CN105403290A - Natural gas circular flow standard test system - Google Patents
Natural gas circular flow standard test system Download PDFInfo
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- CN105403290A CN105403290A CN201510755574.4A CN201510755574A CN105403290A CN 105403290 A CN105403290 A CN 105403290A CN 201510755574 A CN201510755574 A CN 201510755574A CN 105403290 A CN105403290 A CN 105403290A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F25/00—Testing or calibration of apparatus for measuring volume, volume flow or liquid level or for metering by volume
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Abstract
The invention relates to a natural gas circular flow standard test system. The natural gas circular flow standard test system mainly includes a gas source, standard flow generating systems, a table for meters to be detected, a security system, an upper and lower computer control system and pipelines; wherein the gas source includes standard gas cylinders which respectively store high pure nitrogen and natural gas; the standard flow generating systems include a standard meter method gas standard flow generating system for generating mass flow, and a piston gas standard flow generating system for generating medium and small flow; the table for the meters to be detected is in parallel connection with detecting lines suitable for different specifications of the meters to be detected; the pipelines include metal rigid tubes and valves; the security system mainly includes natural gas alarms and a residual oxygen analysis meter; and the upper and lower computer control system includes an explosion-proof computer and control components. The natural gas circular flow standard test system can perform real flow detection on natural gas flow measurement meters through serving natural gas as a test medium, and the detection result is more accurate and reliable.
Description
Technical field
The present invention relates to a kind of rock gas circular flow code test system, especially relate to the flow standard pilot system that the real stream of gas flow meter table rock gas detects.
Background technology
Method of standard table is the method for examining and determine flowmeter with proving flowmeter as flow standard, and this method transmission of quantity value is convenient, flow range is wide, calibrating efficiency is high, is obtained for general development in various countries.Piston fluid standard set-up is a development recent years class standard device more rapidly, compares and is applicable to medium-small flow metering.
At present, the assay calibration of majority of gas flowmeter all adopts air as test medium, and one is because air is drawn materials extensively, and two is because air is safer.But the impact that the character adopting air to have ignored tested flowmeter actual circulation medium produces metering, such as thermal mass flow meter, its mass rate recorded is relevant with the physical property of gas, adopt air carry out flow test be not enough to reflect true environment for use under accuracy of measuring situation.
Summary of the invention
In order to solve Problems existing in background technology, the invention provides a kind of rock gas circular flow code test system, this system adopts method of standard table gas flow standard device and piston-type gas flow standard device as normal flow generation systems.Two cover systems all can realize natural circulating, and the rock gas realizing gas flow instrument flows test in fact.
In order to achieve the above object, the technical solution used in the present invention is:
Be made up of source of the gas, normal flow generation systems, tested table platform position, security system, upper and lower computer control system and pipeline six part; Source of the gas is placed in a relatively independent space with flame proof function; Normal flow generation systems, tested table platform position and pipeline form rock gas loop hardware system; The natural gas reports to the police machine in security system installs several according to the area in this system footprint room, and residual oxygen analytical instrument is placed near the exhausr port of this rock gas circulation system; Lower computer control system to control in whole system valvular opening and closing, the operation of device, the running of equipment, the collection of flowmeter and sensing data and storage etc.; Host computer is an explosion-proof computer, and primary responsibility is alternately man-machine.
Described source of the gas comprises nitrogen and rock gas two kinds of gases, is loaded on respectively in calibrating gas bottle.Rock gas is test(ing) medium.Needed first to purge whole pilot system pipeline with nitrogen before being filled with rock gas to this pilot system, discharge air, in order to avoid remnant oxygen mixes with rock gas cause hidden peril of explosion; Tested table also needs to purge, in order to avoid be mixed into oxygen in pipeline gas in the pipeline at tested table platform position place with nitrogen after changing.
Described normal flow generation systems comprise for generation of large discharge method of standard table gas standard flow generation systems and produce the gas piston normal flow generation systems of medium-small flow.Method of standard table gas standard flow generation systems mainly comprises temperature controller, proving flowmeter, explosion-proof fan, flow control valve, surge tank and valve; Explosion-proof fan provides power for gas circulating flow, and its delivery rate is regulated by frequency converter; Flow control valve carries out fine adjustment to flow, makes flow in pipeline reach near tested flow point; Surge tank plays the stable effect of buffering to from blower fan gas out, makes flow rate fluctuation in pipeline little; The gas higher from blower fan temperature is out cooled to room temperature by temperature controller; Normal flow counts the standard of method of standard table gas standard flow generation systems, and its instruction flow is normal flow.Gas piston normal flow generation systems mainly comprises a set of dual cavity piston type gas flow calibrating device and some valves; Dual cavity piston type gas flow calibrating device is the standard of gas piston normal flow generation systems, is also the power source of gas flowing simultaneously; In dual cavity piston type gas flow calibrating device, piston all can carry out flow test to tested table in forward travel state and fallback state.
