CN103543227B - Sampling evaporator comprising automatic replacement device and used for low-pressure liquefied gas inspection - Google Patents
Sampling evaporator comprising automatic replacement device and used for low-pressure liquefied gas inspection Download PDFInfo
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- CN103543227B CN103543227B CN201310514272.9A CN201310514272A CN103543227B CN 103543227 B CN103543227 B CN 103543227B CN 201310514272 A CN201310514272 A CN 201310514272A CN 103543227 B CN103543227 B CN 103543227B
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Abstract
The invention relates to a sampling evaporator comprising an automatic replacement device and used for low-pressure liquefied gas inspection. By the design of the automatic replacement device, residual gas-phase liquefied gas can be discharged out of the sampling evaporator through an analysis gap of a chromatographic instrument, and the detection preparation time is shortened; a sample can be continuously analyzed by the gas-phase chromatographic instrument, and the utilization rate of the gas-phase chromatographic instrument is greatly improved.
Description
Technical field
The present invention relates to a kind of low pressure liquefied gas and the mixed gas detection sample making apparatus of chemical field, be specifically related to a kind of low pressure liquefied gas that contains automatic replacing device and mixed gas inspection sample introduction evaporator, check for low pressure liquefied gas and mixed gas (as propylene, propane, dimethyl ether, hydrogen bromide, ammonia, liquefied petroleum gas (LPG) etc.) sample making apparatus that is converted to unsaturation gas phase media (being superheated vapor) by liquid phase.
Background technology
Low pressure liquefied gas and mixed gas have been widely used in the various aspects of producing and living now, because different environments for use requires different to the component of low pressure liquefied gas and mixed gas, the component of measuring quickly and accurately low pressure liquefied gas and mixed gas just seems very necessary, and the component of accurate Fast Measurement low pressure liquefied gas and mixed gas will be gasified totally liquid low pressure liquefied gas and mixed gas into normal pressure or pressure-fired unsaturation gaseous state low pressure liquefied gas and mixed gas first exactly again.Existing gasifying process is generally coil pipe heated type, modified changes coil pipe heated type into capillary heating formula (as flash distillation instrument etc.), these vaporising devices are all to design with reference to the gasifying process of SH/T 0230-1992 " liquefied petroleum gas (LPG) composition measuring method (chromatography) ", there is length consuming time in the given gasifying process of SH/T 0230-1992 " liquefied petroleum gas (LPG) composition measuring method (chromatography) ", valve section and input sample introduction section are heated without thermal source, valve section dewfall is serious, make C5 component gasification difficulty, sample introduction section liquefies again, make sample introduction component occur fluctuation, cause repeatability error large, check data distortion.Same sample reproducibility error is the highest has exceeded 30%, is the inaccurate project of typical inspection, and changes sample and clean displacement inconvenience, the liquefied petroleum gas (LPG) amount of diffusing is large, cause hidden fire-fighting danger to increase, also make laboratory air ambient be polluted, the method is stopped using in inspection body substantially at present simultaneously.Thereafter domestic and international each scientific research institution has researched and developed the various ways gasification instrument including flash distillation instrument, still can not solve the inaccurate problem of inspection completely.By understanding domestic and international advanced achievement in research, actively consult expert, consistent for solving sample gasification front and back chemical composition, the pipeline sample of avoiding gasifying is residual, guarantee the difficult problem such as accuracy and repeatability of testing result, design and there is atmospheric equilibrium water conservancy diversion evaporator, effectively ensured accuracy and the repeatability of instrument testing data.
Summary of the invention
The embodiment of the invention discloses a kind of low pressure liquefied gas inspection that contains automatic replacing device and use sample introduction evaporator, it should be noted that, in the situation that not conflicting, the technical characterictic in embodiment and embodiment in the application can mutually combine.
The invention provides a kind of low pressure liquefied gas inspection sample introduction evaporator that contains automatic replacing device, comprise a liquid phase egg that obtains liquid phase medium sample and one contain automatic replacing device by sample gasification and provide the gas phase egg of gas phase media sample to testing instruments, and corresponding constant temperature, constant voltage, displacement, required control system and power system and the corresponding control program software of clean maintenance corresponding functional unit.
The position of described displacement job control program element control piston assembly in cylinder assembly and unlatching are supplied gas and are regulated carrier gas input solenoid valve in displacement combination valve, realize piston upper chamber, supply gas regulate displacement combination valve, supplying gas regulates medium in displacement combination valve and piston upper chamber communicating pipe, gas phase media fluid flow with heat tracing pipe, quantitative sample injection six-way valve, quantitative sample injection six-way valve quantity tube to discharge and suck substitution gas, reduces medium residual quantity in above-mentioned medium cavity volume and reach the function of accuracy of detection requirement.
Described automatic replacing device is to be controlled on drive plate and respectively carried out components and parts automatic replacing device by piston assembly by programmable logic controller (PLC) PLC or micro-control unit MCU operation at each program element, oilless air compressor, upper end cover, cylinder assembly, low head, liquid phase egg input gas phase egg experimental liquid phase medium entrance, displacement Abgasabsaugung hole, supply gas and regulate displacement combination valve, supply gas and regulate displacement combination valve substitution gas delivery pipe, displacement carrier gas input pipe, Self-closing lock displacement gas piping joint, supply gas and regulate displacement combination valve and piston upper chamber communicating pipe, gas phase media fluid flow with heat tracing pipe, quantitative sample injection six-way valve, quantitative sample injection six-way valve quantity tube, spinner-type flowmeter, discarded gas phase media delivery pipe, waste air setting pneumatics flexible pipe, displacement exhaust emission tube composition.
