RU132521U1 - Liquefied natural gas regasification system - Google Patents

Abstract

A liquefied natural gas regasification system, including collector-connected liquefied natural gas receiving unit from a tank truck, liquefied natural gas storage and distribution units, a production gas preparation unit, a dispersion unit, a nitrogen storage and preparation unit, characterized in that the liquefied natural gas receiving unit from a tank truck is connected to the storage and delivery units of liquefied natural gas with a production gas preparation unit and a dispersion unit, with each storage and delivery unit with the liquefied natural gas is connected to the production gas preparation unit, to a collector that connects the liquefied natural gas receiving unit from the tank truck to the production gas preparation unit and to a collector that connects the liquefied natural gas reception unit from the tanker to the dispersion unit, and the nitrogen storage and preparation unit connected to a collector connecting the dispersion unit with a unit for receiving liquefied natural gas from a tanker and storage units and issuing liquefied natural gas.

Description

The utility model relates to the field of energy, in particular to the regasification system of liquefied natural gas.

The closest, in terms of the totality of technological units, is the liquefied natural gas (LNG) regasification system set forth in the Safety Rules for the Production, Storage and Issue of Liquefied Natural Gas at Gas Distribution Stations of Main Gas Pipelines (MGS MG) and Automobile Gas-Filling Compressor Stations (AGNKS) ”. - M .: State Unitary Enterprise "Scientific and Technical Center for Safety in Industry of the Gosgortekhnadzor of Russia", 2001.

This system includes an LNG receiving unit from a tanker, LNG storage and delivery units, a production gas preparation unit, a dispersion unit, a nitrogen storage and preparation unit, and an LNG automatic fire extinguishing unit interconnected in a certain technological sequence.

The automatic fire extinguishing unit of liquefied natural gas includes:

- fire hydrants;

- automatic irrigation system for LNG storage tanks;

- stationary fire monitors;

- underground fire tanks;

- pumping units;

- control nodes;

- shut-off and control valves;

- dispensers;

- sirens;

- electrical equipment (control and monitoring).

The principle of operation of the known LNG regasification system is as follows. Liquefied natural gas from a tank truck through a receiving unit is supplied through collectors to stationary vertical tanks for storage and delivery of LNG. Of which LNG for collectors is issued to the consumer, having previously passed the production gas preparation unit, in which it is gasified, warmed up to production temperature and odorized. The generated LNG vapor during its storage or emergency gasification is discharged into the atmosphere through a dispersion unit. Nitrogen gas is used to heat and purge process equipment and communications, which is stored in the nitrogen storage and preparation unit. When a fire occurs on cryogenic tanks, a fire extinguishing unit is used to localize it.

In the case of large emergency LNG spills, when it is impossible to stop GHG access to the center of the fire, it is inappropriate to extinguish burning natural gas. In this case, it is necessary to protect the surrounding objects from the direct effects of the combustion site (thermal radiation, the spread of combustion) by water irrigation.

Water AUPs use water as a fire extinguishing agent, which is sprayed and sprayed at a high speed above the object, creating a water mist, which effectively prevents the combustion process and minimizes property damage.

These water AUPs are equipped with LNG storage and regasification systems.

This LNG regasification system is selected as a prototype.

The prototype and the claimed system have the following common features (technological nodes):

- a unit for receiving liquefied gas from a tank truck;

- LNG storage and delivery units;

- Production gas preparation unit;

- dispersion unit;

-Nitrogen storage and preparation unit.

The known regasification system has the following disadvantages.

Firstly, the complexity of the system, due to the structure of the fire extinguishing unit, containing powerful water automatic installations and other technological equipment.

Secondly, it requires additional energy costs, because The facility must be connected to two independent power sources.

Thirdly, it is necessary to place the system at a great distance from settlements, and therefore it is necessary to lay water supply, road and communications.

The utility model is based on the task of creating a LNG regasification system, in which, due to a different scheme for connecting well-known technological units and eliminating a fire extinguishing unit, to simplify and reduce the cost of the system by reducing energy and water consumption.

