CN210113231U - Powder conveying system - Google Patents

Powder conveying system Download PDF

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Publication number
CN210113231U
CN210113231U CN201920261871.7U CN201920261871U CN210113231U CN 210113231 U CN210113231 U CN 210113231U CN 201920261871 U CN201920261871 U CN 201920261871U CN 210113231 U CN210113231 U CN 210113231U
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powder
gas
channel
air
conveying
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谭险峰
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CHENGDU RUIKELIN ENGINEERING TECHNOLOGY CO LTD
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CHENGDU RUIKELIN ENGINEERING TECHNOLOGY CO LTD
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Abstract

The utility model relates to a powder conveying system, including helping blowing the tonifying qi passageway, should help blowing the tonifying qi passageway give vent to anger the end and be connected the conveying channel who is transported the gas-solid two-phase flow to the target point, the exit end of the discharging pipe of exporting the gas-solid two-phase flow on the powder fluidizer is connected and is helped blowing the junction of tonifying qi passageway and conveying channel. Before the gas-solid two-phase flow is conveyed to a target point or at the same time of conveying the gas-solid two-phase flow to the target point, the blowing-assisting and gas-supplementing channel is opened. By the aid of the system, when the gas-solid two-phase flow is conveyed, the conveyed gas-solid two-phase flow is boosted in the conveying channel through the blowing-assisting and gas-supplementing channel, so that the conveying state of the gas-solid two-phase flow in the conveying channel can be controlled by controlling the blowing-assisting and gas-supplementing channel, and the blockage removing effect can be achieved.

Description

Powder conveying system
Technical Field
The utility model relates to a powder conveying system.
Background
In the conveying process of the existing powder, the friction between the powder and the pipe wall of the channel causes the abrasion of the conveying channel, and the service life of the conveying channel is greatly reduced.
Taking the dust removal and purification of blast furnace gas in the prior blast furnace as an example, a full-dry type pulse bin pump pressure relief filter structure dust removal device is generally adopted, and a pneumatic conveying jet pump conveys barrel powder to an ash bin for centralized storage and outward transportation. The ash conveying and discharging equipment on the dust removing device with the pressure-relief and filtering structure of the full-dry type pulse bin pump mainly has the problem of impact abrasion of high-speed and high-temperature powder on pipelines and valves, so that the environment is polluted, and the normal operation of a cylinder body or even the whole purifying device is greatly influenced. Although the dense phase pneumatic conveying process can greatly reduce the impact abrasion of powder on pipelines and valves compared with the dilute phase pneumatic conveying process, the ash conveying and discharging of the blast furnace gas dust removal device cannot be simply applied to the existing dense phase pneumatic conveying technology due to the limitation of the characteristics of the powder (blast furnace gas ash) deposited in the blast furnace gas dust removal device.
The applicant creates the ash conveying and discharging method and the ash conveying and discharging equipment of the blast furnace gas dust removing device, and the publication number is as follows: CN 103213844A. The ash conveying and discharging method and the ash conveying and discharging equipment of the blast furnace gas dust removing device can effectively improve the problem of pipeline abrasion. The method comprises the following steps: 1) opening a discharge valve at the bottom of the blast furnace gas dust removal device, and discharging powder deposited in the blast furnace gas dust removal device into a bin pump positioned below the discharge valve according to the discharge quantity requirement that the ash-gas ratio is 30-40 when subsequent pneumatic ash conveying is met; 2) starting a fluidizing device on the bin pump to fully fluidize the powder in the bin pump; 3) opening a discharge valve of a bin pump to enable powder in the bin pump to be discharged into a powder receiving bin through a double-sleeve pneumatic conveying channel connected with the discharge valve at an ash-to-gas ratio of 30-40; and 3) performing segmented air supplement on the double-sleeve pneumatic conveying channel through air supplement manifolds which are arranged in the length direction of the double-sleeve pneumatic conveying channel at intervals and are respectively and directly connected with an internal bypass pipe of the double-sleeve pneumatic conveying channel, wherein air supplement operation of each segment is controlled according to pressure detection of corresponding pipe sections of the double-sleeve pneumatic conveying channel.
SUMMERY OF THE UTILITY MODEL
The utility model aims to provide a through a better powder conveying system.
The technical scheme is that the powder conveying system comprises a blowing-assisting and gas-supplementing channel, wherein the gas outlet end of the blowing-assisting and gas-supplementing channel is connected with a conveying channel for conveying gas-solid two-phase flow to a target point, and the outlet end of a discharge pipe for outputting the gas-solid two-phase flow is connected with the joint of the blowing-assisting and gas-supplementing channel and the conveying channel.
Before the gas-solid two-phase flow is conveyed to a target point or at the same time of conveying the gas-solid two-phase flow to the target point, the blowing-assisting and gas-supplementing channel is opened. By the aid of the system, when the gas-solid two-phase flow is conveyed, the conveyed gas-solid two-phase flow is boosted in the conveying channel through the blowing-assisting and gas-supplementing channel, so that the conveying state of the gas-solid two-phase flow in the conveying channel can be controlled by controlling the blowing-assisting and gas-supplementing channel, and the blockage removing effect can be achieved.
Furthermore, the direction of the air outlet end of the blowing-assisting air-supplementing channel is the same as that of the input end of the conveying channel. Thus, the kinetic energy of the gas filled in the blowing-assisting and air-supplementing channel can be fully utilized.
Further, the conveying channel is a double-sleeve pneumatic conveying channel.
Furthermore, an assisting air supply system for supplying air to the conveying channel is arranged on the conveying channel;
the helping hand tonifying qi system includes:
the pressure detection unit comprises detection devices which are distributed on the conveying channel and are respectively used for detecting the air pressure in different channel sections on the conveying channel;
and the air supply unit comprises air supply input pipes which are distributed on the conveying channel and are used for supplying air to different channel sections on the conveying channel correspondingly, and the air supply input pipes are in communication connection with the corresponding detection devices through a control device.
In the process of conveying the gas-solid two-phase flow, when the pressure detection unit detects that the signal of a certain channel section is weakened or is lower than a certain set threshold value, the corresponding channel section is blocked or approaches to be blocked, the control device receives the detection signal and then controls the gas supplementing unit, and compressed gas is filled into the corresponding channel section from the gas supplementing input pipe to finish blockage removal.
In the conveying channel, the kinetic energy is transferred to a gas-solid two-phase bolt-shaped ash column by virtue of the blowing-assisted and air-supplementing channel to push the ash column to move forwards, but attenuation occurs, the pressure fluctuation of the ash column passing through a certain section is a key feedback signal for judging air-supplementing operation, and the ash column is pushed to move forwards by virtue of air supplementation under the condition of ceaseless blowing-assisted, so that a relay conveying process is formed, and the kinetic energy of powder can be conveyed to any destination at a speed lower than the speed generated by abrasion.
The powder conveying system further comprises a three-way pipe, wherein the first end of the three-way pipe is connected with the air outlet end of the blowing-assisting and air-supplementing channel, the second end of the three-way pipe is connected with the inlet end of the conveying channel, and the third end of the three-way pipe is connected with the outlet end of the discharge pipe; and at the end position where the double-sleeve pneumatic conveying channel is connected with the three-way pipe, the end of the inner bypass pipe of the double-sleeve pneumatic conveying channel corresponding to the three-way pipe is provided with a plug for plugging the end of the inner bypass pipe.
Further, the three-way pipe comprises a straight pipe part and a bent pipe part, and two ends of the straight pipe part are respectively connected with the blowing-assisting and air-supplementing channel and the conveying channel; one end of the elbow pipe part is connected with the middle part of the straight pipe part, and the other end of the elbow pipe part is connected with the discharge pipe.
Furthermore, the conveying channel comprises a conveying section and a connecting section, an inner bypass pipe sleeved in the pneumatic ash conveying main pipe in the conveying channel is positioned on the conveying section, and the connecting section is connected with a discharge pipe of the dispersed airflow diffusion cavity.
Further, the powder conveying system comprises an ash conveying mode, and the system comprises:
the powder fluidizing device is used for mixing gas and powder into gas-solid two-phase flow;
the conveying channel is used for conveying the gas-solid two-phase flow to a target point;
the blowing-assisting air-replenishing channel is connected with the conveying channel;
the air inlet pipes of the blowing-assisting air supply channel and the powder fluidizing device are connected with the same air source device or different air source devices;
in the powder conveying system, under the ash conveying mode, compressed gas is filled into the conveying channel through the blowing-assisting and air-supplementing channel.
Furthermore, at the connecting position of the elbow part and the straight pipe part, the extending direction of the end of the elbow part and the straight pipe part form an included angle of 10-35 degrees.
Further, the three-way pipe is respectively connected with a discharge pipe of the dispersed airflow diffusion cavity, a conveying channel and a blowing-assisting and air-supplementing channel through flanges.
Furthermore, one end of the blowing-assisting air supply channel is connected with an air inlet pipe of the powder fluidizing device, and the other end of the blowing-assisting air supply channel is communicated with the conveying channel.
Furthermore, one end of the blowing-assisting air-supplementing channel is connected with a second air source device, and the other end of the blowing-assisting air-supplementing channel is communicated with the conveying channel; the air inlet pipe is connected with a first air source device.
The utility model discloses a conveying method of powder.
The technical scheme provided by the utility model is, the conveying method of powder, include:
receiving powder to be conveyed by using a powder receiving mode of a powder fluidizing device;
the powder fluidization mode of the powder fluidization device is used for mixing gas with the powder to be conveyed through the gas inlet structure to form gas-solid two-phase flow;
the powder output mode of the powder fluidizing device is used for conveying the gas-solid two-phase flow to a target point through the discharge pipe;
the gas entering the gas inlet structure is dispersed into dispersed gas flow through the powder isolation and ventilation layer after passing through the gas inlet gas flow diffusion cavity and acts on the powder to be conveyed in the dispersed gas flow diffusion cavity so as to form the gas-solid two-phase flow.
Therefore, the gas flow is separated through the powder isolation breathable layer for isolating the powder and is dispersed, so that the dispersed gas flow is mixed with the powder to form a gas-solid two-phase flow, the powder is isolated by adopting the method, the gas flow enters the gas inlet gas flow diffusion cavity for diffusion and is dispersed through the powder isolation breathable layer, namely, the potential energy of compressed gas is converted into the kinetic energy of the powder, and the kinetic energy is uniformly transmitted by the powder fluidizing device, so that the gas-solid two-phase flow which can be uniformly fluidized and can ensure that the powder can be subjected to low-energy-consumption gas-solid long-distance conveying under the low-speed condition without wearing a pipeline.
Further, the powder isolation and ventilation layer comprises a porous ventilation film which can block at least most of the powder in the powder fluidization device on one side surface.
Further, the porous air-permeable film has a barrier rate of 99% or more against powder having a particle size of 0.1m or more among the above-mentioned powders.
Further, the porous breathable film is an expanded polytetrafluoroethylene film.
Expanded polytetrafluoroethylene filter membrane is a membrane formed by stretching and deforming (i.e. meaning "expanded") to form fibrous closed pores on polytetrafluoroethylene material. The film has the characteristics of extremely strong hydrophobicity and no ash adhesion, so that the film is not easy to generate the phenomenon of dewing and pasting under various weather conditions, and the purification and regeneration of the film can be easily realized through back blowing.
Further, the powder barrier vent layer includes a support provided on the other surface of the porous vent film, and the porous vent film is attached to the support.
Furthermore, the supporting body is made of breathable cloth.
The air-permeable cloth can be made of glass fiber woven cloth, P84 filter material, aramid fiber 1313 or PTFE woven cloth.
Furthermore, the air inlet structure comprises a clamping and positioning structure arranged outside the powder isolation and ventilation layer, the clamping and positioning structure is provided with a first clamping part positioned on one side surface of the powder isolation and ventilation layer, a second clamping part positioned on the other side of the powder isolation and ventilation layer and connected with the first clamping part, and opposite holes are formed in the first clamping part and the second clamping part.
Further, the output pressure of the gas-solid two-phase flow is not more than 0.25MPa, 0.24MPa, 0.23MPa, 0.22MPa, 0.21MPa, 0.2MPa, 0.19MPa, 0.18 MPa, 0.17MPa, 0.16MPa, 0.15MPa, 0.14MPa, 0.13MPa, 0.12MPa, 0.11MPa, 0.1MPa, 0.09MPa, 0.08MPa, 0.07MPa, 0.06MPa or 0.05 MPa.