When carrying out flow test to tested table, test(ing) medium rock gas need collect and do test next time used.In method of standard table gas standard flow generation systems, all pipelines, valve and equipment form a closed-loop system jointly, and the test(ing) medium through tested table increases pressure by blower fan, enter next round flowing.In gas piston normal flow generation systems, first using a chamber of dual cavity piston type gas flow calibrating device as working chamber, another chamber as test(ing) medium collecting chamber, until working chamber volume arrive minimum value time, piston ceases movement; During next round test, piston is to motion in the other direction, and now, original working chamber becomes test(ing) medium collecting chamber, and original test(ing) medium collecting chamber becomes working chamber, circulates and so forth.
Described tested table platform position is parallel with the detection line of the tested table of applicable different size bore, and every bar detection line can complete the detection of multiple tested table simultaneously.In order to meet the tested table of various inlet direction (left air inlet and right air inlet), tested table platform position can realize the conversion of left and right air inlet by the switching of valve.
Described security system comprises the natural gas reports to the police machine and residual oxygen analytical instrument.The natural gas reports to the police machine, for detecting concentration of natural gas in room, sends warning in time, prevents blast, needs the special case rational deployment of settling according to this pilot system, install several.When purging the air in system pipeline, instrument and equipment with nitrogen, residual oxygen analytical instrument is utilized to monitor oxygen content in the gas purged out, this oxygen content may be used for oxygen content in characterization system, when oxygen content can inject rock gas lower than during a certain value in system.
Described upper and lower computer control system is made up of explosion-proof computer and balancing boom device, and wherein, all balancing boom devices need be arranged in explosion-proof electrical control cubicles.In whole system, all the sensors, control panel and valve need have explosion-resistance characteristic.
The beneficial effect that the present invention has is:
1, the present invention adopts rock gas to carry out flow test as test medium flow meter amount instrument, has taken into full account the impact of medium composition on tested instrument measurement precision, has made testing result more accurately and reliably.
2, the test medium rock gas that the present invention adopts recycles in whole pilot system, and loss is very little, and safer.
3, the present invention adopts the standard of method of standard table and piston type two kinds of principles, and flow range is wider.
4, the present invention can be switched the left and right air inlet of tested table platform position by the opening and closing of valve, expands the tested table scope of application.
Accompanying drawing explanation
Fig. 1 is structural representation of the present invention.
In figure: 1, the natural gas reports to the police machine, 2, gas cabinet, 3, explosion-proof computer, 4, explosion-proof electrical control cubicles, 5, motor, 6, dual cavity piston type gas flow calibrating device, 7, vacuum pump, 8, surge tank, 9, frequency converter, 10, explosion-proof fan, 11, flow control valve, 12, standard scale, 13, temperature controller, 14, tested table platform position, 15, residual oxygen analytical instrument, 16, valve 1,17, valve 2,18, valve 3,19, valve 4,20, valve 5,21, valve 6,22, valve 7,23, valve 8,24, valve 9,25, valve 10,26, valve 11,27, valve 12,28, valve 13,29, valve 14,30, valve 15,31, valve 16,32, valve 17,33, valve 18,34, valve 19,35, valve 20,36, valve 21,37, valve 22,38, valve 23,39, valve 24,40, valve 25,41, valve 26,42, valve 27,43, valve 28,44, valve 29,45, valve 30,46, valve 31,47, valve 32,48, valve 33,49, valve 34,50, valve 35,51, valve 36,52, method of standard table gas standard flow generation systems, 53, gas piston normal flow generation systems, 54, upper and lower computer control system, 55, piston, 56, I detection line.
Embodiment
Below in conjunction with drawings and Examples, the present invention will be further described.
As shown in Figure 1, the present invention is made up of source of the gas 2, normal flow generation systems 52/53, tested table platform position 14, security system, upper and lower computer control system 54 and pipeline six part; Source of the gas 2 is placed in a relatively independent space with flame proof function; Normal flow generation systems 52/53, tested table platform position 14 and pipeline form rock gas loop hardware system; The natural gas reports to the police machine 1 in security system installs several according to the area in this system footprint room, and residual oxygen analytical instrument 15 is placed near the exhausr port of this rock gas circulation system; Lower computer control system to control in whole system valvular opening and closing, the operation of device, the running of equipment, the collection of flowmeter and sensing data and storage etc.; Host computer is an explosion-proof computer 3, and primary responsibility is alternately man-machine.
