CN112978885A - Wastewater treatment lime milk preparation and adding device - Google Patents
Wastewater treatment lime milk preparation and adding device Download PDFInfo
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- CN112978885A CN112978885A CN202110205401.0A CN202110205401A CN112978885A CN 112978885 A CN112978885 A CN 112978885A CN 202110205401 A CN202110205401 A CN 202110205401A CN 112978885 A CN112978885 A CN 112978885A
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- 235000008733 Citrus aurantifolia Nutrition 0.000 title claims abstract description 106
- 235000011941 Tilia x europaea Nutrition 0.000 title claims abstract description 106
- 239000004571 lime Substances 0.000 title claims abstract description 106
- 239000008267 milk Substances 0.000 title claims abstract description 53
- 210000004080 milk Anatomy 0.000 title claims abstract description 53
- 235000013336 milk Nutrition 0.000 title claims abstract description 53
- 238000002360 preparation method Methods 0.000 title claims abstract description 38
- 238000004065 wastewater treatment Methods 0.000 title claims abstract description 19
- 239000000843 powder Substances 0.000 claims abstract description 110
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 79
- 238000000034 method Methods 0.000 claims abstract description 26
- 239000000839 emulsion Substances 0.000 claims abstract description 24
- 239000000428 dust Substances 0.000 claims abstract description 17
- 238000007865 diluting Methods 0.000 claims abstract description 14
- 238000003756 stirring Methods 0.000 claims abstract description 13
- 238000007667 floating Methods 0.000 claims abstract description 9
- 239000007788 liquid Substances 0.000 claims description 42
- 239000000463 material Substances 0.000 claims description 22
- 238000012216 screening Methods 0.000 claims description 10
- 239000003638 chemical reducing agent Substances 0.000 claims description 8
- 229910000975 Carbon steel Inorganic materials 0.000 claims description 6
- 239000010962 carbon steel Substances 0.000 claims description 6
- 239000000203 mixture Substances 0.000 claims description 6
- 239000008235 industrial water Substances 0.000 claims description 5
- 238000005260 corrosion Methods 0.000 claims description 4
- 238000010790 dilution Methods 0.000 claims description 4
- 239000012895 dilution Substances 0.000 claims description 4
- 238000004090 dissolution Methods 0.000 claims description 4
- 238000009434 installation Methods 0.000 claims description 4
- 230000005540 biological transmission Effects 0.000 claims description 3
- 238000002156 mixing Methods 0.000 claims description 3
- 229910000831 Steel Inorganic materials 0.000 claims description 2
- 230000006978 adaptation Effects 0.000 claims description 2
- 238000010276 construction Methods 0.000 claims description 2
- 239000002244 precipitate Substances 0.000 claims description 2
- 238000003825 pressing Methods 0.000 claims description 2
- 239000000047 product Substances 0.000 claims description 2
- 239000007921 spray Substances 0.000 claims description 2
- 239000010959 steel Substances 0.000 claims description 2
- 210000000481 breast Anatomy 0.000 claims 1
- 230000001105 regulatory effect Effects 0.000 claims 1
- 230000000694 effects Effects 0.000 abstract description 8
- 239000013505 freshwater Substances 0.000 abstract description 2
- AXCZMVOFGPJBDE-UHFFFAOYSA-L calcium dihydroxide Chemical compound [OH-].[OH-].[Ca+2] AXCZMVOFGPJBDE-UHFFFAOYSA-L 0.000 description 10
- 229910001861 calcium hydroxide Inorganic materials 0.000 description 10
- 235000011116 calcium hydroxide Nutrition 0.000 description 10
- 239000000920 calcium hydroxide Substances 0.000 description 10
- 238000007599 discharging Methods 0.000 description 6
- 238000005352 clarification Methods 0.000 description 4
- 238000005189 flocculation Methods 0.000 description 4
- 230000016615 flocculation Effects 0.000 description 4
- 238000001556 precipitation Methods 0.000 description 3
- 239000010802 sludge Substances 0.000 description 3
- 230000001502 supplementing effect Effects 0.000 description 3
- 238000003912 environmental pollution Methods 0.000 description 2
- 239000010842 industrial wastewater Substances 0.000 description 2
- 239000013049 sediment Substances 0.000 description 2
- 238000004062 sedimentation Methods 0.000 description 2
- 239000010865 sewage Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005345 coagulation Methods 0.000 description 1
- 230000015271 coagulation Effects 0.000 description 1
- 239000000084 colloidal system Substances 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 239000010881 fly ash Substances 0.000 description 1
- 238000010992 reflux Methods 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 239000002351 wastewater Substances 0.000 description 1
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
- C02F1/529—Processes or devices for preparing lime water
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
- C02F1/5236—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using inorganic agents
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/66—Treatment of water, waste water, or sewage by neutralisation; pH adjustment
