CN110386374B - Method and system for monitoring and controlling static electricity of polyolefin bin powder - Google Patents
Method and system for monitoring and controlling static electricity of polyolefin bin powder Download PDFInfo
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- CN110386374B CN110386374B CN201810352164.9A CN201810352164A CN110386374B CN 110386374 B CN110386374 B CN 110386374B CN 201810352164 A CN201810352164 A CN 201810352164A CN 110386374 B CN110386374 B CN 110386374B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
- B65D90/00—Component parts, details or accessories for large containers
- B65D90/22—Safety features
- B65D90/46—Arrangements for carrying off, or preventing the formation of electrostatic charges
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- Elimination Of Static Electricity (AREA)
- Filling Or Emptying Of Bunkers, Hoppers, And Tanks (AREA)
Abstract
The invention provides a system for monitoring and controlling polyolefin bin powder static electricity, which comprises: the elimination module is arranged on the feeding pipe of the storage bin and is used for eliminating static carried by powder entering the feeding pipe; the monitoring module is connected between the feeding pipe and the storage bin and is used for monitoring the electrification condition of the powder after static elimination; and the control module is respectively connected with the eliminating module and the monitoring module and is used for receiving the charged condition transmitted by the monitoring module and adjusting the static eliminating capability of the eliminating module according to the charged condition so as to control the static electricity of the powder within a safe value range. The monitoring module in the system for monitoring and controlling the polyolefin bin powder static electricity provided by the invention can accurately monitor the charged information entering the bin powder, and the control module adjusts the static electricity eliminating capability of the eliminating module in real time according to the charged information, thereby ensuring the safety of the polyolefin powder storage, transportation, loading and unloading operation. In addition, the system provided by the invention has a simple structure and is convenient to install and use.
Description
Technical Field
The invention relates to the technical field of petrochemical industry, in particular to a method and a system for monitoring and controlling polyolefin bin powder static electricity.
Background
In the polyolefin production process, the high-insulation polyolefin material is highly charged and accumulated in the bin in the air conveying process, for example, the flammable ethylene monomer exists in the polyethylene degassing bin, so that the minimum ignition energy of mixed powder (a mixture of ethylene and polyethylene powder) is reduced, and a flash-off event is easily caused in the degassing bin due to electrostatic discharge.
To ensure the safety of polyolefins in transportation and storage, systems capable of monitoring and controlling static electricity are needed. At present, the electrostatic charge quantity of the powder in the stock bin is mainly detected by manual operation based on the Faraday theory, and the static electricity of the required powder is difficult to monitor in real time in the polyolefin production process.
Therefore, the invention provides a method and a system for monitoring and controlling the static electricity of the powder in the polyolefin storage bin.
Disclosure of Invention
In order to solve the above problems, the present invention provides a system for monitoring and controlling static electricity of polyolefin bin powder, the system comprising:
the elimination module is arranged on the feeding pipe of the storage bin and is used for eliminating static carried by powder entering the feeding pipe;
the monitoring module is connected between the feeding pipe and the storage bin and is used for monitoring the electrification condition of the powder after static elimination;
and the control module is respectively connected with the eliminating module and the monitoring module and is used for receiving the electrification condition transmitted by the monitoring module and adjusting the static eliminating capability of the eliminating module according to the electrification condition so as to control the powder static within a safety value range.
According to one embodiment of the invention, the cancellation module comprises:
and the electrode needle is applied with positive and negative voltages, and the static electricity elimination capability is adjusted by changing the voltage values of the positive and negative voltages so as to eliminate the static electricity of the powder.
According to one embodiment of the invention, the monitoring module comprises:
the barrel comprises an inner barrel and an outer barrel, wherein the inner barrel and the outer barrel are round tables with two unsealed ends, the inner barrel is nested in the outer barrel, and powder subjected to electrostatic elimination enters the storage bin through the inner barrel;
an insulating material including a first insulating material and a second insulating material, wherein the first insulating material is connected between the inner cylinder and the outer cylinder, and the second insulating material is connected to both ends of the inner cylinder and the outer cylinder for insulating the inner cylinder and the outer cylinder;
and the sensor is connected with the cylinder and used for monitoring the electrification condition of the powder after static elimination, wherein the electrification condition comprises an electrification amount and an electrification polarity.
