CN208596126U - A kind of liquid natural gas gasification rate measuring circuit - Google Patents
A kind of liquid natural gas gasification rate measuring circuit Download PDFInfo
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- CN208596126U CN208596126U CN201821047158.4U CN201821047158U CN208596126U CN 208596126 U CN208596126 U CN 208596126U CN 201821047158 U CN201821047158 U CN 201821047158U CN 208596126 U CN208596126 U CN 208596126U
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- resistance
- natural gas
- thermistor
- circuit
- liquid natural
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- 238000002309 gasification Methods 0.000 title claims abstract description 64
- 239000003949 liquefied natural gas Substances 0.000 title claims abstract description 64
- 239000006200 vaporizer Substances 0.000 claims abstract description 6
- 230000005611 electricity Effects 0.000 claims description 8
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 6
- 239000000203 mixture Substances 0.000 claims description 2
- 238000005259 measurement Methods 0.000 abstract description 7
- 238000003912 environmental pollution Methods 0.000 abstract description 4
- 230000007812 deficiency Effects 0.000 abstract description 2
- 239000002699 waste material Substances 0.000 abstract description 2
- 230000000977 initiatory effect Effects 0.000 abstract 1
- 238000000034 method Methods 0.000 description 7
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 6
- 239000007789 gas Substances 0.000 description 5
- 230000007423 decrease Effects 0.000 description 4
- 239000007788 liquid Substances 0.000 description 3
- 239000003345 natural gas Substances 0.000 description 3
- 230000008447 perception Effects 0.000 description 2
- 238000011084 recovery Methods 0.000 description 2
- 238000009834 vaporization Methods 0.000 description 2
- 230000008016 vaporization Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 238000005303 weighing Methods 0.000 description 1
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- Measuring Volume Flow (AREA)
Abstract
The utility model discloses a kind of liquid natural gas gasification rate measuring circuits, including bridge circuit and control circuit, bridge circuit is made of the precision resistance and amendable precision resistance of thermistor and flow velocity the compensation resistance of testing liquid natural gas gasifying chamber interior and the meter body interior of connection vaporizer；The resistance value of thermistor changes in liquid natural gas gasification with the variation of gasification rate, keeps electric bridge uneven；Thermistor makes to keep constant temperature and resistance value constant according to the control signal that the control circuit received issues, and electric bridge is made to restore balance；Flow velocity compensates resistance, and according to liquid natural gas, itself resistance value is adjusted in the difference of gasification rate in gasification, and electric bridge is made to restore balance.The utility model can prevent from gasifying caused by deficiency initiation failure and gasification excessively and waste and pollute, to realize the high-acruracy survey of gasification rate, save the cost and reduce environmental pollution, and this measuring circuit is simple and reliable for structure, measurement accuracy is higher.
Description
Technical field
The utility model relates to field of measuring technique, and in particular to a kind of liquid natural gas gasification rate measuring circuit.
Background technique
Natural gas is essential important energy source in people's life and work, and wherein liquefied natural gas is the shape with liquid
Formula storage usually utilizes the natural gas of gas but when practical application, therefore, it is necessary to by liquefied natural gas into
Promoting the circulation of qi.In the gasification to liquefied natural gas, gasification deficiency can then cause failure, and gasification is excessive then to will lead to natural gas
Waste and environmental pollution.Therefore, it in the gasification of liquefied natural gas, needs to carry out essence to the gasification rate of liquid natural gas
True measurement, liquefied natural gas gasifying process is precisely controlled to realize.
For the problems in the relevant technologies, currently no effective solution has been proposed.
Utility model content
Technical problem to be solved in the utility model is how accurately to be measured liquid natural gas gasification rate,
To realize the problem of being precisely controlled to liquid natural gas gasification.