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- Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Organic Chemistry (AREA)
- Inorganic Chemistry (AREA)
- Mixers Of The Rotary Stirring Type (AREA)
Abstract
The invention discloses a lime milk preparation and adding device for wastewater treatment, which comprises: the system comprises a storage bin, a lime milk preparation device, a dissolving and diluting device and a water supply device; the lime powder is conveyed to a storage bin by a tank car through a conveying pipeline; the upper part of the bin is provided with a dust removal respirator, the top of the bin is additionally provided with a rotation-resistant level indicator, two cone parts below the bin are respectively additionally provided with two vibration motors, and the lower part of the bin is also provided with a floating sieve filter type bin vibration head; the lime milk preparation device comprises a powder quantitative feeder and a cyclone digester; the dissolving and diluting device comprises a dissolving tank, a dissolving tank stirrer, a stirring tank and a feeding pump, and is used for dissolving, diluting and feeding lime emulsion; the water supply device is connected with industrial fresh water. The invention realizes the continuous, stable and accurate preparation and addition of the lime milk in the water treatment process, and effectively improves the water treatment effect.
Description
Technical Field
The invention relates to a lime milk preparation and adding device for wastewater treatment, and belongs to the technical field of sewage treatment.
Background
In the existing industrial wastewater treatment, a high-density clarification tank is mostly adopted for pretreatment, so that the purposes of removing TSS, turbidity, partial organic matters and the like in raw water are achieved. The high-density clarification tank fully plays a role in contact flocculation of the sludge, and the accelerated and efficient flocculation precipitation of the sludge can be realized through the sludge reflux in a certain proportion.
Lime is added into the conventional high-density clarification tank, the main effect is to adjust the pH value, the lime can play a certain degree of coagulation aiding effect on colloid in water, the sedimentation separation of suspended matters can be accelerated, the flocculation precipitation effect is improved, the lime can also reduce the hardness in wastewater, and the lime is an indispensable process link of the high-density clarification tank.
The lime adding device mainly comprises a dry adding device and a wet adding device, wherein the dry adding device adopts a dry adding machine, and the civil engineering, the equipment and the supporting facilities thereof have large investment and serious environmental pollution and are not commonly used at present; the lime milk is prepared by conventional slaked lime powder and a lime adding device is added in a wet mode, and the slaked lime is easy to fly ash in the conveying process and the discharging process of the slaked lime to a storage tank, so that the environmental pollution is caused; the lime blanking and the water proportioning are not accurate; due to the fact that a large amount of water vapor generated in the lime milk preparation process rises, a blanking pipeline at the bottom of a powder bin is easy to block, and the lime metering error is large; the adoption of the feeding pump and the unreasonable design of the feeding pipeline lead to frequent faults of the feeding pump, serious scaling tendency of the pipeline and influence on the water treatment effect.
Disclosure of Invention
The invention aims to provide a lime milk preparation and addition device for wastewater treatment, which realizes continuous, stable and accurate preparation and addition of lime milk.
The invention provides a lime milk preparation and adding device for wastewater treatment, which comprises five parts: a lime powder storage device (stock bin), a lime milk preparation device, a dissolving and diluting device and a water supply device;
the lime powder storage device (hereinafter referred to as a bin):
the lime powder is conveyed to the storage bin by a special tank car through a conveying pipeline. The upper part of the storage bin is provided with the dust removal respirator, so that the powder can smoothly enter the storage bin and cannot cause secondary pollution to the environment, and the rotation-resistant material level meter is additionally arranged on the top of the storage bin, so that the lowest storage capacity and the highest storage capacity of the powder can be accurately monitored, and a worker is prompted whether to convey the powder into the storage bin or not.
In order to prevent lime powder from hardening in the bin and influencing the accurate supply of the powder, two cone parts below the bin are respectively provided with two vibrating motors, and the vibrating motors are started during blanking to ensure that the powder is not easy to adhere to the bin wall. In addition, the lower part of the bin is also provided with a floating screening type bin vibrating head, so that the powder can smoothly enter the powder quantitative feeder through the floating screening type bin vibrating head.