Described oilless air compressor is arranged on the position of the lower-left face of described cylinder assembly, described supply gas regulate displacement combination valve be arranged on described cylinder assembly above, described piston assembly is arranged on the inside of described cylinder assembly, described upper end cover is arranged on the upper end of described cylinder assembly, described low head is arranged on the lower end of described cylinder assembly, is provided with described liquid phase egg input gas phase egg experimental liquid phase medium entrance and described displacement Abgasabsaugung hole on described upper end cover; Described displacement is connected to described Self-closing lock displacement gas piping joint with carrier gas input pipe, described in described Self-closing lock displacement gas piping joint connects by the described adjusting displacement combination valve substitution gas delivery pipe of supplying gas, supply gas and regulate displacement combination valve, described supplying gas regulates displacement combination valve one end to connect described gas phase media fluid flow with heat tracing pipe, described in the other end connects, supply gas and regulate displacement combination valve and described piston upper chamber communicating pipe, described quantitative sample injection six-way valve is connected described gas phase media fluid flow with heat tracing pipe with described quantitative sample injection six-way valve quantity tube; Described quantitative sample injection six-way valve is connected to described discarded gas phase media delivery pipe through described spinner-type flowmeter; Described discarded gas phase media delivery pipe is connected to described waste air setting pneumatics flexible pipe, is then communicated with described displacement exhaust emission tube.Described control system is made up of mainboard, drive plate, touch screen human-computer interface and relevant pressure, temperature, time, range sensor; Described control program software package overlaps program element composition containing temperature control, pressure medium control, displacement work, clean maintenance, sample introduction work, manual operation six, and each program element is controlled each components and parts of carrying out on drive plate by programmable logic controller (PLC) PLC or micro-control unit MCU operation.
The described low pressure liquefied gas inspection sample introduction evaporator that contains automatic replacing device, piston upper chamber substitute mode is: control system instruction switch valve with two-position and five-pass by oilless (oil free) compressor porting follow procedure circulating picture-changing to, oilless (oil free) compressor is to piston cavity of resorption circulation output positive and negative pressure, upstroke when input malleation, descent of piston when input negative pressure, up-downgoing stop is by PLC or MCU controlling run; Replace by piston up-down, up Exhaust Gas is siphoned away by oil-free air compressor, descending inhale fresh air; Piston movement is during to top dead centre, piston upper chamber volume is less than 1ml, when piston movement arrives lower dead center, piston upper chamber volume is greater than 1300ml, the upper and lower shuttling movement of piston once, residual gas is only after a upper circulation after 7.7/10000ths, three times of gas circulations, to be only 4.6/1000000000ths before displacement, can meet and adopt coulometry and chromatography to liquid gas sulphur content determination class ppm level analysis displacement requirement.
The described low pressure liquefied gas inspection sample introduction evaporator that contains automatic replacing device, supply gas and regulate displacement combination valve, supply gas and regulate displacement combination valve and piston upper chamber communicating pipe, gas phase media fluid flow with heat tracing pipe, quantitative sample injection six-way valve, quantitative sample injection six-way valve quantity tube substitute mode is: synchronize and carry out with piston upper chamber displacement, control system instruction is supplied gas and is regulated carrier gas input solenoid valve in displacement combination valve to open, carrier gas enters in above-mentioned components and parts Delivery lumen is purged, purge time 3min, carrier gas flux is greater than 3000ml, 100 times of tube chamber volume 30ml, after displacement, must not detect ppm level medium residual quantity.
Described oil-free air compressor is Double-head, and a head is made vacuum pump for replacing Abgasabsaugung, and another head coordinates driven plunger to move up and down with two-position five-way positive/negative pressure cross-over valve.
Described descent of piston inhale fresh air is inputted by liquid phase egg input gas phase egg experimental liquid phase medium entrance.
Described displacement waste gas by discard gas phase media delivery pipe, displacement exhaust emission tube be delivered to safety dumping place.
Described liquid phase egg mainly by bleed valve, main valve valve rod handwheel, main valve valve rod, liquid phase eggshell body handwheel, liquid phase eggshell body, 2 to 5ml liquid phase medium storage chambeies and and bleed valve leakproof O shape circle, exhausting valve sealing surface O shape circle, main valve leakage preventing valve stem O shape circle, liquid in-out valve sealing surface O shape circle, liquid phase egg liquid in-out connecting anti-leak O shape circle form.
Described gas phase egg is by low head, heat conduction constant temperature aluminium cover, cylinder assembly, piston assembly, piston handling safety frame, piston temperature sensor, piston upper chamber, piston upper chamber digital pressure sensor, displacement carrier gas input pipe, gas phase media fluid flow with heat tracing pipe, supply gas and regulate displacement combination valve, supply gas and regulate displacement combination valve substitution gas delivery pipe, supply gas and regulate displacement combination valve and piston upper chamber communicating pipe, Self-closing lock displacement gas piping joint, piston upper chamber pressure transducer communicating pipe, displacement Abgasabsaugung hole, liquid phase egg input gas phase egg experimental liquid phase medium entrance, upper end cover, piston actuated power is taken out the body of calming the anger and is taken over, piston cavity of resorption, in piston cavity of resorption digital pressure sensor and gas phase egg, lead to atmosphere opening by atmospheric balancing device, concertina type pneumatics flexible pipe, concertina type pneumatics flexible pipe compresses elbow, gas collection annular groove between piston assembly upper-lower seal O shape circle, atmospheric equilibrium pipe piston cavity air guide channel, the atmospheric balancing device composition that the lower sub of atmospheric equilibrium pipe forms.
