CN107055099B - Dense-phase conveying method and system for urea particles - Google Patents

Dense-phase conveying method and system for urea particles Download PDF

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Publication number
CN107055099B
CN107055099B CN201710059655.XA CN201710059655A CN107055099B CN 107055099 B CN107055099 B CN 107055099B CN 201710059655 A CN201710059655 A CN 201710059655A CN 107055099 B CN107055099 B CN 107055099B
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dense
charging barrel
pipe
valve
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CN107055099A (en
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杨腾
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Shanghai Bolong Equipment Technology Co ltd
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65G—TRANSPORT OR STORAGE DEVICES, e.g. CONVEYORS FOR LOADING OR TIPPING, SHOP CONVEYOR SYSTEMS OR PNEUMATIC TUBE CONVEYORS
    • B65G53/00—Conveying materials in bulk through troughs, pipes or tubes by floating the materials or by flow of gas, liquid or foam
    • B65G53/34—Details
    • B65G53/36—Arrangements of containers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65G—TRANSPORT OR STORAGE DEVICES, e.g. CONVEYORS FOR LOADING OR TIPPING, SHOP CONVEYOR SYSTEMS OR PNEUMATIC TUBE CONVEYORS
    • B65G53/00—Conveying materials in bulk through troughs, pipes or tubes by floating the materials or by flow of gas, liquid or foam
    • B65G53/04—Conveying materials in bulk pneumatically through pipes or tubes; Air slides
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65G—TRANSPORT OR STORAGE DEVICES, e.g. CONVEYORS FOR LOADING OR TIPPING, SHOP CONVEYOR SYSTEMS OR PNEUMATIC TUBE CONVEYORS
    • B65G53/00—Conveying materials in bulk through troughs, pipes or tubes by floating the materials or by flow of gas, liquid or foam
    • B65G53/34—Details
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65G—TRANSPORT OR STORAGE DEVICES, e.g. CONVEYORS FOR LOADING OR TIPPING, SHOP CONVEYOR SYSTEMS OR PNEUMATIC TUBE CONVEYORS
    • B65G53/00—Conveying materials in bulk through troughs, pipes or tubes by floating the materials or by flow of gas, liquid or foam
    • B65G53/34—Details
    • B65G53/40—Feeding or discharging devices
    • B65G53/46—Gates or sluices, e.g. rotary wheels

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Air Transport Of Granular Materials (AREA)

Abstract

A dense-phase conveying method and system for urea particles comprises a dense-phase conveying air source control unit, a rotary blanking valve unit, a dense-phase elutriator and a tail gas treatment unit. The urea particle hopper feeds materials to a dense-phase conveying pipeline through a rotary blanking valve, a material plug and conveying gas in the dense-phase conveying pipeline tangentially enter a charging barrel of a dense-phase elutriator, continuous materials and gas are realized at the upper part of the charging barrel, material flow is accelerated through an accelerating tube, the particle materials discharged from the accelerating tube are separated from air flow due to inertia, the particle materials are separated from powder, the particle materials enter a material collecting hopper and then enter a downstream material bin through a gravity rotary valve; the powder material enters the waste gas pipeline along with the airflow in the reverse direction and is carried out of the hopper; the tail gas carried with the powder enters a bag filter, the powder is captured, and the gas is discharged after being filtered. The invention firstly provides a concept of a dense phase elutriator, and the continuous separation of uric acid powder and granules under the dense phase condition can be realized by a material plug in a pipeline through the device.

Description

Dense-phase conveying method and system for urea particles
Technical Field
The invention relates to a material conveying technology, in particular to a dense-phase conveying method and a dense-phase conveying system for urea particles.
Background
In view of the characteristics of flexible arrangement of pipelines, environmental protection, convenient maintenance, simple control system and the like in the air flow conveying process, some urea manufacturers and urea users hope to adopt an air flow conveying mode to convey materials.