The lime milk preparation device comprises a powder quantitative feeder and a cyclone digester;
the powder quantitative supply machine can quantitatively add the powder into the digester according to the process requirement.
The cyclone slaker is an important device in the device, and powder entering the slaker is mixed with a certain amount of water, and finally the mixture is made into lime emulsion with a certain concentration after being slaked and mixed.
The dissolving and diluting device comprises a dissolving tank, a stirrer and a feeding pump, and is used for dissolving the tank and feeding lime emulsion;
the dissolving tank is used for containing lime emulsion, and water can be added to adjust the concentration of the lime emulsion. The dissolving tank is provided with a stirrer and an ultrasonic liquid level meter, and the stirrer is used for stirring liquid so that the liquid cannot form sediment; the ultrasonic liquid level meter is used for detecting the height of the liquid level, then the control device is used for controlling whether the feeding is carried out, and the stirred lime emulsion is fed to the site by adopting a circulating feeding and discharging branch pipe through a pump.
The water supply device is connected with industrial fresh water and is provided with a water replenishing flowmeter, a water replenishing valve and water replenishing upper and lower valves.
The new industrial water is used in the device to ensure the service life of the valve, the flowmeter and the like, and the flowmeter is arranged on the pipeline to observe whether the water quantity in the pipeline meets the process requirement at any time. Water supply point: the diameter of 2-path water supply in the digester is DN 50.
The air used by the device is compressed air for instruments, and the dried compressed air is purified by the air triple piece and then supplied to the powder supply machine.
Furthermore, the feed bin adopts enclosed construction, carbon steel product, installs dust removal respirator on it, hinders 3 of rotating type charge level indicator, installs 4 vibrating motor, 2 feed bin vibration heads, is equipped with 1 vibrating motor on the vibration head.
Further, the effective volume of the silo: 100m3The container is a closed pressureless container by adopting a middle supporting mode; the purpose of the main storage bin is as follows: the storage bin is used for storing lime powder below 200 meshes, so that the operation condition of auxiliary equipment on the storage bin is required to be checked in time for achieving the storage purpose.
Furthermore, the bin vibrating head can vibrate randomly, and has a screening function, so that hardened blocky materials cannot enter the powder supply machine. The working principle is as follows: during blanking, the vibration head of the storage bin swings to loosen hardened block materials in the materials, so that the blanking is more uniform. The vibration head is provided with a material blocker, the position of the material blocker is generally adjusted once during installation, the material blocker is mainly used for adjusting the blanking speed, and the material blocker is maintained in the same storage bin.
Furthermore, a dust removal respirator is arranged at the top end of the storage bin. The working principle is as follows: when the tank car is used for conveying materials into the storage bin, the storage bin is closed, so that air in the storage bin is discharged out of the storage bin, otherwise, the materials cannot be thrown, the air is discharged out of the storage bin and is bound to bring out some dust, the respirator is used for ventilating and recovering the leaked dust, so that secondary pollution is prevented, and after the feeding is finished, the vibrating motor on the respirator is started, so that the dust in the filter bag can be discharged into the storage bin.
Still further, the main technical performance parameters of the dust-removing respirator are: mesh number of filter cloth: 400 meshes; a vibration-resistant motor: 0.37KW, triphase, 380V; the rotating speed of the motor is as follows: 1450 rpm; effective area of filtration：25m2(ii) a A fan: 3.0kw, 5000 m/h air volume.
The storage bin comprises 4 vibration motors, 2 vibration motors are respectively arranged on cones on the storage bin, and one vibration motor is respectively arranged on a vibration head of the storage bin.
Further, the slide valve is arranged at the bottom of the loosening device and comprises a rotating hand wheel, and the gate plate runs to an ideal position in the gate groove through screw rod transmission, so that the opening and closing work of discharging of the storage bin is realized.
The main technical properties are as follows: a. the opening and closing stroke is 280 mm; b. adaptation medium: a powdery material.
Further, in the lime milk preparation device, the working principle of the powder quantitative feeder is as follows: firstly, pressing down a starting switch, and driving a motor to transmit power to a speed reducer; secondly, the screw shaft rotates clockwise, and the materials are pushed into the digester; and thirdly, the supply amount can be changed by adjusting the frequency of the motor without the speed reducer during operation.
