CN114259927B - Mixing system and mixing process for online powder in pipeline - Google Patents
Mixing system and mixing process for online powder in pipeline Download PDFInfo
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- CN114259927B CN114259927B CN202111632199.6A CN202111632199A CN114259927B CN 114259927 B CN114259927 B CN 114259927B CN 202111632199 A CN202111632199 A CN 202111632199A CN 114259927 B CN114259927 B CN 114259927B
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Abstract
The invention provides a mixing system and a mixing process for online powder in a pipeline. The mixing system comprises a main material conveying pipeline, a main material metering unit, an auxiliary agent metering unit, a mixing unit and an auxiliary agent feeding unit; a first reversing valve and a mixing nozzle are sequentially arranged on the main material conveying pipeline according to the material flow direction; the first reversing valve comprises a first main material outlet connected to the main material metering unit and a second main material outlet connected to the mixing nozzle and is used for switching the flow direction of the main materials; n metering units are used for respectively metering the feeding amount of n auxiliaries to the mixing unit, and n is more than or equal to 1; the mixing unit is respectively connected with the main material metering unit and the auxiliary agent metering unit; the mixing head includes an inlet and an outlet, and the inlet thereof is connected to the mixing unit and the outlet thereof is connected to the main material transfer line. The invention also provides a mixing process using the mixing system. The mixing system and the mixing process can effectively mix the powder in the pipeline on line.
Description
Technical Field
The invention belongs to the field of powder engineering, and particularly relates to a mixing system and a mixing process for pipeline inline powder.
Background
In order to improve the product performance, the addition of an auxiliary agent is one of the commonly used modification modes, namely, the product and the auxiliary agent are mixed in a certain mixing mode and sent to a downstream system for further processing. Common auxiliaries are: flavoring agent, flow aid, antioxidant, toughening agent, antistatic agent, heat stabilizer and the like. Because the auxiliary agent is generally poor in fluidity and is not easy to disperse, great challenges are brought to the mixing process. In order to solve the problem of mixing powder materials, stirring and pneumatic mixing technologies are widely applied to the field of material mixing, but with the improvement of the scale and intelligence level of the chemical industry, the defects of high energy consumption, low capacity, high failure rate, incapability of continuous production and the like of common stirring and batch pneumatic mixing technologies seriously restrict the expansion of the product scale. With the development of scientific technology, some emerging technologies gradually appear recently.
Representative patents of the current powder mechanical mixing technology are as follows: CN 208583281U discloses a powder mixing arrangement for lithium battery cathode material production, is a typical vertical mechanical mixing device, relies on the use of mutually supporting of stirring vane and helical blade in the equipment, and stirring vane carries out positive and negative alternate mixing once more to the lithium battery cathode material that the bottom rolled up, makes lithium battery cathode material obtain abundant mixture. CN 207413288U discloses a horizontal powder mixer, in which when a roller rotates in the mixer, a certain amount of material is lifted to a certain height by a partition plate and then falls onto a vibrating screen, and the vibrating screen further mixes the powder. CN 209501515U A soil conditioner powder mixes and uses toper double helix mixing arrangement, utilizes the rotation of puddler and rotating vane to drive the material and overturn from top to bottom, impels the material to mix evenly.
Representative patents for gas stream mixing are as follows: CN109966973A discloses a dry powder mixing device, which uses high-speed gas to push powder to roll in a mixing cylinder to achieve the mixing purpose, and has no dead angle and no pollution. CN107754627A discloses a powder mixer of a rotary fluidized bed, which drives particle materials to roll up and down by rotating airflow, and a static mixer arranged in a bin body enables the powder particle materials to complete the mixing process in the process of rising and falling. CN103434023A, a dry powder material pipeline mixer is introduced, which achieves the purpose of uniform dispersion and mixing of materials by shunting, crossing and reverse mixing. CN107875941A, which proposes an apparatus and a method for pneumatic mixing of particulate materials, wherein the operations of pneumatic mixing in a mixer are performed by discharging materials from two discharge tanks.
Disclosure of Invention
The first purpose of the invention is to provide a mixing system for online powder in a pipeline, which can effectively mix the online powder in the pipeline;
the second purpose of the invention is to provide a mixing process for mixing the online powder in the pipeline by using the mixing system, and the mixing process can effectively mix the online powder in the pipeline.
In order to realize the first purpose of the invention, the following technical scheme is adopted:
a mixing system for online powder in a pipeline comprises a main material conveying pipeline, a main material metering unit, an auxiliary agent metering unit, a mixing unit and an auxiliary agent feeding unit;
a first reversing valve and a mixing nozzle are sequentially arranged on the main material conveying pipeline according to the material flow direction;
the first reversing valve comprises a first main material outlet and a second main material outlet, the first main material outlet is connected to the main material metering unit, the second main material outlet is connected to the mixing nozzle along the main material conveying pipeline, and the first reversing valve is used for switching the flow direction of the main material conveyed by the main material conveying pipeline by switching the first main material outlet and the second main material outlet;
the main material metering unit is used for metering the feeding amount of the main material to the mixing unit;
the auxiliary agent metering units are n and are used for respectively metering the feeding amount of n auxiliary agents to the mixing unit, and n is more than or equal to 1;
the mixing unit is respectively connected with the main material metering unit and the auxiliary agent metering unit and is used for receiving and mixing the main material from the main material metering unit and the auxiliary agent from the auxiliary agent metering unit so as to pre-mix and dilute the auxiliary agent from the auxiliary agent metering unit by using the main material from the main material metering unit to obtain a pre-mixed material;
the mixing nozzle includes an inlet and an outlet, and the inlet is connected to the mixing unit, and the outlet is connected to the main material conveying line, for spraying the premixed material from the mixing unit into the main material conveying line to be mixed with the main material therein.
Preferably, the main material metering unit comprises a main material feeding pipeline, a main material bin, a first screw conveyor, a main material discharging pipeline and a first cutoff valve;
the top of the main material bin is provided with a main material feeding hole and a main material seat bin dust remover respectively, the middle part of the main material bin is provided with a main material weighing module, and the bottom of the main material bin is provided with a main material discharging hole;
the first reversing valve is connected with the main material bin through the main material bin inlet pipeline, the first end of the main material bin inlet pipeline is connected to the first main material outlet of the first reversing valve, and the second end of the main material bin inlet pipeline is connected to the main material feeding hole in the top of the main material bin;
the main material bin is connected to a feeding hole of the first spiral conveyor through a main material discharging hole in the bottom of the main material bin;
the main material metering unit is connected with the mixing unit through a main material discharging pipeline, the first end of the main material discharging pipeline is connected to the discharge hole of the first screw conveyor, and the second end of the main material discharging pipeline is connected to the mixing unit;
the first cut-off valve is arranged on the main material outlet pipeline.
Preferably, the auxiliary agent metering unit comprises an auxiliary agent inlet pipeline, an auxiliary agent bin, a second screw conveyer, an auxiliary agent outlet pipeline and a second cut-off valve;
the top of the additive bin is provided with an additive feeding hole and an additive seat bin dust remover respectively, the middle part of the additive bin is provided with an additive weighing module, and the bottom of the additive bin is provided with an additive discharging hole;
the auxiliary agent feeding pipeline is connected to an auxiliary agent feeding hole in the top of the auxiliary agent bin;
the auxiliary agent bin is connected to a feeding hole of the second screw conveyor through an auxiliary agent discharging hole in the bottom of the auxiliary agent bin;
the auxiliary agent metering unit is connected with the mixing unit through an auxiliary agent outlet pipeline, a first end of the auxiliary agent outlet pipeline is connected to a discharge port of the second screw conveyor, and a second end of the auxiliary agent outlet pipeline is connected to the mixing unit;
the second stop valve is arranged on the auxiliary agent outlet pipeline.
