SU705303A1 - Method of determining the quantity of gas and vapour - Google Patents

Description

(54) METHOD FOR DETERMINING QUANTITIES OF GAS AND STEAM

 . .. 1, - The invention relates to the chemical and oil and gas industry and can be used in all sectors of the national economy while simultaneously determining separate quantities that are integral in time; gas and vapor in discharged gas-vapor mixtures. The known volumetric method of determining the time-integral amount of the gas-gap product tl3 discharged from the tank does not allow sufficiently accurate determination of the separate quantities of vapor and gas discharged due to the possible effects of the separation of the initial vapor-gas mixture. Known manometric method of analyzing the composition of the gas mixture 2, including .brod mixture-; into the receiving tank and chemical or physical impact on the mixture, followed by measurement of pressure and temperature. The disadvantage of this method is the need for an appropriate effect, which requires an acting device, complicates the analysis and increases costs. The purpose of the present invention is to eliminate these drawbacks and improve the accuracy of determining the quantities of gas and steam by eliminating the separation of the vapor-gas mixture. This goal is achieved by the fact that, before discharge of the gas-vapor mixture / receiving tank, the analysis of the 1-1 gas is flushed and filled with liquid, which is saturated with the same gas. Before and after discharge, the pressure in both tanks is measured, the temperature is initial and final is measured in both and -the final pressure in the receiving tank; The initial amount of gas in the receiver is determined from the equation. p - gas cushion V;, priyuyu tank p; r Pressure t temperature before the start of the bypass in the cushion of the receiving tank; R ,. - gas constant of the pelvis. After equalizing the temperature of an ap.e1Oi tank, gas pressure in it pc. Pressure and temperature in the cushion of the receiving container after the temperature is equalized;

P is the vapor pressure of the liquid corresponding to the temperature T 5 at the saturation line. the amount of gas in the tank cushion after the bypass

.

GPC rV

and the required amount of gas left from the initial capacity

g-- gpk- glo-- (R-P-p

pc °

The initial gas pressure in the initial tank is the total pressure of the vapor-gas mixture in the pad of the original tank before the start of the bypass; P is the vapor pressure of the liquid corresponding to the temperature T | before the mixture in the heap of the initial container before the start of the bypass on the saturation line. The initial amount of gas in the supply of the original tank (P-P l oo 5C is the volume of the pillow in the original bone. The amount of gas in the pillow of the initial tank after 1 turn-off Tick. Two f The gas pressure in the pillow of the original tank after the bypass and here) - some effective temperature of the vapor-gas mixture in an unsuitable container after the end of the start-up. The total pressure of the vapor-gas mixture in the original tank and after the bypass of PM is the sum and Pg (T) is the vapor pressure of the liquid corresponding to the temperature T on the saturation line, t. e. P MO-PS -., o GG O here, the temperature T is determined, and then the vapor pressure of the liquid, corresponding to it on the saturation line.

The amount of steam in the original capacious; tee before pb; repusku

B

pio

where R (is the gas constant of vapor.

The amount of steam in the original tank after the bypass

Q

peak r

The required amount of stepped from the steam tank

- „

The main method is shown in the diagram, where 1 is the initial capacity, 2 is a relief valve, 3 is a drain valve, 4 is a receiving tank, 5 is a gas supply valve, .fi is a filling-drain valve, T is a temperature meter D - pressure meter. To implement the proposed method, it is necessary to perform the following operations: 1. Fill partially the receiving tank 4 through the valve with liquid, determining the volume of the gas cushion. 2. By supplying gas through the valve 5 with the drain valve 3 open, the liquid in the tank 4 is saturated with gas at a pressure that is expected in the receiving tank after the bypass. At the same time, the tank 4 is being purged, and the required pressure in it is determined by the moment the valve 3 is closed. 3. Measure the RPO pressure and temperature T f, o in the tank 4. 4. Measure the pressure g temperature Tu, p and the volume of the gas cushion / v) original capacity. 5. Turn on and off valve 2 to bypass the required amount of the gas-vapor mixture into the receiving tank. 6. Measure the pressure P in the capacitance tank 1 immediately after the bypass. 7. Measure the pressure P „and the temperature Tg, k in the tank 4 after the bypass, 8. Determine the gas constants of the desired gases R, - and the vapor Rp according to the appropriate tables of the physicochemical properties of the substances. 9. Determine the pressure of the elasticity of the vaporized vaporized particles f Psf corresponding to the temperatures T o on the saturation line for this fluid. 10. Determine the required amount of gas using the formula 11, the combined solution (graphically method) of the equation r, .t2e Т ТдСТ) - I МО "and the function of the elastic pressure of the liquid vapor in the liquid Pg (T) at the saturation line to determine the effective temperature T of the remaining vapor-gas mixture in the tank 1. 12. Determine the vapor pressure of the liquid Pg | corresponding to the temperature T on the saturation line. 13. To determine the required quantity of steam using the formula. Graphical solution of the system of two 20 corresponding equations gives 8-10 fA

The proposed method makes it possible to simultaneously determine the separate integral in time of the gas and steam in the steam-gas sm15si, eliminate the need for physical or chemical effects on the gas-vapor mixture, which simplifies the process equipment and reduces the cost of funds for this analysis, improve the accuracy of determining the quantities of gas and steam for by eliminating the effect of separation of the vapor-gas mixture. .

. . . . -,.; . invention formula

The method of determining the quantities of gas and vapor in the equilibrium system of the vapor-gas liquid, including filling the initial capacity with liquid, obtaining B / 396

 And h

4,416-2,2.aUo KG (M OR85KG b

her gas-vapor mixture and discharge the latter into the receiving tank q followed

measuring pressure and temperature, characterized in that, in order to improve the accuracy of determining the amounts of gas and steam by eliminating separation of the vapor-gas mixture, before discharge of the vapor-gas mixture, the receiving tank is flushed with an analyzable gas and filled with liquid

saturated with the same gas.

Information sources,

taken into account during the examination

1.Goronsky I.T. Quick Reference to Chemistry, Kiev, Naukova Dulzha, 1974. p. 706.

2. Chemist Handbook, volume IV, 2nd edition. L., HiMi, 1967,

with. 604-605 (prototype). M Vvrtew) Example. The amounts of gas and steam in the discharged mixture of water vapor and carbon dioxide were determined with the following data VM 3-10 1 10 m; RIO 5 8.0 kg / cm; 420 PS (THO) 4,476 kg / cm; P „c, 4.37 kg / Tpo 293; Р 2.03 kg / cm; PKK 2.83 kg / cm; Trk - R. s kg- m. “N KG-GraA -1.:, -3kg-GrabA Consequently, ,, o3) -2, oa Uo, rank T, equal to 395. Accordingly, Р„ (Т) is equal to 2.22 kg / cm.

705303

gas drain