1、| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | BRITISH STANDARD BS 7871 : Part 2 : 1998 I
2、CS 01.040.53; 53.040.30 NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAW Pneumatic conveying Part 2. Glossary of equipmentBS 7871 : Part 2 : 1998 This British Standard, having been prepared under the direction of the Engineering Sector Board, was published under the authority o
3、f the Standards Board and comes into effect on 15 January 1998 BSI 1998 The following BSI references relate to the work on this standard: Committee reference MHE/9/-/1 Draft for comment 97/706943 DC ISBN 0 580 28629 0 Amendments issued since publication Amd. No. Date Text affected Committees respons
4、ible for this British Standard The preparation of this British Standard was entrusted by Technical Committee MHE/9, Continuous mechanical handling equipment, to Technical Committee MHE/9/-/1, Pneumatic conveying, upon which the following bodies were represented: British Coal Corporation Health and S
5、afety Executive Solids Handling and Processing Association Ltd. Co-opted membersBS 7871 : Part 2 : 1998 BSI 1998 i Foreword This Part of BS 7871 has been prepared by Technical Committee MHE/9. It is one of a series of standards being prepared on the subject of pneumatic conveying. The other publishe
6、d Part of this standard is: Part 1: Pneumatic conveying Glossary of terms Summary of pages This document comprises a front cover, an inside front cover, pages i and ii, pages 1 to 14, an inside back cover and a back cover.ii blankBS 7871 : Part 2 : 1998 BSI 1998 1 Section 1. Air and gas movers 1.1 C
7、ompressors No. Terms and definitions Figures 1101 reciprocating compressor Compressor with one or more pistons moving in cyclinders to compress gas and eject it at a higher pressure. 1102 screw type compressor Rotary compressor with left hand and right hand screws in close engagement, which entrain
8、the gas and eject it at a higher pressure. 1103 multi-vane compressor Rotary compressor with sliding vanes capable of creating a positive pressure at the outlet.2 BSI 1998 BS 7871 : Part 2 : 1998 Section 1 1.2 Blowers/exhausters No. Terms and definitions Figures 1201 roots type blower/exhauster Posi
9、tive displacement machine with synchronized lobed rotors in a housing, creating either a partial vacuum at the inlet, a pressure at the outlet, or both. 1202 multi-vane rotary blower/exhauster Rotary machine with sliding vanes in the rotor to create a partial vacuum at the inlet and a positive press
10、ure at the outlet. 1203 liquid ring- blower/exhauster Multi-bladed rotor in an elliptical housing partially filled with liquid, which forms a seal. 1204 regenerative blower/exhauster side channel blower/exhauster Externally vaned rotor, which rotates at high speed within an internally vaned housing.
11、 Gas entering spirals alternately between rotor and stator vanes and increases in pressure until it discharges through the outlet.Section 1 BS 7871 : Part 2 : 1998 BSI 1998 3 No. Terms and definitions Figures 1205 multi-stage turbo blower/exhauster Combination of rotors and stators designed to produ
12、ce levels of vacuum or positive pressure depending upon the number of stages. 1.3 Fans No. Terms and definitions Figures 1301 centrifugal fan Multi-bladed fan in a shaped housing, arranged to pump gas at relatively low pressure or vacuum. 1302 axial fan One or more multi-bladed impellers in a pipe o
13、r duct, normally direct- coupled axially and capable of pumping large quantities of gas at very low pressure or vacuum.4 BSI 1998 BS 7871 : Part 2 : 1998 Section 1 1.4 Other gas movers No. Terms and definitions Figures 1401 annular ejector/jet pump Device which provides large volume, positive or neg
14、ative low pressure gas flow using smaller volume higher pressure supply of motive gas. Motive gas is introduced around the periphery of the induced flow. 1402 axial ejector/jet pump Device which provides large volume, positive or negative low pressure gas flow using smaller volume, higher pressure s
15、upply of motive gas. Motive gas is introduced axially. 1403 coanda effect jet pump Device which provides large volume, positive or negative low pressure gas flow using smaller volume higher pressure supply of motive gas. Motive gas uses the coanda effect to direct the induced flow.BS 7871 : Part 2 :
16、 1998 BSI 1998 5 Section 2. Pipeline feeders 2.1 Rotary valves No. Terms and definitions Figures 2101 drop through rotary valve Rotary device to meter the material into a system whilst controlling the gas leakage through the valve. NOTE. The blades may be of helix form. 2102 off-set rotary valve Rot
17、ary device to meter the material into a system, typically used for large particulate materials to reduce cutting of particles. 2103 blow through rotary valve blowing seal Rotary device arranged to discharge material into the conveying pipe as the rotor blades pass the lowest position with the gas fl
18、owing through the rotor pocket. It is typically used for cohesive materials.6 BSI 1998 BS 7871 : Part 2 : 1998 Section 2 No. Terms and definitions Figures 2104 vertical axis rotary valve Rotary device with vertical drive shaft to meter material into a system whilst limiting gas leakage through the v
19、alve. 2.2 Flap valves No. Terms and definitions Figures 2201 counter-weighted flap valve Valve to control the in-flow of material and the out-flow of gas. 2202 double flap valve Upper and lower valves with alternating operation, to give almost continuous flow of material without reverse flow of gas.
