Stirling system for long-term storage of liquefied gases

 

(57) Abstract:

Closed nitric circuit system for long-term storage of liquefied gases consists of a cryogenic Stirling machine, a check valve, insulated containers with liquid nitrogen and the throttle valve. Each of the circuits precondensation of vapirov liquefied gases consists of a thermally insulated storage tanks for liquefied gas, safety valve, butterfly valve, control valves located respectively before and after the reservoir with liquid nitrogen, and a check valve located at the front of tank for storing liquefied gas. The contours of precondensation have a common condensing coil that is located in the vessel with liquid nitrogen. The use of the invention will improve the efficiency and reduce material costs for the storage and use of liquefied gases. 1 Il.

The invention relates to the field of cryogenic engineering, cryogenic engineering, cryogenic gas refrigerating machines operating on the Stirling cycle, and storage of liquefied gases, such as natural gas.

It is known that for liquefying gases are used in different cycles, for example, by throttling or refrigerating machine, operating on the Stirling cycle, the efficiency of the Stirling cryogenic machines almost 2 times higher in comparison with other systems used for the liquefaction of gases (Osokin I. P. machinery and equipment the cryogenic equipment. M: Light and food industry, 1982, pp. 185-186).

Known for cryogenics that the boiling point of nitrogen corresponds to a temperature of -196oC (77 K) and liquid nitrogen as coolant (Questions of deep cooling. /Sat. articles edited by Professor M. P. Malkov/. Ed.: "Aliens. literature M., 1961, page 43). However, in technologies for the production of liquefied natural gas, liquid nitrogen is not used.

Known technical solutions for the gasification of liquefied gases before they are distributed to consumers using high-pressure pumps (deep cooling. /Sat. articles edited by Professor M. P. Malkov/. Ed.: "Aliens. literature M., 1961, pp. 287-288).

A device of the Dewar for liquid nitrogen vacuum powder insulation (Sokolov, E. J., Brodyansky C. M. Energy basis of transformation of heat and cooling processes: Textbook. manual for schools. - 2nd ed., - M.: Energoizdat, 1981, page 202).

You know,, the number of which depends on many factors: the form of the vessels; types of insulation, etc. (R. B. Scott. The technique of low temperature. Translated under the editorship of Professor M. P. Malkov, M.: Izd. foreign. letters., 1962, page 250). However, the release of flash steam outside storage tanks for liquefied gases has led to the loss of valuable product, or pollution of the environment.

Known gas refrigerating machines "Phillips", working on the reverse Stirling cycle, intended for liquefying air (deep cooling. /Sat. articles edited by Professor M. P. Malkov/. Ed.: "Aliens. literature M. , 1961, page 35). However, before these machines were not used for storage of liquefied natural gas.

A device that implements the re-liquefaction of the evaporated natural gas, comprising a closed nitrogen circuit containing a capacitor with liquid nitrogen and a throttle valve, and a circuit precondensation of vapirov liquefied gases containing heat-insulated tank for storing liquefied gas and condensing element (Patent US N 4843829, CL F 17 C 13/00, 1989). However, this technical solution for precondensation vapor nitrogen is not used high-performance cryogenic Stirling machine.

To achieve this technical result is that the system for long-term storage of liquefied gases, comprising a closed nitrogen circuit containing a capacitor with liquid nitrogen and a throttle valve, and a circuit precondensation of vapirov liquefied gases containing heat-insulated tank for storing liquefied gases and condensing element, equipped with a cryogenic machine Stirling and a check valve located in a closed nitrogen circuit, and additional circuits precondensation of vapirov liquefied gases, each of which consists of a thermally insulated storage tanks for liquefied gases, safety valve, butterfly valve and check valve and the control valves, located respectively before and after the heat-insulated tank with liquid nitrogen, while the contours of precondensation of vapirov liquefied gases are common to all of the condensing element made in the form of a coil located in the vessel with liquid nitrogen.

The introduction of the system for long-term storage of sgig the different contours of precondensation of vapirov liquefied gases with their insulated tanks for storage of liquefied gases, safety, throttle, reverse and control valves, as well as the total for all circuits precondensation of vapirov liquefied gases condensing element made in the form of a coil located in the vessel with liquid nitrogen, allows to obtain a new property, which consists in the condensation of the vapour of liquefied gases, such as natural gas, with its subsequent return to storage tanks for liquefied gas, due to the difference of boiling points when heat exchange with liquid nitrogen liquefaction power consumption cryogenic machines, due to the use of more efficient cycle and the effect of throttling of the gases, and the ability to use the same system for storing liquefied gases in several capacities.

The drawing shows a system for long-term storage of liquefied gases.