Since urea granules are brittle, the use of dilute phase gas stream transport (typically at transport speeds greater than 20 meters per second) tends to cause urea granules to break up.
The urea particles are carried with partial powder, and partial dust is inevitably generated in the conveying process, so that the dense-phase air flow conveying (the conveying speed is less than 10 meters per second) is hoped to reduce the particle crushing, and the separation of the granules and the powder is basically realized before the urea particles enter a target storage bin.
Disclosure of Invention
The invention aims to provide a urea particle dense-phase conveying method and system, which integrates dense-phase airflow conveying and dense-phase conveying for realizing the separation of urea particles and dust under a dense-phase condition.
In order to achieve the purpose, the technical scheme of the invention is as follows:
a dense-phase conveying system for urea particles comprises a dense-phase conveying air source control unit, a dense-phase conveying air source control unit and a dense-phase conveying air source control unit, wherein the dense-phase conveying air source control unit comprises a pressure reducing valve, three groups of Laval pipes and corresponding pneumatic butterfly valves which are arranged in sequence; the pressure reducing valve is arranged in a system air source pipeline; the three groups of the pull-down pipes and the corresponding pneumatic butterfly valves are arranged in parallel on the outlet pipeline of the pressure reducing valve; the rotary blanking valve unit is arranged in an outlet pipeline of the hopper and comprises a rotary blanking valve, a leaked gas filter and a pressure sensor; the outlet pipeline of the hopper is connected to the pipelines at the outlet ends of the three groups of the cutting pipes of the dense-phase conveying gas source control unit, and the rotary blanking valve and the leakage gas filter are arranged in the outlet pipeline of the hopper; the pressure sensor is arranged in the pipelines at the outlet ends of the three groups of the pull-down pipes of the dense-phase conveying air source control unit; the leakage gas of the rotary blanking valve is discharged through a gas filter, and the rotary valve is interlocked with the pressure sensor; the dense-phase elutriator comprises a charging barrel, wherein a conveying feeding port is arranged on the side surface of the charging barrel and is connected with an outlet pipeline of a hopper through a pipeline; the lower part of the charging barrel is conical, and a discharge hole is formed in the bottom of the charging barrel; the central tube is vertically inserted into the center of the charging barrel from the upper end of the charging barrel, and the lower port of the central tube is positioned above the opening at the bottom of the charging barrel; the upper part of the central pipe is provided with a plurality of air inlets along the circumferential direction; the upper port of the accelerating tube is connected with the discharge hole at the bottom of the charging barrel, and the lower port of the accelerating tube is in a horn shape; the collecting hopper is a cylinder and comprises a connecting pipe, the connecting pipe is sleeved outside the accelerating pipe, and the upper end opening of the collecting hopper is connected with the discharge hole at the bottom of the charging cylinder; the upper end and the lower end of the aggregate body are conical, and the upper port is connected with the lower port of the connecting pipe; the lower port is a discharge port and a gravity rotary valve; a material level meter is arranged in the middle of the aggregate body; the waste gas discharge pipe is annular, is sleeved outside the collecting hopper connecting pipe and is communicated with the connecting pipe through a connecting branch pipe; the tail gas treatment unit comprises a filter, a tail gas exhaust pipe and a tail gas treatment unit, wherein the filter is connected with the waste gas exhaust pipe through a pipeline, and the pipeline is provided with a gas flow regulating valve; and the controller is electrically connected with the pneumatic butterfly valve, the pressure sensor, the rotary blanking valve, the gravity rotary valve and the material level meter respectively.
Preferably, a spare exhaust port is arranged in the center of the top of the charging barrel, the upper end of the central tube is opened and corresponds to the spare exhaust port, the central tube is connected with the filter through a pipeline, and a gas flow regulating valve is arranged in the pipeline.
Preferably, the filter is a bag filter.
