RU2262645C2 - Multi-purpose gas-filling compressor station for automobiles - Google Patents

Abstract

FIELD: gas-filling compressor stations for automobiles.

SUBSTANCE: proposed gas-filling compressor station includes natural gas compression system for filling the automobile reservoirs with natural gas. Part of high-pressure air compressed in compressor is directed through preliminary recuperative heat exchanger. Then gas is additionally cooled in heat exchanger-evaporator by evaporating coolant, Freon or propane for example and is divided into two flows after low-temperature recuperative heat exchanger in vapor compression refrigerating machine. One flow is fed through throttle valve to receiver-separator where finished product-liquefied natural gas- is separated in form of liquid phase and then to storage reservoir and technological reservoir. Second flow after passing the throttle valve is combined with cold vapor escaping from receiver-separator in form of return flow giving cold to direct flow in recuperative heat exchangers and returns to compressor suction end to which vapor of liquefied natural gas is fed from drainage lines of storage reservoir and technological reservoir. Both reservoirs are equipped with individual supercharging systems for supercharging the reservoirs from compressor.

EFFECT: maximum loading of equipment.

2 cl,, 1 dwg

Description

The invention relates to the field of compressor units or systems, as well as to cryogenic technology.

Known technologies for refueling vehicles with compressed natural gas (CNG) at gas-filling compressor stations - CNG / 1, 2 /.

The transfer of vehicles to gas fuel gives a significant economic effect and significantly reduces toxic emissions, thus solving the environmental problems of modern large cities. So, in Russia in the 80s, up to 250 CNG-500 were built to provide 500 gas stations per day at each of them.

Traditional technological schemes of these stations include a set of equipment for supplying network gas, preparing it for compression, compressing to 20.0 bar, gas cooling systems after compression, monitoring, automation, protection, etc.

At the same time, the CNG filling rate associated with the real extent of gasification of vehicles in the country as a whole does not exceed 7-8%, which leads to significant losses associated with inefficient use of equipment and downtime of staff.

The problem can be solved by giving the given stations a universal character, both by obtaining the additional possibility of refueling motor vehicles with them not only CNG, but also with liquefied natural gas (LNG), and creating mini-plants for producing LNG on their basis for sale to outside consumers including heat power engineering, utilities and more.

As the closest analogue, a gas-filling compressor station device is proposed, including a network gas compression system for filling automobile tanks, in which part of the high-pressure gas compressed in the compressor, while reducing gas consumption, for example, at night, is sent to a preliminary recuperative heat exchanger, and then to gas liquefaction unit (3).

The aim of the invention is the creation of a multi-purpose gas-filling compressor station based on CNG filling stations to achieve maximum load of equipment and to ensure the possibility of its use as a universal complex for refueling vehicles with compressed natural gas (CNG), liquefied natural gas (LNG) and LNG shipment to external consumers.

The massive creation of mini-LNG plants based on CNG filling stations throughout the country will make it possible to widely use this new type of fuel - fuel of the 21st century - in the national economic and defense sectors of Russia, as well as create a base for export of LNG to foreign countries.

The essence of the invention lies in the fact that in an auto-gas filling station, which includes a system for compressing network gas for filling automobile tanks, part of the high-pressure gas compressed in the compressor is sent to a preliminary recuperative heat exchanger, after which the gas, unlike the analog, is cooled in the heat exchanger-evaporator boiling refrigerant, for example freon, propane, from an external cooling circuit based on a vapor compression refrigeration machine and after a low-temperature recuperative t The heat exchanger is divided into two flows, one of which is fed through a throttle valve to a separator, where the finished product is separated in the form of a liquid phase - liquefied natural gas (LNG) and then to the storage tank and (or) to the process tank, and the second, Having passed through the throttle valve, it is connected to the cold steam leaving the separator-collector as a return flow, gives off the cold to the direct flow in recuperative heat exchangers and returns to the compressor inlet, where also LNG pairs are supplied from the drain lines a technological tank and a storage tank, both tanks being equipped with individual gas pressurization systems from the compressor.

The station’s storage tank is equipped with a discharge column for LNG shipment to transport tanks, and the technological one has a gas station for filling LNG of vehicles with cryogenic fuel tanks.

