CN101876644B - Sensing device used for monitoring pulverized coal concentration - Google Patents

Sensing device used for monitoring pulverized coal concentration Download PDF

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Publication number
CN101876644B
CN101876644B CN2010101571505A CN201010157150A CN101876644B CN 101876644 B CN101876644 B CN 101876644B CN 2010101571505 A CN2010101571505 A CN 2010101571505A CN 201010157150 A CN201010157150 A CN 201010157150A CN 101876644 B CN101876644 B CN 101876644B
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China
Prior art keywords
sensing
oval
coal powder
powder density
tube
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Expired - Fee Related
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CN2010101571505A
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Chinese (zh)
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CN101876644A (en
Inventor
胡红利
高享想
徐通模
周屈兰
惠世恩
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Xian Jiaotong University
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Xian Jiaotong University
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Priority to CN2010101571505A priority Critical patent/CN101876644B/en
Publication of CN101876644A publication Critical patent/CN101876644A/en
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Publication of CN101876644B publication Critical patent/CN101876644B/en
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Abstract

The invention discloses a sensing device used for monitoring pulverized coal concentration, which comprises a measurement section. An inner tube, an electrode, an inner isolator, an inner shield, an outer isolator, an outer tube and an outer shield are arranged from the inside to the outside of the section of the measurement section in turn. The sensing device is characterized in that: the section of the measurement section is oval; two electrodes are symmetrically arranged on the outer side of the minor axis of the oval inner tube; the outer tube of the measurement section is an oval steel tube also serving as the outer shield; two ends of the steel tube are run-through in a way of external tangent or internal tangent respectively through a transitional surface and a tubular section; a free end of the tubular section is provided with a flange connected with a pipeline of a pulverized coal transmission system; and the oval steel tube, and the transitional surface and the tubular section connected therewith into a whole are provided with horizontal joint faces by passing the oval long axis along the axial direction.

