CN201148384Y - An automatic metering and preparation device for powdered lime - Google Patents

Abstract

The utility model provides an automatic metering and preparation device for powdered lime, which is characterized in that: the lime silo is provided with a pipeline, the top of the silo is equipped with a bag filter and a breathing valve, and the lower part of the cone bucket passes through a flange and an anti-cavitation vibration device. The upper part is connected, and the lower part of the anti-cavitation vibration device is connected with the volumetric metering screw feeder. The volumetric metering screw feeder is provided with an inlet and an outlet, and the outlet is connected with the lime milk mixing box. The utility model has the advantages of reliable performance, accurate ingredients, cleanness, unmanned supervision on site, effectively improving the lime utilization rate in the lime emulsification process, preventing lime dust from flying, and providing a lime milk preparation mechanism related to concentration and flow rate, so that the input of lime milk The amount of addition can be changed according to the change of water quality and water quantity, so as to ensure the quality of effluent water. The whole device has simple combination and complete functions, and it can also cooperate with related equipment to realize all mechanized and automatic operations of lime powder in the process of conveying, measuring and preparing.

Description

An automatic metering and preparation device for powdered lime

technical field

The utility model relates to the technical field of water treatment in the field of environmental protection, in particular to an automatic metering and preparation device for powdered lime in the water purification or waste water treatment process.

Background technique

Lime treatment is an effective water treatment process with stable effluent quality, which can effectively remove organic matter and reduce hardness and turbidity. At present, the lime treatment of water is mainly used in the softening treatment of high temporary hard water and the reuse of urban sewage. The lime treatment device has the advantages of easy use, low operating cost, and no pollution to natural water bodies.

At present, in the water treatment process of lime, the dosing method of making lime emulsion (and lime emulsification) with uniform concentration is usually adopted. The lime plant is generally composed of a lime silo, a vibrating device, a screw feeder and a solution dispensing box. In the process of lime powder transportation, measurement, and preparation, problems such as blockage, dust flying, and environmental pollution are most likely to occur, resulting in lime Uneven powder ingredients, equipment maintenance and management problems. At the same time, the dissolving and preparing of lime has the problem of low lime utilization rate, which will affect the water treatment effect.

Therefore, in view of the problems existing in the lime water treatment process, on the one hand, it is necessary to make a necessary selection of lime powder for water treatment, and on the other hand, it is necessary to improve the equipment combination structure of the lime powder transportation, metering, and preparation devices to improve the operating efficiency of the device and stability.

Contents of the invention

The purpose of the utility model is to provide an automatic metering and preparation device for powdered lime, so as to effectively improve the utilization rate of lime in the lime emulsification process, prevent lime dust from flying, and reduce labor intensity.

The purpose of this utility model is achieved through the following technical approaches: an automatic metering and preparation device for powdered lime, which mainly includes a lime silo, a cone bucket is installed at the bottom of the silo, and an anti-cavity vibration device is installed at the bottom of the cone bucket. It is characterized in that: lime The silo is equipped with pipelines, and the top of the silo is equipped with a bag filter and a breathing valve. The lower part of the cone bucket is connected to the upper part of the anti-cavitation vibration device through a flange, and the lower part of the anti-cavitation vibration device is connected to the volumetric metering screw feeder. The type metering screw feeder is equipped with an inlet and an outlet, and the outlet is connected with the lime milk mixing box.

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

1. Realized all the mechanization and automatic operation of powdered lime in the process of transportation, measurement and preparation, and improved the accuracy of the amount of lime mixed;

2. The anti-cavity vibration device adopted is strong and durable, and the internal second-stage baffle vibrates with different amplitudes to ensure the continuous flow of lime; there are only two wearing parts inside the feeder, and it has a unique mixing adjustment screw , so that the lime can fill the feeding screw to ensure the accuracy of ±1-1.5%;

3. The volumetric metering screw feeder used is equipped with a frequency conversion motor, which can adjust the rotation speed of the main metering screw through the frequency conversion motor to adjust the dosing amount;

4. The lime milk preparation device can adopt the constant concentration and variable flow lime milk preparation device and the constant flow and variable concentration lime milk preparation device according to the lime milk flow rate, so that the dosage of lime milk can be changed according to the change of water quality and water quantity. Guarantees the quality of effluent water;

5. Solve the problems of ratholes in the lime powder silo, poor flow of lime powder caused by arch bridges, and deformation caused by manual knocking on the outside of the lime silo. And according to the water flow and water quality of the clarifier, adjust the frequency converter of the volumetric metering screw feeder to adjust the feeding amount of lime powder;

6. The combination of equipment is simple, continuous, complete and pollution-free. Equipment maintenance and management are simple. The utility model can also be applied to other industries using materials similar in properties to lime powder.