The main technical performance of the powder quantitative supply machine is as follows: a. supply amount: (1000-4000) L/h; b. the method comprises the following steps of (1) providing a motor: 1.1 KW; c. the speed regulation range is as follows: (10-48) r/min; d. impeller diameter: 145 mm; adjusting the supply amount:
the theoretical output powder amount of the screw shaft is 1.5L/rotation. In the running process of the machine, the rotating speed of the spiral shaft can be changed by changing the frequency of the motor of the speed reducer so as to adjust the output quantity of the powder.
Further, the working principle of the cyclone digester is as follows: the spray head and tangent water inlet structure inside the cyclone digester make lime and water rotate to mix and digest the material and water fully and uniformly, so as to achieve the aim of preparing 'emulsion'; the digester adopts a carbon steel anti-corrosion structure.
Further, in the dissolving and diluting device, the working principle of the dissolving tank stirrer is as follows: two sections of push type square wing axial flow stirring paddles, a vertical cycloidal pin gear speed reducer and a motor are adopted for driving. The middle of the machine base adopts two-stage middle support, and the speed reducer is connected with the transmission shaft by a roller chain coupling, so that the machine runs more stably. The stirrer is a vertically-installed stirrer for the tank, the stirrer is installed on a steel frame at the top of a stirring box, a main shaft and blades are directly inserted into the tank for stirring, and the central line of the main shaft is ensured to be on a plumb line during installation. The main technical performance parameters of the dissolving tank stirrer are as follows: motor power: 7.5 kw; impeller diameter: 1050mm double layers; impeller rotating speed: 42 rpm;
the agitator tank has 2, single effective volumes: 30m3A carbon steel anti-corrosion structure is adopted; the feeding pump comprises: adopting screw pump, the flow rate is 20m3/h。
The invention provides a use method of the wastewater treatment lime milk preparation and adding device, which comprises the following steps:
(1) addition of powder
Powder of the storage bin is pumped into the storage bin through a conveying pipeline by a special tank car, when the powder reaches an upper limit H, an alarm is displayed on a touch screen of a PLC control cabinet, and the feeding is stopped at the moment; starting a dust removal respirator fan at the same time of feeding, and stopping the fan after the feeding is stopped; after the feeding is stopped, the respirator vibrates the motor and runs for three minutes and then stops. When the powder in the storage bin is used and is lower than the lower limit M, the touch screen displays an alarm, and the feeding is carried out again until the powder is added to the upper limit H.
(2) Feeding of bin powder and preparation of lime milk
2 vibrating motors on the bin and the vibrating motor on the vibrating head are started, the slide valve is opened, the powder quantitative conveyor is started, the powder enters the cyclone digester from the bin through the slide valve and the powder quantitative conveyor at the moment, the water supply point on the cyclone digester supplies water at the same time, and lime milk prepared by full mixing flows into the dissolving tank.
(3) Dissolution and dilution
As long as the liquid level in the dissolving tank is above the stirring liquid level, starting the stirrer to operate, otherwise, stopping the stirrer;
when the concentration of lime milk in the dissolving tank is too high (higher than the process requirement), the water supply amount can be increased (or the powder supply amount can be reduced);
the start of the dosing pump is controlled by the level of the liquid in the dissolving tank, i.e. when the liquid level in the dissolving tank reaches the pump-on level. The pump is started, the pump is started by manual and automatic optional control, and the pump is always in a working state as long as the liquid level is higher than the liquid level of the pump, unless the process needs to be stopped.
The lime milk flowing out of the cyclone digester flows into the dissolving tank, and when the dissolving tank reaches the highest liquid level H, the powder quantitative feeder stops feeding and stops water supply;
and starting the feeding pump, and quantitatively conveying the prepared lime milk to a feeding point of a water treatment facility.
The invention has the beneficial effects that:
by implementing the method, the application problems that lime is raised easily, lime is not accurately proportioned with water, lime metering error is large and water treatment effect is influenced due to the fact that lime is easily blocked by a discharging pipeline in the process of conveying the hydrated lime to a storage tank and the discharging process of a conventional hydrated lime powder preparation lime milk device are solved, continuous, stable and accurate preparation and feeding of the lime milk in a water treatment process are realized, and the water treatment effect is effectively improved.
Drawings
FIG. 1 is a schematic view of a lime milk preparation and addition device for wastewater treatment according to the present invention.
In the figure: the device comprises a storage bin 1, a powder quantitative supply machine 2, a cyclone digester 3, a dissolving tank 4, a stirrer 5, a feeding pump 6, a feeding pipe 7, a breather 8, a material level meter 9, a loosening device 10, a sliding valve 11, a water supplementing valve 12, an upper water supplementing valve 13, a lower water supplementing valve 14, a liquid level meter 15 and a vibration motor 16. A is industrial compressed air, B is lime milk adding point, and C is industrial water.