Preferably, the mixing unit comprises a mixing device, a premix feed discharge line, a third shut-off valve and a rotary valve;
the top of the mixing equipment is provided with a main material feeding hole and an auxiliary agent feeding hole, the middle part of the mixing equipment is provided with a premix weighing module, the bottom of the mixing equipment is provided with a premix discharging hole, the main material feeding hole at the top of the mixing equipment is connected with the second end of the main material discharging pipeline, the auxiliary agent feeding hole at the top of the mixing equipment is connected with the second end of the auxiliary agent discharging pipeline, and the main material feeding hole and the auxiliary agent are used for feeding the main material and the auxiliary agent to be mixed and then outputting the premix from the premix discharging hole;
the mixing unit is connected with the auxiliary agent feeding unit through the premix discharging pipeline, the first end of the premix discharging pipeline is connected to a premix discharging port at the bottom of the mixing device, and the second end of the premix discharging pipeline is connected to the auxiliary agent feeding unit;
the third cut-off valve and the rotary valve are sequentially arranged on the premix discharging pipe line according to the material flow direction.
Preferably, the auxiliary agent feeding unit comprises an air source device, an air source conveying pipeline, an accelerator and a premix conveying pipeline which are sequentially communicated;
the accelerator comprises a first feeding hole, a second feeding hole and a discharging hole, the accelerator is connected to the air source conveying pipeline through the first feeding hole, connected to the second end of the premix discharging pipeline through the second feeding hole, connected to the first end of the premix conveying pipeline through the discharging hole, and connected to the inlet of the mixing nozzle through the second end of the premix conveying pipeline, and the premix conveying pipeline is used for conveying premix from the premix discharging pipeline to the mixing nozzle through the premix conveying pipeline by utilizing air source power from the air source conveying pipeline.
Preferably, the installation angle of the mixing nozzle on the main material conveying pipeline is 60-120 degrees, and the installation angle is an included angle between the central axis of the mixing nozzle and the material flow direction of the main material conveying pipeline;
preferably, the mixing nozzle is a dual-channel coaxial jet, sequentially comprises a nozzle main body and an undisturbed section from top to bottom, and is connected to the main material conveying pipeline through the undisturbed section;
an anti-disturbance ring is further arranged inside the mixing spray head and fixedly arranged at the joint of the spray head main body and the non-disturbance section;
preferably, the disturbance prevention ring comprises an inner ring, an outer ring and a fixing rod; the inner ring and the outer ring are coaxially arranged through the fixed rod; the number of the fixed rods is 2, the fixed rods are fixed on the inner ring and the outer ring in a crossed mode in a cross mode, and the crossed points of the fixed rods coincide with the centers of the inner ring and the outer ring.
Preferably, the nozzle body comprises a powder passage and an air flow passage which are sequentially arranged from the center to the periphery along the same central axis; the powder channel comprises a first straight cylinder section and a first contraction section which are sequentially arranged from top to bottom, and the airflow channel comprises a second straight cylinder section and a second contraction section which are sequentially arranged from top to bottom; the upper edge of the first straight cylinder section is higher than the upper edge of the second straight cylinder section, and the lower edges of the first contraction section and the second contraction section are positioned at the same height;
a turbulent fluid is also arranged in the spray head main body, is arranged in the powder channel and is positioned at the joint of the first straight cylinder section and the first contraction section;
preferably, the turbulent fluid is fixed to the inner wall of the first contraction section by a bracket;
preferably, the turbulent fluid comprises an upper cone and a lower cone which are symmetrically and fixedly connected through the bottom surface respectively;
preferably, the bottom surfaces of the upper cone and the lower edge of the first straight cylinder section are positioned on the same plane;
preferably, the taper angles of the upper cone and the lower cone are both 30-90 °.
In order to achieve the second object of the present invention, 8 a mixing process for mixing the powder in the pipeline on line by using the mixing system is also provided.
Preferably, the mixing process comprises the steps of:
(1) Switching the first reversing valve to a first main material outlet of the first reversing valve, and starting material conveying in the main material conveying pipeline to convey the main materials to the main material metering unit through the main material conveying pipeline, the first reversing valve and the first main material outlet of the first reversing valve;
(2) Respectively conveying n auxiliary agents into n auxiliary agent metering units, wherein n is more than or equal to 1;
(3) Simultaneously feeding the main material from the main material metering unit and the auxiliary agent from the auxiliary agent metering unit into the mixing unit according to the proportion respectively for mixing, and premixing the auxiliary agent by using the main material to obtain a premix;
(4) Switching the first reversing valve to a second main material outlet of the first reversing valve, and spraying the premix from the mixing unit into the main material conveying pipeline through the mixing nozzle to be mixed with the main material in the main material conveying pipeline;
(5) Repeating the steps (1) - (4) to continuously operate the system.
Preferably, the mixing process comprises the steps of:
(1) Switching the first reversing valve to a first main material outlet of the first reversing valve, starting material conveying in the main material conveying pipeline, conveying the main material into a main material bin of the main material metering unit through the main material conveying pipeline, the first reversing valve, the first main material outlet of the first reversing valve and a main material bin inlet pipeline, and stopping material conveying in the main material conveying pipeline when the main material entering the main material bin reaches the high material level of the main material weighing module;
(2) Conveying n additives to additive bins of n additive metering units through respective additive feeding pipelines respectively, and stopping material conveying of the additive feeding pipelines when the additives entering the additives reach the high material level of the additive weighing module, wherein n is more than or equal to 1;
(3) Opening a first cut-off valve and a second cut-off valve, feeding the main material from the main material metering unit into a first spiral conveyor from a main material discharge port at the bottom of a main material bin according to the proportion of the main material to the auxiliary agent, outputting the main material into mixing equipment of a mixing unit through a main material outlet pipeline, simultaneously feeding the auxiliary agent from the auxiliary agent metering unit into a second spiral conveyor from an auxiliary agent discharge port at the bottom of an auxiliary agent bin, outputting the auxiliary agent into the mixing equipment of the mixing unit through an auxiliary agent outlet pipeline, stopping the first spiral conveyor and the second spiral conveyor after the main material and the auxiliary agent entering the mixing unit respectively reach required amounts, closing the first cut-off valve and the second cut-off valve, and mixing for 5-45min in the mixing equipment to obtain a premix;
(4) Switching the first reversing valve to a second main material outlet of the first reversing valve, starting the air source device, opening the third cut-off valve and the rotary valve, and adjusting the flow rate of the rotary valve to enable the air source to be conveyed into the accelerator through the air source conveying pipeline so as to drive the premix output to the accelerator from the premix discharge pipeline to be conveyed to the mixing nozzle through the premix conveying pipeline, and the premix is sprayed into the main material conveying pipeline through the mixing nozzle to be mixed with the main material in the main material conveying pipeline;
(5) And (3) when the premix in the mixing device in the mixing unit reaches the low material level of the premix weighing module, closing the rotary valve, and repeating the steps (1) to (4) so as to continuously perform the system.
The invention has the beneficial effects that:
the mixing system and the mixing method can realize continuous mixing of the online powder in the pipeline, and the system has high automation degree; through the arrangement of the mixing spray head, the powder bodies are diffused, convected and sheared, so that high-efficiency mixing is realized; meanwhile, the mixing system has small occupied area and is easy to maintain; the mixing method is simple and easy to operate.
Drawings
FIG. 1 is a schematic diagram of the hybrid system of the present invention in one embodiment;
FIG. 2 is a schematic diagram of a mixing head of the mixing system of the present invention in one embodiment;
FIG. 3 is a schematic view of an embodiment of an anti-disturbance ring in the mixing tip of FIG. 2;
FIG. 4 is a view showing a state of use of the mixing tip shown in FIG. 2;
fig. 5 is a schematic view showing the structure of the mixing system in comparative example 1.
Detailed Description
The technical solution and effects of the present invention will be further described with reference to the accompanying drawings and the detailed description. The following embodiments are merely illustrative of the present invention, and the present invention is not limited to the following embodiments or examples. Simple modifications of the invention applying the inventive concept are within the scope of the invention as claimed.
