drive the sand suction pipe (2) to move without sucking sand;
and determining the volume of the sand-water separator by analyzing the particle size of the sand-water mixture sucked by the sand suction pipe.
The invention relates to a desanding device of an aeration grit chamber, which has the beneficial effects that: the air lift pump sucks sand in the sand collecting area of the aeration grit chamber, so that sand-water mixture can be extracted from the aeration grit chamber efficiently, and the sand-water mixture is removed accurately in the sand-water separator, and sand-water separation is realized.
The invention relates to a desanding method for an aeration grit chamber, which realizes a triple desanding process through high-efficiency grit settling, intelligent desanding and accurate sand separation, accurately controls the whole desanding process and improves the efficiency of grit settling and sand suction.
Additional features and advantages of the invention will be set forth in the detailed description which follows.
Drawings
The above and other objects, features and advantages of the present invention will become more apparent by describing in more detail exemplary embodiments thereof with reference to the attached drawings, in which like reference numerals generally represent like parts throughout.
FIG. 1 shows a schematic view of an aerated grit chamber desanding apparatus according to an exemplary embodiment of the present invention;
fig. 2 is a schematic view showing the construction of an aerated grit chamber in the sand removing device for an aerated grit chamber according to an exemplary embodiment of the present invention;
FIG. 3 is a schematic view showing the construction of a sand-water separator in the sand removing device of the aerated grit chamber according to an exemplary embodiment of the present invention;
FIG. 4 is a schematic view illustrating a sand removing method of an aerated grit chamber according to an exemplary embodiment of the present invention;
fig. 5 is a model diagram illustrating CFD analysis of an aerated grit chamber of the method for desanding the aerated grit chamber according to an exemplary embodiment of the present invention;
FIG. 6 is a bar graph showing a particle size distribution analysis of sand water in the aerated grit chamber desanding method according to an exemplary embodiment of the present invention;
FIG. 7 is a graph showing the sand removal amount of sand removal of an aerated grit chamber compared with the sand removal amount of the prior art using the sand removal method of an aerated grit chamber according to an exemplary embodiment of the present invention;
description of reference numerals:
1 inflow flowmeter, 2 sand suction pipes, 3 pressure sensors, 4 fans, 5 air pipes, 6 air inlet pipelines, 7 valves, 8 gas flowmeters, 9 fans, 10 controllers, 11 sand-water separators, 12 aeration grit chambers, 13 sand collecting areas, 14 sand discharge pipelines, 15 aeration header pipes, 16 trussed cars, 17 water inlets, 18 water pumps and 19 backwashing pipelines.
Detailed Description
Preferred embodiments of the present invention will be described in more detail below. While the following describes preferred embodiments of the present invention, it should be understood that the present invention may be embodied in various forms and should not be limited by the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art.
In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the invention and to simplify the description, and are not intended to indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and are therefore not to be considered limiting of the invention.
In order to solve the problems in the prior art, as shown in fig. 1 to 3, the invention provides a sand removing device for an aeration grit chamber, which comprises an air stripping pump and a sand-water separator 11, wherein the aeration grit chamber 12 is provided with a sand collecting area 13 positioned at the bottom of the chamber, a water inlet 17 and an aeration main pipe 15 positioned in the chamber, the air stripping pump comprises a fan 4, an air pipe 5 and a sand suction pipe 2, one end of the sand suction pipe 2 is movably inserted in the sand collecting area 13, the other end of the sand suction pipe is communicated with the sand-water separator 11 through a sand discharge pipeline 14, and the fan 4 blows air into the sand suction pipe 2 through the air pipe 5, so that the sand suction pipe 2 sucks the sand-water mixture in the sand collecting area 13 and conveys the sand-water mixture to the sand-water separator 11 through the sand discharge pipeline 14.
The sand removing device for the aeration grit chamber, provided by the invention, has the advantages that the sand collecting area 13 of the aeration grit chamber 12 is sucked by the air stripping pump, so that the sand-water mixture can be effectively extracted from the aeration grit chamber 12 and accurately removed in the sand-water separator 11, and the sand-water separation is realized.