Adopt the beneficial effect of technique scheme: total consuming time short when the single gasification sample of sample introduction evaporator is used in the low pressure liquefied gas inspection that gas phase egg of the present invention contains automatic replacing device, recruitment is few; Sample consumption is few, is very easy to quality supervision department and carries out liquid gas pick test work, and laboratory environment and security have also obtained improving greatly.Gas phase egg of the present invention possesses automatic replacing function, utilizes the gap of detecting instrument analysis can realize remaining this evaporator of gas phase liquid gas discharge employing, reduces and detects setup time; And can realize the continuous analyzing samples of detecting instrument, greatly improve the utilization factor of detecting instrument.Because displacement precision must not reach and detected ppm level medium residual quantity, can meet and adopt coulometry and chromatography to liquid gas sulphur content determination class ppm class precision analysis displacement requirement.
Brief description of the drawings
Figure 1A evaporator is always schemed (gas phase egg and liquid phase egg combination outside drawing) structural drawing;
Figure 1B evaporator cap structure figure;
Fig. 2 gas phase egg structural drawing;
Fig. 3 A liquid phase egg spool is bevelled sealing surface structural drawing;
Fig. 3 B liquid phase egg spool is flat seal face structural drawing;
The view when sampling of Fig. 4 liquid phase egg;
Fig. 5 evaporator operation schematic diagram;
The input of Fig. 6 A. sample quantitatively encircles MEDIA FLOW to schematic diagram;
Fig. 6 B. carrier gas is brought quantitative ring sample medium incoming inspection instrument into and is flowed to schematic diagram;
Fig. 7 evaporator operation process flow diagram.
Embodiment
Parts Reference numeral is specified 1. supply socket 220VAC 10A
2. resettable fuse 240VAC 2A 33. replaces exhaust emission tube
3. drive plate 34. piston actuated power are taken out the body adapter of calming the anger
4. the logical atmosphere opening of direct supply DC19V 4.74A 35. atmospheric balancing devices
5. lifting motor 36. piston cavity of resorptions
6. 105 DEG C of 37. electrothermal tube of temperature detect switch (TDS) KSD301
7. heat conduction constant temperature aluminium overlaps 38. cylinder assemblies
8. heat conduction constant temperature aluminium sleeving temperature sensor 39. concertina type pneumatics flexible pipes
9. gas phase egg 40. concertina type pneumatics flexible pipes compress elbow
10. carrier gas input pipe 41. piston assemblies for displacement
11. piston upper chamber digital pressure sensor 42. piston lower seal
12. gas phase medias are accompanied hot gas piping 43. atmospheric equilibrium pipe piston cavity air guide channels
13. supply gas regulates O-ring seal on displacement combination valve 44. pistons
14. supply gas regulates displacement combination valve and piston upper chamber to connect 45. piston PTEE F4 to prevent from adsorbing O-ring seal siphunculus 46. piston handling safety framves
15. supply gas regulates displacement combination valve substitution gas to carry 47. piston temperature sensor tube 48. piston upper chambers
16. Self-closing lock displacement gas piping 49. piston upper chamber pressure transducer communicating pipes of joint
17. liquid phase eggs 50. are replaced Abgasabsaugung hole
18. waste air setting pneumatics flexible pipe 51. liquid phase egg input gas phase egg experimental liquid phase mediums enter
19. gas-holder digital pressure sensor mouths
20. mainboards (51 single-chip microcomputer), 52. upper end covers
21. touch screen human-computer interface 53. upper end cover O-ring seals
22. Self-closing lock displacement gas piping joints and gas-holder meet 54. upper end cover PTEE F4 and prevent from adsorbing O-ring seal pipe 55. upper end cover mount pads
23. gas-holder to two-position five-way reversing solenoid valve is taken over 56. gas phase egg mounting base plates
Between 24. gas-holder 57. piston assembly upper-lower seal O shape circles, gas is received
25.DS18B20 digital thermometer set of data lines annular groove
26. displacement waste gas tail pipe 58. atmospheric equilibrium pipe lower subs
27. oilless air compressor 59. low heads
28. two-position five-way positive/negative pressure cross-over valve 60. atmospheric equilibrium pipe lower sub O-ring seals
29.3kPa exhaust backpressure valve 61. bleed valves
30. piston cavity of resorption digital pressure sensor 62. main valve valve rod handwheels
31. the built-in AC220V power lead 63. main valve valve rods of cabinet
32. rocker type switch KCD3 AC250V 10A 64. bleed valve leakproof O shape circles
65. exhausting valve sealing surface O shape is enclosed 76. gas phase escape holes
66. liquid phase eggshell body handwheel 77. vent valves
67. liquid phase eggshell body 78. liquid in-out valve hand wheel bearing marks
68. main valve leakage preventing valve stem O shapes are enclosed the angle of 79. horizontal datums and liquid phase egg axis
69.2 to the 5ml discarded gas phase media delivery pipes in liquid phase medium storage chamber 80.