Description

A kind of sensing device that is used to monitor coal powder density
Technical field
The present invention relates to the Dual-Phrase Distribution of Gas olid field of measuring technique, particularly a kind of coal powder density on-line monitoring sensing device that is applicable to the defeated powder system of heat power plant boiler.
Background technology
The most of electric power energy of China is provided by the coal-burning power plant at present, and the abundant burning of coal not only can improve rate of energy, and can reduce pulverized coal particle, CO, NO XGeneration Deng pollutant.Therefore, on pulverized coal feed pipe, coal powder density is carried out on-line measurement, thereby, realize that clean burning is significant for defeated powder end provides reliable parameter.Coal powder density measurements in the defeated powder system of coal-burning boiler is the Dual-Phrase Distribution of Gas olid measurement of utmost point dilute phase, is one and strides that power, electric, telecommunications are multi-disciplinary to be rich in challenging work.
Existing a kind of capacitance-type sensing device of monitoring coal powder density is made up of interior pipe, electrode, interior insulation, inner screening, external insulation, outer tube and external shield, and its inner and outer pipe is a circular pipe, and the defeated powder system of can packing into needs in the pipeline of detectable concentration.The potential electrode mounted in pairs is in the periphery (Fig. 1) of circular pipe.This sensing device adopts the double shield technology, links to each other through the design follower between the screen layer, can guarantee that measurement data does not receive extraneous interference.But there is following problems in the sensing device of this structure: because number of electrodes is many, not only complex structure is made difficulty, and is made electrode width narrow, and electrode separation is away from (diameter of inner pipe), thereby the electrode electricity capacity is little, and the sensitivity of electrode induction is lower.
Summary of the invention
To the existing deficiency of existing cylindrical shape sensing device, the invention provides a kind of capacitance-type sensing device based on oval measuring section structure.Its electrode is made not only simple, also can increase the capacitor plate area simultaneously, reduces polar plate spacing, under the prerequisite that does not influence real-time, improves the electrode induction sensitivity.
For reaching above purpose, the present invention takes following technical scheme to be achieved:
A kind of sensing device that is used to monitor coal powder density; Comprise measuring section; Its cross section is disposed with interior pipe, electrode, interior insulation, inner screening, external insulation, outer tube and external shield from inside to outside, it is characterized in that, said measuring section cross section is oval; Two electrodes are symmetricly set on the outside of oval interior pipe short-axis direction; The measuring section outer tube is the oval steel pipe of double as external shield, and these steel pipe two ends are passed through through transition face and the circumscribed or interior cut of cylindrical section respectively, and the free end of cylindrical section is provided with the flange that connects defeated powder system pipeline; Said oval steel pipe and the transition face that is connected as a single entity with it, cylindrical section are crossed oval major axis vertically and are provided with the horizontal parting face.
In the such scheme, the axial ratio of pipe is 1 in the said ellipse: 0.6-0.8.Pipe is alumina ceramic tube in the said ellipse, and said electrode is that nickel plating forms after adopting molybdenum manganese metal technology with the outside of molybdenum manganese composite metal powder sintering pipe short-axis direction in oval.Insulation is epoxy resin or silicone sealant in said.Said inner screening is a copper sheet.Said external insulation is that asbestos paper or rope twine formation.Said oval steel pipe periphery is provided with the folder hoop.
Compared with prior art, the oval test section design proposal of the present invention has increased the capacitor plate area, reduces polar plate spacing (short-axis direction), under the prerequisite that does not influence real-time, can significantly improve the sensitivity of capacitance sensing.The present invention is joined through the transition face continuity by oval test section and cylindrical section, makes the ellipse measuring channel to link to each other with circular pulverized coal feed pipe easily, has realized the practical application of ellipse double shield sensor in commercial production.
Description of drawings
Fig. 1 is the sectional view of circular sensing device.
Fig. 2 is the oval measure portion sectional view of the present invention.
Fig. 3 is a kind of circumscribed-type elliptical tube coal powder density measurement mechanism profile diagram of the present invention.
Fig. 4 is the side view of Fig. 3.
Fig. 5 is the profile diagram of another kind of endo-type elliptical tube coal powder density measurement mechanism of the present invention.
Fig. 6 is the side view of Fig. 5.
Reference numeral among Fig. 1 to Fig. 6: 1, interior pipe; 2, electrode; 3, interior insulation; 4, inner screening; 5, external insulation; 6, outer tube; 7, external shield; 8, cylindrical section; 9, transition face; 10, oval measuring section; 11, folder hoop; 12, horizontal parting face.A, major axis; B, minor axis.
Embodiment
Below in conjunction with accompanying drawing and specific embodiment the present invention is done further detailed description.
Embodiment 1
Like Fig. 2-shown in Figure 4, a kind of sensing device that is used to monitor coal powder density comprises oval measuring section 10, its cross section be disposed with from inside to outside oval in the oval outer tube 6 of pipe 1, electrode 2, interior insulation 3, inner screening 4, external insulation 5, double as external shield.Two electrodes 2 are symmetricly set on the outside of oval interior pipe 1 short-axis direction; Outer tube 6 is processed oval measuring section 10 by steel pipe; These ellipse measuring section two ends are passed through through transition face 9 and cylindrical section 8 outer cuts respectively, and the transition face of its inner transverse direction both sides and cylinder is done the sloping in case accumulated powder.The free end of cylindrical section 8 can weld the flange (not drawing among the figure) that connects defeated powder system pipeline; Outer tube 6 and the transition face 9 that is connected as a single entity with it, cylindrical section 8 are crossed oval major axis vertically and are provided with horizontal parting face 12.
The axial ratio of pipe 1 is 1: 0.6 in oval, processes ceramic pipe by alumina material, and electrode 2 adopts molybdenum manganese metal technology that the nickel plating behind the outside of ceramic pipe short-axis direction of molybdenum manganese composite metal powder sintering is formed.Then with can be anti-the above bisphenol-A phenolic epoxy resin [CYDBN-240] of 260 degree or (electric equipment) special-purpose silicone sealant [JZH-888] be coated in electrode 2 outsides form in insulation 3; The outsourcing copper sheet forms inner screening 4 again, is filled with epoxy resin or silicone sealant between electrode 2 and the inner screening 4.Treat epoxy resin or silicone sealant with electrode 2 and inner screening 4 bonding firmly after; Twine asbestos paper or rope formation external insulation 5 in the copper sheet outside of inner screening 4; At last said modules is installed in the outer tube 6 that is connected as a single entity with transition face 9, cylindrical section 8 that has a horizontal parting face 12, the free end of cylindrical section 8 flange of burn-oning gets final product.For guaranteeing the fixing of whole sensing device, prevent to leak at the scene powder, can use folder hoop 11 further fastening in oval steel pipe periphery again with the electric welding of oval steel pipe seam crossing is firm up and down.
Embodiment 2
Like Fig. 2, Fig. 5, shown in Figure 6, another kind of the present invention is used to monitor the sensing device of coal powder density, is with embodiment 1 difference: outer tube 6 two ends are passed through through transition face 9 and cylindrical section 8 interior cuts respectively; The axial ratio of pipe 1 is 1: 0.8 in oval, and other structure is all identical with embodiment 1.

