阅读说明：本技术 一种管道粉体静电在线监测装置 (Pipeline powder static on-line monitoring device ) 是由 宫宏 李亮亮 刘全桢 高鑫 李义鹏 孙立富 孟鹤 张婷婷 浦鹤 初本林 于 2018-06-06 设计创作，主要内容包括：本发明提供了一种管道粉体静电在线监测装置,包括与风送管道相通的输料管道,输料管道的侧壁设有密封室和用于放置法拉第筒的法拉第筒容纳腔,法拉第筒的一个侧面为与输料管道同轴的弧板,法拉第筒中与该弧板相对的侧面固定在密封室的外壁上,法拉第筒的底面开有尺寸可调的孔洞；密封室内设有电场感应板,电场感应板通过导电螺栓与法拉第筒相连并固定在密封室的内壁上,正对于电场感应板的工作面且间隔一定距离处设有静电测试仪,密封室外设有信号处理设备,信号处理设备通过导线与静电测试仪相连。作为物料采集设备的法拉第筒将物料带电量信号引出到电场感应板上,再通过静电测试仪、信号处理设备对管道粉体静电量进行实时测量。(The invention provides a pipeline powder static online monitoring device, which comprises a material conveying pipeline communicated with a wind delivery pipeline, wherein the side wall of the material conveying pipeline is provided with a sealing chamber and a Faraday cylinder accommodating cavity for placing a Faraday cylinder, one side surface of the Faraday cylinder is an arc plate coaxial with the material conveying pipeline, the side surface of the Faraday cylinder opposite to the arc plate is fixed on the outer wall of the sealing chamber, and the bottom surface of the Faraday cylinder is provided with a hole with adjustable size; be equipped with electric field induction plate in the seal chamber, electric field induction plate passes through conductive bolt and links to each other and fix on the inner wall of seal chamber with Faraday's section of thick bamboo, just is equipped with the static tester to electric field induction plate's working face and interval certain distance department, and the seal chamber is equipped with signal processing equipment outward, and signal processing equipment passes through the wire and links to each other with the static tester. A Faraday cylinder serving as material collecting equipment leads out a material charge quantity signal to an electric field induction plate, and then an electrostatic tester and signal processing equipment are used for measuring the electrostatic quantity of pipeline powder in real time.)

1. A pipeline powder static on-line monitoring device comprises a material conveying pipeline communicated with a wind conveying pipeline, and is characterized in that a measuring chamber is arranged on the side wall of the material conveying pipeline and comprises a sealing chamber and a Faraday cylinder accommodating cavity, the Faraday cylinder accommodating cavity and the material conveying pipeline are of a communicated integrated structure, a Faraday cylinder is arranged in the Faraday cylinder accommodating cavity, one side surface of the Faraday cylinder is an arc plate coaxial with the material conveying pipeline, the side surface of the Faraday cylinder opposite to the arc plate is fixed on the outer wall of the sealing chamber, and a hole with an adjustable size is formed in the bottom surface of the Faraday cylinder;

Be equipped with electric field induction plate in the seal chamber, electric field induction plate pass through conductive bolt with Faraday's section of thick bamboo links to each other to fix on the inner wall of seal chamber, electric field induction plate and Faraday's section of thick bamboo parallel, electric field induction plate's working face back to Faraday's section of thick bamboo, just be equipped with the electrostatic tester to electric field induction plate's working face and interval certain distance department, the seal chamber is equipped with signal processing equipment outward, signal processing equipment passes through the wire and links to each other with the electrostatic tester in the seal chamber.

2. The pipeline powder static on-line monitoring device of claim 1, wherein the faraday cage comprises a metal outer cylinder and a metal inner cylinder.

3. The pipeline powder static on-line monitoring device of claim 2, wherein an insulating layer filled with insulating material is arranged between the metal outer cylinder and the metal inner cylinder.

4. The pipeline powder static on-line monitoring device of claim 3, wherein the conductive bolt is connected with the metal inner cylinder and insulated from the metal outer cylinder.

5. the pipeline powder static on-line monitoring device of claim 4, wherein the length of the metal inner cylinder is smaller than the length of the metal outer cylinder.

6. The pipeline powder static on-line monitoring device of claim 1, wherein the bottom of the hole is provided with a hole baffle and a baffle fixing bolt, and the size of the hole is adjusted by adjusting the position of the hole baffle and fixing the hole baffle by the baffle fixing bolt.

7. The pipeline powder static on-line monitoring device of claim 1, wherein a cross beam is arranged in the sealing chamber, and the static tester is fixed on the inner wall of the sealing chamber through the cross beam.

8. The pipeline powder static on-line monitoring device of claim 1, wherein the wire is a shielded cable with an insulating sheath.

9. The pipeline powder static on-line monitoring device of claim 8, wherein the shielding layer of the shielded cable is grounded.

