CNG filling station solution

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Summary of CNG filling stations
The main equipment of the CNG filling station is composed of a compressor unit, a metering device, a gas purifying and drying device, a gas storage device, a charging sequence control panel, a gas filling column, and a gas selling machine. According to the different functions, it can be divided into three types: standard station, gas station and gas station.
The standard station takes gas directly from the gas pipeline network, and after a series of processes such as pretreatment system, compression, and storage, the vehicle is refilled by the gas seller.
In addition to the function of the standard station, the CNG refueling station also charges the compressed natural gas into the high-pressure gas transport semi-trailer (semi-trailer) through the air-filling column installed in the station, and transports it to the refueling sub-station to refuel the car. At the same time, as an effective supplement to pipeline gas transmission, in small and medium-sized cities far from the natural gas pipeline, semi-trailer can be used to transport compressed natural gas to the city by road transportation, after pressure-adjusting into the gas pipeline network, to residents and others. Gas users supply gas.
The CNG refueling substation is built in a place where the natural gas pipeline network has not yet arrived, and receives the compressed natural gas transported from the refueling mother station by the semi-trailer. After the storage and compression processes, the CMA is used to refuel the vehicle.
The natural gas filling bottle compressor developed by our company is designed with advanced and reliable components and advanced design methods. The main components (piston ring, gas valve, etc.) use the products of the world famous brand HOERBIGER, which has high efficiency, high reliability, high degree of automation, long life of wearing parts, low vibration, low noise, operation and maintenance. Convenient and other features. The product is mainly used for natural gas compressors for refueling mother stations and substations. The gas supply is from 300Nm/h to 1000Nm/h, the inlet pressure is from 0.05Mpa to 2.0Mpa, and the exhaust pressure is 25Mpa. It can be air-cooled or water-cooled according to customer requirements. The overall structure can be fixed or armored. Can be made into a soundproof cabin.

Dehydration device
Device performance description
The double tower structure can work continuously and continuously output clean and dry gas.
The first step of the drying tower is equipped with a high-efficiency gas-liquid separator. It can effectively filter and separate free liquid (solid) particles entrained in the inlet gas.
The primary tower outlet is equipped with a primary dust filter. With a filtration accuracy of 1 μm, it can effectively remove secondary pollution caused by the detachment of the adsorbent powder during the drying process.
A pressure gauge and a thermometer are placed on the drying tower housing to visually indicate working conditions such as working pressure and regeneration temperature. The upper and lower heads of the casing are provided with a feeding port and a discharge opening for convenient replacement of the adsorbent.
Multi-point temperature sensor monitoring accurately displays and controls the heater outlet, regeneration gas outlet, and cooler outlet temperature. The control parameters are input to the PLC central processor for processing, and the regenerative system is controlled according to a prescribed program. Heater overheat protection switch to avoid dry burning of the heater and protect the life of the electric heating element
The controller panel is set to regenerate the manual mode and the automatic mode, and the manual mode takes precedence.

C N G control system
The control system is based on Siemens PLC programmable controller and has the functions of comprehensive monitoring of power supply, compressor, production environment and process.
Control the power supply, motor starting system and auxiliary electrical equipment; have motor overload, overcurrent protection, etc.; use the AC motor soft start mode for the main motor, start smoothly, no impact on the compressor and the power grid, and the power supply capacity requirements low.
Compressor unit control and protection: Compressor unit control and protection is the core part of this system. Siemens PLC is used to control the monitoring point analog quantity.
Environmental monitoring:
In the compressor room, the concentration of flammable gas is monitored and controlled, and the super-concentration alarm is automatically combined with the fan to ensure the safety of the workplace.
Gas distribution automatic control (imported or domestic manual control): The compressor can deliver gas with automatic priority control for the 髙 and low three groups, and the gas distributor adopts low, medium and high three-level automatic sequence control to achieve reasonable, fast and efficient. Optimize delivery of gas.
Man-machine interface - intuitive control method:
The system design combining Siemens PLC and display can display the monitoring points in the whole process flow chart and process, and has the functions of fault alarm information prompting;
Save a certain number of various types of alarms, shutdown information and data, and you can query the above data at any time.
According to the needs of users, DCS central control system can be selected.
The CNG sequential inflation control panel is a sequential inflation control panel assembled by imported components. The function is to sequentially supply the compressed gas to each independent cylinder in the order of the high pressure bottle group, the medium pressure bottle group, and finally the low pressure bottle group. Inflated.

Gas storage system
The gas storage well is mainly composed of a wellhead, a wellbore, an upper and lower head and a sewage system.
The underground gas storage well adopts unique single-inlet, double-valve double-insurance (one for one) and full-thread stainless steel pipe connection design, which avoids the disadvantages that the owner must discharge natural gas in order to replace the valve during use, especially the wellhead part is used alone. Some three-level connection methods (heads, import and export short sections, short discharge sections) make this product more conducive to use and maintenance, and make users feel economic, convenient and safe.
Main technical parameters and performance indicators of gas storage series products

Gas storage well model	HQ(AG)-CQJ-02-25	HQ(AG)-CQJ-03-25	HQ(AG)-CQJ-04-25
Design life	25 year	25 year	25 year
Work pressure	25Mpa	25Mpa	25Mpa
Single well depth	500m	5 50m	XOOm
Single well water volume	2m3	3m3	4m3
Single well gas storage	500Nm3	750Nm3	1000Nm3
Fatigue cycle number	not less 2.5x104	not less 2.5x104	not less 2.5x104
Well and well spacing	1.5-2m	1.5-2m	1.5-2m
Wellhead height from the ground	300-500m	300-500m	300-500m
Well pipe outer diameter	4> 177.80mm	177.80mm	4> 177.80mm
Well pipe wall thickness	10.36mm	10.36mm	10.36mm
Import and export pipe diameter	022 *25	4>22 025	4>22 025
Sewage outlet pipe diameter	12	4>12	4>12
Wellhead connection	Single entry and exit,double insurance, full thread connection

Gas dispenser
Accurate measurement: DAanfoss CNG special mass flow meter imported from world famous brands is used, which has high measurement accuracy and is not affected by fluid temperature, pressure, viscosity and density.
Safe and reliable: long service life, safe and environmentally friendly.
Advanced technology: automatic metering, according to user requirements, increase manual air filling function.
Beautiful and practical: easy to use, equipped with a cartridge-type air gun.

Measurement accuracy	0.5 CLASS	Overall size	920x450x2000mm, double gun
Repeatability error	0.25%	Maximum working pressure	25Mpa
power supply	220±10%.AC	Fixed work stress	20Mpa
Single measurement range	0~9999.99m3,dollar，x/m3	Intrinsically safe output	5V, 350mA.DC； 12, 300mA.DC
Cumulative measurement range	0~999999.99m3, /m3	Ambient temperature	-20~+40°C
Relative humidity	35%~90%	Machine explosion-proof form	Factory explosion-proof and intrinsically safe
unit of measurement	Gas addition：m3	Explosion-proof mark	Exdib II AT3

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