Further, the dispersed air flow diffusion chamber is communicated with a first target point and a second target point, and the air pressure in the first target point is greater than the air pressure in the second target point; when the powder receiving mode of the powder fluidizing device is used, the dispersed airflow diffusion cavity is communicated with the first target point through the pressure relief filtering structure; when the powder fluidization mode of the powder fluidization device is used, the dispersed airflow diffusion cavity is communicated with the second target point through the pressure relief filtering structure.
Further, the target point is a powder receiving bin for receiving powder, and the powder receiving bin is provided with a pressure relief filtering device;
when the powder output mode of the powder fluidizing device is used, when the gas-solid two-phase flow reaches the powder receiving bin, part of gas is released through the pressure relief filtering device.
The utility model discloses a powder fluidization structure and powder fluidizer have still been adopted, powder fluidization structure for receive gas and make gas and powder mix and obtain the gas-solid two-phase flow, above-mentioned powder fluidization structure contains the powder and keeps apart ventilative layer, above-mentioned powder keeps apart ventilative layer and divide into air inlet airflow diffusion chamber and dispersion airflow diffusion chamber with powder fluidization structure, thereby above-mentioned gas keeps apart ventilative layer through the powder and forms the dispersion air current and acts on in dispersion airflow diffusion chamber and wait to carry the powder and form above-mentioned gas-solid two-phase flow behind the air inlet airflow diffusion chamber.
The powder enters the dispersing airflow diffusion cavity and is separated from the air inlet airflow diffusion cavity by the powder isolating and ventilating layer; compressed gas enters the gas inlet airflow diffusion cavity, is dispersed by the powder isolation and ventilation layer and then enters the gas inlet airflow diffusion cavity, and the dispersed airflow is mixed with the powder to form gas-solid two-phase flow.
Further, the powder isolation and ventilation layer comprises a porous ventilation film which blocks the powder on the surface.
Further, the porous breathable film is an expanded polytetrafluoroethylene film.
The powder fluidization structure further comprises a clamping and positioning structure for shaping the powder isolation and ventilation layer, wherein the clamping and positioning structure is provided with a first clamping part positioned on one side surface of the powder isolation and ventilation layer and a second clamping part positioned on the other side of the powder isolation and ventilation layer and connected with the first clamping part;
the first clamping part is tightly attached to one side face of the powder isolating and ventilating layer, and the first clamping part is tightly attached to the other side face of the powder isolating and ventilating layer.
Set up like this, when this powder isolation ventilative layer of installation, directly press from both sides first clamping part and second clamping part tightly, accomplish the installation location to the ventilative layer of powder isolation promptly, convenient, swift, easy dismouting.
The second clamping part can be a shell which is connected with an air inlet pipe of the powder fluidizing device and the inner cavity of which is an air inlet airflow diffusion cavity, and the first clamping part can be a shell of which the inner cavity is a dispersed airflow diffusion cavity.
Further, the edge of the powder isolation breathable layer is flanged, and the edge is clamped by the clamping and positioning structure.
Furthermore, the clamping and positioning structure is an opposite pore plate or an opposite support net for clamping the powder isolation and ventilation layer.
The powder fluidizing device has a powder fluidizing mode and a powder output mode, and includes:
the gas inlet structure is used for receiving gas and mixing the gas with the powder to obtain gas-solid two-phase flow;
the ash discharging structure is used for conveying the gas-solid two-phase flow to a target point;
the gas inlet structure is the powder fluidization structure.
Further, the powder fluidizing device comprises a device main body and a bottom cover, wherein the inner cavity of the device main body is a dispersed airflow diffusion cavity, the inner cavity of the bottom cover is an air inlet airflow diffusion cavity, the lower end of the device main body is provided with a bottom plate with a through hole or a pore, and the upper end of the bottom cover, which corresponds to the bottom plate, is provided with a top plate with a through hole or a pore; the top plate and the bottom plate are in flange connection, and the powder isolation breathable layer is clamped between the top plate and the bottom plate.
Furthermore, a pressure relief filter structure is arranged on the powder fluidizing device, and a purified gas outlet end of the pressure relief filter structure is provided with any one or any combination of a humidity detection device, a temperature detection device and a pressure detection device for detecting gas.
Further, the dispersed airflow diffusion chamber is provided with a heating device for immersing and contacting the powder.
Furthermore, a heating device for heating the gas entering the gas inlet flow diffusion cavity or a gas inlet pipe of the gas inlet flow diffusion cavity is arranged on the powder fluidizing device and is connected with a hot gas compressed gas source.
The utility model discloses a powder fluidizer's release filtration has still been adopted.
Powder fluidizer's release filtration includes:
the raw gas inlet end is used for being communicated with the powder fluidizing device;
the purified gas outlet end is connected with the purified gas conveying channel through an exhaust pipeline;
wherein, the clean gas outlet end is also connected with a back-blowing gas inlet pipe, a switch for controlling the opening and closing of the back-blowing gas inlet pipe is arranged on the back-blowing gas inlet pipe, and the switch is associated with the switch of the gas inlet pipe for inputting gas into the gas inlet airflow diffusion cavity of the powder fluidizing device.
When the powder enters the powder fluidizing device or after the powder enters the powder fluidizing device, the switch on the air inlet pipe is opened, the back-blowing air inlet pipe is opened at the same time or after a period of time, back-blowing is carried out, and the air flow enters the powder fluidizing device from the air inlet pipe and the back-blowing air inlet pipe.
The switch through setting up the blowback gas access pipe is correlated with the switch of the intake pipe of air inlet airflow diffusion chamber input gas, when aerifing air inlet airflow diffusion chamber like this, can carry out the blowback to release filtration simultaneously, still carries out the helping hand tonifying qi to air inlet airflow diffusion chamber simultaneously, and the efficiency of fluidization work has been improved greatly to many birds with one stone.
Further, the pressure relief filter structure comprises a filtering mode and a power-assisted gas transmission regeneration working mode;
in the filtering mode, the gas in the powder fluidizing device is discharged into the clean gas conveying channel through the exhaust pipeline after passing through the pressure relief filtering structure;
under the helping hand gas transmission regeneration mode, gaseous back-flushing to the filter core of release filtration on the blowback admission pipe that passes through, the blowback gas that carries out the back-flushing to the filter core simultaneously to the air inlet flow diffusion chamber input gas and with the powder backward flow on the filter core to the dispersion air flow diffusion chamber, gaseous and powder mixture become the gas-solid two-phase flow simultaneously.
Furthermore, the switch for controlling the opening and closing of the back-blowing gas inlet pipe and the gas inlet pipe for inputting gas to the gas inlet airflow diffusion cavity of the powder fluidizing device are connected with the same gas source device, so that the operation is convenient.
Further, the gas source device is a compressed gas bag.
Further, the associated switches are solenoid valves.
Further, the pressure relief filter structure further comprises a control module for controlling the solenoid valve.
Further, a diffusing pipe for diffusing is arranged at the clean air outlet end so as to be connected with the external atmosphere or other relatively low-pressure environment.
Furthermore, the diffusing pipe is provided with a pressure detection device for detecting the air pressure value of the diffusing cavity of the dispersed airflow of the powder fluidizing device and detecting at the diffusing end to avoid the interference of the powder.
Further, the clean air outlet end is provided with a throttle orifice.
Further, the raw gas inlet end is arranged at the lower end of the pressure relief filtering structure and is used for being communicated with the upper part of the powder fluidizing device; the clean air outlet end is arranged at the upper end of the pressure relief filtering structure.
Further, the exhaust duct includes a first exhaust pipe and a second exhaust pipe, one end of the first exhaust pipe is connected to the clean air outlet end, and the other end of the first exhaust pipe is connected to one end of the diffusing pipe; in the direction of pure gas exhaust, the middle section of the first exhaust pipe is sequentially provided with a gas inlet of a second exhaust pipe and a gas outlet of a back-blowing gas access pipe, and the first exhaust pipe is connected with a pure gas conveying channel through the second exhaust pipe.
The utility model discloses a powder conveying system and powder storage device, wherein, powder conveying system, include:
the powder receiving bin is used for receiving powder;
the pneumatic conveying channel is used for pneumatically conveying the powder to the powder receiving bin; and
and the pressure relief filtering device is arranged on the powder receiving bin and is used for releasing gas in the powder receiving bin.
Through the pressure difference between the powder receiving bin and the device at the other end of the pneumatic conveying channel, after gas-solid two-phase flow enters the powder receiving bin from the pneumatic conveying channel, gas is released out of the powder receiving bin from the pressure relief filtering device and is subjected to pressure relief, and the powder is blocked in the powder receiving bin by the pressure relief filtering device.
Through setting up aforementioned release filter equipment, after the powder is carried to the powder and is received the storehouse, the guarantee powder receives the atmospheric pressure in the storehouse and satisfies pneumatic conveying's condition, prevents simultaneously that the powder from letting out the powder and receives the storehouse to reach the purpose of release, environmental protection.
Furthermore, the filter element of the pressure relief filter device is arranged above the powder receiving bin.
Furthermore, the gas releasing end of the pressure relief filtering device is provided with a gas suction device which can be a fan or a vacuum pump.
Further, the powder receiving bin is connected with a powder fluidizing device through a pneumatic conveying channel, and a blowing-assisting and air-supplementing channel for supplementing air to the pneumatic conveying channel is connected to the pneumatic conveying channel.
Furthermore, the pneumatic transmission channel is a double-sleeve pneumatic transmission channel.
The powder storage device comprises a powder receiving bin and a pressure relief filtering device used for releasing gas in the powder receiving bin, wherein the powder receiving bin is communicated with the environment outside the powder receiving bin through the pressure relief filtering device.
Further, powder storage device includes that the inner chamber is the storage device main part in powder receiving storehouse, is provided with the superpressure relief valve in this storage device main part, is provided with the charge level indicator that is used for detecting high low limit material level in this storage device main part.
Further, powder storage device includes that the inner chamber receives the storage device main part in storehouse for the powder, and this storage device main part includes upper portion and lower part, all is provided with temperature-detecting device on above-mentioned upper portion and the lower part.
Further, a pressure detection device is arranged in the powder receiving bin or the pressure relief filtering device on the powder receiving bin. When the pressure detection device is disposed in the pressure-relief filter device, it is preferably disposed in both the clean air chamber and the raw air chamber of the pressure-relief filter device. The pressure in the clean gas cavity and the pressure in the raw gas cavity can be detected to know whether the powder receiving bin receives the powder, namely whether the powder is completely received or not, whether the powder is abnormal or not, for example, a specified pressure difference, and when the pressure difference is in a specified value, the conditions that the powder is completely received or the powder is abnormal or not, whether the powder is blocked or not can be known.
The lower extreme in storehouse is received to the powder is provided with the valve that is used for discharging the powder, and what this valve below corresponds is provided with the humidification device that is used for improving powder humidity.
The utility model discloses a powder fluidizer's release filtration, powder fluidizer's release filtration are used for setting up on powder fluidizer, and the optional intercommunication of clean gas end of above-mentioned release filtration has first release pipeline and second release pipeline, and above-mentioned first release pipeline has pressure differential with second release pipeline.
When the powder enters the powder fluidizing device or is in a powder receiving mode, the clean gas end of the pressure-relief filtering structure is communicated with the first pressure-relief pipeline, so that the powder can smoothly fall down.
Through setting up this release filtration, the convenience makes different net gas end butt joint modes to powder fluidizer in the atmospheric pressure demand of difference, and the release in powder receiving, the powder output process in the convenient realization powder fluidizer like this realizes the interception to the powder in the release process of powder fluidizer simultaneously.
Further, the first pressure relief pipeline is communicated with a gas conveying pipeline or a gas container, and the output end of the second pressure relief pipeline is a releasing end. The diffusing end can be provided with a pressure detection device to detect the air pressure in a diffusing cavity of the dispersed air flow of the powder fluidizing device.
Further, a valve for controlling the opening and closing of the first pressure relief pipeline is associated with a valve for discharging materials on the powder fluidizing device.
Furthermore, a valve for controlling the opening and closing of the second pressure relief pipeline is associated with the opening and closing of the discharge pipe on the powder fluidizing device.
Further, the air purifying end is connected with a back blowing inlet pipe.
Furthermore, a valve for controlling the opening and closing of the back-blowing gas inlet pipe is associated with a switch for opening and closing the gas inlet pipe on the powder fluidizing device.
Furthermore, the back-blowing gas access pipe and a gas inlet pipe for inputting gas into a gas inlet airflow diffusion cavity of the powder fluidizing device are connected with the same gas source device, so that the control is convenient.
Furthermore, the pressure relief filter structure is provided with an observation hole positioned at the lower part of the pressure relief filter structure, and the observation hole is provided with a flange cover used for plugging the observation hole.