As shown in Figure 1, source of the gas 2 comprises nitrogen and rock gas two kinds of gases, is loaded on respectively in calibrating gas bottle.Rock gas is test(ing) medium.Needed first to purge the air in whole pilot system pipeline with nitrogen before being filled with rock gas to this pilot system, discharge air, in order to avoid remnant oxygen mixes with rock gas cause hidden peril of explosion; Tested table also needs to purge, in order to avoid be mixed into oxygen in pipeline gas in the pipeline at tested table platform position place with nitrogen after changing.
As shown in Figure 1, normal flow generation systems 52/53 comprise for generation of large discharge method of standard table gas standard flow generation systems 52 and produce the gas piston normal flow generation systems 53 of medium-small flow.Method of standard table gas standard flow generation systems 52 mainly comprises temperature controller 13, proving flowmeter 12, explosion-proof fan 10, flow control valve 11, surge tank 8 and valve; Explosion-proof fan 10 provides power for gas circulating flow, and its delivery rate is regulated by frequency converter 9; Flow control valve 11 pairs of flows carry out fine adjustment, make flow in pipeline reach near tested flow point; Surge tank 8 plays the stable effect of buffering to from blower fan gas out, makes flow rate fluctuation in pipeline little; The gas higher from blower fan temperature is out cooled to room temperature by temperature controller 13; Proving flowmeter 12 is the standard of method of standard table gas standard flow generation systems 52, and its instruction flow is normal flow.Gas piston normal flow generation systems 53 mainly comprises a set of dual cavity piston type gas flow calibrating device 6 and some valves; Dual cavity piston type gas flow calibrating device 6 is the standard of gas piston normal flow generation systems 53, is also the power source of gas flowing simultaneously; In dual cavity piston type gas flow calibrating device 6, piston 55 all can carry out flow test to tested table in forward travel state and fallback state.
As shown in Figure 1, when carrying out flow test to tested table, test(ing) medium rock gas need collect and do test next time used.In method of standard table gas standard flow generation systems 52, all pipelines, valve and equipment form a closed-loop system jointly, and the test(ing) medium through tested table increases pressure by blower fan 10, enter next round flowing.In gas piston normal flow generation systems 53, first using a chamber of dual cavity piston type gas flow calibrating device 6 as working chamber, another chamber as test(ing) medium collecting chamber, until working chamber volume arrive minimum value time, piston 55 stop motion; During next round test, piston 55 is to motion in the other direction, and now, original working chamber becomes test(ing) medium collecting chamber, and original test(ing) medium collecting chamber becomes working chamber, circulates and so forth.
As shown in Figure 1, tested table platform position 14 is parallel with the detection line of the tested table of applicable different size bore, and every bar detection line can complete the detection of multiple tested table simultaneously.In order to meet the tested table of various inlet direction (left air inlet and right air inlet), tested table platform position 14 can realize the conversion of left and right air inlet by the switching of valve.
As shown in Figure 1, security system comprises the natural gas reports to the police machine 1 and residual oxygen analytical instrument 15.The natural gas reports to the police machine 1, for detecting concentration of natural gas in room, sends warning in time, prevents blast, needs the special case rational deployment of settling according to this pilot system, install several.When purging the air in system pipeline, instrument and equipment with nitrogen, residual oxygen analytical instrument 15 is utilized to monitor oxygen content in the gas purged out, this oxygen content may be used for oxygen content in characterization system, when oxygen content can inject rock gas lower than during a certain value in system.
As shown in Figure 1, upper and lower computer control system is made up of explosion-proof computer 3 and balancing boom device, and wherein, all balancing boom devices need be arranged in explosion-proof electrical control cubicles 4.In whole system, all the sensors, control panel and valve need have explosion-resistance characteristic.
Principle of work of the present invention is as follows:
This rock gas circular flow code test system does not need to purge whole system pipeline first or for a long time before reusing afterwards, concrete operations are: be installed on platform position by tested table, open all valves in whole system except safety valve and gas cylinder on/off valve; First open the switch valve of nitrogen gas cylinder, high pressure nitrogen flows through all pipelines in system, is extruded by the air that pipeline Central Plains pre-exists from exhausr port; After a period of time, close nitrogen gas cylinder on/off valve, valve 31 and valve 32, opening vacuum pump and the potpourri of nitrogen in pipeline and air is extracted out, when arriving the maximum vacuum that vacuum pump can reach, closing vacuum pump; Then, with the operation of gas in nitrogen sparge tube road before continuation, again to find time gas in pipelines with vacuum pump after a period of time; So repeatedly " sweep-take out " until residual oxygen analytical instrument detects that in the gas of gas outlet, oxygen content is lower than dangerous values.Close nitrogen gas cylinder on/off valve, valve 31 and valve 32, open vacuum pump and gas in pipelines is evacuated to maximum vacuum; Close vacuum pump, open natural gas cylinder switch valve, high-pressure natural gas enters and is full of system pipeline.