The invention discloses a method for conveying a dense-phase conveying system of urea particles, which comprises the following steps:
a) The dense-phase conveying gas source provides stable gas source pressure through a pressure reducing valve, three groups of cutting pipes and corresponding pneumatic butterfly valves are arranged, the first group of cutting pipes provides gas flow required by normal conveying for the system, the second group of cutting pipes provides gas leakage amount for the rotary blanking valve, and the third group of cutting pipes provides gas supplementing amount required by pipeline purging for the system;
b) Feeding the urea particle hopper to the system through a rotary blanking valve, discharging gas leaked from the rotary valve through a gas filter, interlocking the rotating speed of the rotary valve with a pressure sensor, and reducing the rotating speed of the rotary valve to reduce the conveying pressure when the conveying pressure is greater than 20-50% of the set conveying pressure;
c) The material plug and the conveying gas from the dense phase conveying pipeline tangentially enter a material cylinder of the dense phase elutriator, the continuous material and gas are realized at the upper part of the material cylinder, the air inlet speed of a central pipe in the material cylinder is between 20s and 30m/s, and the blanking speed of a hopper outlet pipeline under a rotary blanking valve is the same as the blanking speed of the material passing through a gap between the central pipe and a cone part of the material cylinder; the material flow is accelerated to 25-35 m/s through the accelerating pipe, the particles out of the accelerating pipe are separated from the air flow due to inertia, the particles are separated from the powder, the particles enter the aggregate bin and then enter a downstream bin through the gravity rotary valve; the powder enters the waste gas pipeline along with the reverse direction of the airflow and is carried out of the hopper;
d) The tail gas from the dense phase elutriator, carrying powder, enters the bag filter, the powder is captured, and the gas is filtered by the bag filter and then discharged after reaching the standard.
Further, a spare exhaust port is arranged in the center of the top of the charging barrel, the upper end of the central tube is opened and corresponds to the spare exhaust port, the central tube is connected with the filter through a pipeline, and the pipeline is provided with a gas flow regulating valve for regulating the gas flow entering the accelerating tube.
Preferably, the bag filter has an automatic back-blowing self-cleaning function.
The invention relates to a dense phase elutriator, which comprises a charging barrel, a feeding port, an exhaust port, a conical lower part and a discharge port, wherein the side surface of the charging barrel is provided with the feeding port; the central tube is vertically inserted into the center of the charging barrel from the upper end of the charging barrel, and the lower port of the central tube is positioned above the opening at the bottom of the charging barrel; the upper part of the central pipe is provided with a plurality of air inlets along the circumferential direction; the upper end opening of the accelerating tube is connected with the discharge hole at the bottom of the charging barrel; the collecting hopper is a cylinder and comprises a connecting pipe, the connecting pipe is sleeved outside the accelerating pipe, and the upper end opening of the collecting hopper is connected to the discharge opening at the bottom of the charging barrel; the upper end and the lower end of the body are conical, and the upper port is connected with the lower port of the connecting pipe; the lower port is a discharge port; and the waste gas discharge pipe is annular, is sleeved outside the collecting hopper connecting pipe and is communicated with the connecting pipe through a connecting branch pipe.
Preferably, the lower port of the accelerating tube is in a trumpet shape.
Preferably, the center of the top of the charging barrel is provided with a standby exhaust port and an exhaust pipe, the upper end of the central pipe is opened and corresponds to the standby exhaust port, and the exhaust pipe is provided with a gas flow regulating valve
The invention has the beneficial effects that:
the invention firstly provides a concept of a dense phase elutriator, and the continuous separation of uric acid powder and granules under the dense phase condition can be realized by a material plug in a pipeline through the device.
Drawings
FIG. 1 is a schematic diagram of the configuration of an embodiment of the dense phase transport system for urea granules according to the present invention.
FIG. 2 is a schematic diagram of the dense phase elutriator in accordance with an embodiment of the present invention.