Further, the pressure relief filter structure further includes an end cap at an upper end of the pressure relief filter structure.
Further, the end cap is a blind flange.
The utility model also provides a particle screening method and a powder fluidization device;
a particulate matter screening method, comprising:
receiving powder to be conveyed by using a powder receiving mode of a powder fluidizing device;
the powder fluidization mode of the powder fluidization device is used for mixing gas with the powder to be conveyed through the gas inlet structure to form gas-solid two-phase flow;
the powder output mode of the powder fluidizing device is used for conveying the gas-solid two-phase flow to a target point through the discharge pipe;
before or in the powder fluidization mode, a specified air pressure value or an air pressure value interval is set in a cavity where the mixed gas-solid two-phase flow is located, the air pressure is kept stable in the specified air pressure value or the air pressure value interval in the powder fluidization mode, the air pressure is kept in the specified air pressure value or the air pressure value interval in the powder output mode, and the corresponding gas-solid two-phase flow under the specified air pressure value or the air pressure value interval is extracted.
Under different air pressures, the suspension states of the powder with different weights are different, namely, the environment where the powder is located is layered by controlling the air pressure in the environment where the powder is located, part of the powder is suspended under the air pressure, part of the powder is precipitated under the air pressure, and the required powder is extracted after being conveyed pneumatically.
Further, the powder fluidizing device is provided with an air exhaust pipeline, and the operation of keeping the air pressure stable within the specified air pressure value or the specified air pressure value interval comprises the step of keeping the air pressure stable within the specified air pressure value or the specified air pressure value interval by controlling the air input of the air inlet structure and the air output of the air exhaust pipeline.
Further, the powder fluidizing device comprises a powder isolation and ventilation layer for gas to pass through, the powder isolation and ventilation layer divides a gas inlet structure into a gas inlet airflow diffusion chamber and a dispersed airflow diffusion chamber, and the gas passes through the gas inlet airflow diffusion chamber and then forms dispersed airflow through the powder isolation and ventilation layer to act on particles to be conveyed in the dispersed airflow diffusion chamber so as to form the gas-solid two-phase flow.
Further, in the powder output mode, the particles in the powder fluidizing device are extracted in a grading mode according to the height of the particles.
Powder fluidizer, including powder fluidization mode and powder output mode, this fluidizer includes:
the powder isolating and ventilating layer is used for isolating the particles in a powder fluidization mode and simultaneously allowing gas to pass and be mixed with the particles;
the dispersed airflow diffusion cavity is positioned on one side surface of the powder isolating and ventilating layer, and the other side surface of the powder isolating and ventilating layer corresponds to the air inlet airflow diffusion cavity;
and the extraction channel is used for extracting the particles in the dispersed airflow diffusion cavity in the powder output mode.
Furthermore, the powder isolating and ventilating layer comprises a porous ventilating film which blocks the particles on the surface of the powder isolating and ventilating layer.
Furthermore, the powder fluidizing device also comprises a powder receiving bin, wherein the powder receiving bin is provided with a gas suction device for pumping gas in the powder receiving bin, and the gas suction device is controlled to enable the powder receiving bin and the dispersed airflow diffusion cavity to realize differential pressure drainage.
Furthermore, at least two extraction channels arranged along the gravity direction are arranged on the dispersed airflow diffusion cavity, so that powder with different suspension heights can be conveniently extracted.
Furthermore, the outlet end of the conveying channel is connected with a powder receiving bin, and the powder receiving bin is provided with a pressure relief filtering device for releasing gas in the powder receiving bin and preventing powder from leaking out.
Further, a vacuum pump for vacuumizing the powder receiving bin is arranged at the gas release end of the pressure relief filtering device.
Further, a pressure detection device is arranged on the extraction channel; alternatively, a pressure detection device is arranged in the dispersed airflow diffusion cavity.
Furthermore, the powder fluidizing device also comprises a pressure control module which is used for keeping the pressure of the dispersed airflow diffusion cavity at a specified air pressure, and the pressure control module is respectively in communication connection with the air inlet structure of the powder fluidizing device and the pressure relief structure of the powder fluidizing device.
The utility model also provides a powder drying device, including drying mode and transport mode, above-mentioned powder drying device includes:
the gas inlet structure is used for receiving gas and mixing the gas with the powder to obtain gas-solid two-phase flow;
the discharge structure is used for discharging the water in the gas-solid two-phase flow out of the powder drying device;
and the detection component is used for detecting the humidity of the gas-solid two-phase flow in the drying process.
Through setting up this powder drying device, dry the powder through the mode that makes gas and powder mix formation gas-solid two-phase flow, compare in adopting the mode of directly heating the powder, formed gas-solid two-phase flow, convenient direct pneumatic transport to the powder.
Further, the discharge structure comprises a diffusion pipe communicated with a dispersed airflow diffusion cavity for accommodating the gas-solid two-phase flow. The dispersing end can be provided with a pressure detection device for detecting the air pressure in the cavity containing the gas-solid two-phase flow.
Further, the detection assembly includes a humidity detection device disposed at an outlet end of the exhaust structure.
Further, the exhaust structure comprises an exhaust duct, and the detection assembly comprises a humidity detection device arranged on the exhaust duct.
Further, the powder drying device also comprises a heating device for heating and conveying the gas to the gas inlet structure; alternatively, the air inlet structure comprises an air inlet pipe for connecting a hot air source.
Further, the powder drying device also comprises a cavity for containing gas-solid two-phase flow, and a heating device which is used for being immersed into and contacted with the powder is arranged in the cavity.
Further, the powder drying device also comprises a conveying device for conveying powder, and the detection assembly is in communication connection with a control module for controlling the opening and closing of the conveying device.
The gas flows through the gas inlet airflow diffusion cavity, then forms a dispersed airflow through the powder isolation and ventilation layer, and acts on the powder to be conveyed in the dispersed airflow diffusion cavity to form the gas-solid two-phase flow.
Further, the powder isolation and ventilation layer comprises a porous ventilation film which blocks the powder on the surface.
Further, the powder drying device further comprises a clamping and positioning structure for shaping the powder isolation breathable layer, and the clamping and positioning structure is a heating device.
Furthermore, the porous breathable film has a separation rate of more than 99% for dust with a particle size of more than or equal to 0.1m in the gas to be treated.
Further, the porous air-permeable film has a pore density of 5X 108 pores/cm2About 30X 108 pieces/cm2。
The present invention will be further described with reference to the accompanying drawings and the detailed description. Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description. Or may be learned by practice of the invention.
Drawings
The accompanying drawings, which form a part of the disclosure, are included to assist in understanding the disclosure, and the description provided herein and the accompanying drawings, which are related thereto, are intended to explain the disclosure, but do not constitute an undue limitation on the disclosure.
In the drawings:
FIG. 1 is a schematic view of a powder fluidizing apparatus for explaining the present embodiment;
FIG. 2 is a schematic diagram illustrating a bin pump, a dual-casing pneumatic conveying channel and a blowing-assisting and air-supplementing channel in the powder fluidizing apparatus according to the present embodiment;
fig. 3 is a schematic diagram for explaining a powder fluidization structure of the present embodiment;
FIG. 4 is an enlarged view of a portion of FIG. 3 at A;
FIG. 5 is a partial schematic view for explaining a hopper pump in the powder fluidizing apparatus according to the present embodiment;
fig. 6 is a schematic diagram for explaining a bottom plate in the powder fluidizing apparatus according to the present embodiment;
fig. 7 is a schematic view for explaining a powder-insulating gas-permeable layer in the powder fluidizing apparatus according to the present embodiment;
fig. 8 is a schematic view for explaining a bottom cover in the powder fluidizing apparatus according to the present embodiment;
fig. 9 is a schematic diagram for explaining a top plate in the powder fluidizing apparatus according to the present embodiment;
fig. 10 is a schematic diagram for explaining the powder transport system of the present embodiment;
FIG. 11 is a schematic diagram illustrating the connection between an outlet pipe and a dual-casing pneumatic conveying channel in a multi-group ash conveying and discharging device according to the embodiment;
FIG. 12 is a schematic view showing the connection of a powder fluidizing apparatus according to the present embodiment using the present method for sieving particulate matter;
fig. 13 is a schematic view for explaining a powder receiving bin in the present embodiment;
the labels in the figure are: 1-bin pump, 101-bottom plate, 102-upper annular boss, 2-bottom cover, 200-air inlet flow diffusion cavity, 201-top plate, 202-lower annular boss, 3-powder isolation breathable layer, 301-edge of turned-over edge of powder isolation breathable layer, 302-porous breathable film, 303-support of powder isolation breathable layer, 4-upper gasket, 5-lower gasket, 6-exhaust pipeline, 601-first exhaust pipe, 602-second exhaust pipe, 7-clean gas side channel, 8-bin pump pressure relief filtering structure, 801-raw gas inlet end, 802-clean gas outlet end, 9-compressed gas bag, 10-back blowing gas access pipe, 11-blow-off pipe, 12-double-sleeve pneumatic conveying channel, 12 a-conveying section, 12 b-connecting section, 1201-inner bypass pipe, 13-blowing-assisting air-supplementing channel, 13 a-air-supplementing input pipe, 14-air inlet pipe, 15-discharge pipe, 15 a-straight section, 15 b-arc section, 16-powder receiving bin, 17-pressure-relief filtering device, 18-fan, 19-extraction channel, 20-humidity detection device and 21-vacuum pump.
Detailed Description
The present invention will be described more fully with reference to the accompanying drawings. Those of ordinary skill in the art will be able to implement the invention based on these descriptions. Before the present invention is described with reference to the accompanying drawings, it is to be noted that:
the technical solutions and features provided in the present invention in each part including the following description may be combined with each other without conflict.
Moreover, the embodiments of the invention described in the following description are generally only examples of a subset of the invention, and not all examples. Therefore, all other embodiments obtained by a person of ordinary skill in the art without creative efforts based on the embodiments of the present invention shall fall within the protection scope of the present invention.
With respect to the terms and units of the present invention. The term "comprises" and any variations thereof in the description and claims of this invention and the related art are intended to cover non-exclusive inclusions. The following places can be provided with a pressure detection device, a humidity detection device, a temperature detection device or a heating device, the mentioned devices can be common devices, the installation of the devices and the acquisition of signals can be realized by a conventional mode, and part of the devices are not shown in the figure and are marked.
As shown in fig. 1-13, the utility model provides a conveying method of powder, including:
receiving powder to be conveyed by using a powder receiving mode of a powder fluidizing device;
the powder fluidization mode of the powder fluidization device is used for mixing gas with the powder to be conveyed through the gas inlet structure to form gas-solid two-phase flow;
the powder output mode of the powder fluidizing device is used to enable the gas-solid two-phase flow to be conveyed to the powder receiving bin 16 through the discharge pipe;
the gas entering the gas inlet structure passes through the gas inlet airflow diffusion cavity 200, is dispersed into dispersed airflow through the powder isolation and ventilation layer 3, and acts on powder to be conveyed in the dispersed airflow diffusion cavity 100 to form the gas-solid two-phase flow.
Thus, the airflow passes through the powder isolation breathable layer 3 for isolating the powder and disperses the airflow, so that the dispersed airflow is mixed with the powder to form a gas-solid two-phase flow, and by adopting the method for isolating the powder, the airflow firstly enters the air inlet airflow diffusion cavity 200 for diffusion and then is dispersed through the powder isolation breathable layer 3, so that the gas-solid two-phase flow which can uniformly fluidize the powder under the low-speed condition without wearing a pipeline can be ensured for low-energy-consumption and long-distance gas-flow conveying.
The powder barrier gas-permeable layer 3 comprises a porous gas-permeable membrane 302 capable of blocking at least a major part of the powder in the powder fluidization device on one side surface thereof. Compared with other air-permeable materials, the porous air-permeable film 302 is arranged, so that powder is blocked on the surface of the porous air-permeable film 302, and the powder is prevented from being deposited in the air-permeable material; when using the fluidization part of traditional ventilative material, after using for a long time, the powder deposit is in fluidization part, seriously influences fluidization efficiency, adopts general clearance mode also comparatively troublesome and effect not good, adopts the utility model discloses a ventilative layer 3 is kept apart to the powder that is provided with porous ventilative film 302, will most at least powder block on its one side surface, has avoided the powder to get into powder and has kept apart ventilative layer 3 inside, directly keeps apart the powder on the surface, has avoided the cleaning work complicated to ventilative material, makes this powder keep apart ventilative layer 3 have fairly high life.