The system includes a cryogenic machine Stirling 1, located in a closed nitrogen loop 2, loop precondensation vapour stored liquefied gas 3. Closed nitric circuit 2 through a condenser (not shown) cryogenic Stirling machine 1 includes a non-return valve 4, the insulated container of liquid nitrogen 5 and the throttle valve is anemia liquefied gas 7, the safety valve 8, the throttle valve 9, the control valves 10, 11 are located respectively before and after a heat-insulated container 5, the condensing coil 12 located in the vessel with liquid nitrogen 5, a check valve 13. For connection of other tanks for storage of liquefied gases and their contours precondensation of vapirov provided for connecting control valves 14, 15.

System for long-term storage of liquefied gases is as follows.

Due to external heat gains in the upper part of the vessel 7 is formed steam liquefied gases. These gases must either be removed by the release into the environment, or to preconcentrate with return to tank 7. The first path leads to the loss of liquefied natural gas (expensive product) and significant environmental pollution, which is already unacceptable for modern technologies storage of liquefied gases. To address the conservation of liquefied gas by the second, closed circuit 2 is filled with nitrogen gas with high pressure and capacity 5 liquid nitrogen. If necessary, the condensation of vapour liquefied gases contained in the tank 7, include cryogenic Stirling machine 1, cutting idci nitrogen from the cryogenic condenser Stirling machine 1 is drained through the check valve 4 in insulated container with liquid nitrogen 5, thereby maintain the required level of liquid nitrogen in the vessel 5. In the heat of the flash steam is condensed, and the liquid nitrogen passes into the gaseous phase with high blood pressure. Next, nitrogen gas passes through the throttle valve 6, as a result, the nitrogen pre-cooled, and fed to the condensation in the condenser Stirling refrigerating machine 1. To thermally insulated containers with liquid nitrogen 5 can be connected alternately (or simultaneously) several tanks for storage of liquefied gases 7 with its contours precondensation of flash steam. Each of the circuits 3 works as follows. When a certain pressure activated safety valve 8, which serves as a signal to enable the cryogenic machine 1. As a result of this gaseous vapour high pressure liquefied gases through the pressure relief valve 8 is supplied to the throttle valve 9, through which enters the condensing coil 12 located in the vessel with liquid nitrogen 5, pre-cooled, and then the coil 12 by heat exchange with liquid nitrogen condensed in the liquid phase through the check valve 13 is collected in a tank for storing liquefied gas 7. Reguliruushsim circuit precondensation flash steam through the control valves 14 and 15. After precondensation flash steam and reducing the pressure in the tank 7, the system is switched off until the next cycle of operation.

Sources of information

1. Osokin I. P. machinery and equipment the cryogenic equipment. - M: Light and food industry, 1982, pp. 185-186.

2. Questions of deep cooling. /Sat. articles edited by Professor M. P. Malkov/. Ed.: "Aliens. literature M., 1961, page 43.

3. Questions of deep cooling. /Sat. articles edited by Professor M. P. Malkov/. Ed.: "Aliens. literature M., 1961, pp. 287-288.

4. Sokolov, E. J. , Brodyansky C. M. Energy basis of transformation of heat and cooling processes: Textbook. manual for schools. - 2nd ed., - M.: Energoizdat, 1981, page 202.

5. R. B. Scott. The technique of low temperature. Translated under the editorship of Professor M. P. Malkov, M.: Izd. foreign. letters., 1962, page 250.

6. Questions of deep cooling. /Sat. articles edited by Professor M. P. Malkov/. Ed.: "Aliens. literature M., 1961, page 35.

7. The US patent N 4843829, CL F 17 C 13/00, 1989, the prototype.

System for long-term storage of liquefied gases, comprising a closed nitrogen circuit containing a capacitor with liquid nitrogen and a throttle valve, and a circuit precondensation of vapirov liquefied gases containing teplota the gene machine Stirling and non-return valve, located in a closed nitrogen circuit, and additional circuits precondensation of vapirov liquefied gases, each of which consists of a thermally insulated storage tanks for liquefied gases, safety valve, butterfly valve and check valve, and control valves that are located, respectively, before and after the heat-insulated tank with liquid nitrogen, while the contours of precondensation of vapirov liquefied gases are common to all of the condensing element made in the form of a coil located in the vessel with liquid nitrogen.

 

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Rotary valve // 2120080

Drain device // 2260741

FIELD: cryogenic engineering.

SUBSTANCE: drain device comprises branch pipe mounted in the casing and provided with several coaxial baffles . The spaces between the baffles are interconnected and are connected with the space between the branch pipe and casing. The outlet section of the branch pipe is connected with the casing of a shaped cross-piece and the inner side of the branch pipe and outer side of the shaped cross-piece is provided with an adhesive coating. The nozzle is provided with fastening flange. The inlet section of the casing can be provided with ribs on the outer side, and shaped cross-piece can be made of a cone whose outer angle is 230-250°. The adsorbing coating can be applied on the outer side of the branch pipe.

EFFECT: enhanced reliability.

3 cl, 1 dwg

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