Detailed Description
Referring to fig. 1 and 2, the dense phase conveying system for urea particles of the present invention comprises,
the dense-phase conveying gas source control unit 1 comprises a pressure reducing valve 11, three groups of Laval pipes 12-14 and corresponding pneumatic butterfly valves F1-F3 which are arranged in sequence; wherein, the pressure reducing valve 11 is arranged in the system air source pipeline 100; the three groups of the pull-down pipes 12 to 14 and the corresponding pneumatic butterfly valves F1 to F3 connected in series are arranged in parallel on an outlet pipeline of the pressure reducing valve 11;
a rotary blanking valve unit 2, which is arranged in an outlet pipeline 201 of the hopper 200 and comprises a rotary blanking valve 21, a leakage gas filter 22 and a pressure sensor 23; the hopper outlet pipeline 201 is connected to the pipelines at the outlet ends of the three groups of the cutting pipes of the dense-phase conveying gas source control unit 1, and the rotary blanking valve 21 and the leakage gas filter 22 are arranged in the hopper outlet pipeline 201; the pressure sensor 23 is arranged in the pipelines at the outlet ends of the three groups of the cutting pipes of the dense phase conveying air source control unit 1; the leakage gas of the rotary blanking valve is discharged through a gas filter, and the rotary valve is interlocked with the pressure sensor;
the dense phase elutriator 3, comprising,
a feed inlet 311 is arranged on the side surface of the charging barrel 31 and is connected with the hopper outlet pipeline 201 through a pipeline; the lower part of the charging barrel 31 is conical, and a discharge hole 312 is formed at the bottom;
a central tube 32 vertically inserted into the center of the charging barrel 31 from the upper end of the charging barrel 31, and the lower end opening of the central tube 32 is positioned above the bottom opening of the charging barrel 31; the upper part of the central tube 32 is provided with a plurality of air inlets 321 along the circumferential direction;
an accelerating tube 33, the upper port of which is connected with the discharge port at the bottom of the charging barrel 31, and the lower port of which is in a horn shape; the collection hopper 34, which is a cylinder, includes,
the connecting pipe 341 is sleeved outside the accelerating tube, and the upper end opening of the connecting pipe 341 is connected with the discharge hole at the bottom of the charging barrel;
the upper end and the lower end of the aggregate body 342 are conical, and the upper port is connected with the lower port of the connecting pipe 341; the lower port is a discharge port and a gravity rotary valve 343; aggregate body mid-design level gauge 346;
an exhaust gas discharge pipe 344, which is annular, is sleeved outside the collecting hopper connection pipe 341, and is communicated with the connection pipe 341 through a connection branch pipe 345;
an exhaust gas treatment unit 4 including a filter 41 connected to the exhaust gas discharge pipe 344 through a pipe;
and the pneumatic butterfly valves F1 to F3, the pressure sensor 23, the rotary blanking valve 21, the gravity rotary valve 343 and the level gauge 346 are respectively and electrically connected with a controller (not shown).
Preferably, a spare exhaust port 313 is provided in the center of the top of the cartridge 31, the upper end of the central tube 32 is open and corresponds to the spare exhaust port 313, the filter 41 is connected through a pipeline, and a gas flow regulating valve 42 is provided in the pipeline.
Preferably, the filter 41 is a bag filter.
The invention discloses a method for conveying a dense-phase conveying system of urea particles, which comprises the following steps:
a) The dense-phase conveying gas source provides stable gas source pressure through a pressure reducing valve, and three groups of cutting pipes and corresponding pneumatic butterfly valves are arranged, wherein the first group of cutting pipes provides gas flow required by normal conveying for the system, the second group of cutting pipes provides gas leakage amount for the rotary blanking valve, and the third group of cutting pipes provides gas supplementing amount required by pipeline purging for the system;
b) Feeding the urea particle hopper to a system through a rotary blanking valve, discharging leaked gas from the rotary valve through a gas filter, interlocking the rotating speed of the rotary valve with a pressure sensor, and reducing the rotating speed of the rotary valve to reduce the conveying pressure when the conveying pressure is greater than 20-50% of the set conveying pressure;
c) The material bolt and the conveying gas from the dense phase conveying pipeline enter a material cylinder of the dense phase elutriator in a tangential direction, the continuous material and gas are realized at the upper part of the material cylinder, the air inlet speed of a central pipe in the material cylinder is between 20 and 30m/s, and the blanking speed of a hopper outlet pipeline under a rotary blanking valve is the same as the blanking speed of the material passing through a gap between the central pipe and a cone part of the material cylinder; the material flow is accelerated to 25-35 m/s through the accelerating pipe, the particles out of the accelerating pipe are separated from the air flow due to inertia, the particles are separated from the powder, the particles enter the aggregate bin and then enter a downstream bin through the gravity rotary valve; the powder enters the waste gas pipeline along with the reverse direction of the airflow and is carried out of the hopper;
d) The tail gas from the dense phase elutriator, carrying powder, enters a filter (bag filter), the powder is captured, and the gas is filtered by the bag filter and then discharged after reaching the standard.