In this application, aeration grit chamber 12 belongs to current product, through gaseous in to aeration main 15, let in sewage in to aeration grit chamber 12 through water inlet 17, and make the sand-water separation of sewage in aeration grit chamber 12, and collect through sand collection district 13, this part function and structure etc. are known by the personnel in the field, and concrete structure is no longer repeated, the desanding device of this application, based on aeration grit system, absorb the sand in sand collection district 13 through the air lift pump and discharge, further improved the desanding effect.
The sand removing device of the aeration grit chamber further comprises a truss vehicle 16 and a water pump 18, the truss vehicle 16 is arranged above the aeration grit chamber 12 and moves along the length direction of the aeration grit chamber 12, a fan 4 of the air lift pump is arranged on the truss vehicle 16, one end of a sand suction pipe 2 is connected to an air pipe 5 of the fan 4, the other end of the sand suction pipe extends downwards from the truss vehicle 16 and is inserted into the bottom of the aeration grit chamber 12, namely a sand collection area 13, the truss vehicle 16 drives the air lift pump and drives the sand suction pipe 2 to move along with the truss vehicle 16, and therefore the sand suction pipe can be moved to each sand accumulation point of the sand collection area 13 to carry out pressure detection and sand suction;
the water pump 18 is connected to the middle part of the sand suction pipe 2 through a back flushing pipeline 19 and is used for sucking the sand-water mixture in the aeration grit chamber 12 and flushing the sand suction pipe 2. The water pump 18 and the fan 4 cannot run simultaneously, when the sand suction pipe 2 is blocked or gravel is retained more, the sand suction work of the air stripping pump can be stopped, the water pump 18 is started, the sand-water mixture is sucked by the power of the water pump 18 to wash the sand suction pipe 2, and the running power of the water pump 18 and the like are determined according to actual conditions.
The truss car 16 is the existing product, and the structure, the driving mode etc. of truss car 16 are no longer repeated, locate aeration grit chamber 12 top with truss car 16, and move along the length direction of aeration grit chamber 12, can make the air lift pump drive inhale sand pipe 2 and move to each position in sand collection district 13 and inhale sand.
The air lift pump is an existing product, the principle of the air lift pump is that sand-containing liquid is sucked by utilizing the change of the pressure inside and outside the sand suction pipe 2, the air pipe 5 is communicated with the middle part of the sand suction pipe 2 so as to convey the air of the fan 4 into the sand suction pipe 2, the other end of the sand suction pipe 2 is communicated with the sand discharge pipeline 14, the sand discharge pipeline 14 can be of a groove structure, a sand-water mixture in the sand suction pipe 2 is discharged into the sand discharge pipeline 14 through gravity, and the sand discharge pipeline 14 can be provided with a conveying pump for conveying the sand-water mixture in the sand discharge pipeline 14 into the sand-water separator 11. When the air lift pump works, air of the fan 4 enters the sand suction pipe 2 through the air pipe 5, so that the pressure in the sand suction pipe 2 is reduced, sand-containing liquid rises, air lift is realized, the sand-containing liquid falls into the sand discharge pipeline 2 under the action of gravity, and the connection mode of each pipeline is the prior art and is not repeated herein.
In this application, sand water separator 11 is equipped with inlet and sand outlet and delivery port, sand discharge pipeline 14 and inlet intercommunication, sand water mixture through sand discharge pipeline 14 transport gets into sand water separator 11, deposit etc. through certain structure at sand water separator, carry sand to the sand outlet that is located higher department through built-in screw conveyer in sand water separator 11, make sand water separation through gravity, sand water separator 11's inner structure is not the key of this application, no longer describe repeatedly.
The desanding device of the aeration grit chamber further comprises a controller 10 and a pressure sensor 3, the pressure sensor 3 monitors a pressure signal of the sand suction pipe 2, the controller 10 compares the monitoring signal of the pressure sensor 3 with a preset pressure value, and controls the start and stop of the truss car 17 and the start and stop of the air stripping pump.