In order to solve the above-mentioned technical problem, technical solution used by the utility model is to provide a kind of liquid natural gas gas
Change speed measurement circuit, including bridge circuit and control circuit, the bridge circuit is by testing liquid natural gas gasifying chamber interior
Thermistor and flow velocity compensation resistance and the connection vaporizer meter body interior precision resistance and can correct
Precision resistance composition；The resistance value of the thermistor becomes in liquid natural gas gasification with the variation of gasification rate
Change, keeps bridge circuit uneven；The thermistor makes to keep according to the control signal that the control circuit received issues
Constant temperature and resistance value are constant, and bridge circuit is made to restore balance；The flow velocity compensation resistance was gasifying according to the liquid natural gas
Itself resistance value is adjusted in the difference of gasification rate in journey, compensates the thermistor and sends out in liquid natural gas gasification
Raw change in resistance, makes bridge circuit restore balance；
The control circuit is made of input terminal and output end, wherein input terminal includes being integrated in the meter ontology
The adjustable voltage power supply of internal integrated circuit and the power supply size for adjusting the bridge circuit, the integrated circuit are used for
Outputting and inputting for the bridge circuit is controlled, output signal is amplified, while being converted to digital signal；Output end includes
Electric bridge for measuring the potentiometer of the precision resistance both end voltage size, for adjusting the bridge circuit balance of voltage is flat
Weigh potentiometer and for measuring the galvanometer for flowing through two bridge arm size of current of the thermistor and precision resistance.
In the above scheme, as liquefied natural gas gasifying rate changes temperature and resistance value change occur for the thermistor
Change, keeps the bridge circuit uneven；The bridge balance potentiometer exports unbalanced signal to the integrated circuit, the collection
The unbalanced signal is amplified at circuit and is converted to digital signal and is output to the adjustable voltage power supply and galvanometer,
The adjustable voltage power supply and galvanometer feed back the digital signal to the bridge circuit, inhibit the temperature of the thermistor
Degree changes, and the change in resistance of thermistor described in resnstance transformer is compensated by the flow velocity, and the thermistor is made to keep permanent
Mild resistance value is constant, so that the bridge circuit is restored balance, wherein the thermistor and two bridge arm electric current of precision resistance are big
It is small directly proportional to the gasification rate of the liquefied natural gas.
In the above scheme, the precision resistance is connected with the thermistor, and the voltage at the precision resistance both ends is big
The small output signal as the liquid natural gas gasification rate size.
In the above scheme, the flow velocity compensation resistance is integrated by series and parallel compensated resistance, and one of resistance is that temperature is sensitive
Element, the temperature-sensing element (device) setting have in flow field identical with the thermistor, and with the thermistor
Identical temperature coefficient.
In the above scheme, the temperature-sensing element (device) is made of the coil with larger area.
In the above scheme, in the bridge circuit, the resistance value of the precision resistance is 100 Ω；It is described amendable
The Standard resistance range of precision resistance is 0-200 Ω；The thermistor be by the water triple point resistance of thermometer measure (100 ±
1)Ω；The water triple point resistance that the flow velocity compensation resistance passes through thermometer measure is (25 ± 1) Ω.
The utility model be directed to liquefied natural gas gasifying during, how the size of accurate perception amount of vaporization, provide one
Kind liquid natural gas gasification rate measuring circuit can be caused in gasification by temperature change by detecting liquefied natural gas
Resistance variation mode, the size of the gasification rate of liquid natural gas is accurately measured indirectly, passes through adjusting
The electric bridge due to caused by the variation of gasification rate is uneven, keeps the electric bridge rate recovery that restores balance and gasify normal, thus reality
Now liquefied natural gas gasifying process is precisely controlled.The measuring circuit that the utility model uses is simple and reliable for structure, measures model
Enclose wider, and measurement accuracy is higher, can prevent liquid natural gas gasification it is insufficient cause it is natural caused by failure and gasification excess
Blast takes and environmental pollution, to realize the high-acruracy survey of liquid natural gas gasification rate, save the cost and reduce ring
Border pollution.
Detailed description of the invention
Fig. 1 is a kind of liquid natural gas gasification rate measuring circuit figure of the utility model.
Appended drawing reference: 12- vaporizer；13- flow velocity compensates resistance；14 amendable precision resistances；15- precision resistance；16-
Bridge balance potentiometer；17- thermistor；18- galvanometer；19- potentiometer；20- adjustable voltage power supply；21- integrated circuit.
Specific embodiment
The utility model is described in detail with reference to the accompanying drawings of the specification.