Further, a spare exhaust port is arranged in the center of the top of the charging barrel, the upper end of the central tube is opened and corresponds to the spare exhaust port, the central tube is connected with the filter through a pipeline, and the pipeline is provided with a gas flow regulating valve for regulating the gas flow entering the accelerating tube.
Preferably, the bag filter has an automatic back blowing and self cleaning function.

Claims (7)

1. A dense phase transport system for urea particles, comprising,
the dense-phase conveying air source control unit comprises a pressure reducing valve, three groups of Laval pipes and corresponding pneumatic butterfly valves which are arranged in sequence; the pressure reducing valve is arranged in a system air source pipeline; the three groups of the pull-down pipes and the corresponding pneumatic butterfly valves are arranged in parallel on the outlet pipeline of the pressure reducing valve;
the rotary blanking valve unit is arranged in an outlet pipeline of the hopper and comprises a rotary blanking valve, a leaked gas filter and a pressure sensor; the outlet pipeline of the hopper is connected to the pipelines at the outlet ends of the three groups of the cutting pipes of the dense-phase conveying gas source control unit, and the rotary blanking valve and the leakage gas filter are arranged in the outlet pipeline of the hopper; the pressure sensor is arranged in the pipelines at the outlet ends of the three groups of the pull-down pipes of the dense-phase conveying air source control unit; the leaked gas of the rotary blanking valve is discharged through a gas filter, and the rotary valve is interlocked with the pressure sensor;
the dense-phase elutriator comprises a dense-phase elutriator body and a dense-phase elutriator body, wherein,
the side surface of the charging barrel is provided with a conveying feeding hole and is connected with the outlet pipeline of the hopper through a pipeline; the lower part of the charging barrel is conical, and a discharge hole is formed in the bottom of the charging barrel;
the central tube is vertically inserted into the center of the charging barrel from the upper end of the charging barrel, and the lower port of the central tube is positioned above the opening at the bottom of the charging barrel; the upper part of the central pipe is provided with a plurality of air inlets along the circumferential direction;
the upper port of the accelerating tube is connected with the discharge hole at the bottom of the charging barrel, and the lower port of the accelerating tube is in a horn shape;
the collecting hopper is a cylinder body and comprises,
the connecting pipe is sleeved outside the accelerating tube, and the upper end opening of the connecting pipe is connected to the discharge opening at the bottom of the charging barrel;
the upper end and the lower end of the aggregate body are conical, and the upper port is connected with the lower port of the connecting pipe; the lower port is a discharge port and a gravity rotary valve; a material level meter is arranged in the middle of the aggregate body;
the waste gas discharge pipe is annular, is sleeved outside the collecting hopper connecting pipe and is communicated with the connecting pipe through a connecting branch pipe; the tail gas treatment unit comprises a tail gas treatment unit,
the filter is connected with the waste gas discharge pipe through a pipeline;
and the controller is electrically connected with the pneumatic butterfly valve, the pressure sensor, the rotary blanking valve, the gravity rotary valve and the material level meter respectively.