The porous air-permeable film 302 has a barrier rate of 99% or more against powder having a particle size of 0.1m or more among the above-mentioned powders. The powder-barrier air-permeable layer 3 includes a support 303 provided on the other surface of the porous air-permeable film 302, the porous air-permeable film 302 is attached to the support 303, and the support 303 may be made of an air-permeable fabric.
The air inlet structure comprises a clamping and positioning structure arranged outside the powder isolating and ventilating layer 3, the clamping and positioning structure is provided with a first clamping part located on one side surface of the powder isolating and ventilating layer 3 and a second clamping part located on the other side of the powder isolating and ventilating layer 3 and connected with the first clamping part, and opposite holes are formed in the first clamping part and the second clamping part.
The output pressure of the gas-solid two-phase flow is not more than 0.25MPa, 0.24MPa, 0.23MPa, 0.22MPa, 0.21MPa, 0.2MPa, 0.19MPa, 0.18 MPa, 0.17MPa, 0.16MPa, 0.15MPa, 0.14MPa, 0.13MPa, 0.12MPa, 0.11MPa, 0.1MPa, 0.09MPa, 0.08MPa, 0.07MPa, 0.06MPa or 0.05 MPa.
The dispersed air flow diffusion chamber 100 is communicated with a first target point and a second target point, wherein the air pressure in the first target point is greater than the air pressure in the second target point; when the powder receiving mode of the powder fluidizing device is used, the dispersed airflow diffusion cavity 100 is communicated with a first target point through a pressure relief filtering structure; when the powder fluidization mode of the powder fluidization device is used, the dispersed gas flow diffusion chamber 100 is communicated with the second target point through the pressure-relief filter structure.
The powder receiving bin 16 is provided with a pressure relief filtering device 17; when the powder output mode of the powder fluidizing device is used, when the gas-solid two-phase flow reaches the powder receiving bin 16, part of gas is released through the pressure relief filtering device 17.
The method will be described below by taking an ash conveying and discharging device of a blast furnace gas dust removing apparatus as an example.
Referring to fig. 1 to 11, the ash conveying and discharging device for a blast furnace gas dust removing device is provided with a corresponding operating switch, a control valve, a detection instrument, an ash blowing device for ash discharge, a vibrator and the like, and the distribution comprises the following operating steps:
s1, opening a discharge valve of the blast furnace gas dust removal device, discharging the powder of the blast furnace gas dust removal device into a bin pump, and filling compressed gas serving as fluidization kinetic energy gas into the bin pump to rapidly and fully fluidize the powder in the bin pump so as to obtain uniformly fluidized gas-solid two-phase substances;
s2, discharging the gas-solid two-phase substances from the bin pump to the powder receiving bin 16; wherein, the output pressure reached by the gas-solid two-phase flow is less than or equal to 0.15MPa, and the residual dust amount in the dust fluidizing device at the end of the dust output mode is less than or equal to 20 percent of the dust amount to be conveyed received in the dust fluidizing device at the end of the dust receiving mode.
The internal pressure of the bin pump can be selected from 40-110kpa, the ash discharge time is 90-120s, and the fluidizing time can be 10-15 s.
Complete rapid, uniform and sufficient fluidization at a high ash-gas ratio, and discharge at a low pressure of 0.1-0.15 MPa. Therefore, the method is applied to the ash conveying and discharging equipment of the blast furnace gas dust removal device, and the service life of the conveying channel for conveying the powder is greatly prolonged. The control of the output pressure and the output ash quantity of the gas-solid two-phase object can ensure that the powder with higher ash gas ratio can be uniformly fluidized under the low-speed condition without wearing a pipeline to carry out low-energy-consumption pneumatic remote conveying on the gas-solid two-phase object.
The method can be realized by depending on a powder fluidization structure which is used for receiving gas and mixing the gas and the powder to obtain gas-solid two-phase flow, the powder fluidization structure comprises a powder isolation and ventilation layer 3, the powder isolation and ventilation layer 3 divides the powder fluidization structure into a gas inlet airflow diffusion cavity 200 and a dispersed airflow diffusion cavity 100, and the gas passes through the gas inlet airflow diffusion cavity 200 and then forms dispersed airflow through the powder isolation and ventilation layer 3 to act on the powder to be conveyed in the dispersed airflow diffusion cavity 100 so as to form the gas-solid two-phase flow.
The powder-barrier air-permeable layer 3 includes a porous air-permeable film 302 for blocking the powder on the surface thereof.
The powder fluidization structure also comprises a clamping and positioning structure for shaping the powder isolation and ventilation layer 3, wherein the clamping and positioning structure is provided with a first clamping part positioned on one side surface of the powder isolation and ventilation layer 3 and a second clamping part positioned on the other side of the powder isolation and ventilation layer 3 and connected with the first clamping part; the first clamping part is tightly attached to one side surface of the powder isolating and ventilating layer 3, and the first clamping part is tightly attached to the other side surface of the powder isolating and ventilating layer 3.
Set up like this, when this powder isolation ventilative layer 3 of installation, directly press from both sides first clamping part and second clamping part tightly, accomplish the installation location to the ventilative layer 3 of powder isolation promptly, convenient, swift, easy dismouting.
Here, the second holding portion may be a part in the housing of the inlet gas flow diffusion chamber 200 connected to the powder fluidizing device inlet pipe 14, and the first holding portion may be a part in the housing of the dispersion gas flow diffusion chamber 100.
The edge 301 of the powder isolation and ventilation layer 3 is flanged, and the edge 301 is clamped by the clamping and positioning structure. The edge 301 flanging mode is adopted not only to form an effective support for the powder isolation breathable layer 3, but also to clamp the flanging by the first clamping part and the second clamping part, so that the edge 301 forms a sealing structure.
The clamping and positioning structure is a hole plate which is opposite to the powder isolating and ventilating layer 3 and can also be a supporting net.
The powder fluidizing device has a powder fluidizing mode and a powder output mode, and includes:
the gas inlet structure is used for receiving gas and mixing the gas with the powder to obtain gas-solid two-phase flow;
the ash discharging structure is used for conveying the gas-solid two-phase flow to a target point;
the gas inlet structure is the powder fluidization structure.
Through adopting foretell powder fluidization structure, let this powder fluidizer realize the part easy dismouting of fluidization function.
The powder fluidizing device comprises a device main body with an inner cavity of a dispersed airflow diffusion cavity 100 and a bottom cover 2 with an inner cavity of an air inlet airflow diffusion cavity 200, wherein the lower end of the device main body is provided with a bottom plate 101 with a through hole or a pore, and the upper end of the bottom cover 2 corresponding to a bottom plate is provided with a top plate 201 with a through hole or a pore; the top plate 201 and the bottom plate 101 are flange-connected to each other, and the powder isolation and gas permeation layer 3 is sandwiched between the top plate 201 and the bottom plate 101. Before the fluidization operation is carried out or in the fluidization process, the powder is preferably dried, so that the powder is not interfered by moisture, and the drying treatment of the powder to be fluidized can be realized by arranging a heat-insulating layer heat tracing and a steam pipeline heat tracing on the device main body (the heat-insulating layer heat tracing can also be arranged on the conveying channel) and by heating gas or heating the powder at the source.
The structure is formed, the dispersion airflow diffusion cavity 100 and the air inlet airflow diffusion cavity 200 are two cavities which can be separated from each other, so that convenience can be provided for maintenance and repair, the installation of the powder isolation breathable layer 3 can be conveniently completed, and the effective connection of the dispersion airflow diffusion cavity 100 and the air inlet airflow diffusion cavity 200 is completed.
The bottom cover 2 may be divided into two parts, the lower part is a cover-shaped structure, the upper part is a top plate 201, a hollow structure communicating with the outside through the top plate 201 and the air inlet pipe 14 is formed, and the air outlet of the air inlet pipe 14 is located on the cover-shaped structure. The through hole in the bottom plate 101 of the apparatus main body preferably vertically corresponds to the through hole in the top plate 201. Of course, the top plate 201 and the bottom plate 101 may be replaced by a support net, as long as it is ensured that the airflow entering from the air inlet pipe 14 can enter the dispersed airflow diffusion chamber 100 after passing through the powder isolation breathable layer 3 from the air inlet airflow diffusion chamber 200.
The powder fluidizing device is provided with a pressure relief filter structure, and the clean air outlet end 802 of the pressure relief filter structure is provided with any one or combination of any multiple of a humidity detection device, a temperature detection device and a pressure detection device for detecting air. Set up one arbitrary or arbitrary multiple combination in humidity detection device, temperature-detecting device, the pressure measurement device through net gas exit end 802 at release filtration like this to effectual gas to after filtering detects, improves the degree of accuracy that detects, avoids detecting the gas of doping the powder, makes the testing result inaccurate.
The powder fluidizing device is provided with a heating device for heating the gas entering the gas inlet flow diffusion cavity 200 or the gas inlet pipe 14 of the gas inlet flow diffusion cavity 200 is connected with a hot gas compressed gas source. In this way, the efficiency of drying the powder is improved.
The powder fluidizing device is applied to ash conveying and discharging equipment of a blast furnace gas dust removing device and comprises a bin pump 1 (the inner cavity of which is a dispersed airflow diffusion cavity 100 and can also be called as a device main body), a bottom cover 2 (the inner cavity of which is an air inlet airflow diffusion cavity 200) and a powder isolating and ventilating layer 3.
The upper end of the bin pump 1 is used for being connected with a discharge opening of a blast furnace gas dust removal device provided with an ash discharge valve group; the outlet at the lower end of the bin pump 1 is provided with a bottom plate 101 for sealing the bottom; the bin pump 1 can be supported by a support frame and support legs, and the lower part of the bin pump 1 is of a funnel structure;
a bottom cover 2 provided with an air inlet for inputting fluidization kinetic energy air, wherein the bottom cover 2 is arranged at the lower end of the bin pump 1, and the upper end of the bottom cover 2 is provided with a top plate 201 for capping and is used for corresponding to the bottom plate 101;
the aperture of the top plate 201 and the bottom plate 101 is determined according to the amount and the particle size of the powder, and the main function is to promote the powder to be fully fluidized; the bottom cover 2 is communicated with the bottom of the bin pump, and the fluidization kinetic energy gas enters from one side of the bottom cover 2; the powder isolating and ventilating layer 3 is arranged between the bottom of the bin pump 1 and the bottom cover 2. The bottom cover 2 here functions not only as a seal for the lower end of the silo pump but also as a support jig for the powder isolation and ventilation layer 3.
And the powder isolating and ventilating layer 3 corresponds to the bottom plate 101 or the top plate 201, and the powder isolating and ventilating layer 3 is fixedly clamped between the bin pump 1 and the bottom cover 2 and tightly pressed, so that the fluidizing kinetic energy gas passing through the top plate 201, the powder isolating and ventilating layer 3 and the bottom plate 101 fluidizes the powder in the bin pump to obtain a gas-solid two-phase substance. The bottom plate 101 and the top plate 201 are connected by flanges. In the figure, for convenience of illustration, gaps are drawn between the powder isolation and ventilation layer 3 and the bottom plate 101 and the top plate 201, and in an actual arrangement, no gap is formed between the bottom plate 101 and the top plate 201 and the powder isolation and ventilation layer 3 in a compressed state.
The powder isolating and ventilating layer 3 is of a disc-shaped structure made of elastic materials. By adopting the microcosmic huge amount of even fluidization airflow, the gas entering the bin pump can fully and evenly fluidize the powder in the bin pump 1 without dead angles in a short time. Namely, after the powder is input into the bin pump 1, the powder falls on the powder isolating and ventilating layer 3, the filled compressed gas enters the bin pump 1 from the lower part, and the compressed gas passes through the powder isolating and ventilating layer 3 so as to fully fluidize the powder above.
The expanded polytetrafluoroethylene is a medical high polymer material, is used for manufacturing medical products such as artificial blood vessels, heart patches and the like, and is an ideal biological tissue substitute at present. Expanded polytetrafluoroethylene is commonly used in industry as filter cassettes, microfiltration membranes, filter pores, gaskets. Through the research, keep apart ventilative layer 3 with the powder and prop up as the core part in the fluidizer, one side will fall into the powder in the storehouse pump, and the fluidization kinetic energy gas that gets into the storehouse pump is received to the opposite side, lets this gas pass through this powder keeps apart ventilative layer 3, cuts apart evenly a large amount of gases, can just can carry out quick even fluidization to the powder that ventilative layer 3 of powder kept apart supported with less compressed gas in the short time like this.