As shown in fig. 1-4, a mixing system for on-line powder in a pipeline includes a main material conveying pipeline 1, a main material metering unit, an auxiliary agent metering unit, a mixing unit and an auxiliary agent feeding unit;
the main material conveying pipeline 1 is sequentially provided with a first reversing valve 2 and a mixing nozzle 3 according to the material flow direction;
the first reversing valve 2 comprises a first main material outlet and a second main material outlet, the first main material outlet is connected to the main material metering unit, the second main material outlet is connected to the mixing nozzle 3 along the main material conveying pipeline 1, and the first reversing valve is used for switching the flow direction of the main material conveyed by the main material conveying pipeline 1 by switching the first main material outlet and the second main material outlet;
the main material metering unit is used for metering the feeding amount of the main material to the mixing unit;
the auxiliary agent metering units are n and are used for respectively metering the feeding amount of n auxiliary agents to the mixing unit, and n is more than or equal to 1;
the mixing unit is respectively connected with the main material metering unit and the auxiliary agent metering unit and is used for receiving and mixing the main material from the main material metering unit and the auxiliary agent from the auxiliary agent metering unit so as to pre-mix and dilute the auxiliary agent from the auxiliary agent metering unit by using the main material from the main material metering unit to obtain a premix;
the mixing head 3 includes an inlet and an outlet, and the inlet is connected to the mixing unit, and the outlet is connected to the main material transfer line 1, for spraying the premixed material from the mixing unit into the main material transfer line 1 to be mixed with the main material therein.
According to the mixing system, the feeding amount of the main materials to the mixing unit is measured through the main material measuring unit; the feeding amount of the auxiliary agent to the mixing unit is measured through the auxiliary agent measuring unit, and the fed auxiliary agent is premixed and diluted by the fed main material through the mixing unit, so that the proportion of the main material to the auxiliary agent in the premixing stage is regulated and controlled; the premix obtained from the mixing unit is conveyed to the mixing nozzle through the auxiliary agent feeding unit, and is sprayed into the main material conveying pipeline 1 through the mixing nozzle to be mixed with the main materials in the main material conveying pipeline 1, so that the system is simple and easy to operate, and the effective mixing of the inline powder in the pipeline is realized. And the mixed material obtained after mixing is continuously conveyed to a product bin along the main material conveying pipeline 1 for storage.
Those skilled in the art understand that the main material conveying pipeline 1 is connected to a pneumatic conveying system to convey materials by using the power of the pneumatic conveying system. The pneumatic conveying system can be used for dilute phase conveying or dense phase conveying from the solid-gas ratio angle; defined from the delivery pressure, either positive or negative pressure delivery is possible.
Those skilled in the art will appreciate that the mixing system of the present invention will deliver the mix after mixing the adjuvant and the base ingredients to at least 1 product bin for storage. Namely, the tail end of the main material conveying pipeline 1 is sequentially provided with at least 1 product bin along the flow direction of the main material conveying pipeline 1. The premixed material is sprayed into the main material conveying pipeline 1 through the mixing nozzle 3 and then is mixed with the main material in the main material conveying pipeline 1, and the mixing can be uniformly mixed within a certain time and a certain distance, so that the premixed material needs to be uniformly mixed within a certain distance along the main material conveying pipeline 1 before entering a product bin.
In one embodiment, the mixing distance of the premixed material sprayed into the main material conveying line 1 by the mixing nozzle 3 is 15 to 100m, such as 20m, 30m, 40m, 50m, 60m, 70m, 80m and 90m, in the main material conveying line 1.
In one embodiment, a second diverter valve is further disposed on the main material conveying pipeline 1, and the second diverter valve is disposed between the mixing nozzle 3 and the product bin and is used for feeding the mixture obtained in the main material conveying pipeline 1 to the product bin. Namely, the distance from the mixing nozzle 3 to the second direction-changing valve (29) on the main material conveying pipeline 1 is 15-100m, such as 20m, 30m, 40m, 50m, 60m, 70m, 80m and 90m.
In one embodiment, the main material may be selected from various powder products, such as pharmaceutical powder, food powder, milk powder, polymer powder, and fine chemical powder.
In one embodiment, the particle size of the primary material is 0-2000 μm, such as 10 μm, 100 μm, 200 μm, 500 μm, 1000 μm, 1500 μm and 2000 μm; bulk densities of 0.2-3g/ml, such as 0.3g/ml, 0.5g/ml, 1g/ml, 1.5g/ml, 2g/ml and 2.5g/ml; the moisture content is 0 to 30wt%, such as 1wt%, 2wt%, 5wt%, 10wt%, 15wt%, 20wt% and 25wt%.
In one embodiment, the adjuvant may be selected from functionalized powders, such as flow aid powders, dispersant powders, toughening agent powders, and flavor powders.
The number of the auxiliary agents can be 1, or a plurality of auxiliary agents can be provided according to the needs, and if the number of the auxiliary agents is multiple, the same number of auxiliary agent metering units are also needed so as to respectively meter different types of auxiliary agents entering the mixing unit.
In one embodiment, the particle size of the adjuvant is 0-1000 μm, such as 10 μm, 100 μm, 200 μm, 300 μm, 500 μm, 700 μm and 900 μm; bulk densities of 0.1-3g/ml, such as 0.3g/ml, 0.5g/ml, 1g/ml, 1.5g/ml, 2g/ml and 2.5g/ml; the moisture content is 0 to 30wt%, such as 1wt%, 2wt%, 5wt%, 10wt%, 15wt%, 20wt% and 25wt%.
In one embodiment, the main material transfer line 1 has a diameter of 50 to 350mm, such as 100mm, 150mm, 200mm, 250mm and 300mm;
in one embodiment, the transport gas velocity in the main feed transport line 1 is 3 to 40m/s, such as 5m/s, 10m/s, 15m/s, 20m/s, 25m/s, 30m/s and 35m/s; the preferred material flow is 1-50t/h, such as 5t/h, 10t/h, 15t/h, 20t/h, 25t/h, 30t/h, 35t/h, 40t/h and 45t/h.
In one embodiment, the main material metering unit comprises a main material inlet pipeline 4, a main material bin 5, a first screw conveyor 6, a main material outlet pipeline 7 and a first cut-off valve 8;
the top of the main material bin 5 is respectively provided with a main material feeding hole and a main material seat bin dust remover 51 which are respectively used for feeding the main material and separating gas and solid; the middle part is provided with a main material weighing module 52 used for metering the amount of the main materials entering the mixing unit; the bottom of the container is provided with a main material discharge hole for discharging the main material;
the first reversing valve 2 is connected with the main material bin 5 through the main material feeding pipeline 4, a first end of the main material feeding pipeline 4 is connected to a first main material outlet of the first reversing valve 2, and a second end of the main material feeding pipeline 4 is connected to a main material feeding hole in the top of the main material bin 5, so that the main material in the main material conveying pipeline 1 is fed into the main material bin 5;
the main material bin 5 is connected to a feed inlet of the first screw conveyor 6 through a main material discharge hole in the bottom of the main material bin, and is used for feeding the main material in the main material bin 5 to the first screw conveyor 6;
the main material metering unit is connected with the mixing unit through a main material discharging pipeline 7, a first end of the main material discharging pipeline 7 is connected to a discharging port of the first screw conveyor 6, and a second end of the main material discharging pipeline 7 is connected to the mixing unit and is used for feeding the main material in the main material metering unit to the mixing unit;
the first cut-off valve 8 is arranged on the main material outlet pipeline 7 and is used for controlling the discharge of the main material in the main material bin 5, so that the main material feeding amount of the mixing unit is accurately controlled.
In the invention, the main material metering unit is isolated from other units mainly by using the main material weighing module 52 and the first cut-off valve 8, and the main materials are ensured to be fed into the mixing unit more accurately through the rotation speed of the first screw conveyor 6 and the weight loss interlocking control in the main material weighing module 52.
In one embodiment, in the main material metering unit, a main material feeding flexible connection 41 is arranged on the main material warehousing pipeline 4 so as to avoid the problem of unstable warehousing caused by vibration during the warehousing process.