2. The dense phase transport system for urea particles as claimed in claim 1, wherein said cartridge has a spare gas outlet at the top center, said central tube is open and corresponding to said spare gas outlet, said filter is connected by a pipeline, and a gas flow regulating valve is provided in said pipeline.
3. The dense phase urea particle transport system of claim 1 or 2, wherein the filter is a bag filter.
4. The method of claim 1, comprising:
a) The dense-phase conveying gas source provides stable gas source pressure through a pressure reducing valve, three groups of cutting pipes and corresponding pneumatic butterfly valves are arranged, the first group of cutting pipes provides gas flow required by normal conveying for the system, the second group of cutting pipes provides gas leakage amount for the rotary blanking valve, and the third group of cutting pipes provides gas supplementing amount required by pipeline purging for the system;
b) Feeding the urea particle hopper to a system through a rotary blanking valve, discharging leaked gas from the rotary valve through a gas filter, interlocking the rotating speed of the rotary valve with a pressure sensor, and reducing the rotating speed of the rotary valve to reduce the conveying pressure when the conveying pressure is greater than 20-50% of the set conveying pressure;
c) The material bolt and the conveying gas from the dense phase conveying pipeline tangentially enter a material cylinder of the dense phase elutriator, the continuous material and gas are realized at the upper part of the material cylinder, the air inlet speed of a central pipe in the material cylinder is controlled between 20 and 30m/s, and the blanking speed of a hopper outlet pipeline under a rotary blanking valve is the same as the blanking speed of the material passing through a gap between the central pipe and a cone part of the material cylinder; the material flow is accelerated to 25-35 m/s through the accelerating pipe, the particles discharged from the accelerating pipe are separated from the air flow due to inertia, the particles are separated from the powder, the particles enter the aggregate bin, and then enter a downstream bin through the gravity rotary valve; the powder enters the waste gas pipeline along with the reverse direction of the airflow and is carried out of the hopper;
d) The tail gas from the dense phase elutriator, carrying powder, enters the bag filter, the powder is captured, and the gas is filtered by the bag filter and then discharged after reaching the standard.
5. The method of claim 4, wherein the cartridge is provided with a spare gas outlet at the top center thereof, the central tube is opened at the upper end thereof to correspond to the spare gas outlet, the filter is connected to the central tube through a pipe, and the pipe is provided with a gas flow rate regulating valve for regulating the flow rate of the gas into the acceleration tube.
6. The method for conveying urea granules dense phase conveying system of claim 4, characterized in that the bag filter has automatic back blowing self-cleaning function.
7. A dense phase elutriator for dense phase transportation of urea particles is characterized by comprising a charging barrel, a feeding port is arranged on the side surface of the charging barrel, the lower part of the charging barrel is conical, and a discharging port is arranged at the bottom of the charging barrel; a standby exhaust port and an exhaust pipe are arranged in the center of the top of the charging barrel, and a gas flow regulating valve is arranged on the exhaust pipe;
the central tube is vertically inserted into the center of the charging barrel from the upper end of the charging barrel, and the lower port of the central tube is positioned above the opening at the bottom of the charging barrel; the upper part of the central pipe is provided with a plurality of air inlets along the circumferential direction; an opening at the upper end of the central pipe corresponds to the standby exhaust port;
the upper end opening of the accelerating tube is connected with the discharge hole at the bottom of the charging barrel; the lower port of the accelerating tube is in a horn shape;
the collecting hopper is a cylinder body and comprises,
the connecting pipe is sleeved outside the accelerating pipe, and the upper end opening of the connecting pipe is connected with the discharge opening at the bottom of the charging barrel;
the upper end and the lower end of the body are conical, and the upper port is connected with the lower port of the connecting pipe; the lower port is a discharge port;
and the waste gas discharge pipe is annular, is sleeved outside the collecting hopper connecting pipe and is communicated with the connecting pipe through a connecting branch pipe.
CN201710059655.XA 2017-01-24 2017-01-24 Dense-phase conveying method and system for urea particles Active CN107055099B (en)

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