Description of drawings

Fig. 1 is the structural representation of the utility model;

Fig. 2 is the structural representation of the anti-cavitation vibration device in the utility model;

Fig. 3 is the structural representation of metering screw feeder in the utility model;

Fig. 4 is the milk of lime preparation mechanism of the slaked lime powder concentration in the utility model;

Fig. 5 is the milk of lime preparation mechanism of quicklime powder concentration in the utility model;

Figure 6 is a schematic diagram of the operation of the utility model.

Detailed ways

Below in conjunction with accompanying drawing and embodiment the utility model is further described.

The utility model is an automatic metering and preparation device for powdered lime, which mainly includes a lime silo 2, a cone bucket 3 is installed at the lower part of the silo, and an anti-cavitation vibration device 4 is installed at the bottom of the cone bucket 3. The feature is that the lime silo 2 is equipped with Pipeline 1, bag filter 8 and breathing valve 9 are installed on the top of the silo, the lower part of the cone bucket 3 is connected to the upper part of the anti-cavitation vibration device 4 through the flange, and the lower part of the anti-cavitation vibration device 4 is connected to the volumetric metering screw feeder 5 Connected, the volumetric metering screw feeder 5 is provided with a feed port 25 and a discharge port 28, and the discharge port 28 is connected with the milk of lime mixing box 6. The volumetric metering screw feeder 5 described in the implementation has a hopper 12, the upper end of the hopper 12 is provided with a feed inlet 25 and a miniature bag filter 29, the lower end of the hopper 12 is provided with a main metering screw 26, and the outside of the hopper 12 A variable frequency motor 27 is provided, the output end of the variable frequency motor 27 is connected to one end of the main metering screw 26, and the other end of the main metering screw 26 is provided with a discharge port 28; the lime silo 2 is located on the support structure 10, supported The structure 10 adopts the type of steel outrigger support or floor slab hoisting. The straight barrel part of the lime silo 2 adopts a cylindrical shape, and the lower part of the straight barrel part of the lime silo 2 is installed with a cone bucket ₃ . 4 times, the cone angle of the cone bucket 3 is greater than 45°, and the lime silo 2 is made of carbon steel; the cavity vibration device 4 has a feeding hopper body 20, and the feeding hopper body 20 is equipped with a primary baffle 21 and an adjustable baffle 22 , the outside of the feed hopper body 20 is provided with a drive mechanism 23, the feed hopper body 20 is a cone 3 with an inclination angle of 30-55°, the lower end outlet of the cone 3 is provided with a discharge port 24, and the outlet of the cone 3 is provided with a first-level Baffle plate 21, adjustable baffle plate 22 is arranged on the top of discharge port 24, discharge port 24 is a flexible pipe; lime milk mixing box 6 is a cone bottom shape, adopts carbon steel material, and agitator 15 and The top-mounted magnetic flap liquid level gauge 16 and the lime emulsion outlet pipe 17 are arranged at the lower part of the lime mixing tank 6 . In order to achieve a better lime powder emulsion preparation effect, the embodiment connects the lime milk mixing box 6 with the lime powder concentration lime milk preparation mechanism, and provides the embodiment of two kinds of raw and slaked lime preparation mechanisms in the accompanying drawing, described Lime powder concentration lime milk preparation mechanism is that the upper end of the milk of lime mixing box 6 is provided with a feed pipe 38, the milk of lime mixing box 6 is connected with the auxiliary milk of lime box 30 through a pipeline 31, the milk of lime auxiliary box 30 is made of carbon steel, and the milk of lime The auxiliary tank 30 is provided with a liquid level float valve 32 that can control the liquid level; the described lime powder concentration lime milk preparation mechanism is that the lime milk stirring box 6 is connected with a lime slaking box 33 through a pipeline 31, and the lime slaking box 33 passes The pipeline 35 is connected with the lime milk auxiliary tank 30, and the lime slaking tank 33 is provided with an agitator 34 and a feeding pipe 38, and the lower part of the lime slaking tank 33 is equipped with a slag outlet 36. In the above two embodiments, when the lime dissolving adopts the constant concentration and variable flow rate preparation mechanism (suitable for the flow rate<10m ³ /h), the lime milk tank adopts the type of lime milk stirring tank. When the lime dissolution adopts the constant flow and variable concentration preparation mechanism (applicable to flow ≥ 10m ³ /h), the combination of lime milk stirring box and lime milk auxiliary box is used for the dissolution of slaked lime powder; the lime slaking box is used for the dissolution of quick lime powder , The combination of lime milk mixing box and lime milk auxiliary box.