The sand removing device of the aeration grit chamber also comprises a water inlet pipeline and an air inlet pipeline 6, wherein a water inlet 17 is communicated with the water inlet pipeline, and the water inlet pipeline is provided with a water inlet flow meter 1 for monitoring the water inlet quantity entering the aeration grit chamber 12;
the aeration main pipe 15 is arranged inside the aeration grit chamber 12 and is close to the inner wall of the aeration grit chamber 12, the aeration main pipe 15 is communicated with the air inlet pipeline 6 through a plurality of aeration branch pipes, the air inlet pipeline 6 is provided with a gas flow meter 8 for monitoring the aeration gas flow input to the air inlet pipeline 6, and the controller 10 receives a monitoring signal of the water inlet flow meter 1 and a monitoring signal of the gas flow meter 8.
The air inlet pipeline 6 is provided with a valve 7, and the controller 10 controls the opening degree of the valve 7 according to the gas flow monitored by the gas flowmeter 8 and the water inlet flow monitored by the water inlet flowmeter 1. Wherein, the valve 7 is an electric regulating valve and is electrically connected with the controller 10.
The controller 10 calculates a difference Δ Q between the gas flow rate Q1 monitored by the gas flowmeter 8 and the theoretical gas flow rate Q, and controls the opening degree of the valve 7 so that Δ Q is smaller than a first threshold value.
Wherein the theoretical gas flow Q is calculated by:
according to the size of the aeration grit chamber 12, the sand content and the grain diameter of the inlet water entering the aeration grit chamber 12, the optimal air-water ratio, namely the air-water ratio of the aeration grit chamber 12 when the grit efficiency is highest, is obtained through CFD simulation;
and calculating the theoretical gas flow Q according to the water inflow monitored by the water inflow meter 1 and the optimal gas-water ratio.
For the influent water, namely sewage, the information such as sand content particle size distribution obtained by experimental analysis belongs to the prior art, and the specific process is not repeated.
The actual gas flow rate Q1 may be obtained by the aerated gas flow rate into the aerated grit chamber 12 monitored by the gas flow meter 8.
As shown in fig. 5, a geometric model of the simulated aeration grit chamber 12 is constructed by using Computational Fluid Dynamics (CFD) according to the actual geometric dimension of the aeration grit chamber 12, the grit efficiency of the aeration grit chamber 12 under different gas-water ratio conditions and lengths of the aeration main pipe 15 is simulated, the optimal gas-water ratio and the length of the aeration main pipe 15 are determined according to the CFD simulation result, and the gas flow rate of aeration is obtained according to the optimal gas-water ratio and the actual water inflow, so as to control the opening of the valve 7, so that the actual gas flow rate of aeration meets the calculation requirement, and thus the grit efficiency of the aeration grit chamber 12 is effectively improved.
The air-water ratio of the aeration grit chamber 12 is determined through the CFD simulation technology, the air-water ratio is more accurate compared with the air-water ratio determined through general experience, reasonable aeration quantity in the aeration grit chamber 12 is kept, and the grit efficiency is improved while the electric energy is saved.
The controller 10 calculates a difference Δ P between a pressure value P monitored by the pressure sensor 3 and a preset pressure value P1, controls the truss car 16 to stop when the Δ P is greater than a second threshold value, controls the air lift pump to start, performs sand suction through the sand suction pipe 2 for a first preset time, controls the truss car 16 to start when the Δ P is less than the second threshold value, and controls the air lift pump to stop without performing sand suction.
The controller 10 accurately controls the sand suction process according to the pressure monitoring in the aeration grit chamber 12, wherein the preset pressure value P1 is empirical data, the preset range further includes a third threshold value, namely a preset high value, the second threshold value is n% P, namely a preset low value, the third threshold value is m% P, and m is greater than n;
when the delta P is larger than a second threshold and smaller than a third threshold, the controller 10 controls the truss car 16 to stop moving, the air lift pump is started, sand is sucked through the sand suction pipe 2, the sand suction process lasts for a first preset time, after the sand suction is finished, the controller 10 controls the air lift pump to stop working, and controls the truss car 16 to continue moving along the sand collection area 13, so that the pressure of each sand accumulation point of the sand collection area 13 is monitored through the pressure sensor 3 and the sand suction pipe 2;
when the delta P is smaller than a second threshold value, the controller 10 controls the truss vehicle 16 to move continuously without executing a sand suction process;
when the delta P is larger than a third threshold value, the controller 10 controls the truss car 16 to stop moving, the air lift pump is started, sand is sucked through the sand suction pipe 2, the sand suction process lasts for a second preset time, if the delta P is still larger than the third threshold value, the sand suction pipe 2 is possibly blocked, the controller 10 gives an alarm to prompt manual inspection, if the sand suction pipe is blocked or gravel is more retained, the truss car 16 can be controlled to stop moving, the air lift pump is not started, the water pump 18 is started, and the sand suction pipe 2 is backwashed to remove residues or blockages.
