Biogas Upgrading System by Membrane Separation Decarburization

• Customization: Available
• Methane/CH4 Target Value: 97~99% as Required
• CNG Pressure Output: 20MPa or Other as Required
• Model NO.: ALONG BIOGAS
• Treatment Capacity: 50~10000 Nm3/Hr
• Transport Package: LCL or FCL
• Specification: Complete System
• Trademark: ALONG BIOGAS
• Origin: China
• HS Code: 8486909000
• Production Capacity: 100 Sets/Year

Product Description

After two-stage desulphurization processes, then go through our GasDec system (Membrane Separation) for carbon removal, biogas could be upgraded to make CNG, for vehicle or going into national pipeline network.

The gas quality after upgrading as below:

Item		Quality Index	Comments
High thermal value	MJ/m3	>31.4	In the specific geographical area for vehicle driving, under the highest operation pressure, the water dew point shouldn't be higher than -13 degree.C; When lowest ambient temperature lower than -8 degree.C, the water dew point should be 5 degree.C lower than the lowest temperature.
CO2	%	≤3.0
Total Sulfur	mg/Nm3	≤200
H2S	mg/Nm3	≤15
O2	%	≤0.5

Comments: The above data is subject to clients' actual requirements.


The Flowchart of biogas upgrading system



Procedures of our biogas upgrading system:

1, Primary Filter

The saturated water and partial particles in the raw digester gas are removed through the primary filter;

2, Boosting, Primary desulphurization

The biogas from primary filter is boosted by blower. Then after cooling, the biogas is fed to wet type desulphurization system for primary removal of Hydrogen Sulfide, to make H2S content lower than 200 mg/Nm3;
 

3, Fine desulphurization

The content of Hydrogen Sulfide is made lower than 50 mg/Nm3 through dry type desulphurization system;
 

4, Impurities Removal, Fine Cleaning System

The new dust and impurities in biogas could be removed through the Separator; Then delivered to Fine cleaning system for removals of water and tiny particles in order to protect membrane and guarantee its life-time;

5.  First MS (Membrane Separation)
The high quality compressed biogas goes into the first MS system through gas-distributing pipeline. The exhaust gas could be gathered or discharged into atmosphere;

6.  Secondary MS (Membrane Separation)
The gas out of First-MS goes into Secondary MS system for final decarburization. The exhaust gas would totally return to the inlet of biogas compressor. Thiophane is added into the cleaned gas, after CNG compressor, through dispenser, to be delivered to gas station by tank lorry;

Main equipment list of our upgrading system
1.  Main non-standard equipment

Item	Equipment Name	Specifications	Qty	Comments
1	Primary Filter		1Unit
2	Primary Cooler		1Unit
3	Wet Desulphurization Tower		1Unit
4	Secondary Filter		1Unit
5	Dry Desulphurization Tower		1Unit
6	Separator		1Unit
7	Pregnant Groove		1Unit
8	Regeneration Groove		1Unit
9	Barren Liquor Groove		1Unit
10	Sulfur Froth Groove		1Unit
11	Underground Groove		1Unit
12	Fine Cleaning System		1 Set
13	First MS Assembly		1 Batch	Imported
14	Second MS Assembly		1 Batch	Imported
15	Buffer Tank		1 Unit

2.  Main Operation Equipment List

Item	Equipment Name	Material	QTY	Comments
1	Biogas Blower	Case Iron	2 Units	With back-up Anti-explosion
2	Desulphurization Pump	Case Iron +SS304	2 Units	With back-up Anti-explosion
3	Regeneration Pump	Case Iron +SS304	2 Units	With back-up Anti-explosion
4	Sulfur Froth Pump	Case Iron +SS304	2 Units	With back-up Anti-explosion
5	Supplement Pump	Case Iron +SS304	1 Unit	Anti-explosion
6	Biogas Compressor	Case Iron	1 Unit	Anti-explosion, Variable frequency
7	CNG Compressor	Case Iron	1 Unit	Anti-explosion, Variable frequency
8	Gas Dispenser		1 Unit	Single line, Double nozzles & measuring
9	Gas Odorization		1 Unit

3.  Instruments & controlling

Item	Product Name	QTY	Comments
1	PLC Controlling Cabinet	1 set
2	PLC system	1 set
3	Operator Station	2 units
4	Complete On-line UPS	1 unit
5	Flow-meter	2 units
6	On-line analyzer	2 units
7	Pressure transmitter	1 batch
8	Pressure gauge	1 batch
9	Temperature gauge	1 batch
10	RTD	1 batch
11	Alertor	1 batch
12	Electrical control box	1 batch

Main Monitoring Locations:

Item	Main Equipment	Instrument	Content
1	Primary Filter	Pressure	Pressure, raw biogas
		Temperature	Temp. raw biogas
		Manual monitoring of H2S	H2S content, raw biogas
2	Biogas Blower	Pressure	Outlet pressure, raw biogas
3	Wet Desulphurization Tower	Temperature	Temp. feed gas
		Pressure	Pressure, outlet
		Manual monitoring of H2S	H2S content, feed gas
4	Dry Desulphurization Tower	Temperature	Temp. feed gas
		Pressure	Pressure,feed gas
5	Fine Cleaning System	Manual monitoring of H2S	H2S content, feed gas
		Flow detection	Inlet flow
		Pressure	Pressure,feed gas
6	Pumping	Temperature	Temp. solution
		Pressure	Pressure, pump outlet
7	Compressing (Biogas&CNG compressors)	Temperature monitoring	Temp. compressor overall inlet Temp. compressor inlet Temp. compressor outlet Temp. Compressor overall outlet Temp. lubrication Temp. circulation water
		Pressure monitoring	Pressure. compressor overall inlet Pressure. compressor inlet Pressure. compressor outlet Pressure. Compressor overall outlet Pressure. lubrication Pressure. circulation water
8	Membrane Assembly	Pressure monitoring	Pressure. Inlet Pressure. outlet
		Temperature monitoring	Temp. Inlet Temp. outlet
		Analyzer	CO2 content, product gas CH4 content, product gas
9	Gas Dispenser	Flow	Flow. Inlet Flow. outlet
10	Circulation Water	Pressure monitoring	Pressure. Inlet Pressure. outlet
		Temperature monitoring	Temp. Inlet Temp. outlet
11	Interconnected Controlling		Interconnected controlling of biogas compressor, CNG compressor and circulation water system
12	Other Controlling		Alarm. Methane leakage Alarm. H2S leakage