The volumetric metering screw feeder and the associated hopper described in the utility model, and the frequency conversion motor and lime milk box that are equipped are commercially available prior art. The anti-cavitation vibration device 4, bag dust removal described in the utility model Device 8 and breather valve 9, miniature bag filter 29, main metering screw rod 26, variable frequency motor 27 and some other parts and electrical equipment are all commercially available prior art, do not describe in detail here.

In the present utility model, the recommended slaked lime (Ca(OH) ₂ ) for water treatment adopts the superior product in the industry, and its quality is shown in the following table:

project data Commodity form dry powder Exterior White Appearance of solution after dissolving in distilled water and removing insoluble matter colorless Water-soluble Ca(OH) ₂ content at least 80% by weight Mg ²⁺ content up to 1.5% by weight SO ₄ ²⁺ content up to 1% Sieve residue 0.63mm without 0.09mm up to 10% by weight

In the utility model, the recommended quicklime (CaO) for water treatment adopts the industry's first-class product, and its quality is shown in the following table:

project unit data CaO content % ＞85 MgO content % <3 P content % ＜0.01 S content % ＜0.5

The effect will be further described below in conjunction with the accompanying drawings and specific operations.

As shown in Figure 1, the powdery lime automatic metering preparation device of the present utility model is mainly composed of lime silo 2, anti-cavitation vibration device 4, volumetric metering screw feeder 5 and lime milk 6, lime milk auxiliary box 30, lime Ripening case 33 forms.

Lime powder is generally transported to the site by truck tanker, and sent to the lime silo 2 by compressed air through the pipeline 1. In order to control fly ash, a bag filter 8 is installed on the top of the lime silo 2. When the lime silo 2 feeds The air is discharged after dust removal. The top of the lime silo 2 is provided with a breather valve 9 to ensure and automatically adjust the normal pressure in the lime silo 2 . The straight barrel part of the lime silo 2 is in the form of a cylinder, the lower part is equipped with a cone bucket 3, the height H of the straight barrel is 2 to 4 times the diameter _D1 , and the cone angle of the cone bucket 3 is greater than 45°. The volume of the lime silo 5 is not less than 15 days of lime powder reserves, and is made of carbon steel. The support structure 10 of the lime silo 2 adopts the type of steel outrigger support or floor slab hoisting. The straight barrel part of the lime silo 2 and the cone bucket 3 part coincide with the axis of the anti-cavitation vibration device 4 .

The lime powder is discharged from the cone bucket 3 of the lime silo 2 through the anti-cavitation vibration device 4 . The anti-cavity vibration device 4 is powered by the electric control box 11, and the generated vibration makes the lime powder in the lime silo 2 unblocked for a long time and circulates smoothly, while avoiding the occurrence of rat holes and arch bridges in the lime silo 2. The selected diameter D ₂ of the anti-cavitation vibration device 4 is 1/2 of the diameter D ₁ of the straight barrel part of the lime silo 2 . The lime powder enters the volumetric metering screw feeder 5 through the anti-cavitation vibration device 4 . The hopper 12 of the volumetric metering screw feeder 5 body is equipped with a capacitive material level switch 13, which is used to cooperate with the anti-cavitation vibrator 4 to meet the continuous supply of lime powder for the feeder, and the feeding is controlled by the frequency conversion device 14 Lime powder conveying capacity of machine 5. The lime powder enters the lime milk box from the volumetric metering screw feeder 5 .