Claims (8)

1. sensing device that is used to monitor coal powder density; Comprise measuring section; Its cross section is disposed with interior pipe, electrode, interior insulation, inner screening, external insulation, outer tube and external shield from inside to outside, it is characterized in that, said measuring section cross section is oval; Two electrodes are symmetricly set on the outside of oval interior pipe short-axis direction; The measuring section outer tube is the oval steel pipe of double as external shield, and these steel pipe two ends are passed through through transition face and the circumscribed or interior cut of cylindrical section respectively, and the free end of cylindrical section is provided with the flange that connects defeated powder system pipeline; Said oval steel pipe and the transition face that is connected as a single entity with it, cylindrical section are crossed oval major axis vertically and are provided with the horizontal parting face.
2. the sensing device that is used to monitor coal powder density as claimed in claim 1 is characterized in that, the axial ratio of pipe is 1 in the said ellipse: 0.6-0.8.
3. the sensing device that is used to monitor coal powder density as claimed in claim 1 is characterized in that, pipe is alumina ceramic tube in the said ellipse.
4. the sensing device that is used to monitor coal powder density as claimed in claim 3 is characterized in that, said electrode is that nickel plating forms after adopting the outside of molybdenum manganese metal technology manages molybdenum manganese composite metal powder sintering in the aluminium oxide ceramics ellipse short-axis direction.
5. the sensing device that is used to monitor coal powder density as claimed in claim 1 is characterized in that, said interior insulation is epoxy resin or silicone sealant.
6. the sensing device that is used to monitor coal powder density as claimed in claim 1 is characterized in that, said inner screening is a copper sheet.
7. the sensing device that is used to monitor coal powder density as claimed in claim 1 is characterized in that, said external insulation is that asbestos paper or rope twine formation.
8. like the described sensing device that is used to monitor coal powder density of one of claim 1 to 7, it is characterized in that said oval steel pipe periphery is provided with the folder hoop.
CN2010101571505A 2010-05-06 2010-05-06 Sensing device used for monitoring pulverized coal concentration Expired - Fee Related CN101876644B (en)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107632212B (en) * 2015-12-25 2020-09-04 北京东方计量测试研究所 Powder static real-time supervision ware
CN105699447A (en) * 2016-03-14 2016-06-22 哈尔滨理工大学 Measuring method for water content of cast green clay sand
CN108398465A (en) * 2018-01-31 2018-08-14 北京航空航天大学 A kind of high-voltage capacitance sensor array

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CN87212927U (en) * 1987-09-01 1988-04-06 西安交通大学 Condensor type instrument for measuring density of coal powder
CN101477074A (en) * 2008-11-06 2009-07-08 东北大学 Two-phase flow parameter monitoring method and system
CN201382793Y (en) * 2009-04-15 2010-01-13 姚贤卿 Differential capacitance target flow transducer

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JP2006136857A (en) * 2004-11-15 2006-06-01 Univ Nihon Fluidized bed apparatus and method for treating particle

Patent Citations (3)

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Publication number Priority date Publication date Assignee Title
CN87212927U (en) * 1987-09-01 1988-04-06 西安交通大学 Condensor type instrument for measuring density of coal powder
CN101477074A (en) * 2008-11-06 2009-07-08 东北大学 Two-phase flow parameter monitoring method and system
CN201382793Y (en) * 2009-04-15 2010-01-13 姚贤卿 Differential capacitance target flow transducer

Non-Patent Citations (4)

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段泉圣等.电容式煤粉浓度传感器的实验研究.《动力工程》.2007,第27卷(第2期),第204-206,272页. *
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