After the bin pump receives the powder, a certain amount of fluidization kinetic energy gas is rapidly filled into the bin pump (the filling speed and the fluidization time are adjusted according to factors such as the size of the bin pump and the amount of the powder) to generate the gas-solid two-phase object, and when the gas-solid two-phase object is conveyed, the pressure is lower than the traditional conveying pressure and the speed is low, so that the abrasion of a conveying pipeline is greatly reduced; the important characteristics of the low pressure and the low speed are that the output pressure of the gas-solid two-phase flow is less than or equal to 0.15MPa, and the residual dust amount in the dust fluidizing device at the end of the dust output mode is less than or equal to 20% of the dust amount to be conveyed received in the dust fluidizing device at the end of the dust receiving mode.
By controlling the output pressure and the output ash amount of the gas-solid two-phase substance, the low-energy-consumption long-distance gas-power conveying of the gas-solid two-phase substance which can uniformly fluidize the powder with higher ash gas ratio under the low-speed condition without wearing a pipeline can be ensured. The single through holes of the bottom plate 101 and the top plate 201 correspond to each other up and down to form an air flow channel with a powder isolating and ventilating layer 3 in the middle. Therefore, a reliable airflow channel is formed on the fluidizing device, the fluidizing work is smoothly carried out, and the fluidizing kinetic energy gas can smoothly pass through the powder isolation breathable layer 3.
The powder isolation breathable layer 3 is respectively connected with the bin pump 1 and the bottom cover 2 through flanges, and bolts adopted on the flanges can also be used as adjusting devices for adjusting the pressure of the bottom plate 101 and the top plate 201 on the powder isolation breathable layer 3.
The edge 301 of the powder isolation and ventilation layer 3 is flanged, and the flanged edge 301 is tightly pressed between the bottom plate 101 and the top plate 201. Through keeping apart ventilative layer 3 border 301 turn-ups with the powder, not only can keep apart ventilative layer 3 to the powder and provide effective support like this, can also let turn-ups border 301 use as sealed the pad, guarantee sealing performance.
In addition to the present embodiment, when the powder isolation air-permeable layer 3 is provided, a gasket may be provided, that is, an upper gasket 4 clamped between the powder isolation air-permeable layer 3 and the bin pump 1 is provided on the upper side of the powder isolation air-permeable layer 3, and a lower gasket 5 clamped between the powder isolation air-permeable layer 3 and the bottom cover 2 is provided on the lower side thereof, in order to further enhance the sealing performance on the premise that the edge 301 of the powder isolation air-permeable layer 3 is used for compression sealing. The lower end of the bottom plate 101 is provided with an upper annular boss 102 which extends downwards and is used for compressing an upper gasket, and the upper end of the top plate 201 is provided with a lower annular boss 202 which extends upwards and is used for compressing a lower gasket 5, so that when the bottom plate 101 and the top plate 201 are installed on the powder isolation breathable layer 3, the compression on the powder isolation breathable layer 3 can be sufficient, and high safety is kept.
The step S1 also comprises the operation of adjusting the internal pressure of the bin pump so as to discharge the blast furnace gas dust removal device: the pressure equalizing valve on the exhaust pipeline 6 connected between the clean gas side channel 7 of the blast furnace gas dust removing device and the inner cavity of the bin pump is opened, so that the gas in the bin pump passes through the bin pump pressure relief filtering structure 8 arranged on the exhaust pipeline 6 and the pressure equalizing valve in sequence and then is discharged into the clean gas side channel 7 of the blast furnace gas dust removing device through the exhaust pipeline 6, and the pressure balance between the clean gas side channel 7 of the blast furnace gas dust removing device and the inner cavity of the bin pump is realized.
The pressure balance between the clean gas side channel 7 and the inner cavity of the bin pump 1 is realized. Because the pressure in the clean gas side channel 7 is necessarily smaller than the pressure in the discharge valve of the dust removal device, a pressure difference is formed between the inner cavity of the bin pump and the discharge valve of the dust removal device, and powder is promoted to fall into the inner cavity of the bin pump 1 from the discharge valve. Because be equipped with storehouse pump release filtration 8 before the equalizer valve, consequently the dust content is less in the gas through the equalizer valve, has guaranteed the longer life of equalizer valve.
The step S1 also comprises the operation of unloading from the blast furnace gas dust removal device: opening a pressure equalizing valve of a bin pump, opening a feed valve of the bin pump when the pressure difference between the inner cavity of the blast furnace gas dust removal device and the inner cavity of the bin pump is less than or equal to 10kPa, then opening an ash discharge valve group of the blast furnace gas dust removal device, then starting a vibrator of the ash blast furnace gas dust removal device, and then blowing ash to an ash hopper;
when an ash bucket dust level indicator of the blast furnace gas dust removal device displays a low limit or an ash discharge timer reaches a preset value or the pressure difference between the inner cavity of the blast furnace gas dust removal device and the inner cavity of the bin pump is more than or equal to 30kPa or the bin pump displays a high material level, sequentially: stopping soot blowing work, stopping a vibrator, closing a soot discharge valve group of a blast furnace gas dust removal device, closing a bin pump feeding valve and closing a pressure equalizing valve of a bin pump. The operation steps realize reliable isolation and ash discharge between ash storage containers with different pressures.
The specific operation process can be performed according to the following procedures (powder receiving mode):
1) the ash discharge time timer (variable) starts to time;
2) opening a pressure equalizing valve of a bin pump for 8 minutes (variable);
3) detecting the pressure difference between the blast furnace gas dust removal device and the bin pump within less than or equal to 10kPa (variable);
4) opening a bin pump feeding valve of the blast furnace gas dust removal device;
5) opening a gas sealing valve of an ash discharge valve group of the blast furnace gas dust removal device;
6) opening a dust cutting valve of a dust discharging valve set of the blast furnace gas dust removing device after the blast furnace gas dust removing device is opened in place;
7) after the blast furnace gas dust removal device is opened in place, the rotary valve of the ash discharge valve group of the blast furnace gas dust removal device is opened;
8) after the blast furnace gas dust removal device is started in place, starting an ash bucket vibrator of the blast furnace gas dust removal device for 10 seconds (variable), and alternately performing the steps at intervals of 10 seconds (variable);
9) opening an ash bucket ash blowing valve, blowing for 10 seconds (variable) and stopping for 20 seconds (variable) after the ash bucket ash blowing valve is opened to the position;
10) when the dust level indicator of the dust hopper of the blast furnace gas dust removal device displays the time of a low limit or an ash discharge timer (20 minutes (variable)), or the pressure difference between the pressure of the blast furnace gas dust removal device and the pressure of the bin pump is more than or equal to 30kPa (variable), or the bin pump of the blast furnace gas dust removal device displays the blast material level, the next operation is carried out;
11) stopping the blowing valve of the ash bucket of the blast furnace gas dust removing device;
12) a vibration stopper;
13) stopping the rotary valve of the ash discharge valve group of the blast furnace gas dust removal device for 10 seconds, and then closing the dust removal valve of the ash discharge valve group of the blast furnace gas dust removal device;
14) closing the ash discharge valve group for 10S in place and closing the gas sealing valve;
15) closing the bin pump feeding valve of the blast furnace gas dust removal device in place for 10S;
16) and after the pressure equalizing valve is closed in place, closing the pressure equalizing valve of the blast furnace gas dust removal device.
The ash conveying operation process of the bin pump can be carried out according to the following procedures (powder output mode): (the high material limit of the bin pump is detected at the same time when the bin pump is put into operation and the dust removing device of the blast furnace gas corresponding to the bin pump is not in the ash discharging state);
1) a switch button for operating the bin pump to convey ash;
2) detecting that the bin pump 1 is in a delivery state and the bin pump corresponding to the blast furnace gas dust removal device is not in an ash unloading state, the bin pump 1 is not in an ash conveying state, the powder receiving bin 16 is at a delivery position, and the powder receiving bin 16 has no high and low material positions;
3) and (3) carrying out automatic ash conveying of a bin pump: a fluidizing valve on the bin opening pump air inlet pipe 14 (which is automatically closed after the bin opening pump is not in place for 5 seconds);
4) a bin opening pump for pressure relief of the filter structure pressurization valve (the fluidization valve is automatically closed after the bin opening pump is opened for 5 seconds);
5) detecting that the pressure value of the bin pump is more than or equal to 110kPa (variable);
6) a second discharge valve on the discharge pipe 15 of the open bin pump (the fluidization valve and the pressurization valve are automatically closed after the second discharge valve is opened for 9 seconds);
7) a first discharge valve on a discharge pipe 15 of the open bin pump (the fluidization valve and the pressurization valve are automatically closed after the opening is not in place for 9 seconds);
8) opening the blow-assisting valve in a delayed way for 5 seconds;
9) after the pressure value of the bin pump is detected to be less than or equal to 40kPa (variable), the fluidization valve is closed;
10) closing the bin pump to release pressure, closing the first discharge valve and the second discharge valve for 20 sec;
11) the blow valve is closed.
This powder fluidizer is provided with the release filtration, include:
a raw gas inlet port 801 for communicating with a powder fluidizing device;
a clean gas outlet end 802 connected with the clean gas conveying channel through the exhaust pipeline 6;
wherein, the clean gas outlet 802 is further connected to a back-blowing gas inlet pipe 10, the back-blowing gas inlet pipe 10 is provided with a switch for controlling the opening and closing thereof, and the switch is associated with the switch of the gas inlet pipe 14 for inputting gas to the gas inlet flow diffusion chamber 200 of the powder fluidization device.
The switch of the back-blowing gas access pipe 10 is associated with the switch of the gas inlet pipe 14 for inputting gas into the gas inlet airflow diffusion cavity 200, so that when the gas inlet airflow diffusion cavity 200 is inflated, back blowing can be simultaneously carried out on a pressure relief filtering structure, and meanwhile, the gas inlet airflow diffusion cavity 200 is assisted and supplemented with gas, thereby achieving multiple purposes and greatly improving the efficiency of fluidization work.
The pressure relief filtering structure comprises a filtering mode and a power-assisted gas transmission regeneration working mode;
in the filtering mode, the gas in the powder fluidizing device is discharged into the clean gas conveying channel through the exhaust pipeline 6 after passing through the pressure relief filtering structure;
in the power-assisted gas transmission regeneration working mode, gas is blown back to the filter element of the pressure relief filter structure through the back blowing gas inlet pipe 10, back blowing gas for blowing back to the filter element simultaneously inputs gas to the gas inlet airflow diffusion cavity 200 and flows back powder on the filter element to the dispersed airflow diffusion cavity 100, and simultaneously gas and powder are mixed into gas-solid two-phase flow.
The switch for controlling the opening and closing of the back-blowing gas inlet pipe 10 and the gas inlet pipe 14 for inputting gas into the gas inlet airflow diffusion cavity 200 of the powder fluidizing device are connected with the same gas source device, so as to facilitate the operation.
The gas source device is a compressed gas bag 9.
The switches associated with each other are solenoid valves. The pressure relief filter structure also includes a control module for controlling the solenoid valve.
A bleed tube 11 for bleeding is provided at the clean gas outlet end 802 to connect to the outside atmosphere or other relatively low pressure environment.
The purified gas outlet end 802 is provided with a throttle orifice, and the diffusing pipe 11 is provided with a pressure detection device.
The raw gas inlet port 801 is arranged at the lower end of the pressure relief filtering structure and is used for being communicated with the upper part of the powder fluidizing device; the clean air outlet port 802 is disposed at the upper end of the pressure relief filter structure. Therefore, the powder can conveniently flow back to the dispersed airflow diffusion cavity 100 when back blowing or boosting air supply is performed.
This release filtration application can be for storehouse pump release filtration 8 in blast furnace gas dust collector for the setting includes on blast furnace gas dust collector's storehouse pump:
a raw gas inlet port 801 communicated with the cavity of the bin pump and provided with a fluidization spray head;
a clean gas outlet end 802 which is connected with a clean gas side channel 7 of the blast furnace gas dust removal device through an exhaust pipeline 6; the clean air outlet port 802 is provided with a restriction orifice to reduce the pressure of the air flow.
Wherein, the clean gas outlet 802 is further connected to a back-blowing gas inlet pipe 10, and the back-blowing gas inlet pipe 10 is connected to the same gas source device with a gas inlet pipe 14 for inputting fluidization kinetic energy gas to the cabin pump. The raw gas inlet port 801 is arranged at the lower end of the pressure relief filtering structure 8 of the bin pump and is used for being communicated with the upper part of the bin pump; the clean air outlet end 802 is disposed at the upper end of the pressure-relief filter structure 8.