When the lime dissolving adopts the lime milk preparation device with constant concentration and variable flow rate, the type of lime milk stirring box 6 is adopted. An agitator 15 is arranged in the milk of lime mixing box 6, and the material of the agitator 15 is 316 stainless steel. A top-mounted magnetic flap liquid level gauge 16 is installed in the milk of lime mixing box 6 . The milk of lime mixing tank 6 is made of carbon steel with a volume of 5-10 m ³ considering the exothermic process of lime dissolving in water. Lime powder is fully reacted in the lime milk mixing tank 6 to become lime milk, and the lime milk outlet pipe 17 is arranged at the lower part of the lime mixing tank 6, which is the same pipeline as the sewage pipe, and is transported to the place of use by the lime milk pump 7, and a part of the lime milk It flows back into the lime mixing tank 6 through the pipeline 18, so that the lime milk is fully mixed evenly, and the water inflow is controlled by the control valve 19 at the same time.

As shown in FIG. 2 , the anti-cavitation vibration device 4 of the present invention is mainly composed of a feeding hopper body 20 , a primary baffle 21 , an adjustable baffle 22 , and a driving mechanism 23 . The feeding hopper body 20 is a cone structure with an inclination angle of 45°, and the vibration is mainly generated by its own driving mechanism 23 . The discharge port 24 is a flexible pipe connected to the lower volumetric screw feeder 5 . The anti-cavitation vibration device 4 of the present utility model adopts the unique design of the secondary baffle, that is, while the primary baffle is set at the key part of the silo that is easy to be arched - the outlet of the silo, and close to the top of the powder outlet An adjustable baffle 22 is installed. This special baffle is designed to transmit the vibration to the interior of the lime silo 2 and the outlet 24, realizing the secondary vibration of the lime powder and successfully solving the problem of stacking and vibration caused by vibration. The load generated by the upper powder material avoids the problems of agglomeration and poor transportation during the use of lime powder.

The anti-cavity vibration device 4 of the utility model is selected as a finalized product, and the selected diameter _D2 is 1/2 of the diameter _D1 of the straight barrel part of the lime silo 2, and its specifications are: 1 foot, 2 feet, 3 feet, 4 feet , 5 feet, 6 feet, 7 feet, 8 feet, 9 feet, 10 feet, 11 feet, 12 feet. The material of anti-cavitation vibration device 4 adopts carbon steel, the inside is coated with single-layer paint, and the outside is coated with primer and blue enamel paint.

As shown in Figure 3, the volumetric metering screw feeder 5 of the present invention is mainly composed of a feed inlet 25, a hopper 12, a main metering screw 26, a frequency conversion motor 27, a discharge port 28, a capacitive level switch 13, a miniature The bag filter is composed of 29. The volume of the hopper 12 is 0.5 cubic feet, and is equipped with a capacitive material level switch 13, which is used to coordinate with the anti-cavitation vibrator 4 to meet the continuous supply of materials for the feeder. When the lime powder is at the low position of the hopper 12, the material level switch 13-2 is interlocked with the anti-cavitation vibrator 4 to vibrate the anti-cavitation vibrator 4, and the lime powder is sent into the volumetric metering screw feeder 5 until the lime powder When the material is in the high position of the hopper 2, the material level switch 13-1 is interlocked with the anti-cavitation vibrator 4 to stop the vibration of the anti-cavitation vibrator 4. The top of the hopper 12 is provided with a micro-bag dust collector 29 to clean up the dust. The rotation speed of the main metering screw 26 is regulated by the frequency conversion motor 27, thereby adjusting the dosing amount. Lime powder is discharged into the lime milk box from discharge port 28. The volumetric metering screw feeder 5 of the utility model is made of 304 stainless steel.

The volumetric metering screw feeder 5 of the utility model selects finalized products, and the type selection is mainly carried out according to the required dosage, and the specific specifications are divided into 1 inch, 1.5 inches, and 2 inches according to the diameter of the main metering screw 26. , 3 inches, 4 inches, 6 inches.