In one embodiment, the main material discharging pipeline 7 is provided with a main material feeding flexible connection and a main material discharging flexible connection 71, so that the problem that the metering is unstable and inaccurate due to vibration in the process of discharging the main material to the mixing unit is avoided.
In the invention, the main material metering unit further utilizes the main material feeding flexible connection 41 and the main material feeding flexible connection 71 to ensure the stress isolation between the main material metering unit and other units, and the main material is ensured to be accurately fed into the mixing unit through the rotation speed of the first screw conveyor 6 and the weight loss interlocking control in the main material weighing module 52.
In one embodiment, the first shut-off valve 8 is disposed between the discharge outlet of the first screw conveyor 6 and the main material feeding flexible connection main material discharging flexible connection 71.
In one embodiment, the main material silo 5 is directly connected to the feed inlet of the first screw conveyor 6 via the main material outlet at the bottom thereof, i.e. without a chute or the like in the middle.
In one embodiment, the effective volume of the main material bin 5 is 0.5-10m 3 E.g. 1m 3 、2m 3 、3m 3 、4m 3 、5m 3 、6m 3 、7m 3 、8m 3 And 8m 3 。
In one embodiment, the main material bin 5 includes a main material straight cylinder section and a main material truncated cone-shaped contraction section, and the main material weighing module 52 is disposed on the main material straight cylinder section.
In one embodiment, the first screw conveyor 6 has a conveying capacity of 1-20t/h, such as 3t/h, 5t/h, 7t/h, 10t/h and 13t/h.
In one embodiment, the additive metering unit comprises an additive inlet line 9, an additive bin 10, a second screw conveyor 11, an additive outlet line 12 and a second shut-off valve 13;
the top of the additive bin 10 is respectively provided with an additive feeding hole and an additive seat bin dust remover 101 which are respectively used for feeding materials and separating gas and solid; the middle part is provided with an auxiliary agent weighing module 102 for metering the amount of the auxiliary agent entering the mixing unit; the bottom of the main material tank is provided with an auxiliary agent discharge port for discharging the main material;
the additive feeding pipeline 9 is connected to an additive feeding hole at the top of the additive bin 10;
the auxiliary agent bin 10 is connected to a feeding hole of the second spiral conveyor 11 through an auxiliary agent discharging hole at the bottom of the auxiliary agent bin, and is used for feeding the auxiliary agent in the auxiliary agent bin 10 to the second spiral conveyor 11;
the auxiliary agent metering unit is connected with the mixing unit through an auxiliary agent outlet pipeline 12, a first end of the auxiliary agent outlet pipeline 12 is connected to a discharge hole of the second screw conveyor 11, and a second end of the auxiliary agent outlet pipeline is connected to the mixing unit and is used for feeding the auxiliary agent in the auxiliary agent metering unit to the mixing unit;
the second block valve 13 is disposed on the additive discharge pipeline 12 and is used for controlling the discharge of the additives in the additive storage bin 10, so as to accurately control the additive feeding amount of the mixing unit.
In the invention, the auxiliary agent metering unit is isolated from other units mainly by using the auxiliary agent weighing module 102 and the second cut-off valve 13, and the main materials are ensured to be fed into the mixing unit more accurately through the rotation speed of the second screw conveyor 18 and the weight loss interlocking control in the auxiliary agent weighing module 102.
As understood by those skilled in the art, the additive can enter the additive storage bin 10 by manual feeding, mechanical feeding or pneumatic conveying; preferably, the effective volume of the auxiliary agent bin 10 is 0.5-4m 3 E.g. 1m 3 、2m 3 And 3m 3 Generally, the amount of the auxiliary agent in the composition is required to be available for 3 to 10 days.
In one embodiment, the auxiliary agent inlet pipeline 9 is provided with an auxiliary agent feeding flexible connection 91 to avoid the problem of unstable inlet caused by vibration during the inlet process.
In one embodiment, the additive outlet pipeline 12 is provided with an additive outlet flexible connection 121 to avoid the problem of unstable and inaccurate metering caused by vibration during the process of discharging and feeding the additive to the mixing unit.
In the invention, the auxiliary agent metering unit further utilizes the auxiliary agent feeding flexible joint 91 and the auxiliary agent discharging flexible joint 121 to ensure the stress isolation between the auxiliary agent metering unit and other units, and the main materials are accurately fed into the mixing unit through the rotation speed of the second screw conveyor 18 and the weight loss interlocking control in the auxiliary agent weighing module 102.
Preferably, the second block valve 13 is disposed between the discharge port of the second screw conveyor 11 and the additive discharge flexible joint 121.
In one embodiment, the additive bunker 10 is directly connected to the feed inlet of the second screw conveyor 11 via the additive outlet at the bottom thereof, i.e. there is no chute or the like in the middle.
In one embodiment, the second screw conveyor 11 has a conveying capacity of 5-1000kg/h, such as 10kg/h, 30kg/h, 50kg/h, 100kg/h, 300kg/h, 500kg/h and 800kg/h.
In one embodiment, the mixing unit comprises a mixing device 14, a premix feed outlet line 15, a third shut-off valve 16 and a rotary valve 17;
a main material feeding port and an auxiliary material feeding port are formed in the top of the mixing device 14 and are used for feeding the main material and the auxiliary material respectively; the middle part is provided with a premix weighing module 141 for metering the total amount of the main materials and the auxiliary agents entering the mixing unit; the bottom of the main material outlet pipeline is provided with a premix discharge port, the main material inlet at the top of the main material outlet pipeline is connected with the second end of the main material outlet pipeline 7, the auxiliary material inlet at the top of the main material outlet pipeline is connected with the second end of the auxiliary agent outlet pipeline 12, and the premix discharge port is used for outputting premix after the main material and the auxiliary agent are mixed;
the mixing unit and the additive feeding unit are connected through the premix discharging pipeline 15, a first end of the premix discharging pipeline 15 is connected to a premix discharging port at the bottom of the mixing device 14, and a second end of the premix discharging pipeline is connected to the additive feeding unit, and is used for feeding premix from the mixing unit to the additive feeding unit;
the third cut-off valve 16 and the rotary valve 17 are sequentially arranged on the premix discharging pipeline 15 according to the material flow direction.
In the invention, the mixing unit is isolated from other units mainly by using the premix weighing module 141 and the third cut-off valve 16, and the premix is ensured to be fed to the auxiliary agent conveying unit more accurately through the interlocking control of the rotating speed of the rotary valve 17 and the weight loss of the premix weighing module 141.
According to the invention, the auxiliary agent is premixed and diluted by the main material through the mixing unit, so that the fluidity of the auxiliary agent can be effectively improved, and the mixing uniformity of the main material and the auxiliary agent is improved.
The mixing device 14 is a conventional mixing device as understood by those skilled in the art. In one embodiment, the mixing device 14 is a mechanical mixing device, and the device can be in the form of a vertical mixer, a horizontal mixer, a V-shaped mixer, and the like, but is not limited to such devices. Preferably, the mixing device 14 has an effective volume of 1-12m 3 E.g. 2m 3 、4m 3 、6m 3 、8m 3 And 10m 3 (ii) a The batch mixing time is 5-45min, such as 10min, 15min, 20min, 25min, 30min, 35min and 40min.
In one embodiment, the premix feed line 21 has a diameter of 25 to 100mm, such as 35mm, 50mm, 65mm and 80mm.
In one embodiment, the feed gas velocity in premix feed line 21 is in the range of 5 to 35m/s, such as 10m/s, 15m/s, 20m/s, 25m/s and 30m/s; the material flow is preferably 5 to 2000kg/h, such as 10kg/h, 30kg/h, 50kg/h, 100kg/h, 300kg/h, 500kg/h, 1000kg/h, 1200kg/h, 1500kg/h and 1800kg/h.