The problem is solved in a liquefied natural gas regasification system, including collector-connected liquefied natural gas receiving unit from a tank truck, liquefied natural gas storage and delivery units, production gas preparation unit, dispersion unit, nitrogen storage and preparation unit, so that differences from the prototype, the liquefied natural gas receiving unit from the tank truck is connected to the liquefied natural gas storage and delivery units with a production gas preparation unit and a dispersion unit, At the same time, each unit for storing and issuing liquefied natural gas is connected to a unit for preparing production gas, with a collector that connects the unit for receiving liquefied natural gas from a tank truck with a unit for preparing production gas, and with a collector that connects the unit for receiving liquefied natural gas from a tanker with a dispersion unit and the nitrogen storage and preparation unit is connected to a collector connecting the dispersion unit to the unit for receiving liquefied natural gas from a tank truck and storage and delivery units for liquefied of natural gas.

The LNG regasification system is depicted in the diagram.

The system includes an LNG receiving unit from a tank truck (BPA) 1, LNG storage and delivery units (BHV LNG) 2, 3, 4, a production gas preparation unit 5, a dispersion unit 6, a nitrogen storage and preparation unit 7. The listed units are interconnected by a system collectors 8.

The LNG receiving unit from a tank truck (BPA) 1 is an armature assembly designed to connect a tank truck to a manifold block and includes remote-controlled valves, manually-operated valves, self-acting valves and fire arresters. The LNG receiving unit from the tank truck 1 provides automatic and remote control of the tank truck discharge, facility protection in emergency situations, as well as gas preparation of connecting communications (metal hoses) after they are connected to the tanker and before disconnecting from it.

LNG storage and delivery units (BHV LNG) 2, 3, 4 consist of a cryogenic reservoir and a control and gas treatment unit.

The cryogenic reservoir provides the basic functionality of the unit, including automatic maintenance of pressure of LNG delivery to production evaporators, as well as automatic maintenance of pressure in the tank without issuing LNG to production evaporators.

The control and gas treatment unit connects the cryogenic reservoir to the manifold block and includes remote-controlled valves, manually-operated valves, self-acting valves and flame arresters.

The control and gas treatment unit connects the cryogenic reservoir to the collector block and provides automatic and remote control of the block in various modes, protection of the production facility in emergency situations, as well as gas treatment of the unit’s equipment and communications during repair and repair.

The production gas preparation unit (BPPG) 5, consists of production evaporators and electric heaters with shutoff, safety, purge and drainage fittings, as well as an odorization unit (odorant dosing unit), which is a complete technical device.

The production gas preparation unit provides:

- LNG evaporation, heating the production gas after the production evaporators or vapor phase from the tanks to the production temperature with the subsequent delivery of gas to the consumer line;

- warming up the vapor phase from the tanks to a safe discharge temperature for dispersion in the atmosphere (through the gas discharge unit) during emergency gas discharge from the tank;

- evaporation of LNG and heating the steam to a safe discharge temperature for dispersion in the atmosphere (through the gas discharge unit) during emergency emptying of the tank by evaporation of LNG.

The dispersion unit (BR) 6 consists of candles, atmospheric blower heaters, a nitrogen gas receiver with a shutoff, safety and purge fittings.

Candles are designed to remove the discharge of LNG vapor to sufficient for their safe dispersion in the atmosphere.

Atmospheric blowdown heaters are designed to warm the blowdowns to a safe discharge temperature (not lower than minus 100 ° С) before dispersion in the atmosphere. The heaters are located on the discharge manifold from the bypass safety valve (APC) of the reservoirs, the gas outlet manifold from the reservoirs, and discharge from the drainage manifold.

A nitrogen gas receiver with a set of fittings provides storage of a reserve supply of gaseous nitrogen, which is intended to create a phlegmatizing concentration of nitrogen in the blow-off upon ignition of the discharge at the outlet of the candle.

The nitrogen storage and preparation unit (BHPA) 7 consists of a cold cryogenic gasifier and a nitrogen gas receiver with a shut-off, safety and purge fittings.