According to one embodiment of the invention, the insulating material is a high-insulating ceramic material.
According to one embodiment of the invention, the sensor includes a non-contact sensor that does not contact the inner barrel and a contact sensor that contacts the inner barrel.
According to one embodiment of the invention, the system further comprises a fixing bracket for fixing the monitoring module.
According to one embodiment of the present invention, the system further comprises an instrument plenum, wherein the instrument plenum comprises a first instrument plenum and a second instrument plenum, the first instrument plenum being connected to the control module, the second instrument plenum being connected between the control module and the abatement module.
According to one embodiment of the invention, the power line of the control module is provided with an explosion-proof switch.
According to one embodiment of the invention, the connection cable between all devices in the system is a shielded cable with an insulating sheath, and the shielding layer is grounded.
According to another aspect of the present invention, there is also provided a method for monitoring and controlling polyolefin bin powder static electricity, the method comprising the steps of:
static carried by powder entering the feeding pipe is eliminated through an elimination module;
monitoring the electrification condition of the powder after static elimination through a monitoring module;
and adjusting the static electricity elimination capability of the elimination module through a control module according to the electrification condition so as to control the powder static electricity within a safety value range.
The system for monitoring and controlling the static electricity of the polyolefin bin powder mainly comprises a monitoring module, a eliminating module and a control module. The monitoring module changes through perception feed bin mouth powder static quantity, and the monitoring that can be accurate gets into the electrified information of feed bin powder, and control module eliminates the electrostatic elimination ability of module according to the electrified information real-time adjustment of powder, and powder static is gathered in the effective control feed bin, prevents electrostatic discharge, ensures polyolefin powder storage transportation and loading and unloading operation safety. In addition, the system for monitoring and controlling the static electricity of the polyolefin bin powder provided by the invention is simple in structure and convenient to install and use.
Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. The objectives and other advantages of the invention will be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention and not to limit the invention. In the drawings:
FIG. 1 shows a block diagram of a system for monitoring and controlling polyolefin bin powder static electricity according to an embodiment of the invention;
FIG. 2 further shows a detailed block diagram of a system for monitoring and controlling polyolefin bin powder static electricity according to an embodiment of the invention;
FIG. 3 is a schematic diagram of a monitoring module of the system for monitoring and controlling static electricity in polyolefin bin powder according to an embodiment of the invention;
FIG. 4 is a schematic diagram of a monitoring module of a system for monitoring and controlling static electricity in a polyolefin bin according to another embodiment of the invention; and
fig. 5 shows a flow chart of a method for monitoring and controlling polyolefin silo powder static electricity according to one embodiment of the invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, embodiments of the present invention are described in further detail below with reference to the accompanying drawings.
Fig. 1 shows a block diagram of a system for monitoring and controlling static electricity of polyolefin bin powder according to an embodiment of the invention. As shown in fig. 1, the system includes an elimination module 101, a monitoring module 102, and a control module 103.
The eliminating module 101 is installed on a feeding pipe of the silo and is used for eliminating static carried by powder entering the feeding pipe. In the practical application process, an Alternating Current (AC) or Direct Current (DC) static eliminator, namely an eliminating module 101, can be installed at the mouth of the silo, the ion wind current is timely regulated by adjusting the positive and negative discharging voltages of the eliminator, and the electrostatic charge quantity of the powder entering the silo is neutralized and controlled.
However, for both AC and DC electrostatic eliminators, the charge amount of the powder in the pipe needs to be monitored, and the control voltage of the eliminating module is adjusted and controlled in time according to the charge polarity and the charge amount, so as to eliminate the electrostatic charge and prevent the powder from being charged with charges with opposite polarities. Therefore, the system for monitoring and controlling the static electricity of the polyolefin bin powder provided by the invention further comprises a monitoring module 102. The monitoring module 102 is connected between the feeding pipe and the storage bin, and is used for monitoring the electrification condition of the powder after static elimination.
