CN102023035A - Gas flowmeter - Google Patents
Gas flowmeter Download PDFInfo
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- CN102023035A CN102023035A CN2009100188791A CN200910018879A CN102023035A CN 102023035 A CN102023035 A CN 102023035A CN 2009100188791 A CN2009100188791 A CN 2009100188791A CN 200910018879 A CN200910018879 A CN 200910018879A CN 102023035 A CN102023035 A CN 102023035A
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Abstract
The invention relates to a flowmeter, especially relates to a gas flowmeter which comprises a thermal resistor installed on gas pipelines and a flow sensor with a ball valve. The invention is characterized in that: the thermal resistor and the flow sensor with a ball valve are respectively connected with a flow integrating controller; the flow sensor with a ball valve is connected with low pressure steam pipes which are each provided with an explosion-proof solenoid valve; an intermediate relay is installed between the flow integrating controller and the explosion-proof solenoid valve. The invention is provided with a high temperature steam purging interface and the sensor can endure a high temperature of 400 DEG C. The invention has the advantages that it can reach a measurement precision of 1%; can measure the flows of saturation gas and dry gas therein through a special temperature press compensation model, and can realize the conversion between saturation gas flow and dry gas flow.
Description
(1) technical field
The present invention relates to a kind of flowmeter, particularly a kind of gas flow meter.
(2) background technology
One, general introduction:
Factory is called highly difficult gas with coke-oven gas by the flow instrument industry.
Factory is a kind of mixed gas with coke-oven gas, owing to wherein contain moisture, be known as " saturated coal gas " again, its moisture changes with variation of temperature, thereby causes the measured medium component constantly to change, and this has run counter to the design basis of common flowmeter " the measured medium component is stable ", therefore, the flow of measuring in the upstream and downstream of same pipeline often has a long way to go, and causes technology controlling and process Different Results to occur in Various Seasonal, and the clearing both sides also usually send out into dispute for this reason.
The tar fog that contains in the coke-oven gas, naphthalene steam etc. all can be attached on and cause measurement malfunctioning on the flow sensor, especially directly influence control and clearing.
Accumulated multidigit expert's achievement, through several years research and test, CH series coal gas flow meter specially has solved this difficult problem up hill and dale.
The characteristics of two coke-oven gas
Coke oven dry gas component under the 1 mark condition
H
2-----------------54～59％；
CH
4--------------23～29％；
CO---------------5.5～8％；
C
nH
m------------2～4％；
CO
2--------------1.5～3％
N
2------------------3～7％；
O
2-------------------0.3～0.8％；
Other------(comprising H2S, HCN etc.)
Coke oven dry gas density under the 2 mark conditions
Because the difference of coal blending and operating duty, the component of each coal chemical enterprise institute producing coal gas constitute slightly different, dry gas density is generally at 0.45～0.52kg/m
3Between.
With regard to a metastable coal chemical enterprise of production, said components and density are metastable, and density is an important parameter in the flow measurement.
3 contain the saturated coal gas of moisture
Moisture is contained with coke-oven gas in factory, is called " saturated coal gas ", and its moisture is directly related with temperature, as: 1m in the time of 0 ℃
3Dry gas is after water-vapo(u)r saturation, and moisture is 19.1g/m in the time of 20 ℃
3, volume is 1.098m
3Moisture is 35.2g/m in the time of 30 ℃
3, volume is 1.158m
3
Under the operating mode situation, coke-oven gas all belongs to saturated coal gas, and this is to be determined by the special process that coke-oven gas produces.
Therefore, often gap is bigger for the gas flow that the different pipe sections on same gas piping is measured, and the trade both sides usually produce contradiction for this reason.
4 tar fogs directly influence measuring accuracy
Tar fog in the coke-oven gas is generally at 20～50mg/m
3Between, time one length will be attached on the sensor, makes flowmeter lose its measuring accuracy, and especially when electrical tar precipitator broke down, tar sticks can become very serious.
5 low flow restriction
Coke-oven gas is to rely on blower fan to carry, and in order to reduce power of fan and power consumption, it is thicker that gas piping generally designs, and the coke-oven gas flow velocity is often lower.
As certain large-scale coke-oven plant the coal gas multi-purpose station pipeline of a DN800 is arranged, estimate that the minimum flow of coal gas is 5000Nm
3/ h, maximum flow is 50000Nm
3/ h, pressure 8KPa, temperature changes between 10～40 ℃.