As shown in Figure 1, a kind of liquid natural gas gasification rate measuring circuit provided by the utility model, including bridge circuit
And control circuit, bridge circuit by inside testing liquid natural gas gasifying room 12 thermistor 17 and flow velocity compensation resistance 13 with
And the precision resistance 15 and amendable precision resistance 14 of the meter body interior of connection vaporizer 12 form；Thermistor 17
Resistance value change in liquid natural gas gasification with the variation of gasification rate, keep bridge circuit uneven；Temperature-sensitive electricity
Resistance 17 makes to keep constant temperature and resistance value constant according to the control signal that the control circuit received issues, and bridge circuit is made to restore flat
Weighing apparatus；Flow velocity compensates resistance 13, and according to liquid natural gas, itself resistance value is adjusted in the difference of gasification rate in gasification,
The change in resistance that compensation thermistor 17 occurs in liquid natural gas gasification, makes bridge circuit restore balance.
Optionally, control circuit is made of input terminal and output end, wherein input terminal includes being integrated in meter ontology
The adjustable voltage power supply 20 of the integrated circuit 21 in portion and the power supply size for adjusting bridge circuit, integrated circuit 21 is for controlling
Outputting and inputting for bridge circuit, amplifies output signal, while being converted to digital signal；Output end includes for measuring
The potentiometer 19 of 15 both end voltage size of precision resistance, the bridge balance potentiometer 16 for adjusting the bridge circuit balance of voltage,
And for measuring the galvanometer 18 for flowing through 15 liang of bridge arm size of current of thermistor 17 and precision resistance.
Optionally, during liquefied natural gas gasifying, thermistor 17 is warm with the quickening of liquefied natural gas gasifying rate
Degree decline and resistance value become smaller, and keep bridge circuit uneven；Bridge balance potentiometer 16 exports unbalanced signal to integrated circuit 21,
Integrated circuit 21, which amplifies unbalanced signal and is converted to digital signal, is output to adjustable voltage power supply 20 and galvanometer 18,
Adjustable voltage power supply 20 and galvanometer 18 feed back digital signal inhibits the temperature of thermistor 17 to change to bridge circuit, and
The change in resistance that resistance 13 compensates thermistor 17 is compensated by flow velocity, makes thermistor 17 keep constant temperature and resistance value constant, makes
Bridge circuit restores balance, wherein the gas of thermistor 17 and precision resistance 15 liang of bridge arm size of current and liquefied natural gas
It is directly proportional to change rate.
Optionally, the temperature difference of the temperature of thermistor 17 and flow velocity compensation resistance 13 is definite value.
Optionally, precision resistance 15 is connected with thermistor 17, and the voltage swing at 15 both ends of precision resistance is as liquid day
The output signal of right gas gasification rate size.
Optionally, flow velocity compensation resistance 13 is integrated by series and parallel compensated resistance, and one of resistance is temperature-sensing element (device), temperature
Sensing element be arranged in flow field identical with thermistor 17, and with the temperature coefficient having the same of thermistor 17.
Optionally, temperature-sensing element (device) is made of the coil with larger area.
Optionally, in bridge circuit, the resistance value of precision resistance 15 is 100 Ω；The resistance value of amendable precision resistance 14
Range is 0-200 Ω；The water triple point resistance that thermistor 17 passes through thermometer measure is (100 ± 1) Ω；Flow velocity compensates resistance
The 13 water triple point resistance for passing through thermometer measure are (25 ± 1) Ω.In addition, those skilled in the art can also be according to practical need
It asks, chooses suitable resistance, the utility model does not limit this.
Optionally, the resistance wire of thermistor 17 uses platinum wire material.
The technical solution of the utility model in order to facilitate understanding below carries out the technical solution of the utility model detailed
It introduces.
Arrange that thermistor 17, liquefied natural gas become gaseous process from liquid evaporation and take away in liquefied natural gas gasifying room
Heat and decline 17 temperature of thermistor, liquefied natural gas gasifying rate is faster, then take away that heat is more, thermistor 17
Temperature decline is more.An arm of the thermistor 17 as electric bridge, it is the resistance with positive temperature coefficient, at a temperature of
Then resistance value becomes smaller when drop, and becoming smaller for resistance value causes bridge circuit uneven at this time.When bridge circuit imbalance occurs, electricity
Bridge balanced voltage meter 16 inputs unbalanced signal to integrated circuit 21, and integrated circuit 21 is amplified and converted to unbalanced signal
Being output to adjustable voltage power supply 20 and galvanometer 18 for digital signal makes thermistor 17 keep constant temperature, to reach thermistor 17
Resistance value is constant and bridge circuit is made to restore balance, if gasification rate increases at this time, electric current increases；Gasification rate reduces, then
Electric current reduces.