In addition, the system for monitoring and controlling the static electricity of the polyolefin bin powder also comprises a control module. The control module 103 is connected to the eliminating module 101 and the monitoring module 102, respectively, as shown in fig. 1, the control module 103 is connected to the eliminating module 101 through a connection line 1, and is connected to the monitoring module 102 through a connection line 2. The control module 103 is configured to receive the charging condition transmitted by the monitoring module 102, and adjust the static electricity eliminating capability of the eliminating module 101 according to the charging condition, so as to control the powder static electricity within a safe value range.
As shown in fig. 1, in the use process of the system provided by the present invention, before the charged material enters the silo from the feeding pipe, the static electricity carried by the powder is eliminated by the eliminating module 101 installed on the feeding pipe. The monitoring module 102 is installed at a feed inlet close to the top end of the storage bin and used for monitoring the electrification condition of the powder. The monitoring module 102 accurately monitors the charged amount of powder entering the storage bin by sensing the change of the electrostatic amount of the powder at the opening of the storage bin, and transmits the charged information of the powder to the control module 103, and the control module 103 adjusts the electrostatic elimination capability of the elimination module 101 in real time according to the charged information of the powder, so that the electrostatic accumulation in the storage bin is effectively controlled, and the electrostatic discharge is prevented.
In order to solve the problem that the static electricity of the powder conveyed by air in the polyolefin production process cannot be monitored and controlled in real time, the invention provides a system for monitoring and controlling the static electricity of the powder in a polyolefin storage bin, which can monitor and control the electrostatic electrification amount of the powder/particles conveyed by air to the mouth of the storage bin in real time, prevent the storage bin from generating flammable high-energy static discharge due to the accumulation of the electrified powder and ensure the safety of the storage bin.
Fig. 2 further shows a detailed structural block diagram of a system for monitoring and controlling static electricity of polyolefin bin powder according to an embodiment of the invention. As shown in fig. 2, the system includes an abatement module 101, a monitoring module 102, a control module 103, instrument plenums 201 and 202, and a power cord 203.
The eliminating module 101 is installed on a feeding pipe of the silo and is used for eliminating static carried by powder entering the feeding pipe. According to one embodiment of the invention, the abatement module 101 contains electrode needles. The elimination module 101 utilizes the charge neutralization principle, and applies positive and negative high voltages to the electrode needle respectively to ionize air molecules, and then the air supply system blows positive and negative ions into the powder conveying pipeline, so as to eliminate powder static charges.
The monitoring module 102 is connected between the feeding pipe and the storage bin, and is used for monitoring the electrification condition of the powder after static elimination. According to an embodiment of the present invention, the monitoring module 102 is an open faraday cup, and is installed at the feed inlet close to the top of the storage bin, and monitors the electrification of the powder.
The control module 103 is connected to the eliminating module 101 and the monitoring module 102, and is configured to receive the charging condition transmitted by the monitoring module 102, and adjust the static eliminating capability of the eliminating module 101 according to the charging condition, so as to control the static electricity of the powder within the safety value range. The control module 103 is used for controlling the monitoring module 102 and the eliminating module 101 to work normally and recording monitoring data.
In addition, the system for monitoring and controlling the powder static electricity of the polyolefin storage bin provided by the invention further comprises instrument air pipes 201 and 202 and a power line 203. Wherein, the power line 203 needs to be provided with an explosion-proof switch.
According to one embodiment of the invention, the cables and instrument air ducts in the system are installed according to electrical installation design requirements. In addition, the control module 103 controls the acquisition and uploading of the charged condition data and the start and stop of the eliminating module 101.
In practical application, all the devices of the system for monitoring and controlling the powder static electricity of the polyolefin storage bin provided by the invention and relevant explosion-proof approved devices form a security explosion system which can be used in dangerous places with explosive powder mixtures on site. The system wiring provided by the invention must simultaneously comply with the requirements of the use specification of related equipment, and the wiring terminal must not be connected in error. In addition, the flange installation position of the pipeline between each device is required to prevent gas and powder from leaking.
