JP3492388B2 - A relay satellite base for liquefied natural gas shipping - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a relay satellite base for shipping a heat-conditioned liquefied natural gas to a satellite base provided on a consumer side by using a tank lorry. About. 2. Description of the Related Art When transporting heat-conditioned liquefied natural gas (LNG) from a factory to a consumer side, a large number of satellite bases are constructed in a wide area of consumption, and the satellite bases are received from the LNG receiving base. Until then, the piston is transported using a tank lorry. [0003] Therefore, the following problems have arisen. a. Receiving stations are being built on the shore to directly receive what has been transported by LNG tankers, while satellite stations are widely scattered near the consuming area. Therefore, it takes a lot of time and cost to transport the liquefied natural gas that has been thermally adjusted from the receiving terminal to the satellite terminal using the tank lorry. b. When transporting city areas by tank lorry,
There are various driving regulations, and it is becoming difficult to secure this transportation route. c. Thermally adjusted liquefied natural gas is stored in the storage tank at the satellite base, but when BOG is generated due to heat input, the quality changes due to so-called clogging, so it is necessary to ship liquefied gas of stable quality. difficult. An object of the present invention is to reduce the cost of transportation,
The purpose of the present invention is to propose a transit satellite base for liquefied natural gas that solves the problems of transport routes at once. [0005] The constitution of the present invention is as follows. [0006] 1. Provision of a satellite base for relaying along the high or medium pressure trunk line of city gas, and re-liquefaction for re-liquefying the thermally conditioned vaporized gas partially removed from the trunk line at this satellite base for relaying That the device was provided,
A storage tank for storing the liquefied gas reliquefied by the reliquefaction device is provided, and a supercooler is attached to an introduction line for introducing the liquefied gas reliquefied by the reliquefaction device into the storage tank. That a part of the liquefied gas after reliquefaction is taken into the supercooler and vaporized, and the reliquefied gas entering the storage tank is cooled by utilizing the latent heat of vaporization; The gas vaporized in the subcooler is configured to be sent out to the consumption side after the pressure is increased by the compressor, and a heat exchanger is incorporated in the liquid of the storage tank,
A part of the reliquefied gas stored in the storage tank is once taken out of the tank, and is vaporized in the heat exchanger, thereby utilizing the latent heat of vaporization to cool the reliquefied gas in the tank. Wherein the storage tank is provided with a shipping line for a tank lorry, wherein the storage tank is provided with a shipping line for a tank lorry. [0007] A vaporizing facility is constructed adjacent to a receiving base for LNG or the like, and city gas is normally sent from this vaporizing facility at a high pressure via a main line, and passes through a pressure regulating base on the way. In the meantime, the pressure is reduced to a medium pressure and a low pressure and supplied to customers. The relay satellite base of the present invention is constructed along a high-voltage or medium-voltage main line. At this relay satellite base, high-pressure or medium-pressure gas is extracted via an introduction line branched from the main line, and the extracted gas is re-liquefied by a re-liquefaction device and stored in the base. Once stored in the tank. The tank lorry for transportation to the consumer side receives cargo from a shipping line attached to the storage tank and transports the cargo to a satellite base provided on the consumer side. The supercooler attached to the receiving line that receives the reliquefied liquefied natural gas into the storage tank is partially cooled by the subcooler, which is vaporized in the supercooler. Cools the reliquefied gas sent to the tank. Also, when BOG is generated in the storage tank and the tank pressure increases, a part of the reliquefied gas in the tank is introduced into the heat exchanger incorporated in the tank after depressurization, where it is vaporized. The reliquefied gas in the tank is cooled by the latent heat of vaporization. As a result, generation of BOG is suppressed, so that liquefied natural gas with stable calorific value and quality can be shipped to lorries. The gas discharged from the subcooler and the heat exchanger is boosted by the booster and sent to the consumer side. FIG. 1 shows an embodiment of a relay satellite base according to the present invention. 1 is an introduction line branched from the main line, 2 is a reliquefaction device, and 3 is a supercooler attached to a line from the reliquefaction device 2 to the storage tank 4, and is heat-conditioned introduced from the introduction line 1. Is re-liquefied in the re-liquefaction unit 2 and stored in the storage tank 4 via the supercooler 3. 5 is a subcooler 3 and a storage tank 4
Is a subcooling line that branches out a part of the line to take out a part of the reliquefied gas and guides it into the subcooler 3. The reliquefied gas taken out from the subcooling line 5 is subcooled. By vaporizing in the vessel 3, the re-liquefied natural gas being received is self-cooled by the latent heat of vaporization. The vaporized reliquefied gas is boosted by the booster 6 and then sent out from the line 5a to the consuming side. Reference numeral 7 denotes a heat exchanger incorporated in the storage tank 4, and when BOG is generated in the storage tank 4, a part of the reliquefied gas in the storage tank 4 is cooled by a cooling line 8.
And has a function of suppressing the generation of BOG by being vaporized here and cooling the reliquefied gas in the storage tank 4 by the latent heat of vaporization. Reference numeral 9 denotes a shipping line, and loading on the tank lorry is performed by the shipping line 9. The effects of the present invention are as follows. a. A satellite base for relaying is constructed along the main line, and the heat-conditioned gas sent out via the main line is reliquefied, stored at low temperature and low pressure in the base, and loaded into a tank lorry. Therefore, there is no need to transport the piston by tank lorry between the LNG receiving terminal and the relay satellite terminal. As a result, there is no need for any transportation time and cost for carrying out using a tank truck. b. Since there is no need to use a tank lorry to transport pistons between the receiving terminal and the relay satellite terminal, problems on the transportation route can be solved at once. c. Since the generation of BOG is suppressed while cooling the liquefied gas in the storage tank, the liquefied gas with stable calorie and quality can be shipped to the lorry.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an explanatory view of a liquefied gas shipping method and a liquefied gas shipping base according to the present invention. [Description of Signs] 1 Introductory line from main line 2 Reliquefaction device 3 Subcooler 4 Storage tank 5 Supercool line 6 Booster 7 Heat exchanger 8 Cooling line 9 Shipping line

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-3-236589 (JP, A) JP-A-63-199998 (JP, A) JP-A-56-143899 (JP, A) 15781 (JP, B1) (58) Fields investigated (Int. Cl. ⁷ , DB name) F17C 1/00-13/12

Claims (1)

(57) [Claims 1] A relay satellite base is provided along a high- or medium-pressure main line of city gas, and the relay satellite base is partially taken out from the main line. A re-liquefaction device for re-liquefying the heat-conditioned vaporized gas, a storage tank for storing a liquefied gas re-liquefied by the re-liquefaction device, and a re-liquefaction by the re-liquefaction device. A supercooler is attached to an introduction line for introducing the liquefied gas into the storage tank, and a part of the liquefied gas after reliquefaction is taken into the supercooler and vaporized, and the latent heat of vaporization is used. And that the re-liquefied gas that enters the storage tank is configured to be cooled, the gas that has been vaporized in the supercooler is configured to be sent out to the consumer side after being pressurized by the compressor, A heat exchanger is incorporated in the liquid A part of the reliquefied gas stored in the storage tank is once taken out of the tank, and is vaporized in the heat exchanger, thereby utilizing the latent heat of vaporization to cool the reliquefied gas in the tank. Wherein the storage tank is provided with a shipping line for a tank lorry, wherein the storage tank is provided with a shipping line for a tank lorry.