70. liquid in-out valve sealing surface O shape is enclosed 81. spinner-type flowmeters
71. liquid phase egg liquid in-out connecting anti-leak O shapes are enclosed 82. quantitative sample injection six-way valves
72. liquid gas quantitatively encircle for sample valve 83. quantitative sample injection six-way valves
73. aerosol container or pipeline 84. quantitative sample injection six-way valve carrier gas are taken over
74. liquid gas sampling liquid phase medium entrance 85. instrument sample introductions are taken over
75. liquid in-out valve 86. check analysis instruments
Below in conjunction with accompanying drawing, the present invention is further described, the invention provides a kind of low pressure liquefied gas inspection sample introduction evaporator that contains automatic replacing device as shown in Figure 1A, this evaporator comprises a liquid phase egg 17 that obtains liquid phase medium sample and one by sample gasification and the gas phase egg 9 of gas phase media sample is provided to testing instruments, and the required control system of the corresponding functional unit such as corresponding constant temperature, constant voltage, displacement, clean maintenance and power system and corresponding control program software form;
Control system is made up of mainboard 20, drive plate 3, touch screen human-computer interface 21, temperature, pressure, electric current, move distance, timing sensor and default each cell operation time, temperature, distance, voltage, current data.Wherein touch screen human-computer interface 21 is responsible for showing the every work information of evaporator, enters the operating instructions; Mainboard 20 is responsible for processing by blas the work information that each sensor is sent, and drive plate 3 is sent to execution instruction; Each operating unit work is opened or is closed in instruction that drive plate 3 sends by mainboard 20, heats, opens the instruction that oilless air compressor 27 and two-position five-way positive/negative pressure cross-over valve binding time parameter control piston assembly 41 send by mainboard 20 in cylinder assembly 38 and do functional exercise as opened electrothermal tube 37.
Control program software package overlaps program element composition containing temperature control, pressure medium control, displacement work, clean maintenance, sample introduction work, manual operation six, on touch screen human-computer interface, show with submenu, each program element is controlled each components and parts of carrying out on drive plate 3 by programmable logic controller (PLC) (PLC) or micro-control unit (MCU) operation, reaches intelligent gasification sample medium and carries the functions such as oneself gasification sample medium.Temperature control program unit controls piston upper chamber 48, piston cavity of resorption 36 temperature, make gasification temperature within the scope of input design temperature; The position of pressure medium control program unit controls piston assembly 41 in cylinder assembly 38, realizes the function that the interior pressure medium of piston upper chamber 48 is increased or reduced pressure medium; The position of displacement job control program element control piston assembly 41 in cylinder assembly 38, realizes substitution gas is discharged and sucked to the interior medium of piston upper chamber 48, reduces the function of the residual quantity of medium in piston upper chamber 48; Clean maintenance control program unit controls piston handling safety frame 46 protects upper end cover 52 and piston assembly 41 in cylinder assembly 38, to rise to setting height cylinder assembly 38, and handled easily personnel clean maintenance and change the work of sealing components and parts upper end cover 52 and piston assembly 41; Sample introduction job control program element control piston handling safety frame 46, upper end cover 52 and piston assembly 41 are reset to sample introduction state position control gasification and gas phase media and carry whole temperature, pressure parameter in range of set value; Manual operation control program unit can be inputted instruction by touch screen human-computer interface 21 and complete evaporator and all set working routine.
Power system is by supply socket 220VAC 10A1, resettable fuse 240VAC 2A2, the built-in AC220V power lead 31 of cabinet, rocker type switch KCD3 AC250V 10A32, direct supply DC19V 4.74A4, heat conduction constant temperature aluminium cover 7, lifting motor 5, gas-holder 24, ZTP82 oil-free air compressor 27, Double-head, one of them head is made vacuum pump for replacing Abgasabsaugung, and another head coordinates driven plunger to move up and down with two-position five-way positive/negative pressure cross-over valve 28, two-position five-way positive/negative pressure cross-over valve 28, 3kPa exhaust backpressure valve 29, supply gas and regulate displacement combination valve 13, drive plate 3, piston actuated power is taken out calm the anger body adapter 34 and power gas pipeline displacement carrier gas input pipe 10, waste air setting pneumatics flexible pipe 18, Self-closing lock displacement gas piping joint and gas-holder take over 22, gas-holder to two-position five-way reversing solenoid valve takes over 23, displacement waste gas tail pipe 26, displacement exhaust emission tube 33 and the adjusting displacement combination valve 13 of supplying gas, two-position five-way positive/negative pressure cross-over valve 28 forms.Wherein in constant temperature aluminium cover 7, contain electrothermal tube 37.Wherein AC220V AC power is to evaporator power supply general supply, rocker type switch 32 is controlled its break-makes, and on drive plate 3, electrothermal tube 37 relays, oilless air compressor 27 relays are directly inputted AC220V alternating current by rocker type switch 32 and driven electrothermal tube 37, oilless air compressor 27 to work; Direct supply DC19V4.74A4 the rear access of rocker type switch 32 AC220V AC power be converted to DC19V power supply to lifting motor 5 control circuits in by mainboard 20 and drive plate 3, gas phase media fluid flow with heat tracing pipe/supplying gas regulates displacement combination valve 13 to accompany electrothermal relay, 3kPa exhaust backpressure valve 29 relays, the 28 relays power supplies of two-position five-way positive/negative pressure cross-over valve, mainboard 20 is to temperature sensor and pressure transducer power supply; Temperature sensor comprises heat conduction constant temperature aluminium sleeving temperature sensor 8 and piston temperature sensor 47; Pressure transducer comprises piston upper chamber digital pressure sensor 11, gas-holder digital pressure sensor 19 and piston cavity of resorption digital pressure sensor 30; Gas-holder 24 obtains compressed carrier gas, take over 23 by gas-holder to two-position five-way reversing solenoid valve and be delivered to two-position five-way positive/negative pressure cross-over valve 28, the instruction that solenoid valve sends by mainboard 20 under coordinating in two-position five-way positive/negative pressure cross-over valve 28 promotes two-position five-way positive/negative pressure cross-over valve 28 cross-over valves gas return path is commutated.