The connecting cables of all the related devices are shielded cables with insulating sheaths, and shielding layers of the shielded cables are grounded to avoid the occurrence of damage. Installation, use and maintenance of the equipment should comply with the product specifications and the following relevant standards and specifications:
(1) GB3836.13-2013 explosive environment part 13: repair, overhaul, repair and reconstruction of equipment
(2) GB3836.15-2000 part 15 of an electrical apparatus for explosive gas environments: electric installation of dangerous place (except for coal mine)
(3) Part 16 of an electrical apparatus for an explosive gas atmosphere of GB 3836.16-2006: inspection and maintenance of electrical devices (except for coal mines)
(4) GB50257-2014 electrical device installation engineering explosion and fire hazard environment electrical device construction and acceptance criteria.
As shown in fig. 2, the system for monitoring and controlling the static electricity of the polyolefin bin powder combines the monitoring system and the eliminating system, establishes the powder static electricity monitoring and controlling system, realizes that the static electricity monitoring system and the static electricity eliminating system are feedback systems, and utilizes the monitoring module 102 to monitor the charged powder charged information as feedback data to adjust the static electricity eliminating capability of the eliminating module 101 in real time, thereby improving the static electricity eliminating efficiency of the powder and ensuring the safety of the bin. And the remote real-time online monitoring of powder static electricity in the polyolefin powder conveying process is effectively realized, the convenience is brought to operators, and the operation safety is ensured.
Fig. 3 shows a schematic structural diagram of a monitoring module of a system for monitoring and controlling static electricity of polyolefin bin powder according to an embodiment of the invention.
At present, electrostatic charge quantity of powder in a storage bin is detected mainly through manual operation, and real-time monitoring of the required powder static electricity in a polyolefin production process is difficult to achieve. Patent CN 203965528U has disclosed a polyolefin feed bin static monitor, and its principle is that the short circuit internal fixation who carries on the medium pipe casing has the Faraday section of thick bamboo, through Faraday section of thick bamboo test powder charge-to-mass ratio, prevents simultaneously that Faraday section of thick bamboo from blockking up the wind and send the pipeline, but this powder static monitoring device needs manual operation, is difficult to realize real-time supervision. In addition, patent CN 1548966a discloses a powder static electricity monitor, which has an operation principle that a tiltable constant volume charge chamber is arranged in a pipeline to detect the powder charge amount in the charge chamber. The technical contents are difficult to detect/monitor the powder charge quantity of the feed inlet of the storage bin in real time.
Therefore, the invention provides a monitoring module 102 capable of monitoring powder static electricity in real time. As shown in fig. 3, the system includes an abatement module 101, a monitoring module 102, and a mounting bracket 301. The monitoring module 102 includes an inner cylinder 1021, an outer cylinder 1022, a sensor 1023A, an insulating material 102A, and an insulating material 102B.
In an embodiment of the present invention, the monitoring module 102 is an open faraday cup installed at the inlet close to the top of the bin, and is capable of monitoring the amount and polarity of the charged powder. Wherein, the inner cylinder 1021 is insulated from the outer cylinder 1022, and the length of the inner cylinder 1021 is smaller than the length of the outer cylinder 1022.
As shown in fig. 3, the monitoring module 102 includes a barrel body, the barrel body includes an inner barrel 1021 and an outer barrel 1022, wherein both the inner barrel 1021 and the outer barrel 1022 are round tables with two ends not sealed, the inner barrel 1021 is nested inside the outer barrel 1022, and the powder after electrostatic elimination enters the storage bin through the inner barrel.
The monitoring module 102 further comprises an insulating material comprising a first insulating material and a second insulating material, wherein the first insulating material is connected between the inner barrel 1021 and the outer barrel 1022, and the second insulating material is connected at two ends of the inner barrel 1021 and the outer barrel 1022, as shown in fig. 3, the first insulating material is an insulating material 102A, and the second insulating material is an insulating material 102B. In practical applications, the insulating material 102A and the insulating material 102B may be high-insulating ceramic materials.
As shown in fig. 3, the inner barrel 1021 and the outer barrel 1022 are connected to the feed pipe and the top of the silo through the fixing bracket 301. The fixing bracket 301 is in close contact with the inner cylinder 1021 through the insulating material 102B, so as to prevent powder from entering a gap between the inner cylinder and the outer cylinder, and ensure that the inner cylinder 1021 is an isolated conductor.
