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Enamel Steel Tank

Lighthouse Enamel Steel Tank, also known as enamel assembly tank, is made of titanium-alloy steel plates with double-sided enamel plating. They have beautiful appearance, easy cleaning and maintenance, with good performance in wear resistance, corrosion resistance, impact resistance, insulation resistance and static proof; No special anti-corrosion treatment required, life-time is designed at 30 years.
Our factory of enamel steel is the production base in China, the location of birthplace of hot-rolled steel with double-sided enamel. While it’s the largest and most professional supplier for enamel assembly tank in China, with nearly 30 years of experiences in manufacturing enamel steel. Products are enjoying high reputations internationally, being exported to the United States,Russia,Asia and Africa etc.
Specifications of Enamel Steel Plate:
Tank is equipped with the auxiliaries below for a complete reactor:
1.Double-membrane Gas Holder.
Mounted on top of tank as all-in-one solution of biogas production&storage,the outer&inner membranes of gas holder would be fixed tightly by stirrups around tank;
2.Stirring System.
It makes biomass complete contact with microorganism. Three types of stirring methods: Mechanically, Hydraulically and Gas. Among of them,mechanical agitator is the most popular, has three kinds of installation: Vertically,Inclined entering and side entering.
3.Pressure Protector.
To avoid damages for tank and gas holder resulting from too high or too low pressure inside tank;
4.Heating Coils.
Made of Stainless Steel in tube form,it spirals around inside wall of tank. Hot water from CHP or boiler to be used for tank heating through heating coils.And water after heat exchanged would return to CHP or boiler,as a complete water circulation;
5.Three-phase Separator.
It is required for UASB/EGSB/IC types of digesters with feedstock of low solid content, to achieve separations of “gas”, “liquid” and “solid”;
6.Sensors, Monitoring Devices.
According to actual process requirements, liquid level sensor,temperature sensor,ph sensor,gas pressure sensor and leaking alarm can be installed or integrated into the PLC monitoring system together with biogas analyzer,flow meter etc;
7.Insulation Layer.
For projects located in cold area,heat insulation layer would be installed outside of tank,to keep warm and avoid heat leaking,to guarantee the fermentation temperature;
8.Ancillary Equipment:
Feeding system, discharge system, biogas output pipe, the center support, ladder, casing, manhole, lightning rod, electric control cabinet, blower. Etc.
Common Dimensions:


Technology of LIPP tank is originated from German, a kind of unique construction method. When tank erection, a certain width of steel plate is rolled by uncoiler and then delivered to molding machine for further processing into geometric shape as required. Then through the bending machine for bending and seaming to form a 30~40mm width of continuous spiral cord around the outward of tank, this structure plays the role of strengthening the tank. The bending for two different materials is also possible through the above machines.

Characteristics of LIPP tanks:

1.Good overall performance and long life-time
The complete construction process is completed by special machine at project site. The bended and seamed spiral cord is five times thicker than material, greatly enhanced the carrying capacity of tank, so that the tank overall strength, stability and shock resistance are all better than other kinds of tanks. In addition, it uses a particularly good anti-corrosion properties of material, which makes it life-time longer than other tanks.
2.Good airtight performance and wide applications
Bending and seaming of steel plate by special machine to ensure the quality of any part of tank, so its sealing is particularly good, especially suitable for tank type wet anaerobic fermentation in the filed of biogas energy.
3.Short construction period and low cost
LIPP tank is on-site building, tank cover is made on the ground. Line speed of molding&bending can reach 5meters/min, set-up of scaffolding and other auxiliary facilities is not required, so as to make construction period very short. Main material is thin steel plate, its weight is only equivalent to the rebar of reinforced concrete tank, this greatly reduces the cost for tank.
4.Small area occupation and easy management
Unlike other steel tank, LIPP tank can be in different dimensions, its diameter and height can be arbitrarily selected in a large range. The distance between two tanks can be minimized at 500mm, space can be fully used. Due to high automation of tank, if coupled with sensors of temperature, feedstock level,etc. management would become very convenient.

Anaerobic Lagoon

HDPE Enclosed Anaerobic Lagoon type of Digester, membrane material is HDPE(High Density Polyethylene), is a kind of cheap solution for anaerobic fermentation.