As shown in FIG. 4 , the constant-flow variable-concentration lime milk preparation device for slaked lime powder of the present utility model is mainly composed of a lime milk stirring box 6 and a lime milk auxiliary box 30 . Lime powder enters the milk of lime mixing tank 6 from the discharge port 28 of the volumetric metering screw feeder 5, and dissolves into milk of lime in the milk of lime mixing tank 6. The milk of lime auxiliary tank 30 supplies water to the milk of lime mixing tank 6 through the bottom of the tank together with the pipe 31, thereby ensuring sufficient water supply to the milk of lime mixing tank 6 and controlling the liquid level of the mixing tank. The lime milk auxiliary tank 30 has a volume of not less than 0.5m ³ and is made of carbon steel. The water level is controlled by a liquid level float valve 32 inside. The milk of lime mixing box 6 adopts a cone bottom structure and is made of carbon steel, and an agitator 15 is arranged inside, and the material of the agitator 15 is 316 stainless steel. The lime milk mixing tank 6 has a volume of 2m ³ in consideration of the short exothermic process of dissolving slaked lime in water. The lime milk outlet pipe is arranged on the lower part of the lime mixing tank 6, which is the same pipeline as the sewage discharge pipe, and is transported to the place of use by the lime milk pump 7.

As shown in Figure 5, the constant flow and variable concentration lime milk preparation device of the quicklime powder of the present invention is mainly composed of a lime milk stirring box 6, a lime milk auxiliary box 30 and a lime slaking box 33. The lime milk auxiliary box 30 is connected with the lime slaking box 33 through the bottom of the box together with the pipe 31 , and the lime slaking box 33 is connected with the lime milk stirring box 6 through the bottom of the box together with the pipe 35 . The quicklime powder enters the lime slaking tank 33 from the discharge port 28 of the volumetric metering screw feeder 5, and after stirring in the lime slaking tank 33 to make mature lime, it enters the lime milk mixing tank 6 and stirs evenly, and the dissolving water flows from the Lime milk auxiliary box 30 enters in the lime slaking box 33. The lime slaking tank 33 is made of carbon steel with a volume of 5m ³ , taking into account the slaking process of quicklime in water. The stirrer 34 is made of 316 stainless steel and has a slag outlet 36 at the bottom. The lime milk auxiliary tank 30 has a volume of not less than 0.5m ³ and is made of carbon steel. The water level is controlled by a liquid level float valve 32 inside. The milk of lime mixing box 6 adopts a cone bottom structure and is made of carbon steel, and an agitator 15 is arranged inside, and the material of the agitator 15 is 316 stainless steel. The lime milk mixing tank 6 has a volume of 1.5m ³ . The lime milk outlet pipe is arranged on the lower part of the lime mixing tank 6, which is the same pipeline as the sewage discharge pipe, and is transported to the place of use by the lime milk pump 7.

As shown in Figure 6, the specific operation of the powdered lime automatic metering preparation device of the present invention is implemented as follows: when charging the lime silo 2, the discharge pipe of the lime transport vehicle is docked with the lime silo 2 feed pipe 1 ; Turn on the bag filter 8 exhaust motor at the top of the lime silo 2; open the valve 1 of the feed pipe 1 of the lime silo 2, and use the power to send the lime powder in the transport vehicle into the lime silo 2 until the powder in the vehicle is conveyed, and then close Lime silo 2 feed valve, close the bag filter 8 exhaust motor, turn on the dust cleaning motor, after clearing the flying dust on the filter bag 8, the process ends.

When the lime milk preparation and transportation are in progress, before the device is started, the lime storage in the lime silo 2 is guaranteed to be above the bottom of the cone, and the powder level in the volumetric metering screw feeder 5 is at a high level; open the lime milk auxiliary box 30 to feed The water valve allows clean water to enter the lime milk auxiliary tank 30 and the lime milk mixing tank 6 through the water level float valve 32 until the normal water level; open the lime milk mixing tank 6 and the agitator 15, and when the normal speed is reached, open the lime milk mixing tank 6 The outlet electric ball valve and the lime milk pump 7 inlet ball valve fill the water into the lime milk pump 7; start the lime milk pump 7, and when it operates normally, open the lime milk pump 7 outlet electric ball valve to send water to the dosing point; start volume Type metering screw feeder 5, the lime powder is quantitatively sent into lime milk mixing box 6. According to the control signal, the rotational speed of the volumetric metering screw feeder 5 is changed through the frequency conversion device 14, so that the amount of lime powder added varies with the control signal. When the powder material level in the hopper 12 of the volumetric metering screw feeder is at a low level, the anti-cavity vibrator 4 of the lime silo 2 vibrates, and the lime powder is sent into the hopper 12 of the volumetric metering screw feeder 5 until the hopper 12 When the powder material level was high, the anti-cavitation vibrator 4 stopped.