When powder with the charge quantity of Q passes through the inner cylinder 1021, the inner wall of the inner cylinder 1021 induces charges with the charge quantity of-Q, and meanwhile, the outer wall of the inner cylinder 1021 is provided with the charges with the same quantity and different sign of Q due to charge conservation, so that potential difference exists between the inner cylinder 1021 and the grounding outer cylinder 1022, the inner cylinder 1021 is used as a test electrode, and the charge quantity and the charge polarity of the powder entering the storage bin can be obtained by monitoring the potential difference between the inner cylinder 1021 and the outer cylinder 1022.
According to an embodiment of the present invention, when the powder passes through the inner cylinder 1021, assuming that the charge amount of the powder in the inner cylinder 1021 is Q, the corresponding volume is V, and the capacitance between the inner cylinder and the ground is C, the powder density ρ can be approximated as:
ρ＝Q/V＝UC/SL (1)
where U is the inner barrel to ground potential, S is the interfacial area of the material passing through the monitoring module 102 (the cross-sectional area of the available feed conduit), and L is approximately the vertical height through which the material passes through the inner barrel. S, C, L, the design time of the monitoring module 102 is determined, and the charge amount and the charge polarity of the powder can be obtained by testing the size of U. The control module 103 can measure the probability of danger in the silo according to the powder density so as to adjust the static electricity eliminating capability of the eliminating module.
Preferably, the inner and outer cylinders shown in fig. 3 can be designed to have an inlet diameter smaller than an outlet diameter, so as to reduce friction between the powder and the inner cylinder and reduce interference during the test.
Fig. 4 shows a schematic structural diagram of a monitoring module of a system for monitoring and controlling static electricity of polyolefin bin powder according to another embodiment of the invention. As shown in fig. 3, the difference is that the sensor 1023B in fig. 4 is a contact sensor that contacts the inner cylinder 1021, and the sensor 1023A in fig. 3 is a non-contact sensor that does not contact the inner cylinder 1021.
Fig. 5 shows a flow chart of a method for monitoring and controlling polyolefin silo powder static electricity according to one embodiment of the invention.
First, in step S501, static electricity carried by powder entering the feed pipe is eliminated by the elimination module. In an embodiment, the eliminating module may include an electrode needle, the electrode needle applies positive and negative voltages, and the static electricity eliminating capability of the eliminating module is adjusted by changing the voltage values of the positive and negative voltages, so as to eliminate the static electricity of the powder.
Then, in step S502, the charging condition of the powder after the static elimination is monitored by the monitoring module. The monitoring module can monitor the electrification condition of the powder, and the electrification condition comprises the electrification amount and the electrification polarity. And after the monitoring module monitors the electrification condition of the powder, the relevant information of the electrification condition is transmitted to the control module.
Finally, in step S503, the control module adjusts the static electricity eliminating capability of the eliminating module according to the charging condition, so as to control the static electricity of the powder within the safe value range. The control module can receive the electrification condition information transmitted by the monitoring module to evaluate the powder static condition according to the electrification condition, so that the static elimination capability of the elimination module is adjusted, and the safety of the storage bin is ensured.
The system for monitoring and controlling the static electricity of the polyolefin bin powder mainly comprises a monitoring module, a eliminating module and a control module. The monitoring module changes through perception feed bin mouth powder static quantity, and the monitoring that can be accurate gets into the electrified information of feed bin powder, and control module eliminates the electrostatic elimination ability of module according to the electrified information real-time adjustment of powder, and powder static is gathered in the effective control feed bin, prevents electrostatic discharge, ensures polyolefin powder storage transportation and loading and unloading operation safety. In addition, the system for monitoring and controlling the static electricity of the polyolefin bin powder provided by the invention is simple in structure and convenient to install and use.
It is to be understood that the disclosed embodiments of the invention are not limited to the particular structures, process steps, or materials disclosed herein but are extended to equivalents thereof as would be understood by those ordinarily skilled in the relevant arts. It is also to be understood that the terminology used herein is for the purpose of describing particular embodiments only, and is not intended to be limiting.
Reference in the specification to "one embodiment" or "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment of the invention. Thus, the appearances of the phrase "one embodiment" or "an embodiment" in various places throughout this specification are not necessarily all referring to the same embodiment.