The length of the aeration header 15 and the volume of the sand-water separator 11 are determined by:
according to the size of the aeration grit chamber 12, the sand content and the grain diameter of the inlet water entering the aeration grit chamber 12, simulating the grit efficiency of the aeration grit chamber 12 under different gas-water ratios and the lengths of the aeration main pipes 15 by CFD, and taking the length of the aeration main pipe 15 corresponding to the highest grit efficiency as the length of the aeration main pipe 15;
and (3) carrying out particle size distribution analysis on the sand-water mixture discharged from the sand discharge pipeline 14, and determining the volume of the sand-water separator 11 according to the particle size distribution result.
The aeration grit chamber sand removing device sets up the installation initial stage in this application, can remove sand in advance and handle, acquire the sand water mixture from inhaling 2 air strippings of sand pipe and carry out the particle size distribution analysis to this sand water mixture through sand discharge pipe way 14, and calculate the sand grain footpath that acquires in the sand water mixture and account for the condition and the deposit condition, thereby confirm the volume of sand water separator 11 or optimize the settling zone structure, and then improved sand water separation efficiency, the grit has been reduced in a large number and has got into follow-up biological pond, biological pond effective volume has been ensured.
The structure of the sand-water separator 11 and the sand-water separation principle are prior art, which are not the key points of the application, and the specific principle is not repeated.
As shown in fig. 4, the present invention further provides a sand removing method for an aeration grit chamber, which utilizes the sand removing device for an aeration grit chamber, and comprises:
acquiring a gas-water ratio when the sand setting efficiency of the aeration grit chamber 12 is the highest by performing CFD simulation on the aeration grit chamber 12, calculating a theoretical gas flow Q1 through the gas-water ratio and the sewage inflow of the aeration grit chamber 12, and controlling the aerated actual gas flow Q introduced into the aeration grit chamber 12 so that the difference between the actual gas flow Q and the theoretical gas flow Q1 is smaller than a first threshold value;
monitoring the pressure value P of each sand accumulation point of the sand collection area 13, calculating the difference delta P between the pressure value P and a preset pressure value P1, and controlling the air lift pump to work to suck sand through the sand suction pipe 2 when the delta P is larger than a second threshold value; when the delta P is smaller than a second threshold value, controlling the air stripping pump to drive the sand suction pipe 2 to move without sucking sand;
the volume of the sand-water separator 11 is determined by analyzing the particle size of the sand-water mixture sucked by the sand suction pipe 2.
The sand removing method provided by the invention realizes a triple sand removing process through high-efficiency sand setting, intelligent sand removing and accurate sand separation, accurately controls the whole sand removing process, and improves the sand setting and sand suction efficiency.
Wherein, according to the size of the aeration grit chamber 12, the sand content and the grain diameter of the inlet water entering the aeration grit chamber 12, the sand setting efficiency of the aeration grit chamber 12 under different gas-water ratios and lengths of the aeration main pipes 15 is simulated through CFD, the length of the aeration main pipe 15 corresponding to the highest sand setting efficiency is taken as the length of the aeration main pipe 15 of the aeration grit chamber 12, the gas-water ratio corresponding to the highest sand setting efficiency is taken as the optimal gas-water ratio, the controller 10 calculates the gas flow rate of aeration according to the optimal gas-water ratio and the actual water inflow monitored by the inlet water flowmeter 1, namely under the condition of a certain water inflow, the theoretical gas flow rate Q of aeration achieving the optimal sand setting effect is obtained, the actual gas flow rate Q1 of aeration is obtained through the monitoring signal of the gas flowmeter 8, so as to obtain the delta Q1-Q, the controller 10 controls the opening degree of the valve 7 to control the delta Q within a first threshold value, therefore, the proportion of aeration and sewage entering the aeration grit chamber 12 is always ensured, namely the ratio of air to water is optimal, so that the grit efficiency of the aeration grit chamber 12 is optimal, the actual air flow of aeration meets the calculation requirement, and the grit efficiency of the aeration grit chamber 12 is effectively improved, wherein the first threshold value is +/-i% Q. The process is a first heavy sand removing process, namely a high-efficiency sand setting process, the actual gas flow of aeration is controlled in real time according to the optimal gas-water ratio, the aeration intensity space distribution is improved according to the length of the aeration main pipe 15 corresponding to the optimal gas-water ratio, and the sand setting efficiency of the aeration sand basin 12 is improved.