Namely, a clean gas outlet of a pressure relief filter structure 8 of the bin pump is respectively connected with a back-blowing gas access pipe 10 and a clean gas side channel 7 through an exhaust pipeline 6; when carrying out the blowback, blowback gas carries out the blowback to storehouse pump release filtration 8 filter core, and the blowback gas is simultaneously to storehouse pump input fluidization kinetic energy gas, with the powder backward flow on the filter core to storehouse pump. By the method, the filter element is regenerated, and the powder is recovered.
Thus, when the bin pump is filled with the fluidization kinetic energy gas, the fluidization kinetic energy gas enters the clean gas outlet end 802 from the back blowing gas inlet pipe 10, namely when the bin pump is filled with the fluidization kinetic energy gas, the assisting gas supply is carried out at the position of the pressure relief filtering structure 8 of the bin pump, and meanwhile, the filter element of the pressure relief filtering structure 8 of the bin pump is regenerated at the time.
The bin pump pressure relief filter structure 8 comprises a pressure equalizing filter working mode and a power-assisted gas transmission regeneration working mode;
in the pressure equalizing and filtering mode, a pressure equalizing valve on an exhaust pipeline 6 connected between a clean gas side channel 7 of the blast furnace gas dust collector and an inner cavity of a bin pump is opened, so that gas in the bin pump passes through a bin pump pressure relief filtering structure 8 and the pressure equalizing valve which are arranged on the exhaust pipeline 6 in sequence and then is discharged into the clean gas side channel 7 of the blast furnace gas dust collector through the exhaust pipeline 6;
in the pressure-equalizing filtering mode, the valves on the bin pump air inlet pipe 14 and the back-blowing air inlet pipe 10 are opened, the filter element of the bin pump pressure-relief filtering structure 8 is back-blown, back-blowing gas for back-blowing the filter element simultaneously inputs fluidization kinetic energy gas to the bin pump and returns powder on the filter element to the bin pump.
The blowback gas inlet pipe 10 and the air inlet pipe 14 of the cabin pump are provided with mutually associated valves for associating the switch of the blowback gas inlet pipe 10 with the switch of the air inlet pipe 14 of the cabin pump, so as to simultaneously operate the switch of the blowback gas inlet pipe 10 and the switch of the air inlet pipe 14 of the cabin pump. Namely, the valve on the back-blowing gas access pipe 10 and the valve on the gas inlet pipe 14 for inputting the fluidization kinetic energy gas to the bin pump are set to be in linkage control, the back-blowing regeneration work is carried out on the filter element while the bin pump is filled with the fluidization kinetic energy gas, and meanwhile, the power-assisted gas supplement is carried out on the bin pump from the other position of the bin pump, so that the efficiency of filling the fluidization kinetic energy gas into the bin pump is greatly improved, and the back-blowing regeneration of the filter element of the pressure-relief filter structure 8 of the bin pump is carried out.
The valve with the mutually associated switches is an electromagnetic valve. The bin pump pressure relief filtering structure 8 further comprises a control module for controlling the electromagnetic valve, and the control module is only a conventional PLC control module.
A branch for diffusion is arranged on the exhaust pipeline 6, namely a diffusion pipe 11 for diffusion is arranged at the clean gas outlet end 802, and a valve is arranged on the diffusion pipe 11.
The air source device is a compressed nitrogen gas bag.
Here, the exhaust duct 6 includes a first exhaust pipe 601 and a second exhaust pipe 602, one end of the first exhaust pipe 601 is connected to the clean air outlet port 802, and the other end of the first exhaust pipe 601 is connected to one end of the purge pipe 11; in the direction of the clean gas exhaust, the middle section of the first exhaust pipe 601 is sequentially provided with an air inlet of a second exhaust pipe 602 and an air outlet of a back-blowing air inlet pipe 10, and the first exhaust pipe 601 is connected with a clean gas side channel 7 of the blast furnace gas dust removal device through the second exhaust pipe 602. Through the mode, a better pipeline arrangement structure is obtained, so that the optimization of pipeline arrangement is realized.
In this embodiment, a powder conveying system is adopted, which includes a blowing-assisting and gas-supplementing channel 13 for supplementing gas to a conveying channel, wherein a gas outlet end of the blowing-assisting and gas-supplementing channel 13 is connected to the conveying channel for conveying a gas-solid two-phase flow to a target point through a gas inlet end of a connecting three-way pipe, and another gas inlet end of the three-way pipe is connected to a gas-solid two-phase flow discharge pipe 15 of a powder fluidizing device. Before the gas-solid two-phase flow is conveyed to a target point or at the same time of conveying the gas-solid two-phase flow to the target point, the blowing-assisting and gas-supplementing channel is opened. Preferably, the blowing-assisting and air-supplementing channel 13 is firstly opened, air is filled into the conveying channel, and then the gas-solid two-phase flow is conveyed into the conveying channel 12.
When the gas-solid two-phase flow is conveyed, the gas-solid two-phase flow conveyed from the three-way pipe is boosted and propelled in the conveying channel 12 through the blowing-assisting and gas-supplementing channel 13, so that the conveying state of the gas-solid two-phase flow in the conveying channel can be controlled by controlling the blowing-assisting and gas-supplementing channel 13, and the blockage removing function can be achieved.
The direction of the air outlet end of the blowing-assisting air-supplementing channel 13 is the same as that of the input end of the conveying channel, so that the gas output by the blowing-assisting air-supplementing channel 13 can be ensured to have higher utilization rate and act on the gas-solid two-phase flow in the conveying channel.
The above-mentioned conveying channel is a double-sleeve pneumatic conveying channel 12 (for the existing double-sleeve pneumatic conveying technology, reference may be made to "numerical simulation and energy consumption analysis in the double-sleeve dense-phase pneumatic conveying process, guan chunsheng, etc., proceedings of process engineering, volume 9, 4 th edition, and 8 months in 2009"). The blowing-assisting air-supplementing channel 13 is connected with a first air source device, and the inner side pipe of the double-sleeve pneumatic conveying channel 12 is connected with a second air source device. At the end position where the double-sleeve pneumatic transmission channel 12 is connected with the three-way pipe, the end of the inner bypass pipe 1201 of the double-sleeve pneumatic transmission channel 12 corresponding to the three-way pipe is provided with a plug for plugging the end of the inner bypass pipe 1201, so that more air flow from the blowing-assisting air supplementing channel 13 flows into the main pipeline in the double-sleeve pneumatic transmission channel 12. Of course, the air supply device connected to the blowing-aid air supply channel 13 may be communicated with the inner side pipe of the double-casing pneumatic conveying channel 12, and in the present embodiment, a separate independent air supply is preferably provided.
The conveying channel comprises a conveying section 12a and a connecting section 12b, an inner bypass pipe 1201 sleeved in the pneumatic ash conveying main pipe in the conveying channel is positioned on the conveying section, and the connecting section is connected with a discharge pipe 15 of the dispersed airflow diffusion cavity 100; the connecting section 12b and the arc section 15b of the discharge pipe 15 form the three-way pipe. The discharge pipe 15 comprises a straight section 15a and an arc section 15b connected to the conveying pipe 12, and the discharge end of the straight section 15a is connected with the feed end of the arc section 15 b.
At the connecting position of the arc-shaped section 15b and the connecting section 12b, the extending direction of the end head of the arc-shaped section 15b forms an included angle of 10-35 degrees with the connecting section 12b, namely, the arc-shaped section is cut into the straight section 15a at 10-35 degrees, so that the flow of gas-solid two-phase flow is smoother, and the impact with the pipe wall is reduced.
The powder conveying system comprises an ash conveying mode, and the system comprises:
the powder fluidizing device is used for mixing gas and powder into gas-solid two-phase flow;
the conveying channel is used for conveying the gas-solid two-phase flow to a target point;
the blowing-assisting air-supplementing channel 13 is connected with the conveying channel;
the blowing-assisting air-supplementing channel 13 and the air inlet pipe 14 of the powder fluidizing device are connected with the same air source device;
in the ash conveying mode of the powder conveying system, gas is filled into the conveying channel 12 through the blowing-assisting and air-supplementing channel 13.
Of course, the three-way pipe as an independent component comprises a straight pipe part (which can be a connecting section 12b of the conveying channel 12) and a bent pipe part (which can be an arc section 15b of the discharge pipe 15), wherein two ends of the straight pipe part are respectively connected with the blowing-assisting and air-supplementing channel 13 and the conveying section 12a of the conveying channel 12; one end of the elbow pipe part is connected with the middle part of the straight pipe part, and the other end of the elbow pipe part is connected with the discharge pipe 15.
When the three-way pipe is taken as an independent part, the three-way pipe is respectively connected with the discharge pipe 15, the conveying channel 12 and the blowing-assisting and air-supplementing channel 13 of the dispersed airflow diffusion cavity 100 through flanges.
One end of the blowing-assisting air-supplementing channel 13 is connected with an air inlet pipe 14 of the powder fluidizing device, and the other end of the blowing-assisting air-supplementing channel 13 is communicated with the conveying channel, so that the blowing-assisting air-supplementing channel 13 and the air inlet pipe 14 of the powder fluidizing device are connected with the same air source device. Of course, different air source devices can be connected respectively, that is, one end of the blowing-assisting air-supplying channel 13 is connected with the second air source device, and the other end is communicated with the conveying channel; the intake pipe 14 is connected to a first air source device.
This powder conveying system uses in blast furnace gas dust collector, and this system can include:
the bin pump 1 is provided with a fluidizing device and is used for fluidizing powder in the bin pump by utilizing fluidizing kinetic energy gas input into the bin pump;
the bin pump pressure relief filtering structure 8 is arranged on the bin pump 1 and the exhaust pipeline 6 of the clean gas side channel 7;
the double-sleeve pneumatic conveying channel 12 is connected with the powder receiving bin 16; the discharge pipe 15 of the bin pump is communicated with the double-sleeve pneumatic conveying channel 12; the opening interval of the inner side pipe of the double-sleeve pneumatic conveying channel 12 is 440 mm and 680 mm.
And the blowing-assisting air-supplementing channel 13 is connected with the double-sleeve pneumatic conveying channel 12, and the blowing-assisting air-supplementing channel 13 is provided with a blowing-assisting valve to boost pressure of blowing-assisting compressed gas so as to realize long-distance conveying.
The air inlet pipe 14 and the blowing-assisting air supply channel 13 of the bin pump are connected with an air source device for providing compressed air.
Namely, a powder discharge pipe 15 of the bin pump is connected with a double-sleeve pneumatic conveying channel 12 for conveying powder; the discharge pipe 15 of the bin pump is respectively connected with a powder receiving bin 16 and a back-blowing gas inlet pipe 10, and the back-blowing gas inlet pipe 10 cleans the discharge pipe 15 through back-blowing gas.
The pressure change in the pipeline is small when the double-sleeve pneumatic conveying channel 12 conveys ash, which is beneficial to improving the conveying concentration and conveying in a long distance, and although the double-sleeve pneumatic conveying channel 12 can automatically blow and block, the double-sleeve pneumatic conveying channel is connected to the back blowing gas access pipe 10, so that the active blockage removal can be rapidly realized. Namely, the low-pressure dense-phase powder from the bin pump is conveyed to the end point in a timely turbulent flow state in a bolt manner, the ash is not accumulated in the on-way pipeline in a timely blowing-assisting manner, and the conveying distance of the dense-phase powder bolt is prolonged.
By arranging the blowing-assisting air-supplying channel 13, active air-supplying blockage removal is carried out under the self-blockage removal function of the double-sleeve pneumatic conveying channel 12, the delay time of blockage removal in the double-sleeve pneumatic conveying channel 12 due to the self-blockage removal function is also reduced, and the blockage removal efficiency is improved.
The clean air outlet end 802 of the pressure-relief filter structure 8 of the bin pump is connected with the air source device, which is the air source device
The double-sleeve pneumatic conveying channel 12 comprises a conveying section 12a and a connecting section 12b, an inner bypass pipe 1201 sleeved in the pneumatic ash conveying main pipe in the double-sleeve pneumatic conveying channel 12 is positioned on the conveying section 12a, and the connecting section 12b is connected with an outlet pipe 15 of the bin pump. Through setting up linkage segment 12b and separately with transport section 12a to convenient installation, if make linkage segment 12b and the discharging pipe 15 of storehouse pump three-dimensional siphunculus structure as an organic whole, avoided linkage segment 12b and the discharging pipe 15 of storehouse pump to be connected unstably, sealed not tight problem, avoided adopting welded mode to be connected linkage segment 12b and the discharging pipe 15 realization of storehouse pump.