When carrying out the test of large discharge gas discharge, adopt method of standard table gas standard flow generation systems.Suppose to use I detection line.When tested table is left air inlet table, open valve 11, valve 10, valve 5, valve 6, valve 7, valve 17, valve 20, valve 23, valve 24, valve 25, valve 26 and valve 30, close other all valves, open blower fan, adjust flux variable valve until in pipeline gas discharge reach and detect flow point, start flow test.When tested table is right air inlet table, open valve 11, valve 10, valve 5, valve 6, valve 7, valve 17, valve 18, valve 26, valve 25, valve 24, valve 23 and valve 19, close other all valves, open blower fan, adjust flux variable valve until in pipeline gas discharge reach and detect flow point, start flow test.A collection of tested watch test is complete, close all valves, unload the tested table examined, change new tested table, now need to open nitrogen cylinder switch valve, valve 33, valve 24, valve 25, valve 26, valve 31 and valve 32, utilize nitrogen to purge tested table platform position pipeline, discharge air, after a period of time, close all valves, open valve 24, valve 25, valve 26 and valve 9, open vacuum pump, the potpourri of nitrogen and air in the pipeline of tested table platform position is extracted out; Repeating " sweep-take out " operation several times to make in pipeline oxygen content lower than dangerous values; When pipeline is in vacuum state, open all valves that when being in trystate, needs are opened; Now can open natural gas cylinder switch valve, valve 3 and valve 4, appropriate supplementing is carried out to the rock gas in test pipeline.
When carrying out the test of medium-small flow gas discharge, adopt gas piston normal flow generation systems.Suppose to use I detection line.Piston is in origin position before starting test.When tested table is left air inlet table, open valve 13, valve 15, valve 20, valve 23, valve 24, valve 25, valve 26, valve 29 and valve 14, close other all valves, piston is at the uniform velocity mobile forward to be produced the rock gas of normal flow thus calibrates tested table; Rock gas through tested table gets back to piston cylinder back cavity to treat that next time uses.When piston advances forward terminates to this process of the test during extreme position, piston ceases movement.Piston back moves also can carry out flow test, now opens valve 14, valve 16, valve 23, valve 24, valve 25, valve 26, valve 18, valve 15 and valve 13, starts piston uniform motion, and rock gas arrives ante-chamber from piston cylinder back cavity through tested table.When tested table is right air inlet, open valve 13, valve 15, valve 18, valve 26, valve 25, valve 24, valve 23, valve 16 and valve 14, close other all valves, piston is at the uniform velocity mobile forward to be produced the rock gas of normal flow thus carries out flow test to tested table; When backward stroke of the piston carries out flow test, open valve 14, valve 29, valve 26, valve 25, valve 24, valve 23, valve 20, valve 15 and valve 13, close other all valves, piston back move produce normal flow rock gas thus flow test is carried out to tested table.Also need after changing tested table to utilize nitrogen and vacuum pump to carry out " sweep-take out " operation several times to tested table platform position.
Above-mentioned embodiment is used for explaining and the present invention is described, instead of limits the invention, and in the protection domain of spirit of the present invention and claim, any amendment make the present invention and change, all fall into protection scope of the present invention.
Claims (7)
1. a rock gas circular flow code test system, is characterized in that: be made up of source of the gas (2), normal flow generation systems (52,53), tested table platform position (14), security system, upper and lower computer control system (54) and pipeline six part; Source of the gas (2) is placed in a relatively independent space with flame proof function; Normal flow generation systems (52,53), tested table platform position (14) and pipeline form rock gas loop hardware system; The natural gas reports to the police machine (1) in security system installs several according to the area in this system footprint room, and residual oxygen analytical instrument (15) is placed near the exhausr port of this rock gas circulation system; Lower computer control system to control in whole system valvular opening and closing, the operation of device, the running of equipment, the collection of flowmeter and sensing data and storage; Host computer is an explosion-proof computer (3), and primary responsibility is alternately man-machine.