Structural features are as follows:

1.This kind of digester is a regular trapezoidal lagoon; Lagoon surface and bottom are rectangular (Surface is large, bottom is small); The trapezoidal slope is designed at generally 30 degrees to 45 Degrees according to actual volume of lagoon.
2.The bottom of lagoon is anti-seepage treated by using HDPE geo-membrane in conformance to USA GRI quality standard and ASTM testing standards. Membrane thickness is mostly at 1.0 mm;
3.The top of lagoon is covered by HDPE geo-membrane with the same standards as above, and a certain volume of space reserved for biogas storage, about 3~4 meters higher above ground level of lagoon when it’s full of biogas. Membrane thickness is mostly at 1.5 mm;
4.Stirring and TS% regulation of feedstock are implemented before fed into lagoon. Wells for pipeline, waste input&output, digestate discharging are distributed around the lagoon. Stirring mechanism,heating devices,pumps,Pipeline,Valves and Connections are embedded underground. Biogas pipe would be fixed on the outer HDPE membrane;
5.The packaged HDPE membrane is rolled with 6~8 meters width, thermowelding process on site to make individual piece of membrane welded together. The foundation of lagoon would pressed tightly, and make sure that no sharp objects to damage the membrane. The top membrane is fixed tightly by using special anchoring devices.

Because of its following characteristics, the HDPE M.E.A.L has been widely spreading internationally, especially in Southeast Asia, South America and Africa:

1.Low construction cost, less investment, average cost per m³ is about US$ 4~10;
2.Construction is simple, convenient with short installation time;
3.Long HRT(Hydraulic Retention Time) and WRT(Waste Retention Time), high COD/BOD removal rate,resulting in clean liquid output;
4.HDPE membrane has good heat absorption performance to cause high gas production, especially for areas with high ambient temperature.
5.Large storage volume, all-in-one solution for fermentation and biogas storage;
6.No limits by the structure, single lagoon volume can be up to 60,000 cubic meters;
7.Low operating costs, low power consumption, simple operation.
Commonly Dimensions:
The above dimensions would be changed without notice and Bigger dimensional lagoons are available.

Floating Soft Digester

The floating cover of digester is made of reinforced PVC membrane or coated fabric. The edges are double-sided welded, crossed by iron wire or plastic tube to be fixed at bottom of digester.
Household type digester is always in the dimensions of diameter 1~3 m with height 1~1.5 m, cylinder or rectangular shaped; Industrial type is 3~4m width, arch height at 1~1.6m and length at 4~15m, single or multiple numbers in parallel.

Characteristics of floating soft digester:

1.Excellent heat absorption
Fermentation temperature is the key factor, at least 15 degree.C required by this technology. This modified membrane could absorb heat from sunshine for improvement of biogas production.
2.Strong pressure resistance
For digester of reinforced PVC membrane, operation pressure could be up to 3 kPa; For PVC coated fabric, it can reach 8 kPa; What’s more that the digester is equipped with pressure protecting mechanism.
3.Good air tightness
The floating cover is hot-welded by multi-functional high frequency welding machine, with perfect performance of air tightness, in line with the requirements of anaerobic fermentation.
4.Perfect stretchability
The reinforced PVC membrane is flexible, enables floating cover to expand about 10% larger.
5.Strong weather appliability
The membrane chose is a kind of modified PVC alloy material, with good stability, can be antifreeze (-25 Degree.C) and anti-exposure(+50 Degree.C). It is also acid&alkali resistance, lightning protection, earthquake resistance and tear resistance. Life-time can reach 12~15 years.
6.Easy operation&maintenance
It is easy to learn and master the complete processes. Short time of training enables worker to achieve a comprehensive grasp how to operate and maintain the whole digester.