In one embodiment, the auxiliary agent feeding unit comprises an air source device 18, an air source conveying pipeline 19, an accelerator 20 and a premix conveying pipeline 21 which are sequentially communicated;
the accelerator 20 comprises a first feeding hole, a second feeding hole and a discharging hole, and is connected to the air source conveying pipeline 19 through the first feeding hole, connected to the second end of the premix discharging pipeline 15 through the second feeding hole, and connected to the first end of the premix conveying pipeline 21 through the discharging hole, wherein the second end of the premix conveying pipeline 21 is connected to the inlet of the mixing nozzle 3, and is used for conveying the premix from the premix discharging pipeline 15 to the mixing nozzle 3 through the premix conveying pipeline 21 by using the air source power from the air source conveying pipeline 19.
In one embodiment, the gas supply line 19 is provided with a gas supply flexible connection 191, and the premix feed line 21 is provided with a premix flexible connection 211.
In the invention, the mixing unit further utilizes the main material feeding flexible connection main material discharging flexible connection 71, the auxiliary agent discharging flexible connection 121, the air source flexible connection 191 and the premix flexible connection 211 to ensure that the mixing unit is isolated from other units, and the premix is ensured to be accurately fed to the auxiliary agent conveying unit through the interlocking control of the rotating speed of the rotary valve 17 and the weight loss of the premix weighing module 141.
In one embodiment, the installation angle of the mixing nozzle 3 on the main material conveying pipeline 1 is 60 to 120 °, such as 70 °, 80 °, 90 °, 100 ° and 110 °, and the installation angle is an included angle between a central axis of the mixing nozzle 3 and the material flow direction of the main material conveying pipeline 1.
In one embodiment, the mixing head 3 is a two-channel coaxial jet, which comprises a head main body 31 and an undisturbed section 32 from top to bottom, and is connected to the main material conveying pipeline 1 through the undisturbed section 32;
the interior of the mixing nozzle 3 is further provided with an anti-disturbance ring 33, and the anti-disturbance ring 33 is fixedly arranged at the joint of the nozzle main body 31 and the non-disturbance section 32.
In one embodiment, the undisturbed section 32 has a length of 30-150mm; the length of the nozzle body 31 is 70 to 290mm, such as 80mm, 100mm, 150mm, 200mm, 250mm, etc.
Preferably, the disturbance prevention ring 33 includes an inner ring 331, an outer ring 332, and a fixing rod 333; the inner ring 331 and the outer ring 332 are coaxially arranged through the fixing rod 333; the number of the fixing rods 333 is 2, and the fixing rods are fixed on the inner ring 331 and the outer ring 332 in a cross shape, and the cross points coincide with the centers of the inner ring 331 and the outer ring 332.
In one embodiment, the diameter of the outer ring 332 is 1-5mm larger than the diameter of the inner ring 331, such as 2mm, 3mm and 4mm larger;
preferably, the inner ring 331 has a diameter of 25-75mm, such as 30mm, 35mm, 40mm, 45mm, 50mm, 55mm, 60mm, 65mm and 70mm;
preferably, the outer ring 332 has a diameter of 30-80mm, such as 35mm, 37mm, 40mm, 41mm, 45mm, 50mm, 55mm, 60mm, 65mm, 70mm and 75mm;
preferably, the height of the disturbance prevention ring 33 is 10-30mm, such as 15mm, 20mm and 25mm.
In one embodiment, the showerhead body 31 includes a powder passage 311 and a gas passage 312 concentrically arranged from the center to the periphery; the powder channel 311 comprises a first straight cylinder section and a first contraction section which are sequentially arranged from top to bottom, and the airflow channel 312 comprises a second straight cylinder section and a second contraction section which are sequentially arranged from top to bottom; the upper edge of the first straight cylinder section is higher than the upper edge of the second straight cylinder section, and the lower edges of the first contraction section and the second contraction section are positioned at the same height;
the sprayer body 31 is further provided with a fluid disturbing body 313, and the fluid disturbing body 313 is arranged in the powder passage 311 and is positioned at the joint of the first straight cylinder section and the first contraction section.
In one embodiment, the turbulent fluid 313 is fixed to the inner wall of the first contraction section by a bracket.
In one embodiment, the mixing head 3 has an air flow velocity in the air flow channel 312 of 25-100m/s, such as 30m/s, 40m/s, 50m/s, 60m/s, 70m/s, 80m/s, and 90m/s.
In one embodiment, the first cylindrical section has a length of 70-290mm, such as 90mm, 120mm, 150mm, 200mm and 250mm; preferably the length of the second straight section is 40-240mm, such as 60mm, 80mm, 100mm, 130mm, 160mm, 190mm and 230mm; preferably, the length of the air flow channel 312 is 65-280mm, such as 90mm, 120mm, 150mm, 180mm, 210mm, 240mm and 270mm.
In one embodiment, the turbulent flow 313 comprises an upper cone and a lower cone, which are symmetrically and fixedly connected by a bottom surface;
preferably, the bottom surfaces of the upper cone and the lower cone are positioned on the same plane with the lower edge of the first straight cylinder section; preferably, the gap between the bottom edges of the upper cone and the lower edge of the first cylindrical section is 10-40mm, such as 15mm, 20mm, 25mm, 30mm and 35mm;
preferably, the generatrix length of each of the upper cone and the lower cone is 20-60mm, such as 30mm, 40mm and 50mm;
preferably, the distance between the apex of the lower cone and the lower edge of the first narrowing is 10-50mm, such as 20mm, 30mm and 40mm;
preferably, the cone angle of the upper cone and the lower cone is 30-90 °, such as 40 °, 50 °, 60 °, 70 ° and 80 °.
The invention also provides a mixing process for mixing the online powder in the pipeline by using the mixing system.
Preferably, the mixing process comprises the steps of:
(1) Switching the first reversing valve 2 to a first main material outlet of the first reversing valve, starting material conveying in the main material conveying pipeline 1, and conveying the main materials to the main material metering unit through the main material conveying pipeline 1, the first reversing valve 2 and the first main material outlet of the first reversing valve;
(2) Respectively conveying n auxiliary agents into n auxiliary agent metering units, wherein n is more than or equal to 1;
(3) Simultaneously feeding the main material from the main material metering unit and the auxiliary agent from the auxiliary agent metering unit into the mixing unit according to the proportion respectively for mixing so as to premix the auxiliary agent by using the main material to obtain a premix;
(4) Switching the first reversing valve 2 to a second main material outlet thereof, and spraying the premix from the mixing unit into the main material conveying pipeline 1 through the mixing nozzle 3 to be mixed with the main material therein;
(5) Repeating the steps (1) to (4) to continuously perform the system.
In one embodiment, in the step (1), the main material is conveyed into the main material bin 5 from the first main material outlet of the first reversing valve (2) through the main material inlet pipeline 4, and the material conveying in the main material conveying pipeline 1 is stopped until the main material entering the main material bin reaches the high material level of the main material weighing module 52.
In one embodiment, in the step (2), the auxiliary agent is conveyed into the auxiliary agent bin 10 through the auxiliary agent inlet pipeline 9, and the material conveying of the auxiliary agent inlet pipeline 9 is stopped until the auxiliary agent entering the auxiliary agent bin reaches the high material level of the auxiliary agent weighing module 102.
In one embodiment, in the step (3), the first cut-off valve 8 and the second cut-off valve 13 are opened to facilitate the feeding of the main material and the auxiliary.
Preferably, in the step (3), the main material from the main material metering unit is fed into the first screw conveyor 6 from a main material outlet at the bottom of the main material bin 5, and is output to the mixing unit through a main material outlet pipeline 7.
Preferably, in the step (3), the auxiliary agent from the auxiliary agent metering unit is fed into the second screw conveyor 11 from an auxiliary agent outlet at the bottom of the auxiliary agent silo 10 and is output to the mixing unit through an auxiliary agent outlet pipeline 12.
Preferably, in the step (3), the main material from the main material metering unit and the auxiliary agent from the auxiliary agent metering unit are simultaneously fed into the mixing device 14 of the mixing unit according to the proportion, and after the main material and the auxiliary agent entering the mixing device reach the required amounts respectively, the first screw conveyor 6 and the second screw conveyor 11 are stopped, and the first block valve 8 and the second block valve 13 are closed.