Detailed Description
The present invention is further illustrated by, but is not limited to, the following examples.
Example 1:
the following is detailed with reference to fig. 1: a wastewater treatment lime milk preparation and adding device comprises: a storage bin 1, a lime milk preparation device, a dissolving and diluting device and a water supply device;
the silo 1 has the functions of: the lime powder is conveyed to a storage bin by a tank car through a conveying pipeline; the upper part of the bin is provided with a dust removal respirator 8, so that the powder can smoothly enter the bin without causing secondary pollution to the environment, and the rotation-resistant material level meter 9 is additionally arranged on the top of the bin and can accurately monitor the lowest storage capacity and the highest storage capacity of the powder, so that a worker is prompted whether to convey the powder into the bin or not; two vibration motors are respectively arranged on the two conical parts below the storage bin, and the vibration motors are started during blanking, so that powder is not easy to adhere to the wall of the storage bin; the lower part of the bin is also provided with a floating screening type bin vibrating head, so that the powder can smoothly enter the powder quantitative feeder through the floating screening type bin vibrating head;
the lime milk preparation device comprises a powder quantitative feeder 2 and a cyclone digester 3; the powder quantitative supply machine can quantitatively add the powder into the digester according to the process requirement; the cyclone digester is important equipment in the device, powder entering the digester is mixed with a certain amount of water, and the mixture is digested and mixed to finally prepare lime emulsion;
the dissolving and diluting device comprises a dissolving tank 4, a stirrer 5 and a feeding pump 6, and is used for dissolving, diluting and feeding lime emulsion;
the dissolving tank 4 is used for containing lime emulsion, and simultaneously can be added with water to adjust the concentration of the lime emulsion, a stirrer 5 and an ultrasonic liquid level meter 15 are arranged on the dissolving tank, and the stirrer is used for stirring liquid so that the liquid cannot form precipitates; the ultrasonic liquid level meter is used for detecting the height of the liquid level, then whether the feeding is carried out or not is controlled by the control device, and the stirred lime emulsion is fed to the site by adopting a circulating feed-discharge branch pipe through a feeding pump;
the water supply device comprises: receiving new industrial water, and configuring a water replenishing flow meter, a water replenishing valve 12, a water replenishing upper inlet valve 13 and a water replenishing lower inlet valve 14;
the air used by the device is compressed air for instruments, and the dried compressed air is purified by the air triple piece and then supplied to the powder supply machine.
Apparatus overview and Overall operation
1 apparatus composition
The device can be divided into four parts according to the working procedure state: a lime powder storage device (stock bin) and a lime powder conveying device; dissolving lime; a diluting and feeding device.
1.1 lime powder storage device (hereinafter referred to as bunker)
The lime powder is conveyed to the storage bin by a special tank car through a conveying pipeline. The upper part of the storage bin is provided with a dust removal respirator, so that the powder can smoothly enter the storage bin and cannot cause secondary pollution to the environment, and the rotation-resistant material level meter is additionally arranged on the top of the storage bin, so that the lowest storage capacity and the highest storage capacity of the powder can be accurately reported, and a worker is prompted whether to convey the powder into the storage bin or not.
In order to prevent lime powder from hardening in the bin and influencing the accurate supply of the powder, two cone parts below the bin are respectively provided with two vibrating motors, and the vibrating motors are started during blanking to ensure that the powder is not easy to adhere to the bin wall. In addition, the lower part of the bin is also provided with a floating screening type bin vibrating head, so that the powder can smoothly enter the powder quantitative feeder through the floating screening type bin vibrating head.
1.2 powder quantitative supply machine
The powder quantitative supply machine can quantitatively add the powder into the digester according to the process requirements.
1.3 cyclone digester
The cyclone slaker is an important device in the device, and powder entering the slaker is mixed with a certain amount of water, and the mixture is slaked and mixed to finally prepare lime emulsion with a certain concentration.
1.4 dissolving tank and feeding device
The dissolving tank is used for containing lime emulsion, and water can be added to adjust the concentration of the lime emulsion. The dissolving tank is provided with a stirrer and an ultrasonic liquid level meter, and the stirrer is used for stirring liquid so that the liquid cannot form sediment; the ultrasonic liquid level meter is used for detecting the height of the liquid level, then the control device is used for controlling whether the feeding is carried out, and the stirred lime emulsion is fed to the site by adopting a circulating feeding and discharging branch pipe through a pump.