2. a kind of rock gas circular flow code test system according to claim 1, is characterized in that: described source of the gas (2) comprises nitrogen and rock gas two kinds of gases, is loaded on respectively in calibrating gas bottle; Rock gas is test(ing) medium; Needed first to purge the air in whole pilot system pipeline with nitrogen before being filled with rock gas to this pilot system, discharge air, in order to avoid remnant oxygen mixes with rock gas cause hidden peril of explosion; Tested table also needs to purge, in order to avoid be mixed into oxygen in pipeline gas in the pipeline at tested table platform position place with nitrogen after changing.
3. a kind of rock gas circular flow code test system according to claim 1, is characterized in that: described normal flow generation systems (52,53) comprise for generation of large discharge method of standard table gas standard flow generation systems (52) and produce the gas piston normal flow generation systems (53) of medium-small flow;
Method of standard table gas standard flow generation systems (52) mainly comprises temperature controller (13), proving flowmeter (12), explosion-proof fan (10), flow control valve (11), surge tank (8) and valve; Explosion-proof fan (10) provides power for gas circulating flow, and its delivery rate is regulated by frequency converter (9); Flow control valve (11) carries out fine adjustment to flow, makes flow in pipeline reach near tested flow point; Surge tank (8) plays the stable effect of buffering to from blower fan gas out, makes flow rate fluctuation in pipeline little; The gas higher from blower fan temperature is out cooled to room temperature by temperature controller (13); Proving flowmeter (12) is the standard of method of standard table gas standard flow generation systems (52), and its instruction flow is normal flow;
Gas piston normal flow generation systems (53) mainly comprises a set of dual cavity piston type gas flow calibrating device (6) and some valves; Dual cavity piston type gas flow calibrating device (6) is the standard of gas piston normal flow generation systems (53), is also the power source of gas flowing simultaneously; In dual cavity piston type gas flow calibrating device (6), piston (55) all can carry out flow test to tested table in forward travel state and fallback state.
4. a kind of rock gas circular flow code test system according to claim 3, is characterized in that: when carrying out flow test to tested table, test(ing) medium rock gas need collect and do test next time used; In method of standard table gas standard flow generation systems (52), all pipelines, valve and equipment form a closed-loop system jointly, and the test(ing) medium through tested table increases pressure by blower fan (10), enter next round flowing; In gas piston normal flow generation systems (53), first using a chamber of dual cavity piston type gas flow calibrating device (6) as working chamber, another chamber as test(ing) medium collecting chamber, until working chamber volume arrive minimum value time, piston (55) stop motion; During next round test, piston (55) is to motion in the other direction, and now, original working chamber becomes test(ing) medium collecting chamber, and original test(ing) medium collecting chamber becomes working chamber, circulates and so forth.
5. a kind of rock gas circular flow code test system according to claim 1, is characterized in that: described tested table platform position (14) is parallel with the detection line of the tested table of applicable different size bore, and every bar detection line can complete the detection of multiple tested table simultaneously; In order to meet the tested table of left air inlet and right air inlet airintake direction, tested table platform position (14) realizes the conversion of left and right air inlet by the switching of valve.
6. a kind of rock gas circular flow code test system according to claim 1, is characterized in that: described security system comprises the natural gas reports to the police machine (1) and residual oxygen analytical instrument (15); The natural gas reports to the police machine (1), for detecting concentration of natural gas in room, sends warning in time, prevents blast, needs the special case rational deployment of settling according to this pilot system, install several; When purging the air in system pipeline, instrument and equipment with nitrogen, residual oxygen analytical instrument (15) is utilized to monitor oxygen content in the gas purged out, this oxygen content may be used for oxygen content in characterization system, when oxygen content can inject rock gas lower than during a certain value in system.
7. a kind of rock gas circular flow code test system according to claim 1, it is characterized in that: described upper and lower computer control system is made up of explosion-proof computer (3) and balancing boom device, wherein, all balancing boom devices need be arranged in explosion-proof electrical control cubicles; In whole system, all the sensors, control panel and valve need have explosion-resistance characteristic.
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| CN201510755574.4A CN105403290A (en) | 2015-11-09 | 2015-11-09 | Natural gas circular flow standard test system |
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| CN201510755574.4A CN105403290A (en) | 2015-11-09 | 2015-11-09 | Natural gas circular flow standard test system |
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| CN107860443A (en) * | 2017-12-12 | 2018-03-30 | 杭州天马计量科技有限公司 | Air pulsing flow standard experimental rig |
| CN109323236A (en) * | 2018-09-30 | 2019-02-12 | 西安鑫顶天装备智能科技有限公司 | A kind of energy saving technique of boiler combustion |
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