Suppose that the coke-oven gas component that this enterprise produces is the intermediate value of above-mentioned data, the system of equations that provides according to China National Petroleum Corporation's SY/T6143-2004 standard, can calculate some very significant data, we can judge the on-the-spot often selected applicability of measuring several flowmeters of gas flow in view of the above:
1. calculate and learn: dry gas that this enterprise produces mark condition density is 0.458kg/m
3, the density of saturated coal gas is 0.465kg/m under the mark condition
3
If 2. select pressure reduction class flowmeter for use, at present, the pressure difference signal that best differential pressure transmitter can accurately be measured is 40Pa, is minimum flow 5000Nm below
3/ differential pressure value of hour correspondence and the differential pressure value corresponding flow numerical value of 40Pa:
Obviously, it is inappropriate selecting the differential pressure type flowmeter for use, although the lower limit flow velocity of orifice plate and V-arrangement cone flow meter is smaller, the orifice plate crushing is very big, and exists the tar that is difficult to overcome to stick problem, though V-arrangement awl lower limit flow is approaching, has bigger crushing.
In addition, common flowmeter and flow integrator all adopts desirable equation of gaseous state group at present, and it is its precondition that tested gas must have stable component, does not consider the influence of change of soil water content to component, measure coal gas class gas flow, all have the bigger error of calculation.
3. the Karman vortex street flowmeter is a kind of speed mode flow instrument, and gas speed directly determines its usability, and the gas speed during this measuring point minimum flow is 2.64m/s.
At present, the sensor of vortex shedding flow meter has two kinds of piezoelectric type and condenser types, and the gas lower limit flow velocity that piezoelectric type can be measured is about 5m/s, and the lower limit flow velocity that condenser type can be measured is about half of piezoelectric type.
With regard to this measuring point, selecting capacitance vortex flowmeter for use is preferably, though may be not accurate enough near the lower limit flow velocity time, error is little;
4. the direct mass rate of measurement gas of caloic formula mass-flow gas meter, its principle is that the speed of fluid absorbent thermal is directly relevant with mass rate.The precision height, the lower limit flow velocity is not less than 0.2m/s just can realize accurate measurement, is particularly suitable for the flow measurement of coke-oven gas.
But common caloic formula mass-flow gas meter (no matter import still is homemade) can only detect the flow of pure gas or common mixed gas (as air) at present, measures gas flow and need accurately know the component of all gases in the coal gas and the heat flow characteristic of this mixed gas.
All over the research data of looking into associated mechanisms, so far lack systematic Study for various gas flows, especially the heat flow characteristic research to various coal gas almost is a blank, the mass-flow gas meter measurement result that present each enterprise selects for use is actually a kind of experience tune-up data, especially when temperature variation was big, its measurement result was just very inaccurate.
(3) summary of the invention
The present invention provides a kind of measurement result gas flow meter accurately in order to remedy the deficiencies in the prior art, and this flowmeter both can have been measured saturated gas flow, also can measure the dry gas flow.
The present invention is achieved through the following technical solutions:
A kind of gas flow meter comprises the thermal resistance and the dribbling valve flow sensor that are installed on the gas piping, and its special character is: described thermal resistance is connected with the flow accumulation controller respectively with dribbling valve flow sensor.
Gas flow meter of the present invention, it further improves and is: connecting on the described dribbling valve flow sensor has the low-pressure steam pipeline, and the low-pressure steam pipeline is provided with explosion-proof solenoid valve, between flow accumulation controller and the explosion-proof solenoid valve auxiliary reclay is installed.
Gas flow meter of the present invention is equipped with pressure unit on the described gas piping, and pressure unit is connected with the flow accumulation controller.
The present invention is furnished with high-temperature steam and purges interface, and sensor can tolerate 400 ℃ of high temperature, has the following advantages:
(1) measuring accuracy 1%.
(2) by exclusive temperature and pressure compensation model, can measure saturated gas flow and dry gas flow wherein, have saturated gas flow and dry gas flow translation function simultaneously.
(3) purge by the timing of setting, can guarantee the sensor long-term stable operation, purging vapour inlet is φ 8 stainless steel pipes, adopts movable threaded cutting ferrule to be connected with steam pipe.
(4) installation dimension: need be not less than 100 patchholes on gas piping, straight length requires: upstream 10D, downstream 5D.
(5) have online plug function, all be furnished with mounting ball valve, easy to maintenance.
(4) description of drawings
The present invention is further illustrated below in conjunction with accompanying drawing.
Fig. 1 is a kind of specific embodiment of the present invention;
Fig. 2 is an another kind of specific embodiment of the present invention.
