SU842333A1 - Method of gasificating liquefied gas with increased content of butane - Google Patents

Description

(54) METHOD OF LIQUEFIED GAS GASIFICATION WITH INCREASED BUTANE CONTENT

I

The invention relates to gas supply of household and industrial consumers with liquefied gas and to gas engineering.

The closest to the proposed method is the gasification of liquefied gas with a high butane content, including evaporation of gas in underground tanks by supplying heat to the gas from the ground 1.

In this method, in the winter period, gasification is mainly subjected to propane gas. Butane and other hardly vaporizable components of liquefied gas, due to their relatively high boiling point in vaporization, almost do not take part in & cosiness, accumulate in tanks and become a hindrance. So, if the boiling point of propane at a vapor pressure of 760 mm Hg. st is equal to -42, HS, then for butane it will be -0.6 ° C. With a vapor pressure of liquefied gas in tanks of 2 kgf / cm, the boiling point increases accordingly for propane to -35 ° C and for butane to 12 ° C. The soil temperature in winter at a depth of 1.2-1.5 m near the tanks of the installation can reach up to O - 2 ° C. So

Thus, the disadvantages of the method are fractional vaporization of liquefied gas in tanks, the need to periodically remove butane and other components of liquefied gas that are difficult to evaporate in winter time from tanks, variable heat of combustion of the gas mixture on the burners, abundant condensation, interruption of gas supply and violation of safety .

The purpose of the invention is to increase the vaporization of butane and other hard-to-evaporate components during the cold season by lowering their boiling point.

This goal is achieved in that saturated vapors from one reservoir pass in an amount of 1-1.5 through the liquid phase in another reservoir, thanks to which the moving vapor bubbles form boiling centers in the liquid phase itself, significantly lowering its boiling point.

With the passage of the liquid phase of a liquefied gas, vapor bubbles capture the molecules of butane and other components, as well as odorizing substances. Component gas; becoming a gas phase becomes stable

and sufficiently odorized, and the constant presence of propane vapor in it reduces the formation and accumulation in the low pressure gas pipeline and in the fittings of the condensate reducing unit, allows the installation to work stably at the minimum vapor pressure in its tanks (0.4 - 0.2 kgf / cm ).

The drawing shows a diagram of the implementation of the method.

The tanks 1 and 2 inside are equipped with level gauge tubes 3, filling tubes 4 and drainage tubes 5. Their necks are covered with covers 6 from above. Nozzles are welded into the covers: vapor-phase equalizing 7, vapor-phase consumables 8, filling 9, drainage 10, for safety valves and pressure gauges 11 for gage tubes (not shown) on which control, stop and safety valves are mounted, as well as instrumentation (not shown). Couplings 12 with flare nuts are welded to the vapor-phase balancing nozzles 7 and drainage 10, to which steam extraction pipes 13 are connected with medium pressure regulators 14, due to which the vapors from the filled tank in the amount of 1.0 - 1.5 are automatically adjusted. To turn off the pressure regulators during the discharge of liquefied gas from a tanker truck, if its vapor phase is connected to the vapor phase of the tank, as well as when the heavy fractions are removed from the tank, angular shut-off valves 15 are used. To prevent excessive freezing of the steam sampling tube 13, vapor-phase equalization pipes 17 and drainage 10 are covered with a layer of thermal insulation (not shown).

The method is implemented as follows.

During the next refueling of the installation, the liquefied gas is drained from the tanker into one of its tanks, for example, into tank 1. In this case, the pressure regulator of tank 2 is adjusted to a predetermined outlet pressure at a vapor pressure in this tank of 0.4 - 0.2 kgf / cm . The pressure regulator of tank 1 is adjusted to a slightly lower output pressure (by 20-40 mm water column), as it will be redundant. Then the valve on the vapor-phase equalizing pipe 7 of the tank 1 and the valve of the drain pipe 10 on the tank 2 are opened. At the same time, saturated propane-butane vapor from tank 1 when the angle valve is open 15 enters

to the medium pressure regulator 14 and after decreasing the pressure through the open shut-off valve on the drainage pipe to the lower end of the drainage pipe 5.

Next, saturated vapors pass the liquid phase of butane and other components of the liquefied gas, form additional centers of Kietzia in it, carry away their molecules, as well as odorizing substances, and together with the formed vapors of butane and other components, enter the vapor-phase space of the reservoir and further through the reducing unit to the gas pipeline of consumers. After regasification of butane from reservoir 2, the next filling with liquefied gas takes place. The reservoir becomes reservoir 1, and the operations will be similar to those described above. Using the proposed method of gasification of liquefied gas provides, in comparison with existing methods, advantages such as minor

 the cost of its implementation, the lack of operating costs, the simplicity of the process, increase the efficiency of gas appliances and increase safety measures during their production.

5 To introduce this method into the gas supply, only a minor additional device is required to the existing installations, which can be installed on their tanks without interrupting the gas supply to consumers.

Claims (2)

1. Gasification of liquefied gas with an increased butane content, including the evaporation of gas in underground tanks by supplying heat to the gas from the ground, characterized in that, in order to increase vaporization of coot and other hard-to-evaporate components during cold time Q year by lowering their boiling point, saturated vapors from one tank are passed through the liquid phase in another tank. 2. A method according to claim .1, characterized in that the flow rate of the passed vapor is maintained within the range of 1-1.5. Sources of information taken into account in the examination 1. Kolbenkov S.P. Installations of liquefied gas for household and industrial consumers. M., "Nedra, 1969, p. 92-120. 72 -P . / 73 Pw 15 12 73 / one . 12