Device for measuring the dew point temperature on the moisture in natural gas with a high content of higher hydrocarbons vapors

 

(57) Abstract:

The invention relates to the measurement of moisture in natural gas according to the method of determining the temperature of the dew point moisture (TTR for moisture ). A device that allows you to lower the content of vapors WU up until TTR by WU equal to TTR by moisture. This is achieved by setting before condensation hygrometer filter, which is a metal plate that is cooled using a thermoelectric device to a temperature upper limit value of TTR by moisture, i.e., to the value where T is the measurement error Spending consecutive measurements on TTF moisture and clarifying the temperature, which must be installed on the condensing plate, achieve a significant reduction in measurement error TTR by moisture. The technical result - the reduction of measurement error. 2 Il.

The invention relates to a measurement technique, namely the moisture measurement in natural gas by the method of determining the dew point temperature.

When determining natural gas condensing hygrometer to measure the temperature of the cooled metal mirror in the moment when it begins to condense is and absolute humidity of the gas.

This method is implemented in many condensing appliances: Kharkov-1, Dewscope, Anaconda, ASC-214, Bovar and others [1].

Condensation hygrometers measure π on moisture reasonably well if the temperature drops mirrors first starts to condense water. However, if the gas contains more pairs of propane, butane, pentane and other higher hydrocarbons, cooling the mirror will be the first to fall condensates WU. Such a situation is realized in most cases: TTP by WU (TrINY) lies above the TTR on the water at 310oWith [2], [3].

The definition of TTP on the moisture will be produced with great accuracy [4], [5]. This is due to the fact that the optical properties of WU and water is close and to distinguish the formation of a film of water on the film WU (which is also simultaneously increased in thickness due to the continuous condensation WU) is difficult, and often impossible. A particularly difficult situation on the underground gas storage (UGS), which is based on the former gas condensate fields - there TrINYexceeds 1015oC, so that even the newest condensing devices are unstable and, if determined to bait condensation hygrometer, connected with the atmosphere through the valve, and is the closest to the technical nature of the claimed device and can be used as a prototype.

Solved technical problem is a device that allows you to lower the dew point is higher hydrocarbons to a temperature dew point humidity and thereby to provide a measurement of the dew point temperature on the moisture with low accuracy and greater reliability.

The problem is solved as follows.

A device for determining TTR by moisture in natural gas contains a condensation hygrometer, the output of which is connected with the atmosphere through the valve. What is new is the fact that additionally introduced the condensation filter, comprising a housing in which are located thermal device, which directly installed metal plate, the surface of which is mounted a temperature sensor, while above the surface of the cover plate is installed from a material with low heat conductivity with the formation of a channel for the passage of the gas over the plate, added adjustable power source of the condensation filter, whose input is connected to the gas path through the ATA higher hydrocarbons.

In Fig. 1 presents a functional diagram of the inventive device of Fig. 2 - design of the condensation filter.

Device for measuring TTR by moisture in natural gas contains the inlet valve 1, the condensation filter 2 having two outputs 3 and 4, the bracket 5, the output valves 6 and 7, the flowmeter 8 and the power source 9. Condensation filter of Fig. 2 consists of a housing 10 (shown dashed), which are thermal device 11, on which is located the plate 12 and the temperature sensor 13, and a lid made of a material with low thermal conductivity 14, which created a channel for the passage of gas 15. The housing 10 is designed to withstand a working pressure of gas in the pipeline.

The operation of the device is as follows.

Opening the valve 1, which is filled condensation filter 2 and hygrometer 5 to the working pressure. Then through valve 6 and rotameter 8 installed gas flow (usually within 0,10,3 l/min). After that, by using a hygrometer 5 define the features of interest gas, namely: TTP by WU (Tr1INYand TTP for moisture

When this check TrINYwill be conducted with a small error, because condensee will be carried out with greater accuracy, since the beginning of the condensation of water will occur on the background of already existing film of condensate WU, which is also constantly growing, because right condition is significantly lower TrINY.