20、Section 2 BS 7871 : Part 2 : 1998 BSI 1998 7 2.3 Other feeders No. Terms and definitions Figures 2301 pressure screw feeder screw pump Feeder used in positive pressure systems. It compacts the material to form a seal against line pressure. NOTE. This feeder is only suitable for fine materials. 2302
21、positive displacement feeder solids pump Feeder used in positive pressure systems. The seal is made by contact between the rotor and stator. NOTE. This feeder is only suitable for fine materials. 2303 double diaphragm pump Combined air mover and feeder in the form of a mechanical reciprocating pump
22、which handles both material and gas. NOTE. This feeder is only suitable for fine materials which can be readily fluidized.8 BSI 1998 BS 7871 : Part 2 : 1998 Section 2 2.4 Feed vessels, blow tanks (pressurized feed vessels) No. Terms and definitions Figures 2401 bottom discharge tank Single tank for
23、batch operation. Material is discharged downwards by pressurization of the tank with air or gas. NOTE. Allows complete emptying. 2402 top discharge tank Single tank for batch operation. Material is discharged upwards in a vertical or inclined pipe by pressurization of the tank with air or gas. NOTE.
24、 Some material tends to remain in the tank after discharge. 2403 continuous discharge tank, series arrangement Two tanks arranged so that the first tank discharges, in batches, to the second, which discharges continuously into the conveying line. NOTE. Top or bottom discharge can be used.Section 2 B
25、S 7871 : Part 2 : 1998 BSI 1998 9 No. Terms and definitions Figures 2404 twin tanks, parallel arrangement Arrangement in which two tanks fill and discharge alternately, giving near continuous discharge into the conveying line. NOTE. Top or bottom discharge can be used. 2.5 Other entrainment devices
26、No. Terms and definitions Figures 2501 venturi feeder or eductor Feeder used for introducing material into systems working above atmospheric pressure. High gas velocity decreases the pressure in order to draw material into the throat whilst preventing the leakage of air or gas. 2502 suction nozzle F
27、eeder used for introducing material into systems working below atmospheric pressure. It is mainly used to reclaim material from a pile or where the top surface of material is accessible.10 BSI 1998 BS 7871 : Part 2 : 1998 1) Can be manufactured or lined with materials different to the pipeline to co
28、unter wear. Section 3. Transfer equipment No. Terms and definitions Figures 3001 elbow 1) Section of pipe incorporated into the transfer line to change the direction of flow. The ratio r/D is typically 2. 3002 short radius bend 1) Section of pipe incorporated into the transfer line to change the dir
29、ection of flow. The ratio r/D is typically in the range 2 to 6. 3003 long radius bend 1) Section of pipe incorporated into the tranfer line to change the direction of flow. The ratio r/D is typically greater than 6. 3004 blind tee bend 1) Section of pipe incorporated into the transfer line to change
30、 the direction of flow. NOTE. This device gives some wear resistance but has a greater pressure loss.Section 3 BS 7871 : Part 2 : 1998 BSI 1998 11 No. Terms and definitions Figures 3005 wear back bend A pipe similar to a radius bend, but incorporating reinforcement along the back of the bend to coun
31、ter wear. There are numerous ways in which this reinforcement can be applied. 3006 conveying line gas injectors Series of gas injectors placed at intervals along the conveying pipe for the purpose of injecting additional gas to assist conveying in certain specialist applications. 3007 internal gas b
32、y-pass pipe Lengths of perforated gas pipe incorporated within the main pipe to assist conveying in certain specialist applications. 3008 flow splitter Device which divides the flow into a number of alternative conveying lines simultaneously. NOTE. There are many types as well as the one shown. 3009