Wherein, the temperature difference of the temperature of thermistor 17 and flow velocity compensation resistance 13 is definite value, is controlled under normal circumstances
At 100 DEG C, when the thermistor 17 added with electric current is placed in flow field, due to fluid-flow relation, 17 temperature of thermistor
It changes, this change immediately results in electric bridge and deviates balance, to export unbalanced signal, the unbalanced signal is amplified
It feeds back in bridge circuit, to inhibit the temperature of thermistor 17 to change, the variation of 17 resistance of thermistor is compensated, to make electricity
Bridge circuit restores balance.
Control process is as follows: when the flow inside vaporizer 12 increases, 17 temperature of thermistor is reduced, thermistor 17
Resistance value reduces, and the voltage between thermistor 17 and flow velocity compensation resistance 13 decreases；Thermistor 17 and flow velocity compensation electricity
The load voltage that the reduction of voltage causes servo amplifier between resistance 13 increases, so that 17 both end voltage of thermistor be made to increase
Add；So as to cause the increase of bridge voltage；The increase of bridge voltage causes to increase by the electric current of thermistor 17, then adds again
The temperature-sensing element (device) that hot thermistor 17 is internally integrated, so that thermistor 17 and flow velocity be made to compensate the voltage between resistance 13
It increases, reduces 17 both end voltage of thermistor, bridge circuit is made to restore balance.
Precision resistance 15 is connected with thermistor 17, and the electric current of series circuit is equal, and the electric current of thermistor 17 equally flows
At this moment power cathode through precision resistance 15 generates a voltage, the variation of this voltage swing and electricity on precision resistance 15
Stream size variation is directly proportional and gasification rate variation is directly proportional.The voltage swing at 15 both ends of precision resistance is as gasification rate
The output signal of size.
In the case where liquefied natural gas gasifying amount is constant, when gas flow rate is different, the heat taken away from thermistor 17
Amount is also different, therefore compensates resistance 13 using flow velocity in bridge circuit.Flow velocity compensation resistance 13 is arranged in liquefied natural gas
In pipeline after gasification, the change in resistance of flow velocity compensation resistance 13 changes as gasification rate changes, to change electric bridge electricity
Road balance, measurement error caused by keeping flow velocity different are compensated, to guarantee the accuracy of measurement.
Flow velocity compensation resistance 13 is integrated by series and parallel compensated resistance, and one of resistance is temperature-sensing element (device), it is set
In flow field identical with thermistor 17, and with the temperature coefficient having the same of thermistor 17.Manufacturing the upper temperature
Sensing element is made of the coil with larger area.When known to the resistance value of series and parallel compensated resistance, voltage guarantor can be extrapolated
Hold the resistance value of constant series resistance and parallel resistance.
The utility model be directed to liquefied natural gas gasifying during, how the size of accurate perception amount of vaporization, provide one
Kind liquid natural gas gasification rate measuring circuit can be caused in gasification by temperature change by detecting liquefied natural gas
Resistance variation mode, the size of the gasification rate of liquid natural gas is accurately measured indirectly, passes through adjusting
The electric bridge due to caused by the variation of gasification rate is uneven, keeps the electric bridge rate recovery that restores balance and gasify normal, thus reality
Now liquefied natural gas gasifying process is precisely controlled.The measuring circuit that the utility model uses is simple and reliable for structure, measures model
Enclose wider, and measurement accuracy is higher, can prevent liquid natural gas gasification it is insufficient cause it is natural caused by failure and gasification excess
Blast takes and environmental pollution, to realize the high-acruracy survey of liquid natural gas gasification rate, save the cost and reduce ring
Border pollution.
The utility model is not limited to above-mentioned preferred forms, and anyone should learn that under the enlightenment of the utility model
The structure change made, it is all that there is same or similar technical solution with the utility model, each fall within the guarantor of the utility model
Within the scope of shield.