Preferably, in the step (3), the feeding flow rates of the main material and the auxiliary agent are determined according to the ratio of the main material to the auxiliary agent, and the rotation speeds and the interlocking control of the first screw conveyor 6 and the second screw conveyor 11 are further set.
Preferably, in the step (3), the mixing time is 5-45min, such as 10min, 15min, 20min, 25min, 30min, 35min and 40min.
In one embodiment, in the step (4), the third shut-off valve 16 and the rotary valve 17 are opened, and the flow rate of the rotary valve 17 is adjusted so as to control the mixing amount of the premixed material to be delivered to the mixing device 14.
In one embodiment, in the step (4), the air supply device 18 is further opened, so that the air supply is delivered into the accelerator 20 through the air supply delivery line 19, so as to drive the premix output from the premix discharge line 15 to the accelerator 20 to be delivered to the mixing nozzle 3 through the premix delivery line 21.
The total time of steps (1) - (4) is 0.5-1.5h, such as 1h.
In one embodiment, the step (5) is performed when the premix in the mixing device 14 reaches a low level in the mixing unit.
In a preferred embodiment, as shown in fig. 1, the mixing process comprises the steps of:
(1) Switching the first reversing valve 2 to a first main material outlet of the first reversing valve, starting material conveying in the main material conveying pipeline 1, conveying the main materials to a main material bin 5 of the main material metering unit through the main material conveying pipeline 1, the first reversing valve 2, the first main material outlet of the first reversing valve and a main material bin inlet pipeline 4, and stopping material conveying in the main material conveying pipeline 1 when the main materials entering the main material bin reach the high material level of the main material weighing module 52;
(2) Conveying n auxiliary agents to auxiliary agent bins 10 of n auxiliary agent metering units through respective auxiliary agent bin inlet pipelines 9 respectively, and stopping material conveying of the auxiliary agent bin inlet pipelines 9 when the auxiliary agents entering the auxiliary agent bins reach the high material level of the auxiliary agent weighing module 102, wherein n is more than or equal to 1;
(3) Opening a first cut-off valve 8 and a second cut-off valve 13, feeding the main material from the main material metering unit into a first spiral conveyor 6 from a main material discharge port at the bottom of a main material bin 5 according to the proportion of the main material and the auxiliary agent, outputting the main material to a mixing device 14 of a mixing unit through a main material outlet pipeline 7, simultaneously feeding the auxiliary agent from the auxiliary agent metering unit into a second spiral conveyor 11 from an auxiliary agent discharge port at the bottom of an auxiliary agent bin 10, outputting the auxiliary agent to the mixing device 14 of the mixing unit through an auxiliary agent outlet pipeline 12, stopping the first spiral conveyor 6 and the second spiral conveyor 11 when the main material and the auxiliary agent entering the mixing device respectively reach required amounts, closing the first cut-off valve 8 and the second cut-off valve 13, and mixing for 5-45min in the mixing device 14 to obtain a premixed material;
(4) Switching the first reversing valve 2 to a second main material outlet of the first reversing valve, starting the air source device 18, opening the third cut-off valve 16 and the rotary valve 17, adjusting the flow of the rotary valve 17, and conveying the air source into the accelerator 20 through the air source conveying pipeline 19 so as to drive the premix output from the premix discharge pipeline 15 to the accelerator 20 to be conveyed to the mixing nozzle 3 through the premix conveying pipeline 21, and to be sprayed into the main material conveying pipeline 1 through the mixing nozzle 3 to be mixed with the main materials in the main material conveying pipeline 1;
(5) When the premixed charge in the mixing device 14 in the mixing unit reaches the low level of the premixed charge weighing module 141, the third shut-off valve 16 and the rotary valve 17 are closed and the steps (1) to (4) are repeated so that the system is continuously performed.
Example 1 (S1)
As shown in fig. 1-4, in the mixing system, n =1, that is, there are 1 auxiliary agents, corresponding to 1 auxiliary agent metering unit;
wherein the diameter of the main material conveying pipeline 1 is 150mm, and the material flow in the main material conveying pipeline is 10t/h; the main material is PC powder, the average grain diameter is 450 μm, the bulk density is 0.68g/ml, and the moisture content is 390ppm;
the average particle size of the auxiliary agent is 17 mu m, the bulk density is 0.37g/ml, and the moisture content is 1210ppm; the content of the target auxiliary agent in the final product is 500ppm;
the effective volume of the main material bin 5 is 6m 3 The batch charging mass is 4t, and the conveying capacity of the first screw conveyor 6 is 15t/h;
effective volume 2m of additive storage bin 10 3 The batch charging mass is 740kg, the batch charging mass can be used for about 5 days, and the conveying capacity of the second spiral conveyor 11 is 50kg/h;
the mixing time of the main material and the auxiliary agent in the mixing equipment 14 is 20min;
the inner diameter of a powder channel 311 in the mixing nozzle 3 is 65mm, the annular gap between the first straight cylinder section and the second straight cylinder section is 15mm, the length of the nozzle body 31 is 180mm, the height of the disturbance prevention ring 33 is 20mm, the length of the first straight cylinder section is 150mm, the length of the airflow channel 312 is 160mm, and the length of the second straight cylinder section is 140mm;
the cone angle of the upper cone and the lower cone in the turbulent fluid 313 is 60 degrees, and the length of a generatrix is 35mm; the powder channel 311 is fixedly arranged in a powder body channel by utilizing a supporting triangle, and the gap between the bottom edges of the upper cone and the lower edge of the first straight cylinder section is 15mm; the distance between the vertex of the lower cone and the lower edge of the first contraction section is 15mm; the diameter of the outer ring 332 is 40mm, the diameter of the inner ring 331 is 35mm, and the height of the disturbance prevention ring 33 is 15mm;
the main material and the auxiliary agent are mixed by using the mixing system and the mixing process, and the process parameters of the mixing system further comprise the following steps:
the air flow velocity in the air flow passage 312 in the mixing shower 3 is 35m/s; the mixing distance of the premix sprayed into the main material conveying pipeline 1 by the mixing nozzle 3 in the main material conveying pipeline 1 is 30m, and the installation angle of the mixing nozzle 3 on the main material conveying pipeline 1 is 90 degrees;
the product obtained is A1.
Example 2 (S2)
Only the following differences from example 1:
the air flow velocity in the air flow passage 312 in the mixing shower 3 is 65m/s;
the product obtained is A2.
Example 3 (S3)
Only the following differences from example 1:
the air flow velocity in the air flow passage 312 in the mixing shower 3 is 65m/s; the mixing distance of the premix sprayed into the main material conveying pipeline 1 by the mixing nozzle 3 in the main material conveying pipeline 1 is 50m;
the product obtained is A3.
Example 4 (S4)
Only the following differences from example 1:
the air flow velocity in the air flow passage 312 in the mixing shower 3 is 65m/s; the mixing distance of the premix sprayed into the main material conveying pipeline 1 by the mixing nozzle 3 in the main material conveying pipeline 1 is 50m, and the installation angle of the mixing nozzle 3 on the main material conveying pipeline 1 is 75 degrees;
the product obtained is A4.
Example 5 (S5)
Only the following differences from example 1:
the installation angle of the mixing nozzle 3 on the main material conveying pipeline 1 is 105 degrees;
the product obtained is A5.
COMPARATIVE EXAMPLE 1 (D1)
As shown in fig. 5, the hybrid system differs from embodiment 1 in that: there are no main material metering unit, mixing unit and mixing nozzle;
the mixing process differs from example 1 in that: the auxiliary agent is directly fed into the auxiliary agent feeding unit after being metered, and is directly conveyed into the main material conveying pipeline 1 by using the auxiliary agent feeding unit without a mixing nozzle; the conveying capacity of the second screw conveyor 11 was 6kg/h;
the product obtained is B1.
The content of the auxiliary agents in the products A1 to A5 obtained in examples 1 to 5 and the product B5 obtained in comparative example 1 was measured, and the results are shown in Table 1.