Free-standing Gas Holder

Free-standing double-membrane Gas holder,In 3/4 spherical shape, installed on the ground

Main structural features:

1.Bottom membrane. For sealing of the complete gas storage system;
2.Inner membrane. For partition of biogas and air and pressure regulation;
3.Outer membrane. For biogas output under constant-pressure and protection for inner membrane;
4.Electrical control cabinet. For making constant pressure in the room between Inner and outer membrane;
5.Safety protector. For air release when pressure is too high in the room between the inner and outer membrane;
6.Explosion-proof blower. For air pumping;
7.Anchoring device. Including press plate, anchor bolts, etc.;
8.Support device. Including middle bar, support network, seat belts, etc.;
9.Detecting device. Including mirrors, sensors, etc .;

The membrane quality and production process determines the quality and life-time of the entire gas holder. We can provide Germany-made, Belgium-made membrane, or Mainland-made, Taiwan-made membrane, to meet the following features:

2.Strong tensile strength;
3.Anti-corrosion for sulfide etc;
5.Alkalinity Resistance;
6.Good softness;
7.Compound tight, good air tightness.
Parameters Table for Selection
The above are standard dimensions,subject to actual requirements and bigger sized gas holders are available too.

Integrated Gas Holder

Integrated double-membrane Gas holder,mounted on top of digester for ALL-IN-ONE design

Main structural features:

1.Inner membrane. For partition of biogas and air and pressure regulation;
2.Outer membrane. For biogas output under constant-pressure and protection for inner membrane;
3.Electrical control cabinet. For making constant pressure in the room between Inner and outer membrane;
4.Safety protector. For air release when pressure is too high in the room between the inner and outer membrane;
5.Explosion-proof blower. For air pumping;
6.Anchoring device. Including press plate, anchor bolts, etc.;
7.Support device. Including middle bar, support network, seat belts, etc.;
8.Detecting device. Including mirrors, sensors, etc .;

The membrane quality and production process determines the quality and service life-time of the entire gas holder. We can provide Germany-made, Belgium-made membrane, or Mainland-made, Taiwan-made membrane, to meet the following features:

2.Strong tensile strength;
3.Anti-corrosion for sulfide etc;
5.Alkalinity Resistance;
6.Good softness;
7.Compound tight, good air tightness.
Parameters table for Selection:
The above are standard dimensions,subject to actual requirements and bigger sized gas holders are available too.

Biogas Storage Bag


Single-membrane Biogas Bag

Made of reinforced PVC membrane,Thickness 0.6 ~ 1.8 mm available. Individual loading capacity is up to 400 m³ ; Maximum operation pressure is up to 3 KPa.

We accept custom-made orders in accordance with clients’ specific requirements on the total volume and dimensions.

Specifications of PVC composite membrane


Specifications of PVC coated fabric membrane


GasCle System

Our GasCle system is for the pre-treatment of raw biogas from anaerobic reactor, suitable for biogas flow 20 ~ 300 Nm³/hr. The raw biogas from digester always contains saturated water vapor, physical impurities and hydrogen sulfide. These substances should be removed before the utilization of biogas, to avoid damage to generator, burner of boiler and torch or other equipment.

The GasCle system is skid mounted in combination of multiple functional units, or individually installed at project site.


GasCle system has the following modules:

1.Primary filter (optional)
For preliminary removal of physical impurities and saturated water vapor;
2.Desulphurization tank.
For reducing the hydrogen sulfide content in biogas, to meet the requirements of follow-up equipment;
3.Secondary filter.
For Precise removal of physical impurities in the biogas and moisture;
4.Biogas blower
Increasing biogas pressure for transportation and meed the requirement of follow-up equipment for gas intake pressure;
5.Electrical control system
Equipped with VFD(variable frequency drive) and LCD touch screen.
6.Pressure gauge and H2S analyzer(Optional).
7.Pipes, valves and base frame.
GasCle system has the following functions:
Hydrogen sulfide can be reduced to 50ppm or less;
Removal of saturated water vapor;
3.Impurity removal.
Removal of physical impurities and volatile matter of desulphurizer agent;
4.Pressure increasing
Increment could reach 39.8 kPa or even higher;
5.Pressure stabilization
Stabilizing gas outlet pressure at a fixed value to meet the gas intake pressure requirement of the follow-up equipment;
6. Measurement of Pressure and hydrogen sulfide content (optional);
7.Digital display.
Pressure setpoint, gas outlet pressure, motor frequency, motor speed, motor current, output torque, bus voltage, output voltage, power consumption and system operation time would be indicated on the LCD display.