The cold cryogenic gasifier provides reception, storage, delivery of liquid nitrogen to the boost evaporator and production evaporator, automatic maintenance of pressure in the delivery line.

A nitrogen gas receiver with a set of fittings provides storage of a reserve supply of gaseous nitrogen intended for powering actuators of a remote control valve and distribution of gaseous nitrogen between nitrogen collectors for supplying pneumatic valves and nitrogen for heating and purging of technological equipment and communications.

The collector system (SC) 8 is designed to transport media between other process units, conduct gas preparation of the collectors, as well as provide fire and explosion safety of the blowers.

The system includes the following collectors:

- LNG supply manifold from BPA to BHV LNG tanks (LNG discharge-loading collector);

- LNG supply manifold from tanks to BPPG production evaporators (LNG to evaporator collector);

- a collector for supplying the vapor phase from the tanks to the BPPG production gas heater (collector “LNG vapor to product”);

- a collector for supplying the vapor phase from the BPC tanks to the dispersion unit (collector “LNG vapor into the atmosphere”);

- a vapor phase supply manifold from reservoir gas discharge valves to a dispersion unit (reservoir PPK collector);

- a collector of warm natural gas for heating and purging (gas treatment) of apparatus and communications of an object (collector of warm gas);

- a collector of gaseous nitrogen for heating and purging (gas preparation) of apparatus and communications of the facility (collector of warm nitrogen);

- drainage collector.

The devices for ensuring fire and explosion safety of blowdowns are nodes of constant supply of nitrogen gas to the manifolds going to the dispersion unit, which ensures a constant inert medium in these collectors and the inability to ignite the discharged gas in the manifold when ignition is initiated from the dynamic action of a gas stream when a safety or shut-off valve is triggered or for another reason.

The principle of operation of the LNG regasification system is as follows. The liquefied natural gas from the tank truck through the intake unit 1 is supplied through collectors 8 to the LNG storage and delivery units 2, 3, 4. Of these, LNG is supplied to the consumer via collectors 8, after passing through the production gas preparation unit 5, in which it is gasified, heated to production temperature and odorized. The generated LNG vapors during its storage or emergency gasification are discharged into the atmosphere through the dispersion unit 6. For the supply of pneumatic valves, heating and purging of technological equipment and communications, nitrogen gas is used, which is stored in the nitrogen storage and preparation unit 7.

In the case of large emergency LNG spills, by placing the LNG storage and delivery units 2, 3, 4 at a distance of at least 34 m from the generatrix of the corresponding block (see diagram), the required fire breaks are provided (PB 08-342-00, table. 1 ... 3 of section 4) and eliminates the need to provide the LNG facility with an equipment irrigation system when a fire occurs at an adjacent technological facility.

The absence of a water irrigation system will reduce the cost of electricity for driving the pumps necessary for the water irrigation system and reduce the cost of the facility, due to the lack of a water irrigation system for tanks.

The overall economic effect is to reduce capital costs for the construction of a system consisting of three LNG tanks with a capacity of 50 m ³ each, by 6.5 million rubles. and operating costs of 0.5 million rubles. while providing the required fire breaks.

Claims (1)

A liquefied natural gas regasification system, including collector-connected liquefied natural gas receiving unit from a tank truck, liquefied natural gas storage and distribution units, a production gas preparation unit, a dispersion unit, a nitrogen storage and preparation unit, characterized in that the liquefied natural gas receiving unit from a tank truck is connected to the storage and delivery units of liquefied natural gas with a production gas preparation unit and a dispersion unit, with each storage and delivery unit with the liquefied natural gas is connected to the production gas preparation unit, to a collector that connects the liquefied natural gas receiving unit from the tank truck to the production gas preparation unit and to a collector that connects the liquefied natural gas reception unit from the tanker to the dispersion unit, and the nitrogen storage and preparation unit connected to a collector connecting the dispersion unit with a unit for receiving liquefied natural gas from a tanker and storage units and issuing liquefied natural gas.

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