When the lime milk pipe needs to be flushed for some reason, stop the volume metering screw feeder 5 and the lime milk mixing box 6 agitator 15, close the electric ball valve at the outlet of the lime milk mixing box 6, open the electric ball valve on the clean water pipe, and clean water enters The lime milk pipe is flushed until the flushing is completed, the electric ball valve on the clear water pipe is closed, and the outlet electric ball valve of the lime milk pump 7 is closed.

Claims (7)

1. An automatic metering and preparation device for powdery lime, mainly comprising a lime silo (2), a cone bucket (3) is installed at the bottom of the silo, and an anti-cavitation vibration device (4) is installed at the bottom of the cone bucket (3), characterized in that: The lime silo (2) is equipped with a pipe (1), and a bag filter (8) and a breathing valve (9) are installed on the top of the silo. The lower part of the cone bucket (3) passes through the flange and the upper part of the anti-cavitation vibration device (4). Connected, the lower part of the anti-cavitation vibration device (4) is connected with the volumetric metering screw feeder (5), and the volumetric metering screw feeder (5) is provided with an inlet (25) and an outlet (28), This discharge port (28) links to each other with lime milk mixing box (6). 2. A powdery lime automatic metering and preparation device according to claim 1, characterized in that: said volumetric metering screw feeder (5) has a hopper (12), and the upper end of the hopper (12) is provided with Feed inlet (25) and a miniature cloth bag filter (29), the lower end of hopper (12) is provided with main metering screw (26), and the outside of hopper (12) is provided with frequency conversion motor (27), frequency conversion motor (27) The output end of the main metering screw rod (26) is connected with one end, and the other end of the main metering screw rod (26) is provided with a discharge port (28). 3. An automatic metering and preparation device for powdered lime according to claim 1, characterized in that: the lime silo (2) is located on the support structure (10), and the support structure (10) adopts a steel leg support Or the type of floor hoisting, the straight barrel part of the lime silo (2) adopts a cylindrical shape, and the lower part of the straight barrel part of the lime silo (2) is equipped with a cone bucket (3), and the straight barrel height (H) is the diameter (D ₁₎ The cone angle of the cone bucket (3) is greater than 45°, and the lime silo (2) is made of carbon steel; the anti-cavitation vibration device (4) has a feed hopper body (20), and the feed hopper body (20) Equipped with a primary baffle (21) and an adjustable baffle (22), the outside of the feeding hopper (20) is provided with a drive mechanism (23), and the feeding hopper (20) is a cone ( 3), the outlet of the lower end of the cone (3) is provided with a discharge opening (24), the outlet of the cone (3) is provided with a primary baffle (21), and an adjustable baffle (24) is arranged above the discharge opening (24) 22), the discharge port (24) is a flexible connecting pipe. 4. The powdered lime automatic metering and preparation device according to claim 1, characterized in that: the milk of lime mixing box (6) is a cone bottom shape, made of carbon steel, and an agitator ( 15) and the top-mounted magnetic flap liquid level gauge (16), the lime emulsion outlet pipe (17) is arranged on the lime stirring tank (6) bottom. 5. The powdered lime automatic metering and preparation device according to claim 1, characterized in that the lime milk stirring box (6) is connected with the lime powder concentration lime milk preparation mechanism. 6. The powdered lime automatic metering and preparation device according to claim 5, characterized in that: said lime powder concentration lime milk preparation mechanism is that a feed pipe (38) is provided at the upper end of the lime milk mixing box (6), The lime milk mixing tank (6) is connected to the lime milk auxiliary tank (30) through the pipeline (31). Float valve (32). 7. The powdered lime automatic metering and preparation device according to claim 5, characterized in that: said lime powder concentration lime milk preparation mechanism is that the lime milk stirring tank (6) is connected with a lime slaking tank through a pipeline (31) (33) is connected, and this lime slaking box (33) is connected with lime milk auxiliary box (30) by pipeline (35), and this lime slaking box (33) is provided with stirrer (34) and feed pipe (38), lime The bottom of the curing box (33) is equipped with a slag outlet (36).

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