The detection method comprises the following steps: and respectively extracting 5 samples of 100 g from the product bin of each product at random, and respectively testing the content of the auxiliary agent in each sample by using a chemical analysis method.
The coefficient of variation is a statistic for measuring the degree of variation of each observed value in the data. When comparing two or more data variations, the standard deviation can be used directly if the units of measure are the same as the mean. If the unit and/or average are different, the degree of variation cannot be compared by using the standard deviation, but by using the ratio (relative value) of the standard deviation to the average. The ratio of the standard deviation to the mean is called the coefficient of variation and is denoted as CV. The coefficient of variation may eliminate the effect of differences in units and/or means on the comparison of the degree of variation of two or more data sets.
The coefficient of variation is calculated as coefficient of variation CV = (standard deviation SD/Mean) x 100%
When the data statistical analysis is carried out, if the coefficient of variation is more than 15%, the data is possibly abnormal and unreliable and has no reference meaning.
TABLE 1 content of auxiliary Agents in products A1 to A5 obtained in examples 1 to 5 and product B1 obtained in comparative example 1
As can be seen from table 1 and comparison between examples 1 to 5 and comparative example 1, in each example of the present invention, the coefficient of variation of the data is less than 5%, which indicates that, compared to the hybrid system of comparative example 1, the hybrid system and the hybrid process of the present invention have good mixing effect on the auxiliary agent and the main material, and the mixing result is stable, and the mixing effect and the mixing stability can be further optimized by adjusting the gas velocity, the mixing angle, the mixing distance, and the like.
In addition, the invention can avoid the defects of low efficiency, large equipment quantity, large occupied area and the like of the traditional mechanical mixing process, and the mixing system has the advantages of small occupied area, high automation degree, good mixing effect and capability of effectively guaranteeing the quality of the final product.
Claims (14)
1. A mixing system for online powder in a pipeline is characterized in that,
the mixing system comprises a main material conveying pipeline (1), a main material metering unit, an auxiliary agent metering unit, a mixing unit and an auxiliary agent feeding unit;
the main material conveying pipeline (1) is sequentially provided with a first reversing valve (2) and a mixing nozzle (3) according to the material flow direction;
the first reversing valve (2) comprises a first main material outlet and a second main material outlet, the first main material outlet is connected to the main material metering unit, the second main material outlet is connected to the mixing nozzle (3) along the main material conveying pipeline (1), and the first reversing valve and the second reversing valve are used for switching the flow direction of the main material conveyed by the main material conveying pipeline (1) by switching the first main material outlet and the second main material outlet;
the main material metering unit is used for metering the feeding amount of the main material to the mixing unit;
the auxiliary agent metering units are n and are used for respectively metering the feeding amount of n auxiliary agents to the mixing unit, and n is more than or equal to 1;
the mixing unit is respectively connected with the main material metering unit and the auxiliary agent metering unit and is used for receiving and mixing the main material from the main material metering unit and the auxiliary agent from the auxiliary agent metering unit so as to pre-mix and dilute the auxiliary agent from the auxiliary agent metering unit by using the main material from the main material metering unit to obtain a premix;
the mixing nozzle (3) comprises an inlet and an outlet, the inlet is connected to the mixing unit, the outlet is connected to the main material conveying pipeline (1) and is used for conveying the premix from the mixing unit into the main material conveying pipeline (1) to be mixed with the main material therein;
the mixing spray head (3) is a double-channel coaxial jet flow, sequentially comprises a spray head main body (31) and an undisturbed section (32) from top to bottom, and is connected to the main material conveying pipeline (1) through the undisturbed section (32);
the interior of the mixing nozzle (3) is also provided with an anti-interference ring (33), and the anti-interference ring (33) is fixedly arranged at the joint of the nozzle main body (31) and the non-interference section (32).
2. The mixing system of claim 1,
the main material metering unit comprises a main material inlet pipeline (4), a main material bin (5), a first screw conveyor (6), a main material outlet pipeline (7) and a first cutoff valve (8);
the top of the main material bin (5) is respectively provided with a main material feeding hole and a main material seat bin dust remover (51), the middle part of the main material bin is provided with a main material weighing module (52), and the bottom of the main material bin is provided with a main material discharging hole;
the first reversing valve (2) is connected with the main material bin (5) through the main material bin inlet pipeline (4), the first end of the main material bin inlet pipeline (4) is connected to a first main material outlet of the first reversing valve (2), and the second end of the main material bin inlet pipeline is connected to a main material feeding hole in the top of the main material bin (5);
the main material bin (5) is connected to a feeding hole of the first spiral conveyor (6) through a main material discharging hole in the bottom of the main material bin;
the main material metering unit is connected with the mixing unit through a main material discharging pipeline (7), the first end of the main material discharging pipeline (7) is connected to the discharging hole of the first screw conveyor (6), and the second end of the main material discharging pipeline is connected to the mixing unit;
the first cut-off valve (8) is arranged on the main material outlet pipeline (7).
3. The mixing system of claim 1 or 2,
the additive metering unit comprises an additive inlet pipeline (9), an additive bin (10), a second spiral conveyor (11), an additive outlet pipeline (12) and a second cut-off valve (13);
the top of the additive storage bin (10) is respectively provided with an additive feeding hole and an additive seat bin dust remover (101), the middle part of the additive storage bin is provided with an additive weighing module (102), and the bottom of the additive storage bin is provided with an additive discharging hole; the additive feeding pipeline (9) is connected to an additive feeding hole in the top of the additive storage bin (10);
the auxiliary agent bin (10) is connected to a feeding hole of the second spiral conveyor (11) through an auxiliary agent discharging hole in the bottom of the auxiliary agent bin;
the auxiliary agent metering unit is connected with the mixing unit through an auxiliary agent outlet pipeline (12), a first end of the auxiliary agent outlet pipeline (12) is connected to a discharge hole of the second spiral conveyor (11), and a second end of the auxiliary agent outlet pipeline is connected to the mixing unit;
the second stop valve (13) is arranged on the auxiliary agent outlet pipeline (12).
4. The mixing system according to claim 3, characterized in that the mixing unit comprises a mixing device (14), a premix discharge line (15), a third shut-off valve (16) and a rotary valve (17);
the top of the mixing equipment (14) is provided with a main material feeding hole and an auxiliary material feeding hole, the middle part of the mixing equipment is provided with a premix weighing module (141), the bottom of the mixing equipment is provided with a premix discharging hole, the main material feeding hole at the top of the mixing equipment is connected with the second end of the main material discharging pipeline (7), the auxiliary material feeding hole at the top of the mixing equipment is connected with the second end of the auxiliary material discharging pipeline (12), and the main material feeding hole and the auxiliary material are used for feeding the main material and the auxiliary material to be mixed and then outputting the premix from the premix discharging hole;
the mixing unit is connected with the auxiliary agent feeding unit through the premix discharging pipeline (15), the first end of the premix discharging pipeline (15) is connected to a premix discharging port at the bottom of the mixing device (14), and the second end of the premix discharging pipeline is connected to the auxiliary agent feeding unit;
the third cut-off valve (16) and the rotary valve (17) are sequentially arranged on the premix discharging pipeline (15) according to the material flow direction.
5. The mixing system according to claim 4, wherein the auxiliary agent feeding unit comprises an air source device (18), an air source conveying pipeline (19), an accelerator (20) and a premix conveying pipeline (21) which are sequentially communicated;
the accelerator (20) comprises a first feeding hole, a second feeding hole and a discharging hole, the accelerator is connected to the air source conveying pipeline (19) through the first feeding hole, connected to the second end of the premix discharging pipeline (15) through the second feeding hole, and connected to the first end of the premix conveying pipeline (21) through the discharging hole, the second end of the premix conveying pipeline (21) is connected to the inlet of the mixing nozzle (3) and used for conveying premix from the premix discharging pipeline (15) to the mixing nozzle (3) through the premix conveying pipeline (21) by utilizing air source power from the air source conveying pipeline (19).