Let us denote the first approximation in the value of TTR in the moisture as the error in its measurement as so the true value is enclosed between values and

Condensation filter 2 when these measurements were not included and the temperature of the plate 12 is equal to the ambient temperature.

Next, clean the hygrometer, raising the temperature of the plate 12 to the ambient temperature or slightly above; it fell on the mirror condensate WU and water evaporates and is carried away by the flow of gas, which at the time of cleaning can be increased by a valve 7.

Then start the next measurement. Include unit 9 and by adjusting the set current through thermal device 11 such that the temperature of the plate 12 has become equal to the upper possible limit of TTR by moisture, i.e.

< / BR>
The analyzed gas temperature Tg, slowly passing over the plate 12, is cooled to a temperature THOL1or close to it (the length and width of the plate 12, the height of the cover 14 and the speed of the duct So as THOL lies below TrINYthen on the plate 12 will begin to fall out of the liquid hydrocarbon condensate and at the output of the filter 2, the gas acquires a new value of TTR by WU, namely TrINY= THOL1. The rolled plate 12 condensate WU dripping from her lowest point at the base of the power block 10, where from time to time it is removed through the valve 7.

Again measured with a hygrometer 5 TTR by moisture. Due to the fact that part of the vapor WU condense in the filter 2, the vapor WOO coming on the analysis in hygrometer 5 became less: TTR on WU decreased and was equal to TrINU2< Tp1INY. The thickness of the film of condensate WU at achievement on the measuring mirror values significantly decreased, i.e. the conditions of registration on TTF moisture has improved significantly, and will be defined with a significantly smaller error. Let after the second measurement hygrometer 5 gives values:

TTP on WU: TpWU= TpWU2= THOL1;

TTR on moisture:

if this

The true value lies in the interval between

< / BR>
After the second measurement TTR by WU and moisture hygrometer 7 is cleaned as described above, mounted on the plate 12 temperature equal to the upper limit of TTR on VEGALOG temperature change plate 12 THOL and measurement of TTR by WU and moisture To repeat again - until the temperature values TRKINYand equal (within measurement errors). This means that water vapor and a pair of WU are condensed at the same time. Thus the error in the determination of TTP for the moisture to a minimum.

Practice shows that usually it's enough to hold two or three dimensions, i.e., K3.

A device for determining TTR for moisture when TrINYexceeds 1020oWith has been tested in laboratory conditions. Adjustment Thal and its stabilization during the measurement was carried out manually by an operator. As WU used a pair of pentane. TTR on the moisture was installed generator dew point is +5+1oC.

Measurements have shown that the error in the determination of TTP for moisture using this device in the presence of WU and in their absence vary slightly by 1 2oWith that enables you to recommend it to determine TTR for moisture conditions when TrINYsignificantly exceeds

Sources of information

1. Khalifa A. L., Turevskiy E. I., roly-poly centuries, Sugars Century, that is, the machine P. I. Instruments for determining the moisture content of the gas. M: IDC Gazprom, 1995, 45 S.

2. Gases flammable nature, singing dew point of natural gas. Hygrometers with a cooled surface. International standard ISO 6321-81, 1984, 9 S.

4. Plejaden C. P., Tkachenko M. F., Silver, J. M. Methodological aspects of determining the dew point of natural combustible gases. In Proc. of the all-Union scientific-technical conference "batch bogie-89". , Kharkov, 1989, S. 209-214.

5. Moskalev, I. N., Bityukov B. C., Filonenko A. S., Gavrilin A. K., Fedosov C. M., N. Efremenko.A. Bloomeria natural gas: state and problems. M: IDC Gazprom, 1999, 36 C.

Device for measuring the dew point temperature on the moisture in natural gas with high content of vapors of higher hydrocarbons containing condensation hygrometer, the output of which is connected with the atmosphere through the valve, characterized in that it further introduced the condensation filter, comprising a housing in which are located thermal device, which directly installed metal plate, the surface of which is equipped with a cover made of a material with low heat conductivity with the formation of a channel for the passage of the gas over the plate, added adjustable power source of the condensation filter, whose input is connected to the gas path through the valve, a first output connected to whodo

 

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