The controller 10 controls the trussed girder vehicle 16 to run in real time, the trussed girder vehicle 16 reciprocates along the aeration grit chamber 12, the sand suction pipe 2 always moves at each position in the sand collection area 13, the pressure condition of each accumulated sand point is monitored through the pressure sensor 3, the controller obtains a monitoring signal of the pressure sensor 3, namely a real-time pressure value P of the sand suction pipe 2, the real-time pressure value P is compared with a preset pressure value P1, the delta P is calculated to be P-P1, the delta P is a second difference value, and the preset pressure value P1 is empirical data. When the second difference value delta P is larger than a second threshold value n% P and smaller than a third threshold value m% P, it is indicated that the sand amount of the sand collecting area 13 exceeds a preset range, sand suction is needed, the controller 10 controls the truss car 16 to stop, and controls the operation of the air stripping pump to suck sand, and after sand suction is finished (whether sand suction is finished or not is judged according to sand suction time, namely between first preset values), the controller 10 controls the truss car 16 to continue to move; when the second difference value delta P is smaller than a second threshold value n% P, the sand amount of the sand collecting area 13 is in a preset range, sand suction is not needed temporarily, the truss vehicle 16 keeps normal operation, and sand suction operation is not performed; when the second difference value delta P is larger than a third threshold value m% P, the sand amount of the sand collecting area 13 is in a range exceeding a preset range, sand suction is needed, the controller 10 controls the truss vehicle 16 to stop to suck sand, after the second preset time, if the second difference value delta P is still larger than the third threshold value m% P, the controller 10 gives an alarm, the machine can be stopped to check whether the sand suction pipe 2 is blocked, if the sand suction pipe 2 is not blocked, the controller 10 controls the air stripping pump and the like to enable the sand suction pipe 2 to continuously suck sand until the delta P is smaller than the second threshold value n% P, and if the sand suction pipe 2 is blocked, the water pump 18 can be started to perform back washing. The process is a second-time desanding process, namely an intelligent desanding process, and can automatically control the operation state of the air stripping pump according to the condition of the sand deposition amount in the tank, maintain the efficient sand extracting effect and save electric energy.
The sand-water mixture stripped from the sand suction pipe 2 is obtained through the sand discharge pipeline 14, the grain size distribution of the sand-water mixture is analyzed, and the sand grain diameter ratio condition and the sedimentation condition of the sand-water mixture are calculated and obtained, so that the volume of the sand-water separator 11 is determined, the sand-water separation efficiency is improved, the sand entering into a subsequent biological pool is greatly reduced, and the effective volume of the biological pool is ensured. The process is a third sand removing process, namely an accurate sand separating process, and improves the sand-water separation efficiency by optimizing the volume of the sand-water separator 11. Through the triple accurate control desanding process, the full flow of desanding can be accurately controlled, the sediment of the silt in the aeration grit chamber 12 is guaranteed, the silt is efficiently extracted from the aeration grit chamber through the air stripping pump, and the silt is accurately removed in the grit separator 11, so that the grit-water separation is realized.
The method has the characteristics of simple equipment maintenance and low investment, and has a good sand removing effect.
Examples
Taking an aeration grit chamber desanding device with a certain size specification as an example, according to the size of the aeration grit chamber 12 and the sand content and the grain size of inlet water entering the aeration grit chamber 12, through CFD simulation, the optimal gas-water ratio of 0.1/1 and the length of an aeration pipe of 8.5m can be obtained, the controller 10 calculates the theoretical gas flow Q of aeration according to the optimal gas-water ratio of 0.1/1 and the actual inlet water flow monitored by the inlet water flow meter 1, the first threshold value is set to be +/-5% Q, the controller 10 controls the opening of the valve 7, and the first difference value delta Q between the actual gas flow Q1 monitored by the gas flow meter 8 and the theoretical gas flow Q is within +/-5% Q, so as to achieve the highest grit efficiency.