GasPro System

Our GasPro system is for the pre-treatment of landfill gas or desulphurized biogas of other sources, suitable for gas flow 300 ~ 5,000 Nm³/hr, with main functions of dehydration, dehumidification, edulcoration, boosting, pressure-stabilization, thermoregulation, automatic/remote controlling and on-line detecting,etc.

Lighthouse a.Filtration; Physical particles could be observably removed;
b.Multi-stage dehydration could reduce the temperature of gas dew point,as well as the water vapor content;
c.Freezing function for condensation and precipitation of harmful gases;
d.Adjusting gas temperature in proper condition to feed engine;
e.On-line detecting system for measuring gas composition timely(optional);
f.Advanced control system could stabilize the gas outlet pressure and temperature;
g.The gas flow is automatically tracked rooted on the requirements of engine;
h.Equipped with alarms and protections for over-pressure and over-temperature, to ensure safe and reliable operation of system in the long-term;
i.This matched system could make engine runs under condition of fixed thermal value, to improve the stability of engine operation and protect the gas collector.

The technological process of GasPro system:

The landfill gas or other biogas, after cleaned through our GasPro system, could be in a proper condition for the use of generators. The stability of outlet pressure can be realized through the combined effects of automatic control system and blower.

Flow-chart of GasPro system for converting landfill gas:

1.Dehydration, Dehumidification, Edulcoration

The relative humidity of raw landfill gas is 100% to be fed to GasPro system. Through the high efficient primary filter, water spray and physical impurities are removed, water content becomes saturated and dust size less than 50μm, meanwhile the hydrogen sulfide, ammonia and other harmful gases are dissolved in the condensate, to be discharged out of system.
Subsequently, the saturated gas goes into deep cooling system. Its temperature drops down to 10~15 degree.C after cooled in the shell and tube heat exchanger. The moisture, dust and harmful gases can be removed further in the condenser. The relative humidity of gas gets out of condenser could reach 80% or even lower to satisfy the requirement of generator on water content.
The separation of condensate water occurs in the gas-water separator.

2.Pressure increasing, Pressure stabilizing and Thermoregulation

①Pressure increasing
Taking into considering the gas refining, the need of power generation and investment control, commercial solution is the use of roots blower for gas delivery and meeting the requirement of inlet pressure of generator.
②Pressure stabilizing
Roots blower is controlled by frequency converter. The gas pressure signal from outlet of system is fed back to PLC, to regulate the output current of frequency converter, to change the speed of motor of roots blower, by this means to regulate the gas flow in the range of 20 ~ 100%. Not only the manifold pressure can be stabilized, but also the power consumption of system could be regulated in accordance with the load fluctuation, to avoid the rise of power consumption of system.
The cooled gas from condenser goes through roots blower, after that, its temperature would rise naturally. Then flows into air cooler for cooling again. In this way, the gas temperature would be adjusted well to be fed to generator.

3.Secondary Filtration

The final step of GasPro system is the secondary filter. Filter element is stainless steel material, with enough filtrating area. The micro-sized impurities could be effectively removed, to achieve the purpose of fine separation.

4.Automatic Drainage

Condensate water would be generated resulting from the cooling of the pipeline and equipment of GasPro system, and it can be discharged out of system automatically.

5.Automatic Controlling Process

GasPro system uses proframmable controller - PLC control, with functions of data acquisition, on-line detection and alarm. Standard communication interface to be provided in synchronization with the owner’s control system per clients’ requirements, to achieve the purpose of unattended and fully automatic operation:
①A programmable PLC controller for data acquisition and processing;
②With function of remote data transmission;
③Through standard industrial Ethernet to read data when system in operation;
④Site controlling mode at local engineering station by the use of LCD touch screen. Through data transmission to achieve the purpose of remote controlling, eg. start/stop signal;
⑤The use of professional computer for processing of data and signal. Configuration software and past records are stored in the hard risk of computer;
⑥Within authorized scope, engineer could modify the parameter settings of alarm and shutdown.

Dry Desulphurization Tower<