Drainage lines from the transport tank and from the refueling columns of vehicles are connected to the compressor inlet.

The technological reservoir serves to ensure the continuity of the operation of the liquefaction unit at the time of filling the transport reservoirs from the storage reservoir, and both the storage reservoir and the technological reservoir are equipped with individual pressurization systems of containers by compressed gas from the compressor.

A schematic diagram of a possible implementation of the proposed gas filling compressor station is shown in the drawing. Auto-gas-filling compressor station includes: compressor (1), preliminary recuperative heat exchanger (2), heat exchanger-evaporator (3), vapor compression refrigeration machine (4), low-temperature recuperative heat exchanger (5), throttle valves (6 and 7), collection separator (8), individual pressurization system of the technological tank (9), individual pressurization system of the storage tank (10), technological tank (11), storage tank (12), refueling ramp for cars with compressed natural gas (13), spare an equalizer for refueling vehicles with liquefied natural gas (14) and a refueling column for shipping liquefied natural gas to third-party consumers (15).

Gas filling compressor station operates as follows:

a portion of the high-pressure gas compressed in the compressor 1 is sent to compressed gas (CNG) automobile refueling ramp 13.

The second part of the high-pressure gas compressed in compressor 1 is sent to the preliminary recuperative heat exchanger 2, it is further cooled in the heat exchanger-evaporator 3 (for example, freon, propane) from the external cooling circuit based on the vapor compression refrigeration machine 4 and, after a low-temperature regenerative heat exchanger 5, is divided into two flows.

One of them is fed through a throttle valve 7 to a collector-separator 8, where the liquid phase of the finished product, LNG, is separated, and then to the process tank 11 and storage tank 12.

The second stream is passed through a throttle valve 6 and connected to the cold steam leaving the collector-separator 8, which is used as a return stream for transferring cold to the direct stream in recuperative heat exchangers 2 and 5, and returned to the compressor inlet 1.

There, at the compressor inlet, also LNG pairs from the drainage lines of technological 11 and stationary 12 tanks are also supplied.

The process tank 11 is equipped with a refueling column 14 for refueling with liquefied natural gas (LNG) of vehicles with cryogenic fuel tanks, and the storage tank 12 is equipped with a refueling column 15 for shipment of LNG to outside consumers.

Both the process tank 11 and the storage tank 12 are supplied with systems 9 and 10 of individual pressurization of the tanks with compressed gas from the compressor 1.

Using the invention will increase the economic efficiency of operating the equipment of existing CNG filling stations, create universal complexes for refueling vehicles with compressed natural gas (CNG), liquefied natural gas (LNG) and ship (LNG) to third-party consumers.

Literature

1. Trushin V.M. Gas equipment and fittings for gas-filled cars (compressed natural gas). - L .: Nedra, 1990, p.30-33.

2. Vasiliev Yu.N., Gritsenko A.I. and Chirikov K.Yu. Gas refueling transport. - M .: Nedra, 1995, p.186, fig. 2.42.

3. A.S. No. 1687859 A1 Gas filling compressor station.

Claims (2)

1. Autogas-filling compressor station, including a compression system for network natural gas for filling automobile tanks, in which part of the high-pressure gas compressed in the compressor is directed to a preliminary recuperative heat exchanger, characterized in that after the preliminary heat exchanger the gas is cooled in a heat exchanger-evaporator with boiling refrigerant, for example freon or propane based on a vapor compression refrigeration machine and after a low-temperature recuperative heat exchanger p is divided into two streams, one of which is fed through a throttle valve to a separator-collector, where the finished product is separated in the form of a liquid phase - liquefied natural gas (LNG) and then to a storage tank and a technological tank, and the second, passing through a throttle valve, it is connected to the cold steam leaving the separator as a return flow, gives off the cold to the direct flow in recuperative heat exchangers and returns to the inlet to the compressor, where LNG pairs from the drainage lines of the storage tank are also supplied the treatment vessel, the two vessel systems are equipped with an individual gas containers supercharging compressor. 2. The station according to claim 1, characterized in that the process tank is equipped with a gas station for refueling LNG vehicles with cryogenic fuel tanks, and the storage tank is equipped with a gas station for shipping LNG to transport tanks.