6. The mixing system according to any one of claims 1-2 and 4-5, wherein the installation angle of the mixing nozzle (3) on the main material conveying pipeline (1) is 60-120 °, and the installation angle is the included angle between the central axis of the mixing nozzle (3) and the material flow direction of the main material conveying pipeline (1).
7. The mixing system according to claim 6, wherein the tamper-proof ring (33) comprises an inner ring (331), an outer ring (332) and a fixing rod (333); the inner ring (331) and the outer ring (332) are coaxially arranged through the fixing rod (333); the number of the fixing rods (333) is 2, the fixing rods are fixed on the inner ring (331) and the outer ring (332) in a crossed mode, and the crossed point of the fixing rods coincides with the centers of the inner ring (331) and the outer ring (332).
8. The mixing system of claim 6,
the sprayer body (31) comprises a powder passage (311) and an air flow passage (312) which are sequentially arranged from the center to the periphery in the same central axis; the powder channel (311) comprises a first straight cylinder section and a first contraction section which are sequentially arranged from top to bottom, and the airflow channel (312) comprises a second straight cylinder section and a second contraction section which are sequentially arranged from top to bottom; the upper edge of the first straight cylinder section is higher than the upper edge of the second straight cylinder section, and the lower edges of the first contraction section and the second contraction section are positioned at the same height;
and a fluid disturbing body (313) is further arranged in the spray head main body (31), and the fluid disturbing body (313) is arranged in the powder channel (311) and is positioned at the joint of the first straight cylinder section and the first contraction section.
9. The mixing system according to claim 8, characterized in that the turbulent fluid (313) comprises an upper cone and a lower cone, respectively connected symmetrically and fixedly by a bottom surface.
10. The mixing system of claim 8, wherein the bottom surfaces of the upper and lower cones are in the same plane as the lower edge of the first cylindrical section.
11. The mixing system of claim 8, wherein the cone angles of the upper and lower cones are each 30-90 °.
12. A mixing process for mixing in-line powder in a pipeline by using the mixing system of any one of claims 1 to 11.
13. The mixing process according to claim 12, characterized in that it comprises the following steps:
(1) Switching the first reversing valve (2) to a first main material outlet of the first reversing valve, starting material conveying in the main material conveying pipeline (1), and conveying the main materials to the main material metering unit through the main material conveying pipeline (1), the first reversing valve (2) and the first main material outlet of the first reversing valve;
(2) Respectively conveying n auxiliary agents into n auxiliary agent metering units, wherein n is more than or equal to 1;
(3) Simultaneously feeding the main material from the main material metering unit and the auxiliary agent from the auxiliary agent metering unit into the mixing unit according to the proportion respectively for mixing, and premixing the auxiliary agent by using the main material to obtain a premix;
(4) Switching a first reversing valve (2) to a second main material outlet of the mixing unit, and spraying the premix from the mixing unit into the main material conveying pipeline (1) through the mixing nozzle (3) to be mixed with the main material in the main material conveying pipeline;
(5) Repeating the steps (1) to (4) to continuously perform the system.
14. The mixing process according to claim 13, characterized in that it comprises the following steps:
(1) Switching the first reversing valve (2) to a first main material outlet of the first reversing valve, starting material conveying in the main material conveying pipeline (1), conveying the main materials into a main material bin (5) of the main material metering unit through the main material conveying pipeline (1), the first reversing valve (2), the first main material outlet of the first reversing valve and a main material bin inlet pipeline (4), and stopping material conveying in the main material conveying pipeline (1) when the main materials entering the main material bin reach the high material level of the main material weighing module (52);
(2) N auxiliary agents are respectively conveyed into auxiliary agent bins (10) of n auxiliary agent metering units through respective auxiliary agent bin inlet pipelines (9), and when the auxiliary agents entering the auxiliary agent bins reach the high material level of the auxiliary agent weighing module (102), the material conveying of the auxiliary agent bin inlet pipelines (9) is stopped, wherein n is more than or equal to 1;
(3) Opening a first cut-off valve (8) and a second cut-off valve (13), feeding the main material from the main material metering unit into a first spiral conveyor (6) from a main material discharge port at the bottom of a main material bin (5) according to the proportion of the main material and the auxiliary agent, outputting the main material to mixing equipment (14) of a mixing unit through a main material outlet pipeline (7), simultaneously feeding the auxiliary agent from the auxiliary agent metering unit into a second spiral conveyor (11) from an auxiliary agent discharge port at the bottom of an auxiliary agent bin (10), outputting the auxiliary agent to the mixing equipment (14) of the mixing unit through an auxiliary agent outlet pipeline (12), stopping the first spiral conveyor (6) and the second spiral conveyor (11) after the main material and the auxiliary agent entering the mixing equipment respectively reach required amounts, closing the first cut-off valve (8) and the second cut-off valve (13), and mixing for 5-45min in the mixing equipment (14) to obtain premix;
(4) Switching the first reversing valve (2) to a second main material outlet of the first reversing valve, starting the air source device (18), opening the third cut-off valve (16) and the rotary valve (17), adjusting the flow of the rotary valve (17), and conveying the air source into the accelerator (20) through the air source conveying pipeline (19) so as to drive the premix output from the premix discharge pipeline (15) to the accelerator (20) to be conveyed to the mixing nozzle (3) through the premix conveying pipeline (21), and sprayed into the main material conveying pipeline (1) through the mixing nozzle (3) to be mixed with the main materials in the main material conveying pipeline;
(5) When the premix in the mixing device (14) in the mixing unit reaches the low level of the premix weighing module (141), the rotary valve (17) is closed and steps (1) to (4) are repeated to allow the system to continue.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111632199.6A CN114259927B (en) | 2021-12-28 | 2021-12-28 | Mixing system and mixing process for online powder in pipeline |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111632199.6A CN114259927B (en) | 2021-12-28 | 2021-12-28 | Mixing system and mixing process for online powder in pipeline |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106110995A (en) * | 2016-08-24 | 2016-11-16 | 云南冶金新立钛业有限公司 | Coating device and the control method of coating device |
| CN206935288U (en) * | 2017-06-09 | 2018-01-30 | 青岛软控机电工程有限公司 | A kind of cell size mixing equipment |
| CN108163581A (en) * | 2017-11-28 | 2018-06-15 | 荆门市格林美新材料有限公司 | A kind of automatic conveying system |
| CN109589810A (en) * | 2018-11-13 | 2019-04-09 | 东旭科技集团有限公司 | A kind of raw material mixing system and method for liquid-crystalline glasses |
| CN110877416A (en) * | 2019-11-26 | 2020-03-13 | 江苏一夫科技股份有限公司 | Mixing arrangement of hemihydrate gypsum and additive |
| CN110944756A (en) * | 2017-07-21 | 2020-03-31 | 喷雾系统(日本)有限责任公司 | Two-fluid nozzle |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| AT413092B (en) * | 2003-05-12 | 2005-11-15 | Steinwald Kurt | Bulk powder dosing and mixing assembly has a number of hoppers located side-by-side each with an integral dose regulator |
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Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106110995A (en) * | 2016-08-24 | 2016-11-16 | 云南冶金新立钛业有限公司 | Coating device and the control method of coating device |
| CN206935288U (en) * | 2017-06-09 | 2018-01-30 | 青岛软控机电工程有限公司 | A kind of cell size mixing equipment |
| CN110944756A (en) * | 2017-07-21 | 2020-03-31 | 喷雾系统(日本)有限责任公司 | Two-fluid nozzle |
| CN108163581A (en) * | 2017-11-28 | 2018-06-15 | 荆门市格林美新材料有限公司 | A kind of automatic conveying system |
| CN109589810A (en) * | 2018-11-13 | 2019-04-09 | 东旭科技集团有限公司 | A kind of raw material mixing system and method for liquid-crystalline glasses |
| CN110877416A (en) * | 2019-11-26 | 2020-03-13 | 江苏一夫科技股份有限公司 | Mixing arrangement of hemihydrate gypsum and additive |
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