Be provided with piston upper chamber digital pressure sensor 11 and supply gas in the top cover place of evaporator of the present invention one side as shown in Figure 1B and regulate displacement combination valve 13, supply gas and regulate displacement combination valve 13 and displacement carrier gas input pipe 10, gas phase media is accompanied hot gas piping 12 and piston upper chamber communicating pipe 14 and is connected, liquid phase egg 17 is arranged on the centre of evaporator, gas phase egg 9 is arranged on the position on the left side of the inner liquid phase egg of evaporator, and touch screen human-computer interface 21 is arranged on the opposite side of evaporator.
Gas phase egg is by low head 59 as shown in Figure 2, atmospheric balancing device, heat conduction constant temperature aluminium cover 7, cylinder assembly 38, piston assembly 41, piston handling safety frame 46, containing lifting nut guide pole, gas phase egg mounting base plate 56, upper end cover mount pad 55, piston temperature sensor 47, piston upper chamber 48, piston upper chamber digital pressure sensor 11, carrier gas input pipe 10 for displacement, gas phase media fluid flow with heat tracing pipe 12, supply gas and regulate displacement combination valve 13, supply gas and regulate displacement combination valve substitution gas delivery pipe 15, supply gas and regulate displacement combination valve and piston upper chamber communicating pipe 14, Self-closing lock displacement gas piping joint 16, piston upper chamber pressure transducer communicating pipe 49, displacement Abgasabsaugung hole 50, liquid phase egg input gas phase egg experimental liquid phase medium entrance 51, upper end cover 52, piston actuated power is taken out the body of calming the anger and is taken over 34, piston cavity of resorption 36, piston cavity of resorption digital pressure sensor 30 forms.
In gas phase egg, compress gas collection annular groove, atmospheric equilibrium pipe piston cavity air guide channel 43, atmospheric equilibrium pipe lower sub 58 between elbow 40, piston assembly 41 upper-lower seal O shape circles by the logical atmosphere opening 35 of atmospheric balancing device, concertina type pneumatics flexible pipe 39, concertina type pneumatics flexible pipe and form atmospheric balancing device.
As preferably, the servo-actuated transfiguration pressure reduction space abbreviation of gas phase egg 9 piston piston upper chamber 48 is made up of upper end cover 52, cylinder assembly 38, piston assembly 41 as shown in Figure 2, form the rear low pressure liquefied gas of 3～10kPa pressure-fired gasification and mixed gas steam cavity volume, liner all adopts the anti-absorbent coating of PTFE F4.The pressure-fired of the servo-actuated transfiguration pressure reduction space of piston of gas phase egg is that piston upper chamber digital pressure sensor 11 and piston temperature sensor 47 and heat conduction constant temperature aluminium sleeving temperature sensor 8 feed back to mainboard 20 described in main plate center control and adjust by described pressure medium sensor.Promote piston assembly 41 in the servo-actuated decompression process medium of gas phase egg piston vapour pressure descending, the expansion of cavity volume volume causes vapor pressure to decline, until vapor pressure drops to and piston movement resistance balance (piston resistance is only the friction force of piston and inboard wall of cylinder block), now vapor pressure drops to 3～10kPa pressure-fired, the optimum pressure of the conveying that this pressure is gas phase media.If pressure is not within the scope of this, pressure medium sensor is that data are reached evaporator mainboard PLC by piston upper chamber digital pressure sensor 11 or MCU starts constant-voltage system adjusting pressure automatically, in the time that pressure medium is greater than 10kPa, to piston cavity of resorption, 36 decompressions make piston assembly 41 descending; In the time that pressure medium is less than 3kPa, to piston cavity of resorption, 36 superchargings make piston assembly up; Until in pressure 3～10kPa pressure-fired of gas phase media.Gas phase egg piston cavity of resorption 36 is made up of low head 59, cylinder assembly 38, piston assembly 41, atmospheric balancing device.
Liquid phase egg is mainly mainly made up of bleed valve 61, main valve valve rod handwheel 62, main valve valve rod 63, liquid phase eggshell body handwheel 66, liquid phase eggshell body 67,2 to 5ml liquid phase medium storage chamber 69 and bleed valve leakproof O shape circle 64, exhausting valve sealing surface O shape circle 65, main valve leakage preventing valve stem O shape circle 68, liquid in-out valve sealing surface O shape circle 70, liquid phase egg liquid in-out connecting anti-leak O shape circle 71 liquid phase egg 17 as shown in Figure 3.Wherein main valve valve rod 63 upper valve bases and bleed valve 61 upper valve cores form liquid phase egg gas phase delivery stop valves referred to as vent valve 77, liquid phase medium are closed in 2 to 5ml liquid phase medium storage chambeies 69 after ensureing to be full of liquid phase medium in 2 to 5ml liquid phase medium storage chambeies 69; On liquid phase eggshell body 67 upper valve bases and main valve valve rod 63, core forms liquid phase egg liquid phase turnover stop valve and is called for short liquid in-out valve, liquid phase medium is closed in 2 to 5ml liquid phase medium storage chambeies 69 after ensureing to be full of liquid phase medium in 2 to 5ml liquid phase medium storage chambeies 69; The enclosure space that liquid phase eggshell body 67, main valve valve rod 63, bleed valve 61 form forms 2 to 5ml liquid phase medium storage chambeies 69, liquid phase egg is possessed and quantitatively obtain liquid phase medium sample the function to gas phase egg input liquid phase medium sample.The function of liquid phase egg for obtain approximately 2 to 5ml liquid phase low pressure liquefied gas and mixture gas medium as injecting gas phase egg gasification sample, according to the difference of expansion coefficient and test samples operational throughput after medium gasification, select the liquid phase egg of corresponding capacity.Fig. 3 A is that liquid phase egg spool is bevelled sealing surface structural drawing, and Fig. 3 B is that liquid phase egg spool is flat seal face structural drawing.