1.5 Water supply installation
The new industrial water is used in the device to ensure the service life of the valve, the flowmeter and the like, and the flowmeter is arranged on the pipeline to observe whether the water quantity in the pipeline meets the process requirement at any time. Water supply point: the diameter of 2-path water supply in the digester is DN 50.
1.6 air supply device
The air used by the device is compressed air for instruments, and the dried compressed air is purified by the air triple piece and then supplied to the powder supply machine.
2 working sequence of the device
2.1 addition of the powder
Powder of the storage bin is pumped into the storage bin through a conveying pipeline by a special tank car, when the powder reaches an upper limit H, an alarm is displayed on a touch screen of a PLC control cabinet, and the feeding is stopped at the moment; starting a dust removal respirator fan at the same time of feeding, and stopping the fan after the feeding is stopped; after the feeding is stopped, the respirator vibrates the motor and runs for three minutes and then stops. When the powder in the storage bin is used and is lower than the lower limit M, the touch screen displays an alarm, and the feeding is carried out again until the powder is added to the upper limit H.
2.2 addition of powder in a stock bin and preparation of lime milk
2 vibrating motors on the bin and the vibrating motor on the vibrating head are started, the slide valve is opened, the powder quantitative conveyor is started, the powder enters the cyclone digester from the bin through the slide valve and the powder quantitative conveyor at the moment, the water supply point on the cyclone digester supplies water at the same time, and lime milk prepared by full mixing flows into the dissolving tank.
2.3 dissolution and dilution
2.3.1 as long as the liquid level in the dissolving tank is above the stirring liquid level, the stirrer starts to operate, otherwise, the stirrer stops.
2.3.2 when the concentration of lime milk in the dissolving tank is too high (higher than the process requirement), the water supply amount can be increased (or the powder supply amount can be reduced).
2.3.3 Pump on is controlled by the level of liquid in the dissolving tank, i.e. when the liquid level in the dissolving tank reaches the pump on level. The pump is started, the pump is started by manual and automatic optional control, and the pump is always in a working state as long as the liquid level is higher than the liquid level of the pump, unless the process needs to be stopped.
2.3.4 the lime milk flowing out from the cyclone digester flows into the dissolving tank, when the dissolving tank reaches the highest liquid level H, the powder quantitative feeder stops feeding, and the water is stopped.
2.3.6 the feeding pump is started, and the prepared lime milk is quantitatively conveyed to the feeding point of the water treatment facility.
(II) confirming and operating the proportioning of the lime milk preparation device:
1. determining the proportion, the powder supply amount and the water inflow amount
The method comprises the following steps: adding slaked lime Ca (OH) per hour2The mass of the powder is G2, the solubility of the prepared lime emulsion is 10 percent,
1.1 the total mass of the dilution water was determined to be G1 from G2 in terms of G2/(G1 + G2) =10%,
g1 is the sum of digester feed water G1a and dissolving tank feed water G1 b.
1.2 obtaining digester feed water G1a according to G2/(G1 a + G2) =20%
1.3 obtaining dissolving tank feed water G1b in accordance with G1= G1a + G1b
1.4 the volume V (L) of slaked lime powder with a mass G2 (kg) is determined for V = G2/ρ, where ρ is the density of lime powder (kg/L).
1.5 adding slaked lime powder with the mass of G2 in volume V per hour, and calculating the spiral output rotating speed n (r/min) of the powder supply machine.
n=V/1.5/60
2. The mixture ratio is as follows:
a lime emulsion having a solubility of 10% and a slaked lime density of 0.75Kg/L was prepared using a slaked lime Ca (OH) 2 mass of 3000Kg per hour.
Then, according to 1, the parameters are calculated as follows:
G2=3000kg G1=27000kg G1a=12000kg G1b=15000kg
V=4000L n=44.44r/min。
the device for treating the industrial wastewater in the fifth stage of the Taigang sewage has the treatment capacity of 16 ten thousand tons per day, and adopts the technology of a high-density sedimentation tank and a V-shaped filter, and the lime milk preparation and addition device can be used for preparing and adding lime milk, the lime milk addition amount can be automatically adjusted according to the water quality and the water quantity of incoming water, the fault rate is low, the operation is stable and reliable, the preparation rate is high, the flocculation and precipitation effects of wastewater treatment are effectively improved, and the quality of the outgoing water is stable and reaches the standard.