Technical Field

The invention relates to the field of petrochemical engineering safety, in particular to a pipeline powder static on-line monitoring device.

Background

The production process of polyolefin and polyester in petrochemical industry adopts an air conveying system to realize the operations of conveying, mixing and packaging powder materials. The high-insulation polyolefin and polyester particles are in frictional electrification with the pipeline, and the high-electrification materials enter the storage bin through the pipeline to cause the wall sticking phenomenon of the storage bin and even the storage bin flash explosion accident. In contrast, at present, an ion wind static electricity eliminating system is often used to eliminate and control the pipeline powder static electricity, however, when the powder static electricity eliminating equipment is used to eliminate the pipeline powder static electricity, the pipeline material static electricity amount needs to be obtained in advance to adopt a proper electricity eliminating control voltage. Therefore, the electrostatic charged quantity of materials entering the storage bin needs to be monitored electrostatically.

The most effective method is currently a faraday cage measurement method, such as a powder static monitor disclosed in patent publication No. CN 1548966 and a polyolefin silo static monitor disclosed in patent publication No. CN 203965528U. However, the prior art can only carry out intermittent or single static measurement on the pipeline material by controlling the Faraday cylinder when in need, and cannot realize continuous and real-time measurement.

Disclosure of Invention

Aiming at the problems, the invention provides a pipeline powder static online monitoring device, which utilizes a bottom opening type Faraday cylinder arranged in a side wall sealing chamber of a conveying pipeline as material collecting equipment to ensure that a certain volume/mass of charged materials are always kept in the Faraday cylinder, a material charge capacity signal in the Faraday cylinder is led out to an electric field induction plate, and the continuous, efficient and accurate measurement of the pipeline powder static capacity is realized by measuring the charge signal on the electric field induction plate in real time.

the invention adopts the following technical scheme:

A pipeline powder static on-line monitoring device comprises a material conveying pipeline communicated with a wind conveying pipeline, wherein a measuring chamber is arranged on the side wall of the material conveying pipeline and comprises a sealing chamber and a Faraday cylinder accommodating cavity, the Faraday cylinder accommodating cavity and the material conveying pipeline are of a communicated integrated structure, a Faraday cylinder is arranged in the Faraday cylinder accommodating cavity, one side surface of the Faraday cylinder is an arc plate coaxial with the material conveying pipeline, the side surface of the Faraday cylinder opposite to the arc plate is fixed on the outer wall of the sealing chamber, and a hole with an adjustable size is formed in the bottom surface of the Faraday cylinder;

Be equipped with electric field induction plate in the sealed chamber, electric field induction plate pass through conductive bolt with Faraday's section of thick bamboo links to each other to fix on the inner wall of sealed chamber, electric field induction plate and Faraday's section of thick bamboo parallel, and electric field induction plate's working face back of the body is to Faraday's section of thick bamboo, just is equipped with the electrostatic tester to electric field induction plate's working face and interval certain distance department, and the sealed chamber is equipped with signal processing equipment outward, signal processing equipment passes through the wire and links to each other with the electrostatic tester in the sealed chamber.

Preferably, the faraday cage comprises a metal outer cylinder and a metal inner cylinder.

Preferably, an insulating layer filled with insulating materials is arranged between the metal outer cylinder and the metal inner cylinder.

Preferably, the conductive bolt connected with the electric field induction plate and the faraday cup is connected with the inner metal cylinder and insulated from the outer metal cylinder.

preferably, the length of the metal inner cylinder is smaller than that of the metal outer cylinder.

Preferably, the bottom of hole is equipped with hole baffle and baffle fixing bolt, and the size of hole is adjusted through adjusting the position of hole baffle and fixing the hole baffle through baffle fixing bolt.

Preferably, a cross beam is arranged in the sealed chamber, and the static electricity tester is fixed on the inner wall of the sealed chamber through the cross beam.

Preferably, the conductor is a shielded cable with an insulating sheath.

Preferably, the shield layer of the shielded cable is grounded.

The invention has the beneficial effects that:

The pneumatic conveying pipeline material static online monitoring device has the advantages of being capable of continuously, efficiently and quickly and accurately measuring static quantity in real time, and the like, can be used for constructing the pneumatic conveying powder static online monitoring and static elimination interlocking control system, realizes remote and real-time online monitoring of powder static in the pipeline powder conveying process, facilitates operators, and ensures operation safety.

Drawings

Fig. 1 is a schematic structural diagram of a pipeline powder static on-line monitoring device.

Fig. 2 is a schematic structural view of a faraday cage.

fig. 3 is a schematic top view of the pipeline powder static on-line monitoring device.

wherein, 1 is a material conveying pipeline; 2 is a sealed chamber; 3 is a Faraday cylinder (31 is a hole on the bottom surface of the Faraday cylinder, 32 is a hole baffle, 33 is a baffle fixing bolt); 4 is an electric field induction plate; 5 is a static tester; 6 is a signal processing device; and 7 is a flange.