Among the figure, 1 dribbling valve flow sensor, 2 pressure units, 3 thermal resistances, 4 flow accumulation controllers, 5 explosion-proof solenoid valves, 6 auxiliary reclays, 7 low-pressure steam pipelines, 8 gas pipings.
(5) embodiment
Embodiment 1:
Fig. 1 is a kind of specific embodiment of the present invention.This embodiment comprises thermal resistance 3 and the dribbling valve flow sensor 1 that is installed on the gas piping 8, and thermal resistance 3 is connected with flow accumulation controller 4 respectively with dribbling valve flow sensor 1; Connecting on the dribbling valve flow sensor 1 has low-pressure steam pipeline 7, and low-pressure steam pipeline 7 is provided with explosion-proof solenoid valve 5, between flow accumulation controller 4 and the explosion-proof solenoid valve 5 auxiliary reclay 6 is installed; Pressure unit 2 is installed on the gas piping 8, and pressure unit 2 is connected with flow accumulation controller 4.
This coal gas flow meter specially is the discharge characteristic of the applicant according to coke-oven gas, through the high-tech product with innovation of several years research release.
The basic comprising of coal gas flow meter specially is as follows:
1 coke-oven gas special flow integrating controller
This is a high-precision liquid crystal display instrument, integrates intelligent flow-integrating instrument and purges controller, both can measure saturated gas flow, also can measure the dry gas flow, has saturated gas flow and dry gas flow translation function simultaneously.
Bore size is 160x80, is fit to card and installs, and as installing near near the wall hanging pipeline of sensor, needs to be equipped with special-purpose explosion-proof control box.
Have 4-20mA and RS485 output function.
With flow sensor and the supporting use of flow sensor, constitute gas flow meter.
2 coke-oven gas special flow sensors
Flow sensor is to research and develop to form on the applicant's intelligent capacitance vortex shedding flow meter basis, whole advantages with capacitance vortex flowmeter, selected import condenser type flow sensor, through modulation meticulously, measurable flow speed surpasses the saturated gas flow of 2.5m/s.
The present invention is furnished with high-temperature steam and purges interface, and sensor can tolerate 400 ℃ of high temperature, with the supporting composition gas flow meter of flow accumulation controller of the present invention.
(1) measuring accuracy 1%.
(2) by exclusive temperature and pressure compensation model, can measure saturated gas flow and dry gas flow wherein, have saturated gas flow and dry gas flow translation function simultaneously.
(3) purge by the timing of setting, can guarantee the sensor long-term stable operation, purging vapour inlet is φ 8 stainless steel pipes, adopts movable threaded cutting ferrule to be connected with steam pipe.
(4) installation dimension: need be not less than φ 100 patchholes on gas piping, straight length requires: upstream 10D, downstream 5D.
(5) have online plug function, all be furnished with mounting ball valve, easy to maintenance.
3 automatic blowout devices
The coal gas flow meter specially all is furnished with automatic blowout device, to prevent tar fog sticking sensor.
Purging control device is made up of flow accumulation controller and an explosion-proof solenoid valve.Purge at interval and can select (1/2/4/8/12/24 hour adjustable) voluntarily, each purge time is 5-40S (adjustable), and has the signal of purging maintenance function, and experimental results show that does not influence measurement effect and control effect.
Calculating of the present invention basis:
The flow equation group of 1 specialty
There is multiple computation model can be used for the flow rate calculation of mixed gas, common flowmeter and flow integrator all adopt desirable equation of gaseous state, the calculating that is used to control purpose can obtain required precision, but higher if desired precision (as Trade Measures), the system of equations that must adopt China National Petroleum Corporation's SY/T6143-2004 standard to provide.
Flow accumulation controller of the present invention has adopted this system of equations just.
By display panels the correlation parameter of coal gas is imported flow accumulation controller of the present invention, can provide accurately and calculate.
2 adapt to the design basis that changes
Common flowmeter and flow integrator are measured mixed gas an important design basis: the component of tested gas must be stable.
But because coke-oven gas belongs to saturated coal gas, moisture wherein changes with variation of temperature, and this has just broken the design basis of common flowmeter, therefore also can not provide accurately and measure.
The temperature and pressure compensation model that flow accumulation controller of the present invention is exclusive has taken into full account the influence of moisture content change to the coke-oven gas discharge characteristic, thereby has guaranteed the accurate measurement to the coke-oven gas flow.