The controller 10 controls the truss vehicle 16 to run in real time, receives a real-time pressure value P monitored by the pressure sensor 3 in real time, calculates a second difference value delta P between the real-time pressure value P and a preset pressure value P1, compares the delta P with a preset range, sets a second threshold n% P of the preset range as 2% P, sets a first preset time as 30 minutes, and when the delta P is greater than the second threshold, the controller 10 controls the truss vehicle 16 to stop running, starts the air lift pump to suck sand through the sand suction pipe 2, the sand suction time is 30 minutes, and after the 30 minutes, the air lift pump stops working, the sand suction stops, and the truss vehicle 16 continues to run. In addition, the girder 16 does not stop running and does not perform the sand suction operation.
The sand-water mixture extracted by the sand suction pipe 2 is used for analyzing the particle size distribution of the sand-water, and the analysis result is as shown in figure 6, so that the volume of the sand-water separator 11 can be determined to be 9.3m according to the particle size distribution3。
As shown in fig. 7, by the sand removing device and the sand removing method for the aeration grit chamber, the aeration grit chamber 12 system is modified, the average sand output after the system is modified is 126% compared with that before the system is modified, and the improvement effect is obvious.
Through the aeration grit chamber desanding device and the desanding method, in the sewage treatment plant with the aeration grit chamber 12, the sand can be efficiently settled, extracted and desanded, the amount of sand and mud entering the biological tank is obviously reduced, the effective volume of the biological tank is ensured, and the wear rate of subsequent equipment is reduced.
Having described embodiments of the present invention, the foregoing description is intended to be exemplary, not exhaustive, and not limited to the embodiments disclosed. Many modifications and variations will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the described embodiments.
Claims (10)
1. The utility model provides an aeration grit chamber sand removal device, its characterized in that includes air stripping pump and sand water separator (11), aeration grit chamber (12) are equipped with sand collection district (13), water inlet (17) that are located the bottom of the pool and are located aeration house steward (15) in the pond, the air stripping pump includes fan (4), tuber pipe (5) and inhales sand pipe (2), inhale that the one end of sand pipe (2) is movably inserted and is located in the sand collection district (13), the other end connect in through sand discharge pipeline (14) with sand water separator (11) intercommunication, fan (4) pass through tuber pipe (5) to blow in inhaling sand pipe (2), so that inhale sand pipe (2) absorb the sand water mixture of sand collection district (13), and through sand discharge pipeline (14) will the sand water mixture carry to sand water separator (11).
2. An aeration grit chamber desanding device according to claim 1, further comprising a truss vehicle (16) and a water pump (18), wherein said truss vehicle (16) is disposed above said aeration grit chamber (12) and moves along the length direction of said aeration grit chamber (12), and said fan (4) is disposed on said truss vehicle (16);
the water pump (18) is connected to the middle part of the sand suction pipe (2) through a back flush pipeline (19) and is used for sucking the sand-water mixture of the aeration grit chamber (12) to flush the sand suction pipe (2).
3. An aeration grit chamber desanding device according to claim 2, further comprising a controller (10) and a pressure sensor (3), wherein the pressure sensor (3) monitors a pressure signal of the sand suction pipe (2), and the controller (10) compares the monitoring signal of the pressure sensor (3) with a preset pressure value and controls the start and stop of the truss car (17) and the start and stop of the air stripping pump.
4. An aerated grit chamber desanding device according to claim 3 further comprising a water inlet line and an air inlet line (6), said water inlet (17) being in communication with said water inlet line, said water inlet line being provided with a water inlet flow meter (1);
the aeration main pipe (15) is communicated with the air inlet pipeline (6) through a plurality of aeration branch pipes, a gas flowmeter (8) is arranged on the air inlet pipeline (6), and the controller (10) receives monitoring signals of the water inlet flowmeter (1) and monitoring signals of the gas flowmeter (8).