The part of the discharge pipe 15 of the bin pump, which is positioned outside the bin pump 1, comprises a straight section 15a and an arc section 15b, and the extending direction of the inlet end of the arc section 15b and the extending direction of the straight section 15a form an included angle of 120 degrees and 160 degrees. The angle is set under the condition so as to ensure that gas-solid two-phase objects cannot cause great abrasion to the pipe wall when reversing. The inlet portion of the arcuate segment 15b here extends in a direction tangential to the inlet end of the arcuate segment 15 b. The cut-in angle of the arc-shaped section 15b and the connecting section 12b of the double-sleeve pneumatic transmission channel 12 is 10-35 degrees, so that the abrasion of gas-solid two-phase objects to the pipe wall is reduced.
One end of the blowing-assisting air-supplementing channel 13 is connected with an air inlet pipe 14 of the bin pump, and the other end of the blowing-assisting air-supplementing channel is communicated with the double-sleeve pneumatic conveying channel 12, so that a valve of the air inlet pipe 14 of the bin pump is ensured to be used as a main valve of the blowing-assisting air-supplementing channel 13.
The purified gas outlet end 802 of the bin pump pressure relief filtering structure 8 is provided with a diffusing pipe 11 for diffusing, and the diffusing pipe 11 is provided with a valve.
The fluidizing device comprises a bottom cover 2 arranged at the lower end of a bin pump 1 and used for connecting an air inlet pipe 14, a bottom plate 101 is arranged at the upper end of the bottom cover 2, a top plate 201 is arranged at the lower end of the bin pump 1, and the bottom plate 101 and the top plate 201 clamp a powder isolation breathable layer 3 to form the fluidizing device. The raw gas inlet end of the bin pump pressure relief filtering structure 8 is arranged at the upper end of the bin pump 1. So as to realize the boosting and air supplementing at different positions on the bin pump compared with the air inlet pipe 14 of the bin pump.
As shown in fig. 11, when the blast furnace gas dust removal device is provided with a plurality of sets, it is still only necessary to provide the blowing-assisting and gas-supplementing channel 13 at the end of the double-casing pneumatic conveying channel 12, and the discharge pipe 15 of the set closest to the blowing-assisting and gas-supplementing channel 13 and the blowing-assisting and gas-supplementing channel 13 are provided as shown in fig. 2, and the discharge pipes 15 of the bin pumps in the subsequent plurality of sets of blast furnace gas dust removal devices are connected in such a way that the front and the back of the connecting section 12b are both connected with the conveying section 12a, that is, the front end of the connecting section 12b is connected with the conveying section 12a of the double-.
The conveying channel is provided with a power-assisted air replenishing system for replenishing air to the conveying channel;
the helping hand tonifying qi system includes:
the pressure detection unit comprises detection devices which are distributed on the conveying channel and are respectively used for detecting the air pressure in different channel sections on the conveying channel;
and the air supply unit comprises air supply input pipes 13a which are distributed on the conveying channel and are used for supplying air to different channel sections on the conveying channel correspondingly, and the air supply input pipes 13a are in communication connection with the corresponding detection devices through the control device.
In the process of conveying the gas-solid two-phase flow, when the pressure detection unit detects that the signal of a certain channel section is weakened or is lower than a certain set threshold value, the corresponding channel section is blocked or approaches to be blocked, the control device receives the detection signal and then controls the gas supplementing unit, and compressed gas is filled into the corresponding channel section from the gas supplementing input pipe 13a to finish blockage clearing. In an implementation, when the conveyer is transported for a long distance, a gas supply input pipe 13a for supplying gas to the conveyer 12 may be provided on the conveyer 12, and a pressure detecting device located in front of the gas supply input pipe 13a may be further provided on the conveyer 12 in a direction in which the gas-solid two-phase flow flows. The distance between the boosting blockage removing units is set according to actual needs. The delivery channel 12 is preferably a double cannula delivery channel.
The pressure detection device is arranged to detect the conveying state and condition of the powder in the conveying process of the powder, if a certain section of the conveying channel is blocked, the pressure detected by the pressure detection device behind the blocking position is abnormal, and at the moment, the air supply input pipe 13a positioned in front of the blocking position is opened to blow and clear the blockage of the blocking section. The air supply operation of each section is controlled according to the pressure detection of the corresponding pipe section, so that the necessary power of pneumatic ash conveying is maintained.
Powder conveying system and powder storage device, wherein, powder conveying system includes:
a powder receiving bin 16 for receiving powder;
the pneumatic conveying channel is used for pneumatically conveying the powder to the powder receiving bin 16 and can be a double-sleeve pneumatic conveying channel; and
and the pressure relief filtering device is arranged on the powder receiving bin 16 and is used for releasing gas in the powder receiving bin 16.
Through setting up aforementioned release filter equipment, after powder is carried to powder and is received storehouse 16, ensure that the atmospheric pressure in the powder receives the storehouse 16 and satisfy the condition of pneumatic transport, prevent simultaneously that the powder from letting out the powder and receiving storehouse 16 to reach the purpose of release, environmental protection.
The filter element of the pressure relief filter device is arranged above the powder receiving bin 16. By the arrangement, the amount of powder intercepted on the pressure relief filtering device caused by the pressure relief process can be reduced, and the intercepted powder can conveniently fall back to the powder receiving bin 16 by means of self weight.
The gas release end of the pressure relief filtering device is provided with a gas suction device which can be a fan 18, so that the air pressure in the powder receiving bin 16 can be adjusted by controlling the fan 18, and the flexibility of the powder conveying system is improved. The gas release end can be provided with a vacuum machine according to requirements.
The powder receiving bin 16 is connected with a powder fluidizing device through a pneumatic conveying channel, and a blowing-assisting and air-supplementing channel 13 for supplementing air to the pneumatic conveying channel is connected to the pneumatic conveying channel.
A pressure detection device is arranged in the powder receiving bin 16 or the pressure relief filtering device on the powder receiving bin 16. When the pressure detection device is disposed in the pressure-relief filter device, it is preferably disposed in both the clean air chamber and the raw air chamber of the pressure-relief filter device. The pressure in the clean gas cavity and the pressure in the raw gas cavity can be detected to know whether the powder receiving bin receives the powder, namely whether the powder is completely received or not, whether the powder is abnormal or not, for example, a specified pressure difference, and when the pressure difference is in a specified value, the conditions that the powder is completely received or the powder is abnormal or not, whether the powder is blocked or not can be known. Because pneumatic transmission is adopted, a signal obtained by pressure detection is a fluctuation signal, and the abnormality refers to the abnormality of the frequency of the fluctuation signal; or, the signal is interrupted, but the pressure is still detected in the conveying channel, and the pressure value is abnormal with the pressure difference detected in the powder receiving bin 16 and the pressure relief filtering device on the powder receiving bin 16, and the like.
The powder storage device comprises a powder receiving bin 16 and a pressure relief filtering device for releasing gas in the powder receiving bin 16, wherein the powder receiving bin 16 is communicated with the environment outside the powder receiving bin 16 through the pressure relief filtering device. The filter element in the pressure relief filter device may be the powder isolation breathable layer 3, or may be a dust removal cloth bag or the like. The powder-insulating air-permeable layer 3 can be preferably selected here.
The powder storage device comprises a storage device main body with an inner cavity of a powder receiving bin 16, wherein an overpressure safety valve is arranged on the storage device main body, and a material level meter for detecting high and low material limit levels is arranged on the storage device main body. This storage device main part includes upper portion and lower part, all can be provided with temperature-detecting device on above-mentioned upper portion and the lower part to carry out temperature detection to the storage device main part in real time, upper and lower part all sets up, with comparatively comprehensive temperature information that obtains, prevents that the temperature maldistribution that the deposit of powder caused from making temperature detection inaccurate.
Here, a valve for discharging the powder is provided at a lower end of the powder receiving bin 16, and a humidifying device for increasing humidity of the powder is correspondingly provided below the valve.
The pressure-equalizing effect that powder fluidizer's release filtration still played in this application. The pressure relief filtering structure of the powder fluidizing device is arranged on the powder fluidizing device, the clean gas end of the pressure relief filtering structure is selectively communicated with a first pressure relief pipeline and a second pressure relief pipeline, and the first pressure relief pipeline and the second pressure relief pipeline have pressure difference.
Through setting up this release filtration, the convenience makes different net gas end butt joint modes to powder fluidizer in the atmospheric pressure demand of difference, and the release in powder receiving, the powder output process in the convenient realization powder fluidizer like this realizes the interception to the powder in the release process of powder fluidizer simultaneously.
The first pressure relief pipeline is communicated with a clean gas conveying channel, and is applied to a blast furnace gas dust removal device, the clean gas conveying channel can be a clean gas side channel 7, and the output end of the second pressure relief pipeline is a diffusing end and is arranged on a diffusing pipe 11. And a valve for controlling the opening and closing of the first pressure relief pipeline is associated with a valve for discharging on the powder fluidizing device. That is, in the powder receiving mode of the powder fluidizing device, the pressure of the powder fluidizing device is released, and the opening and closing of the first pressure release pipeline corresponds to the powder receiving mode of the powder fluidizing device. And a valve for controlling the opening and closing of the second pressure relief pipeline is associated with a switch on the powder fluidizing device for opening and closing the powder output mode. That is, in the powder discharge mode of the powder fluidizing device, the pressure of the powder fluidizing device is released, and the opening and closing of the second pressure release line corresponds to the powder discharge mode of the powder fluidizing device.
The clean gas end is connected with a back-blowing gas access pipe 10. The valve for controlling the opening and closing of the blowback gas inlet pipe 10 is connected with a switch on the powder fluidization device for opening and closing the powder fluidization mode. Therefore, the blowback connection pipe 10 is used as a power-assisted air supplement pipeline of the air inlet pipe 14, blowback work is carried out at the same time, and the air inlet airflow diffusion cavity 200 has two air inlets at different positions.
The back-blowing gas inlet pipe 10 is connected with the same gas source device with the gas inlet pipe 14 for inputting gas to the gas inlet airflow diffusion cavity 200 of the powder fluidizing device, so that the control is convenient.
The pressure relief filtering structure is provided with an observation hole positioned at the lower part of the pressure relief filtering structure, and the observation hole is provided with a flange cover used for plugging the observation hole. The pressure relief filter structure also includes an end cap at the upper end of the pressure relief filter structure, the end cap being a blind flange.
The application also provides a particulate matter screening method, which is characterized in that a powder fluidizing device is adopted to screen particulate matters;
a particulate matter screening method, comprising:
receiving powder to be conveyed by using a powder receiving mode of a powder fluidizing device;
the powder fluidization mode of the powder fluidization device is used for mixing gas with the powder to be conveyed through the gas inlet structure to form gas-solid two-phase flow;
the powder output mode of the powder fluidizing device is used for conveying the gas-solid two-phase flow to a target point through the discharge pipe;
before or in the powder fluidization mode, a specified air pressure value or an air pressure value interval is set in a cavity where the mixed gas-solid two-phase flow is located, the air pressure is kept stable in the specified air pressure value or the air pressure value interval in the powder fluidization mode, the air pressure is kept in the specified air pressure value or the air pressure value interval in the powder output mode, and the corresponding gas-solid two-phase flow under the specified air pressure value or the air pressure value interval is extracted.
Under different air pressures, the suspension states of the powder with different weights are different, namely, the environment where the powder is located is layered by controlling the air pressure in the environment where the powder is located, part of the powder is suspended under the air pressure, part of the powder is precipitated under the air pressure, and the required powder is extracted after being conveyed pneumatically.
The powder fluidizing device is provided with an air exhaust pipeline, and the operation of keeping the air pressure stable within the specified air pressure value or the specified air pressure value interval comprises the step of keeping the air pressure stable within the specified air pressure value or the specified air pressure value interval by controlling the air input of the air inlet structure and the air output of the air exhaust pipeline. Therefore, the air pressure is kept in the specified air pressure value or the air pressure value interval in the process of outputting the powder, and dynamic balance is achieved, so that the required specified powder can be reliably extracted.
The powder fluidizing device comprises a powder isolating and ventilating layer 3 for gas to pass through, the powder isolating and ventilating layer 3 divides a gas inlet structure into a gas inlet airflow diffusion cavity 200 and a dispersed airflow diffusion cavity 100, and the gas passes through the gas inlet airflow diffusion cavity 200 and then forms dispersed airflow through the powder isolating and ventilating layer 3 to act on particles to be conveyed in the dispersed airflow diffusion cavity 100 so as to form the gas-solid two-phase flow.
In the powder output mode, the particles in the powder fluidizing device are extracted according to the particle level.