3 explanations
Coke-oven gas special flow integrating controller of the present invention can with the supporting use of multiple on-the-spot flowmeter, as V-arrangement prick flow transducer, Verabar flowmeter or the like, flowmeter and flowmeter all belong to special flowmeter, as selecting coke-oven gas special flow integrating controller separately for use, the type of the on-the-spot flowmeter of mandatory declaration during order.
Embodiment 2:
Fig. 2 is a kind of specific embodiment of the present invention.This embodiment comprises thermal resistance 3 and the dribbling valve flow sensor 1 that is installed on the gas piping 8, and thermal resistance 3 is connected with flow accumulation controller 4 respectively with dribbling valve flow sensor 1; Connecting on the dribbling valve flow sensor 1 has low-pressure steam pipeline 7, and low-pressure steam pipeline 7 is provided with explosion-proof solenoid valve 5, between flow accumulation controller 4 and the explosion-proof solenoid valve 5 auxiliary reclay 6 is installed.
Flow sensor of the present invention is to research and develop to form on intelligent caloic formula mass-flow gas meter basis, be that sensor of unique a usefulness both can be measured utmost point low discharge in the present all gas flowmeter, also can measure the on-the-spot flow instrument of high flow, whole advantages with caloic formula mass-flow gas meter, measurable flow speed is at 0.2 meter/ saturated gas flow more than the S.
The present invention is furnished with high-temperature steam and purges interface, and sensor can tolerate the high temperature more than 700 ℃, with the supporting composition of flow accumulation controller gas flow meter of the present invention.
(1) measuring accuracy 1%.
(2) by exclusive temperature and pressure compensation model, can measure saturated gas flow and dry gas flow wherein, have saturated gas flow and dry gas flow translation function simultaneously.
(3) purge by the timing of setting, can guarantee the sensor long-term stable operation, purging vapour inlet is φ 8 stainless-steel tubes, adopts movable threaded cutting ferrule to be connected with steam pipe.
(4) perforate is installed: on gas piping, the patchhole that is not less than φ 25 need be arranged.
(5) have online plug function, all be furnished with mounting ball valve, easy to maintenance.
Claims (3)
1. a gas flow meter comprises the thermal resistance (3) and the dribbling valve flow sensor (1) that are installed on the gas piping (8), and it is characterized in that: described thermal resistance (3) is connected with flow accumulation controller (4) respectively with dribbling valve flow sensor (1).
2. gas flow meter according to claim 1, it is characterized in that: described dribbling valve flow sensor (1) is gone up to connect low-pressure steam pipeline (7), low-pressure steam pipeline (7) is provided with explosion-proof solenoid valve (5), between flow accumulation controller (4) and the explosion-proof solenoid valve (5) auxiliary reclay (6) is installed.
3. gas flow meter according to claim 1 and 2 is characterized in that: pressure unit (2) is installed on the described gas piping (8), and pressure unit (2) is connected with flow accumulation controller (4).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009100188791A CN102023035A (en) | 2009-09-14 | 2009-09-14 | Gas flowmeter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009100188791A CN102023035A (en) | 2009-09-14 | 2009-09-14 | Gas flowmeter |
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| Publication Number | Publication Date |
|---|---|
| CN102023035A true CN102023035A (en) | 2011-04-20 |
Family
ID=43864605
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2009100188791A Pending CN102023035A (en) | 2009-09-14 | 2009-09-14 | Gas flowmeter |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102840888A (en) * | 2012-09-03 | 2012-12-26 | 南京钢铁股份有限公司 | Coal gas flow measuring method based on heat value measurement |
| CN109632030A (en) * | 2018-11-06 | 2019-04-16 | 上海库科自动化科技有限公司 | A kind of municipal administration gas flow pressure monitoring system |
| CN110998246A (en) * | 2017-08-30 | 2020-04-10 | 施耐德电子系统美国股份有限公司 | Vortex flowmeter with injection cleaning port |
-
2009
- 2009-09-14 CN CN2009100188791A patent/CN102023035A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102840888A (en) * | 2012-09-03 | 2012-12-26 | 南京钢铁股份有限公司 | Coal gas flow measuring method based on heat value measurement |
| CN110998246A (en) * | 2017-08-30 | 2020-04-10 | 施耐德电子系统美国股份有限公司 | Vortex flowmeter with injection cleaning port |
| CN110998246B (en) * | 2017-08-30 | 2022-05-03 | 施耐德电子系统美国股份有限公司 | Vortex flowmeter with injection cleaning port |
| CN109632030A (en) * | 2018-11-06 | 2019-04-16 | 上海库科自动化科技有限公司 | A kind of municipal administration gas flow pressure monitoring system |
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Application publication date: 20110420 |