Detailed Description

The invention is described in detail below with reference to the accompanying drawings:

Referring to fig. 1 and 2, an online pipeline powder static monitoring device comprises a material conveying pipeline communicated with an air conveying pipeline, wherein an upper feed inlet and a lower feed inlet of the material conveying pipeline are connected with the air conveying pipeline through flanges, and the mounting positions of the flanges are required to prevent gas and powder from leaking. The lateral wall of conveying pipeline is equipped with the measuring room, the measuring room holds the chamber including sealed room and Faraday's cylinder, Faraday's cylinder holds the chamber and is communicating integrative structure with conveying pipeline, Faraday's cylinder holds the intracavity and is equipped with Faraday's cylinder, one side of Faraday's cylinder is the arc board coaxial with conveying pipeline, fix on the outer wall of sealed room with the side that this arc board is relative in Faraday's cylinder, open the bottom surface of Faraday's cylinder has size adjustable hole, the bottom of hole is equipped with hole baffle and baffle fixing bolt, the size of hole is adjusted through adjusting the position of hole baffle and fixing the hole baffle through baffle fixing bolt. The Faraday cylinder comprises a metal outer cylinder and a metal inner cylinder, an insulating layer filled with insulating materials is arranged between the metal outer cylinder and the metal inner cylinder, and the length of the metal inner cylinder is smaller than that of the metal outer cylinder.

An electric field induction plate and a cross beam are arranged in the sealed chamber, the electric field induction plate is connected with the Faraday cylinder through a conductive bolt, and is fixed on the inner wall of the sealed chamber through the conductive bolt, the conductive bolt is connected with the metal inner cylinder and insulated with the metal outer cylinder to form an electric field induction plate which is connected with the metal inner cylinder of the Faraday cylinder through the conductive bolt in an equipotential manner and is parallel to the Faraday cylinder, the working surface of the electric field induction plate is back to the Faraday cylinder, a static electricity tester is arranged at a position which is opposite to the working surface of the electric field induction plate and is at a certain distance, the static electricity tester is fixed on the inner wall of the sealing chamber through a cross beam, a signal processing device is arranged outside the sealing chamber, the signal processing device is connected with the static electricity tester in the sealing chamber through a lead, the wire is a shielded cable with an insulating sheath, and a shielding layer of the shielded cable is grounded, so that the phenomenon of damage is avoided.

The Faraday cylinder is used as a material collecting device, materials are conveyed into an inner cylinder of the Faraday cylinder through a feed inlet when conveyed (entering a stock bin) and do not leak into a sealed chamber, the materials flowing through the Faraday cylinder can return into the feed pipe and do not leak into the sealed chamber, the size of a hole at the bottom of the Faraday cylinder is adjusted in advance according to field process parameters during application, namely, the material quantity inside the Faraday cylinder is adjusted by manually adjusting the size of the hole at the bottom of the Faraday cylinder, the materials with certain quality or volume are ensured to be always kept in the Faraday cylinder when powder flows through a feed pipe so as to generate an electrostatic electric field signal, the Faraday cylinder with the hole at the bottom is used as a powder charge quantity online detecting device, and the material charge quantity and the charge polarity are detected/monitored.

When a material with the charge quantity of Q passes through the metal inner cylinder, the inner wall of the metal inner cylinder induces the charge with the charge quantity of-Q, and meanwhile, the outer wall of the metal inner cylinder carries the charge with the same quantity and different sign of Q due to charge conservation, so that potential difference is generated between the metal inner cylinder and the grounding metal outer cylinder, the metal inner cylinder is used as a test electrode, and the charge quantity and the charge polarity of the material entering the storage bin are indirectly obtained by detecting or monitoring the potential difference between the metal inner cylinder and the grounding metal outer cylinder.

The static electric field that the Faraday cylinder gathered conveys on the electric field induction plate through conducting bolt, and photoelectric type static tester converts the electric field signal that detects into standard industrial signal (4-20 milliamperes) through signal processing equipment, then conveys in the control system thereby provides accurate material charge volume information. And then the control signal can be transmitted to a high-voltage discharge power supply control signal of a pipeline powder static elimination system to form a static on-line monitoring and interlocking control system. The static tester is used for detecting the electrified signal of the electric field induction plate in real time, and the detected signal is processed and sent to the control system in real time, so that the real-time online measurement of the static quantity of the pipeline material is realized.

It is to be understood that the above description is not intended to limit the present invention, and the present invention is not limited to the above examples, and those skilled in the art may make modifications, alterations, additions or substitutions within the spirit and scope of the present invention.