When the present invention operates, as shown in Figure 4 liquid phase egg 17 is contained in to aerosol container or pipeline 73 on sample valve 72, liquid phase egg axis is spent angles for 79 one-tenth 0～15 with the angle of horizontal datum, open for sample valve 72, low pressure liquefied gas and mixed gas, entering from liquid gas sampling liquid phase medium entrance 74, start sampling.First hold liquid phase eggshell body handwheel 66 and be rotated counterclockwise main valve valve rod handwheel 62 and rotation liquid in-out valve hand wheel 78, open liquid in-out valve 75, liquid phase liquid gas enters storage liquid phase medium cavity volume under self saturated vapour pressure effect, then holding main valve valve rod handwheel 62 slowly revolves counterclockwise bleed valve 61 and opens vent valve 77 and discharge gas phase in liquid phase egg cavity volume from gas phase escape hole 76, the bleed valve 61 that turns clockwise rapidly when spraying gas-liquid mixture cuts out and holds liquid phase eggshell body handwheel 66 after vent valve 77 and the main valve valve rod handwheel 62 that turns clockwise cuts out liquid in-out valve 75 again, now in cavity volume, be full of liquid phase sample.Close for sample valve 72, unload liquid phase egg 17, sample complete, about 2min consuming time.
When liquid phase egg 9 is for sample as shown in Figure 1, sample introduction work functions menu in point touching screen man-machine interface 21, evaporator enters self-verifying instrument state, first piston assembly 41 is reset to lower dead center, then piston handling safety frame 46 is reset to lower dead center to close upper end cover 52, again piston assembly 41 is pushed into top dead centre will, by two-position five-way positive/negative pressure cross-over valve 28, piston cavity of resorption 36 will be communicated with atmosphere, when the servo-actuated transfiguration of piston is reduced pressure when realizing sample introduction, eliminates piston cavity of resorption 36 back pressures.Now touch screen human-computer interface 21 is pointed out and is entered sample introduction working routine, and piston assembly 41 is in top dead centre.Liquid phase egg 17 is contained on gas phase egg upper end cover 52, closing supplies gas regulates displacement combination valve 13, hold liquid phase eggshell body handwheel 66 and be rotated counterclockwise liquid phase egg 17 main valve valve rod handwheels 62 and rotate liquid in-out valve hand wheel 78 and open liquid in-out valve 75, in liquid phase egg, liquid phase liquid gas stores gas phase media cavity volume spray into gas phase egg under self saturated vapour pressure effect in, closes liquid phase egg liquid in-out valve 75 after 2 to 3 seconds.Injection instant pressure medium sensor be that piston upper chamber digital pressure sensor 11 detects an instantaneous pressure that is greater than 10kPa, PLC or MCU operation control program start to enter gasification monitor state, now the liquid phase sample in liquid phase egg cavity volume is all inputted in gas phase egg, completes the servo-actuated transfiguration vacuum flashing of piston phase transition process in 3 seconds.Medium is under superheated vapor state, and thermal molecular motion and the rapid homogenization of convective motion component, ensured accuracy and the repeatability of testing result, this process about 2min consuming time.Now can supply gasifying medium to testing instruments, total about 5min consuming time left and right, recruitment is people's independent operation only.Realize the Quick-gasifying of liquid phase liquefied petroleum gas (LPG) sample medium, eliminated the shortcoming of the gasifying process length consuming time of SH/T 0230-1992 " liquefied petroleum gas (LPG) composition measuring method (chromatography) ".After gasification, gas phase sample relies on the temperature control equipment in gas phase egg, makes its temperature constant for setting medium gasification temperature, presses 82 DEG C of settings as liquefied petroleum gas (LPG), higher than the gasification temperature of liquefied petroleum gas (LPG) C5, does not have gas phase sample dewfall and liquefaction phenomenon again; The liquid phase egg chamber internal volume that obtains liquid phase sample is 2～5mL, and does not need continuous blow-down sample in sampling process, has effectively reduced the sample discharge capacity of liquefied petroleum gas (LPG), has improved sample utilization factor, has reduced disaster hidden-trouble.
First work schematic diagram of the present invention obtains liquid phase sample medium 2～5ml by 17 samplings of liquid phase egg as shown in Figure 5, liquid phase is inputted to gas phase egg 9, after gas phase egg gasification, obtain and the constant temperature minute-pressure superheated vapor phase sample medium of liquid phase same composition, the sample medium gas phase of generation replace gas piping joint 16 by Self-closing lock and is connected to displacement use carrier gas input pipe 1; Regulate displacement combination valve and piston upper chamber communicating pipe 14 to be connected to supply gas with the adjusting displacement combination valve substitution gas delivery pipe 15 of supplying gas by supplying gas and regulate displacement combination valve, accompany hot gas piping 12 to output to quantitatively ring 83 of quantitative sample injection six-way valve through phase medium, as shown in Figure 6A for sample input quantitatively encircles MEDIA FLOW to schematic diagram, open quantitative sample injection six-way valve 82 sample input is quantitatively encircled to medium by quantitatively ring 83 of quantitative sample injection six-way valve, through spinner-type flowmeter 81, the waste gas of generation is discharged by discarding gas phase media delivery pipe 80; Quantitative sample injection six-way valve duty being adjusted to carrier gas after reaching official hour brings quantitative ring sample medium incoming inspection instrument into and flows to position, Fig. 6 B is that carrier gas is brought quantitative ring sample medium incoming inspection instrument into and flowed to schematic diagram, take over 84 by quantitatively ring 83 of quantitative sample injection six-way valve by the carrier gas of quantitative sample injection six-way valve, by doing sample program, the work of quantitative sample injection six-way valve is adjusted to the quantitative ring of sample input MEDIA FLOW to position, then carrier gas is input to sample medium quantitative in quantitatively encircling to detect in analytical instrument 86 by instrument sample introduction adapter 85.Be illustrated in figure 7 workflow diagram of the present invention.