Claims (8)
1. The utility model provides a waste water treatment lime breast preparation and throwing feeder apparatus which characterized in that includes: the system comprises a storage bin, a lime milk preparation device, a dissolving and diluting device and a water supply device;
the feed bin has the following functions: the lime powder is conveyed to a storage bin by a tank car through a conveying pipeline; the upper part of the bin is provided with a dust removal respirator, so that the powder can smoothly enter the bin without causing secondary pollution to the environment, and the rotation-resistant material level meter is additionally arranged on the top of the bin and can accurately monitor the lowest storage capacity and the highest storage capacity of the powder, so that a worker is prompted whether to convey the powder into the bin or not; two vibration motors are respectively arranged on the two conical parts below the storage bin, and the vibration motors are started during blanking, so that powder is not easy to adhere to the wall of the storage bin; the lower part of the bin is also provided with a floating screening type bin vibrating head, so that the powder can smoothly enter the powder quantitative feeder through the floating screening type bin vibrating head;
the lime milk preparation device comprises a powder quantitative feeder and a cyclone digester; the powder quantitative supply machine can quantitatively add the powder into the digester according to the process requirement; the cyclone digester is important equipment in the device, powder entering the digester is mixed with a certain amount of water, and the mixture is digested and mixed to finally prepare lime emulsion;
the dissolving and diluting device comprises a dissolving tank, a stirrer and a feeding pump and is used for dissolving, diluting and feeding lime emulsion;
the dissolving tank is used for containing lime emulsion, and simultaneously can be used for adjusting the concentration of the lime emulsion by adding water, a stirrer and an ultrasonic liquid level meter are arranged on the dissolving tank, and the stirrer is used for stirring liquid so that the liquid cannot form precipitates; the ultrasonic liquid level meter is used for detecting the height of the liquid level, then whether the feeding is carried out or not is controlled by the control device, and the stirred lime emulsion is fed to the site by adopting a circulating feed-discharge branch pipe through a feeding pump;
the water supply device comprises: receiving new industrial water, and configuring a water replenishing flow meter, a water replenishing valve, a water replenishing upper valve and a water replenishing lower valve;
the air used by the device is compressed air for instruments, and the dried compressed air is purified by the air triple piece and then supplied to the powder supply machine.
2. The lime milk preparation and adding device for wastewater treatment according to claim 1, characterized in that: the feed bin adopts enclosed construction, carbon steel product, installs dust removal respirator on it, hinders 3 of rotary charge level indicator, installs 4 vibrating motor, and 2 vibrating heads of feed bin are equipped with 1 vibrating motor on the vibrating head.
3. The lime milk preparation and adding device for wastewater treatment according to claim 2, characterized in that: the effective volume of the silo: 100m3The container is a closed pressureless container by adopting a middle supporting mode; the storage bin is used for storing lime powder below 200 meshes; the bin vibrating head can vibrate randomly, and has a screening function, so that hardened blocky materials cannot enter the powder feeder; a material blocker is arranged in the vibration head of the storage bin and used for adjusting the blanking speed;
the top end of the storage bin is provided with a dust removal respirator which is used for ventilating and recovering leaked dust so as to prevent secondary pollution, and after the feeding is finished, a vibration motor on the respirator is started to discharge the dust in the filter bag into the storage bin;
4 vibration motors are arranged, and 2 vibration motors are respectively arranged on cones on the storage bin; the stock bin vibrating motors are 2 in total, and 1 vibrating motor is respectively arranged on the stock bin vibrating head.
4. The lime milk preparation and adding device for wastewater treatment according to claim 2, characterized in that: the slide valve is arranged at the bottom of the loosening device and comprises a rotating hand wheel, and the gate plate is driven by a screw rod to move to an ideal position in the gate groove, so that the opening and closing work of the discharge of the storage bin is realized;
the main technical properties are as follows: a. the opening and closing stroke is 280 mm; b. adaptation medium: a powdery material.
5. The lime milk preparation and adding device for wastewater treatment according to claim 1, characterized in that: in the lime milk preparation device, the working principle of the powder quantitative supply machine is as follows: firstly, pressing down a starting switch, and driving a motor to transmit power to a speed reducer; secondly, the screw shaft rotates clockwise, and the materials are pushed into the digester; regulating the frequency of the motor without the speed reducer during operation to change the supply amount; the working principle of the cyclone digester is as follows: the spray head and tangent water inlet structure inside the cyclone digester make lime and water rotate to mix and digest the material and water fully and uniformly, so as to achieve the aim of preparing 'emulsion'; the digester adopts a carbon steel anti-corrosion structure.