Although the embodiments of the present invention have been described above, the above description is only for the convenience of understanding the present invention, and is not intended to limit the present invention. It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (8)
1. A system for monitoring and controlling polyolefin bin powder static, the system comprising:
the elimination module is arranged on the feeding pipe of the storage bin and is used for eliminating static carried by powder entering the feeding pipe;
the monitoring module is connected between the feeding pipe and the storage bin and is used for monitoring the electrification condition of the powder after static elimination;
the control module is respectively connected with the eliminating module and the monitoring module and is used for receiving the electrification condition transmitted by the monitoring module and adjusting the static eliminating capability of the eliminating module according to the electrification condition so as to control the powder static within a safety value range;
the monitoring module comprises:
the barrel comprises an inner barrel and an outer barrel, wherein the inner barrel and the outer barrel are round tables with two unsealed ends, the inlet diameter of the inner barrel and the inlet diameter of the outer barrel are smaller than the outlet diameter, the inner barrel is nested in the outer barrel, and powder subjected to electrostatic elimination enters the bin through the inner barrel;
an insulating material including a first insulating material and a second insulating material, wherein the first insulating material is connected between the inner cylinder and the outer cylinder, and the second insulating material is connected to both ends of the inner cylinder and the outer cylinder for insulating the inner cylinder and the outer cylinder;
the sensor is connected with the cylinder and used for monitoring the electrification condition of the powder after static elimination, wherein the electrification condition comprises electrification amount and electrification polarity;
the system still contains the fixed bolster, and it is used for fixing monitoring module, the inner tube with the urceolus passes through the fixed bolster links to each other with inlet pipe and feed bin top, the fixed bolster with the inner tube passes through second insulating material in close contact with prevents that the powder from getting into the space between the inner and urceolus, guarantees simultaneously the inner tube is isolated conductor.
2. The system for monitoring and controlling polyolefin bin powder static electricity of claim 1, wherein the elimination module comprises:
and the electrode needle is applied with positive and negative voltages, and the static electricity elimination capability is adjusted by changing the voltage values of the positive and negative voltages so as to eliminate the static electricity of the powder.
3. The system for monitoring and controlling polyolefin silo powder static as recited in claim 1, wherein the insulating material is a high insulating ceramic material.
4. The system for monitoring and controlling polyolefin silo powder static as recited in claim 1, wherein the sensor comprises a non-contact sensor that does not contact the inner barrel and a contact sensor that contacts the inner barrel.
5. The system according to claim 1, further comprising an instrument air duct, wherein the instrument air duct comprises a first instrument air duct and a second instrument air duct, the first instrument air duct is connected to the control module, and the second instrument air duct is connected between the control module and the elimination module.
6. The system for monitoring and controlling polyolefin bin powder static electricity according to claim 1, wherein a power line of the control module is provided with an explosion-proof switch.
7. The system for monitoring and controlling polyolefin silo powder static electricity as claimed in claim 1, wherein the connecting cable between all devices in the system is a shielded cable with an insulating sheath, and the shielding layer is grounded.
8. Method for monitoring and controlling polyolefin silo powder static electricity, characterized in that the following steps are performed by the system for monitoring and controlling polyolefin silo powder static electricity according to any of claims 1-7:
static carried by powder entering the feeding pipe is eliminated through an elimination module;
monitoring the electrification condition of the powder after static elimination through a monitoring module;
and adjusting the static electricity elimination capability of the elimination module through a control module according to the electrification condition so as to control the powder static electricity within a safety value range.
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| CN203965528U (en) * | 2014-07-30 | 2014-11-26 | 大庆安惟特科技有限公司 | Polyolefin bunker electrostatic monitor |
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2018
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|---|---|---|---|---|
| JPH08301390A (en) * | 1995-04-28 | 1996-11-19 | Sekisui Plastics Co Ltd | Monitoring device for static charge |
| CN1549664A (en) * | 2003-05-10 | 2004-11-24 | 江苏东强股份有限公司 | Pipeline type powder bunker electrostatic remover |
| CN201309711Y (en) * | 2008-11-07 | 2009-09-16 | 中国石油天然气集团公司 | Powdery material electrostatic elimination device of fully-automatic hopper |
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