5. An aeration grit chamber desanding device according to claim 4, wherein a valve (7) is arranged on the air inlet pipeline (6), and the controller (10) controls the opening degree of the valve (7) according to the air flow monitored by the air flow meter (8) and the inlet water flow monitored by the inlet water flow meter (1).
6. An aerated grit chamber desanding device according to claim 5, wherein said controller (10) calculates the difference Δ Q between the gas flow rate Q1 monitored by said gas flow meter (8) and the theoretical gas flow rate Q, and controls the opening of said valve (7) so that said Δ Q is smaller than a first threshold value.
7. An aerated grit chamber desanding device according to claim 6 wherein said theoretical gas flow rate Q is calculated by:
acquiring an optimal gas-water ratio through CFD simulation according to the size of the aeration grit chamber (12), the sand content and the grain diameter of inlet water entering the aeration grit chamber (12);
and calculating the theoretical gas flow Q according to the water inflow monitored by the water inflow meter (1) and the optimal gas-water ratio.
8. An aerated grit chamber desanding device according to claim 5, wherein said controller (10) calculates the difference Δ P between the pressure value P monitored by said pressure sensor (3) and a preset pressure value P1, controls said truss vehicle (16) to stop and said air-lift pump to start when said Δ P is greater than a second threshold value, and controls said truss vehicle (16) to start and said air-lift pump to stop when said Δ P is less than said second threshold value.
9. An aerated grit chamber desanding device according to claim 6, wherein the length of the aeration header (15) and the volume of the sand-water separator (11) are determined by:
according to the size of the aeration grit chamber (12), the sand content and the grain diameter of inlet water entering the aeration grit chamber (12), simulating the grit efficiency of the aeration grit chamber (12) under different gas-water ratios and lengths of aeration main pipes (15) by CFD, and taking the length of the aeration main pipe (15) corresponding to the highest grit efficiency as the length of the aeration main pipe (15);
and (3) carrying out particle size distribution analysis on the sand-water mixture discharged by the sand discharge pipeline (14), and determining the volume of the sand-water separator (11) according to the particle size distribution result.
10. An aeration grit chamber desanding method using the aeration grit chamber desanding device according to any one of claims 1 to 5, characterized in that the method comprises:
carrying out CFD simulation on the aeration grit chamber (12), acquiring a gas-water ratio when the grit efficiency of the aeration grit chamber (12) is highest, calculating a theoretical gas flow Q1 through the gas-water ratio and the sewage inflow of the aeration grit chamber (12), and controlling the aerated actual gas flow Q introduced into the aeration grit chamber (12) so that the difference between the actual gas flow Q and the theoretical gas flow Q1 is smaller than a first threshold value;
monitoring the pressure value P of each sand accumulation point of the sand collection area (13), calculating the difference delta P between the pressure value P and a preset pressure value P1, and controlling the air lift pump to work to suck sand through the sand suction pipe (2) when the delta P is larger than a second threshold value; when the delta P is smaller than a second threshold value, controlling the air stripping pump to drive the sand suction pipe (2) to move without sucking sand;
and determining the volume of the sand-water separator (11) by analyzing the particle size of the sand-water mixture sucked by the sand suction pipe (2).
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| Application Number | Priority Date | Filing Date | Title |
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| CN202111579367.XA CN114259759A (en) | 2021-12-22 | 2021-12-22 | Sand removing device and sand removing method for aeration grit chamber |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202111579367.XA CN114259759A (en) | 2021-12-22 | 2021-12-22 | Sand removing device and sand removing method for aeration grit chamber |
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| CN114259759A true CN114259759A (en) | 2022-04-01 |
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| CN202111579367.XA Pending CN114259759A (en) | 2021-12-22 | 2021-12-22 | Sand removing device and sand removing method for aeration grit chamber |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115010202A (en) * | 2022-06-18 | 2022-09-06 | 杜程阳 | Aeration grit chamber for sewage treatment and purification and use method thereof |
| CN115738397A (en) * | 2022-12-07 | 2023-03-07 | 青岛双元水务有限公司 | Horizontal-flow aeration sand-extracting system |
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| CN115738397A (en) * | 2022-12-07 | 2023-03-07 | 青岛双元水务有限公司 | Horizontal-flow aeration sand-extracting system |
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