6. The lime milk preparation and adding device for wastewater treatment according to claim 1, characterized in that: in the dissolving and diluting device, the middle of a base of a dissolving tank stirrer adopts two-stage middle support, a speed reducer is connected with a transmission shaft by a roller chain coupler, the stirrer is a vertically-installed stirrer for a tank and is installed on a steel frame at the top of the stirring tank, a main shaft and blades are directly inserted into the tank for stirring, and the central line of the main shaft is ensured to be on a plumb line during installation.
7. The lime milk preparation and adding device for wastewater treatment according to claim 6, characterized in that: the main technical performance parameters of the dissolving tank stirrer are as follows: motor power: 7.5 kw; impeller diameter: 1050mm double layers; impeller rotating speed: 42 rpm;
the dissolution tank has 2, single effective volumes: 30m3A carbon steel anti-corrosion structure is adopted;
the feeding pump adopts a screw pump with the flow rate of 20m3/h。
8. The use method of the wastewater treatment lime milk preparation and adding device as claimed in any one of claims 1 to 7 is characterized by comprising the following steps:
(1) addition of powder
Powder of the storage bin is pumped into the storage bin through a conveying pipeline by a special tank car, when the powder reaches an upper limit H, an alarm is displayed on a touch screen of a PLC control cabinet, and the feeding is stopped at the moment; starting a dust removal respirator fan at the same time of feeding, and stopping the fan after the feeding is stopped; stopping the respirator vibration motor after the feeding is stopped and running for three minutes; when the use of the powder in the storage bin is lower than the lower limit M, displaying an alarm on the touch screen, and feeding again until the upper limit H is added;
(2) feeding of bin powder and preparation of lime milk
Starting 2 vibration motors on the bin and a vibration motor on a vibration head, opening a slide valve, starting a powder quantitative conveyor at the same time, enabling the powder to enter a cyclone digester from the bin through the slide valve and the powder quantitative conveyor, supplying water to a water supply point on the cyclone digester simultaneously, and making lime milk into the lime milk through full mixing and flowing into a dissolving tank;
(3) dissolution and dilution
As long as the liquid level in the dissolving tank is above the stirring liquid level, starting the stirrer to operate, otherwise, stopping the stirrer;
when the concentration of lime milk in the dissolving tank is higher than the process requirement, increasing the water supply amount or reducing the powder supply amount;
the start of the feeding pump is controlled by the liquid level height in the dissolving tank, namely when the liquid level in the dissolving tank reaches the pump start position; starting the pump, wherein the pump is started by manual and automatic optional control, and the pump is always in a working state as long as the liquid level is higher than the liquid level of the pump, unless the process needs to be stopped;
the lime milk flowing out of the cyclone digester flows into the dissolving tank, and when the dissolving tank reaches the highest liquid level H, the powder quantitative feeder stops feeding and stops water supply;
and starting the feeding pump, and quantitatively conveying the prepared lime milk to a feeding point of a water treatment facility.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110205401.0A CN112978885A (en) | 2021-02-24 | 2021-02-24 | Wastewater treatment lime milk preparation and adding device |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110205401.0A CN112978885A (en) | 2021-02-24 | 2021-02-24 | Wastewater treatment lime milk preparation and adding device |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005111403A (en) * | 2003-10-09 | 2005-04-28 | Japan Organo Co Ltd | Method for treating dust of slaked lime dissolving device and its apparatus |
| CN101289288A (en) * | 2008-06-10 | 2008-10-22 | 丹东北方环保工程有限公司 | Device for preparing large-scale lime cream |
| CN102101714A (en) * | 2010-12-16 | 2011-06-22 | 北京中兵北方环境科技发展有限责任公司 | Device and method for quantitatively charging lime automatically |
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2021
- 2021-02-24 CN CN202110205401.0A patent/CN112978885A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005111403A (en) * | 2003-10-09 | 2005-04-28 | Japan Organo Co Ltd | Method for treating dust of slaked lime dissolving device and its apparatus |
| CN101289288A (en) * | 2008-06-10 | 2008-10-22 | 丹东北方环保工程有限公司 | Device for preparing large-scale lime cream |
| CN102101714A (en) * | 2010-12-16 | 2011-06-22 | 北京中兵北方环境科技发展有限责任公司 | Device and method for quantitatively charging lime automatically |
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