33、 flow diverter Device in which the material flow in a conveying line can be diverted from one line into an alternative line. NOTE. There are many types as well as the one shown.12 BSI 1998 BS 7871 : Part 2 : 1998 Section 4. Gas/material separators No. Terms and definitions Figures 4001 filter Device
34、 which uses porous material to separate solid particles from the gas after initial separation in the vessel. 4002 cyclone Device to impart rotary motion to the gas stream thereby causing the entrained particles of material to be separated by centrifugal force and gravity. 4003 tipper seal Reciprocat
35、ing device for discharging material from a receiver of hopper without breaking down the vacuum.Section 4 BS 7871 : Part 2 : 1998 BSI 1998 13 No. Terms and definitions Figures 4004 precipitator Separating device which operates by charging fine particles of material and attracting them to collecting e
36、lectrodes. The collecting electrodes are cleaned by rapping and material falls into a collecting hopper. 4005 wet scrubber Device which washes gas with a spray or sheet of liquid (usually water) to entrap particulates and fumes in the liquid. NOTE. The figure shows the simplest open type where water
37、 sprayed into the venturi induces the gas to flow into the scrubbing section. Many other types are available including types with mechanical arrangements for eliminating liquid mist from the exhaust gases.BS 7871 : Part 2 : 1998 14 BSI 1998 Index annular ejector 1401 axial ejector 1402 axial fan 130
38、2 blind tee bend 3004 blow through rotary valve 2103 blowers/exhausters liquid ring blower/exhauster 1203 multi-stage turbo blower/exhauster 1205 multi-vane rotary blower/exhauster 1202 regenerative blower 1204 roots type blower/exhauster 1201 bottom discharge tank 2401 centrifugal fan 1301 coanda e
39、ffect jet pump 1403 compressors multi-vane compressor 1103 reciprocating compressor 1101 screw type compressor 1102 continuous discharge tank, series arrangement 2403 conveying line gas injectors 3006 counter-weighted flap valve 2201 cyclone 4002 double diaphragm pump 2303 double flap valve 2202 dro
40、p through rotary valve 2101 eductor 2501 elbow 3001 fans axial fan 1302 centrifugal fan 1301 feed vessels bottom discharge tank 2401 continuous discharge tank, series arrangement 2403 top discharge tank 2402 twin tanks, parallel arrangement 2404 feeders pressure screw feeder 2301 positive displaceme
41、nt feeder 2302 double diaphragm pump 2303 filter 4001 flap valves counter-weighted flap valve 2201 double flap valve 2202 flow diverter 3009 flow splitter 3008 internal gas by-pass pipe 3007 jet pumps annular ejector/jet pump 1401 axial ejector/jet pump 1402 coanda effect jet pump 1403 liquid ring-b
42、lower/exhauster 1203 long radius bend 3003 multi-stage turbo blower/exhauster 1205 multi-vane compressor 1103 off-set rotary valve 2102 parallel or twin tanks 2404 positive displacement feeder or solids pump 2302 precipitator 4004 pressure screw feeder or screw pump 2301 reciprocating compressor 110
43、1 regenerative or side channel blower 1204 roots type blower/exhauster 1201 rotary valves blow through rotary valve 2103 drop through rotary valve 2101 off-set rotary valve 2102 vertical axis rotary valve 2104 screw pump 2301 screw type compressor 1102 series twin tanks 2403 short radius bend 3002 s
44、ide channel blower 1204 solids pump 2302 straight pipe 3001 suction nozzle 2502 tipper seal 4003 top discharge tank 2402 twin tanks, parallel arrangement 2404 venturi feeder or eductor 2501 vertical axis rotating valve 2104 wear back bend 3005 wet scrubber 4005blankBSI 389 Chiswick High Road London
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