GB1238281A - - Google Patents

Info

Publication number
GB1238281A
GB1238281A GB4154267A GB1238281DA GB1238281A GB 1238281 A GB1238281 A GB 1238281A GB 4154267 A GB4154267 A GB 4154267A GB 1238281D A GB1238281D A GB 1238281DA GB 1238281 A GB1238281 A GB 1238281A
Authority
GB
United Kingdom
Prior art keywords
air
duct
flow
ratio
rate
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
GB4154267A
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed filed Critical
Publication of GB1238281A publication Critical patent/GB1238281A/en
Expired legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
    • G01F1/00—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow
    • G01F1/56—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using electric or magnetic effects
    • G01F1/64—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using electric or magnetic effects by measuring electrical currents passing through the fluid flow; measuring electrical potential generated by the fluid flow, e.g. by electrochemical, contact or friction effects
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65G—TRANSPORT OR STORAGE DEVICES, e.g. CONVEYORS FOR LOADING OR TIPPING, SHOP CONVEYOR SYSTEMS OR PNEUMATIC TUBE CONVEYORS
    • B65G53/00—Conveying materials in bulk through troughs, pipes or tubes by floating the materials or by flow of gas, liquid or foam
    • B65G53/34—Details
    • B65G53/66—Use of indicator or control devices, e.g. for controlling gas pressure, for controlling proportions of material and gas, for indicating or preventing jamming of material
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
    • G01F1/00—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow
    • G01F1/704—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow using marked regions or existing inhomogeneities within the fluid stream, e.g. statistically occurring variations in a fluid parameter
    • G01F1/708—Measuring the time taken to traverse a fixed distance
    • G01F1/7088—Measuring the time taken to traverse a fixed distance using electrically charged particles as tracers

Landscapes

  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • General Physics & Mathematics (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Measuring Volume Flow (AREA)

Abstract

1,238,281. Measuring particle size electrically. BABCOCK & WILCOX Ltd. Sept.12, 1968 [Sept.12, 1967], No.41542/67. Heading G1N. Apparatus to measure the mass flow-rate of a suspension of particles of pulverized fuel in air being supplied to a burner through a duct, 1, comprises two annular electrode assemblies mounted longitudinally of the duct and spaced apart along a Venturi construction formed by a circularly symmetrical member 6 tapered at each end and mounted co-axially of the duct a potential difference of about 4500 volts being maintained between the electrodes Figs.2 and 3 (not shown), the downstream assembly is maintained at earth potential and a microammeter is connected to the assemblies to measure the current flowing between them. Pressure tapping points 10, 11, 12, are in the duct wall. The pressure drop dp 1 between the points 10 and 12 is proportional to the air-flow, whilst the ratio of the pressure drop dp 2 , between points 10 and 11, to that dp 1 determines the solids loading of the air-stream (i.e. the ratio by weight of fuel to air). The mass flow-rate of particles through the construction is the product of air-flow and solids loading. Each electrode of the upstream assembly lies in the same diametral plane as an electrode of the downstream assembly and each is of aerofoil section (20) Figs.4, 5 (not shown). Each of the electrodes of the upstream assembly has a stainless steel knife-edge strip (21) set into its downstream edge which strip facilitates the initiation of a corona discharge which will charge the particles flowing past the strip. It is stated that the particle size is proportional to the ratio of this current flow to the mass flow-rate. The measured values may be utilized to control the flowrates by means of an air inlet duct control valve 2a and fuel fed control device 4a.
GB4154267A 1967-09-12 1967-09-12 Expired GB1238281A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB4154267 1967-09-12

Publications (1)

Publication Number Publication Date
GB1238281A true GB1238281A (en) 1971-07-07

Family

ID=10420186

Family Applications (1)

Application Number Title Priority Date Filing Date
GB4154267A Expired GB1238281A (en) 1967-09-12 1967-09-12

Country Status (5)

Country Link
BE (1) BE720747A (en)
DK (1) DK123263B (en)
FR (1) FR1579432A (en)
GB (1) GB1238281A (en)
NL (1) NL6813051A (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4380202A (en) * 1981-01-14 1983-04-19 The Babcock & Wilcox Company Mixer for dual register burner

Also Published As

Publication number Publication date
DK123263B (en) 1972-05-29
NL6813051A (en) 1969-03-14
BE720747A (en) 1969-02-17
FR1579432A (en) 1969-08-22

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Legal Events

Date Code Title Description
PS Patent sealed [section 19, patents act 1949]
PLNP Patent lapsed through nonpayment of renewal fees