Claims (6)
1. a kind of liquid natural gas gasification rate measuring circuit, which is characterized in that including bridge circuit and control circuit, the electricity
Bridge circuit compensates resistance by the thermistor and flow velocity of testing liquid natural gas gasifying chamber interior and connects the vaporizer
The precision resistance of meter body interior and amendable precision resistance composition；The resistance value of the thermistor is in liquid natural gas
Change in gasification with the variation of gasification rate, keeps bridge circuit uneven；The thermistor is according to receiving
The control signal that the control circuit issues makes to keep constant temperature and resistance value constant, and bridge circuit is made to restore balance；The flow velocity is mended
Repaying resistance, itself resistance value is adjusted in the difference of gasification rate in gasification according to the liquid natural gas, described in compensation
The change in resistance that thermistor occurs in liquid natural gas gasification, makes bridge circuit restore balance；
The control circuit is made of input terminal and output end, wherein input terminal includes being integrated in the meter body interior
Integrated circuit and the power supply size for adjusting the bridge circuit adjustable voltage power supply, the integrated circuit is for controlling
Outputting and inputting for the bridge circuit, amplifies output signal, while being converted to digital signal；Output end includes being used for
Measure the potentiometer of the precision resistance both end voltage size, the bridge balance electricity for adjusting the bridge circuit balance of voltage
Pressure is counted and for measuring the galvanometer for flowing through two bridge arm size of current of the thermistor and precision resistance.
2. liquid natural gas gasification rate measuring circuit as described in claim 1, which is characterized in that the thermistor with
Liquefied natural gas gasifying rate changes and temperature and change in resistance occurs, and keeps the bridge circuit uneven；The bridge balance
Potentiometer exports unbalanced signal to the integrated circuit, and the integrated circuit is amplified and converted to the unbalanced signal
It is output to the adjustable voltage power supply and galvanometer for digital signal, the adjustable voltage power supply and galvanometer believe the number
Number feedback arrive the bridge circuit, inhibit the temperature of the thermistor to change, and by the flow velocity compensation resnstance transformer institute
The change in resistance for stating thermistor makes the thermistor keep constant temperature and resistance value constant, the bridge circuit is made to restore balance,
Wherein, the thermistor and two bridge arm size of current of precision resistance are directly proportional to the gasification rate of the liquefied natural gas.
3. liquid natural gas gasification rate measuring circuit as claimed in claim 2, which is characterized in that the precision resistance and institute
State thermistor series connection, output of the voltage swing at the precision resistance both ends as the liquid natural gas gasification rate size
Signal.
4. liquid natural gas gasification rate measuring circuit as claimed in claim 3, which is characterized in that the flow velocity compensates resistance
Integrated by series and parallel compensated resistance, one of resistance is temperature-sensing element (device), temperature-sensing element (device) setting with the temperature-sensitive
In the identical flow field of resistance, and with thermistor temperature coefficient having the same.
5. liquid natural gas gasification rate measuring circuit as claimed in claim 4, which is characterized in that the temperature-sensing element (device)
It is made of the coil with larger area.
6. liquid natural gas gasification rate measuring circuit as claimed in claim 4, which is characterized in that in the bridge circuit
In, the resistance value of the precision resistance is 100 Ω；The Standard resistance range of the amendable precision resistance is 0-200 Ω；The temperature-sensitive
The water triple point resistance that resistance passes through thermometer measure is (100 ± 1) Ω；The flow velocity compensation resistance passes through thermometer measure
Water triple point resistance is (25 ± 1) Ω.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821047158.4U CN208596126U (en) | 2018-06-29 | 2018-06-29 | A kind of liquid natural gas gasification rate measuring circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821047158.4U CN208596126U (en) | 2018-06-29 | 2018-06-29 | A kind of liquid natural gas gasification rate measuring circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN208596126U true CN208596126U (en) | 2019-03-12 |
Family
ID=65602349
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201821047158.4U Expired - Fee Related CN208596126U (en) | 2018-06-29 | 2018-06-29 | A kind of liquid natural gas gasification rate measuring circuit |
Country Status (1)
| Country | Link |
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| CN (1) | CN208596126U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117147449A (en) * | 2023-08-28 | 2023-12-01 | 国网江苏省电力有限公司扬州供电分公司 | Transformer oil gas measurement system and method based on bridge |
-
2018
- 2018-06-29 CN CN201821047158.4U patent/CN208596126U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117147449A (en) * | 2023-08-28 | 2023-12-01 | 国网江苏省电力有限公司扬州供电分公司 | Transformer oil gas measurement system and method based on bridge |
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| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20190312 |