SU757807A1 - Plant for storing and supplying liquefied domestic gas - Google Patents

Description

The invention relates to the use of gas with a high content (up to 60%) of butane for household purposes.

Physical properties of liquefied. gas from soil

higher butane content is significantly different from the properties of gases with a predominance of propane. First of all, this refers to the vapor pressure of liquefied gases. To maintain the performance of liquefied gas installations and transport its vapor to the consumer, it is necessary to have a certain minimum pressure of these vapor before the pressure regulator.

The vapor pressure of a liquefied gas that is in equilibrium with the liquid phase depends on both the composition of the gas and its temperature. ,

So, with a mixture of 60% n-butane and 40% propane and a liquid temperature of 0 ° C, the elasticity of saturated vapors of liquefied gas will be 2.5 atm, and for a gas of the same property at -15 ° C - 1.2 at . _g

With a mixture of 80% propane and 20% butane, the elasticity of saturated vapors at the same liquid temperatures will be 3.9 and 2 atm, respectively.

2

During evaporation of the propane-butane mixture, the liquid is enriched as a percentage with a component with lower vapor pressure (fractional evaporation). Because of this, even with the steady-state thermal regime between the environment and the liquid, the vapor pressure in the natural evaporation plants decreases.

Given the physical properties of the mixture of liquefied gases with a high butane content and its fractional evaporation, it is impossible to ensure uninterrupted gas supply during winter conditions in most parts of the country, using cupboard cylinder installations with natural evaporation.

Known installation storage and supply of liquefied household gas, containing attached to the consumer gas cylinder with a valve [1).

However, liquefied petroleum gases have a very high coefficient of volume expansion. Therefore, the cylinders are filled with liquid to approximately 85% of its volume, leaving free space for a possible expansion of the liquid while increasing its

3,757,807

temperature compared to the temperature that had the liquid when filling the cylinder

When using a cylinder indoors, it is especially dangerous to pour more than the allowed dose of liquid into the cylinder. If, when filling it, the gas temperature is low, and the temperature in the kitchen is high enough, the liquid in the overflowing cylinder, expanding, can fill its entire volume and with further expansion it can break the cylinder. This is usually accompanied by ₁₀ gives explosion or fire in the kitchen. At installation of a cylinder on the street overflow of a cylinder is less dangerous. When replacing a cylinder, gas leaks may occur at the points where the communications to the cylinder are connected due to repeated cycles of connections and disconnections, which lead to the integrity of the gaskets. The use of a replaceable cylinder in the kitchen makes it possible for a faulty cylinder or a cylinder with a faulty valve 20 to enter the room to the consumer. The residual odor of the odorant, which has a gas cylinder after filling, reduces the possibility of detecting

gas leaks. The need to deliver a full cylinder to the room creates inconvenience. 25

The aim of the invention is to improve the safety and ease of use of domestic gas with a high content of butane.

This is achieved by the fact that the installation is equipped with an additional heat-insulated gas bottom with a valve installed downward and connected to the main cylinder.

An additional cylinder installed on the street is insulated, its valve is connected to the steam space of the cylinder installed in the room. The cylinder located in the kitchen is stationary, and when gas is consumed they change the cylinder located on the street.

The drawing is a setting gazosnab- ₄₀ zheniya, perspective view.

The installation consists of a cabinet 1, which contains an additional cylinder 2 and a cylinder 3, which is in stock, and a main cylinder 4 located in a room, for example, in the 45th kitchen. _;

In the cabinet 1 is placed a hinged bracket 5, with which one of the cylinders 2 or 3 is installed with the valve down. The bracket 5 contains a case. 6, made of insulating material. The pressure regulator 7 is mounted on the cylinder 4 installed in the room. The cavity of the cylinders 2 and 4 are connected by pipeline 8.

In cabinet 1, valve 9 is installed, with which ₅₅ the cylinder 4 and the cylinder 2 installed in the cabinet are disconnected.

Cylinder 4 is stationary and is not replaced during operation.

four

Cylinders 2 and 3 are replaceable and

as emptying is replaced ,.

The installation works as follows.

⁴ A cylinder filled with liquefied gas is placed in the bracket 5, which is in the reclined state. A hose is connected to the valve of the cylinder 3 by means of a cap nut (not shown in the drawing).

The cylinder 3 is installed in the cabinet with the valve down, opening the valve of the cylinder and checking the tightness of the connection by washing. Next, open the valve of the cylinder 3, and the system is ready for operation.

Opening the valve 9, you can start using bottled gas.

The beginning of the working process is characterized by the opening of the valve in front of the regulator and the ignition of a gas device, such as a gas stove. Starts the flow of gas from the cylinder 4.

Depending on the gas flow rate and the amount of fluid in the cylinder 4, the fluid level in it is set to correspond to the equality of the heat that is drawn and the heat that flows.

Let us designate heat due to evaporation through O _otb . and the incoming heat received from the environment through O _pr if θοτβ. > ^Mrs. D s ^cost in the cylinder cools, the pressure in the cylinder falls and / pressurized fluid from the cylinder 2 is fed into the tank 4. The liquid level in the tank 4 increases, increasing the wetted surface, increasing the inflow of heat. Upon reaching equality Ο _θτ6 = O _{pr the} flow of the liquid phase into the cylinder 4 is terminated.

If _Ob <O „p, then the temperature in the cylinder * 4 increases, and the vapor pressure in it is greater than in cylinder 2. As a result, the vapor from cylinder 4 is sent to cylinder 2 and condenses in the liquid phase of cylinder 2, heating it (so called heating "direct steam").

Due to this phenomenon, as well as the presence of a heat-insulating case, which allows you to keep the temperature of the liquid in the cylinder 2 above the ambient temperature, the vapor pressure in the container 4 ensures the transportation of liquid from the cylinder 2 to the cylinder 4, regardless of the outside temperature.

The proposed installation provides the following advantages over existing installations:

- safety of operation of the cylinder in the room due to the fact that when the cylinder is overflowed on the street, at the place of its filling and with subsequent thermal expansion of the liquid, the system cannot be completely filled with two cylinders with liquid;

5,757,807

6

- safety of operation of the cylinder installed in the room, associated with the stationary position of the latter and the absence of the possibility of gas leakage observed with frequent connections and disconnections of the cylinder;

- safety of operation of the cylinder installed in the room, associated with the stationary position of the latter and the inability of the failed cylinder to enter the room;

- ease of operation, as the reserve cylinder, located in the closet, can be used as a worker, which allows to ensure uninterrupted gas supply;

- ease of use, as the filled-in balloon does not need to be brought into the room.

Claims (1)

Claim The installation of storage and supply of liquefied domestic gas containing a gas cylinder attached to the consumer with a valve is different in that, in order to increase the safety and usability of household gas with a high butane content, it is equipped with an additional heat-insulated gas cylinder installed down and connected with the main balloon.