Be not arranged under the state of liquid phase egg input gas phase egg experimental liquid phase medium entrance 51 in gas phase egg upper end cover at liquid phase egg, open in Fig. 1 and supply gas and regulate displacement combination valve 13, in point touching screen man-machine interface 21, replace function menu, evaporator automatically performs replacement procedure, piston up-down three times before this, by sucking and discharge air, the residual medium of a sample on cleaning piston upper chamber 48, three residual media of the interior upper sample of circulation back piston epicoele 48 are only 4.6/1000000000ths before displacement, can meet and adopt coulometry and chromatography to liquid gas sulphur content determination class ppm level analysis displacement requirement, control system instruction is simultaneously supplied gas and is regulated carrier gas input solenoid valve in displacement combination valve 13 to open, carrier gas enters to supply gas and regulates displacement combination valve 13, supply gas and regulate displacement combination valve and piston upper chamber communicating pipe 14, gas phase media fluid flow with heat tracing pipe 12, quantitative sample injection six-way valve 82, quantitative sample injection six-way valve quantity tube 83 is released a upper sample in Delivery lumen and is detained medium, while being replaced to piston upper chamber 48, it is 3min that carrier gas is carried out purge time to Delivery lumen, carrier gas flux is greater than 3000ml, 100 times of tube chamber volume 30ml, after displacement, reach the effect that Delivery lumen must not detect ppm level medium residual quantity, after above program, piston is pushed into top dead centre, eliminates gap between piston and upper end cover, now touch screen human-computer interface prompting enters sample introduction working routine.
Because displacement precision must not reach and detected ppm level medium residual quantity, can meet and adopt coulometry and chromatography to liquid gas sulphur content determination class ppm class precision analysis displacement requirement.
Certainly, above diagram, only for preferred embodiments of the present invention, not limits usable range of the present invention with this, and all employings inventive concept disclosed in this invention, the technical scheme that is equal to replacement or equivalent transformation are included in protection scope of the present invention.
Claims (6)
1. a low pressure liquefied gas inspection sample introduction evaporator that contains automatic replacing device, comprise a liquid phase egg (17) that obtains liquid phase medium sample and one contain automatic replacing device by sample gasification and provide the gas phase egg (9) of gas phase media sample to testing instruments, and corresponding constant temperature, constant voltage, displacement, required control system and power system and the corresponding control program software of clean maintenance corresponding functional unit; It is characterized in that, described control program software package overlaps program element composition containing temperature control, pressure medium control, displacement work, clean maintenance, sample introduction work, manual operation six, and each program element is controlled the each execution components and parts on drive plate (3) by programmable logic controller (PLC) (PLC) or micro-control unit (MCU) operation;
The position of described displacement working routine unit control piston assembly (41) in cylinder assembly (38), realization is replaced combination valve (13), is supplied gas to regulate and replace combination valve and piston upper chamber communicating pipe (14), gas phase media fluid flow with heat tracing pipe (12), quantitative sample injection six-way valve (82), the interior medium discharge of quantitative sample injection six-way valve quantity tube (83) and suction substitution gas piston upper chamber (48), the adjusting of supplying gas, and minimizing medium residual quantity in medium cavity volume reaches the function that accuracy of detection requires;
In described automatic replacing device, each program element is controlled the each execution components and parts on drive plate (3) by programmable logic controller (PLC) (PLC) or micro-control unit (MCU) operation, and described automatic replacing device is by described piston assembly (41), oilless air compressor (27), upper end cover (52), described cylinder assembly (38), low head (59), liquid phase egg input gas phase egg experimental liquid phase medium entrance (51), displacement Abgasabsaugung hole (50), described supplying gas regulates displacement combination valve (13), supply gas and regulate displacement combination valve substitution gas delivery pipe (15), displacement carrier gas input pipe (10), Self-closing lock displacement gas piping joint (16), described supplying gas regulates displacement combination valve and piston upper chamber communicating pipe (14), described gas phase media fluid flow with heat tracing pipe (12), described quantitative sample injection six-way valve (82), described quantitative sample injection six-way valve quantity tube (83), spinner-type flowmeter (81), discarded gas phase media delivery pipe (80), waste air setting pneumatics flexible pipe (18), displacement exhaust emission tube (33) composition,
Described oilless air compressor (27) is arranged on the bottom-right position of described cylinder assembly (38), described supply gas regulate displacement combination valve (13) be arranged on described cylinder assembly (38) above, described piston assembly (41) is arranged on the inside of described cylinder assembly (38), described upper end cover (52) is arranged on the upper end of described cylinder assembly (38), described low head (59) is arranged on the lower end of described cylinder assembly (38), on described upper end cover (52), be provided with described liquid phase egg and input gas phase egg experimental liquid phase medium entrance (51) and described displacement Abgasabsaugung hole (50), carrier gas input pipe for described displacement (10) is connected to described Self-closing lock displacement gas piping joint (16), described in described Self-closing lock displacement gas piping joint (16) connects by the described adjusting displacement combination valve substitution gas delivery pipe (15) of supplying gas, supply gas and regulate displacement combination valve (13), described supplying gas regulates displacement combination valve (13) one end to connect described gas phase media fluid flow with heat tracing pipe (12), the other end connects to supply gas to regulate replaces combination valve and piston upper chamber communicating pipe (14), described quantitative sample injection six-way valve (82) is connected described gas phase media fluid flow with heat tracing pipe (12) with described quantitative sample injection six-way valve quantity tube (83), described quantitative sample injection six-way valve (82) is connected to described discarded gas phase media delivery pipe (80) through described spinner-type flowmeter (81), described discarded gas phase media delivery pipe (80) is connected to described waste air setting pneumatics flexible pipe (18), is then communicated with described displacement exhaust emission tube (33),
Described control system is made up of mainboard (20), drive plate (3), touch screen human-computer interface (21) and relevant pressure, temperature, time, range sensor.
