LNG gasification station equipment

LNG Vaporization, Pressure Regulation and Metering Station Complete Equipment

The complete equipment of LNG (Liquefied Natural Gas) vaporization, pressure regulation and metering station is an integrated system that integrates functions such as unloading, storage, vaporization, pressure regulation, metering and odorization of cryogenic LNG. It is mainly used to convert LNG into gaseous natural gas that meets user requirements, and realize safe, stable and efficient gas supply. The following is a detailed introduction from aspects of functions, structure, technical parameters, application scenarios, safety design and industry trends:

I. Core Functions and Process Flow

Unloading and Storage

LNG in the tank truck is transferred to the cryogenic storage tank (usually a double-layer vacuum insulated structure) via the unloading supercharger. The design pressure of the storage tank can reach 1.6MPa, and the volume range covers 3-20,000 cubic meters, meeting the needs of users of different scales.

Vaporization and Heating

Air-Temperature Vaporizer: Uses air thermal energy to vaporize LNG into gaseous state, with no energy consumption and low operating cost, suitable for areas with relatively high ambient temperature.

Water Bath Type Reheater: In low-temperature environments (e.g., winter), electric heating or hot water circulation is used to reheat the vaporized natural gas, ensuring the outlet temperature is stably above 5℃.

BOG (Boil-Off Gas) Treatment: BOG naturally evaporated in the storage tank is heated by a heater and then merged into the main pipeline to avoid waste.

Pressure Regulation and Metering

Multi-Stage Pressure Regulation: Reduces the pressure from 0.6-1.6MPa to the range required by users (e.g., 3-400kPa) through self-operated pressure regulators or electric pressure regulators, with a pressure regulation accuracy of up to ±5%.

High-Precision Metering: Turbine flowmeters, ultrasonic flowmeters or roots flowmeters are adopted, with a metering accuracy of ±1% and support for temperature-pressure compensation and trade settlement.

Odorization and Control

Tetrahydrothiophene (THT) is added in accordance with national standards (e.g., GB 50028), and the odorization amount can be adjusted precisely. The control system realizes parameter monitoring, remote control and safety interlock through PLC (Programmable Logic Controller) or DCS (Distributed Control System).

II. Equipment Structure and Technical Features

Skid-Mounted Integrated Design

Integrates vaporizers, pressure regulators, flowmeters, valve groups, control cabinets and other components on the same skid. It covers a small area (e.g., the skid length of 5,000Nm³/h capacity equipment is about 12 meters), has a short installation cycle (7-15 days), and can be transported as a whole and reused.

Intelligent Monitoring

Remote Operation: Real-time monitoring of parameters such as pressure, temperature and liquid****** through IoT platforms (e.g., Dingli Cloud System), supporting remote control of valve switching and parameter adjustment via mobile APP or computer terminal.

Automatic Alarm and Interlock: Equipped with combustible gas detectors and overpressure/low-temperature emergency shut-off valves. When parameters are abnormal, it automatically cuts off the gas source and triggers sound and light alarms.

Safety Redundancy Design

Multiple Safety Protections: Equipped with cryogenic liquid phase safety valves, gas phase overpressure shut-off valves, electrostatic grounding and lightning protection devices, complying with GB 50156-2021 Technical Standard for Automobile Refueling and Gas Filling Hydrogen Stations and international standards such as ISO 13686.

Material Selection: Cryogenic pipelines are made of austenitic stainless steel (e.g., 304L), valves and flanges are suitable for low-temperature working conditions of -196℃, and explosion-proof electrical equipment complies with GB 3836 standard.

III. Technical Parameters and Performance Indicators

IV. Application Scenarios

Urban Gas Supply

Serves as a transitional gas source or emergency peak-shaving station in areas not covered by gas pipelines, providing stable gas supply for residential communities, commercial complexes and distributed energy stations.

Industrial Field

Used in boiler transformation projects in industries such as ceramics, printing and dyeing, and metal processing to replace coal and fuel oil and reduce carbon emissions. For example, a ceramic factory adopted a 5,000Nm³/h skid-mounted equipment, achieving an annual CO₂ emission reduction of approximately 12,000 tons.

Transportation Energy

Provides fuel supply for LNG filling stations, heavy-duty trucks and ships, supporting the implementation of the "oil-to-gas" policy.

Distributed Energy

Combines with renewable energy such as photovoltaic and wind power to build a multi-energy complementary system, realizing efficient energy utilization.