Powder fluidizer, including powder fluidization mode and powder output mode, this fluidizer includes:
the powder isolating and ventilating layer 3 is used for isolating particles in a powder fluidization mode and simultaneously allowing gas to pass and be mixed with the particles;
the dispersed airflow diffusion cavity 100 is positioned on one side surface of the powder isolating and ventilating layer 3, and the other side surface of the powder isolating and ventilating layer 3 corresponds to the air inlet airflow diffusion cavity 200;
and the extraction channel 19 is used for extracting the particles in the dispersed airflow diffusion cavity 100 in the powder output mode. The outlet end of the extraction channel 19 can here be connected to the double-cannula pneumatic transport channel 12.
The powder fluidizing device not only can be used as fluidizing and conveying equipment, but also can be used as a screening device for particulate matters. The powder layered in the dispersed airflow diffusion chamber 100 is extracted through the extraction passage 19 to obtain a desired powder. The particles in the gas-solid two-phase flow keep a flowing state, and are screened in the flowing state, so that the particles can be screened under different air pressures, and the screened particles can be conveyed very efficiently.
The powder isolating and air-permeable layer 3 includes a porous air-permeable film 302 for blocking particulate matter on the surface thereof.
The powder fluidizing device further comprises a powder receiving bin 16, wherein an air suction device for pumping and exhausting air in the powder receiving bin 16 is arranged on the powder receiving bin 16, the air suction device is controlled to enable the powder receiving bin 16 and the dispersed airflow diffusion cavity 100 to achieve pressure difference drainage, so that air pressure in the dispersed airflow diffusion cavity 100 can be flexibly controlled conveniently, and the air suction device can adopt a fan 18.
The dispersion airflow diffusion chamber 100 is provided with two extraction channels 19 arranged along the gravity direction to facilitate the extraction of the powder with different suspension heights. Referring to fig. 12, the present embodiment employs two extraction channels 19, and the two extraction channels 19 may be connected to the same powder receiving bin 16 or may be connected to different powder receiving devices. The double-sleeve pneumatic conveying channel 12 can be connected with a blowing-assisting air-supplementing channel 13 for assisting in conveying and clearing blockage.
The extraction passage 19 is provided with a pressure detection means, and the dispersed air flow diffusion chamber 100 may be provided with a pressure detection means.
The powder fluidizing device further comprises a pressure control module for maintaining the pressure of the dispersed gas flow diffusion chamber 100 at a specified pressure, and the pressure control module is respectively in communication connection with the gas inlet structure of the powder fluidizing device and the pressure relief structure of the powder fluidizing device.
Compared with screening methods such as a screen and the like, the method has the characteristic of high conveying efficiency, namely, gas and powder (particles) are mixed to form gas-solid two-phase flow, so that the powder is in a flowing state in the screening process, the extraction channel 19 is opened to directly extract suspended or precipitated particles, and the conveying efficiency is high.
The outlet end of the conveying channel is connected with a powder receiving bin 16, and the powder receiving bin 16 is provided with a pressure relief filtering device for releasing gas in the powder receiving bin 16 and preventing powder from leaking out.
The gas release end of the pressure relief filtering device is provided with a vacuum pump 21 for vacuumizing the powder receiving bin.
This application powder fluidizer can regard as a powder drying device, including drying mode and transport mode, above-mentioned powder drying device includes:
the gas inlet structure is used for receiving gas and mixing the gas with the powder to obtain gas-solid two-phase flow;
the discharge structure is used for discharging the water in the gas-solid two-phase flow out of the powder drying device;
and the detection component is used for detecting the humidity of the gas-solid two-phase flow in the drying process.
Through setting up this powder drying device, dry the powder through the mode that makes gas and powder mix formation gas-solid two-phase flow, compare in the mode that adopts directly to the powder heating to the mode that has formed the gas-solid two-phase flow is dried, convenient direct pneumatic transport to the powder, efficient, of course, directly dry the powder with the air current, also avoided the destruction of high temperature to the powder.
The discharge structure comprises a diffusion pipe 11 communicated with a dispersed airflow diffusion cavity 100 for accommodating gas-solid two-phase flow, so that water in the dispersed airflow diffusion cavity 100 can be conveniently discharged.
The above-mentioned detection assembly includes the humidity detection device 20 disposed at the outlet end of the discharge structure, where the humidity detection device 20 may be disposed on the diffusing pipe 11, so as to conveniently detect the completion degree of drying and the moisture content in the powder. Specifically, the exhaust structure includes the exhaust duct 6, and the humidity detection device 20 may be disposed on the exhaust duct 6.
The diffusing pipe 11 may be provided with a fan 18 or a vacuum machine, and the diffusing pipe is changed to an air exhaust pipe, and a humidity detection device 20 on the air exhaust pipe detects the exhausted air. By arranging the air exhaust pipeline, the efficiency of exhausting the moisture of the powder in the dispersed airflow diffusion cavity 100 is improved.
The air inlet structure comprises an air inlet pipe 14 for connecting a hot air source, and the air inlet structure can also heat the incoming air in a heating device mode and then enters the air inlet airflow diffusion cavity 200; the heating device or the air inlet pipe 14 is connected with a hot air source to accelerate the evaporation of the moisture in the powder.
The powder drying device also comprises a cavity for containing gas-solid two-phase flow, and a heating device which is used for being immersed into and contacted with the powder can be arranged in the cavity and is directly contacted with the powder to dry the powder.
The powder drying device also comprises a conveying device for conveying powder, and the detection assembly is in communication connection with a control module for controlling the conveying device to open and close. The conveying device can comprise a double-sleeve pneumatic conveying channel 12 and a discharging pipe 15 for outputting powder, and after the detection assembly detects a signal, the control module controls the double-sleeve pneumatic conveying channel 12 and the discharging pipe 15 to start conveying the powder, wherein the powder flows in a gas-solid two-phase flow.
The cavity is used for containing gas-solid two-phase flow, and a heating device which is used for being immersed into and contacted with the powder can be arranged in the cavity.
The gas inlet structure comprises a powder isolating and ventilating layer 3, the powder isolating and ventilating layer 3 divides a powder fluidization structure into a gas inlet airflow diffusion cavity 200 and a dispersed airflow diffusion cavity 100, and the gas passes through the gas inlet airflow diffusion cavity 200 and then forms dispersed airflow through the powder isolating and ventilating layer 3 to act on powder to be conveyed in the dispersed airflow diffusion cavity 100 so as to form the gas-solid two-phase flow.
The powder-barrier air-permeable layer 3 includes a porous air-permeable film 302 for blocking the powder on the surface thereof. The porous air-permeable film 302 is a film with the isolation rate of more than 99 percent for dust with the grain diameter of more than or equal to 0.1m in the gas to be treated. The porous, breathable film 302 has a pore density of 5X 108 pores/cm2About 30X 108 pieces/cm2。
The powder drying device can also comprise a clamping and positioning structure for shaping the powder isolation breathable layer 3, and the clamping and positioning structure is a heating device. This allows the gas to be heated directly as it passes through the powder barrier gas permeable layer 3. Specifically, the clamping and positioning structure can be electrified, and a heating pipe is arranged in the clamping and positioning structure. That is, the top plate 201 and the bottom plate 101 may be used as heating means for heating the gas passing therethrough and the powder contacting the bottom plate 101, and in this manner, the holding and positioning structure is directly changed to the heating means, and the heating means for assisting the addition of the gas may not be required.
Of course, as mentioned above, there are many ways to dry the powder;
for example, before entering the powder fluidizing device, the compressed gas is heated, the heated gas is mixed with the powder through the gas inlet structure, and the powder is dried in the fluidizing process;
for example, a heat-insulating interlayer is arranged on a device main body (bin pump) of the powder drying device, a heat transfer medium flows in the interlayer, and powder and gas are heated in a heat conduction mode, and a steam pipeline heat tracing mode can be also arranged;
for example, the powder may be subjected to a heating treatment by introducing a heating apparatus into the apparatus main body (bin pump) as described above and drying the powder by directly contacting the powder, or may be subjected to a preliminary drying treatment before the powder is supplied into the apparatus main body.
During the conveying process, a heat preservation device (such as a heat preservation interlayer, a steam pipeline and the like) can be arranged on the conveying channel, so that the gas-solid two-phase flow still keeps high drying degree during the conveying process.
The contents of the present invention have been explained above. Those of ordinary skill in the art will be able to implement the invention based on these descriptions. Based on the above-mentioned contents of the present invention, all other embodiments obtained by those skilled in the art without creative efforts shall fall within the protection scope of the present invention.

Claims (10)

1. The powder conveying system is characterized by comprising a blowing-assisting and gas-supplementing channel, wherein the gas outlet end of the blowing-assisting and gas-supplementing channel is connected with a conveying channel for conveying a gas-solid two-phase flow to a target point, and the outlet end of a discharge pipe for outputting the gas-solid two-phase flow is connected with the joint of the blowing-assisting and gas-supplementing channel and the conveying channel.
2. The powder delivery system of claim 1, wherein the outlet end of the blowing-assisted gas supplementing channel is in the same direction as the inlet end of the delivery channel.
3. The powder delivery system of claim 1, wherein the delivery channel is a dual-cannula pneumatic delivery channel.
4. The powder conveying system of claim 3, further comprising a three-way pipe, wherein a first end of the three-way pipe is connected with an air outlet end of the blowing-assisting and air-supplementing channel, a second end of the three-way pipe is connected with an inlet end of the conveying channel, and a third end of the three-way pipe is connected with an outlet end of the discharge pipe; and at the end position where the double-sleeve pneumatic conveying channel is connected with the three-way pipe, the end of the inner bypass pipe of the double-sleeve pneumatic conveying channel corresponding to the three-way pipe is provided with a plug for plugging the end of the inner bypass pipe.
5. The powder conveying system according to claim 3, wherein the conveying channel comprises a conveying section and a connecting section, an inner bypass pipe sleeved in the pneumatic ash conveying main pipe in the conveying channel is positioned on the conveying section, and the connecting section is connected with the discharge pipe of the dispersed airflow diffusion cavity.
6. The powder conveying system of claim 1, wherein the conveying channel is provided with a power-assisted air replenishing system for replenishing air to the conveying channel;
the helping hand tonifying qi system includes:
the pressure detection unit comprises detection devices which are distributed on the conveying channel and are respectively used for detecting the air pressure in different channel sections on the conveying channel;
and the air supply unit comprises air supply input pipes which are distributed on the conveying channel and are used for supplying air to different channel sections on the conveying channel correspondingly, and the air supply input pipes are in communication connection with the corresponding detection devices through a control device.
7. The powder delivery system of claim 1, comprising an ash delivery mode, the system comprising:
the powder fluidizing device is used for mixing gas and powder into gas-solid two-phase flow;
the conveying channel is used for conveying the gas-solid two-phase flow to a target point;
the blowing-assisting air-replenishing channel is connected with the conveying channel;
the air inlet pipes of the blowing-assisting air-supplementing channel and the powder fluidizing device are connected with the same air source device or different air source devices;
and in the powder conveying system, under the powder output mode, compressed gas is filled into the conveying channel through the blowing-assisting and air-supplementing channel.
8. The powder conveying system of claim 1, further comprising a three-way pipe, wherein a first end of the three-way pipe is connected with an air outlet end of the blowing-assisting and air-supplementing channel, a second end of the three-way pipe is connected with an inlet end of the conveying channel, and a third end of the three-way pipe is connected with an outlet end of the discharge pipe; the three-way pipe comprises a straight pipe part and a bent pipe part, and two ends of the straight pipe part are respectively connected with the blowing-assisting air-supplementing channel and the conveying channel; one end of the elbow pipe part is connected with the middle part of the straight pipe part, and the other end of the elbow pipe part is connected with the discharge pipe.
9. The powder conveying system according to claim 8, wherein the bent pipe portion and the straight pipe portion are connected at a position where the extending direction of the end of the bent pipe portion forms an angle of 10-35 ° with the straight pipe portion.
10. The powder conveying system of claim 7, wherein one end of the blowing-assisting and air-replenishing channel is connected with the second air source device, and the other end of the blowing-assisting and air-replenishing channel is communicated with the conveying channel; the air inlet pipe is connected with a first air source device.
CN201920261871.7U 2019-03-01 2019-03-01 Powder conveying system Active CN210113231U (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112850168A (en) * 2021-03-15 2021-05-28 成都瑞柯林工程技术有限公司 Pneumatic conveying method for particulate matters

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112850168A (en) * 2021-03-15 2021-05-28 成都瑞柯林工程技术有限公司 Pneumatic conveying method for particulate matters
CN112850168B (en) * 2021-03-15 2023-10-24 成都瑞柯林工程技术有限公司 Pneumatic conveying method for particulate matters

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