2. contain according to claim 1 the low pressure liquefied gas inspection sample introduction evaporator of automatic replacing device, it is characterized in that, described piston upper chamber (48) substitute mode is: control system instruction two-position five-way positive/negative pressure cross-over valve (28) by described oilless (oil free) compressor (27) porting follow procedure circulating picture-changing to, described oilless (oil free) compressor (27) to piston cavity of resorption circulation output just, negative pressure, upstroke when input malleation, descent of piston when input negative pressure, up-downgoing stop is by programmable logic controller (PLC) (PLC) or micro-control unit (MCU) controlling run, replace by piston up-down, up Exhaust Gas is siphoned away by described oil-free air compressor (27), descending inhale fresh air, piston movement is during to top dead centre, piston upper chamber volume is less than 1ml, when piston movement arrives lower dead center, piston upper chamber volume is greater than 1300ml, the upper and lower shuttling movement of piston once, residual gas is only after a upper circulation after 7.7/10000ths, three times of gas circulations, to be only 4.6/1000000000ths before displacement, can meet and adopt coulometry and chromatography to liquid gas sulphur content determination class ppm level analysis displacement requirement.
3. contain according to claim 1 the low pressure liquefied gas inspection sample introduction evaporator of automatic replacing device, it is characterized in that, described supplying gas regulates displacement combination valve (13), described supplying gas regulates displacement combination valve and piston upper chamber communicating pipe (14), described gas phase media fluid flow with heat tracing pipe (12), described quantitative sample injection six-way valve (82), described quantitative sample injection six-way valve quantity tube (83) substitute mode is: synchronize and carry out with described piston upper chamber (48) displacement, described in control system instruction, supply gas and regulate carrier gas input solenoid valve in displacement combination valve (13) to open, carrier gas enters to supply gas and regulates displacement combination valve (13), supply gas and regulate displacement combination valve and piston upper chamber communicating pipe (14), gas phase media fluid flow with heat tracing pipe (12), in quantitative sample injection six-way valve (82) and quantitative sample injection six-way valve quantity tube (83), Delivery lumen is purged, purge time 3min, carrier gas flux is greater than 3000ml, 100 times of tube chamber volume 30 ml, after displacement, must not detect ppm level medium residual quantity.
4. contain according to claim 2 the low pressure liquefied gas inspection sample introduction evaporator of automatic replacing device, it is characterized in that, described oilless air compressor (27) is Double-head, one of them head is made vacuum pump for replacing Abgasabsaugung, and another head coordinates the described piston assembly of driving (41) to move up and down with described two-position five-way positive/negative pressure cross-over valve (28).
5. sample introduction evaporator is used in the low pressure liquefied gas inspection that contains according to claim 2 automatic replacing device, it is characterized in that, descent of piston inhale fresh air is by liquid phase egg input gas phase egg experimental liquid phase medium entrance (51) input.
6. according to the low pressure liquefied gas inspection sample introduction evaporator that contains automatic replacing device described in claim 2 or 3, it is characterized in that, change waste gas and be delivered to safety dumping place by described discarded gas phase media delivery pipe (80), described displacement exhaust emission tube (33).
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| CN201310514272.9A CN103543227B (en) | 2013-10-28 | 2013-10-28 | Sampling evaporator comprising automatic replacement device and used for low-pressure liquefied gas inspection |
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| EP1001170A2 (en) * | 1998-11-11 | 2000-05-17 | TGK Co., Ltd. | Variable displacement compressor |
| WO2004079468A1 (en) * | 2003-03-06 | 2004-09-16 | Tgk Co., Ltd. | Flow rate control valve |
| CN102313786A (en) * | 2011-04-18 | 2012-01-11 | 孝感市计量检定测试所 | Sample-introduction evaporator of gas chromatograph for liquefied petroleum gas |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP5292537B2 (en) * | 2006-08-25 | 2013-09-18 | 株式会社テージーケー | Expansion device |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1001170A2 (en) * | 1998-11-11 | 2000-05-17 | TGK Co., Ltd. | Variable displacement compressor |
| WO2004079468A1 (en) * | 2003-03-06 | 2004-09-16 | Tgk Co., Ltd. | Flow rate control valve |
| CN102313786A (en) * | 2011-04-18 | 2012-01-11 | 孝感市计量检定测试所 | Sample-introduction evaporator of gas chromatograph for liquefied petroleum gas |
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Effective date of registration: 20200424 Address after: 236200 Anhui province Fuyang City Yingshang County Industrial Park Bao Lu tube Patentee after: ANHUI OURUIDA ELECTRICAL APPLIANCE TECHNOLOGY Co.,Ltd. Address before: 432000 No. 17, fairy Road, Xiaogan, Hubei Patentee before: Xu Jicheng |
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